Whether the operating state of the power capacitor is normal directly affects the final effect of reactive power compensation and the stability of the power system, so learning to detect the quality of the power capacitor is also a skill that the relevant staff must master.
In today's article, Xiaoku will introduce you to how to detect the quality of power capacitors, come and learn Xi!
1.Perform a visual inspection
Checking the appearance is the basic method to detect the quality of power capacitors, mainly to check the capacitorsWhether there is visible damage to the outside, whether there are cracks, bulges, oil leakagesituation.
Also, check the links sectionWhether there is loosening or corrosion, whether the contact is good.
2.Perform a circuit check
By using test instruments such as digital multimeters and LCR meters, the two ends of the capacitor are measured separately when the capacitor circuit is disconnectedVoltage, resistance, capacitanceand other parameters to judge whether the capacitor is working properly.
3.Conduct insulation tests
Insulation test is an important means to judge the insulation performance of power capacitors. You can use the insulation resistance tester or the insulation test function of a multimeter to electricalInsulation resistance between the container and the groundTake the test.
Capacitors are usually requiredThe insulation resistance should be greater than a certain thresholdOtherwise, the capacitor has poor insulation performance and may be faulty.
4.Conduct a capacity test
Capacitor capacitance testing is required using dedicated capacitor capacity test equipment or a digital multimeter to compare the test results with the capacitor calibration value, and if the difference is large, it may be presentCapacitor capacity decreasesIf the capacitance drops to a certain level, it represents a power capacitorLapse
5.Perform an operating temperature test
Whether the operating temperature of the power capacitor is normal is one of the important indicators to judge the operating status of the capacitor, and the staff can use itInfrared thermometer or contact thermometerA test is carried out to measure the temperature on the surface of the capacitor housing.
If the capacitor surface temperatureUnusually high or unusually low, there may be an internal fault or an abnormal working condition.