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Relays

Our Complete range of products are Microprocessor Based Static ELR 30-3000mA, Microprocessor Based Static ELR1-8A, Earth Fault Relay, Microprocessor Based Static ELR 1-10A and Numerical Digital HT Relay.

Microprocessor Based Digital ELR 30mA-30A

INSTALLATION PROCEDURE FOR EARTH LEAKAGE RELAY CBCT :

  1. Check the sensitivity of Earth Leakage Relay and also the inner diameter of core balance current transformer.
  2. The Serial No. of the ELR and CBCT should match for better performance (the performance shall be guaranteed if the serial no. of the ELR and CBCT are matched).
  3. Check the Auxiliary Supply of ELR and proper Voltage i.e. the rated Auxiliary Voltage.
  4. The ELR have one pair of potential free change over contact for tripping purpose. Use rated current and rated voltage (refer the specification of our product). One pair of change over contact i.e., N/O Contact and N/C Contact can be used depending upon the tripping management.
Specification
  • Frame leakage protection for LT control panels and switchboards
  • Earth leakage protection for feeders
  • Protection for hazardous sensitive environments like oil refineries/chemical platform/pulp industries and general electrical distribution also where drives and soft starters are used.
  • Protection for mining and control engineering
  • Protection for Marine and control engineering
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Microprocessor Based Static ELR 30-3000mA

Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic.

Specification
  • Frame Leakage protection for L.T. Control Panels and switch boards.
  • Earth Leakage protection for Feeders / Motors / Generators / Transformers / Mobile Operating Equipments.
  • Protection for hazardous sensitive environments like Oil Refineries/ Cement Plant/Steel Plant /Chemical Platforms/Pulp industries and General Electrical Distribution.
  • Protection for Mining & Control Engineering
  • Test & Reset Facility for testing healthiness of the relay
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Microprocessor Based Static ELR1-8A

Earth Leakage Current give rise to generation of heat and result in progressive failure ofinsulation, which leads to earth faults sparking flashovers, deterioration of earthing and finallyresults into catastrophic fires which destroys costly equipments, gadgets and precious lives.It is therefore essential to detect earth leakage current well before they cross the thresholdlimits and isolate the circuit in the event of leakages. Conventional over current and shortcircuit protection device are not designed detect earth leakage currents.

Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic.

Specification
  • Consistent reliability with accuracy.
  • Fixed or variable current sensitivity by Dip Switch selection
  • LEDs for visual indication of fault.
  • High Barrier connector at rear for easy termination and safety standards.
  • Tamper proof polycarbonate cover in the front.
  • Test & Reset Facility for testing healthiness of the relay
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Microprocessor Based Digital ELR 300mA-30A

Prok dv's make Earth Leakage Relay (ELR) MPEL series uses the state-of-the-art, Digitalmicroprocessor/micro controller based protection device to detect low level leakage dueto degradation of insulation of phase conductors or high impedance faults.The main featureof Digital microprocessor/microcontroller Earth Leakage Relay (ELR) continuous display ofearth leakage currents of the power system. The unit has immunity to external disturbancelike harmonics and transients.

Specification
  • Microcontroller based compact design
  • Continuous monitoring and display of set value and measured value of leakage current
  • 8 character 2line LCD displays with back lit
  • Test & Reset facility
  • CBCT connection monitoring facility
  • True Rms measurement of leakage current
  • Trip Circuit Failure indication (Optional) Default:Disabled
  • Serial RS 485 communication port with modbus protocol (optional)
  • Fault recording with date and time stampings, max up to 10 Faults (optional)
  • Tropicalised and rugged design
  • External test, reset, fault & healthy indication suitable for mining Application
  • High sensitive leakage current setting (5mA to 1.00A) (MODEL:MPELSPL)
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Earth Fault Relay

PROK DEVICES PVT LTD an ISO 9001-2008 company introduces DIGITAL
MICROPROCESSOR / MICROCONTROLLER BASED IDMT / DEFINITE TIME / INSTANTANEOUS
EARTH FAULT RELAY (EFR).It is a current sensing device which is tropicalised professionally
designed and tested for protection of Generators, Transformers and Feeders. Prok dv's
make DIGITAL MICROPROCESSOR / MICROCONTROLLER BASED IDMT / DEFINITE TIME /
INSTANTANEOUS EARTH FAULT RELAY (EFR) can be employed with various earth fault protective
schemes, which are explained in brief with figures. The magnitude of the earth fault current
depends on the fault impedance and invariably the fault impedance for earth fault is
higher than that for phase faults, hence the earth fault current is low compared to the
phase fault currents. The fault impedance depends on the system parameter and also on
type of earthing. The neutral may be solidly grounded, grounded through resistance or
reactance.

Specification
  • Compact
  • IDMT (4 IEC curves), Definite Time & Instantaneous
  • Wide setting ranges
  • Fully digital acquisition & processing of data
  • Wide operating voltages
  • LCD display of operated current & fault current
  • Rugged and Tropicalized design
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Microprocessor Based Static ELR 1-10A

  • Frame Leakage protection for L.T. Control Panels and switch boards.
  • Earth Leakage protection for Feeders / Motors / Generators / Transformers / MobileOperating Equipments.
  • Protection for hazardous sensitive environments like Oil Refineries/ Cement Plant/SteelPlant /Chemical Platforms/Pulp industries and General Electrical Distribution.
  • Protection for Mining & Control Engineering
Specification
  • Consistent reliability with accuracy.
  • Fixed or variable current sensitivity by Dip Switch selection
  • LEDs for visual indication of fault.
  • High Barrier connector at rear for easy termination and safety standards.
  • Tamper proof polycarbonate cover in the front.
  • Test & Reset Facility for testing healthiness of the relay
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Numerical Digital HT Relay

PDMPPRNEXM series offers a multi functional comprehensive smart protection solution for Feeder, Generator, Motor & Transformer segment.PDMPPRNEXM family of protective relays are advance numrical relays that provide multi protection and monitoring with reliable and fast protection solutions in single unit.

