GJL4-1 Hinge with Indoor High Voltage Switcgear Equipment KYN28-12
Item | Technical data |
Rated voltage (KV) | | | | | |
Rated frequency(Hz) | 50 |
Insulator(capacity) | insulating | Frequency withstand voltage 5 min (KV) | | 32 | 42 | 68 | 100 |
Frequency withstand voltage 1 min (V) | 2000 |
Lighting impulse withstand voltage (KV) | | | | | |
Local discharge (pc) | ≤10 |
Dispute bend (N) | ≥10000 |
| |
1. Zhongzhigui's underside door(cable door) interlock is realized
by ground switch operation mechanism. When the ground switch is
divided, the cam on the ground switch lever causes the pin shaft in
the underside door interlock mechanism to lock on the tongue plate
of the lower door, so that the lower door can not be opened. When
the ground switch is closed, the cam on the ground switch operation
rod will press down the pin shaft, so that the neck of the pin
shaft in the tongue plate position, the tongue plate can be removed
from the pin shaft, the door can open.
2. Under normal conditions, this interlock can realize the safety
protection requirements of the lower door: when the circuit breaker
is closed, the cable room is charged, the ground switch can not be
closed, and the lower door can not be opened, preventing personnel
from straying into the charged cable room; Only when the circuit
breaker is disconnected, the grounding switch is closed, and the
cable room is uncharged, can the lower door be opened to enter the
cable room. However, in the case of abnormal work(e.g. debugging,
maintenance), the ground switch can also be divided and closed when
the lower door is opened and forgotten to close. If the ground
switch is divided, the circuit breaker can be closed.
3. Once the circuit breaker is closed, the cable room is charged
and the lower door has been opened, making it easy for personnel to
enter the charged cable room for safety incidents. This is a
serious security hazard in the design of the cabinet. The original
design in the design of fault prevention interlocks, only to
consider the cable room charged before the door can not open, but
ignore the lower door opened the cable room can be charged, that
is, do not consider backwards, so that this security hidden danger.