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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

Inactive Publication Date: 2016-09-21
常熟市立得电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing three-pole disconnect leakage protection plug mainly has two circuit design modes: first, two zero-sequence current transformers are respectively connected to two IC drive circuits, the disadvantage is that the number of electronic components is doubled, and the manufacturing cost is high. At the same time, the failure rate affected by the number of components also increases; secondly, two zero-sequence current transformers are connected to an IC drive circuit in series or in parallel. Defects, such as when the ground wire contains a small amount of non-operating current, and the heating tube of the water heater also produces a small amount of leakage current of the non-operating current, since the two zero-sequence current transformers are connected to the same input port in the IC drive circuit, so they The induced voltage generated will be superimposed or offset, which will cause the leakage protection plug to fail to operate or malfunction.

Method used

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Examples

Experimental program
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Effect test

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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Abstract

The invention provides a tripolar disconnection leakage protection plug, and belongs to the technical field of low-voltage power distribution protection devices. The tripolar disconnection leakage protection plug comprises a tripping circuit, a first zero sequence current transformer, a second zero sequence current transformer and a driving circuit, wherein the driving circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a diode, a thyristor and a driving chip, the seventh pin of the driving chip is connected with one end of a secondary coil of the second zero sequence current transformer, the sixth pin of the driving chip is connected with the other end of the secondary coil of the second zero sequence current transformer through the second resistor, the second pin of the driving chip is connected with one end of the secondary coil of the first zero sequence current transformer, and the first pin of the driving chip is connected with the other end of the secondary coil of the first zero sequence current transformer through the third resistor. The tripolar disconnection leakage protection plug has the advantages that the peripheral devices of the driving chip can be greatly reduced, no action or wrong action can be eliminated, and the use reliability is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of low-voltage power distribution protection devices, and in particular relates to a three-pole disconnect leakage protection plug. Background technique [0002] The three-pole disconnect leakage protection plug is mainly aimed at the poor electricity environment of the user, such as: unreliable ground wire, privately pulled wires, use of drag strips, unreliable power sockets, etc., to provide the function of disconnecting the ground wire when it is live. The existing three-pole disconnect leakage protection plug mainly has two circuit design modes: first, two zero-sequence current transformers are respectively connected to two IC drive circuits, the disadvantage is that the number of electronic components is doubled, and the manufacturing cost is high. At the same time, the failure rate affected by the number of components also increases; secondly, two zero-sequence current transformers are connected to an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32H02H3/16
CPCH02H3/32H02H3/16
Inventor 章祖德
Owner 常熟市立得电器有限公司
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