Testing Principle
The high-voltage switch mechanical characteristic tester adopts the four-terminal connection method for loop resistance testing, which actually measures the dynamic resistance during the switching operation, 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 graphite contact of the circuit breaker, 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 during the graphite contact operation, thereby determining the position of the metal contacts of the circuit breaker, and then inferring the true and exact position of the graphite contact based on the length of the graphite contact.
Purpose
This instrument is suitable for mechanical characteristic testing of high-voltage switches such as low-oil, multi-oil, vacuum, sulfur hexafluoride (SF6) from both domestic and imported manufacturers, and is also suitable for time testing of electromagnetic action electrical appliances (such as contactors, relays, etc.), with a built-in operating power supply.
Tester Characteristics
With the development of society, people have increasingly higher requirements for the safety and reliability of electricity use. Wuhan Zhongshi, high-voltage circuit breakers play a dual role of control and protection in the power system, and their performance directly affects the safe operation of the power system. Mechanical characteristic parameters are one of the important parameters for judging the performance of circuit breakers. High-voltage switch mechanical characteristic tester is designed based on the latest "High-voltage AC circuit breakers" GB1984-2003, and can accurately measure the mechanical dynamic characteristic parameters of various voltage levels of low-oil, multi-oil, vacuum, sulfur hexafluoride and other high-voltage circuit breakers.
Technical Parameters
Environmental group: Belongs to Group III instruments in GB6587.1-1986 "General Outline of Environmental Testing for Electronic Measuring Instruments".
1. Time measurement: 12 channels
Inherent opening (closing) time
Phase-to-phase non-simultaneity within opening (closing)
Non-simultaneity between phases for opening (closing) and bounce time (bounce count) for closing (opening)
Test range: 0.1ms ~ 999.99ms
Accuracy: 0.5%±(1% reading + 2 digits)
2. Speed measurement: Just-opening (just-closing) speed
Average speed over specified time period (stroke segment or angle segment)
Maximum speed during opening (closing)
Speed measurement range: 1mm sensor 0.01 ~ 25.00m/s,
0.1mm sensor 0.001 ~ 2.50m/s,
0.5° angle sensor 1 cycle / 0.5°
Accuracy: 1mm sensor ±(1% reading + 1 digit)
0.1mm sensor ±(2% reading + 1 digit)
0.5° angle sensor ±(1% reading + 1 digit)
3. Stroke measurement: Moving contact stroke (stroke)
Contact stroke (opening distance)
Overshoot stroke
Rebound stroke (amplitude)
Sensor: 50mm, resolution: 0.1mm
Sensor: 300mm (optional), resolution: 1mm
Angular velocity B1 sensor: 360°, resolution: 0.5°, accuracy: ±1%
4. Display: 320×240 LCD screen, contrast adjustable
5. Data storage: Can store 100 sets of measurement data
6. Printer: High-speed thermal printer
7. AC power: AC 220V ± 10%; 50Hz �� 2%
8. DC power: Output voltage: 30 ~ 260V continuously adjustable, output current: ≤15A (short time)
9. Main unit volume: 380×280×140mm
10. Operating environment: -10℃~+50℃
11. Relative humidity: ≤90%
