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Reactive compensation device and method with fault arc detection function

A technology of fault arc and compensation device, which is applied in reactive power compensation, reactive power adjustment/elimination/compensation, circuit devices, etc., to achieve the effect of ensuring accurate detection and eliminating interference

Active Publication Date: 2017-08-22
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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  • Reactive compensation device and method with fault arc detection function
  • Reactive compensation device and method with fault arc detection function
  • Reactive compensation device and method with fault arc detection function

Examples

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Embodiment Construction

[0049] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] like figure 1 As shown, a reactive power compensation device with fault arc detection function, including voltage sensor, current sensor, sampling circuit, signal processing circuit, main control MCU, arc fault alarm circuit, switch value isolation output circuit, thyristor drive circuit and capacitor Switching compensation main circuit.

[0051] like figure 2 As shown, the main control MCU is connected to the voltage sensor and the current sensor through the signal processing circuit and the sampling circuit, and the main control MCU performs the arc fault alarm output respectively after the same voltage and current sampling signals are analyzed and the power factor is calculated. And capacitor switching output; so that the device can be sampled before the characteristic current of the fault arc is compensated, so as to...

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Abstract

The invention provides a reactive compensation 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 switching value isolated output circuit, a thyristor drive circuit and a capacitance switching compensation main circuit. Current detection of a fault arc and a current detection part of reactive compensation are shared, a same detection signal is adopted, and a common master control unit is used for carrying out fault arc analysis and power factor calculation simultaneously, so that the device can be sampled before characteristic current of the fault arc is filtered, and accurate detection of the fault arc is guaranteed. According to the fault arc detection method, by using the judgment result of current difference parameters as a premise, harmonic ratio change rate is adopted for judging the fault arc, so that the interference of a nonlinear load can be effectively eliminated, meanwhile four judgment methods are adopted for carrying out judgment, and the fault 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 reactive power compensation device and method with a fault arc detection function. Background technique [0002] With the development of industrialization, people pay more and more attention to the power quality problem. In the past 20 years, reactive power compensation devices using thyristor-controlled reactors mixed with fixed capacitors (FC) or mechanically switched capacitors (MSC) have been commonly used as a low-cost reactive power compensation device. [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 more and more complex. Due to the limited space of the distribution line, many wires...

Claims

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Application Information

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IPC IPC(8): H02J3/18G01R31/12
CPCG01R31/12H02J3/1821Y02E40/30
Inventor 袁敞袁洋波李旷
Owner 北京英瑞来科技有限公司
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