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Passive filtering device and method with fault arc detection function

A fault arc, passive filtering technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., to achieve the effect of ensuring accurate detection and eliminating interference

Active Publication Date: 2017-08-25
北京英瑞来科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no such method of judging the fault arc by using the change rate of the harmonic content rate

Method used

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  • Passive filtering device and method with fault arc detection function
  • Passive filtering device and method with fault arc detection function
  • Passive filtering device and method with fault arc detection function

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Embodiment Construction

[0050] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] Such as figure 1 As shown, a passive filter device with fault arc detection function, including voltage sensor PT, current sensor CT, sampling circuit, signal processing circuit, main control MCU, arc fault alarm circuit, switching value isolation output circuit, thyristor drive circuit , thyristor switches, capacitors and inductors.

[0052] Such as figure 2 As shown, the main control MCU is connected to the voltage sensor PT and the current sensor CT through the signal processing circuit and the sampling circuit. Arc alarm output and TSF switching output; enable the device to be sampled before the characteristic current of the fault arc is filtered to ensure accurate detection of the fault arc.

[0053] When the main control MCU outputs an arc fault alarm, it also controls the disconnection of the power circuit breake...

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Abstract

The invention provides a passive filtering device and method with a fault arc detection function. The device comprises a voltage sensor, a current sensor, a sampling circuit, a signal processing circuit, a master control MCU, an arc fault alarm circuit, a switch quantity isolation and output circuit, a thyristor driving circuit, a thyristor switch, a capacitor and an inductor. The current detecting part of a failed arc and a current detection part of a passive filtering are shared, a same detection signal is used, a common master control unit is used to carry out fault arc analysis and harmonic content calculation, thus the device can be sampled before of the filtering of the failed arc characteristic current, and the accurate detection of a failed arc is ensured. According to the fault arc detection method, the judgment result of a current difference parameter is used as a premise, a harmonic ratio and change rate are used to judge the failed arc, the interference of a nonlinear load can be effectively eliminated, four judgment means are used to carry out judgment at the same time, and the failed arc is accurately detected.

Description

technical field [0001] The invention relates to the technical field of power quality detection and management, in particular to a passive filter device and method with a fault arc detection function. Background technique [0002] Passive filter is a filter circuit designed by combining inductors, capacitors and resistors. It can remove one or more harmonics. It is the most common and easy-to-use passive filter structure. It has simple structure, low cost, and easy operation. The advantages of reliability and low cost are widely used in the harmonic control of the system. Passive filters are divided into single-tuned filters, double-tuned filters and high-pass filters. [0003] Arc is a kind of gas discharge phenomenon, which is the instantaneous spark generated by the current passing through some insulating medium. With the improvement of our country's economic level, the domestic electricity consumption has increased rapidly, and the power distribution system has become m...

Claims

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Application Information

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IPC IPC(8): G05B19/042G01R31/12
CPCG01R31/1272G05B19/0428G05B2219/24215
Inventor 袁敞袁洋波李旷
Owner 北京英瑞来科技有限公司
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