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Instrument Transformers

35 kV to 1000 kV

/ Instrument Transformers

Precision Measurement. Reliable Protection.

Instrument transformers are essential components of modern high-voltage power systems, providing accurate current and voltage transformation for metering, protection and control applications.

The portfolio covers current transformers, inductive voltage transformers, capacitor voltage transformers, combined instrument transformers and solutions for gas-insulated applications across a broad range of high-voltage, extra-high-voltage and ultra-high-voltage systems. The technical catalogue covers instrument transformer solutions from 35 kV to 1000 kV, with individual product ranges extending higher depending on configuration.

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/ Measurement You Can Rely On

Designed for Modern Power Systems

Instrument transformers provide the interface between the high-voltage primary system and secondary measuring and protection equipment.

Their role is to transform primary current or voltage into appropriate secondary values while providing electrical isolation from the high-voltage system. The available portfolio includes solutions for both measurement and protection duties.

Current Measurement

Current transformers provide secondary current signals for metering and protection applications.

Voltage Measurement

Inductive and capacitor voltage transformers convert high system voltage into suitable secondary values for measuring and protection equipment.

Protection

Dedicated protection accuracy classes and special-core configurations are available across the current transformer portfolio.

Combined Measurement

Combined instrument transformers integrate current and voltage transformer functions within one equipment configuration.

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/ High-Voltage Performance

From Measurement to Ultra-High-Voltage Applications

The instrument transformer portfolio extends across a broad range of electrical requirements, from conventional high-voltage substations to EHV and UHV transmission systems.

Up to 1100 kV

Voltage Class

The general specification for capacitor voltage transformers extends to 1100 kV.

Up to 6,000 A

Rated Primary Current

Specified current transformer and combined transformer configurations provide rated primary current capability up to 6,000 A without primary interchange.

Up to 63 kA / 3 s

Short-Time Thermal Current

High-rating current transformer configurations provide short-time thermal current capability up to 63 kA for 3 seconds.

Up to 160 kA Peak

Dynamic Current

Dynamic current capability reaches 160 kA peak in specified current transformer configurations.

/ Accuracy for Measurement & Protection

Engineered Around Secondary Performance

Instrument transformer selection is not defined by voltage alone. Accuracy class, secondary ratings, protection requirements and system conditions must be considered together.

0.1 to 1.0 / 0.2S / 0.5S

Measurement Classes

These accuracy classes are represented across the documented current transformer range.

5P / 10P / 5PR / 10PR / PX

Protection Classes

Protection accuracy options are available according to the corresponding current transformer configuration.

TPS / TPX / TPY / TPZ

Special Core Classes

Special secondary core accuracy classes are represented in the current transformer portfolio.

0.2 / 0.5 / 3P / 6P

Voltage Transformer Classes

These accuracy classes are documented for inductive, capacitor and combined voltage transformer applications.