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Current protection control method and device for 24kV vacuum breaker

A vacuum circuit breaker and current protection technology, which is applied in the direction of overcurrent protection, emergency protection circuit devices, electrical components, etc., can solve problems such as false trips, and achieve the effect of no-setting and high reliability

Inactive Publication Date: 2010-03-10
NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
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AI Technical Summary

Problems solved by technology

There are certain defects in judging the over-current and short-circuit status of the line in this way, and the upper-level line circuit breaker may accidentally trip due to inrush current when the lower-level line suddenly closes.

Method used

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  • Current protection control method and device for 24kV vacuum breaker
  • Current protection control method and device for 24kV vacuum breaker
  • Current protection control method and device for 24kV vacuum breaker

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] A current protection control method, comprising the steps of: delaying sampling when power is suddenly turned on, so as to avoid the inrush current that occurs when the line of this level is suddenly closed; after stable operation, calculate the effective value of the current to exceed the set value; If the effective value exceeds the set value, judge whether the current in the line is inrush current or overcurrent / short circuit; if it is inrush current, resample; if it is overcurrent / short circuit, take protective action. The setting value is determined by the current of the secondary side of the micro CT1, and the general range is 5A-30A. In this embodiment, the setting value is 5A.

[0036] The effective value of current in the judgment circuit is given by the formula: Obtained; In the formula, the number of sampling points of N-di...

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Abstract

The invention discloses a current protection control method for a 24kV vacuum circuit breaker, which comprises the following steps: 1) sampling is delayed in case of sudden power up to avoid inrush current when the stage line is suddenly closed; 2) a virtual value of the current in the circuit is calculated after stable operation; 3) if the virtual value does not exceed a setting value, sampling is redone; if the virtual value exceeds the setting value, whether the current in the line is inrush current, over current or short circuit is judged; if the current is inrush current, the sampling isredone and if the current is over current or short circuit, protection is carried out. A current protection control device for a 24kV vacuum circuit breaker which fulfills the current protection method comprises a power module, a single chip microcomputer, an A, C phase current transformer, an electric quantity signal input module, a dial switch status input module, a relay output module and a trip coil drive module. The method and the device of the current protection control device have accurate control and the purpose thereof is easy to be realized.

Description

technical field [0001] The invention belongs to the field of microcomputer relay protection, and in particular relates to a 24kV line overcurrent and short circuit three-stage current protection and a current protection control method and device for avoiding line surge. Background technique [0002] With the rapid development of social economy and science and technology, the urban load density is increasing, and the 12kV distribution network has many inadaptability, while the 24kV distribution network has the characteristics of low investment, saving line loss, and strong power supply capacity. Its social benefits And economic benefits are very obvious. For this reason, my country is currently investing huge sums of money in the construction of 24kV power grids, among which the 24kV distribution network lines in Jiangsu Province have been fully constructed. Whether the power distribution system can run safely, stably, and reliably is not only directly related to the smooth ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H02H3/08
Inventor 徐建源闫鸿魁王博
Owner NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
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