The Method of Measuring the Insulation Resistance of Transmission Lines in the State of Strong Interference
A technology for transmission lines and insulation resistance, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as inability to measure insulation resistance
Active Publication Date: 2019-01-25
JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +1
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Problems solved by technology
[0003] The present invention aims to solve the problem that the insulation resistance cannot be measured under the condition of strong interference on site, and provides a method for measuring the insulation resistance of transmission lines under the condition of strong interference
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Embodiment Construction
[0011] As shown in the figure, the method of measuring the insulation resistance of transmission lines in the state of strong interference is as follows:
[0012] 1. Use a voltage regulator T and a voltage booster B. The input terminal of the voltage regulator T is connected to a 220V AC power supply, and the output terminal of the voltage regulator T is connected to the low-voltage side of the voltage booster B, and connected in parallel to the low-voltage side of the voltage booster B. The voltmeter V and the high-voltage side of the booster B are connected to the head end of the tested circuit Cz through the high-voltage silicon stack D and the microampere meter μA;
[0013] 2. Adjust the low-voltage side voltage of booster B through the voltage regulator T connected to the 220V AC power supply, and read the voltage value of the low-voltage side of booster B through the voltmeter V connected in parallel to the low-voltage side of booster B. The transformer B transformation ...
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The invention provides a transmission line insulation resistance measurement method under strong interference. The method comprises the steps that a voltage regulator T is used to adjust the voltage of the low voltage side of a booster B; a voltmeter V is used to read the voltage value of the low voltage side of the booster B; according to the booster B ratio, the voltage value of the high voltage side of the booster B is determined; the tail end of a measured line Cz is open; a high voltage silicon stack D is used to apply direct current voltage of 30,000 to 50,000 volts on the head end pf the measured line Cz; a microampere meter mu A is used to read a leakage current value i; and a calculation value which is acquired through a formula R=u / i is the insulation resistance value of the measured line Cz. According to the invention, a leakage current measuring method is used; the direct current voltage which is much higher than the output voltage of an insulation resistance meter is applied on the measured line; the leakage current is read; the insulation resistance value is calculated through the formula; and the problems that the insulation resistance cannot be measured and the insulation resistance meter is burned, which is caused by large induction voltage and induction current and small output current of the insulation resistance meter, are prevented.
Description
technical field [0001] The invention relates to a method for measuring the insulation resistance of a power transmission line in a state of strong interference. Background technique [0002] Before the new high-voltage transmission line is put into operation, the insulation condition of the line should be checked, and the insulation resistance meter is usually used to measure the insulation resistance. However, in a 500kV substation, when measuring 220kV and above transmission lines, due to the electromagnetic coupling and electrostatic coupling between the adjacent running lines in the substation and the tested line, the induced voltage and induction on the tested line Current, when the test line of the insulation resistance meter is connected to the line under test, because the induced voltage and current are very large, and the current output by the insulation resistance meter is small, the insulation resistance cannot be measured or even the insulation resistance meter ...
Claims
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IPC IPC(8): G01R27/08
Inventor 褚秀红王爱民许景新韩飞朱毅
Owner JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY