High Voltage Rigid Bar Type Current Transformer · 36kV–245kV

High Voltage Rigid Bar Type Current Transformers

A High Voltage Rigid Bar Type Current Transformer is a current-sensing device that uses a solid rigid bar conductor to convert high primary currents up to 4000A into standardised 1A or 5A outputs, offering superior mechanical strength and stable accuracy for demanding high voltage CT system applications. Within utility substations, it supports current measurement systems and relay protection systems, feeding reliable data to meters and protective relays. As a trusted bar-type current transformer manufacturer, Straton Electricals builds every HV outdoor CT with oil-impregnated paper insulation and fine-graded bushing for uniform voltage stress distribution, ensuring rugged performance across outdoor switchyards and grid infrastructure. Fully compliant with IEC 61869-1 & 2 and IS 16227.

  • Rigid bar-type primary construction for high short-circuit and short-time current withstand
  • Voltage ratings from 36kV up to 245kV, current transformation up to 4000A
  • Oil-impregnated paper insulation with fine-graded bushings for uniform dielectric strength
  • IEC 61869-1 & 2 / IS 16227 type-tested — APTRANSCO & TGTRANSCO approved
High Voltage Rigid Bar Type Current Transformers

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Certifications

Certified and Approved For

CPRI
Type-Tested
ISO 9001:2015
Certified
ISO 14001 Certified
IS 16227
Compliance
IEC 61869-2 IEC
61869-2
ERDA
Approved
APTRANSCO Approved APTRANSCO
Approved
TGTRANSCO Approved TGTRANSCO
Approved
NABL Accredited Lab NABL
Accredited Lab
Technical Specifications

Technical Specifications of HV Rigid Bar Type Current Transformers

InstallationOutdoor
DesignRigid Bar Type
InsulationOil Impregnated Paper (OIP)
System Voltage36kV to 245kV
Primary CurrentUp to 4000A
Secondary Current1A or 5A
Number of CoresUp to 5 cores (metering + protection)
Accuracy ClassMetering: 0.2S / 0.2 / 0.5S / 0.5 / 1 · Protection: 5P / 10P / PS
Rated Burden5 VA to 30 VA per core
Short-time Thermal Current (Ith)Up to 63kA for 1s / 3s
Dynamic Peak Current (Idyn)2.5 × Ith kA
External InsulationPolymer or Porcelain
HousingAluminium or MS Fabricated
Housing FinishHot Dipped Galvanized or Polyurethane Paint
Thermal Stability TestingAvailable as per customer requirements
Partial DischargeFree up to power-frequency withstand voltage
Oil CompensationNitrogen-free SS Bellows
Secondary TerminalsStud type DIN terminals
StandardsIEC 61869-1 & 2 / IS 16227 Part 1 & 2
WarrantyUp to 5 Years
DeliveryWithin 2–3 Weeks
Key Features

Key Features of Our High Voltage Rigid Bar Type Current Transformers

Voltage ratings from 36kV, 66kV, 110kV, 132kV, 220kV up to 245kV, including IEC 61869-2 outdoor CTs for high-voltage measurement and protection applications
Accurate current transformation up to 4000A for precise fault current monitoring
Standard secondary outputs of 1A or 5A for high voltage metering CT applications
Designed and tested in compliance with IEC 61869-2 standards as a trusted utility grade current transformer
Rigid bar-type primary construction for high short circuit withstand and short-time current withstand capability
Partial discharge-free insulation system for enhanced reliability as a robust outdoor bar CT
Nitrogen-free stainless-steel bellows for thermal expansion compensation and thermal stability
Available with porcelain or polymer external insulation for demanding transmission protection transformer environments
Custom CT ratio and burden configurations available
Tested in NABL Accredited 700kV High Voltage Test Laboratory
Hot dipped galvanized or polyurethane housing for outdoor durability

Also explore High Voltage Eye Bolt Current Transformers and for alternative HV CT construction options, connect with Straton as a trusted rigid bar type CT manufacturer.

Applications

Applications of HV Rigid Bar Type Current Transformers

Straton's outdoor switchyard CT and utility transmission transformer range serves every critical transmission and distribution network — from EPC substation applications and renewable energy grid connection to utility feeder systems and electrical grid monitoring infrastructure. Explore Straton Electricals' High Voltage Current Transformers (66kV–245kV), including Wound, Eye Bolt, and Rigid Bar Type single-turn current transformer designs for outdoor applications.

Transmission & Distribution (T&D) Substations
High-Voltage Switchgear (AIS & GIS)
Utility Power Transmission Networks
Utility Switchyards & Outdoor Installations
Renewable Energy Pooling Stations (Solar, Wind & Hybrid)
Industrial High-Voltage Power Systems
EPC Infrastructure Projects
Power Generation Plants
Protection Relay & Control Systems
Revenue & Energy Metering
Smart Grid Infrastructure
Grid Monitoring and Power Quality Applications

HV Rigid Bar Type Current Transformers: Product Variants

Explore Straton Electricals’ complete range of HV current transformer specifications and bar type CT ratings across all major transmission voltage levels, including the 132kV current transformer variant. Our high voltage transformer variants and utility CT models cover every primary current ratio, accuracy class, creepage distance, and insulation coordination requirement — from 33kV to 245kV outdoor pedestal mounted installations.

  • 220OC-B — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
  • 132OC-B — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
  • 110OC-B — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
  • 066OC-B — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
  • 050OC-B — Oil Impregnated Paper (OIP) | Outdoor Pedestal Mounted
FAQ

Frequently Asked Questions

These transformers are commonly used in utility substations, outdoor switchyards, transmission networks, and renewable energy evacuation systems.
Rigid bar type construction gives excellent short-circuit withstand — typically up to 63kA for 1s / 3s — which is the main reason bar-type CTs are chosen for high fault-level substations.
Yes. High voltage rigid bar-type current transformers are specifically engineered for outdoor switchyard and substation environments, featuring weather-resistant insulation systems designed for reliable long-term outdoor operation.
High-voltage rigid bar-type current transformers provide stable current measurement, strong mechanical strength, and reliable performance in outdoor substations. Their rigid bar conductor design supports efficient power transmission, accurate metering, and dependable relay protection in high-voltage grid applications.
Talk To Us

Need High Voltage Rigid Bar Type Current Transformers for your project?

Straton Electricals manufactures high voltage rigid bar type current transformers from 36kV to 245kV for utility substations and outdoor switchyards. Contact our engineering team for technical support, product selection, and customised specifications.

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Downloads

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Technical Datasheet

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GA Drawing

General arrangement drawing Download

Type-Test Summary

Type-test certificate summary Download
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