What is the core relationship between the mechanical characteristics and electrical performance of vacuum circuit breakers?
The mechanical characteristics of vacuum circuit breakers are closely related to electrical performance, and their core relationship is reflected in the opening movement characteristics, opening distance and contact pressure. The following is a key analysis:
1. Opening movement characteristics
Opening speed
The mechanical characteristics have the greatest impact on electrical performance, and the opening speed is the core indicator and mainly optimizing the movement speed within the initial 6mm to shorten the arc extinguishing time.
Influence of mechanical vibration
The arc extinguishing time of the rear opening phase is 5ms longer than that of the first opening phase. If the arcing time of the first opening phase is 4-6ms, the rear opening phase may enter the mechanical vibration zone (9-11ms), resulting in increased contact burning and affecting the electrical life.
2. Opening distance, contact pressure and opening distance design
The opening distance needs to balance the withstand voltage and breaking capacity: the opening distance of 10kV vacuum circuit breakers is usually 8-12mm, and 35kV is 30-40mm. Too small may reduce the withstand voltage level, too large will shorten the life of the bellows
Contact pressure
It is determined by the self-closing force (atmospheric pressure) and the external pressure, and it is necessary to ensure good electrical contact between the moving and static contacts.
3. The influence of mechanical characteristics on electrical performance
Breaking capacity: The cutoff value of the latter phase is a multiple of the first phase (because the metal vapor density is high in a small space), but the arcing time of the first phase is too long, which will cause the arc extinguishing environment of the latter phase to deteriorate.
Reliability: Stable mechanical characteristics can ensure the reliability of breaking and avoid electrical accidents caused by mechanical failures.
Vacuum circuit breakers need to optimize the opening speed, reasonably design the opening distance and contact pressure, and realize the coordinated optimization of mechanical and electrical performance to ensure operational reliability.
VS1-24 vacuum circuit breaker by Shaanxi West Power Tongzhong Electrical Co., Ltd. is an indoor equipment for rated voltage 24kV, three-phase AC 50Hz. It is suitable for protecting and controlling electrical equipment in industrial and mining enterprises, power plants, and substations. This type of circuit breaker conforms to national standards and IEC standards, with performance levels reaching M2-E2-C2.
The circuit breaker features composite insulated cylinder, spring energy storage operation, and screw propulsion. It is characterized by its compact size and reliable operation. Additionally, it can be easily adapted to switchgear, meeting the "Five Prevention" requirements of switchgear.
VS1-24 vacuum circuit breaker has many advantages:
1.Stability and reliability
It adopts the most mature frame-integrated spring operating mechanism, with over 20 years of market usage experience, ensuring safety, reliability, and high market recognition.
2.Excellent insulation performance
The main conductive circuit adopts APG high-strength epoxy resin composite insulated cylinder, which exceeds the IEC standard in terms of insulation performance.
For more information, 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
