FIELD: electrical engineering.
SUBSTANCE: invention relates to the testing of power system devices, for example security devices. Essence: the power system has inputs (39) that can be galvanically connected to at least one current transformer (20, 28, 29) and at least one voltage transformer (10, 18, 19). Testing apparatus (40) is configured to apply the first test signal to the secondary side of voltage transformer (10) and simultaneously apply the second test signal to the primary side of current transformer (20).
EFFECT: technical result is simplification.
26 cl, 9 dwg
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