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Method for determining non-uniform coefficient of circuit breaker and correcting measurement result of voltage divider

A technology of uniform coefficient and measurement results, which is applied in the direction of circuit breaker testing, measuring electricity, measuring devices, etc., and can solve problems such as deviation

Active Publication Date: 2017-12-15
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In addition, when the circuit breaker breaking capacitive load test is carried out in the large-capacity test station, due to the introduction of the measuring equipment voltage divider, there is a certain deviation between the test results and the corresponding working conditions in the actual project

Method used

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  • Method for determining non-uniform coefficient of circuit breaker and correcting measurement result of voltage divider
  • Method for determining non-uniform coefficient of circuit breaker and correcting measurement result of voltage divider
  • Method for determining non-uniform coefficient of circuit breaker and correcting measurement result of voltage divider

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Embodiment Construction

[0053] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

[0054] figure 1 is a flow chart of a method for determining a breaker non-uniformity factor and correcting voltage divider measurements according to an embodiment of the present invention. like figure 1 As shown, in an embodiment of the present invention, a method for determining the non-uniformity coefficient of a circuit breaker is provided, and the method may include the following steps:

[0055] In step S11, parameters of circuit elements in the circuit breaker circuit are determined to obtain the initial voltage on the circuit elements at the moment of current breaking;

[0056]In step S12, the AC equivalent circuit and the DC equivalent circuit after the circuit...

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Abstract

The invention, which relates to the technical field of high-voltage alternating-current circuit breaker, discloses a method for determining a non-uniform coefficient of a circuit breaker and correcting a measurement result of a voltage divider. The method comprises: a parameter of a circuit component in a circuit breaker circuit is determined; an alternating-current equivalent circuit and a direct-current equivalent circuit after capacitive load breaking of the circuit breaker are established; a transient recovery voltage after superimposition of the alternating current and direct current is obtained; according to the superimposed transient recovery voltage, a voltage peak value of a breaking fracture of the circuit breaker and a compensation voltage of a voltage divider are obtained; and a non-uniform coefficient of the breaking fracture of the circuit breaker is determined according to the voltage peak value o and a measurement result of the voltage divider is corrected based on the compensation voltage. With the method disclosed by the invention, under the influence of the parameter of the circuit component in the circuit breaker circuit, the dynamic change of the non-uniform coefficient of the circuit breaker is determined accurately and effectively; and the measurement result of the voltage divider is corrected, so that a transient voltage distribution situation meeting the actual working condition better in engineering is obtained.

Description

technical field [0001] The present invention relates to the technical field of high-voltage AC circuit breakers, in particular, to a method for determining a non-uniformity coefficient of a circuit breaker and correcting a measurement result of a voltage divider. Background technique [0002] The circuit breaker is a switching device used to cut off the AC filter installed between the converter transformer and the AC power supply in the high-voltage DC transmission project. The converter station provides reactive power. When the power of DC transmission changes, the reactive power required by the converter station will also change, so the filter needs to be switched on and off according to the demand. [0003] After the circuit breaker cuts off the filter, due to the residual voltage on the filter capacitor, the fracture will bear the superimposed recovery voltage of AC and DC, and the peak value of the recovery voltage will reach twice the peak value of the AC voltage. Wh...

Claims

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Application Information

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IPC IPC(8): G01R31/327G01R35/00
CPCG01R31/3272G01R31/3274G01R35/005
Inventor 杨为
Owner STATE GRID CORP OF CHINA
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