Prayog Electricals PVT LTD.

Current Transformer (CT)- CAST RESIN

We cover practically all possible combinations of ratios, burdens, accuracy classes and voltages up to and including 36 kV indoor and outdoor (with special Resin) type.

Applicable Standard

TECHNICAL SPECIFICATIONS For CT -CAST RESIN
Reference Standard BIS, IEC, IEEE
Voltage Class Upto 3.6kV / 12kV / 24kV / 36kV
Rated Primary Current Upto 30000A
Rated Secondary Current 5A or 1A
Short Time Current 50 kA
Insulation Class A, B, F, H, C
Burden As Specified by Customer
Metering Accuracy Class 0.2S, 0.2, 0.5S, 0.5, 1.0 & 3.0
Protection Accuracy Class 5P, 10P & 15P
Frequency 50 Hz & 60 Hz

Voltage Transformer (VT/PT)- CAST RESIN

We cover practically all combinations of ratios, burdens, accuracy classes and voltages up to 36kV.

Applicable Standard

TECHNICAL SPECIFICATIONS VT/PT-CAST RESIN
Reference Standard BIS, IEC, IEEE
Voltage Class Upto 36kV
Test Voltage 70kV RMS & 170 kV Peak
Voltage Factor 1.2 Cont. & 1.9 for 8Hrs
Insulation Class F, H
Burden Upto 500VA
Metering Accuracy Class 0.2, 0.5, 1.0 & 3.0
Protection Accuracy Class 3P, 6P
Frequency 50Hz & 60Hz

NGT UPTO 36KV, 500KVA

  • Suitable for systems up to 36kV.
  • Power rating up to 500kVA.
  • Designed as a Neutral Grounding Transformer (NGT).
  • Limits earth fault current and improves system protection.
  • High thermal and dielectric strength.
  • Low maintenance and long service life.
  • Manufactured according to BIS, IEC & IEEE standards.
  • Copper or Aluminium winding options.
  • Indoor and outdoor installation available.
  • Reliable performance under continuous operation.
TECHNICAL SPECIFICATIONS
Reference Standard BIS, IEC, IEEE
Voltage Class 36kV
Test Voltage 70kV RMS & 170kVp upto
Insulation Class F, H
Frequency 50Hz & 60Hz

Winding Set And DT,ET,SAT,UAT, and special Transformer Up To 36KV,30MVA​

  • All Special transformers up to 36kV, 30MVA
    Supports DT, ET, SAT, UAT & Special Transformer applications
    High-efficiency copper/aluminium winding design
    Single & three-phase models with multiple cooling options
    Reliable voltage transformation, grounding, and auxiliary power supply
    IEC, BIS & IS compliance with long service life and low maintenance
TECHNICAL SPECIFICATIONS DT,ET,SAT,UAT
Ratings Upto 30 MVA
Voltage Class 36kV
Frequency 50Hz & 60Hz
No of Phase Single & Three Phase
Cooling AN / AF / ONAN
Vector Group As Per Customers Requirement
Winding Material Aluminum / Copper
Type Strip / Foil / Wire
Tappings OCTC / OCTL / OLTC
Insulation Class A, B, F, H
Applicable Standard IEC 60076 Part-11, 20 BIS 2026
Part-11 ECBC Norms
Protection IP 00, IP 23, IP 54

MULTI SECONDARY TRANSFORMER

  • Supports 12 Pulse to 96 Pulse rectifier configurations.
  • Designed for Rectifier, Electrolyser, and Variable Frequency Drive (VFD) applications.
  • High efficiency with low harmonic distortion.
  • Available in single-phase and three-phase configurations.
  • Custom-designed multiple secondary
  • windings as per customer requirements.
  • Copper or aluminium winding options.
  • Excellent voltage regulation and reliable performance.
  • Robust construction for long service life.
  • Low maintenance and high operational reliability.
  • Manufactured as per BIS, IEC, and IEEE standards.

