A Standard DC Voltage Divider with Floating Low Voltage Terminal

Abstract

The present invention provides a low-voltage terminal standard direct current voltage divider. The voltage divider comprises an insulation outer barrel, grading rings and first flanges being respectively and coaxially installed at two ends of the insulation outer barrel, a measurement resistor and a shielding resistor being coaxially installed at two ends in the insulation outer barrel, and the measurement resistor is connected in series with a low-voltage arm resistor and then is connected in parallel with the shielding resistor; a second flange without grounding is coaxially fixed on the insulation outer barrel between the grading rings and the first flanges, the low-voltage end of the low-voltage arm resistor is connected with the second flange, a support plate configured to support a data collection unit and a wireless transmission unit is fixed on the second flange, the data collection unit collects the voltage on the low-voltage arm resistor and sends the voltage to an upper machine through the wireless transmission unit. The low-voltage terminal standard direct current voltage divider is high in accuracy and good in reliability and can measure the voltage of charging capacitors with different stage numbers in an impact voltage generator.

Description

technical field [0001] The invention relates to a voltage divider, in particular to a standard DC voltage divider whose low-voltage end does not contact the ground. Background technique [0002] With the continuous development of UHV transmission technology and the increase of the voltage level of the transmission line, the voltage level of the impulse voltage generator and the voltage divider used to measure the output voltage of the impulse voltage generator has also been greatly increased to meet the impulse voltage withstand test of the equipment Require. The Provincial Electric Power Research Institute has basically established a 3600kV impulse voltage test and measurement system, and the UHV AC test base, UHV DC test base and high altitude base have even established a 7500kV impulse voltage test and measurement system. However, the voltage divider used in the current impulse voltage test and measurement system is limited by the voltage of the standard measurement syst...

AI Technical Summary

Problems solved by technology

However, the voltage divider used in the current impulse voltage test and measurement system is limited by the voltage of the standard measurement system, so it can only be calibrated within 1000kV to obtain the voltage division ratio within the 1000kV voltage range of the impulse voltage divider, so the calibrated voltage divider The measurement accuracy of the device in the voltage range above 1000kV cannot be guaranteed

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