Fault arc detecting method

A fault arc and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of increasing the harmonic content rate and exceeding the limit, and achieve the effect of simplifying the judgment steps, reducing the amount of calculation, and eliminating interference.

Inactive Publication Date: 2017-08-11
北京英瑞来科技有限公司
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Problems solved by technology

[0004] The Chinese patent with the publication number CN 104764963.A discloses a method for detecting an AC arc fault, which includes a method for judging the fault arc by calculating the harmonic content rate. The defect of this method is that: if it is normal If a nonlinear load is added to the circuit, its harmonic content rate will also increase beyond the limit, but at this time the harmonic content rate will increase steadily and will not fluctuate violently. If the harmonic content rate exceeds the limit to judge, there is may be misjudged
At present, there is no such method of judging the fault arc by using the change rate of the harmonic content rate

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Embodiment Construction

[0023] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] like figure 1 As shown, a fault arc detection method uses the judgment result of the current difference parameter as a premise, and uses the change rate of the harmonic content rate to judge the fault arc; it includes the following steps:

[0025] Step 1. Use the current sensor to sample the line in real time, and use the command current calculation circuit to send the sampled value to the fault arc detection module through the frequency domain fast analysis method. The current sampling value is 128 points per cycle or 64 points per cycle ; Taking 64 points as an example, the current sampling value is recorded as I 0 , I 1 ,..., I 63 , the normal cycle current is denoted as I n0 , I n1 ,..., I n63 (Sampling value and normal value are per unit value);

[0026] Step 2. Calculate the difference parameter between the cur...

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Abstract

The invention provides a fault arc detecting method, wherein a current difference parameter determining result is used as a precondition, and a harmonic wave content change rate is used for determining a fault arc. The method comprises the following steps of 1, performing real-time sampling on a line by means of a current sensor; 2, calculating a difference parameter between current sampling period current and normal period current; 3, calculating an odd harmonic wave content change rate deltaPn, and comparing the odd harmonic wave content change rate with a corresponding threshold, and determining whether the fault arc occurs according to a comparison result; and 4, if the determining condition is satisfied, determining occurrence of the fault arc, outputting an alarm signal and simultaneously outputting an action signal for making a circuit breaker perform action. The fault arc detecting method has advantages of effectively eliminating interference of a nonlinear load, accurately detecting the fault arc, reducing calculation amount and simplifying a fault arc determining step.

Description

technical field [0001] The invention relates to the technical field of fault arc detection, in particular to a fault arc detection method. Background technique [0002] In low-voltage distribution network lines, arc faults in the form of short circuits occur from time to time, usually caused by aging and damage of insulation of lines and equipment, or poor electrical connections. When a fault arc occurs, the high temperature released by the arc will quickly This creates a buildup of energy which can cause a fire. Arc faults are the main cause of electrical fires in buildings in my country, so it is very important to detect arc faults and eliminate arc faults in time to avoid fires. [0003] At present, there are three main categories of commonly used arc fault detection methods: arc fault detection technology based on simulation model, arc fault detection technology based on physical characteristics, and arc fault detection technology based on time-frequency characteristics...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 袁敞袁洋波李旷
Owner 北京英瑞来科技有限公司
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