Narayan Powertech Pvt. Ltd. Padra, Vadodara, Gujarat

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

Narayan has a full range of MV VTs-Indoor as well as Outdoor, outline electrical parameters are as below: Up to 36 kV system voltage application. Primary voltage rating up to 37500 volts Secondary voltage of 100V, 110V, 120 V or custom defined Multi winding VTs up to 3 windings possible, Open delta winding possible Burden value up to 200 VA (IEC 60044, IS 3156) or more. Thermal burden of up to 3kVA possible Accuracy class up to 0.1 for metering (IEC 60044, IS 3156), up to 10P, 15P for 

Different Ratios with primary rating up to 6000 Amps Dead tank or Live tank type Multi ratio with tapings on secondary Special electrical/mechanical/mounting needs possible For up to 40 kA 3 seconds STC rating Secondary Terminals can be brass/copper studs/terminals (8-32/10-32)with hardware housed in IP63 terminal box Primary terminals can be copper rod/bar with metric/unc threads suitable for primary current capacity Insulation level Up to 36 kV; BIL 170kVp Frequency 50 - 60 Hz Outer Encapsulation Aluminum/SS/MS tank housed Thermal Rating up to 2.0 @ 30°C ambient, 1.5 @ 55°C ambient

Metal clad Voltage Transformers are single pole insulated and casted with epoxy resin for indoor application The resin body is covered with a grounded metallic box. The high voltage end of the primary winding can be provided with silicone cone for specific plug in connection. The VTs are suitable for installation in or outside switchgear/panel. The secondary terminals are integrated in resin body and protected with cover. Compact design and less space requirement Safe to touch due to grounded body No maintenance Simple for assembly

Different Ratios with primary rating up to 20000 Amps Can be wound type, bar type or window type Multi ratio with tapings on primary or secondary Special electrical/mechanical/mounting needs possible For up to 40 kA 3 seconds STC rating Secondary Terminals can be brass/copper studs/terminals (8-32/10-32)with hardware Primary terminals can be copper pads/studs with metric/unc threads suitable for primary current capacity Insulation level Up to 36 kV; BIL 170kVp Frequency 50 - 60 Hz Outer Encapsulation Epoxy/Poly-urethane casted Thermal Rating up to 2.0 @ 30°C ambient, 1.5 @ 55°C ambient

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

Narayan has a full range of MV CTs -Indoor as well as Outdoor, outline electrical parameters are as below: Up to 36 kV system voltage application. Primary current rating up to 20,000 Amps. Secondary current rating of 1 Amps, 5 Amps, 0.577 Amps (or any relay feed current value) or custom specified. Multi core CTs up to 5 cores or more. Burden value up to 50 VA (IEC 60044, IS 2705) or more. Accuracy class up to 0.1 for metering (IEC 60044, IS 2705), up to 10P, 15P for relaying/protection (IEC 60044, IS 2705), 0.1 for metering (ANSI C 57.13) and up to C 800 for relaying (ANSI C 57.13). Special accuracy class like class PS (IS 2705)/PX (IEC 60044) with specific values of Vk and Imag., PR Class, TPS, TPX, TPY and TPZ

Specification   Indoor Designs for use in Medium Voltage Switchgear. Outdoor design available on request. 5 kV to 25 kV Class. 60 to 150 kV BIL. Up to 15 kVA Single Phase and Three phase. Vacuum Cast using Epoxy Resin. Horizontal & Vertical Mounting on some Models. Designed to meet ANSI, IEC, IS. Typical applications include MV Switchgear, MV Motor Control & Generator / Transformer Neutral Grounding.

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.

Narayan has a range of Bushing CTs –Indoor- Taped, plastic cased and potted and resin casted as well as Outdoor- SS cased and resin potted and resin casted, outline electrical parameters are as below: Primary current rating up to 20,000 Amps. Secondary current rating of 1 Amps, 2 Amps (for WTI application), 5 Amps, 0.577 Amps (or any relay feed current value) or custom specified Burden value up to 50 VA (IEC 60044, IS 2705) Accuracy class up to 0.1 for metering (IEC 60044, IS 2705), up to 10P, 15P for relaying/protection (IEC 60044, IS 2705), 0.1 for metering (ANSI C 57.13) and up to C 200 for relaying (ANSI C 57.13). Special accuracy class like class PS (IS 2705)/PX (IEC 60044) with specific values of Vk and Imag. Special application CTs like Core balance, Interposing, Summation to specific requirements.

Different Ratios with primary rating up to 20000 Amps Can be wound type, bar type or window type Multi ratio with tapings on secondary Special electrical/mechanical/mounting needs possible For up to 40 kA 3 seconds STC rating Secondary Terminals can be brass/copper studs/terminals (8-32/10-32)with hardware housed in IP63 terminal box Primary terminals can be copper bar with metric/unc threads suitable for primary current capacity Insulation level Up to 36 kV; BIL 170kVp Frequency 50 - 60 Hz Outer Encapsulation Cyc-aliphatic/HECP casted Thermal Rating up to 2.0 @ 30°C ambient, 1.5 @ 55°C ambien

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