Narayan Powertech Pvt. Ltd.

Padra, Vadodara, Gujarat

Narayan manufactures FPI for detecting earth and/or phase faults

Standard features are:

• Potential free connection to short-circuit and earth-fault sensors
• Short-circuit: seven trip currents, see sensor type LK
• Earth-fault: seven trip currents, see sensor type LE
• Four response delays between 40 ms and 300 ms

LED indication:

• Passage of 2nd short-circuit by double blinking
• Indication of permanent earth-faults by double blinking
• Button to test the function of the display unit

Reset function:

• Manual by push-button
• Time: four values between 1 h and 12 h
• Remote reset contacts
• Optional: by recovering auxiliary power supply

Power supply:

• Lithium battery type AA 3.6 V
• Contacts for remote monitoring

Coils

Narayan designs, manufactures and supplies range of rogowski coils with following characteristics

Types: Rigid or Flexiblee:

• mutual inductance:3 - 5 microhenries
• current range (50Hz): < 100mA to > 100kA
• upper frequency limit: 10 - 30 kHz
• lower frequency limit: less than 0.1Hz

Accuracy

Rigid coils have a very stable output and can be calibrated to an accuracy of better than 0.5% using traceable standards. Their output is not affected significantly by the position of the conductor threading the coil.

Flexible Coils can be manufactured for accuracy better than 1%

Special Constructions possible to customer needs

Integrators

• Narayan designs and manufactures integrators for use with any of the flexible or rigid coils except for the 545.
• Normal output: is a voltage which reproduces the current wave-form.
• Sensitivity : the current which gives a 1V output (amps/volt).
• The output is linear up to 5 or 10 V depending on the type.
• Standard sensitivity ranges are:
• 100A, 1kA, 10kA and 100kA for flexible coils; 10A, 100A, 1kA and 10kA for rigid coils.

Sensitivities at any intermediate ranges within these limits possible Integrators matching to individual coils possible

Insulation Level

Up to 36kV; BIL 170 kVp

Outer Encapsulation

Epoxy resin, Cycloaliphatic resin for outdoor use

Mechanical Loads

To customer requirements

Electrical Characteristics

Tested for HV, PD and Impulse with traceable serial numbers

Custom Options (contact us)

Contacts can be copper, Aluminum, Brass and MS (for Insulators and VDI) VDI available with Phase comparator or auxiliary contacts Shrouds, Spouts to customer drawing Special bushings for RMU application

Range capabilities

• LV insulators
• MV insulators for panel applications
• MV insulators for outdoor applications
• LV Bushings
• MV bushings for panel applications
• MV bushings for outdoor applications
• MV wall through bushings
• Assemblies
• Capacitive dividers
• Indicators with or without relays for capacitive dividers
• Spouts and bus bar supports
• Secondary connection plate with through wires or inserts

We can design and manufacture as per customer requirements.

• Epoxy resin cast
• Can be special resin cast for outdoor applications
• System voltage level up to 33kV HSV, 70kV/1 minute BDV, 710kVp
• Continuous temperature withstand capacity from -20Deg C up to + 80 Deg C
• Partial discharge tested with serial number wise results
• Zinc plated steel mounting inserts
• Optional feature of nickel plated or natural finish brass inserts possible
• Optional mounting arrangements possible
• Self extinguishing feature possible
• RoHS compliance possible
• Capacitive with 125/150pF +/-10 or resistive