Tripolar disconnection leakage protection plug
A technology of leakage protection plug and three-pole switch, which is applied in the direction of automatic disconnection emergency protection device, protection that responds to fault current, emergency protection circuit device, etc., can solve the problem of non-operation of leakage protection plug, high manufacturing cost, electronic Problems such as the increase in the number of components, to avoid the superposition or offset of induced voltage, to eliminate non-operation or malfunction, and to reduce the effect of peripheral components
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Embodiment 1
[0014] see figure 1 , a three-pole disconnect leakage protection plug, including a tripping circuit 1, a first zero-sequence current transformer CT1, a second zero-sequence current transformer CT2 and a drive circuit 2. The trip circuit 1 includes a release coil KB and a three-pole switch TRIA of the release, the incoming side of the three-pole switch TRIA of the release is connected to an AC power supply, and the outgoing side of the three-pole switch TRIA of the release is connected to The phase line ACL and neutral line ACN pass through the first zero-sequence current transformer CT1, and the ground wire connected to the outlet side of the three-pole switch TRIA of the release passes through the second zero-sequence current transformer CT2. The drive circuit 2 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a diode D1, The silicon control...
Embodiment 2
[0018] see figure 2 , in this embodiment, the drive chip IC adopts the SN54123-B produced by our company, the anode of the diode D1 is connected to one end of the release coil KB, and the other end of the release coil KB is connected to the three-pole switch of the release The outlet side of the TRIA is not connected to the phase line of the first zero-sequence current transformer CT1, the cathode of the diode D1 is connected to the anode of the thyristor Q1 and one end of the first resistor R1, and the control pole of the thyristor Q1 is connected to the first capacitor One end of C1, one end of the second capacitor C2 and pin 7 of the driver chip IC are connected, the other end of the second capacitor C2 is connected to pin 6 of the driver chip IC, and pin 5 of the driver chip IC is connected to one end of the fourth capacitor C4. Pin 3 of the chip IC is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to one end of th...
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