Voltage class
01Up to 33 kV
Outdoor Oil-Immersed
Outdoor Instrument Transformers
Outdoor Current Transformers
Manufactured for dependable protection, metering and measurement in outdoor substations and industrial power systems. INDULF manufactures oil-immersed current transformers up to 33 kV, configured to your required ratio, accuracy class, burden and insulation level.
Voltage class
UP TO 33 kV
Primary current
UP TO 3000 A
Overview
Precision in every transformer. Confidence in every installation.
Outdoor current transformers are a critical link between the primary power system and the protection and metering equipment that monitors it. INDULF manufactures oil-immersed outdoor CTs for substations, feeders and industrial power systems, with each transformer configured around the required ratio, accuracy class, burden, insulation level and core arrangement.
Our manufacturing approach combines controlled production with application-specific engineering, ensuring every transformer is built to deliver consistent electrical performance and dependable service in outdoor installations. From winding and insulation systems to assembly, finishing and final inspection, quality is maintained throughout the manufacturing process — not only at the point of dispatch.
Testing is an integral part of that process. INDULF maintains in-house testing capabilities with NABL-accredited facilities, enabling electrical performance and routine checks to be verified before dispatch. Our transformers are also supplied for approved applications across North Indian states, supporting utility, industrial, infrastructure and EPC requirements with the technical documentation required for inspection, approval and commissioning.
- Manufactured to application-specific requirements
- In-house testing with NABL-accredited capability
- Technical documentation supplied for inspection, approval and commissioning
What we manufacture
A CT range built around your application
From outdoor protection to revenue metering, INDULF manufactures CT configurations for the measurement and protection requirements of substations, feeders, industrial systems and infrastructure projects.
Up to 33 kV
Outdoor Oil-Immersed CTs
For substations, feeders and outdoor installations.
Protection
Protection-Class CTs
Designed for reliable relay operation and accurate current reproduction during fault conditions.
Metering
Metering-Class CTs
Built for accurate measurement in metering, monitoring and revenue-related applications.
Dual-core
Metering + Protection CTs
Two functions in one transformer, combining metering and protection cores where the application requires both.
Technical capability
Built to meet your project requirements
INDULF outdoor current transformers are manufactured across a range of voltage, current, accuracy and core configurations to suit protection, metering and measurement applications.
Primary current rating
02Up to 3000 A
Configured to application
Rated burden
03As Per Requirement
Selected for connected circuit
Accuracy class
040.1 / 0.2 / 0.2S / 0.5 / 0.5S / 1 / 3 / 5
Metering and protection classes
Core
05Metering / Protection / Multi-core
Single or multi-core configurations
Standards
06As per IEC 61869, IEC 60044, ANSI/IEEE
Product and project requirements
Why INDULF
From manufacturing to final testing, we control the process
Every INDULF transformer reflects controlled manufacturing, rigorous testing and a commitment to consistent quality and dependable performance.
- 01
CONTROLLED MANUFACTURING
Our instrument transformers are manufactured with controlled processes for winding, insulation, assembly and finishing, maintaining consistency from production through final inspection.
- 02
APPLICATION-LED ENGINEERING
Each transformer is configured around the required ratio, accuracy class, burden, insulation level and core arrangement for its intended protection or metering application.
- 03
IN-HOUSE TESTING
Every transformer is subjected to defined routine checks before dispatch through our in-house NABL-accredited testing facility.
- 04
QUALITY AT EVERY STAGE
Quality is maintained through defined inspection and control processes across materials, manufacturing, assembly and final inspection.
Find the right instrument transformer
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Combined unitCT-PT Metering UnitExploreExplore More from INDULF
Next step
Request a quote
Your Requirement. Our Manufacturing Capability.
Share your project requirement, specification or single-line diagram with our team. We'll review the application, confirm the appropriate CT configuration and provide the technical and commercial details you need to move forward.
- 01We review your electrical requirement and identify the appropriate CT configuration for the application.
- 02Ratio, accuracy class, burden, core arrangement and other key parameters are confirmed before production.
- 03The completed transformer is tested and supplied with the technical documentation required for your project.
Manufacturing range
Available specifications & configurations
The key parameters that define the performance and configuration of each outdoor current transformer.
| Parameter | Available configurations |
|---|---|
| Type |
|
| Rated system voltage |
|
| Rated primary current |
|
| Rated secondary current |
|
| Rated output burden |
|
| Accuracy class — metering |
|
| Accuracy class — protection |
|
| Rated frequency |
|
| Number of cores |
|
| Construction |
|