Specification
  • 1A & 5A Programmable rated cur
  • communication
  • 25 Fault records
  • 50 Event records
  • Motor start/stop record
  • Programmable input/output
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Numerical Digital Voltage Relay With USB

PNVNSP range of relays provide reliable and highperformance protection.The PNVNSP is a relay for AC Voltage supervision withuniversal application, it protects the three phase networkagainst over, under voltage, unbalance or earth faults inisolated networks. Beside the pure RMS value measurementof the line voltage the PNVNSP evaluates the symmetricalcomponents (U1, U2 & U0 sequence system). By evaluatingthese components relay PNVNSP can detect the phasesequence, voltage unbalance and earth faults.

Specification
  • Numeric DSP technology based relay.
  • Two Groups of configuration parameter.
  • Off line Trip Test mode
  • Suitable for 50Hz/60Hz
  • Single Phase/Three Phase selection
  • Front IP54 transparent dust cover
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Master Trip Relay

The design of lockout relays is electro-mechanical, hinged armature type.It has been ensured to have consistent electrical & magnetic qualities while designing the Armature, Yoke and the core materials. The coil is wound with wires with high thermal rating to withstand the problems of over heating due to continuousrating. It is also ensured that the coil though rated for the very short time will tolerate the higher burden to ensure the faster operation. The series break contact will ensure the supply is cut off at a very short time of 10 ms breaking the inductive current.

Specification
  • Electro-mechanical design
  • Suitable for tripping, signalling in protection and control systems
  • Consistent and Repeat accuracy
  • High resistance to shock and vibration
  • Flexible user friendly Standardized contacts arrangement
  • Hand reset contacts
  • Hand reset flag indication
  • Compact panel mounting case
  • High speed with positive operation
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Numerical Draw-out

The micro-controller continuously monitors the magnitude of the phase current andthe neutral current .whenever the phase current or the earth current magnitude exceeds thepresent value corresponding line / earth element will pick up and relay will trip after timeinterval calculated by the selected IDMT curves. Whenever the fault level exceeds theselected high set range, the relay will trip for high set, ignoring the selected IDMT curves. Thetimer logic is processed and after comparison with set time schedules, tripping signals areissued accordingly. There are two output relays , each output relay has two change overcontacts either for alarm or tripping. The output relays are programmable.The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which canbe used with modbus protocol for communication purposes.

Specification
  • Three phase, high-set, non-directional Over current relay with instantaneous or definite time function
  • Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics
  • Password protection
  • RS-485 communication port with modbus protocol
  • Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set
  • Consistent repeat accuracy
  • High Drop-off/Pick-up ratio
  • Poly carbonate front cover with external reset switch
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Numerical Draw-out 1 Earth Fault

Relay has modbus protocol with RS 485 port with baud rate 9600bps. Anothermodel is established for special applications with baud rate115kbps.Relay records 99 faultswith date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays areconfigurable Configurable options for enabling & disabling of high-set in both Phase &earth.

PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing

Specification
  • Unique combination o f 50/51/50N/51N in a single gadget
  • Consistent repeat accuracy
  • Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC
  • Low AC burden
  • Definite time curve for both Phase & Earth along with optional user defined curve.
  • Relay test facility with relay trip & without relay trip
  • RS-485 communication port with modbus protocol
  • Enabling /Disabling o f High-Set
  • Membrane key pad for easy operation, dust proof front panel
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Numerical Draw-out 2 Over Current

Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITHEARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR).This is intended for protection application in medium voltage networks. These networks mayhave isolated or resistance impedance earthed or solidly earthed neutral points. Definitetime over current relays are both suited for isolated systems and for use as back up todifferential relays and distance relays. Inverse time relays (over current relays with variousinverse times - current characteristics) are advantageous for interconnected systems andsolidly grounded systems. Another tool for reducing the tripping time for faults near thesource is to use the added instantaneous ( high set ) feature in the numeric relay .if the faultoccurs during the setting of relay , the relay shall operate / trip for the previously selected /default settings.

Specification
  • Three phase , low-set, non - directional Over current relay with inverse definite minimum time (IDMT) or definite time characteristics
  • Three phase, high-set, non-directional Over current relay with instantaneous or definite time function
  • Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics
  • Modular Integrated Draw Out System for field adaptability and tropicalised design (MIDOS)
  • Password protection
  • LED indications for power , pick-up, phase fault trip or Earth Fault trip f or IDMT and Highset
  • Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set
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Microprocessor Based Digital Relay

  • Rated Current 5Amps
  • Trip Level 4 % – 20 % in Steps of 1%
  • Delay 0 – 20 Sec in Steps of 0.1 Sec
  • Sensing Voltage Range 50 – 500V
  • Frequency Range 40 – 60 Hz
  • Auxiliary supply 8 5 ‐ 2 7 5 V AC/DC
  • Out put Relay 2 C/O, 250V, 8A AC 30V, 8A DC
  • Microcontroller based, hence accurate and precise
  • Protection of Generator / Prime movers against reverse power
  • Display of reverse power on the LCD
  • Continuous display of sensing voltage, current, frequency and power factor with lead/lag indication
  • Wide Auxiliary voltage range from 85275V AC/DC
  • Cost effective and highly reliable compact design
  • Test Facility, allowing the user to check the NO and NC contacts of the relay
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Differential Relay

PDTPR series offers a multifunctional comprehensive smart protection solution for Feeder, Generator, Motor & Transformer segment.PDTPR family of protective relays are advance numrical relays that provide multi protection and monitoring with reliable and fast protection solutions in single unit

Specification
  • Three phase differential protection (87) with harmonic restrain
  • Three phase Instantaneous differential protection (87)
  • Event Recorder
  • Fault Recorder
  • DO programmable
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Microprocessor Based Over Voltage Relay 3W

Prok dvs make AC DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDER VOLTAGE (UV)AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) is a microcontroller basedvoltage monitoring and supervision relay for polyphase system. It can monitor bothunder voltage (uv) and over voltage (ov) conditions in the system. Both under voltage(uv)& over voltage(ov) conditions are associated with definite time tripping characteristics. Ithas wide setting range f or OV&UV settings and also wide range of operating time on theoccurrence of fault condition. DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDERVOLTAGE (UV) AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) provideswide range of time delay for healthy resumption of the operating voltage.

