Voltage level signaling device in the network. 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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I offer the simplest signaling device for voltage output in the network beyond the established limits. Its scheme is shown in the figure.
Resistor R2 is selected so that the HL1 neon lamp is turned on only when the voltage in the network is more than 190 V. And by selecting the resistor R4, the HL2 lamp is turned on only at a voltage exceeding 240 V.
Thus, at a voltage of less than 190 V, the lamps are turned off, in the range of 190 ... 240 V, one of them shines, and at an even higher voltage, both.
The device can use neon lamps not only of the type indicated on the diagram, but also any other with a working current of not more than 1 ... 2 mA.
Author: Ya. Mandrik, Chernivtsi, Ukraine
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