Current transformer polarity verification method and device, computer equipment and storage medium
A technology of current transformers and transformers, applied in the field of electric power, can solve the problems of low reliability, complicated operation, and increased load of transformer protection systems
Pending Publication Date: 2021-12-10
CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD
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Problems solved by technology
[0004] It can be seen that the implementation of the traditional current transformer polarity verification method needs to increase the load, the operation is more complicated, and the operating cost introduced by the current transformer polarity verification is also high
In addition, the traditional current transformer polarity verification method uses the hexagon diagram method to only determine whether there is a current transformer polarity error. When it is determined that the current transformer has a polarity error, it is necessary to rely on manual experience to determine the specific polarity. wrong current phase
The determination of the wrong polarity phase is completely dependent on manual experience, and the accuracy of the judgment result cannot be guaranteed, which makes the reliability of the transformer protection system low
Method used
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[0029] 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.
[0030] The current transformer polarity verification method provided in this application can be applied to the power system shown in FIG. 1 . refer to Figure 1a, the power system includes a grid-side current transformer 10 , a neutral-point current transformer 20 , a valve-side current transformer 30 , a voltage transformer 40 and a converter transformer 50 . Among them, the grid-side current transformer 10 is located on the grid side of the converter transformer 50 (the side where the converter transformer is connected to the AC grid), and the current information on the ...
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The invention relates to a current transformer polarity verification method and device, computer equipment and a storage medium. The method is applied to a protection system of a converter transformer, and comprises the following steps: acquiring current information of a grid-side current transformer and current information of a neutral point current transformer under the condition that the protection system is switched on without load; according to the current information of the grid-side current transformer and the current information of the neutral-point current transformer, determining the current waveform similarity of the grid-side current transformer and the neutral-point current transformer; and determining a current phase with abnormal polarity from the current phases corresponding to the network side current transformer and the neutral point current transformer according to the current waveform similarity, and performing polarity verification on the valve side current transformer according to the current phase with abnormal polarity. By adopting the method, the polarity verification efficiency and accuracy of the current transformer can be improved, so that the reliability of a converter transformer protection system is improved.
Description
technical field [0001] The present application relates to the field of electric power technology, in particular to a current transformer polarity verification method, device, computer equipment and storage medium. Background technique [0002] The transformer is an important equipment in the power transmission and transformation operation of the power system. When configuring the protection scheme for the transformer according to the dual protection principle (that is, configuring two sets of protection systems), the current transformer is often used. Whether the polarity of the current transformer is correct or not is of great significance to the normal operation of some electrical equipment in the power system. The wrong polarity of the current transformer will increase the risk of protection refusal or misoperation of the power system, that is, when the system fails, the circuit protection will not be carried out or the wrong circuit protection command will be issued, whi...
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Login to View More IPC IPC(8): G01R31/62G01R35/02
CPCG01R31/62G01R35/02
Inventor 习伟尹项根李肖博刘玢岩姚浩潘远林于杨
Owner CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD