Easy-to-install smart current sensors to empower the Internet of Energy

LEM City has upgraded the 'ART' Rogowski current sensor to measure current of up to 10000A AC and beyond with Class Accuracy 0.5. The ART achieves IEC 61869 Class 0.5 accuracy without the need for additional components like resistors or potentiometers, which can drift over time. In addition, it benefits from 'Perfect Loop' technology, a unique patented coil clasp that eliminates the inaccuracy caused by sensitivity to the position of the conductor inside the loop as well as providing an innovative, robust and fast 'Twist and Click' closure. An internal shield is provided as standard to guard against external fields, improving accuracy and optimising performance for small current measurements. The series provides the same ease of installation as existing split-core transformers, but with the benefits of being thinner and more flexible. Whatever the chosen dimension - 50mm, 70mm, 125mm, 175mm, 200mm and 300mm diameter for the aperture – the device can be mounted very quickly by simply clipping on to the cable to be measured. Contact with the cable is not necessary, and it ensures a high level of safety as well as providing a high rated insulation voltage (1000 V Cat III PD2 - reinforced). The device also allows disconnection of the coil to be detected through the use of a security seal passed through a specially designed slot, making it really useful when used with a meter. It can be used in applications requiring a protection degree up to IP 67. This updated version completes the company’s product solutions for the AC current measurement dedicated for future Smart Cities offering innovative and high quality solutions for measuring electrical parameters in Smart Grids and Industry 4.0.