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A Differential Protection Method Against Abnormally Large Number of Sampling Values

A technology of differential protection and differential protection devices, which is applied in the direction of automatically disconnected emergency protection devices, emergency protection circuit devices, electrical components, etc. to improve reliability, prevent misoperation of protection, and make the criterion simple and easy to use

Active Publication Date: 2017-12-01
北京天能继保电力科技有限公司
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  • Abstract
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Problems solved by technology

[0004] However, there are electromagnetic interference problems on the site where the protection device is installed, and the hardware of the protection device is often abnormal, which leads to abnormal sampling values ​​in the data acquisition system. When the current sampling values ​​are continuously or intermittently large, it will cause differential protection to malfunction. , a serious threat to power grid security

Method used

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  • A Differential Protection Method Against Abnormally Large Number of Sampling Values
  • A Differential Protection Method Against Abnormally Large Number of Sampling Values
  • A Differential Protection Method Against Abnormally Large Number of Sampling Values

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Embodiment Construction

[0038] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 as shown, figure 1 It is a flow chart of the method of the present invention, and the present invention provides a differential protection method for preventing abnormally large sampling values. When the sampling value is normal, there is a fault sampling value of one cycle after a fault occurs. If the effective value of the fundamental difference current calculated by the full-cycle Fourier algorithm is greater than the differential action value, the first half cycle and the first half cycle calculated by the half-cycle Fourier algorithm The RMS value of the fundamental difference current in the second half cycle is also greater than the differential action value; the criterion does not affect the protection action behavior. When the sampling value is abnormally large, the sudden change of the differentia...

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Abstract

The invention provides a differential protection method for preventing abnormally great number of sampling values. The differential protection method includes steps of starting sudden change of current or current effective value when abnormally great number of sampling values of a device to be protected is generated; after starting protection, waiting for a cycle of data, and starting allowance criteria if the abnormally great number of the sampling values in one cycle is continuously or intermittently generated and data calculated by full-cycle Fourier algorithm satisfy action criteria. The differential protection method is applicable to various differential protections such as differential protection of transformer and other quick-break actions, and the problem that misoperation of the protection device is caused by abnormalities of the sampling value of a data acquisition system of the protection device when electromagnetic interference occurs at the mounting position of the protection device or hardware of the protection device is abnormal is avoided.

Description

technical field [0001] The invention relates to a method in the technical field of electric power system relay protection, in particular to a differential protection method for preventing abnormally large sampling values. Background technique [0002] The current differential protection principle is the most ideal relay protection principle. Differential protection regards the protected device as a node, and the currents flowing into and out of the protected device are equal in normal conditions, and its differential current is equal to zero; when the protected device fails, the two currents are not equal, and the differential current is greater than zero ; When the differential current is greater than the setting value of the differential protection device, the protection outlet will act, and the circuit breakers on each side of the protected equipment will trip, so that the faulty equipment will be disconnected from the power supply. [0003] The principle of differential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/26
Inventor 柴静波李春久刘海波
Owner 北京天能继保电力科技有限公司
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