Importance of instantaneous overcurrent protection
Instantaneous overcurrent protection is one of the most basic and important current protection methods in power systems. Its core characteristics are: fast action and no delay.
The function of instantaneous overcurrent protection: In the event of a severe short circuit, it disconnects the circuit as quickly as possible to protect equipment and personnel. Without instantaneous overcurrent protection, an 8000A current lasting 0.5 seconds would burn out a cable.
The operating principle of instantaneous overcurrent protection = Real-time current monitoring → Once the set value is exceeded → Direct tripping without delay
Why is instantaneous overcurrent protection needed?
1- Protects equipment from burnout
If not quickly disconnected, cables will melt within seconds, and transformers/generators will be reduced to scrap metal.
2- Prevents the escalation of accidents
If a short circuit is not disconnected in time, it will affect upstream equipment
Potentially causing cascading tripping → Power outage of the entire busbar → Large-scale power outage
Instantaneous overcurrent protection limits the fault to a minimum
3- Ensures personal safety
Instantaneous overcurrent protection trips before danger occurs, reducing the risk of casualties.
Why Choose Us
XDTZ's vacuum circuit breakers have an operating time of less than 50 milliseconds, perfectly complementing relay protection devices to achieve instantaneous overcurrent protection. "As long as the protection device sends a signal, the circuit breaker can instantly interrupt the fault current."
"XDTZ's vacuum circuit breakers have a fast response speed and can fully cooperate with relay protection to achieve instantaneous tripping function."
Here is our special vacuum circuit breaker for underground mining
VTZ-12GD-MT vacuum circuit breaker combination electrical appliance is a special vacuum circuit breaker for underground mining with rated voltage of 12kV and AC 50/60Hz.
It adopts permanent magnet mechanism and has mechanical manual closing and opening functions.
It is suitable for various places with explosion-proof requirements for power facilities.
The trolley unit is used in conjunction with PJG9-10 switch cabinet.
Contact Us
Contact: Miss Melody
Email: xdtz03@westpowerelectric.com
Mobile: +86 180 9176 5658 (WhatsApp/Wechat)
