Dynamic measurement of power switch action time and precise control method and application of AC zero crossing point
A power switch and action time technology, which is applied in the field of dynamic measurement system of power switch action time, can solve the problems of inability to guarantee zero-crossing switching of switches or circuit breakers, inability to truly realize zero-crossing switching, and inability to receive uncertainty, etc.
Active Publication Date: 2018-06-29
郑贵林
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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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[0071]At present, there are two main types of AC zero-crossing switching technologies. One is to directly use thyristors as switching devices for AC zero-crossing switching. Action, this method can achieve accurate zero-crossing switching, but there is a certain voltage drop when the thyristor is turned on. When the current flowing is large, the power consumption of the thyristor is large, and the heat is serious, and the thyristor is due to the withstand voltage value. Limited, the ability to resist overvoltage is much worse than that of mechanical switches, and it is prone to breakdown, causing instability or even failure of the power supply system; the second is to use parallel thyristors and switches or circuit breakers as switching devices for AC zero-crossing switching. The response speed is slow, and the control strategy is relatively complicated. Before the control switch or circuit breaker is closed, first control the thyristor to conduct when the voltage is zero, and ...
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A dynamic power switch (S1) action time measurement and precise alternating-current zero crossing point control method and application. The dynamic power switch (S1) action time measurement method comprises the following steps: 1) before sending a switch-on or switch-off action command to the power switch (S1), applying a high-frequency carrier at an input side of the power switch (S1) as a detection signal source, and at the same time detecting the applied high-frequency carrier at an output side of the power switch (S1); and 2) sending the switch-on or switch-off action command to the power switch (S1), and by taking the sending time of the switch-on or switch-off action command as a starting action time of the switch, and taking the time when an applied high-frequency carrier signal starts to be detected at the output side of the power switch (S1) as the time when the switch completes a switch-on action, or taking the time when it is detected that the output side of the power switch (S1) loses the applied high-frequency carrier signal as the time when the switch completes a switch-off action, calculating the switch-on or switch-off action time of the power switch (S1). In this way, the switch-on / switch-off action time of the power switch (S1) can be accurately measured.
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, ...
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IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 郑贵林
Owner 郑贵林