Electric power switch action time dynamic measurement method and application, and electric power switch AC zero crossing point accurate control method and application

Abstract

The present invention relates to an electric power switch action time dynamic measurement method and application, and an electric power switch AC zero crossing point accurate control method and application. The electric power switch action time dynamic measurement method comprises the following steps of 1) before sending out a switching or cut-off action command to an electric power switch, applying a high-frequency carrier at the input side of the electric power switch as a detection signal source, at the same time, detecting the applied high-frequency carrier at the output side of the electric power switch; 2) sending out the switching or cut-off action command to the electric power switch, and calculating the switching or cut-off action time of the electric power switch by taking the time of sending out the switching or cut-off action command as the starting action time of the switch, and taking the time of starting detecting an applied high-frequency carrier signal at the output side of the electric power switch as the time of the switch of finishing the switching action, or taking the time when the applied high-frequency carrier signal is detected to lose at the output side of the electric power switch as the time of the switch of finishing the cut-off action. According to the method of the present invention, the switching action time of the electric power switch can be measured accurately.

Description

technical field [0001] The present invention relates to a dynamic measurement method for the action time of a power switch, and also relates to a dynamic measurement system for the action time of a power switch. In addition, it also relates to the application of the above method or system in the precise control of the AC zero-crossing point of the power switch. The power switch AC of the present invention Zero-crossing precision control technology can be applied in medium and high voltage fields. Background technique [0002] At present, almost all electrical equipment in the world is connected to the power grid through switching equipment. At present, the grid mainly uses 50hz or 60hz alternating current. The characteristic of alternating current is that the voltage and current change periodically according to the law of sine waves according to the frequency. Each cycle of a sine wave has two voltage zero-crossing points and two current zero-crossing points. For a century, ...

AI Technical Summary

Problems solved by technology

Due to the discreteness and inconsistency of the switching action time of different switches or circuit breakers, and the action process is affected by the number of actions, etc., practice has proved that the above-mentioned control technology that pre-sets the parameters of zero-crossing switching in the computer cannot guarantee that all The switch or circuit breaker can perform accurate zero-crossing switching, and because of the expected zero-crossing switching design, in fact, the zero-crossing switching can not be realized, resulting in new electrical faults

Especially for switches or circuit breakers in the medium and high voltage power supply system, this method cannot be applied at all, because once the power switch in the medium and high voltage power supply system has an arcing phenomenon, the consequences will be very serious (it will cause explosion or combustion), so it cannot be used at all. Accept the uncertainty that comes with this instability

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