Device for protection of three-phase consumers. Scheme, description

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Device for protection of three-phase consumers. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network, uninterruptible power supplies

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A break in one of the phases supplied to a three-phase consumer can lead to failure of the electric motor or other load, which will cause an emergency in the process circuit.

Three-phase consumer protection device

The proposed simple device will allow, in the absence of one of the phases, to turn off the consumer, which is powered through a magnetic starter. The device (see figure) contains a three-phase half-wave rectifier, the input of which is connected directly to the output terminals of the consumer, and the output is connected to a series circuit consisting of a thyristor VS1, a resistor R1 and an electromagnetic relay K1.

The device works as follows. If there are three phases and when the SB1 button is pressed, the KM1 magnetic starter is turned on, which connects a three-phase consumer with its contacts. In this case, power is supplied to a half-wave three-phase rectifier. The thyristor VS1 opens, the relay K1 turns on, the contacts of which K1.1 block the button SB1, and the contacts K1.2 open. In this position, normal operation of the consumer is ensured.

If one of the phases is interrupted, the voltage at the rectifier output will have an interval with zero voltage, which will lead to the closing of the thyristor VS1. In this case, the relay K1 turns off and its contacts K1.1 break the power circuits of the coil of the magnetic starter KM1, the consumer de-energizes. Relay K1 type RES-9 (passport RS4.529.029.01.02), you can use any other relay with a coil resistance of 500 ... 550 Ohm and a trip current of 30 mA.

For other relay data, it is necessary to select the resistance of the resistor R1 and the operating voltage of the capacitor C1. Capacitor C1 type K5012, resistor R1 type PEV-10. Diodes VD1 ... VD3 can be replaced with D226B, thyristor VS1 - with KU201K.

When properly assembled, the device does not require adjustment.

Author: V.F. Yakovlev

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