Current sensors use Rogowski coils to measure 10,000A AC for smart cities

13th May 2016
Source: LEM
Posted By : Caroline Hayes
Current sensors use Rogowski coils to measure 10,000A AC for smart cities

Split-core current transformers and split core, thin, light flexible Rogowski coils for smart grid applications, such as power generators, home energy management, battery monitoring systems, medium voltage/low voltage sub-stations, sub-metering, EV stations and solar power plants.

Split-core current transformers and split core, thin, light flexible Rogowski coils for smart grid applications, such as power generators, home energy management, battery monitoring systems, medium voltage/low voltage sub-stations, sub-metering, EV stations and solar power plants.

In addition to smart grid, intelligent electrical networks, the City range measures electrical parameters in the industry 4.0 and renewable energy market.

The range includes the ART Rogowski current sensor to measure current of up to 10,000A AC and above. It achieves IEC 61869 Class 1 accuracy without additional components such as resistors or potentiometers, which can drift over time. It uses Perfect Loop technology, a patented coil clasp that means the coil can be positioned accurately to eliminate inaccuracy caused by sensitivity to the position of the conductor inside the loop. It has a ‘twist and click’ closure mechanism for secure positioning.

An internal shield guards against external fields. The ART series is as easy to install as existing split-core transformers, says the company, but with the benefits of being thinner and more flexible.

Aperture diameter options are 70, 125 and 175mm. Contact with the cable is not necessary, and the ART ensures a high level of safety as well as providing a high rated insulation voltage (1000V Cat III PD2 - reinforced).

A security seal, passed through a slot, detects disconnection of the coil. This feature is particularly useful when used with a meter, says the company. It can be used in applications requiring a protection degree up to IP67.

There is also the ATO series of split-core current transformers in two mechanical designs, one with a 10 m diameter aperture and one with 16mm for the primary conductor. The 32 models are available to accommodate different current ranges, and types of output (current or voltage).

Current output ATO models supply a ratio of 1mA/A with a class accuracy 3 whilst the voltage output ATO models are available either with a ratio of 225 or 333mV at IPR (rated primary current), with a class accuracy 1 according to IEC 61869 standard.

There is no need to disconnect the primary conductor carrying the current to be measured during installation as it can be clipped on. A cable tie system, integrated into the case allows for easy fixing to the primary conductor. ATO models can also be mounted firmly in electrical cabinets on DIN rails using a DIN rail adapter.

ART and ATO series current sensors are CE marked and conform to the IEC 61869 standard. The company offers a five-year warranty.


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