ABB SPAA 341 C /E351, User Manual

Page: 26 / 146

8
Operation
indicators
Each protection stage has its own red start and
trip code shown as a number on the display. The
TRIP indicator at the bottom right corner is
shared by the different protection stages. Switch-
group SGF5 is used for defining the mode of
function of the TRIP indicator.
The code numbers indicating tripping and the
red TRIP indicator remain lit, when the protec-
tion relay has issued a trip signal. Thus it is easy
to identify the tripping stage. The indicators
remain lit even though the stage that caused the
indication resets, and they have to be separately
reset. On the other hand, the code numbers
indication starting automatically turned off when
the protection stage resets. If the stage that
started also operates the code number indicating
starting turns into a code number indicating
operation. When desired, the code numbers
indicating starting can be set to remain lit, by
giving switches SGF2/1...5 proper settings.
Operation indicators that remain lit are reset
either by pressing the RESET push-button on
the front panel or by command V101 over the
SPA bus. Unreset operation indicators do not
affect the operation of the relay module.
The table below shows the code numbers of the
display or the corresponding code numbers read-
able with parameter V9 indicating starting or
operation of the relay module.
Indication Parameter V9 Symbol Explanation
1 1 I> START Staring of overcurrent stage I>
2 2 I> TRIP Operation of overcurrent I>
3 3 I>> START Staring of overcurrent stage I>>
4 4 I>> TRIP Operation of overcurrent stage I>>
5 5 I>>> START Staring of overcurrent stage I>>>
6 6 I>>> TRIP Operation of overcurrent stage I>>>
7 7 I
0
> START Starting of earth-fault stage I
0
>
8 8 I
0
> TRIP Operation of earth-fault stage I
0
>
9 9 I
0
>> START Starting of earth-fault stage I
0
>>
0 0 I
0
>> TRIP Operation of earth-fault stage I
0
>>
11 11
∆
I> TRIP Operation of phase discontinuity protection
stage
∆
I>
A 12 CBFP Operation of circuit breaker failure protection
unit
When one of the protection stages of the mod-
ule operates, the yellow LEDs on the upper part
of the front panel show on which phase the
current exceeded the set start current of the
stage, named phase fault indication. If, for in-
stance, code number 2 and indicators I
L1
and
I
L2
are lit, operation was caused by overcurrent
on the phases L1 and L2. The phase fault
indication is reset with the RESET push-but-
ton.
The self-supervision alarm indicator IRF indi-
cates that the self-supervision system of the relay
module has detected a permanent fault. Once a
fault has been detected the red indicator is lit. At
the same time the relay module delivers a con-
trol signal to the self-supervision system output
relay of the protection relay. In addition, in
most fault cases, a fault code appears on the
display to indicate the type of fault. This fault
code, which consists of a red figure one (1) and
a green 1…3 digit code number cannot be
removed by resetting. The code number should
be recorded after a fault situation and stated
when service is ordered.