A full compensation realization method of a controllable current source combined with a pre-adjusted arc suppression coil
A technology of an arc suppressing coil and a realization method, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problem of inability to accurately determine the compensation current of a controllable current source and ensure operation Safety and other issues
Active Publication Date: 2020-11-17
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
[0004] This application provides a full compensation implementation method of a controllable current source combined with a pre-adjusted arc suppression coil to solve the problems in the prior art that the compensation current of the controllable current source cannot be accurately determined, and the operation safety cannot be guaranteed
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[0052] In order to make the purpose, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application. The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0053] figure 2 Is an application scenario diagram of an embodiment of this application, figure 2 The structure includes: a controllable current source 1, a voltage sensor 2, a current sensor 3, a ca...
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The embodiment of the invention discloses a full compensation implementation method for a controllable current source by cooperating with a presetting arc extinguishing coil, which comprises the stepsthat the line voltage of the system is detected when the system is normal operation; the controllable current source outputs first detection current to detect first neutral point voltage and first arc extinguishing coil current; the controllable current source outputs second detection current to detect second neutral point voltage and second arc extinguishing coil current; the current required tobe output when the single-phase grounding occurs in different phases of the system and the controllable current source fully compensates the grounding current is calculated; whether the single-phasegrounding occurs in the system or not is judged; if the single-phase grounding occurs, the grounding phase is determined; and the controllable current source outputs the current required to be outputwhen the controllable current source corresponding to the grounding phase fully compensates the grounding current. The embodiment of the invention accurately calculates the output current required byfull compensation of the controllable current source on the basis of not changing the operation mode of the original arc extinguishing coil and damping resistor, and ensures the operation safety of the system.
Description
Technical field [0001] This application relates to the technical field of single-phase grounding full compensation for power grid systems, and in particular to a method for implementing full compensation in which a controllable current source cooperates with a pre-regulated arc suppression coil. Background technique [0002] In power grid systems, especially in low- and medium-voltage distribution grid systems, single-phase ground faults account for the absolute majority of the total number of faults. When the system capacitance current exceeds a certain value, the grounding arc cannot be extinguished by itself when a single-phase grounding fault occurs, resulting in arc overvoltage and other secondary hazards. Medium and low-voltage power distribution networks generally use small current grounding methods, including neutral point ungrounded or neutral grounded through arc suppression coils. When the neutral point is not grounded, the grounding arc cannot be extinguished by itse...
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IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 刘红文赵现平柴晨超
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST