Supervision Functions
234 PRS-7367
4 Supervision Functions
4.1 Overview
Though the protection system is in non-operating state under normal conditions, it is waiting for a
power system fault to occur at any time and must operate for the fault without fail.
When the equipment is in energizing process, the equipment needs to be checked to ensure there
are no errors. Therefore, the automatic supervision function, which checks the health of the
protection system during startup and normal operation procedure, plays an important role.
The numerical relay based on the microprocessor operations has the capability for implementing
this automatic supervision function of the protection system.
In case a fatal fault is detected during automatic supervision, the equipment will be blocked out. It
means that this relay is out of service. Therefore, you must re-energize the relay or even replace a
module to make this relay back into service.
4.2 Supervision Alarm and Block
The relay device has powerful real-time self-check capability. The device will automatically check
its own software and hardware running state during the process of operation. If there is any
abnormal situation, the abnormal information will be displayed on the LCD, and the corresponding
indicator and signal relay will issue prompt. Besides, these abnormal self-check and alarm signal
can be uploaded to the SCADA through the IEC 61850 or IEC 60870-103 communication protocol.
Self-check scope of the device is as follows:
1. Self-check about the hardware:
Alarm signal of analog quantity circuit self-check
Alarm signal of BI circuit self-check
Alarm signal of BO circuit self-check
Alarm signal of storage self-check
Alarm signal of watchdog self-check
2. Self-check about the software and configuration
Alarm signal of software running state self-check
Alarm signal of configuration self-check
Alarm signal of internal communication self-check
3. Self-check about the external communication
Alarm signal of external communication self-check
If the relay device is in abnormal status, alarm signal will be issued. Some alarm signals will block
the protection function, while some will not. The detailed information is shown as the following
table.
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