In on-site withstand voltage tests of capacitive equipment such as cables and generators, operation and maintenance personnel often find that the output voltage of the equipment fails to meet the requirements of the regulations, or that insufficient measurement accuracy makes test results difficult to determine. If the selection is not based on the regulations of the region of use and the actual test object, problems such as a low voltage upper limit and inadequate accuracy are likely to occur.
Regarding the voltage upper limit, before procurement, the power regulations of the region where the equipment will be used should be clarified, and it should be confirmed that the rated voltage of the device meets the maximum test voltage of the equipment under test. Very low frequency withstand voltage tests are usually used for capacitive loads such as XLPE cables, and the test voltage level must be implemented in accordance with the regulations. An appropriate margin should be reserved during selection to avoid interruption of the test due to difficulty in voltage raising on site.
Measurement accuracy directly affects the reliability of test conclusions. The measurement accuracy of the device is 3%, and the positive and negative peak voltage errors are no greater than 3%, which can meet the basic requirements for voltage measurement in on-site withstand voltage tests. Operation and maintenance personnel should pay attention to the measurement method of peak voltage and confirm that the positive and negative peak errors are within the allowable range, so as to accurately control the test voltage.
The intelligent diagnostic function provides assistance for on-site judgment. The device supports simultaneous loading of multiple historical curves for horizontal and vertical comparison, automatically calculates relevant parameters, and provides diagnostic conclusions. Operation and maintenance personnel can use this function to compare test data of the same equipment in different periods, assist in analyzing the trend of insulation state changes, and reduce the workload of manual interpretation.
During on-site use, attention should also be paid to the wiring method and grounding reliability, the appropriate frequency should be selected according to the capacitance of the equipment under test, and environmental conditions should be recorded. Clarifying regulatory requirements and accuracy indicators during the selection stage, and evaluating operational convenience in combination with diagnostic functions, will help improve the efficiency and traceability of on-site withstand voltage tests.
