Control device of outdoor high voltage alternating current vacuum breaker

Abstract

The invention provides a control device of an outdoor high voltage alternating current vacuum breaker, comprising three current transformers connected to a three-phase line respectively, a digital-to-analog conversion module, a master controller, a power supply module, a drive module and a key input module, The three current transformers are connected with the master controller through the digital-to-analog conversion module,the key input module and the drive module are both connected with the master controller, and the power supply module is connected with the current transformers, the drive module and the master controller respectively. The control device of the outdoor high voltage alternating current vacuum breaker can judge whether the line has a three-phase imbalanced failure through detecting the current vector value of the three-phase line and compare the current vector and the protection value, so as to realize zero-sequence protection.

Description

Technical field: [0001] The invention relates to a power supply system, in particular to a control device for an outdoor high-voltage AC vacuum circuit breaker. Background technique: [0002] At present, in the power supply system, most of the switches used in outdoor power lines and user demarcation points are outdoor high-voltage AC vacuum circuit breakers installed at scattered points. The general control devices use current transformers to detect current, and realize inrush protection and overvoltage protection through electrical protection lines. However, it does not have the function of zero-sequence protection, that is, when a power user has a single-phase grounding fault, it does not have the function of detecting and processing single-phase grounding and open-phase faults, resulting in a large number of single-phase grounding faults And phase failure failures cannot be dealt with in time, and ash burning and damage to electrical equipment and power equipment will oc...

AI Technical Summary

Problems solved by technology

[0002] At present, in the power supply system, most of the switches used in outdoor power lines and user demarcation points are outdoor high-voltage AC vacuum circuit breakers installed at scattered points. The general control devices use current transformers to detect current, and realize inrush protection and overvoltage protection through electrical protection lines. However, it does not have the function of zero-sequence protection, that is, when a power user has a single-phase grounding fault, it does not have the function of detecting and processing single-phase grounding and open-phase faults, resulting in a large number of single-phase grounding faults and phase failure failures cannot be dealt with in time, resulting in ash burning and damage to electrical equipment and power equipment

In order to realize zero-sequence current protection, it is necessary to accurately and reliably detect the zero-sequence current of the system. Sequence current transformer is used to detect zero-sequence current, so zero-sequence protection cannot be realized

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