Arc identification method and system for arc identification
A technology of arc identification and arc fault, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve the problems of complex time domain analysis and frequency domain analysis and low reliability
Active Publication Date: 2020-07-10
SHENZHEN POWER SUPPLY BUREAU
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[0003] Based on this, it is necessary to provide an arc identification method and a system for arc identification in view of the problems of low reliability of traditional measuring devices, time-domain analysis and frequency-domain analysis that are too complex and difficult to implement in engineering
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[0022] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is for a more thorough and comprehensive understanding of the disclosure of the present invention.
[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or a central element may also exist. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "rear", "circumfe...
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The invention relates to the technical field of low-voltage direct-current power distribution and utilization application, and discloses an arc identification method and a system for arc identification. The method comprises the following steps: disturbing an input electric signal of the converter, correspondingly changing an output current signal of the converter, and acquiring a current signal component shunted by external circuit impedance in the output current signal of the converter; monitoring the current signal component, and the ripple waves with the amplitude periodically changing being caused by disturbance of an input electric signal of the converter; and judging whether an arc fault occurs in the system or not according to the ripples. According to the method, the characteristicthat the output current amplitudes of the converter are different before and after the arc fault occurs is utilized, so that whether the arc fault occurs or not is judged according to the current amplitude change condition, a measuring device does not need to be additionally used for judgment, arc recognition can be achieved only by observing ripples on the output side of the converter, and a complex algorithm is not needed.
Description
Technical field [0001] The invention relates to the technical field of low-voltage direct current power distribution applications, in particular to an arc identification method and a system for arc identification. Background technique [0002] Compared with the arc in the AC system, the arc in the DC power distribution system has no zero crossing point, so the DC arc is more difficult to extinguish than the AC arc. The electric arc in the DC power distribution system brings huge safety hazards, and is easy to cause safety accidents such as fire and explosion. Since the arc can be regarded as a non-linear resistance, when a series arc occurs in the system, the circuit impedance of the system will increase, and the traditional overcurrent protection cannot take into account the protection in the case of a series arc fault. Therefore, it is necessary to adopt certain arc detection methods in the power supply system to identify arc faults and avoid accidents caused by heat accumulat...
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IPC IPC(8): G01R31/12G01R23/16
CPCG01R23/167G01R31/1272
Inventor 赵宇明丁庆艾精文李艳童亦斌
Owner SHENZHEN POWER SUPPLY BUREAU