Product description

When the 12kV overhead distribution line T is connected to the branch line or the internal user fails, the timing of the line switch protection action and the substation outlet switch protection time limit cannot be properly adjusted, which will cause the substation outlet switch to trip. If the nature of the fault is permanent and the substation coincidence will not be successful, then a local failure in a medium voltage user community will power down the entire 12kV distribution line. If an outdoor junction breaker is installed at the T junction or the customer end (responsibility demarcation point), it is ensured that the failure (overcurrent, short circuit, single phase grounding, etc.) in the user boundary is determined and the fault is automatically isolated. Users in non-faulty areas use power normally.

Model meaning

Environmental conditions

◆ Ambient temperature: no higher than +40T, not lower than -40C;
◆ Relative humidity of air: the average value of 曰 is not more than 95%, and the monthly average is not more than 90%;
◆ The altitude does not exceed 2000 meters;
◆ The wind pressure does not exceed 700Pa (equivalent to a wind speed of 34m/s);
◆ The intensity of the earthquake does not exceed 8;
◆ No fire, explosion, serious pollution, chemical corrosion and severe vibration.

Main technical parameters of circuit breaker

ZW32-12F outdoor high-voltage intelligent demarcation vacuum circuit breaker (watchdog) can be used on 12kV feeder overhead line to avoid the connection of fault-free lines, thus power failure, narrowing the scope of power failure, shortening the power outage time of users, and protecting the main network. safe operation. It also has fault detection function, protection control function and communication function, which can realize automatic cut-off single-phase ground fault and automatic isolation phase-to-phase short fault. The installation point uses the responsibility demarcation point for the user incoming line of the 12kV distribution line, and can also be applied to the branch line connection that meets the requirements.