Parameters of Three-Sequence Current Protector

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The three-section current protection, as a classical power line protection method, consists of instantaneous current quick break protection (section I), the time delay instantaneous overcurrent protection (section II) and definite time overcurrent protection (section III), which. This practice-oriented paper shows, in addition to the illustrative explanation of the basis of ground fault parameters in insulated and arc-suppression-coil-ground systems, the connection variants for determination of the ground fault direction in detail. Adequate system designs allow for the system to withstand and isolate faults while not causing additional damage and/or outages. System protection is paramount and must be understood by all persons interacting or responsible for electrical systems. The overcurrent protection function realizes definite time or inverse time characteristics according to IEC or IEEE standards, based on three phase currents.

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