Sensor device for monitoring transient voltage of broadband integral type power grid

Abstract

The invention relates to a sensor device for monitoring the transient voltage of a broadband integral type power grid, which is characterized in that the sensor device is connected with a sensor (1), a grounded resistor (2), a voltage follower (3), an integral circuit (4), an opposite-phase amplifying circuit (5), a filter circuit (6), an over-voltage protecting circuit (7) and an impedance matching circuit (8) connected in sequence to form a signal circuit (9); the signal circuit (9) is connected with a PCI (Peripheral Component Interconnect) capture card through a transmission cable (11); the filter circuit (6) is connected with the PCI capture card through a transmission cable (11); the filter circuit (6) is connected with the PCI capture card through a transmission cable (12) after through a triggering circuit (10); the sensor (1) is a high-frequency current magnet balance Hall sensor, wherein the frequency band trait thereof is selected between DC and 500 kHz(-3dB), the load impedance thereof is selected between 50 and 160 omega, and the operating voltage thereof is DC12V. The design only comprises some electronic elements; the sensor device has the advantages of lower cost, smaller volume, and more convenience for spot installation without considering floor space.

Description

Technical field [0001] The invention is a wide-band integral type power grid transient voltage monitoring sensor device, which is used for real-time monitoring and capture of transient voltage in the power grid, and belongs to the technical field of power quality transient voltage detection. Background technique [0002] With the expansion of power grid capacity and the increase of various non-linear loads, the power grid becomes more complex and new problems continue to increase, which brings difficulties to the analysis and judgment of accidents in the power system. Transient (transient) voltage disturbance means that the sinusoidal waveform of the power supply voltage is distorted by the transient (transient) voltage disturbance, causing various problems of pollution of power quality. Transient power quality problems are characterized by frequency spectrum and transient duration, and are generally divided into two types: pulse transient and oscillating transient. In the power...

AI Technical Summary

Problems solved by technology

This method is simple in structure, but has the following disadvantages: (1) The frequency band of PT is narrow, usually about 20kHz, and it is difficult to obtain the high-frequency part of transient voltage; (2) The sampling rate of ordinary power quality analyzers is 800Hz, so it is difficult Obtain high-frequency transient voltage, especially for some instantaneous voltage processes in some power grids, such as high-speed locomotives (transient loads), lightning and other processes are difficult to capture; (3) It may cause the disconnection of the grounding wire of the last screen, resulting in discharge of the last screen

However, the disadvantage of the above technology is that in the high-voltage power grid, the long-term operation of the voltage divider in parallel with the bus will bring many potential risks to the system

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