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Method and device for monitoring operating state of capacitor voltage transformer

A technology of voltage transformer and operating status, applied in the field of electric power, can solve problems such as misdiagnosis, hidden dangers of safe and reliable operation of power grid, and insensitive response to defects.

Inactive Publication Date: 2015-12-23
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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Problems solved by technology

During the operation of the power system, if there is a breakdown accident in the capacitance of the capacitor voltage transformer, it will bring hidden dangers to the safe and reliable operation of the power grid.
[0003] At present, the method for state diagnosis of capacitive voltage transformers is mainly infrared imaging diagnosis, but infrared imaging diagnosis is not sensitive to defects due to the influence of detected hot spots by the heat transmission path, which may easily lead to misdiagnosis

Method used

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  • Method and device for monitoring operating state of capacitor voltage transformer
  • Method and device for monitoring operating state of capacitor voltage transformer
  • Method and device for monitoring operating state of capacitor voltage transformer

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Embodiment Construction

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. 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.

[0022] Such as figure 1 As shown, the embodiment of the present invention provides a method for monitoring the operating state of a capacitive voltage transformer, including:

[0023] 11. Detect the secondary side voltage of the three-phase voltage transformer to obtain the effective value of the three-phase voltage;

[0024] 12. Determine the difference of the effect...

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Abstract

The invention discloses a method and device for monitoring the operating state of a capacitor voltage transformer, and the device comprises a three-phase voltage collector, a filter, a voltage comparator, and an alarm module, wherein the three-phase voltage collector, the filter, the voltage comparator and the alarm module are connected sequentially. The three-phase voltage collector is connected with a secondary side of the capacitor voltage transformer, and obtains a three-phase voltage from the secondary side of the capacitor voltage transformer. The filter obtains the three-phase voltage, and obtains a three-phase fundamental wave voltage according to the three-phase voltage. The voltage comparator obtains the three-phase fundamental wave voltage, and obtains the difference between effective values of any two phase voltages according to the three-phase fundamental wave voltage. The alarm module obtains the difference between effective values of any two phase voltages. If the difference between effective values of any two phase voltages is greater than a preset threshold value, the state of the corresponding capacitor voltage transformer is abnormal, and the change rate of a secondary voltage is obtained. The capacitance change rate is determined according to the change rate of the secondary voltage, and the breakdown number of capacitors is determined.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method and device for monitoring the operating state of a capacitive voltage transformer. Background technique [0002] Capacitive voltage transformer is a voltage conversion device widely used in power system at present, which converts high voltage into low voltage for measurement and protection. During the operation of the power system, if there is a breakdown accident in the capacitance of the capacitor voltage transformer, it will bring hidden dangers to the safe and reliable operation of the power grid. [0003] At present, the method for state diagnosis of capacitive voltage transformers is mainly infrared imaging diagnosis, but infrared imaging diagnosis is not sensitive to defects due to the influence of the detected hot spot by the heat transmission path, and it is easy to cause misdiagnosis. Contents of the invention [0004] The invention provides a method and device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
Inventor 李艳鹏马丽强俞华王志鹏刘永鑫高鹏
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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