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Select switching method for fast automatic ac-extincting coil grounding coil wiring system

A technology of arc suppressing coil grounding and a new method, which is applied to emergency protection circuit devices, electrical components, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problem of small fifth harmonic content and accurate line selection Low rate and other problems to achieve the effect of improving the accuracy of line selection

Active Publication Date: 2006-08-16
ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER +3
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Problems solved by technology

In the actual system, the fifth harmonic content is very small, and there are certain defects in the principle, so the accuracy of line selection is relatively low, generally not more than 70%

Method used

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  • Select switching method for fast automatic ac-extincting coil grounding coil wiring system
  • Select switching method for fast automatic ac-extincting coil grounding coil wiring system
  • Select switching method for fast automatic ac-extincting coil grounding coil wiring system

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Embodiment Construction

[0023] Such as Figure 1-6 The present invention shown is suitable for a new line selection method of a fast automatic arc suppression coil grounding system, and its working principle is as follows:

[0024] According to the analysis of references, when the small current system is grounded through the arc suppression coil, the ground current is composed of fundamental current and transient current, and the transient current is much larger than the steady state current. Transient zero-sequence current i flowing through the fault line D by the transient capacitive current i C and transient inductor current i L The two parts are superimposed.

[0025] i D = i C + i L

[0026] Due to the large inductance of the arc suppression coil, the current cannot change abruptly. In a short period of time after the fault occurs, the transient capacitive current i C much larger than the transient inductor current i L , when the fault is judged by the transient zero-se...

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Abstract

The invention is used for solving the problem of miss selection of line in rapidly automatic arc suppressing coil ground system by using current line selection scheme. It firstly selects three lines having maximum abrupt change value of zero sequence current, and then the zero sequence current abrupt change value is integrated to get comparable polarity at maximum value or minimal value from which the fault line is picked up.

Description

technical field [0001] The invention relates to a small-current grounding line selection method for a substation of a distribution network, which is particularly suitable for a neutral point grounding system through automatic fast tracking arc-suppression coils. The utility model belongs to the technical field of electric power automation. Background technique [0002] Most of the grounding methods of the 3kV ~ 35kV medium voltage power grid in my country adopt the small current grounding method. At present, with the increase of cable lines in the distribution network, the capacitive current of the system increases sharply, and many areas have exceeded the national standard, making the system The neutral point must be grounded through the arc suppression coil. In order to quickly restore the instantaneous single-phase ground fault, the automatic tracking arc-suppression coil has been gradually developed in China, and the intelligence and action speed of the arc-suppression c...

Claims

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Application Information

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IPC IPC(8): H02H9/08
Inventor 许庆强
Owner ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER
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