Q: What parameters does the on-load tap changer tester mainly measure?
A: The instrument is used to measure the transition resistance, transition time, three-phase simultaneity, and switching waveforms of on-load tap changers. The transition resistance measurement range covers the 1A range: 0.4Ω～20Ω, the transition time measurement accuracy can reach 0.1ms, the three-phase simultaneity accuracy is 0.1ms, and the three-phase waveform display accuracy is 0.3ms, which can reflect the electrical characteristics of the switch switching process.
Q: What are the requirements for power supply and environment during on-site use?
A: The working power supply is AC220V±10%, and the ambient temperature adaptation range is -10℃～50℃, suitable for conventional environments such as substation sites and maintenance workshops. The internal design of the instrument takes anti-interference measures into consideration, allowing it to work stably in occasions with electromagnetic interference.
Q: Why is the transition resistance measurement divided into ranges? How to choose?
A: On-load tap changers of different voltage levels and capacities have greatly different transition resistance values. The instrument provides measurement ranges such as the 1A range (0.4Ω～20Ω). During procurement, an appropriate range can be selected according to the nominal transition resistance value of the switch under test to ensure measurement resolution and accuracy. If other current ranges are required, they can be confirmed according to actual needs.
Q: How does the waveform display function help in judging the switch status?
A: The three-phase waveforms can intuitively show the corresponding relationship between resistance and time during the switching process of each phase, making it easy to discover problems such as asynchronous contact action, abnormal transition resistance, or excessive switching time. Combined with the simultaneity data, a comprehensive evaluation of the mechanical and electrical performance of the switch can be made.
Transition resistance measurement: 1A range 0.4Ω～20Ω; transition time accuracy: 0.1ms; three-phase simultaneity accuracy: 0.1ms; three-phase waveform accuracy: 0.3ms; ambient temperature: -10℃～50℃; working power supply: AC220V±10%.
Suitable for routine maintenance, handover acceptance, and fault diagnosis of transformer on-load tap changers in power systems, and can also be used for factory tests by switch manufacturers. Procurement personnel can check whether the range and accuracy cover the equipment under their jurisdiction based on the actual testing needs of the team.
