Electronic voltage transformer using data fusion technology and error calibration method thereof

Abstract

The invention discloses an electronic voltage transformer using data fusion technology and an error calibration method thereof. The error calibration method comprises the following steps of: acquiring a secondary measured voltage by using a capacitive voltage divider and a sampling resistor R, accessing the voltage to a data acquisition processor for sampling, and tracing the frequency of the voltage; accessing a signal of a temperature sensor to the data acquisition processor, and computing the temperatures of measuring points; dynamically computing a divided voltage ratio of the capacitive voltage divider according to the temperature variation of the measuring points by using data acquisition device processing software so as to modify a transformation ratio error of the transformer; dynamically computing phase deviation according to signal frequency variation by using the data acquisition device processing software so as to modify a phase error; and outputting a digital sampling value through an optical fiber interface. The device is simple in structure, safe and practical; errors caused by manufacturing factors, temperature and signal acquisition circuits and the like can be effectively modified and restrained; and the measuring accuracy, temperature stability and transient performance of the electronic voltage transformer according to a capacitive voltage division principle are improved.

Description

technical field [0001] The invention relates to a device for measuring primary voltage of a power system. The device uses a capacitive voltage divider as a voltage sensor to obtain a small voltage signal that can be measured, and through various digital signal processing technologies such as data fusion, the output is in phase with the measured primary voltage. , The amplitude is proportional to the digital signal of the measured primary voltage. Background technique [0002] Capacitive voltage transformers (CVT for short) are mostly used for voltage measurement of 110kV and above voltage levels in traditional outdoor fields, which are mainly composed of capacitive voltage dividers and electromagnetic units, such as Figure 5 As shown, the capacitive voltage divider includes high-voltage arm capacitor C1 and low-voltage arm capacitor C2; the electromagnetic unit includes intermediate transformer T, compensation reactor L, damper Zz, and protection gap G, and has a load impeda...

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Problems solved by technology

For example: the influence of the atmospheric environment on the stability of the measurement accuracy, the phase shift of the output signal of the primary sensor head, the transient characteristics of the electronic transformer, etc., the above factors have affected the promotion of this type of electronic voltage transformer to a certain extent application

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