Internal Of The Spd27Sz Surge Protector; Working And Alarm Principles Of The Spd27Sz Surge Protector - Huawei UA5000 Manual

UA5000 Universal Access Unit
Environment Monitoring
Figure 10-8 Internal of the SPD27SZ surge protector
Principles
Figure 10-9
Figure 10-9 Working and alarm principles of the SPD27SZ surge protector
Diesel
Mains
Issue 01 (2012-08-17)
describes the working and alarm principles of the SPD27SZ surge protector.
Lin
input
Nin
First-level
Lin
protection
input
Nin
circuit
Breaker
Cables
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Failure alarm
circuit
Second-level
Decouplin
protection
g circuit
circuit
SPD
Power cable
Signal cable
PE cable
Control cable
10 Sensors
failure
SPD
monitoring port
Lout
Nout
PE
178