Fault arc detection method and protection device adopting same

A technology of fault arc and detection method, which is applied in the direction of emergency protection circuit devices, measuring devices, circuit devices, etc., can solve the problem that the arc protection device cannot operate correctly, the positive and negative half waves are asymmetrical, and the AC resistive load and DC cannot be detected. arc fault etc.

Active Publication Date: 2010-04-21
JIANGSU KAILONG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because, most of the AFCI detection methods and protection circuits now judge whether the derivative of the current waveform (di/dt, that is, the steepness of the waveform) or the flat shoulder of the arc, the asymmetry of the positive and negative half waves and other characteristics exceed the set threshold and Whether the accumulated arc cycle exceeds the threshold value is used to identify the fault arc current; however, for the automobi...

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  • Fault arc detection method and protection device adopting same
  • Fault arc detection method and protection device adopting same
  • Fault arc detection method and protection device adopting same

Examples

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Embodiment 1

[0046] A fault arc detection method, first sampling the current signal to obtain the sampling signal, then separating the high-frequency part from the sampling signal, then identifying the arc by detecting the energy mutation of the high-frequency part and recording the number of occurrences of the arc, and finally passing Detect the number of arcs to identify the fault arc (the basic principle is that if there are 8 half-cycle arcs within 0.5 seconds, it is recognized as the existence of a fault arc); wherein, the high frequency part refers to the high frequency of 2.5kHz to 100kHz in the sampling signal signal; the sampling signal is carried out by lifting the wavelet packet to carry out multi-layer decomposition to separate the high-frequency part, and the high-frequency part is first processed through filtering (removing the high-frequency interference signal energy caused by AD precision error and circuit noise at normal time), Perform arc identification again.

[0047] F...

Embodiment 2

[0125] As shown in Fig. 1(b) and Fig. 2(b), this embodiment is an arc fault protection device applied to DC. The difference from Embodiment 1 is that a DC sensor is used to sample the DC current signal, and the DC sensor is composed of The shunt S and the differential voltage conversion chip U6 are composed (the DC sensor can also be a Hall DC sensor), and the others are the same as those in Embodiment 1.

[0126] The DC sensor in Figure 1(b) converts the DC current I dc Converted into a DC voltage device U that can be conveniently sampled by AD dc , the input-output relationship is U dc =R(I dc ), where R is a function mapping relationship, which can be a linear relationship or a nonlinear mapping relationship. In the DC sensor, the DC current is converted into a differential voltage by the shunt S, and then the differential voltage is converted into a ground voltage by the differential voltage conversion chip U6.

[0127] The arc fault detection method of this embodiment...

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Abstract

The invention discloses a fault arc detection method which comprises the following steps of: sampling a current signal to acquire a sampling signal, then separating a high-frequency part from the sampling signal, identifying electric arcs by detecting the energy mutation of the high-frequency part and recording the appearance frequency of the electric arcs, and finally identifying a fault arc by detecting the frequency of the electric arcs. By utilizing the characteristic that the fault arc waveform contains high-frequency disturbance as a judgment condition for identify the electric arcs, the method effectively detects the alterative-current resistant load and the direct-current fault arc. The invention also discloses a protection device adopting the method, which can effectively recognize various fault arcs and takes corresponding protection measures.

Description

technical field [0001] The invention belongs to the field of circuit protection equipment, and in particular relates to a method for detecting fault arcs in a power distribution terminal system and a protection device using the method. Background technique [0002] Electrical lines and equipment in the house, such as: electrical wiring, sockets, wires inside household appliances or power lines of electrical appliances, etc., due to long-term overload operation, or poor electrical connections, etc., the insulation layer of the wires is aging , the insulation effect is reduced, or the insulation layer is damaged, a fault arc may occur. Arc sparks ignite the wiring and cause a fire. Currently commonly used circuit protection devices such as fuses and ground fault circuit interrupters cannot effectively detect fault arcs and form open circuit protection. AFCI (ArcFault Circuit Interrupter) technology is the latest circuit protection technology, which can provide arc fault prot...

Claims

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Application Information

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IPC IPC(8): G01R19/00H02H3/28
Inventor 吴为麟郑伟彦吴晶莹
Owner JIANGSU KAILONG ELECTRONICS
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