Specification
  • Site selectable system voltage
  • Continuous display of the measured voltage parameter
  • 16 character 2 line LCD display with back-lit
  • Accurate reading for balanced and unbalanced load
  • Wide range of auxiliary input for both AC & DC
  • Independent contacts for both Under & Over voltage
  • Self reset & site selectable reset gap
  • Tropicalized design using micro controller & Ideal for industrial environment
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Microprocessor Based Under Voltage Relay

All the line voltages are monitored and sensed simultaneously using three independentscale down potential transducer this low level ac signal is subjected to signal condition, which includes surge suppressors and harmonic filter, filtered signal is fed to the ADC of theindustrial grade pic micro controller, When the sensing voltage level exceeds the user setvalue f or under or over voltage, Digital Microcontroller based definite-time under voltage(uv) and over voltage (ov) relay/line voltage monitor(LVM) gives an output signal in the formof relay change over for tripping/alarming.

Specification
  • Monitoring & Supervision of Under and Over voltage in power generating plants & distribution system
  • To protect Generators & AMF switch boards
  • For protection of synchronous & induction motors
  • For transformer feeder panel
  • Protection for capacitor control panels
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Microprocessor Based Under/Over Voltage Relay 3W

Prok dvs make AC DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDER VOLTAGE (UV)AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) is a microcontroller basedvoltage monitoring and supervision relay for polyphase system. It can monitor bothunder voltage (uv) and over voltage (ov) conditions in the system. Both under voltage(uv)& over voltage(ov) conditions are associated with definite time tripping characteristics. Ithas wide setting range f or OV&UV settings and also wide range of operating time on theoccurrence of fault condition. DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDERVOLTAGE (UV) AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) provideswide range of time delay for healthy resumption of the operating voltage.

Specification
  • Site selectable system voltage
  • Continuous display of the measured voltage parameter
  • 16 character 2 line LCD display with back-lit
  • Accurate reading for balanced and unbalanced load
  • Wide range of auxiliary input for both AC & DC
  • Independent contacts for both Under & Over voltage
  • Self reset & site selectable reset gap
  • Built in fixed instantaneous Under & Over voltage highest trip
  • Tropicalized design using micro controller & Ideal for industrial environment
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Microprocessor Based Under Voltage Relay 4W

  • Monitoring & Supervision of Under and Over voltage in power generating plants &distribution system
  • To protect Generators & AMF switch boards
  • For protection of synchronous & induction motors
  • For transformer feeder panel
  • Protection for capacitor control panels
Specification
  • Site selectable system voltage
  • Continuous display of the measured voltage parameter
  • 16 character 2 line LCD display with back-lit
  • Accurate reading for balanced and unbalanced load
  • Wide range of auxiliary input for both AC & DC
  • Independent contacts for both Under & Over voltage
  • Self reset & site selectable reset gap
  • Built in fixed instantaneous Under & Over voltage highest trip
  • User friendly setting modes using key pads
  • Tropicalized design using micro controller & Ideal for industrial environment
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Microprocessor Based Under/Over Voltage Relay 4W

Prok dvs makeAC Digital Microcontroller Based Definite-Time Under Voltage (UV) and Over Voltage (OV)/ Line Voltage Monitor (LVM)is a microcontroller based voltage monitoring and supervision relay for poly-phase system. It can monitor both under voltage (UV) and over voltage (OV) conditions in the system. Both under voltage (UV) & over voltage (OV) conditions are associated with definite time tripping characteristics. It has wide setting range of operating time on the occurrence of fault condition.

DIGITAL MICROCONTROLLER BASED DEFINITE TIME UNDER VOLTAGE (UV) AND OVER VOLTAGE RELAY/ LINE VOLTAGE MONITOR(LVM)provides wide range of time delay for healthy resumption of the operating voltage.

Specification
  • Site selectable system voltage
  • Continuous display of measured voltage parameter
  • 16 character 2 line LCD display with back-lit
  • Accurate reading for balanced and unbalanced load
  • Wide range of auxiliary input for both AC & DC
  • Independent contacts for both Under & Over voltage
  • Self reset & site selectable reset gap
  • Built in fixed instantaneous Under & Over voltage highest trip
  • User friendly setting modes using key pads
  • Low power consumption
  • Tropicalized design using micro controller & Ideal for industrial environment
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Microprocessor Based Over Voltage Relay 4W

All the line voltages are monitored and sensed simultaneously using three independentscale down potential transducer this low level ac signal is subjected to signal condition, which includes surge suppressors and harmonic filter, filtered signal is fed to the ADC of theindustrial grade pic micro controller, When the sensing voltage level exceeds the user setvalue f or under or over voltage, Digital Microcontroller based definite-time under voltage(uv) and over voltage (ov) relay/line voltage monitor(LVM) gives an output signal in the formof relay change over for tripping/alarming.

Specification
  • Site selectable system voltage
  • Continuous display of the measured voltage parameter
  • 16 character 2 line LCD display with back-lit
  • Accurate reading for balanced and unbalanced load
  • Wide range of auxiliary input for both AC & DC
  • Independent contacts for both Under & Over voltage
  • Self reset & site selectable reset gap
  • Built in fixed instantaneous Under & Over voltage highest trip
  • User friendly setting modes using key pads
  • Low power consumption
  • Tropicalized design using micro controller & Ideal for industrial environment
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Numerical Digital Voltage Relay

Prok dv's Digital Microcontroller Based Numerical IDMT/Definite Time/Instantaneous (lowset/High set) Over Voltage (OV) Under Voltage (UV) Relay with Negative SequenceProtection offer reliable and flexible solutions for the protection of plants and feeders. Itincorporates IDMT characteristics, definite time characteristics and High speed featuresfor Over Voltage (OV) and Under Voltage (UV) settings. User friendly selection features-forover Voltage (OV) and Under Voltage (UV) settings. An Alphanumeric 2 line 16-characters, LCD display with membrane key pads for entering and changing parameters by user.Over Voltage (OV), Under Voltage (UV) relay trip indications are provided using LEDs. TheAux. Supply is provided by switched mode power supply with input voltage either AC orDC with wide range from 85V-275 AC/DC. In case of AC the power supply is designed tooperate from 45Hz to 65Hz.

Specification
  • IDMT & Definite time characteristics
  • Negative phase sequence detection
  • High Pickup/drop off ratio
  • Modular Integrated draw out system
  • Nonvolatile memory for data retention
  • Wide range of system voltages
  • High speed feature for under voltages and over voltages
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LV Voltage Relay

Applications :

  • Protection of Synchronous and induction motor of any HP Rating
  • Protection of Generators, AMF switched Board
  • Transformer Feeder Panel
  • Distribution Boards
  • Voltage Regulators
  • Protection of UPS and Single phase application
Specification
  • User friendly setting Parameters
  • Monitor the line to line voltages continuously
  • Built in on delay and trip delay time settings
  • Field configurable reset gap voltage
  • Direct display of line to line voltages in 3 Phase models
  • Set value of Under Voltage (UV) and Over Voltage (OV) in terms of Set voltage directly
  • Phase fail and phase reversal protection in 3 phase models
  • Indication of faults through LED and LCD
  • Independent potential free output contacts for Under Voltage (UV)/ph. fail , Ph reversal and Over Voltage(OV)
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Numerical Draw-out 1 Over Current

The micro-controller continuously monitors the magnitude of the phase current andthe neutral current .whenever the phase current or the earth current magnitude exceeds thepresent value corresponding line / earth element will pick up and relay will trip after timeinterval calculated by the selected IDMT curves. Whenever the fault level exceeds theselected high set range, the relay will trip for high set, ignoring the selected IDMT curves. Thetimer logic is processed and after comparison with set time schedules, tripping signals areissued accordingly. There are two output relays , each output relay has two change overcontacts either for alarm or tripping. The output relays are programmable.The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which canbe used with modbus protocol for communication purposes.

Specification
  • Trips for default/previously selected curve if the fault occurs during settings of the relay
  • Membrane key pad for easy operation, dust proof front panel
  • Enabling /Disabling o f High-Set
  • RS-485 communication port with modbus protocol
  • Relay test facility with relay trip & without relay trip
  • Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set
  • Consistent repeat accuracy
  • Poly carbonate front cover with external reset switch
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Auxiliary Relay

The PAR type auxiliary relay are voltage operated relaysmainly used in control and alarm circuits.PAR series of relay are available in two basic modelsPAR-H and PAR-S. Auxiliary relay CAR-H is providedwith hand reset contacts. CAR-S is self reset type.PAR series of relays are available in 2-elements & 3-elements model. Each element can be energizedseparately.

Specification
  • Electro-mechanical design
  • Suitable for tripping, signaling in protection and control systems
  • Consistent and Repeat accuracy
  • High resistance to shock and vibration
  • Flexible user friendly standardized contacts arrangement
  • Hand reset or self reset contacts
  • Hand reset ag indication
  • Compact panel mounting case
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Numerical Draw-out 1 Over

The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY(EFR) of KP Series PNA TYPE is extensively used for selective short circuit and earth faultprotection of radial feeders in solidly earthed, resistance earthed or impedance earthedpower systems. It has wide applications in substations & industrial networks.

The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY(EFR) of PNA TYPE can also be used in most application where inverse time, definite timeand instantaneous relays are required. The relay gives selective phase and earth faultprotection in time graded systems for transformers, motor etc. If ensures reliable protectivesystem and clears only the faulted section.

Specification
  • Three phase, high-set, non-directional Over current relay with instantaneous or definite time function
  • Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics
  • Password protection
  • 2 line 16 characters industrial grade LCD with back-lit module for numerical display of setting values and measured values which is user friendly
  • Trips for default/previously selected curve if the fault occurs during settings of the relay
  • Membrane key pad for easy operation, dust proof front panel
  • Enabling /Disabling o f High-Set
  • LED indications for power , pick-up, phase fault trip or Earth Fault trip f or IDMT and Highset
  • RS-485 communication port with modbus protocol
  • Relay test facility with relay trip & without relay trip
  • Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set
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Microprocessor Based Din Mount 10-32A

Prok dvs make Microcontroller Based Motor Protection Relay PD-MMPR-303 uses the state-of-the-art Microcontroller based measurement techniques for providing protection for Motors up-to 75HP. The comprehensive protection features of the relay make it ideal for Motor protection. The heart of the relay is microcontroller based reliable hardware with special algorithms to calculate the tripping time. The relay continuously monitors the Three Phase Currents to build the thermal replica of the Motor. This thermal replica is used to protect the Motor against Thermal over Loads.The Microcontroller Based Motor Protection Relay does not require external Current Transformer (CT) for its operation for within the bandwidth of Im ranges. The three phase R, Y and B cables are made to pass through the CT hole which is in the relay. The built in CTs takes care of stepping down of the Currents to the required level. The stepped down three phase Currents are continuously monitored by the relay to detect any abnormal behavior of the Motor and to make tripping decision.

Specification
  • Accurate and Real Time TRUE RMS measurements
  • Motor Rated Current (Im) Selection by means of Pot meter with markings
  • Earth Fault Setting provided by means of Pot meter with markings
  • Selectable Thermal Trip Time characteristics Class - 10A, 10, 20 & 30
  • I > Thermal over load above105 % of Im - provided through visual led indication
  • Provided the Thermal replica for motor overload condition
  • Continuous monitoring of Motor IDLE/Stop, COLD, WARM, HOT, I> & Various Fault status through visual LED indication
  • Various Models with Current ratings
  • Compact and Reliable
  • Manual TEST / RESET Facility
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Frequency Relay

Generator and captive power plantOver frequency relay applied as backup protection for mechanical over speed devices to avoid damages to prime moverUnder frequency relay applied to protect field winding from excessive current, over regulator from overloadServo controller and invertors

Specification
  • Dedicated microcontroller based
  • Accurate, reliable and tropicalized design
  • Continuous display of the measured frequency
  • User selectable upper frequency and lower frequency limits
  • User selectable trip timings
  • Uses SMPS for Auxiliary power i.e. Wide operating range for Auxiliary input 85-275C AC/DC
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Microprocessor Based Din Mount 30-96A

The Microcontroller Based Motor Protection Relay does not require external Current Transformer (CT) for its operation for within the bandwidth of Im ranges. The three phase R, Y and B cables are made to pass through the CT hole which is in the relay. The built in CTs takes care of stepping down of the Currents to the required level. The stepped down three phase Currents are continuously monitored by the relay to detect any abnormal behavior of the Motor and to make tripping decision.

Specification
  • Accurate and Real Time TRUE RMS measurements
  • Motor Rated Current (Im) Selection by means of Pot meter with markings
  • Earth Fault Setting provided by means of Pot meter with markings
  • Selectable Thermal Trip Time characteristics Class - 10A, 10, 20 & 30
  • I > Thermal over load above105 % of Im - provided through visual led indication
  • Provided the Thermal replica for motor overload condition
  • Continuous monitoring of Motor IDLE/Stop, COLD, WARM, HOT, I> & Various Fault status through visual LED indication
  • Motor protections UB (Unbalance), UC (Under current), LR (Locked rotor), EF (Earth fault) can be enabled or disabled using Dip switch setting
  • Manual TEST / RESET Facility
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Numerical Over Current And Earth Fault Relay

Features :

  • Programmable 1A/5A rated CT input.
  • Three phase over current and earth fault protection
  • Draw out with self-CT shorting.
  • Three phase instantaneous over current protection.
  • Earth overcurrent instantaneous
  • Negative phase sequence protection
  • Protection against broken conductor
  • Trip circuit supervision
  • Harmonic restraint
  • Circuit breaker failure detection
  • Programmable Auto enclosure
  • Fault recording
  • Event recording
  • Programmable matrix for -DO (Digital Out Put) and DI (Digital Input)
  • Relay latching /Non latching (pulsed) -option.
  • Protection blocking
  • Communication - local (USB) and Remote(RS-485)
Specification
  • Prok Devices Pvt ltd Make Numerical overcurrent and earth fault relay offers a compact multifunctional protection relay for Feeder, Motor and Transformers. It is a non-directional relay with IDMT (Inverse Definite Minimum Time), Definite time(DMT) and Instantaneous Trip time characteristics in single unit.
  • Relay has been designed for protecting, controlling and monitoring distribution networks and substations. They can be used as a part of protection scheme for feeder, transformers and generators.
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Numerical Draw-out 3 Over Current

Relay has modbus protocol with RS 485 port with baud rate 9600bps. Anothermodel is established for special applications with baud rate115kbps.Relay records 99 faultswith date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays areconfigurable Configurable options for enabling & disabling of high-set in both Phase &earth.

PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing.

Specification
  • Poly carbonate front cover with external reset switch
  • High Drop-off/Pick-up ratio
  • Consistent repeat accuracy
  • Unique combination o f 50/51/50N/51N in a single gadget
  • Non-Volatile memory for data retention and retrieval in the event of power failure
  • Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC
  • Low AC burden
  • Definite time curve for both Phase & Earth along with optional user defined curve.
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Numerical Draw-out 3 O/C

Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITHEARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR).This is intended for protection application in medium voltage networks. These networks mayhave isolated or resistance impedance earthed or solidly earthed neutral points. Definitetime over current relays are both suited for isolated systems and for use as back up todifferential relays and distance relays. Inverse time relays (over current relays with variousinverse times - current characteristics) are advantageous for interconnected systems andsolidly grounded systems. Another tool for reducing the tripping time for faults near thesource is to use the added instantaneous ( high set ) feature in the numeric relay .if the faultoccurs during the setting of relay , the relay shall operate / trip for the previously selected /default settings.

Specification
  • Three phase , low-set, non - directional Over current relay with inverse definite minimum time (IDMT) or definite time characteristics
  • Three phase, high-set, non-directional Over current relay with instantaneous or definite time function
  • Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics
  • Password protection
  • 2 line 16 characters industrial grade LCD with back-lit module for numerical display of setting values and measured values which is user friendly
  • Enabling /Disabling o f High-Set
  • LED indications for power , pick-up, phase fault trip or Earth Fault trip f or IDMT and Highset
  • RS-485 communication port with modbus protocol
  • Relay test facility with relay trip & without relay trip
  • High Drop-off/Pick-up ratio
  • Consistent repeat accuracy
  • Poly carbonate front cover with external reset switch
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Numerical Draw-out 3

PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing.

