Line protection control method and microcomputer protection device

A microcomputer protection device and control method technology, applied in the field of power transformation and distribution, can solve problems such as large excitation inrush current, achieve the effect of increasing Chen power and reducing the probability of closing failure

Active Publication Date: 2020-09-15
SGIS SONGSHAN CO LTD
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Problems solved by technology

Because there are a large number of feeder transformers on the power supply line, taking a circuit breaker connected to 20 transformers as an example, at the moment when the circuit breaker is switched on, the excitation inrush current generated by 20 transformers receiving power at the same time is large, and exceeds the fixed value of the quick-break protection, so it is related to the circuit breaker. The protection dev

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  • Line protection control method and microcomputer protection device
  • Line protection control method and microcomputer protection device
  • Line protection control method and microcomputer protection device

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Embodiment Construction

[0058] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0059] At present, overhead power supply lines are vulnerable to tree branches touching the line, lightning strikes on the line, etc., and the feeder circuit breaker will perform protection trips such as quick break or overcurrent. When a transformer on the feeder has a short-circuit fault, the circuit breaker will perform quick break or over-current protection trip. After the circuit breaker is protected and tripped, the maintenance personnel repair the short-circuit fault, and the operator restores the power supply to the feeder. Theoretically, the circuit breaker can be successfully closed after the short-circuit fault is dealt with, but in fact, due to the influence of the inrush current, the circuit breaker of the feeder often fails to close, and the protection device will report the quick-brea...

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Abstract

The embodiment of the invention provides a line protection control method and a microcomputer protection device. The method is applied to the microcomputer protection device. The method is used for controlling a circuit breaker in a power supply line. The power supply line comprises the circuit breaker and a plurality of distribution transformers, and the circuit breaker is located in a primary side line of the plurality of distribution transformers. The method in one embodiment comprises the following steps: monitoring the current of a power supply line under the condition that the circuit breaker is in a switching-on state; when it is detected that the current of the power supply line reaches a set quick-break protection constant value, judging whether the voltage on the power supply line meets a tripping protection condition or not; and when it is detected that the current of the power supply line reaches a set quick-break protection constant value and the voltage on the power supply line meets a tripping protection condition, determining that a line fault occurs in the power supply line, and sending a protection tripping instruction to the circuit breaker, so that the circuit breaker executes a tripping operation according to the protection tripping instruction. Therefore, both the power transmission success rate and the effective protection of the line can be considered.

Description

technical field [0001] The present application relates to the technical field of power transformation and distribution, in particular, to a line protection control method and a microcomputer protection device. Background technique [0002] In some power supply scenarios, for some early-built enterprise power supply stations, the circuit conditions of the power supply lines are complicated. One circuit breaker controls multiple power distribution transformers, and some circuit breakers control as many as 20 power distribution transformers. The capacity of each transformer is roughly 100-2000kVA, and the capacity of each transformer may be the same or different. The total capacity of the transformers on the power supply line where a circuit breaker is located is about 13MVA. [0003] The power supply line is 3 kilometers long, and many overhead lines are used, which are prone to line failures. In the event of a short-circuit fault, the feeder circuit breaker will perform pro...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 陶瑞基侯永革吴慧颖吴东文宁伟华钟韶王鹏谢忠忠孙健孟辉刘耀宇康旭成霞
Owner SGIS SONGSHAN CO LTD
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