Views:0 Author:Site Editor Publish Time: 2021-11-06 Origin:Site
Outdoor auto reclosers for mainline feeders are more readily available. Traditionally, it operates as standalone devices with no electrical or mechanical connection between phases and has lower interrupting ratings. Outdoor auto reclosers with three-phase tanks and higher interrupting ratings have been introduced, which have one phase reclosing capability.
What are the requirements of an outdoor auto recloser?
What are the limits for outdoor auto reclosers?
How to install outdoor auto recloser?
The action time of the outdoor auto recloser should be as short as possible, which is generally 0.5 to 1 second.
In the following cases, the outdoor auto recloser does not work:
l It should not be overlapped during manual trip.
l When the circuit breaker is manually closed on the fault line, the circuit breaker should not be reclosed after the relay protection action causes the circuit breaker to trip.
The number of actions of outdoor auto recloser should meet the predetermined number of times, which does not allow multiple overlaps.
The outdoor auto recloser should be able to automatically reset after the action and be ready for action next time. For lines with voltage levels of 10kV and below, manual resetting can also be used when unattended.
General outdoor auto recloser can start the reclosing device with the principle that the position of the control switch does not correspond to the position of the circuit breaker. For comprehensive outdoor auto recloser, the principle of non-correspondence and protection should be started at the same time.
In ultra-high voltage AC transmission and distribution lines, the distance between phase stations is large. Most of the faults are single-phase grounding short circuits, so the reclosing method generally adopts outdoor auto recloser.
When the outdoor auto recloser is successful, the fault has been cleared that there is no residual voltage on the original fault phase. Its overvoltage is the same as the closing voltage of the no-load circuit. At first, ground fault occurs. Then, the circuit breakers at both ends of the fault phase act to remove the fault phase. The circuit breakers on both sides again to remove the fault.
The calculation of outdoor auto recloser overvoltage also considers two situations, that are, the influence of different series compensation capacitor compensation on closing overvoltage and the influence of series compensation capacitor installed on the line at different positions on closing overvoltage.
If outdoor auto recloser cooperates with RCCB:
l First, put the linkage device into the RCCB’s handle.
l Then close the upper and lower buckles to ensure that they are tightly connected.
If outdoor auto recloser cooperates with MCB：
l First, put the linkage device into the handle of the MCB.
l Then align the small cylinder to the corresponding hole.
l Finally, close the upper and lower buckles to ensure they are tightly connected.
If outdoor auto recloser cooperates with MCB/RCCB and accessories：
l First, install the MCB/RCCB on the rail.
l Then, install the device.
l Finally, install the accessories next to the device.
Learn more about outdoor auto reclosers can know the requirements of outdoor auto reclosers and the limits for outdoor auto reclosers. As one of the powerful companies in China, Wenzhou Rockwill Electric Co., Ltd. is a good partner for you to cooperate with. It is our honor to have your message.