Capacitance sensor calibration system for measuring very fast transient overvoltage (VFTO)

Abstract

The invention provides a capacitance sensor calibration system for measuring very fast transient overvoltage (VFTO), which comprises a high voltage steep pulse generator, a conical transmission cylinder, a capacitance sensor, a resistance voltage divider, coaxial cables, a first oscilloscope and a second oscilloscope, wherein the high voltage steep pulse generator is used for generating high voltage steep pulse; the high voltage steep pulse is transmitted to the capacitance sensor and the resistance voltage divider which are arranged in a gas insulated metal-enclosed switchgear (GIS) by the conical transmission cylinder; the conical transmission cylinder is coaxially connected with the GIS; the resistance voltage divider transmits a resistance partial voltage signal to the first oscilloscope by means of the coaxial cable; and the capacitance sensor transmits the capacitance partial voltage signal to the second oscilloscope by means of the coaxial cable. The calibration system takes the high voltage steep pulse generator as a signal source so as to better accord with the actual waveform of the VFTO; and in addition, the capacitance sensor and the resistance voltage divider are arranged on the cylinder of the GIS, thus the calibration system can calibrate the capacitance sensor under the approximately actual installation condition.

Description

technical field [0001] The invention relates to the technical field of capacitive sensors, in particular to a capacitive sensor calibration system for fast transient overvoltage measurement. Background technique [0002] The capacitive sensor calibration system for VFTO (Very Fast Transient Over-voltage) measurement is to detect whether the performance of the capacitive sensor meets the requirements and determine the voltage division ratio of the capacitive sensor. [0003] The existing calibration system of capacitive sensor commonly used for VFTO measurement is as follows: figure 1 As shown, a steep pulse generator 101 , a coaxial cable 102 , an attenuator 103 , a capacitive sensor 104 , a first oscilloscope 105 and a second oscilloscope 106 are included. Its working principle is that the steep pulse generator 101 is used as a signal source to generate voltage pulses, and the voltage pulses are transmitted to the attenuator 103 and the capacitance sensor 104 through the c...

AI Technical Summary

Problems solved by technology

[0004] However, at present, the voltage generated by the steep pulse generator in the capacitive sensor calibration system for VFTO measurement is not high enough and the steepness is not high enough to simulate the environment where VFTO occurs

Moreover, the existing calibration system does not use gas-insulated metal-enclosed switchgear (GIS, Gas Insulated Switchgear), but there must be GIS knife switch operation in the actual system, the existing technology only uses a steep pulse generator to simulate the GIS knife The pulse waveform generated by the gate operation is far from the actual system in amplitude and steepness

Therefore, the capacitive sensors calibrated in the low-voltage environment in the prior art cannot be applied to the actual high-voltage system, and the capacitive sensors calibrated in this way cannot meet the requirements of VFTO response time

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