Automatic checking method for intelligent insulation parameter test instrument

Abstract

The invention discloses an automatic checking method for an intelligent insulation parameter test instrument. A detection control unit (1), controllable switches k1, k2 and k3 and a standard resistor R are adopted. When the insulation parameter test instrument is checked, firstly, the controllable switch k1 is switched off, detection programs are started for checking whether the output value of an insulation resistor of the instrument reaches the specified maximum value or not, and whether the inside of the insulation parameter test instrument is affected with damp or not is checked; then, the k1 and the K3 are switched on, the detection programs are started for checking whether the output value of the insulation resistor is zero or not, whether the test zero point of the insulation parameter test instrument drifts or not and whether the instrument is damaged or not are checked; next, the k1 and the k2 are switched on, the K3 is switched off, the detection programs are started for checking the output value of the insulation resistor, in addition, the insulation resistor is compared with a standard resistor R, and the test errors of the intelligent insulation parameter test instrument are checked.

Description

technical field [0001] The invention relates to the field of high-voltage testing, in particular to an automatic calibration method for an intelligent insulation parameter tester. Background technique [0002] Insulation resistance, absorption ratio and polarization index are the most commonly used test items for electrical equipment, but to accurately test the insulation parameters of the equipment under test, it is necessary to ensure that the instrument used is suitable and intact, such as the insulation parameter tester itself In the presence of defects, the accuracy of the test data cannot be guaranteed. [0003] The on-site measurement of the insulation resistance, absorption ratio and polarization index of the equipment under test generally uses a hand-operated or electronic megohmmeter. 0—10000MΩ, but to test the insulation resistance of the equipment under test accurately, it is required to meet the requirements from the test equipment, the equipment under test, th...

AI Technical Summary

Problems solved by technology

[0002] Insulation resistance, absorption ratio and polarization index are the most commonly used test items for electrical equipment, but to accurately test the insulation parameters of the equipment under test, it is necessary to ensure that the instrument used is suitable and intact, such as the insulation parameter tester itself If there are defects, the accuracy of the test data cannot be guaranteed

[0003] The on-site measurement of the insulation resistance, absorption ratio and polarization index of the equipment under test generally uses a hand-operated or electronic megohmmeter. 0-10000MΩ, but to test the insulation resistance of the equipment under test accurately, it is required to meet the requirements from the test equipment, the equipment under test, the test wiring, and the test method. If any link fails to meet the requirements, the test results will be affected

Especially in the insulation resistance test of high-voltage, ultra-high voltage and ultra-high voltage electrical equipment, the test voltage is generally required to be above 5000v, and the insulation resistance value of the equipment is above 2000 MΩ, which requires the test equipment itself to have high insulation performance , otherwise it will affect the test results due to the low insulation resistance of the test equipment itself

[0004] In the spring and summer in the south, it is mostly continuous rainy weather, and the air humidity is mostly above 90%. Whether it is a hand-cranked or an electronic megohmmeter, it is very easy to be damp in such an environment, which will reduce its own insulation resistance and affect it. test results

[0005] The electronic megohmmeter will cause a large experimental error due to the drift of the working point due to improper use during use.

[0006] Therefore, it is necessary to calibrate the frequently used megohmmeter to ensure the accuracy of the test data. However, the calibration of megohmmeter test equipment is generally sent to a unit with calibration qualifications for calibration every 1-2 years. The frequency of use of the megohmmeter is high and it is fragile. A fixed calibration cycle cannot guarantee the accuracy of the megohmmeter

Images