Specification
  • Three phase , low-set, non - directional Over current relay with inverse definite minimum time (IDMT) or definite time characteristics
  • Modular Integrated Draw Out System for field adaptability and tropicalised design (MIDOS)
  • RS-485 communication port with modbus protocol
  • Relay test facility with relay trip & without relay trip
  • Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set
  • Definite time curve for both Phase & Earth along with optional user defined curve.
  • Low AC burden
  • Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC
  • Non-Volatile memory for data retention and retrieval in the event of power failure
  • Consistent repeat accuracy
  • High Drop-off/Pick-up ratio
  • Poly carbonate front cover with external reset switch
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DIN Mount

Technical Specifications:

  • Rated System Voltage (Un): 415V AC
  • Tripping characteristic: DMT
  • Model: DMPND
  • Voltage setting range: (1-50) Volts in steps of 1V
  • Trip Time setting range: (1-30) Sec In steps of 1Sec
  • Trip Time when Ph. & Neutral interchanged: 500mS ( Approx)
  • Output Relay: 230VAC 5Amp /24VDC 5Amp
  • Auto Reset provided on Healthy voltage resumption
  • AUX. Voltage: 85-275V AC/DC Universal input, 50-60Hz
  • Display: 8 chars 2 line LCD with backlit
  • LED: For Visual indications of healthy & Trip status.
  • Mounting: Flush mounting
  • Dimensions: FLUSH MOUNTING: 96x96x65 mm (w x h x d) +/- 1mm Tolerance
  • DIN MOUNTING: 79x93x73 mm (l x h x b) +/- 1mm Tolerance
Specification
  • Display of voltage magnitudes, using 8 character 2 line LCD
  • User friendly Setting Parameters through key pad switch
  • Accurate and reliable measurement .of residual voltage.
  • Wide range for Selection of residual voltage
  • User configurable Definite tripping time (DMT)
  • Fast tripping response(
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Microprocessor Based Digital ELR 300mA-30A

The rise of leakage current in Electrical Power Distribution are quite dangerous , resulting in Electrical hazards and catastrophe. Leakage Current are due to deterioration of insulations, negligence of wire man, Bad wiring, Inferior / substandard usage of Electrical Materials , ageing or endurance of Electrical environment . First and foremost importance should be given for the proper earthing of electrical net work-system. Most of the Industries, Commercial establishment and domestic application the earthing of electrical system is ignored and improper maintenance of the same.

The Earth Leakage Current are very low and are sensitive leakage current can be detected by Earth Leakage Relay and core balance current transformer. ELR detects the Leakage Current in the circuit and isolate the power supply by switching off the tripping device (circuit breaker / contactor etc).

Specification
  • Microcontroller based compact design
  • Continuous monitoring and display of set value and measured value of leakage current
  • 8 character 2line LCD displays with back lit
  • Test & Reset facility
  • CBCT connection monitoring facility
  • True Rms measurement of leakage current
  • Trip Circuit Failure indication (Optional) Default:Disabled
  • Serial RS 485 communication port with modbus protocol (optional)
  • Fault recording with date and time stampings, max up to 10 Faults (optional)
  • Tropicalised and rugged design
  • External test, reset, fault & healthy indication suitable for mining Application
  • High sensitive leakage current setting (5mA to 1.00A) (MODEL:MPELSPL)
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Microprocessor Based Digital ELR 300mA-30A

Prok dv's make Earth Leakage Relay (ELR) MPEL series uses the state-of-the-art, Digitalmicroprocessor/micro controller based protection device to detect low level leakage dueto degradation of insulation of phase conductors or high impedance faults.The main featureof Digital microprocessor/microcontroller Earth Leakage Relay (ELR) continuous display ofearth leakage currents of the power system. The unit has immunity to external disturbancelike harmonics and transients.

Prok dv's make Digital microprocessor/microcontroller based Earth Leakage Relays (ELR) withCore Balance Current Transformer (CBCT / ZCT) are used to detect leakage currents inelectrical power systems. ELR transmits a signal to activate the trip coil of theMCCB/ACB/OCB/CONTACTOR in the event of earth leakage resulting in automatic isolationof the load. ELR have been widely used and accepted because of field adaptability andare economic.

Specification
  • Frame leakage protection for LT control panels and switch boards.
  • Earth Leakage protection for Feeders / Motors / Generators / Transformers / Mobile Operating Equipments.
  • Protection for hazardous sensitive environments like Oil Refineries/Cement Plant/Chemical Plant/Steel Plant / Pulp Industries and General Electrical Distribution.
  • Protection for Mining and Control Engineering.
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Microprocessor Based Digital ELR 30mA-30A

Prok dv's make Digital microprocessor/microcontroller based Earth Leakage Relays (ELR) withCore Balance Current Transformer (CBCT / ZCT) are used to detect leakage currents inelectrical power systems. ELR transmits a signal to activate the trip coil of theMCCB/ACB/OCB/CONTACTOR in the event of earth leakage resulting in automatic isolationof the load. ELR have been widely used and accepted because of field adaptability andare economic.Prok dv's make Earth Leakage Relay (ELR) MPEL series uses the state-of-the-art, Digitalmicroprocessor/micro controller based protection device to detect low level leakage dueto degradation of insulation of phase conductors or high impedance faults.The main featureof Digital microprocessor/microcontroller Earth Leakage Relay (ELR) continuous display ofearth leakage currents of the power system. The unit has immunity to external disturbancelike harmonics and transients.

