High Voltage Voltage Transformer · 66kV–245kV

High Voltage Voltage Transformers for 66kV, 69kV, 110kV, 115kV, 132kV, 138kV, 150kV, 154kV, 161kV, 220kV & 245kV Power Systems

IEC 61869-3 & IS 3156 type-tested oil-impregnated paper (OIP) voltage transformers for accurate metering and protection on transmission and distribution substations.

  • Type-tested & approved — ERDA · CPRI · Approved Vendor: APTRANSCO, TGTRANSCO
  • Revenue-grade accuracy — class 0.2/0.5 metering & 3P/6P protection windings
  • Available as electromagnetic (oil-immersed) or capacitor voltage transformer (CVT)
  • Custom-engineered ratios, burdens and insulation levels to your tender spec
High Voltage Voltage Transformers for 66kV, 69kV, 110kV, 115kV, 132kV, 138kV, 150kV, 154kV, 161kV, 220kV & 245kV Power Systems

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Certifications

Certified and Approved For

IEC Compliant Designs
NABL Accredited Lab
ISO 14001:2015
ISO 9001:2015
Technical Specifications

Technical Specifications

Product TypeOil-Immersed High Voltage Voltage Transformer (Electromagnetic or CVT)
Voltage Range66 | 69 | 110 | 115 | 132 | 138 | 150 | 154 | 161 | 220 kV up to 245 kV
Applicable StandardsIEC 61869-1 & IEC 61869-3, IS 3156
Highest System Voltage (Um)72.5 | 123 | 145 kV up to 245 kV
Nominal System Voltage (Un)66 | 110 | 132 kV up to 220 kV
Rated Primary VoltageUn/√3
Rated Secondary Voltage110/√3 V, 110 V (standard); custom on request
Accuracy Classes0.2 | 0.5 | 1 (metering); 3P | 6P (protection)
Burden Ratings25 VA to 200 VA, or customer-specified
Insulation TypeOil Impregnated Paper (OIP)
External InsulationPorcelain or Polymer
Insulation Level140/320kVp, 230/550kVp, 275/650kVp, 460/950kVp
Frequency50Hz / 60Hz
Number of Secondary WindingsUp to 3 (metering + 2 protection)
InstallationOutdoor
Optional FeaturesResidual voltage winding, custom ratios, polymer or porcelain insulators
Product Types

Types of High Voltage Voltage Transformers for 66kV, 69kV, 110kV, 115kV, 132kV, 138kV, 150kV, 154kV, 161kV, 220kV & 245kV Power Systems

Electromagnetic (Oil-Immersed) Voltage Transformer

A conventional electromagnetic VT using an oil-impregnated-paper insulated winding system, offering high accuracy and stable performance across the full voltage range, suited to most substation metering and protection duties.

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Capacitor Voltage Transformer (CVT)

Combines a capacitor divider with an electromagnetic unit — more economical at higher transmission voltages and can double as a coupling capacitor for power-line carrier communication where required.

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Key Features

Key Features of Our High Voltage Voltage Transformers for 66kV, 69kV, 110kV, 115kV, 132kV, 138kV, 150kV, 154kV, 161kV, 220kV & 245kV Power Systems

Voltage ratings from 66 kV up to 245kV, single-phase construction
Metering accuracy class 0.2/0.5, protection class 3P/6P available together on one unit
Designed and tested in compliance with IEC 61869-3 and IS 3156
Ferro-resonance-suppressing circuit design on electromagnetic units
Partial discharge-free insulation system for enhanced reliability
Nitrogen-free stainless-steel bellows for thermal expansion compensation
Available with porcelain or polymer external insulation
Custom secondary winding configuration and burden available
Tested in NABL-accredited laboratories and 700 kV High Voltage Test Laboratory

High voltage VTs step transmission and distribution voltages down to standardised secondary values for meters, protective relays, and monitoring instruments. Straton Electricals manufactures outdoor HV voltage transformers from 66kV to 245kV, engineered with oil-impregnated paper (OIP) insulation and fine-graded bushings for uniform dielectric stress distribution.

Applications

Applications of High Voltage Voltage Transformers for 66kV, 69kV, 110kV, 115kV, 132kV, 138kV, 150kV, 154kV, 161kV, 220kV & 245kV Power Systems

Transmission & Distribution (T&D) Substations
High-Voltage Switchgear (AIS & GIS)
Utility Power Transmission Networks
Renewable Energy Plants (Solar, Wind & Hybrid)
Protection Relay & Control Systems
Revenue & Energy Metering
Power-Line Carrier Communication Coupling (CVT)
Smart Grid Infrastructure

Straton Electricals' substation VTs are engineered to deliver high accuracy, thermal stability, and dependable insulation performance across critical electrical transmission systems. For specialised applications, we also offer customised designs tailored to specific system voltages, burden requirements, protection classes, and installation conditions.

FAQ

Frequently Asked Questions

A High Voltage Voltage Transformer (HVVT) is an instrument transformer that steps down a high transmission or distribution voltage to a standardised secondary value — typically 110/√3 V or 110 V — for safe measurement, metering and protection.
An electromagnetic VT uses a wound insulated core throughout; a Capacitor Voltage Transformer (CVT) uses a capacitor divider stage ahead of a smaller electromagnetic unit, which becomes more economical at higher transmission voltages and can also support power-line carrier communication.
Straton Electricals manufactures outdoor voltage transformers across 66 | 69 | 110 | 115 | 132 | 138 | 150 | 154 | 161 | 220 kV up to 245 kV for substations, utility networks, revenue metering systems, and protection relays.
Metering windings are available in accuracy class 0.2 or 0.5, and protection windings in class 3P or 6P — both can be combined on the same unit for combined metering and protection duty.
Under normal conditions they require minimal maintenance and can operate reliably for up to 30 years. Periodic inspection is still recommended: visual inspection for oil leakage, insulation resistance testing, dielectric and tan delta testing, ratio and polarity verification, and oil analysis (DGA).
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Need Help Selecting the Right High Voltage Voltage Transformer?

Straton Electricals offers customized high voltage voltage transformer solutions for transmission substations, industrial power systems, and utility networks. Contact our engineering team for technical support, product selection, and customised VT specifications.

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Technical Datasheet

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GA Drawing

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Type-Test Summary

CPRI / ERDA type-test certificate summary Download
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