High voltage switch characteristic tester is designed based on the latest "High Voltage AC Circuit Breakers" GB1984-2003, capable of accurately measuring various voltage levels of low-oil, multi-oil, vacuum, SF6 and other high voltage circuit breakers' closing (opening) sequence, maximum closing (opening) time, three-phase non-simultaneity, same-phase non-simultaneity, closing (opening) time, action time, bounce time, bounce count, bounce amplitude, travel, open distance, overtravel, overtravel, just-closing (opening) speed, maximum speed, average speed, gold short time, no-current time, current waveform curve (dynamic), time-travel speed dynamic curve (ms), time-travel speed dynamic curve (mm) and other mechanical dynamic characteristic parameters.
Technical Parameters of the Instrument
>Time test range: 1—499.9ms Resolution: 0.01ms Accuracy ≤0.1ms
>Speed test range: 15ms Resolution: 0.01m/s Accuracy ±1% of reading + 2 digits
>Travel test range: Unlimited Resolution: 0.01mm Accuracy ±1% of reading + 2 digits
>DC power supply selection range: 25-265V/10A Resolution: 1V Accuracy ≤±1%
>Working power supply: AC220V ±10% Frequency: 50Hz ±5%
>Ambient temperature: -10°C~40°C Relative humidity: ≤85%
>Insulation resistance: ≤2MΩ
>Dielectric strength: The power input line to the casing can withstand a withstand voltage test of 1.5KV for 1 minute.
Testing Principle
The high voltage switch mechanical characteristics tester adopts the four-terminal connection method for loop resistance testing, which actually tests the dynamic resistance during the switch operation process, and can be used to test SF6 high voltage circuit breakers with graphite contacts. The working principle of the dynamic resistance test channel is to load a 10A constant current source on the two terminals of the circuit breaker's graphite contacts, and through the other two test signal lines (voltage signals) connected to both ends of the circuit breaker, test the dynamic voltage change waveform within 200mV when the graphite contacts operate, thereby determining the position of the metal contacts of the circuit breaker, and then infer the true and exact position of the graphite contacts based on the length of the graphite contacts.
