Grid overvoltage signal detection method and system
A technology of signal detection and overvoltage, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve problems such as changing wiring mode, adding primary electrical equipment, power grid accidents, etc., to prevent overvoltage damage, good electromagnetic Compatible features and protective measures, good insulation performance
Active Publication Date: 2015-08-05
国网重庆市电力公司綦江供电分公司 +1
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The conventional overvoltage monitoring method uses a voltage divider or an overvoltage divider connected to the end screen of the bushing, adding primary electrical equipment or changing the wiring method, which may cause a grid accident in the event of a sensor failure
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[0046] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.
[0047] figure 1 The flow chart of the grid overvoltage signal detection method provided by the embodiment of the present invention; as shown in the figure: the grid overvoltage signal detection method provided by the present invention includes the following steps:
[0048] S1: Connect the capacitive sensor between the grid bus and the ground,
[0049] S2: Connect the low-frequency current sensor between the capacitive sensor and the ground wire, and obtain the voltage signal in the grid bus,
[0050] S3: After processing the voltage signal and judging whether it exceeds the preset voltage threshold, if the amplitude of the voltage signal exceeds the preset voltage thre...
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The invention discloses a detection method and a detection system for detecting an overvoltage signal of a power grid. The detection method comprises the following steps of: firstly, connecting a capacitive sensor between a power grid bus and a ground wire; then acquiring a voltage signal in the power grid bus by a low frequency current sensor; and finally, processing the voltage signal and judging whether the voltage signal is the overvoltage signal and automatically acquiring, transmitting and storing the overvoltage signal. The detection system comprises the capacitive sensor, a current sensor, an integrating circuit, an amplification circuit, a signal conditioning waveform reconstructing and triggering unit, a signal acquisition unit and a data transmission and storage system. According to the invention, the capacitive voltage sensor is adopted to acquire a current signal; the detection system is not directly electrically connected with power grid primary equipment, has good insulation performance and does not influence the safety operation of the power grid; the primary wire connection of the electrical equipment is not changed; and the overvoltage is reconstructed by the current and the overvoltage waveform is automatically recorded in real time. The detection system has excellent electromagnetic compatibility and protection measures; a measurement system is prevented from being damaged by the overvoltage; and the thunder and lightning are not introduced into a mains supply system.
Description
technical field [0001] The invention relates to a method and a device for detecting grid voltage in real time, in particular to a method and system for detecting an overvoltage signal of a grid. Background technique [0002] Power grid overvoltage is an important hidden danger that affects the operation safety of transmission lines and substation equipment, and has a great impact on the safety of transmission lines and equipment. Real-time monitoring of system overvoltage, realizing the acquisition of power grid operation status, facilitating accident analysis and electrical equipment insulation coordination. The conventional overvoltage monitoring method uses a voltage divider or an overvoltage divider connected to the end screen of the bushing, adding primary electrical equipment or changing the wiring method, which may cause a grid accident in the event of a sensor failure. [0003] Therefore, there is an urgent need for a method and a device that can detect whether the ...
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IPC IPC(8): G01R19/165
Inventor 席世友杜林
Owner 国网重庆市电力公司綦江供电分公司