Low-current grounding comprehensive line selection method

A technology of small current grounding and line selection method, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., and can solve the problems of wrong selection and missing selection of line selection device, unsatisfactory effect, and low accuracy of line selection. , to eliminate misjudgments, increase power supply reliability, and reduce economic losses.

Inactive Publication Date: 2018-06-29
南京威尔泰电气工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many methods, they cannot be chosen randomly.
[0007] Misselection and missed selection often occurred in early line selection devices, and the effect was not satisfactory
"Low line selection accuracy rate" is a problem that has plagued people for a long time

Method used

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  • Low-current grounding comprehensive line selection method

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0038] Such as figure 1 As shown, a comprehensive line selection method for small current grounding uses multiple methods for calculation, and comprehensively selects faulty lines based on data modeling and comparison. Each method is aimed at the specific characteristics of the signal, and different methods are complementary.

[0039] 1. Intelligent group comparison method

[0040] For the neutral point ungrounded system, compare the zero-sequence voltage of the bus with the amplitude and phase of the zero-sequence current of all lines. The phase of the zero-sequence current of the faulty line should lag behind the zero-sequence voltage by 90° and be opposite to the zero-sequence current of the normal line. If the zero-sequence current of all lines is in the same phase, the bus bar is grounded. There are certain defects in the traditional method ...

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Abstract

The invention discloses a low-current grounding comprehensive line selection method. Various methods are adopted for calculation; a faulty line is comprehensively selected according to data modeling comparison; each method is in allusion to specific characteristics of a signal; different methods are complementary. The method is applicable to both a power grid with a non-grounded neutral point anda power grid with a neutral point is grounded by using an arc suppression coil. The method is particularly suitable for scenarios with complicated fault conditions and disordered fault waveforms, andis complementary to a steady-state-content line selection method. The comprehensive line selection method is very reliable in line selection result and is a continuous line selection technology; underthe condition that a fault does not disappear, a device repeatedly performs line selection calculation every other second until the fault disappears, so that several misjudgments can be effectively eliminated, and the faulty line can be accurately selected within short time; the economical loss is greatly reduced, and the power supply reliability is improved.

Description

technical field [0001] The invention relates to a comprehensive line selection method for small current grounding, which belongs to the field of comprehensive line selection control for small current grounding. Background technique [0002] The medium-voltage system of my country's urban power grids and factories and mines generally adopts the neutral point ungrounded or grounded through the arc suppression coil, referred to as the small current grounding system. When a single-phase grounding occurs in a small-current grounding system, since the current at the fault point is small and the three-phase voltage of the system is still symmetrical and does not affect the normal power supply to the load, it is generally allowed to continue to operate with a fault for 1-2 hours. However, in long-term operation, due to the non-faulty two phase-to-ground voltages rising twice, the weak link of the insulation may be broken down and develop into a phase-to-phase short circuit, which wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/088G01R31/50
Inventor 程新峰杨明田军先王丽娟赵珏斐芮新花穆若宇
Owner 南京威尔泰电气工程有限公司
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