An enclosed pole mounted load break switch is a type of medium voltage AC automatic switching device. Its main switching element is a sf6 gas insulation load break switch, typically installed at the demarcation point on the user side of the power system. It is used to isolate faults on user side and safeguard the upstream grid.
The enclosed pole mounted load break switch is designed as an outdoor pole mounted electrical device. It is made up of the load switch body and a controller, interconnected via sealed control cables with aviation connectors. Its arc extinguishing system combines a vacuum interrupter with SF6 insulation, meanwhile, the interrupter operates in series with a mechanically linked isolating switch to achieve a double break configuration.
The core functions of the device include automatic clearance of single phase earth faults on the user side and automatic isolation of phase short circuit faults. Upon fault detection, it trips directly or locks the opening action to prevent fault propagation to the upstream network. The enclosed pole mounted load break switch is applicable to 12 kV, 50 Hz distribution networks at user entry points, for both indoor and outdoor installations. Structurally, it differs from a user boundary circuit breaker.
|
Max. Working Voltage |
kV |
11.5 |
|
Rated Frequency |
Hz |
50 or 60 |
|
Rated Current |
A |
400 |
|
Peak Withstand Current |
kA |
16 |
|
4s withstand current effective value |
A |
6.3 |
|
Rated Breaking Current |
kA |
6.3 |
|
Rated Short Circuit Making Current |
kA |
16 |
|
Mechanical Life |
times |
3000 |
Q: What are the main advantages of the enclosed design?
A: The enclosure provides reliable insulation and protection against dust, humidity, and corrosive environments. It reduces maintenance requirements, extends service life, and improves operational safety compared to open type switches.
Q: What kind of insulation and arc extinguishing methods are used on an enclosed pole mounted load break switch?
A: The enclosed pole mounted load break switch use SF₆ gas or vacuum environment as insulation medium and arc extinguishing methods. Of course, the arc is typically interrupted either by a vacuum interrupter or by puffer type SF₆ chambers, to ensure fast interruption and minimal contact wear.
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