FIELD: electricity.
SUBSTANCE: invention relates to electric engineering, and namely to method for relay protection and may be used for protection of integrated switchgear cubicles from arcing fault. Technical result leads to reducing of damage in case of arcing fault in integrated switchgear cubicles. In this invention currents are measured in the cubicle cable phases comparing them to the first reference value. The cable switch is switched off with time delay when these current values in at least one phase are bigger than the first reference value. Zero-phase sequence currents are measured additionally close to the switch outputs and close to the sealing end from the cable side. The difference between them is calculated and compared with the second reference value and when the difference is bigger the cable switch is cut off without time delay.
EFFECT: reducing costs for recovery of integrated switchgear cubicles in result of decrease in their damage from arcing fault.
1 dwg
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