Specification
  • Frame leakage protection for LT control panels and switch boards.
  • 8 character 2 line LCD displays with back-lit.
  • Test & Reset facility.
  • CBCT / ZCT connection monitoring facility.
  • Trip Circuit Failure indication.
  • Immune to harmonics and transients.
  • Tropicalized and rugged design.
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Microprocessor Based Digital EFR

The unit has LCD for displaying the fault current (at the time of tripping) and settingvalues (curves, plug setting & TMS). The LEDs are provided for indicating power ON statusand to indicate IDMT or DEFINITE TIME or INSTANTANEOUS mode operation. Key pads areprovided for easy setting/changing of the parameters.The design is tropicalised andrugged.

Specification
  • Compact
  • IDMT (4 IEC curves), Definite Time & Instantaneous
  • Wide setting ranges
  • Fully digital acquisition & processing of data
  • Wide operating voltages
  • LCD display of operated current & fault current
  • Rugged and Tropicalized design
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LV Voltages

Prok Dvs make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY for protection against undervoltages, over voltages, phase failure, phase reversal and unbalance voltages causeddue to transients such as inductive load switching and commutation voltage spikes etc.Prok Dvs Make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY available in five models i.e. VD-02, VD-03, VD-04, VD-05 and VD-06 for various applications. They are provided with fixed orvariable voltage settings, auto reset, definite time delay fixed or variable settings.

Specification
  • Solid state circuitry
  • Negative Phase sequence voltage detection
  • Definite fixed or variable time delay
  • Low power consumption
  • Auto reset
  • Fail safe system
  • LED indication for healthy and fault indication
  • DIN rail mounting
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STATIC OVER VOLTAGE

Prok Dvs Make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY available in five models i.e. VD-02, VD-03, VD-04, VD-05 and VD-06 for various applications. They are provided with fixed orvariable voltage settings, auto reset, definite time delay fixed or variable settings.

Specification
  • Solid state circuitry
  • Negative Phase sequence voltage detection
  • Definite fixed or variable time delay
  • Low power consumption
  • Auto reset
  • Fail safe system
  • LED indication for healthy and fault indication
  • DIN rail mounting
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DIN Mount - LV Voltage Relay

In motors operating at low loads, failure of any one phase causes over voltages, whichmay cause rupture of insulation leading to motor burn out. Low voltage will causesynchronous motors to come out of synchronism at 75% of rated voltage. Inductionmotors may stop when voltage falls below 70%. Over voltages may occur due todefective voltage regulator, over speeding, caused by sudden drop in load on account ofthis di-electric property deteriorates. In single phase supply low voltage may cause overload on supply cable and thermal damage to insulation of windings.

Specification
  • Solid state circuitry
  • Negative Phase sequence voltage detection
  • Definite fixed or variable time delay
  • Low power consumption
  • Auto reset
  • Fail safe system
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Microprocessor Based Din Mount 20-64A

Prok dvs make Microcontroller Based Motor Protection Relay continuously monitoring Real Time Motor Current of all the Three Phases. When the Motor Current exceeds the set value Im, the relay issues a trip command after the calculated time elapse (Based on selection of trip Class). The relay visually indicating the fault trip status by means of LEDs.Two Set of potential free output changeover contact is provided in the relay C& NC and C& NO for trip circuit .The relay continuously monitors the Currents and using this data it builds Thermal replica of the Motor and monitoring the Thermal status of the Motor. This information is used to protect the Motor against Thermal over Loading.

Specification
  • Over Load Current Setting Range 1.0Amps 96.0Amps in 4 ranges as explained in SL.13
  • Trip Time Characteristics Class -10A, 10, 20 &30 as per IEC 947-4-1(Default: Trip class 20) if none of the trip class selected by means of Dip switch
  • Thermal overload pick up above 105 % of Im indication through blinking of TOL led
  • Provided the Thermal Replica for Motor over load
  • Thermal overload pick up status I> indicated through visual LED indication
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Microprocessor Based,Digital ELR 30mA-3A

Prok dvs brand earth leakage relay MPEL series uses the state of the art microcontroller based protection device to detect low level leakage due to degradation of insulation of phase conductors or high impedance faults.The main feature of MPEL is the continuous display of earth leakage currents of the power system. The unit is immune to external disturbance like harmonics and transients.

Specification
  • Microcontroller based compact design.
  • Continuous monitoring and display of set value and measured value of leakage current
  • 8 character 2line LCD displays with back lit
  • Test & Reset facility
  • CBCT connection monitoring facility
  • True Rms measurement of leakage current
  • Trip Circuit Failure indication (Optional) Default:Disabled
  • Serial RS 485 communication port with modbus protocol (optional)
  • Fault recording with date and time stampings, max up to 10 Faults (optional)
  • Tropicalised and rugged design
  • External test, reset, fault & healthy indication suitable for mining Application
  • High sensitive leakage current setting (5mA to 1.00A) (MODEL:MPELSPL)
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Microprocessor Based Digital ELR 300mA-12A

Earth Leakage Current give rise to generation of heat and result in progressive failure ofinsulation, which leads to earth faults sparking flashovers, deterioration of earthing and finallyresults into catastrophic fires which destroys costly equipments, gadgets and precious lives.It is therefore essential to detect earth leakage current well before they cross the thresholdlimits and isolate the circuit in the event of leakages.

Prok dv's make Digital microprocessor/microcontroller based Earth Leakage Relays (ELR) withCore Balance Current Transformer (CBCT / ZCT) are used to detect leakage currents inelectrical power systems. ELR transmits a signal to activate the trip coil of theMCCB/ACB/OCB/CONTACTOR in the event of earth leakage resulting in automatic isolationof the load. ELR have been widely used and accepted because of field adaptability andare economic.

