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1MRS 755310
4.1.18.
Feeder Protection Relay
Technical Reference Manual
Self-supervision (IRF) system
REF 610 is provided with an extensive self-supervision system which continuously
supervises the software and the electronics of the relay. It handles
run-time fault situations and informs the user about an existing fault via a LED on
the HMI and a text message on the LCD. There are two types of fault indications:
IRF indications and warnings.
Internal relay fault
When an internal relay fault is detected, which will prevent relay operation, the relay
will first try to eliminate it by restarting. Only after the fault has been found to be
permanent, the green indicator LED (ready) will start to blink and the
self-supervision output contact will be activated. All other output contacts will be
returned to the initial state and locked for the internal relay fault. Further, a fault
indication message will appear on the LCD, including a fault code.
IRF indications have the highest priority on the HMI. None of the other HMI
indications can override the IRF indication. As long as the green indicator LED
(ready) is blinking, the fault indication cannot be cleared. In case an internal fault
disappears, the green indicator LED (ready) will stop blinking and the relay will be
returned to the normal service state, but the fault indication message will remain on
the LCD until manually cleared.
The IRF code indicates the type of internal relay fault. When a fault appears, the
code is to be recorded and stated when ordering service. The fault codes are listed in
the following table:
Table 4.1.18-1 IRF codes
Fault code
4
5
6
7
8
9
10, 11, 12
13
14
15
16
17, 18, 19
20, 21
30
50, 59
51, 52, 53, 54, 56
55
80
81
Type of fault
Error in output relay PO1
Error in output relay PO2
Error in output relay PO3
Error in output relay SO1
Error in output relay SO2
Error in the enable signal for output relay PO1, PO2, SO1
or SO2
Error in the feedback, enable signal or output relay PO1,
PO2, SO1 or SO2
Error in optional output relay SO3
Error in optional output relay SO4
Error in optional output relay SO5
Error in the enable signal for optional output relay SO3,
SO4 or SO5
Error in the feedback, enable signal or optional output
relay SO3, SO4 or SO5
Auxiliary voltage dip
Faulty program memory
Faulty work memory
Faulty parameter memory
Faulty parameter memory, calibration parameters
Optional I/O module missing
Optional I/O module unknown
REF 610
1) 2)
121
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