Section 5 Protection relay operation
5.1 Normal operation
In a normal protection relay use situation, the basic operation includes monitoring and
checking procedures.
• Monitoring measured values
• Checking object states
• Checking function setting parameters
• Checking events and alarms
All basic operations can be performed via the LHMI, WHMI or with PCM600.
For more information, see the PCM600 documentation.
5.2 Disturbance identification
Disturbances and their causes can be identified by indicator LEDs: Ready, Start and
Trip. During normal operation, the Ready LED is steady green.
Table 18: Disturbance indications
LED
State Description
Start LED Yellow, steady Protection started
Start LED Yellow, flashing Protection function blocked
Trip LED Red, steady Protection operated
Ready LED Green, flashing Internal fault
Further actions to be taken to identify the disturbance:
• Checking programmable LEDs
• Reading event history
• Checking fault records
• Analyzing disturbance recordings
1MRS758754 B Section 5
Protection relay operation
REC615 and RER615 83
Operation Manual
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