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Magnetic control type controllable shunt reactor PT disconnection judgment method, device and system

A technology for judging devices and reactors, applied in the field of electrical engineering, can solve the problems of misadjustment, fluctuation and even reverse adjustment of the reactor control system, affecting the adjustment performance and quality of the reactor.

Pending Publication Date: 2021-03-26
NR ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It can be seen that the magnetically controlled reactor control device has high requirements on the reliability of PT, CT and other transformers and their circuits. Various control methods depend on the sampling and calculation values ​​of PT and CT transformers, which directly affect the reactor. Adjustment performance and quality; once the PT transformer used for grid-side winding control feedback is abnormal or the secondary circuit is disconnected, if there is no accurate and fast method to identify the disconnection of the PT transformer, it will lead to misadjustment and failure of the reactor control system. Misadjustment (such as causing grid-side voltage and reactive power fluctuations or even reverse regulation), not only loses the beneficial effect of stabilizing line (or bus) voltage, but also aggravates the fluctuation of line (or bus) voltage and reactive power, thus The resulting overvoltage may endanger the safe operation of other power transmission and transformation equipment

Method used

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  • Magnetic control type controllable shunt reactor PT disconnection judgment method, device and system
  • Magnetic control type controllable shunt reactor PT disconnection judgment method, device and system
  • Magnetic control type controllable shunt reactor PT disconnection judgment method, device and system

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Embodiment 1

[0084] In the embodiment of the present invention, a method for judging the PT disconnection of the magnetically controlled controllable shunt reactor is provided, such as Figure 1-3 shown, including the following steps:

[0085] (1) Obtain the setting data of the first PT located at the grid-side winding, the first PT being the voltage transformer PT1 for adjustment;

[0086] (2) Obtain the setting data of the first CT arranged at the grid-side winding or the setting data of the second PT arranged at the grid-side winding, where the second PT is an auxiliary voltage transformer PT2;

[0087] (3) Based on the setting data of the first PT and the setting data of the first CT, or based on the setting data of the first PT and the setting data of the second PT, it is determined whether the first PT or the second PT Second, whether the PT satisfies the disconnection condition, and completes the PT disconnection judgment of the magnetic control type controllable shunt reactor.

...

Embodiment 2

[0110] The difference between the embodiment of the present invention and embodiment 1 is that, in order to prevent the misjudgment of PT disconnection in the short-term process due to the grid-connected impact of the reactor or the grid-connected impact of other transformers in the station, the method further includes:

[0111] Obtain the harmonic content I of the grid-side winding H ;

[0112] If the harmonic content of the grid-side winding satisfies the following formula, immediately block the disconnection judgment of the first PT of the grid-side winding;

[0113] I H >K 2 ×I hth

[0114] In the formula, I hth Is the preset value in the control device; I hth According to the power industry standard related to the magnetic control reactor, the maximum harmonic content of the grid-side winding current is set at 3% when the grid-side voltage is sinusoidal and the reactor is adjusted within the full capacity range, and K2 is the margin coefficient.

[0115] In a speci...

Embodiment 3

[0120] Based on the same inventive concept as in Embodiment 1, the embodiment of the present invention provides a magnetically controlled controllable shunt reactor PT disconnection judgment device, including:

[0121] The first obtaining module is used to obtain the setting data of the first PT arranged at the grid-side winding;

[0122] The second obtaining module is used to obtain the setting data of the first CT provided at the grid-side winding or the setting data of the second PT provided at the grid-side winding;

[0123] The first judging module is configured to judge the first PT based on the first PT’s setting data and the first CT’s setting data, or based on the first PT’s setting data and the second PT’s setting data. Whether the first PT or the second PT satisfies the disconnection condition completes the PT disconnection judgment of the magnetic control type controllable shunt reactor.

[0124] In the first specific implementation manner of the embodiment of the...

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Abstract

The invention discloses a method, a device and a system for judging PT disconnection of a magnetically controlled controllable shunt reactor. The method comprises the following steps: acquiring set data of a first PT arranged at a network side winding; obtaining setting data of a first CT arranged at the grid-side winding or setting data of a second PT arranged at the grid-side winding; and basedon the setting data of the first PT and the setting data of the first CT, or based on the setting data of the first PT and the setting data of the second PT, determining whether the first PT or the second PT meets a disconnection condition and thus completing PT disconnection judgment of the magnetically controlled controllable shunt reactor. According to the invention, the voltage and current ofeach side winding of the magnetically controlled controllable shunt reactor are detected, so that the PT disconnection fault of the network side winding is judged according to the mutual relation between key electrical quantities, the external short-circuit fault can be correctly distinguished, and the correct adjustment of the control device is ensured.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a method, device and system for judging a PT disconnection of a magnetically controlled controllable shunt reactor. Background technique [0002] EHV / UHV long-distance transmission lines show an obvious "capacitance effect" due to the charging of the line-to-ground capacitance under light load, resulting in high voltage at the end of the line, which endangers the safe operation of power transmission and transformation equipment. In order to solve the contradiction of limiting overvoltage and reactive power compensation of long-distance heavy-duty lines, improve voltage stability level and transient operation limit, reduce line transmission loss, and balance reactive power, magnetically controlled reactors are used at the end of long-distance transmission lines Or the substation busbar can effectively realize the continuous regulation of line (or busbar)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54G01R31/52
Inventor 牟伟石祥建韩兵吴龙韩焦钟高跃刘为群陈松林文继锋徐峰
Owner NR ENG CO LTD