Load circuit fault detection circuit and method applied to breaker reclosing

A technology of fault detection circuit and load line, applied in the direction of measuring electricity, circuit devices, measuring electrical variables, etc., can solve the problems of safety, hidden danger, and inability to determine whether the line fault has been eliminated, and achieve stable performance, good performance and reliability. high effect

Active Publication Date: 2014-02-05
NANJING JIETAI ELECTRIC POWER EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the present invention aims to solve the problem that the circuit breaker in the prior art cannot determine whether the line fault is eliminated before reclosing, and there are potential safety hazards, thereby providing a kind of fault detection before reclosing, which improves the safety of the reclosing circuit breaker. Load line fault detection circuit and method applied to circuit breaker reclosing with high safety performance

Method used

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  • Load circuit fault detection circuit and method applied to breaker reclosing
  • Load circuit fault detection circuit and method applied to breaker reclosing
  • Load circuit fault detection circuit and method applied to breaker reclosing

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Embodiment 1

[0037]This embodiment provides a load line fault detection circuit applied to circuit breaker reclosing, including an auxiliary power supply 1 , a detection circuit 2 , and a controller 3 . Its circuit block diagram is as figure 1 As shown, the auxiliary power supply 1 is used to supply power to the detection circuit 2, the detection circuit 2 is connected to the load line, and is used to detect whether the fault of the load line is eliminated, and the detection circuit 2 includes a short circuit detection circuit and a leakage detection circuit, They are respectively used to detect the short-circuit fault and leakage fault of the load line. The controller 3 is connected to the detection circuit 2 and the circuit breaker respectively, figure 1 K represents the contact of the circuit breaker, which is connected to the load line. Before the circuit breaker is closed, the detection circuit 2 is controlled to detect the load line. When the fault of the load line is eliminated, th...

Embodiment 2

[0042] This embodiment is used as a preferred embodiment. On the basis of the first embodiment above, the load line fault detection circuit applied to circuit breaker reclosing further includes a switch unit 4, such as image 3 As shown, it is used to control the opening and closing of the short circuit detection circuit or leakage detection circuit. see Figure 4 , the switch unit 4 includes switches K1, K2, K3, K4, the common end of the switch K1 is connected to the first output end 14 of the auxiliary power supply 1 and the common end of the switch K2, and the common end of the switch K1 The normally open end is connected to the live wire of the load line, the common end of the switch K3 is connected to the short-circuit detection end of the controller, the normally open end of the switch K4 is connected to the neutral line of the load line, and the switch K4 The common end of and the normally open end of the switch K2 are commonly grounded.

[0043] In the load line shor...

Embodiment 3

[0046] This embodiment is used as a preferred embodiment. On the basis of the above embodiments, the load line fault detection circuit applied to circuit breaker reclosing also includes a filter capacitor, see Figure 5 , the short-circuit detection circuit further includes a capacitor C1 connected in parallel to both ends of the resistor R2. The leakage detection circuit further includes a capacitor C2 connected in parallel to both ends of the resistor R4.

[0047] In the load line short circuit and leakage fault detection circuit applied to circuit breaker reclosing provided by this embodiment, the short circuit detection circuit and leakage detection circuit also include a filter capacitor, and the filter capacitor and a resistor are connected in parallel to form an RC filter circuit to prevent the circuit from harmonic interference.

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Abstract

The invention provides a load circuit fault detection circuit and method applied to breaker reclosing. The load circuit fault detection circuit comprises a detecting circuit and a controller, the detecting circuit is connected with a load circuit for detecting the load circuit, and the detecting circuit comprises a short circuit detecting circuit and an electric leakage detection circuit which are used for detecting the short circuit fault and the electric leakage fault of the load circuit respectively. The controller is connected with the detecting circuit and a breaker respectively, and the controller controls the detecting circuit to detect the load circuit before the breaker is closed. According to the load circuit fault detection circuit, on the basis of electric leakage protection, short circuit protection and overload protection during normal working of a load, fault detection is conducted on the faulted breaker before reclosing, the load circuit is reclosed after the fault is removed, and the safety performance of the reclosed breaker is improved. The problems that whether circuit faults are overcome can not be determined, and potential safety hazards exist in a breaker in the prior art are effectively solved.

Description

technical field [0001] The invention relates to a load line fault detection circuit and method applied to circuit breaker reclosing. Specifically, the invention relates to a load line short-circuit fault and leakage fault detection circuit and method applied before circuit breaker reclosing, belonging to the technical field of electric power system relay protection. Background technique [0002] A circuit breaker (English name: circuit-breaker, circuit breaker) refers to the ability to close, carry and break current under normal circuit conditions, and to close, carry and break abnormal circuit conditions within a specified time (including short circuit conditions). conditions) current switching device. In the existing power transmission and distribution system, the current automatic reclosing circuit breaker only has the power-off reclosing function. This automatic reclosing circuit breaker can automatically disconnect the load line for protection when there is a fault. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/06G01R31/02
Inventor 江树基刘涛
Owner NANJING JIETAI ELECTRIC POWER EQUIP
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