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Home / Technical Articles / The art of arc-protection relaying in MV applications

What arc protection does?

Arc-flash detection relays are superior and provide much faster arc-flash detection times compared to the differential relays. With modern arc-flash detection technology, this detection time is of the order of ¼ cycles or even lower, based on 50/60 Hz. High-speed insulated gate bipolar transistors (IGBTs) are used to provide fully rated trip outputs rather than the relatively slow conventional dry contacts.

The art of arc-protection relaying in MV applications
The art of arc-protection relaying in MV applications

Thus, arc-flash detections form a technically acceptable and cost-effective way to reduce the arc-flash hazard.

When the traditional time-grading or blocking based protection coordination principle is used, the traditional protection systems may not provide fast enough protection of substation faults. Further, high-impedance type of earth faults may cause prolonged operation times of earth-fault relays leading to the significant release of the arcing energy.

These facts pose a considerable risk to human beings and economical assets.

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Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

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