Scope of Application
ZW3₂-1₂F Outdoor High-Voltage Vacuum Boundary Circuit Breaker (Watchdog Switch) is an outdoor power distribution device with a rated voltage of 12 kV, three-phase AC at 50 Hz. This circuit breaker is primarily used for interrupting and closing load currents, overload currents, short circuits, quick breaks, grounding protection, optional reclosing cycles, local remote control, and remote communication in power systems. It is suitable for use in substation and industrial enterprise power distribution systems for protection and control purposes. When an internal fault occurs within a 12 kV T-type connected user, or even if the fault occurs inside the user’s incoming switch but the protection response time is not appropriate compared to the substation outgoing switch protection, the substation outgoing switch protection will be tripped. If the fault is permanent and the substation fails to recover, an incident within a medium-voltage user area can cause a power outage across the entire distribution line. Such common grid-related incidents can cause significant damage to society. The ZW3₂-1₂F Outdoor High-Voltage Vacuum Boundary Circuit Breaker (Watchdog Switch) (hereinafter referred to as the circuit breaker), installed at the responsibility boundary on overhead lines, i.e., at the front end of the user’s incoming line, will automatically eliminate single-phase grounding faults and interphase short circuit faults within the user area, preventing the spread of faults to the transmission line, ensuring the power safety of non-faulty users, and enhancing power reliability.
Usage environmental conditions:
1. Ambient air temperature: -4°C to +4°C;
2. Altitude: No more than 2000 m;
3. Wind speed does not exceed 3.4 m/s (equivalent to 700 Pa on the cylindrical surface);
4. Contamination Level: V;
5. There is no frequent severe vibration, and the earthquake intensity does not exceed 8 degrees;
6. Areas free from fires, explosions, and chemical corrosion.
Main functions of the controller:
1. Three-section flow protection
2. Reclosure Control
3. Post-acceleration function
4. Zero-Sequence Protection
5. Auxiliary functions (power-on switching, power-off disconnection)
6. Remote Communication
7. Nearby remote control
