Vacuum on-load tap-changer switching state evaluation method and system

A technology of on-load tap change and switch switching, which is applied in the field of transformers, can solve the problem of inability to evaluate the switching state of vacuum on-load tap changer contacts, and achieve the effect of reducing the probability of misjudgment and improving the accuracy of evaluation

Active Publication Date: 2021-03-05
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0006] The invention provides a method and system for evaluating the switching state of a vacuum on-load tap-changer, which is

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  • Vacuum on-load tap-changer switching state evaluation method and system
  • Vacuum on-load tap-changer switching state evaluation method and system
  • Vacuum on-load tap-changer switching state evaluation method and system

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[0042] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] Since arc extinguishing of the vacuum on-load tap-changer is carried out in the vacuum bubble isolated from the insulating oil, under normal circumstances, a large amount of acetylene will not be detected in the oil chromatography analysis of the insulating oil in the oil chamber of the diverter switch. If there is a small amount of acetyle...

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Abstract

The invention discloses a vacuum on-load tap-changer switching state evaluation method and system, wherein the method comprises the following steps: obtaining the total acetylene content St corresponding to the total sampling analysis frequency of a current oil chromatography, wherein t is expressed as the total sampling analysis frequency of the current oil chromatography; evaluating whether theacetylene total content St is abnormal or not according to a first preset criterion, and executing the next step when the acetylene total content St is evaluated to be abnormal; increasing the voltageregulation frequency of the vacuum on-load tap-changer to the preset increment frequency, and obtaining the total acetylene content St+k (k is more than or equal to 1) after increment, wherein k represents the preset increment frequency; and evaluating whether the total acetylene content St+k after increment is abnormal or not according to a second preset criterion so as to evaluate the switchingstate of the vacuum on-load tap-changer. According to the technical scheme, the switching state of the vacuum on-load tap-changer can be evaluated.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a method and system for evaluating the switching state of a vacuum on-load tap changer. Background technique [0002] The on-load tap changer is a device for adjusting the output voltage in a transformer. It is used to adjust the output voltage by switching the taps of the transformer winding taps to change the turns ratio of the high and low voltage windings when the transformer is excited or loaded. It is used in power systems. play an important role in voltage regulation. [0003] At present, the on-load tap-changers used in power transformers are mainly divided into two types: oil-immersed on-load tap-changers and vacuum on-load tap-changers. Among them, the switch of oil-immersed on-load tap-changers is completely immersed in insulating oil Among them, the insulation performance of the oil is used to extinguish the arc of the main contacts; although the diverter switch...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/88H01F29/04H01H33/664H01H33/66
CPCG01N30/02G01N30/88H01F29/04H01H33/664H01H33/66G01N2030/8854
Inventor 江丹宇马志钦杨贤林春耀饶章权吕鸿彭向阳
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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