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Detection method and detection device of arc fault

A technology of fault arc and detection method, which is applied in the circuit field and can solve the problems of complex arc fault detection device and high cost

Inactive Publication Date: 2019-05-17
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

therefore prone to detection errors
Secondly, the optical sensor needs to be installed and maintained, the optical signal needs to be converted into an electrical signal, and the electrical signal needs to be transmitted at the same time, which makes the arc fault detection device more complicated and the cost is higher

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  • Detection method and detection device of arc fault
  • Detection method and detection device of arc fault
  • Detection method and detection device of arc fault

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Embodiment Construction

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following examples are used to further describe the embodiments of the present invention in detail.

[0030] figure 1 It is a schematic diagram of a power system applying the arc fault detection method of the present invention. The power system is powered by a three-phase four-wire grid. Electricity flows into the power system from above and out of the power system from below. For the convenience of description below, the upstream branch of the power system is called circuit A, and the two downstream branches are called circuit B and circuit C, respectively. The so-called "upstream" and "downstream" here are relative to the direction of the current. Circuit A, circuit B, and circuit C are all provided with a circuit breaker 1 for opening or closing the circuit, a current sensor 2 for detecting the instantaneous current of the circuit, and a voltag...

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Abstract

The present invention discloses a breakdown electric arc detection method and a breakdown electric arc detection device. The method comprises a first step of calculating a resistance characteristic value Rmodel of a circuit breakdown electric arc according to a resistance model, determined by a current value I, a voltage value V and a gap g between electrodes of a circuit, of the circuit breakdown electric arc; a second step of acquiring a transient impedance value Z of the circuit; and a third step of when a similarity of the transient impedance value Z of the circuit and the resistance characteristic value Rmodel of the circuit breakdown electric arc is smaller than a preset range, determining that breakdown electric arcs occur in the circuit. With adoption of the detection device, breakdown electric arcs can be detected by only detecting the transient impedance value Z, with no need for optical sensors, radio frequency sensors or the like. Meanwhile, equipment cost, installation cost and maintenance cost for breakdown electric arc detection can be greatly reduced.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a method and device for detecting an arc fault. Background technique [0002] Electrical fires caused by electricity use are increasing year by year, and have become the main cause of fires. Existing overcurrent protective devices and residual current protective devices cannot reduce the risk of electrical fires caused by arc faults, and such electrical fire accidents account for about 30% of all electrical fires. The arc fault detection device is a novel arc fault protection device, which can detect the arc fault in the electrical circuit, and cut off the circuit before causing an electrical fire, effectively preventing the electrical fire caused by the arc fault of the terminal circuit. The arc fault circuit breaker makes up for the insufficiency of other protection devices and greatly improves the protection level of electrical fires. [0003] Some existing arc fault detection device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R27/02
Inventor 杜峰陈维刚刘臻塞巴斯蒂安·哈斯卓越
Owner SIEMENS AG