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Switching-on and switching-off delay setting calculation method capable of restraining converter transformer magnetizing inrush current

A technology of exciting inrush current and setting calculation, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of long duration, large amplitude, unsuccessful charging of protection action, etc., and achieve the effect of improving suppression and small residual magnetism

Inactive Publication Date: 2017-12-12
国家电网公司运行分公司宜宾管理处
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AI Technical Summary

Problems solved by technology

In particular, the converter transformer of UHV converter station has a large rated capacity. When the excitation inrush current occurs, it has the characteristics of large amplitude and long duration, which may cause the charging failure of the protection action in the slightest, and cause the voltage fluctuation of the power grid in severe cases.

Method used

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  • Switching-on and switching-off delay setting calculation method capable of restraining converter transformer magnetizing inrush current
  • Switching-on and switching-off delay setting calculation method capable of restraining converter transformer magnetizing inrush current
  • Switching-on and switching-off delay setting calculation method capable of restraining converter transformer magnetizing inrush current

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The method of the present invention fully considers that a 12-pulse valve group converter has two wiring modes, Y / D and Y / Y, and is different from capacitors and ordinary transformer equipment in suppressing inrush current, and optimizes the calculation of opening and closing angles. After the method, the purpose of minimizing the excitation inrush current is achieved. Such as figure 1 Shown, the inventive method comprises the following steps:

[0022] Step S101: testing the opening and closing time of the circuit breaker;

[0023] The opening and closing time of the circuit breaker is tested three times. The discreteness of the three test results should be less than or equal to 1ms, otherwise the data is invalid, and the average value of the three times is taken as the three-phase inherent opening and closing time of the cir...

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Abstract

The invention discloses a setting calculation method for closing and opening delays for suppressing the excitation inrush current of a converter transformer, comprising: testing the opening and closing times of a circuit breaker; determining the target closing angle of the circuit breaker; and calculating the delayed closing angle; Calculate the circuit breaker opening target angle and other steps. The invention can close each phase of the converter transformer at the optimal angle, so that the generated excitation inrush current is the least, and open the switch at the optimal angle, so that the generated converter transformer has the least residual magnetism, and the excitation inrush current can be reduced again during the next charging.

Description

technical field [0001] The invention relates to the field of suppressing the excitation inrush current when the converter transformer is charged through the phase selection opening and closing technology, in particular to a setting calculation method for suppressing the closing and opening delay of the converter transformer excitation inrush current. Background technique [0002] When the transformer is charging, an excitation inrush current is generated due to the magnetic saturation of the iron core, and its amplitude may exceed several times or even dozens of times the rated current of the transformer at most, and the duration varies from tens of cycles to tens of seconds. In particular, the converter transformers in UHV converter stations have a large rated capacity. When the excitation inrush current occurs, it has the characteristics of large amplitude and long duration, which may cause the charging failure of the protection action, or cause the voltage fluctuation of t...

Claims

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Application Information

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IPC IPC(8): H02H7/04
CPCH02H7/04
Inventor 张鹏李龙蛟黄宇赵冉刘晨孙光宇王闪雷曹运龙唐吕安
Owner 国家电网公司运行分公司宜宾管理处
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