Instrument Transformers

Instrument Transformers

Electrical instrument transformers transform high currents and voltages to standardized low and easily measurable values that are isolated from the high voltage. When used for metering purposes, instrument transformers provide voltage or current signals that are very accurate representations of the transmission line values in both magnitude and phase. These signals allow accurate determination of revenue billing.

When used for protection purposes, the instrument transformer outputs must accurately represent the transmission line values during both steady-state and transient conditions. These critical signals provide the basis for circuit-breaker operation under fault conditions, and as such are fundamental to network reliability and security.

Instrument transformers used for network control supply important information for determining the state of the operating conditions of the network.

Instrument transformers technology can also empower the grid with auxiliary power supply and highly precise power quality measurements.

Please download our instrument transformers brochure here.

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Trench Group will supply eco-friendly Blue instrument transformers to Sweden!

  • First CO2 -neutral high-voltage project for Siemens and the Trench Group in Sweden
  • Vacuum switching technology combined with “clean air” replaces SF6 as switching and insulating medium
  • High operational performance even at lowest temperatures

Siemens will equip a 145-kilovolt (kV) substation owned by E.ON Sweden with SF6-free high-voltage products by the middle of 2020. The orders comprise six bays, including circuit breakers for 72.5 kV and 145 kV from Siemens as well as 145 kV instrument transformers from Trench. With these innovative products of the so called “blue portfolio,” Siemens and Trench are supporting E.ON Sweden’s goal towards a sustainable F-gas free power transmission. The solution will be deployed at the Fårhult project site located in southern Sweden close to Västervik. It will deliver high-performance operation at extreme temperatures as low as -55° Celsius without a heating system. Read the full story …

For further information on the Trench blue portfolio, please see the Blue product section.


More than

instrument transformers

supplied by Trench for customers on all 5 continents every year.

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