Specification
  • Digital Microprocessor / Microcontroller based compact design
  • Continuous monitoring and display of set value and measured value of leakage current
  • 8 character 2line LCD displays with back lit
  • Test & Reset facility
  • CBCT connection monitoring facility
  • True Rms measurement of leakage current
  • Trip Circuit Failure indication (Optional) Default:Disabled
  • Serial RS 485 communication port with modbus protocol (optional)
  • Fault recording with date and time stampings, max up to 10 Faults (optional)
  • Tropicalised and rugged design
  • External test, reset, fault & healthy indication suitable for mining Application
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Microprocessor Based Static REFR

The application of powerful microprocessors DIGITAL MICROPROCESSOR BASEDRESTRICTED EARTH FAULT RELAY (REFR) opens a new chapter for power system protectiverelaying. The digital processing of measured values and the ability to perform complexarithmetic and logic operations, give digital protection relays significant performance andflexibility improvements over their traditional analogue counterparts. Additionaladvantages - very small power consumption, adaptability, self-supervision, smallerphysical construction and selectable relay characteristics - all combine to allow theimplementation of accurate and highly reliable protection schemes at a significantlyreduced financial burden.

Specification
  • Microprocessor Based Design
  • Wide Setting Ranges
  • Universal Auxiliary supply 85-275V AC/DC
  • Rugged and Compact Design
  • 8 Character Back-lit LCD
  • Display of Fault current
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LV Voltage

Applications :

  • Protection of Synchronous and induction motor of any HP Rating
  • Protection of Generators, AMF switched Board
  • Transformer Feeder Panel
  • Distribution Boards
  • Voltage Regulators
  • Protection of UPS and Single phase application
Specification
  • User friendly setting Parameters
  • Monitor the line to line voltages continuously
  • Built in on delay and trip delay time settings
  • Field configurable reset gap voltage
  • Direct display of line to line voltages in 3 Phase models
  • Set value of Under Voltage (UV) and Over Voltage (OV) in terms of Set voltage directly
  • Phase fail and phase reversal protection in 3 phase models
  • Indication of faults through LED and LCD
  • Independent potential free output contacts for Under Voltage (UV)/ph. fail , Ph reversal and Over Voltage(OV)
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LV Voltage Relays

In motors operating at low loads, failure of any one phase causes over voltages, whichmay cause rupture of insulation leading to motor burn out. Low voltage will causesynchronous motors to come out of synchronism at 75% of rated voltage. Inductionmotors may stop when voltage falls below 70%. Over voltages may occur due todefective voltage regulator, over speeding, caused by sudden drop in load on account ofthis di-electric property deteriorates. In single phase supply low voltage may cause overload on supply cable and thermal damage to insulation of windings.

Specification
  • Protection of synchronous and induction motors of any HP rating
  • Protection of generators, AMF switch Boards
  • Transformer feeder panel
  • Distribution boards
  • Voltage regulators
  • Protection f or UPS and single phase applications
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DIN Mounts - LV Voltage Relay

Prok Dvs make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY for protection against undervoltages, over voltages, phase failure, phase reversal and unbalance voltages causeddue to transients such as inductive load switching and commutation voltage spikes etc.Prok Dvs Make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY available in five models i.e. VD-02, VD-03, VD-04, VD-05 and VD-06 for various applications. They are provided with fixed orvariable voltage settings, auto reset, definite time delay fixed or variable settings.

Specification
  • Solid state circuitry
  • Negative Phase sequence voltage detection
  • Definite fixed or variable time delay
  • Low power consumption
  • Auto reset
  • Fail safe system
  • LED indication for healthy and fault indication
  • DIN rail mounting
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Static Earth Leakage Relay

Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic.

Specification
  • Frame Leakage protection for L.T. Control Panels and switch boards.
  • Earth Leakage protection for Feeders / Motors / Generators / Transformers / Mobile Operating Equipments.
  • Protection for hazardous sensitive environments like Oil Refineries/ Cement Plant/Steel Plant /Chemical Platforms/Pulp industries and General Electrical Distribution.
  • Protection for Mining & Control Engineering
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Microprocessor Based Static ELR 1-4A

  • Frame Leakage protection for L.T. Control Panels and switch boards.
  • Earth Leakage protection for Feeders / Motors / Generators / Transformers / MobileOperating Equipments.
  • Protection for hazardous sensitive environments like Oil Refineries/ Cement Plant/SteelPlant /Chemical Platforms/Pulp industries and General Electrical Distribution.
  • Protection for Mining & Control Engineering
Specification
  • Consistent reliability with accuracy.
  • Fixed or variable current sensitivity by Dip Switch selection
  • LEDs for visual indication of fault.
  • High Barrier connector at rear for easy termination and safety standards.
  • Tamper proof polycarbonate cover in the front.
  • Test & Reset Facility for testing healthiness of the relay
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Neutral Displacement Relay

Prok Dvs an ISO 9001:2008 Company indigenously develops the power system protection relays and panel meters for power system. P based Zero sequence voltage relays are the state of the art design, to monitor and protect the costly equipments against unbalance voltages.The Relay Continuously monitoring all the three phase Line to Line Voltages, if any abnormal condition persists in the system internal Relay activated with predetermined set value of definite time.The Unit Displays Line to Line Voltages on LCD display, Healthy and Fault /Trip status Information through LED Display.

Specification
  • Accurate and reliable measurement .of residual voltage.
  • Display of voltage magnitudes, using 8 character 2 line LCD
  • User friendly Setting Parameters through key pad switch
  • Wide range for Selection of residual voltage
  • User configurable Definite tripping time (DMT)
  • Fast tripping response(
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  • Prok Devices Private Limited (Prok Devices Private Limited)
  • B-80, 2nd & 3rd floor, Rajajinagar Industrial Estate (KSSIDC),4th Main Road, Rajajinagar 6th Block, Bengaluru, Bangalore, Karnataka - 560010
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