A method to solve single-phase ground fault based on phase-controlled arc suppression coil
A single-phase ground fault and arc suppressing coil technology, which is applied in the direction of emergency protection circuit devices, electrical components, and emergency protection circuit devices for limiting overcurrent/overvoltage, and can solve short working hours, large active power, and ground faults. Change overheating and other problems, to increase the sudden change function of the inductor current, to achieve the effect of continuous adjustment
Active Publication Date: 2020-02-07
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0005] This application provides a method for solving single-phase grounding faults based on phase-controlled arc-suppression coils, in order to solve the problem of excessive active power, short working time, and grounding faults in the process of using arc-suppression coils in parallel with small resistors to solve single-phase grounding faults. overheating etc.
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[0036] Please refer to the attached figure 1 , The principle diagram of the arc suppression coil provided by the embodiment of this application. The arc suppression coil mentioned in the embodiment of the present application refers to a phase-controlled arc suppression coil, which is hereinafter referred to as an arc suppression coil for short.
[0037] The embodiment of the application provides a method for solving a single-phase ground fault based on a phase-controlled arc suppression coil. The method requires a specially designed arc suppression coil. The arc suppression coil includes a main winding 1, a control winding 2, and a filter winding 3. , The filter winding 3 is provided with a thyristor SCR2 control loop 4. The thyristor SCR2 control loop 4 and the filter branch 5 are arranged in parallel on the filter winding 3 and close to the main winding 1 side; the main winding 1 is connected to the main circuit of the power grid, and the control winding 2. Set up the thyristor...
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The invention provides a method for solving a single-phase earth fault based on a phase-controlled arc suppression coil, and relates to the technical field of single-phase earth fault protection of a6kV-35 kV power system. The arc suppression coil used in the method is provided with a thyristor SCR2 on a filter winding of a traditional arc suppression coil; when a permanent earth fault occurs, the thyristor SCR2 is started, and arc extinction is achieved by controlling the conduction angle of the thyristor; and when a non-permanent fault occurs, arc extinction is realized by adjusting the conduction angle of a thyristor SCR1 on a control winding. The improved phase-controlled arc suppression coil is used for solving the permanent earth fault; besides the inductance continuous adjustable function of the arc suppression coil can be realized, and the inductance current disturbance mutation function of the arc suppression coil is increased; and the zero-sequence current line selection function of substituted medium-resistance disturbance is achieved, and the function of guaranteeing the capacitive current of a zero-sequence inductance current overcompensation system is achieved. The problem existing in that a small-resistance grounding system can perform band direction line judgment according to the zero-sequence current increment is solved, and the accuracy and reliability of line selection are improved.
Description
Technical field [0001] This application relates to the technical field of single-phase connection fault protection for a 6kV-35kV power system, and in particular to a method for solving a single-phase ground fault based on a phase-controlled arc suppression coil. Background technique [0002] In recent years, the 6kV~35kV distribution network has developed rapidly. The structure of long-distance lines and cable lines makes the capacitive fault current caused by single-phase grounding become larger and larger. At present, the method of installing arc suppression coils on the grid system is mostly adopted. The arc suppression coil is connected between the neutral point of the power grid and the ground grid, and is used for single-phase faults in the power system to compensate for the capacitive current of the system, eliminate arcs at fault points, avoid expansion of the fault range, and improve system operation reliability. When a single-phase grounding fault occurs in the system,...
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IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 刘红文王科李瑞桂聂鼎
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST