Phase failure protection circuit for detecting line current Part 5
Source: InternetPublisher:狂妄火龙果 Keywords: Protection circuit phase failure protection BSP Updated: 2021/01/01
The detection part of this circuit
is similar to Figure 4-21. In the figure, diodes
VD7, VDs, and VD9 form an OR gate circuit. The difference is that this line has an additional winding coil on the contactor KM coil instead of
a step-down transformer.
This circuit uses a manganese-zinc MX0-2000 type magnetic ring as a fast saturation current transformer. The secondary winding is wound with about 500 turns of enameled wire with a diameter of 0.2mm
, and the primary winding is wound with 2 to 3 turns of power wire.
Adjust the potentiometer RP (or change the values of C4 and R4). The action delay time can be changed.
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