Medium Voltage Current Transformer · 2.2kV–36kV

Medium Voltage Current Transformers 2.2kV to 36kV

Straton Electricals engineers medium voltage current transformers across India's most critical power environments, from indoor current transformers in substations and switchgear panels to medium voltage outdoor current transformer installations serving railway traction and renewable energy systems. Rated 1.2kV to 36kV and including 33kV current transformer variants, these MV current transformers deliver accurate current signals to protection relays, energy meters, and SCADA systems across power distribution networks, utility substations, and industrial installations.

  • Maintenance-free cast resin construction — indoor and outdoor (cycloaliphatic) variants
  • Accuracy class 0.2S/0.5S metering and 5P/10P protection, up to 4 cores
  • Compact footprint engineered for panel-mount and switchgear integration
  • Custom ratios and burdens matched to your switchgear OEM drawing
Medium Voltage Current Transformers 2.2kV to 36kV

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Certifications

Certified and Approved For

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

Medium Voltage Current Transformers: Technical Specifications

Product TypeCast Resin Medium Voltage Current Transformer
Voltage Range2.2 | 3.3 | 6.6 | 11 | 22 | 33 kV up to 36 kV
Applicable StandardsIEC 61869-1 & IEC 61869-2, IS 2705
Highest System Voltage (Um)3.6 | 7.2 | 12 | 24 kV up to 36 kV
Rated Primary Current10A to 3000A
Rated Secondary Current1A or 5A
Accuracy Classes0.2S | 0.5S | 0.5 | 1 | 5P | 10P
Burden Ratings5 VA to 30 VA, or customer-specified
Insulation TypeCast Epoxy Resin (bisphenol indoor / cycloaliphatic outdoor)
Insulation Level12/28/60kVp, 24/50/125kVp, 36/70/170kVp
Frequency50Hz / 60Hz
Short-Time Thermal CurrentUp to 40kA for 1 second
Maximum Number of CoresUp to 4
InstallationIndoor or Outdoor
Mounting TypePanel / Bus-bar Mounted
Product Types

Window, Ring, and Tape Wound Type Medium Voltage Current Transformers

All medium voltage current transformer types comply with IEC 61869-1 and IEC 61869-2, and IS 16227-1 and IS 16227-2, with partial discharge-free construction verified through in-house testing in our 700 kV Lab.

Window Type CT

Window Type CT

Allows busbars and cables to pass through the aperture — ideal for switchgear panels and bus duct installations.

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Ring Type CT

Compact toroidal design for cable installations with primary currents up to 10,000A.

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Tape Wound CT

High accuracy metering CT for busbar and cable applications in indoor substations.

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Wound Type CT

Primary winding wound around the core — suited for precise metering and protection in MV systems.

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Key Features

Key Features of Our Medium Voltage Current Transformers 2.2kV to 36kV

Voltage ratings from 2.2kV up to 36kV, indoor and outdoor variants
Accurate current transformation from 10A up to 3000A primary
Standard secondary outputs of 1A or 5A
Designed and tested in compliance with IEC 61869-2 and IS 2705
Maintenance-free cast epoxy resin construction — no oil, no periodic top-up
Up to 4 cores for combined metering and multi-stage protection
Compact dimensions engineered to fit standard switchgear cubicles
Custom CT ratio and burden configurations available
Tested in-house before dispatch, with NABL-accredited lab verification available
Applications

Applications of Medium Voltage Current Transformers 2.2kV to 36kV

Revenue metering and energy monitoring in electrical substations
Fault detection across short circuits, overcurrents, and earth faults
Feeder protection and busbar differential protection
Grid monitoring and SCADA integration
Current measurement in MV switchgear panels and motor control centres
Protection relaying in industrial power plants and captive generation units
Current monitoring in solar power plant MV collector systems
Wind farm step-up substation metering and protection
Traction substation metering and protection
Distribution substation feeder metering

