1.3 Environment Monitoring Principle (Power System
+Sensor Transfer Box)
The sensor transfer box collects the environment information from relevant sensors and forwards
the information to the monitoring module of the power system. The monitoring module of the
power system then processes the environment information and reports the information to the
control system. With the sensor transfer box, the monitoring function is extended.
Environment monitoring is implemented as follows: The EMU and the control system are
connected using a serial port cable and they communicate with each other through the master-
slave communication protocol or P2P communication protocol. In this way, users can monitor
the environment status of the device on the EMS center.
Figure 1-2 shows the environment monitoring principle.
Figure 1-2 Environment monitoring principle
Cable
Cable
Fiber
Monitoring unit
Control board
EMS center
Sensor transfer box
External
sensor
External dry contact
signal
Cable Cable
NOTE
l The sensor transfer box collects the monitored analog and digital parameters and external dry contact
signals from external sensors.
l The EMU reports the monitored parameters collected by the sensor transfer box to the control system.
l The network management center (EMS center) can monitor alarms remotely.
l Dry contact signals refer to passive digital signals.
UA5000 Universal Access Unit
Environment Monitoring 1 Environment Monitoring Principles
Issue 01 (2012-08-17) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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