A self-calibrating high-precision AC-DC voltage divider

Abstract

The invention discloses a self-calibrating high-precision AC-DC voltage divider, which includes a voltage equalizing ring, a high-voltage arm unit, a low-voltage arm resistor, and a base. The outer cylinder, the insulating outer cylinder, the film-type voltage dividing resistors arranged on the outer wall of the insulating support inner cylinder and the film-type clamping resistors arranged on the outer wall of the insulating support outer cylinder also include a temperature measuring probe and an AC / DC calibrator for temperature measurement One probe is fixed on the membrane-type voltage dividing resistor and is connected to the AC / DC calibrator through the connecting wire through the insulating outer cylinder. The part where the connecting wire passes through the insulating outer cylinder is sealed. The temperature measuring probe The temperature of the film voltage dividing resistor is transmitted to the AC / DC calibrator in real time, and the AC / DC calibrator compares the real-time temperature value of the film voltage dividing resistor with the standard temperature coefficient curve of the film voltage dividing resistor, so as to self-calibrate the voltage dividing ratio as the standard partial pressure ratio. The invention improves the accuracy of the voltage division ratio of the voltage divider and ensures the accuracy of the measurement results.

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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