Segmented closed-loop control phase selection breaking control device and control method

Abstract

The invention relates to a segmented closed-loop control phase selection breaking control device and control method, the phase selection breaking control device comprises a controller, a data acquisition module, a driving module and an input and output module, the controller processes an input signal, determines a phase selection breaking condition, and performs a phase selection breaking control function; the data acquisition module is used for acquiring and processing three-phase voltage and current signals in a power grid in real time, performing zero point detection and sending a zero point signal to the controller; the driving module is used for driving the switching mechanism to work and completing enabling control on a winding coil in the permanent magnetic mechanism; the transient recovery voltage and the vacuum gap are monitored in real time, whether the breakdown risk exists or not is judged based on the corresponding relation between the breakdown voltage and the vacuum gap, the on-off speed of the circuit breaker is controlled in a closed-loop mode, and the optimal balance of the on-off speed and the cut-off value of the vacuum circuit breaker is achieved.

Description

technical field [0001] The invention relates to the technical field of medium and low-voltage circuit devices, in particular to a phase-selection breaking control device and a control method for segmental closed-loop control. Background technique [0002] Vacuum circuit breakers have the advantages of strong arc extinguishing ability, less environmental pollution, and frequent operation. They are widely used in medium and low voltage fields of 40.5KV and below. They are important equipment in power systems and are crucial to the safe and reliable operation of power systems. [0003] However, there is a saturation effect of medium strength in its vacuum gap, and it is prone to phenomena such as interception, reburning and equivalent interception during operation, which seriously restricts its service life and performance. [0004] The phase-selection opening and closing technology is widely used in the opening and closing of vacuum circuit breakers. According to the voltage o...

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Problems solved by technology

[0005] However, the traditional phase selection opening and closing technology fails to fully consider the electrical characteristics, mechanical characteristics and related influencing factors of the vacuum circuit breaker, which eventually leads to the inability to accurately control the optimal opening and closing phase of each phase

Although increasing the opening speed of the circuit breaker can effectively avoid re-ignition and improve the success rate of breaking, but with the increase of the opening speed, the cut-off value will also increase, resulting in higher cut-off overvoltage

If re-ignition occurs during the breaking process, and the equivalent cut-off occurs, the increase of the opening speed will generate higher overvoltage, and the damage will be more serious

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