Method for indirectly measuring resistance of breaking-closing coil of switch cabinet
A technology of opening and closing coils and measurement methods, which is applied in the directions of measuring devices, measuring electrical variables, and measuring resistance/reactance/impedance, etc., which can solve the problem that the measurement cannot be performed, it is difficult to accurately find the outlet terminals of the opening and closing coils, and it is time-consuming and laborious And other issues
Inactive Publication Date: 2018-06-19
NINGBO TRANSMISSION & DISTRIBUTION CONSTR
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Problems solved by technology
[0003] At present, for the measurement of the direct resistance of the opening and closing coils of the vacuum circuit breaker in the 10kV switchgear, the only way to dismantle the opening and closing coil terminals is to disassemble the cover plate, and then directly measure, which is time-consuming and laborious; for 35kV switchgear , even if the panel is removed, it is difficult to accurately find the corresponding opening and closing coil outlet terminals, which makes the measurement impossible, resulting in the inability to complete the handover test
At this stage, there is still no feasible solution, which can indirectly measure the DC resistance of the opening and closing coils through the aviation terminal strips drawn from the outside of the switch cabinet. DC Resistance Method
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[0033] Generally, the opening and closing circuits of the vacuum circuit breaker in the switch cabinet include a rectifier bridge, and the only measurable terminals are the two AC input terminals of the rectifier bridge. The traditional direct measurement method of voltage and current cannot be fully applied. A solution is proposed based on the analysis of the opening and closing action principles.
[0034] Such as figure 1 As shown, for the opening circuit, when it works, the auxiliary switch of the opening and closing position is closed; for the closing circuit, when it is working, the closing lock limit switch and the auxiliary switch of the opening and closing position are both closed; When the coil is in the conduction state, all the switches in the DC circuit are in the closed state, and all the switches are omitted, and the simplified opening and closing action principle process of the vacuum circuit breaker is obtained. The closing process is similar to the opening pr...
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The invention relates to the technical field of electric power testing, and especially relates to a method for indirectly measuring the resistance of a breaking-closing coil of a switch cabinet. According to the invention, two experiments are conducted, a DC pulse square wave power supply applies a DC voltage at an input end of the circuit in the first experiment, the output voltage of the DC pulse square wave power supply is adjusted in the second experiment, the voltage between two terminals corresponding to an aviation power strip and the voltage at two ends of a standard resistor are respectively measured, test data and test waveform on an oscilloscope are recorded, and thus the resistance of the breaking-closing coil of the switch cabinet is calculated. By adopting the method, a breaking-closing action principle of a vacuum circuit breaker in the switch cabinet is firstly analyzed, then a corresponding equation set is compiled according to relevant variables such as a resistor tobe measured, certain equation transformation is performed, and finally a method for indirectly and accurately calculating the resistance of the breaking-closing coil is put forward according to measurement data of the aviation power strip and the like; and influences imposed on the accuracy of the measured resistance value by conduction voltage drop of a diode can be eliminated according to the method.
Description
technical field [0001] The invention relates to the technical field of electric power testing, in particular to an indirect measurement method for opening and closing coil resistance of a switch cabinet. Background technique [0002] With the continuous growth of the power system capacity, the number of high-voltage circuit breakers has become very large, which is of great significance to ensure the safe operation of the power system. The high-voltage vacuum circuit breaker is one of the most common circuit breakers in the switch cabinet. The opening and closing coil is also called the opening and closing electromagnet. It is the control element in the control circuit of the circuit breaker. The resistance value is closely related to the reliable operation of the circuit breaker. relevant. When the resistance of the opening and closing coils is too large, when the opening and closing circuits are energized, the current flowing through the coils is too small, so that the coi...
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Inventor 徐克成孙宝法李秀磊孙博宇郝杰徐宁一王琦胡伟曦杨平陆晓波薛尔益徐湉湉田小川亓信平韩毅黄云兵
Owner NINGBO TRANSMISSION & DISTRIBUTION CONSTR