High Voltage Potential Transformer · 50kV–245kV

High Voltage Potential Transformer (50kV–245kV)

A High Voltage Potential Transformer — also referred to as a High Voltage Voltage Transformer or HV VT — steps down system voltages from 50kV to 245kV for accurate voltage measurement, protection relaying, and revenue metering across utility substations and transmission networks. As a trusted Potential Transformer Manufacturer, Straton Electricals engineers every high voltage PT with Oil Impregnated Paper insulation and fine-graded bushing construction for uniform voltage stress distribution — designed for demanding outdoor service conditions across India's power infrastructure and fully compliant with IEC 61869-1 & 3.

  • Steps down system voltages from 50kV to 245kV for measurement, protection and revenue metering
  • Oil Impregnated Paper insulation with fine-graded bushing for uniform voltage stress distribution
  • Partial discharge-free performance with nitrogen-free stainless steel bellows for thermal compensation
  • IEC 61869-1 & 3 / IS 16227 type-tested — APTRANSCO & TGTRANSCO approved
High Voltage Potential Transformer (50kV–245kV)

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Certifications

Certified and Approved For

IEC 61869-1 & 3 / IS 16227 Type-Tested IEC 61869-1 & 3 /
IS 16227 Type-Tested
APTRANSCO & TGTRANSCO Approved APTRANSCO &
TGTRANSCO Approved
NABL Accredited Lab NABL
Accredited Lab
ISO 9001:2015
Certified
HV, Lightning Impulse &
PD Testing
Factory Acceptance
Testing (FAT)
Technical Specifications

High Voltage Potential Transformer: Technical Specifications

InstallationOutdoor
DesignInductive Type
InsulationOil-Paper / OIP
Voltage Range50–245kV
Highest System Voltage (Um)72.5kV, 100kV, 123kV, 145kV, 170kV, 245kV
Nominal System Voltage (Un)66kV, 90kV, 110kV, 132kV, 138kV, 150kV, 220kV
Rated Primary VoltageUn/√3
Rated Secondary Voltage110V/√3 (or 110V), 230V as per requirement
Number of Secondaries1 / 2 — Measurement + Protection
Voltage Factor (Vf)Up to 1.9 / 8 Hrs
Accuracy ClassMetering: 0.2 / 0.5 · Protection: 3P (IEC 61869-1 & 3)
Rated Output (Burden)Up to 400 VA per accuracy class
Insulation Level (kV/kVp)140/325, 185/450, 230/550, 275/650, 325/750, 460/1050
Frequency50Hz
InsulatorsPorcelain / Polymeric
Creepage Distance≥ 25mm/kV (longer on request)
Ambient Temperature−10°C to +45°C
Design AltitudeMaximum 1000m (standard); higher altitudes on request
StandardsIEC 61869-1 & IEC 61869-3 / IS 16227 Part 1 & Part 3
Mounting TypePedestal Type
WarrantyUp to 5 Years
DeliveryWithin 3–4 Weeks
Key Features

Key Features of Our High Voltage Potential Transformer (50kV–245kV)

Voltage ratings from 66kV, 110kV, 132kV up to 220kV and 245kV
High accuracy potential transformer design for precise outdoor voltage measurement
Oil Impregnated Paper (OIP) insulation with fine-graded bushing for uniform dielectric strength
Partial discharge-free insulation system for enhanced long-term reliability
Nitrogen-free stainless steel bellows for thermal expansion and oil volume compensation
Precision rated burden secondary outputs to protection relays, revenue meters, and SCADA systems
Available with Polymer or Porcelain external insulation for demanding outdoor environments
Designed for insulation coordination across all transmission voltage levels
Tested in NABL Accredited Laboratory and 700kV High Voltage Test Laboratory
Compliant with IEC 61869-1 & 3 and IS 16227 — fully type tested

In transmission networks and grid infrastructure, Straton Electricals' high voltage metering transformer accurately steps down voltages from 50kV to 245kV into standardised secondary outputs for meters, protective relays, and monitoring instruments. Engineered with Oil Impregnated Paper (OIP) insulation and fine-graded bushing construction, each utility voltage transformer delivers uniform voltage stress distribution and partial discharge-free performance across outdoor service conditions. Nitrogen-free stainless steel bellows compensate for thermal expansion, while Polymer or Porcelain external insulation options ensure robust insulation coordination across India's most demanding air insulated substation environments.

Applications

Applications for High Voltage Potential Transformer

Straton's utility potential transformer and substation voltage transformer range serves as a trusted switchyard voltage transformer and renewable energy PT across every critical power environment — from transmission and distribution networks and outdoor switchyards to relay protection systems and grid synchronization infrastructure.

Transmission & Distribution (T&D) Substations
Outdoor Switchyard Installations
Utility Power Transmission Networks
Renewable Energy Plants (Solar, Wind & Hybrid)
Industrial Power Distribution Systems
Power Generation Plants
Protection Relay & Control Systems
Revenue & Energy Metering
Smart Grid & Grid Synchronization Infrastructure
Grid Monitoring and Power Quality Applications

High Voltage Potential Transformer: Available Voltage Classes

Straton Electricals manufactures Oil Impregnated Paper (OIP) insulated high voltage potential transformers across all major transmission voltage levels — engineered for precision measurement and protection in air insulated substations and grid infrastructure nationwide.

  • 220kV PT — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
  • 132kV PT — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
  • 110kV Voltage Transformer — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
  • 66kV Potential Transformer — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
FAQ

Frequently Asked Questions

They are widely used in transmission substations, utility switchyards, renewable energy plants, GIS and AIS substations, industrial power systems, and grid infrastructure.
High Voltage PTs are commonly available for 66kV, 110kV, 132kV, and 220kV systems, supporting applications up to 245kV.
High Voltage Potential Transformers are generally designed and tested according to IEC 61869-1 & 3 and applicable Indian utility specifications to ensure accuracy, insulation performance, and operational safety.
Selection depends on system voltage, insulation type, accuracy class, burden, installation environment, frequency, and application requirements for metering or protection.
They provide accurate voltage measurement, reliable relay protection, safe isolation of measuring equipment, and stable monitoring of high-voltage power systems, helping utilities maintain grid reliability and operational safety.
Talk To Us

Need a Reliable High Voltage Potential Transformer?

Straton Electricals manufactures high voltage potential transformers from 50kV to 245kV for utility substations and transmission networks. Contact our engineering team for technical support, product selection, and customised specifications.

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Downloads

Download Technical Specifications

Users can download detailed technical documents for product selection and engineering reference.

Technical Datasheet

Full specifications, ratings & drawings Download

GA Drawing

General arrangement drawing Download

Type-Test Summary

Type-test certificate summary Download
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