Current mutual inductance circuit and current transformer
A technology of current transformer and circuit, applied in the field of power system, can solve the problem that the power frequency current and high frequency current of the current-carrying conductor cannot be measured at the same time.
Active Publication Date: 2021-07-06
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +1
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- Application Information
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Problems solved by technology
[0004] There is a problem in the existing technology that it is impossible to simultaneously measure the power frequency current and the high frequency current on the current-carrying conductor in the same integrating circuit
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[0025] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0026] The serial numbers for components in this application, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. The "connection" and "connection" mentioned in this application all include direct and indirect connection (connection) unless otherwise specified. In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inne...
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The invention relates to a current mutual inductance circuit and a current transformer. The current mutual inductance circuit comprises a magnetic induction circuit, at least one first resistor, at least one second resistor and a first inductor. The output end of the magnetic induction circuit is connected with one end of the first resistor; the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is connected with the output end of the magnetic induction circuit; the first inductor is connected in parallel with the second resistor; the common end of the first resistor and the second resistor is grounded; the magnetic induction circuit is used for inducing an electromagnetic signal of the current-carrying conductor to be measured and generating an induced current according to the electromagnetic signal; when the induction current frequency is smaller than a preset frequency threshold value, the impedance of the first inductor approaches 0; the first resistor is used for measuring power frequency current in the induced current; the second resistor is used for measuring high-frequency current in the induced current. By adopting the method, the power frequency current and the high frequency current of the current-carrying conductor to be measured can be measured in the same circuit.
Description
technical field [0001] The present application relates to the technical field of electric power systems, in particular to a current mutual induction circuit and a current mutual inductor. Background technique [0002] With the rapid development of my country's power system, current transformers, as electric power measurement equipment in power systems, undertake tasks such as monitoring the operating status of primary equipment and providing real and reliable electrical quantities for secondary equipment. They are important components in relay protection systems. [0003] When a traditional current transformer measures the current of a current-carrying conductor, an integrating resistor needs to be connected in series in the coil circuit of the current transformer to form an integrating circuit to measure the current of the current-carrying conductor, but the current includes power frequency current and For high-frequency current, in order to obtain high-frequency current, i...
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IPC IPC(8): G01R19/00G01R15/18
CPCG01R19/00G01R15/18
Inventor 周秀吴旭涛汲胜昌周童浩何宁辉田天刘威峰罗艳马云龙李秀广倪辉张庆平沙伟燕
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY