High Voltage Instrument Transformer · 50kV–245kV

High Voltage Instrument Transformers (50kV–245kV)

STRATON Electricals is a leading high-voltage instrument transformer manufacturer in India, specializing in Current Transformers (CTs) and Voltage Transformers (VTs/PTs) for indoor and outdoor applications up to 245 kV, including 66 kV, 69 kV, 110 kV, 115 kV, 132 kV, 138 kV, 50 kV, 154 kV, 161 kV, 220 kV. Designed in accordance with IEC standards, our oil-impregnated instrument transformers deliver accurate metering and protection.

  • Enhanced safety & electrical isolation through robust insulation systems
  • Superior measurement accuracy for revenue metering and monitoring
  • Advanced fault detection & protection for grid stability
  • Reduced maintenance & cost-effective, lower total cost of ownership
High Voltage Instrument Transformers (50kV–245kV)
High Voltage Instrument Transformers (50kV–245kV)
High Voltage Instrument Transformers (50kV–245kV)

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Certifications

Certified and Approved For

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

High Voltage Instrument Transformers: Technical Specifications

Product TypeOil-Impregnated High Voltage Current & Voltage Transformer
Voltage Range66 | 69 | 110 | 115 | 132 | 138 | 150 | 154 | 161 | 220 kV up to 245 kV
Applicable StandardsIEC 61869-1, IEC 61869-2 & IEC 61869-3, IS 16227
Insulation TypeOil Impregnated Paper (OIP)
External InsulationPorcelain or Polymer
Frequency50Hz / 60Hz
InstallationIndoor / Outdoor
Accuracy Classes0.2S | 0.5S | 0.2 | 0.5 | 1 | 3P | 5P | 6P | 10P | PX
TestingRatio, polarity, insulation resistance, partial discharge, dielectric, routine & type tests
Product Types

Types of High Voltage Instrument Transformers (50kV–245kV)

Wound Current Transformer

Wound Current Transformer

Primary winding around a magnetic core with OIP insulation and fine-graded bushings for accurate current transformation in HV systems.

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Eye Bolt Current Transformer

Eye Bolt Current Transformer

Built for high-voltage applications, safely transforming primary currents up to 800A for revenue metering and protection.

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Rigid / Bar Current Transformer

Rigid / Bar Current Transformer

Solid bar-type primary conductor withstanding fault currents up to 4000A across 36kV–245kV, for outdoor transmission substations.

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Dead Tank Inductive Voltage Transformer

Oil-impregnated paper insulated, outdoor dead-tank construction for accurate voltage measurement in HV substations.

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Key Features

Key Features of Our High Voltage Instrument Transformers (50kV–245kV)

Enhanced safety & electrical isolation through robust insulation systems, protecting personnel and equipment from high-voltage exposure
Superior measurement accuracy for revenue metering and monitoring, consistent across varying load conditions
Advanced fault detection & overvoltage protection, enhancing grid stability and system reliability
Reduced maintenance and cost-effective operation with a lower total cost of ownership
Oil-impregnated insulation systems for extended, long-term reliability in demanding HV environments
Precision-engineered bushings with optimised electric field control and capacitive grading
Applications

Applications of High Voltage Instrument Transformers (50kV–245kV)

Current and voltage measurement
Protective relaying and fault detection
Revenue and energy metering
Transmission and distribution network monitoring
Grid synchronization
SCADA, substation automation, and control systems
Solar power plants
Wind energy projects
Data centres and critical power infrastructure
Smart grids and utility modernization projects

Role of HV Instrument Transformers in Power Systems

High voltage instrument transformers play a critical role in power system protection and revenue metering for Transmission System Operators (TSOs), Distribution System Operators (DSOs), Power Generation Companies, and Independent Power Producers (IPPs). These instrument transformers enable transmission line monitoring, precise fault detection, and reliable operation of circuit breakers and isolating switches across EHV (Extra High Voltage) and UHV (Ultra High Voltage) networks. They provide accurate voltage and current measurement for protective relaying, ensuring rapid fault isolation while supporting commercial metering accuracy for billing purposes. HV instrument transformers are essential for maintaining grid stability and operational efficiency across generation, transmission, and distribution infrastructure.

Straton Electricals: Leading High Voltage Instrument Transformer Manufacturer in India

STRATON Electricals Pvt. Ltd. is a leading high-voltage instrument transformer manufacturer in India, delivering precision-engineered Current Transformers (CTs), Voltage Transformers (VTs), and customized instrument transformer solutions for applications:

  • Utilities
  • Renewable Energy Projects
  • EPC Projects
  • Industrial Plants
  • Infrastructure Projects
  • Power Transmission Networks
  • Power Distribution Networks
  • Electrical Substations
  • High Voltage Switchyards
  • Grid Protection & Metering Systems
FAQ

Frequently Asked Questions

A high-voltage instrument transformer (HV instrument transformer) is used to accurately step down high voltages and currents to standardized, measurable levels for metering, protection, and monitoring applications. These transformers provide essential electrical isolation, ensuring safe operation while maintaining high measurement accuracy in high-voltage power systems.
High-Voltage Instrument Transformers are primarily classified into Current Transformers (CTs) and Voltage Transformers (VTs), also known as Potential Transformers (PTs). CTs are used for current measurement, protection, and monitoring, while VTs/PTs provide accurate voltage measurement, protection, and monitoring. Voltage Transformers are further classified into Inductive Voltage Transformers (IVTs), which use electromagnetic induction for accurate voltage measurement and protection, and Capacitive Voltage Transformers (CVTs), which use capacitive voltage division for high-voltage transmission, voltage measurement, protection, and power line communication (PLC) applications.
A high-voltage current transformer (CT) is an instrument transformer used to step down high primary currents to standardized secondary values (typically 1 A or 5 A) for accurate metering, protection, and monitoring in power systems, while providing electrical isolation.
A high-voltage voltage transformer (VT), also referred to as a potential transformer (PT) or inductive voltage transformer (IVT), steps down high voltage levels to standardized values for accurate measurement, protection, and monitoring, while providing electrical isolation in power systems.
Potential Transformers (PTs), also known as Voltage Transformers (VTs), are specifically designed to measure high voltages in power systems. They step down high system voltages to standardized secondary values, typically 110 V or 63.5 V, enabling safe and accurate measurement using conventional metering and protection equipment while maintaining precise voltage ratio accuracy.
High-voltage Instrument Transformers are designed for safe and reliable operation using advanced insulation systems, precision-engineered bushings, optimized electric field control, and capacitive grading. High-performance insulation materials and robust dielectric design minimize electrical stress, prevent partial discharge, and withstand transient overvoltages. IEC-compliant design and rigorous testing ensure long service life while protecting equipment and personnel.
Ratio tests, polarity tests, insulation resistance, partial discharge tests, dielectric tests, and routine/type tests as per IEC/IS standards.
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Looking for IEC-Compliant High Voltage Instrument Transformers up to 245kV?

STRATON Electricals is a leading high-voltage instrument transformer manufacturer in India for CTs and VTs up to 245kV. Contact our engineering team for technical support, product selection, and customised specifications.

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Technical Datasheet

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GA Drawing

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Type-Test Summary

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