FIELD: electricity.
SUBSTANCE: in present invention output signal is presented by values of voltage taken from capacitance-resistance dividers connected between each phase of the protected mains and ground. Considering that voltage has sine-wave shape RC-filters with low time constant are required thus providing increase in high-speed response of the device and decrease in false operation probability due to non-availability of harmonic components. Introduced blocking unit allows switching on of one actuator relay only by means of other relays blocking. Thus high reliability of the device is attained, as simultaneous switching on of two or three actuator relays, i.e. mode of interphase short-circuiting is excluded.
EFFECT: higher efficiency and reliability.
1 dwg
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