Abstract
The resistance and capacitance parameters of a resistance–capacitance divider may change due to factors such as long-term operation, internal insulation flashover, and dielectric breakdown, which will affect the measurement characteristics of the resistance–capacitance divider. Since it is difficult to separate the voltage divider, and because improper disassembly will damage the insulation of the equipment, measuring the resistance and capacitance parameters of a voltage divider non-destructively has always been a problem. In this paper, an indirect method for evaluating the resistance and capacitance parameters is proposed, and the uncertainty of measurement of this method is determined. Simulation and actual test results show that this method can be used to estimate the resistance–capacitance parameters and has a good level of measurement accuracy. Besides, through the uncertainty analysis, it is concluded that the proposed method can overcome measurement errors within a certain range and has high practicability. Finally, a very practical application scenario of the proposed method is given, showing that the proposed method has good economic significance.
Highlights
The voltage divider is the key piece of equipment in high-voltage direct current (HVDC) transmission systems
Capacitance-type divider is usually used to prevent component breakdown caused by uneven local voltages in the resistance voltage divider under the impulse voltage scene [8,9]
Since it is difficult to separate the voltage divider, and because improper disassembly will damage the insulation of the equipment, measuring the resistance and capacitance parameters of a voltage divider which is put into operation has always been a problem
Summary
The voltage divider is the key piece of equipment in high-voltage direct current (HVDC) transmission systems. Since it is difficult to separate the voltage divider, and because improper disassembly will damage the insulation of the equipment, measuring the resistance and capacitance parameters of a voltage divider which is put into operation has always been a problem. The resistance and capacitance parameters of DC voltage dividers may change due to internal insulation flashover and dielectric breakdown during their operation. Chen put forward a capacitance measurement method that can be completed without disconnecting the lead wire In this method, the upper end of the high-voltage arm is grounded, and the lower end is connected to the test voltage. This paper proposes a measurement method of resistance–capacitance parameters of voltage divider without disassembly and analyzes the measurement uncertainty of this method
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