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Passive filter with lightning-protection isolation and arc detection functions and method thereof

An arc detection and source filter technology, which is used in emergency protection circuit devices, instruments, electrical components, etc. for limiting overcurrent/overvoltage, so as to eliminate the interference of nonlinear loads and ensure accurate detection.

Active Publication Date: 2017-08-18
北京英瑞来科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 filter with lightning-protection isolation and arc detection functions and method thereof
  • Passive filter with lightning-protection isolation and arc detection functions and method thereof
  • Passive filter with lightning-protection isolation and arc detection functions and method thereof

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Embodiment Construction

[0055] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0056] Such as figure 1 , 2 As shown, an active filter with the functions of lightning protection isolation and arc detection is a safe electrical device with the functions of ground potential counterattack isolation, fault arc detection, harmonic current suppression and three-phase unbalanced current compensation. , including voltage sensor, current sensor, sampling circuit, signal processing circuit, main control MCU, arc fault alarm circuit, switch value isolation output circuit, IGBT drive circuit, harmonic current suppression and compensation main circuit and ground potential counter-attack isolation module.

[0057] Such as image 3 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 respectively pe...

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Abstract

The invention provides a passive filter with lightning-protection isolation and arc detection functions and a method thereof. The passive filter is a safety electrical device with ground potential counterattack isolation, fault arc detection, harmonic current suppression and three-phase unbalanced current compensation functions, wherein the current detection of fault arc and the current detection part of harmonic current suppression and compensation are shared, a same detection signal is adopted, and a common main control unit is used for simultaneously analyzing the fault arc and computing compensation command current, so that the device can sample a fault arc feature current before the fault arc feature current is filtered out, and accurate detection of the fault arc is ensured. The method uses a judgment result of a current difference parameter as a premise, and uses a change rare of a harmonic ratio to judge the fault arc, so that interference of a nonlinear load can be effectively excluded, meanwhile, four kinds of judgment means are used for judging, and thus the fault arc can be accurately detected.

Description

technical field [0001] The invention relates to the technical field of power quality detection and management, in particular to an active filter and method with functions of lightning protection isolation and arc detection. Background technique [0002] In recent years, fires caused by electrical causes have occurred frequently, causing a large number of personal injuries and material losses. There are two main causes of electrical fires: (1) electric current. Including electrical fires caused by short circuit, overload, harmonics and unbalance; (2) arc fault. Such as electrical fires caused by arcs or electric sparks caused by poor contact of electrical components and ground faults. Among them, the arc phenomenon often occurs in the power supply line, and the fault arc temperature is relatively high, which seriously endangers the fire safety and is one of the important causes of electrical fires. Therefore, the research on fault arc detection is particularly important. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/26H02H3/44H02H9/04G01R31/12G01R19/10
CPCG01R19/10G01R31/12H02H3/44H02H9/04H02J3/01H02J3/26Y02E40/40Y02E40/50
Inventor 袁敞袁洋波李旷
Owner 北京英瑞来科技有限公司
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