Protective device against short-term loss of mains voltage. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network, uninterruptible power supplies
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During the operation of electrical installations, the power supply of which is made through a magnetic starter, a short-term (instantaneous) loss of mains voltage leads to the shutdown of the electrical installation. To turn it on, the intervention of the service personnel is necessary. To exclude such cases, a protective device is proposed, the circuit of which is shown in the figure.
The device contains a rectifier diode VD1, limiting resistors R1 and R2, relay K1 and capacitor C1.
In the event of a short-term (instantaneous) power failure, the KM1 magnetic starter disconnects the load and its KM1.4 contacts unlock the SB1 "Start" button. Relay K1, due to the charge of the capacitor C1, remains on for a while, depending on the capacitance of the capacitor C1, and its contacts K1.1 block the SB1 "Start" button. When voltage appears, the magnetic starter KM1 turns on and the operation of the electrical installation continues.
The device is mounted on a board made of insulating material and installed in the magnetic starter housing or near it in the electrical cabinet. Adjusting the device consists in selecting the capacitance of the capacitor C1 to obtain the necessary delay for turning off the relay K1. The device can also be used when the magnetic starter coils are designed for a voltage of 380 V. In this case, the resistance of the resistors must be increased.
Details. Relay RES-10 (passport RS524301), resistors R1 and R2 of the MLT-2 type with a resistance of 68 kOhm for a 220 V network and 100 kOhm for a 380 V network. Capacitor C1 of type K50-35 with a capacity of 100 μFCh63 V.
Author: V.F. Yakovlev
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