Primary conductor

Glass ring

Light wave input

Light wave output (rotated)

A "LIGHT" REVOLUTION IN CURRENT MEASUREMENT

OPTICAL CURRENT TRANSFORMER

One type of TOCT can be used for protection and metering without saturation and at the same time no danger to life and equipment due to open secondary circuits. Fiber optical connections allow complete galvanic insulation between sensor and secondary equipment and at the same time long distances coverage without issues of wiring.

TOCT are designed in accordance with IEC 61850-9-2 to provide full flexibility/connectivity for different applications and interconnection between equipment. Merging units can be used for retrofitting conventional instrument transformers

How can utilities ensure high dynamic range of current measurements, high performance, integrated safety, and connectivity for digitalization for the future? Trench Optical Current Transformers (TOCT) in combination with merging units offer the ideal solution.

HOW DOES THE TOCT WORK?

The Faraday effect, discovered by Michael Faraday in 1845, describes the relation between the Light and magnetism. In simple words, a defined light wave (input polarization) is moving through the glass ring and the magne-tic field based on the value of the electrical current results in light output polarization rotated by angle α. Therefore, the angle α is in direct relation to the electrical current.

Ey

Input polarization Output polarizationroatated by angle α

Faraday rotationEx Ex

α

For more resources onOptical current transformers

please check out our website:https://www.trench-group.com/products/optical-current-transformers/

Contact us: sales@trench-group.com

Each merging unit for optical CTs can handle up to three optical CTs and three resistive capacitive voltage deviders*.

Binary inputs and outputs are provided on 6MU85. In case more inputs and outputs are needed, those can be added as add-on-module. The same applies in case additional analog voltage or current inputs are needed.

WHAT ARE THE CUSTOMER BENEFITS?

HOW DOES THE SYSTEM WITH TOCT CAN LOOK LIKE?

Small sensor size and no saturation

Environmentally friendly no need for oil or SF6

Fiber optic connection from TOCT to merging unit provide complete galvanic insulation and long-distance coverage

Optical CT - Current TOCT + RCVT = Current & Voltage

Increased safety for equipment and life No risk for open secondary circuits

Future prove and high flexibility due to digital interface “process bus” acc. IEC 61850-9-2

Merging unit can also be connected to conventional IT´s – retrofitting

OPTICAL CURRENT SENSOR“Glass ring”

Digital interface(fibre-optic copper-based)

IEC 61850-9-2(IEC 61850-8-1)

MERGING UNIT

6MU85

I024

5

6MU85

I024

5

6MU85

I024

5

One sensor for wide range of metering and protections functions, as well wide current values range coverage: standardized model for multiple applications

* For more information on Trench RC Voltage dividersplease check out our webpage:https://trench-group.com/products/resistive-capacitive-voltage-dividers/