Overvoltage protection machine. 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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The proposed machine disconnects the load and turns itself off when the voltage in the network is more than the maximum allowable and when it periodically disappears ("blinking" of light).
When the SB1 "On" button is pressed, the mains voltage is supplied to the relay K1 through the contacts K2.1 from the X1 connector. The relay is activated and self-blocking by contacts K1.1. Through the K1.2 contacts, the mains voltage is supplied through the VD5 diode to the R3-R4 divider, to the X2 "Load" connector and to the T1 transformer, which serves to power the machine itself. From the engine of the resistor R4, which sets the trigger voltage of the device, the control voltage is supplied through the diode VD6 to the base of the transistor VT1. Zener diode VD7 serves to protect transistors from high voltages.
When the voltage in the network is higher than normal, the voltage at the base of the composite transistor VT1-VT2 rises, it opens and turns on relay K2. Contacts K2.1 open, relay K1 de-energizes and switches off the load and the machine itself with contacts K1.2. In case of a short-term power failure in the network, relay K1 is also unlocked and disconnects the load. To turn it on, press the SB1 button again. LEDs VD3 and VD4 serve to indicate the status of the device.
Relay K1 - any with a winding operating voltage of 220 V, K2 - also any of the RES-9, RES-22 series with a response voltage of 2 ... 3 V below the supply voltage.
T1 - network, small-sized, with a voltage on the secondary winding of 12 ... 15 V.
Establishment comes down to setting the voltage of the machine to operate with resistor R4.
Author: A. Lysunets, v. Vozzhaevka, Amur Region
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