Method for measuring high voltage and high resistance by means of ratio overlaying
A high-voltage, high-resistance technology, applied in the direction of measuring current/voltage, measuring resistance/reactance/impedance, measuring electrical variables, etc., can solve the problems of cumbersome wiring and low accuracy
Active Publication Date: 2012-09-12
INNER MONGOLIA INST OF METROLOGY TESTING & RES
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[0002] At present, in the process of measuring high resistance and high voltage in electrical measurement, high-resistance bridges and high-voltage voltage dividers are mainly used. These instruments are used for detection, and the wiring is cumbersome and the accuracy is low.
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[0008] Combine below figure 1 , figure 2 An embodiment of a DC high-voltage high-resistance measuring device used in this method is described in detail, but the claims of the present invention are not limited in any way.
[0009] The method of measuring high voltage and high resistance in this ratio superposition method refers to the high-accuracy ratio standard K1 of which all electrical parameters are known in electrical measurement, superimposed on the known low-voltage arm reactance value Z Δ In the ratio standard K2, the impedance of the high-voltage arm of the two ratio standards is connected in series to form Zx+Z 1 , the impedance of the two low-voltage arms is also connected in series to form Z 2 +Z Δ , forming a new ratio standard K 1+2 , when the ratio standard K 1+2 When the voltage Vx applied to the input end of the high-voltage arm or the unknown reactance value Zx of the high-voltage arm needs to be measured, the ratio standard K 1+2 The mathematical equa...
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The invention discloses a method for measuring high voltage and high resistance by means of ratio overlaying, comprising the following steps of: overlaying high-accuracy ratio standards of all known electric parameters in a ratio standard of only-known low-voltage arm reactance value to form a new ratio standard, and when a voltage Vx value applied to an input end of a new ratio standard high-voltage arm or an unknown reactance value Zx of the high-voltage arm needs to be measured, measuring practical values of Vx and Zx due to the measurement that the ratio of the new ratio standard is overlaid with the front and low low-voltage arm output voltage and the computation of a mathematical equation set formed by the known electric parameter; and adjusting a low-voltage arm circuit parameter of the new ratio standard, so that the low-voltage arm output voltage values before and after being overlaid with the ratio standard can be equal to one another, and practical values of Vx and Zx can be measured, and therefore, the method can be used for the design manufacture of a novel precision high resistance meter, a high-voltage voltage-dividing ratio metering standard, and an online self-calibration high-voltage voltage divider in high-voltage power transmission.
Description
technical field [0001] The present invention relates to a method for measuring high resistance and high voltage, in particular to a method for measuring high resistance and high voltage when used in electrical measurement, using the ratio superposition method to transfer value from high-level standards to low-level standards . Background technique [0002] At present, in the process of measuring high resistance and high voltage in electrical measurement, high-resistance bridges and high-voltage voltage dividers are mainly used. These instruments are used for detection, and the wiring is cumbersome and the accuracy is low. It is urgently needed by the metrology department to study a measurement method with simple wiring and high accuracy. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for measuring high voltage and high resistance by ratio superposition, which is a high resistance and high voltage measu...
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Login to View More IPC IPC(8): G01R19/00G01R27/02
Inventor 呼和闫立新吕金华
Owner INNER MONGOLIA INST OF METROLOGY TESTING & RES