Indication of connecting electrical appliances to a 220 V network. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, sensors, detectors
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The display device allows you to control when leaving home: are the electrical and radio devices turned off from the network? If any load with a power of ≥ 8 W remains on in the network, then both LEDs HL1 and HL2 light up (see figure).
The brightness of the glow is low at a load of 8 W (the dot in the LED is on), therefore, in bright light, in order to see the glow, you need to cover the penetration of bright light onto the LED with your palm.
The LED(s) are installed at the front door. Conductors to them (0,2 mm) are laid under the wallpaper (due to the low current passing through them). The HL2 LED can be excluded from the circuit, and if it remains, then HL1 can be installed on the inside of the door, and HL2 on the outside.
As a transformer T1, ready-made ones are used, which have a winding with a large number of turns (2000 -3000, or maybe less) and it is possible to wind 8 - 10 turns of a mounting wire of sufficient cross section. In each particular transformer, the number of turns is selected experimentally. These 8 - 10 turns will be the primary winding of the transformer, and the secondary will be those that are in the finished transformer.
Different types of finished transformers were tested. TVK 70-L2 is suitable for this purpose. However, it should be noted that not all transformers perform well in this circuit. The greater the load, the thicker it is necessary to take the mounting wire for the primary winding. Extra windings can be removed from the transformer, then there will be more space for winding the mounting wire, as the primary winding of the T1 transformer.
The primary winding T1 is included in the break of the wire supplying voltage to the apartment (for example, in the apartment box or in the power panel). A necessary condition for the implementation of such a connection is that the primary winding wire is of sufficient cross section (it warms up under load).
References:
- Nechaev N. Indicator of power consumption // Radio.-1986.-№2.
Author: P.D. Rybak
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