Self-calibration high precision AC-DC voltage divider

Abstract

The invention discloses a self-calibration high precision AC-DC voltage divider. The self-calibration high precision AC-DC voltage divider comprises a grading ring, a high voltage arm unit, a low voltage arm resistor and a foundation, wherein the high voltage arm unit comprises an inner insulation supporting cylinder, an outer insulation supporting cylinder, an outer insulation cylinder, a film type voltage division resistor arranged on an outer wall of the inner insulation supporting cylinder, and a film type clamping resistor arranged on an outer wall of the outer insulation supporting cylinder which are sequentially embedded from inside to outside, a temperature measurement probe and an AC-DC calibration instrument are further included, the temperature measurement probe is one, is fixed on the film type voltage division resistor and penetrates out of the outer insulation cylinder through a connection wire to connect with the AC-DC calibration instrument, sealing treatment on the portion of the connection wire penetrating through the outer insulation cylinder is carried out, temperature of the film type voltage division resistor is transmitted by the temperature measurement probe to the AC-DC calibration instrument in real time, and the real-time temperature of the film type voltage division resistor and the standard temperature coefficient curve of the film type voltage division resistor are contrasted by through the AC-DC calibration instrument so as to carry out self-calibration on a voltage division ratio to be a standard voltage division ratio. According to the self-calibration high precision AC-DC voltage divider, voltage division ratio precision is improved, and measurement result accuracy is guaranteed.

Description

technical field [0001] The invention belongs to the field of AC and DC voltage measurement, in particular to a self-calibrating high-precision AC and DC voltage divider. Background technique [0002] The AC-DC voltage divider is an important part of the high-voltage AC-DC voltage measurement system, and it is also a key unit in the AC-DC transmission system and sampling device. Its typical applications are in the field of high-voltage, ultra-high voltage AC and DC voltage division measurement and high-voltage laboratories. [0003] The AC-DC voltage divider consists of a voltage divider and a measuring instrument. Among them, the voltage divider adopts a balanced equipotential shielding structure, and high-quality electronic components are used inside a completely sealed insulating cylinder, so that the whole device has the advantages of accurate testing, good linearity and stable performance. [0004] However, the AC / DC voltage divider has the following defects during use...

AI Technical Summary

Problems solved by technology

[0009] The invention uses a temperature measuring probe to transmit the temperature of the membrane-type voltage dividing resistor in the high-voltage arm unit to the AC / DC calibrator in real time to calibrate the voltage dividing ratio of the voltage divider, thereby improving the precision of the voltage dividing ratio of the voltage divider and overcoming the temperature of the resistor. The non-linearity of the coefficients leads to inaccurate measurement results, which ensures the accuracy of the measurement results

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