Circuit breaker porcelain bushing flashover identification method and system
An identification method and technology for circuit breakers, applied in circuit breaker testing, instruments, measuring devices, etc., can solve the problems of high power failure of high-voltage electrical equipment, inability to effectively detect flashover problems, etc., to improve monitoring level and reduce monitoring costs Effect
Pending Publication Date: 2021-04-09
STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH +1
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Problems solved by technology
Since the electrical test is carried out in a power failure state, it is separated from the high-voltage electrical equipment, such as the normal operating state of the circuit breaker when it is live, and the flashover problem cannot be effectively found
At the same time, high-voltage electrical equipment outages are costly
Method used
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Embodiment Construction
[0058] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.
[0059] Such as figure 1 As shown, a flashover identification method of a circuit breaker porcelain sleeve of the present invention includes the following steps:
[0060] Step 1: Set the electric field intensity measurement points around the ABC three-phase porcelain sleeve of the circuit breaker;
[0061]Theoretically, if the electric field intensity is continuously measured along the same horizontal line, a better U-shaped curve can be obtained. Considering the cost of the arrangement of the measurement terminals, in the embodiment of the present invention, three measurement points are selected below the three-phase ceramic bushing of the beam ABC of the circuit breaker. Install three measuremen...
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The invention discloses a circuit breaker porcelain bushing flashover identification method and system. The method comprises the following steps: 1, setting circuit breaker ABC three-phase porcelain bushing surrounding electric field intensity measurement points; 2, acquiring the power frequency electric field intensity of a measurement point position on line; 3, fitting a three-phase electric field intensity value U-shaped curve by utilizing the electric field intensity values obtained by the measurement point positions; and 4, identifying whether the circuit breaker has a porcelain bushing flashover fault or not according to the three-phase electric field intensity value U-shaped curve obtained by fitting. By utilizing the U-shaped symmetry of the electric field intensity near the three-phase porcelain bushing, the online identification of the flashover fault of the porcelain bushing of the circuit breaker can be realized, the monitoring level of the flashover fault of the porcelain bushing of the circuit breaker is improved, and the monitoring cost is reduced.
Description
technical field [0001] The invention belongs to the technical field of on-line monitoring of substation electrical equipment, and relates to a flashover identification method and system for a circuit breaker porcelain sleeve. Background technique [0002] The circuit breaker is the key equipment of the substation, and its reliability is related to the safe and stable operation of the power grid. The flashover of the porcelain bushing is a latent defect of the circuit breaker in the operating state, which will reduce the insulation strength of the porcelain bushing and even cause the circuit breaker to explode. [0003] When a flashover occurs, the optical, electrical, and thermal transient multi-physical effects are coupled with each other, accompanied by drastic changes in multiple characteristic physical quantities including the electric field strength. Although the electric field strength can reflect the flashover fault of the porcelain bushing, the measured value of the f...
Claims
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IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 陈昊王伟亮陈轩徐鹏孙子昌许驰黄祖荣陈玮光
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH