Harmony and arc elimination method of the neutral point non-valid grounding power grid and its integrated protection device

A non-effective grounding and neutral point technology, which is applied in the direction of emergency protection circuit devices, emergency protection circuit devices, and circuit devices used to limit overcurrent/overvoltage, can solve problems such as poor protection effects, and achieve high cost performance. The effect of convenient operation and maintenance and novel arc suppression method

Inactive Publication Date: 2007-08-01
孙嘉宁 +1
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Problems solved by technology

[0010] The object of the present invention is to solve the problems of existing harmonic elimination and arc suppression methods and poor product protection effects, and to invent a

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  • Harmony and arc elimination method of the neutral point non-valid grounding power grid and its integrated protection device

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] As shown in Figure 1 and 2.

[0028] A resonance elimination method for non-effectively grounded power grids at the neutral point. It is to eliminate the resonance first, and change the usual method of taking measures at the neutral point of the system transformer, and directly connect the reactor L for a short time to the voltage drop when it resonates. Between the bus bar of the phase and the ground, a harmonic elimination branch is formed, and the inductive reactance of the reactor L destroys the resonance point of the power grid system, clamps the resonance overvoltage, rapidly eliminates the resonance, and makes the capacitive current of the system to the above reactor L Discharge, protect the voltage transformer and other electrical appliances from the destruction of the resonant excitation inrush current; before the primary resonance elimi...

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Abstract

Aiming at problem of poor protecting effect of current harmonic eliminating method and product, the invention discloses a harmonic eliminating and extinguishing arc method and synthesized protecting device of neutral point nonproductive grounding electric network, thereinto the harmonic eliminating method is: When there is syntony, the reactor is merged between the generatrix of the voltage dropping phase and ground to form once harmonic eliminating spur track which can destroy syntony point and suppress syntony overvoltage to harmonic eliminating, and make the capacitance current of the system charge to the reactor to protect the voltage transformer and other electric apploance. Thereinto the extinguishing arc method is: When any phase of the electric network generates single phase arc grounding fault, a reactor is directly merged between the generatrix of the fault phase and ground to form extinguishing arc spur track to suppress the voltage of the fault phase and bypass fault current to realize extinguishing arc. The invention discloses a protecting device which matches with it at the same time, it possesses advantages: the method is novel, simple and reliable, the ratio of property and value is high, and maintenance is convenient.

Description

technical field [0001] The invention relates to a method for eliminating harmonics and arcs in a power grid and a protection device thereof, which is suitable for neutral point non-effectively grounded power grids of electric power systems, and specifically relates to a method for eliminating harmonics and arcs and a comprehensive method for neutral point non-effectively grounded power grids. protective device. Background technique [0002] Power system overvoltage is mainly divided into lightning overvoltage, operating overvoltage and resonance overvoltage; among them, resonance overvoltage occurs frequently in normal operation and is more harmful; once overvoltage occurs, it often causes damage to electrical equipment and large areas of power outages. Many operating experiences show that most of the overvoltage accidents in medium and low voltage power grids are caused by resonance phenomena. Due to the long acting time of the resonant overvoltage, it is difficult to cho...

Claims

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Application Information

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IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 林苏
Owner 孙嘉宁
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