The four-terminal wiring method used in loop resistance testing is actually to test the dynamic resistance during the switching action of the circuit breaker, which 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 contacts 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 action of the graphite contacts, thereby determining the position of the metal contacts of the circuit breaker, and then inferring the true and exact position of the graphite contacts based on the length of the graphite contacts.
Safety Requirements:
1. Only qualified technicians should perform maintenance to prevent fire or personal injury.
2. Use appropriate power cords. Only use power cords that are dedicated to this product and comply with its specifications.
3. Connect and disconnect correctly. Do not arbitrarily connect or disconnect test leads when they are connected to live terminals.
4. Ground the product. In addition to grounding through the ground wire of the power cord, the grounding terminal on the product housing must be grounded. To prevent electric shock, the grounding conductor must be connected to the ground. Ensure the product is properly grounded before connecting to its input or output terminals.
5. Pay attention to all terminal ratings. To prevent fire or electric shock hazards, pay attention to all ratings and markings of the product. Before connecting to the product, read the product manual to further understand the rating information.
6. Do not operate without the instrument cover. Do not operate the product if the cover or panel has been removed.
7. Use appropriate fuses. Only use fuses that comply with the specified type and rating of the product.
8. Avoid contact with exposed circuits and live metal. Do not touch exposed contacts and parts when the product is energized.
9. Do not operate if there is a suspected fault. If the product is suspected to be damaged, have it inspected by maintenance personnel and do not continue to operate.
10. After testing, wait for discharge to complete before removing test leads.
Product Introduction:
It is a new type of special instrument for detecting the mechanical dynamic characteristics of high-voltage circuit breakers. The High-Voltage Switch Dynamic Characteristic Tester adopts high-tech technology, integrating a computer, printer, measurement interface circuit, and operating power supply into one unit. It is a new special instrument for high-voltage circuit breaker detection. It is equipped with two displacement sensors suitable for different distances and precision testing. The instrument's automatic identification system identifies the selected sensor, completing distance and speed measurement for low-oil, multi-oil, sulfur hexafluoride, and vacuum high-voltage circuit breakers. In the design of the instrument, only one closing (opening) action is needed to sample and record all data of six break contacts. The measurement results can be displayed with a single key operation, and the measurement data can be printed, including current waveform diagrams of six break contacts and the time characteristic curve of the moving contact of one break.
It is a universal computer-based intelligent testing instrument developed for various high-voltage switches. The high-voltage switch characteristic tester applies photoelectric pulse technology, single-chip computer technology, and reliable anti-electromagnetic radiation technology, equipped with precise and reliable speed/distance sensors. It can be used for the adjustment and measurement of mechanical parameters of various voltage levels of vacuum, SF6, low-oil, multi-oil, and other high-voltage switches. The instrument is convenient for wiring and simple to operate. Only one closing (opening) action is needed to obtain all closing (opening) data. It can print all required data, break contact current waveforms, and moving contact motion curves, which is convenient for analysis and storage.
Product Applications:
The High-Voltage Switch Dynamic Characteristic Tester is suitable for mechanical characteristic testing of imported and various manufacturers' low-oil, multi-oil, vacuum, SF6, and other high-voltage switches. It is also suitable for time testing of electromagnetic action devices (such as contactors, relays, etc.), and comes with its own operating power supply.
Product Features:
- ● Inherent opening and closing times of 12 break contacts;
- ● Reclosing time;
- ● Maximum non-simultaneity of opening and closing;
- ● Just-opening and just-closing speeds;
- ● Bounce time and amplitude;
- ● Switch opening distance and overtravel (for vacuum switches, preset switch travel);
- ● Average opening and closing speeds;
- ● Display and print speed-distance curves
Technical Specifications:
1. Time Measurement
Time measurement range: 10ms-1000ms
Number of break contacts measurable simultaneously: ≤12
Setting time for measurement process: 0~6 seconds
Resolution: 0.1ms
2. Switch Opening Distance, Overtravel, and Bounce Amplitude Measurement
Range: ＜500mm
Resolution: 1mm
3. Measurement Error
Time measurement error: ±1%
Travel measurement error: ±1%
4. Working Conditions
Working voltage: AC220V±10%
Frequency: 50HZ
Power consumption: ≤60W
Operating ambient temperature: 0~40℃
Operating ambient humidity: ≤90%RH
Dimensions: 400×350×200(mm3)
Weight: 7kg
