In mechanical characteristic tests of 10kV～35kV circuit breakers, the closing voltage range and time parameter measurement accuracy are core indicators of concern for selection personnel. Taking a common spring operating mechanism as an example, the rated voltage of the closing coil is usually DC220V or DC110V, and the tester output voltage needs to cover the range of ≌100～300V to meet the opening and closing operation requirements of switches at different voltage levels. If the range is too narrow, some old or special models of operating mechanisms may not be driven on site.
Question: What is the significance of measuring 12 breaks simultaneously?
Answer: High-voltage circuit breakers are mostly three-phase split structures, and each phase may contain multiple series-connected breaks. In one opening or closing operation, the breaks are not strictly synchronized, and the non-simultaneity within the same phase and between phases directly affects the breaking capacity and overvoltage level. A tester with 12-break acquisition capability can record the inherent opening/closing time, reclosing time, and arcing short time of all breaks in one operation, avoiding state changes introduced by multiple operations.
Question: How can the reliability of the tester output power supply be confirmed?
Answer: Before each use, check whether the output voltage and current displays are normal. If the power module is abnormal, the opening and closing coils may not operate fully, causing distortion of time parameters. During selection, attention can be paid to whether the equipment has output self-check or abnormality prompt functions to reduce the risk of on-site misjudgment.
Question: What engineering value do reclosing time and arcing short time measurements have?
Answer: Reclosing time reflects the interval before the circuit breaker recloses after protection operation, while arcing short time reflects the duration of pre-breakdown and arcing during the closing process. Both have reference significance for system stability and equipment life. During selection, it is necessary to confirm that the tester can automatically calculate and distinguish these parameters, rather than only displaying raw waveforms.
