How to carry out preventive maintenance for vacuum circuit breakers properly?
Preventive maintenance measures for vacuum circuit breakers are the key to ensure their long-term stable operation, mainly including the following aspects:
1. Equipment selection and installation
Select mature products: give priority to vacuum circuit breakers produced by reputable manufacturers to ensure that their vacuum degree, mechanical properties and other indicators meet the standards.
Integrated design: select vacuum circuit breakers with integrated body and operating mechanism to reduce maintenance complexity.
2. Regular inspection and testing
Vacuum degree detection:
Regularly use a vacuum tester to detect the vacuum degree of the vacuum bubble. The normal value should not be less than 6.6×10⁻² Pa (new equipment requires 7.5×10⁻⁴ Pa or less).
Judge the vacuum degree by observing the color of the arc: light blue arc is normal, dark red or orange-red arc indicates that the vacuum degree decreases and needs to be repaired.
Mechanical property test:
Detect travel, synchronization, bounce and other characteristics to ensure reliable operation of the circuit breaker.
The overtravel indicator can assist in judging the amount of contact wear.
Perform power frequency withstand voltage test (such as 42KV) every 3 years or so, or shorten the cycle according to the service life
Aging (voltage and current aging) can restore some performance, but it needs to be operated according to the specifications.
3. Daily operation and maintenance
Appearance inspection:
Periodically inspect the circuit breaker, pay attention to whether there is discharge outside the vacuum bubble, and whether the shielding cover is oxidized and discolored.
Contact maintenance:
Overtravel adjustment: Determine the overtravel by the change in the position of the moving guide rod and the moving end flange surface to ensure the contact pressure
Environmental protection:
Moisture and rainproof: A humid environment increases the risk of air leakage, and a waterproof cover needs to be installed and the surrounding area needs to be kept clean.
Avoid re-ignition: Old-style circuit breakers such as ZN10 should reduce load operation to avoid re-ignition caused by contact bounce.
4. Recording and Analysis
Data Statistics:
Record the limit breaking current value (Σl=n1Ir+n2Ik). When the value specified by the manufacturer is reached, the arc extinguishing chamber needs to be replaced.
Analyze the test data regularly, find abnormal trends in time and deal with them.
The above measures can effectively extend the service life of the vacuum circuit breaker and ensure the safe and stable operation of the power system.
40.5kV Vacuum Interrupter for Vacuum Circuit Breaker is produced by Shaanxi West Power Tongzhong Electrical Co., Ltd.. It is the core component of the high-voltage power switch in the 40.5kV system. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off from the power supply through the excellent insulation of the vacuum in the tube, so as to avoid accidents and accidents. It is mainly used in the power transmission and distribution control system. Assembled in an insulating cylinder or cast in epoxy resin; suitable for 35kV circuit breakers, KYN61-40.5 cabinets, etc.
It has many product advantages:
1. Strong arc extinguishing ability: In a vacuum, the arc is easy to extinguish, and the circuit can be cut off quickly and effectively, with a large breaking current.
2. High insulation level: The vacuum has good insulation performance, can withstand higher voltages, and ensure the safe operation of the circuit.
3. Long life: The internal structure is simple, and there are no problems such as oxidation that affect the life of the contacts. Both mechanical and electrical life are long.
4. Small size and light weight: It is conducive to the miniaturization and compact design of equipment.
5. Simple maintenance: basically no special maintenance is required, and the operation reliability is high.
6. No explosion hazard, no pollution: No explosion will occur during the operation, and no harmful gases or substances will be emitted, which is environmentally friendly.
7. Low noise: The noise generated during operation is very small.
Should you have any requirements in these fields, please feel free to contact us as per following information:
Email: xdtz04@westpowerelectric.com
Website: https://www.xdtzelectrical.com/
Tel:+86 917 3661109
Mobilephone(whatsapp ): +86 18091765882
