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Method and device for checking differential protection polarity of large transformer and computer equipment

A technology of differential protection and calibration method, which is applied in the direction of measuring devices, instruments, measuring electrical variables, etc., can solve the problems of inability to meet the test requirements of new power plants, and achieves a simple method for polarity calibration of differential protection of large transformers. Effect

Inactive Publication Date: 2019-12-20
广州粤能电力科技开发有限公司
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  • Application Information

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Problems solved by technology

However, during the implementation process, the inventors found that there are at least the following problems in the traditional technology: the traditional technology cannot meet the test requirements of new power plants

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  • Method and device for checking differential protection polarity of large transformer and computer equipment
  • Method and device for checking differential protection polarity of large transformer and computer equipment
  • Method and device for checking differential protection polarity of large transformer and computer equipment

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Embodiment Construction

[0034] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0035] In order to solve the problem that traditional technology cannot meet the test requirements of new power plants, in one embodiment, such as figure 1 As shown, a large-scale transformer differential protection polarity verification method is provided, including the following steps:

[0036] Step S110, during the starting process of the large-scale motor, obtain the differential current of the large-scale transformer; the large-scale motor is connected to the low-voltage side of the large-scale transformer.

[0037] It should be noted that before the large transforme...

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Abstract

The invention relates to a method and a device for checking differential protection polarity of a large transformer and computer equipment. The method comprises the following steps of acquiring a differential current of the large transformer in a startup process of a large motor; connecting the large motor to a low voltage side of the large transformer; and if the differential current meets a preset polarity condition, confirming that the differential protection polarity of the large transformer is correct. According to the method for checking the differential protection polarity of the largetransformer, a starting current of the large motor is utilized as a load current for checking the differential protection polarity of the large transformer, the differential current of the large transformer is acquired in the startup process of the large motor, and when the differential current meets the preset polarity condition, the differential protection polarity of the large transformer is judged to be correct, the requirements for checking the protection polarity of the large transformer of a new power plant are met, so that the operation condition can be achieved when the large transformer is put into operation, and the method for checking the differential protection polarity of the large transformer is simple, reliable and economical.

Description

technical field [0001] The present application relates to the technical field of debugging large-scale transformers in power plants, in particular to a polarity verification method, device and computer equipment for differential protection of large-scale transformers. Background technique [0002] Large-scale transformers are important equipment in power plants and the pivotal equipment connecting power plants and power grids. The electricity generated by the power plant must be transmitted to the grid through a step-up transformer, and vice versa, the electricity from the grid must also be supplied to the power plant for use by a step-down transformer. The power supply for the power plant is the precondition for commissioning and trial operation of each auxiliary system during the new period of the power plant. According to the relevant requirements of the power grid, before the transformer connected to the power grid is officially put into operation, the transformer must ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/06
Inventor 邓外哺李华林黄天龙朱威
Owner 广州粤能电力科技开发有限公司
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