Reactor: Air Core & Iron Core (GAP)

  • Designed for current limiting, harmonic filtering, and reactive power compensation in power systems.
  • Available in Air Core and Iron Core (Gap) designs with current ratings up to 16,000 A and voltage ratings up to 66 kV.
  • Provides stable inductance with low losses, ensuring reliable performance under varying load conditions.
  • Suitable for capacitor banks, harmonic filters, neutral grounding, and industrial power networks.
  • Engineered with high-grade insulation and robust construction for long service life and low maintenance.
  • Designed in compliance with IEC, BIS & IS standards for safe and dependable operation.
TECHNICAL SPECIFICATIONS
CURRENT RATING Upto 10600 Amp
VOLTAGE CLASS Upto 66kV
FREQUENCY 50Hz & 60Hz
NO OF PHASE Single & Three
COOLING AN/AF
INSTALLATION Indoor / Outdoor
WINDING Aluminium / Copper
MATERIAL Strip / Foil
INSULATION CLASS F & H
APPLICABLE STANDARD IS2026 Part 6 : 2017
& IEC60076 Part 6 : 2007
PROTECTION IP 00

I-SCS With OLTC upto 36KV Class

  • Integrated Smart Compact Substation (i-SCS) with OLTC designed for efficient power distribution up to 36kV and 10MVA.
  • Equipped with On-Load Tap Changer (OLTC) to regulate output voltage without interrupting power supply.
  • Combines transformer, switchgear, protection, and control systems into a compact, space-saving enclosure.
  • Available in single-phase and three-phase configurations with AN/AF cooling options.
  • Provides reliable voltage regulation, enhanced system protection, and uninterrupted power distribution.
  • Designed for indoor and outdoor installation with robust construction and low maintenance requirements.
  • Manufactured in accordance with IEC 60076, BIS 2026 & IS standards for safe and dependable operation.
TECHNICAL SPECIFICATIONS
Ratings Upto 10 MVA
Voltage Class 36kV
Frequency 50Hz & 60Hz
No of Phase Single & Three Phase
Cooling AN/AF/ONAN
Vector Group As Per Customers Requirement
Winding Material Aluminium / Copper
Type Strip / Foil / Wire
Tappings OCTC / OCTL / OLTC
Insulation Class A, B, F, H
Applicable Standard IEC 60076 Part-11, 20 BIS 2026
Part-11 ECBC Norms
Protection IP 00, IP 23, IP 54

ISOLATOR CUBICAL

  • Designed for safe isolation and switching of electrical circuits up to 36kV in medium-voltage power systems.
  • Provides a visible isolation gap to ensure personnel safety during maintenance and servicing.
  • Available in indoor and outdoor metal-clad cubicle designs with manual or motorized operation.
  • Ensures reliable switching, system protection, and uninterrupted operation of substations and industrial networks.
  • Built with high mechanical strength, excellent electrical endurance, and a low-maintenance design for long service life.
  • Manufactured in compliance with IEC, BIS & IS standards, delivering safe, efficient, and dependable performance.

Oil Surge And Gas Operated Relay (Buchholz Relay)

  • Unique proprietary connection bushing to ease out connections at site. It can accommodate 3 switches of NO/NC like Alarm, Trip, Scada signal or 2 switches of change over type.
  • Reliable, time-tested magnetic reed switch of various ratings.
  •  Unique internal design to prevent falls alarm due to air traps on top of the relay.
  • Anti-vibration mounting pads to give high stability against mechanical shocks and vibrations.
TECHNICAL SPECIFICATIONS For Oil Surge OR
Reference Standard BIS, IEC, IEEE
Voltage Class Upto 36kV
Test Voltage 70kV RMS & 170kV Peak
Voltage Factor 1.2 Continuous & 1.9 for 8 Hours
Insulation Class F, H
Burden Upto 500VA
Metering Accuracy Class 0.2, 0.5, 1.0 & 3.0
Protection Accuracy Class 3P, 6P
Frequency 50Hz & 60Hz

High Voltage Test Set (HiPot Tester)

Oil/Liquids Breakdown voltage Test Set (BDV)

Solid State Earth Leakage Relay with CBCT (ELR)

  • Earth Leakage Relays are used to detect potentially dangerous earth leakage fault currents & isolate the load by tripping the relay before they cause any hazard.

Applicable Standard

Technical Specification