DEVICE FOR CHECKING INSULATION RESISTANCE AND LEAKAGE CURRENT IN POWER INSTALLATIONS Russian patent published in 2004 - IPC

FIELD: electrical engineering; protective gear for electrical devices and units in three-phase solidly grounded neutral mains. SUBSTANCE: device gas supply mains generator incorporating measuring circuit set up of zero-sequence sensor, ground detecting circuit, final element, actuating element connected in series with load, normal and emergency state display. Device also has second current-limiting resistor and test button. Ground detecting circuit has reset button, diode, first relay coil, and first current-limiting resistor. First and second relays function as final elements. Actuating element has circuit breaker and magnetic starter. Magnetic starter coil is connected to line voltage between circuit breaker and magnetic starter contacts through second breaking contact of second relay. EFFECT: enlarged functional capabilities and enhanced reliability of device. 1 cl, 1 dwg