Medium Voltage Instrument Transformer – Product Range

Current Transformers

  • Wound Type — Resin Cast
  • Wound Type — Cycloaliphatic Resin
  • Oil-Impregnated Paper (OIP) Current Transformer
  • Bar / Rigid Type Current Transformer
  • Eye Bolt Type Current Transformer
  • Window / Ring Type Current Transformer

Inductive Voltage Transformers

  • Single-Phase Inductive Voltage Transformer
  • Two-Phase Inductive Voltage Transformer
  • Three-Phase Inductive Voltage Transformer
  • Oil-Impregnated Paper (OIP) Inductive Voltage Transformer

Combined CT–PT Units

  • Three-Phase Combined CT–PT Unit
FAQ

Frequently Asked Questions

A medium voltage CT steps down high primary currents to standardised 1A or 5A secondary outputs for safe measurement and protection in power systems rated 1.2kV to 36kV. Operating on the principle of electromagnetic induction, MV CTs feed accurate current signals to protection relays, energy meters, and SCADA systems in substations and switchgear installations.
Wound Type CT (Resin Cast / Cycloaliphatic), Bar / Rigid Type CT, Eye Bolt Type CT, Window / Ring Type CT, and Oil-Impregnated Paper (OIP) CT.
In an electrical substation, an MV CT application feeds accurate current signals to protection relays and metering circuits, enabling fault detection, load monitoring, and power distribution management in 11kV and 33kV substation installations.
The MV CT price in India varies by voltage, construction, and accuracy class. 11kV CT cost and 33kV CT cost differ significantly. Contact Straton Electricals, a trusted transformer manufacturer in India, for accurate current transformer price quotes.
LV current transformers operate in systems up to 1.1kV and are typically used in LV switchgear panels, industrial control systems, and building electrical installations. MV current transformers span 1.2kV to 36kV and serve utility substations, power distribution networks, and industrial MV switchgear. Key differences lie in insulation design, short-time current ratings, and compliance standards — MV CTs require higher dielectric strength and are tested to IEC 61869-2 and IS 16227-2.
Selecting the right medium voltage current transformer depends on CT ratio, burden, accuracy class, and saturation limit. Evaluate metering vs protection needs, relay compatibility, switchgear integration, load current, and installation conditions.
Critical MV CT maintenance includes regular CT inspection, insulation resistance testing, terminal tightening, cleaning, oil level checks for oil-filled units, thermographic inspection, and secondary circuit testing. For sealed resin cast designs, periodic diagnostic assessment including tan delta testing and partial discharge monitoring helps ensure long-term reliability and accurate performance.
Medium voltage current transformer manufacturing at Straton Electricals follows IEC 61869-1 and IEC 61869-2, IS 16227-1 and IS 16227-2, and DIN 42600 for cast resin designs. Every unit undergoes routine testing and type testing including dielectric testing, accuracy testing, ratio and polarity verification, and partial discharge testing at our in-house 700kV partial discharge test laboratory — one of the few such facilities among instrument transformer manufacturers in India.
Metering class CTs (0.1, 0.2, 0.2S, 0.5, 0.5S) deliver high accuracy for revenue metering and energy measurement under normal load conditions. Protection class CTs (5P, 10P, PS/PX) maintain accuracy during fault conditions — overcurrents, short circuits, and earth faults — ensuring reliable protective relay operation. The key difference: metering CTs saturate quickly during faults to protect connected meters; protection CTs must remain accurate at high fault currents. Most substation installations specify both cores within a single CT housing.
Class 0.2S is the standard accuracy class for revenue metering CTs at transmission substations and grid interconnection points, offering ±0.2% ratio error from 1% to 120% of rated current. Class 0.5S is widely used for distribution-level metering and DISCOM applications. Straton Electricals manufactures 0.2S and 0.5S accuracy class current transformers from 3.3kV to 36kV for utility revenue metering and energy audit applications.
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Looking for reliable Medium Voltage Current Transformers?

Straton Electricals offers customized medium voltage current transformer solutions for switchgear OEMs, distribution substations, and industrial panel builders. Contact our engineering team for technical support, product selection, and customised CT specifications.

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