A wide voltage power signal voltage detection device

Abstract

The invention discloses a wide-voltage power signal voltage detection device, which includes a signal attenuation circuit, an AC-DC conversion circuit, an automatic classification control circuit and a strong voltage signal detection circuit, and the AC voltage signal is passed through the signal attenuation circuit and the AC-DC conversion circuit. After attenuation, it is converted into a DC signal. The automatic stepping control circuit includes N-1 groups of amplification / attenuation devices and voltage comparators. Each amplification / attenuation device is amplified / attenuated according to the reference voltage value of the corresponding voltage comparator and the corresponding voltage range. Multiples, each amplification / attenuation device receives the DC signal for amplification / attenuation processing, the voltage comparator compares the attenuated DC signal with the reference voltage signal, outputs the control signal, and realizes classification, and the strong voltage signal detection circuit is based on the control signal. Set the current gear, and detect the AC voltage signal to obtain the voltage value. The invention can realize voltage detection of wide voltage, adopts pure hardware shifting, has fast shifting speed and high reliability.

Description

technical field [0001] The invention belongs to the technical field of voltage detection, and more specifically relates to a wide voltage power signal voltage detection device. Background technique [0002] In the power system, traditional high-voltage detection devices use oil-immersed voltage transformers, gas-insulated voltage transformers, and capacitive voltage transformers. This type of voltage transformer is deeply affected by oil leakage, air leakage, moisture infiltration, iron core saturation, ferromagnetic resonance, etc., resulting in low reliability and poor safety. At the same time, the accuracy will decrease due to the change of ambient temperature and the extension of running time. [0003] With the development of technology, there have been devices that use electronic voltage transformers and Hall voltage sensors to measure voltage. Now list the parameters of two mainstream products. The parameters of a certain type of current voltage transformer TV19E ar...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the above two devices cannot be used to measure the peak voltage in high voltage, and the dynamic range of the measured voltage is small, and the electronic voltage transformer also has the disadvantage of large phase shift

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