Features Programmable for 1A / 5A relay rating Programmable system rated frequency (50/60Hz) 3 OC + 1 EF + 1 SEF/REF Available in both Low load and normal load configurations Choice of 6 IDMT curves and definite time Trip test facility History of 6 latest faults along with settings Self supervision facility MODBUS open protocol over RS – 485 port MODBUS protocol over RS – 232 port Draw out facility with inbuilt CT shorting Standard dimension – 144mm x 144mm Principle of Operation: The relay measures the line current from each of the line CTs and if the current exceeds the set threshold, then relay extends a trip signal after an operating time. The relay's “operating time” is determined by selecting “definite time” or one of the six “inverse time” characteristics. Input to sensitive earth fault protection can be derived in two ways: Residual current derived from three phase current transformers can be used as an input Out put of core balance current transformer (CBCT) having appropriate characteristics can be used as an input. Input to high impedance restricted earth fault protection will be derived from neutral CT output with external stabilizing resistor. Phase over current, Earth fault, Sensitive earth fault/Restricted earth fault protections features can be made active or inhibit independently. Inhibition of all protection is not possible

Features Programmable for 1A / 5A relay rating 3 OC + 1 EF + 1 SEF/REF Choice of 6 IDMT curves and definite time Trip test facility History of 6 latest faults along with settings Self supervision facility MODBUS open protocol over RS – 485 port MODBUS protocol over RS – 232 port Draw out facility with inbuilt CT shorting Standard dimension – 144mm x 144mm Principle of Operation: The relay measures the line current from each of the line CTs and if the current exceeds the set threshold, then relay extends a trip signal after an operating time. The relay's “operating time” is determined by selecting “definite time” or one of the six “inverse time” characteristics. Input to sensitive earth fault protection can be connected in two ways. First one the residual current derived from three phase current transformers, and second is low output core balance current transformer can be connected. Input to restricted earth fault protection will be derived from neutral CT output with external stabilizing resistor. Phase over current, Earth fault, Sensitive earth fault/Restricted earth fault protections* features can be made active or inhibit independently.

Features Suitable for 1A / 5A relay rating Choice of 5 IDMT curve and definite time Programmable Over current relay or Over current relay with multi shot auto re-close Trip test facility History of 6 latest faults Self supervision facility Independent trip sequence setting (IDMT / Def. time) Breaker status monitoring Standard dimension – 144mm x 144mm Disturbance records (DR) in IEEE COMTRADE format Event Records ( ER ) MODBUS open protocol over RS – 485 port MODBUS protocol over RS – 232 port Draw out facility with inbuilt CT shorting Standard dimension – 144mm x 144mm Principle of Operation: The relay measures the line current from each of the phases and if it exceeds the set threshold, then relayextends a trip signal after an operating time. The relay's operating time is determined by selecting definite time OR one of the five inverse time characteristics. Multi shot auto-re-closer facilitates automation related to closing of a breaker. Auto re-closer functionality can be programmed to provide a maximum of five shots. Dead time starts only when phase or earth fault trip occurs. After an elapse of a time interval equal to dead time, closing command will be extended. The reclaim time timer starts at the instant the dead time timer expires. If, after extending the “breaker close” signal an over current fault was detected before the reclaim time timer reached its terminal count, then the relay understands that the fault in the system is still persisting and the over current relay will issue a trip signal. The relay tries to close the breaker for a maximum of the programmed number of shots beforeit choses to lockout.

Features Software based design Trips on neutral snap Programmable Active / Inhibit facility Programmable Rated voltages Wide range of time delay setting   Principle of Operation: JNV 026 measures and displays 3 phase voltages (R, Y, B phases). It calculates percentage of unbalance voltage and if it exceeds the set unbalance voltage, the relay operates after the elapse of operating time. Under voltage fault will be detected when voltage on any phase is less than the set Under voltage limit, the relay operates after elapse of under voltage operating time. Over voltage fault is detected when voltage on any phase is more than the set Over voltage limit, the relay operates after elapse of over voltage operating time. Neutral snap will be detected when Neutral is disconnected.

Application: JNF 020 Over flux relay is used in power systems in order to protect transformers and generators against insulation failure and core damage due to over heating under prolonged over fluxing condition. It protects the equipment against abnormal V/F ratios due to system disturbance which can occur during starting, load sheding and shut down conditions.   Principle of Operation: Over fluxing of a transformer occurs when its flux density exceeds rated density, it is caused when its V/F ratio is greater than that which the manufacture deems it safe. This of course is the case when it is connected directly to the generator i.e, without benefit of an intervening circuitbreaker and the generator’s excitation system is energized while accelerating to operating speed JNF 020 monitors voltage & frequency ratio, when it exceeds the set value it indicates fault and the output relay operates after a set alarm time delay.

• MOQ 2 Piece(s)
• MOQ2

Features Programmable bus voltages Programmable bus frequencies Programmable phase angle difference between two buses Dead bus Active/Inhibit feature History of 5 latest relay closing details Self Supervision facility Application: JNF 060 is used in power systems in order to prevent interconnection of badly synchronized supplies. Synchro check relay is used in series with a breaker closing circuit and automates the operation of synchronizing two buses.   Principle of Operation: JNF 060 monitors voltage, frequency and phase angle difference of both the buses. If “dead bus” feature is Inhibit and If the voltage, frequency and the phase angle differences are within the pre-set limits, then the N/O contacts of the relay operates indicating synchronization of the buses else the relay does not operate. If “dead bus” feature is Active and if the status of one of the buses (bus-1) is programmed as “dead bus” and the other (bus-2) is considered normal, Then, the relay operates if the voltage on bus-2 is greater than 80% of the rated voltage and the voltage on bus-1 is lesser than a programmable value (30%-80% of the rated voltage). Output relay can be operated either in continuous mode or pulse mode. In continuous mode, the relay N/O contacts operate after a programmable delay and will remain in that condition until either a synchro check fails or h/w or power on reset occurs. In the pulse mode, the relay N/O contacts operate for a short while and gets released after a fixed delay of 150msec.