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Operation
indicators and
push-buttons
8
f n =
50Hz
U
n
U
60Hz
n
SPAU 331 C
1
2
3
4
SGR
5
6
7
8
0
1
U1
U2
SPCU 1C6
SPCU 3C15
0 0 0 0
0
0 0 0
[ ]
<
1
U
/
U
%
1
U
/
U
o
n
(
)
2
>
2
n
U o
U
max
(
)
3
> >
3
<<
n
U o
3
U
[
]
4
t
t
>
%
4
/
U
min
[
]
t
t
> >
(
<
5
/
%
5
n
U
(
6
n
3
U
[
7
t
t
<
/
8
t
t
<<
/
RS 613
Fig. 4. System front panel of the voltage relay
SPAU 331 C.
1. The green LED U
aux
lit when the power supply of the relay is op-
erating.
2. The relay modules are provided with two
operating stages and each stage has its own
yellow/red LED operation indicator. The op-
eration indicator goes on with a yellow light
when the operation stage starts and with a
red light if the stage delivers a tripping signal
as well. The LED indicators can be given self-
reset or manual reset mode of operation. Nor-
mally, when the stage resets, the red opera-
tion indicator remains lit after being switched
on to indicate by whitch stage the tripping
was initiated.
2
=
/
100V 110V
( U )
5
= 100V 110V
/
( U )
0
U
aux
80...265 V
~ –
18...80 V
–
U3
0
0 0 0
n
/
U
n
/
U
n
/
U
n
)
)
<<
]
%
[
]
%
Ser.No.
on the system panel is
3. The front panels of both relay modules are
provided with a numerical display for indi-
cation of measured and set values, two push-
buttons marked STEP and RESET, a pro-
gramming switchgroup SG1 for selection of
relay functions and four setting knobs for op-
eration values. The STEP push-button can
be used for scanning through the measured
and set values of the module and for presen-
tation of the values concerned on the display
of the module. The RESET push-button is
used for resetting locally the red operation
indicators for tripping. An unreset operation
indicator does not affect the operation of the
relay module and thus, the module is
constantely operative.
4. The front panels of the relay modules are pro-
vided with a red LED used as a self-supervi-
sion alarm indicator IRF which indicates that
the self-supervision system has detected a per-
manent fault in the protection relay. Further,
the relay modules are provided with separate
LED indicators on the front panel for indi-
cation of the measured residual and phase-
to-phase voltages.
5. The cover of the protection relay case is made
of transparent, UV-stabilized polycarbonate
polymer and provided with three push-but-
tons for scanning of the relay parameters by
means of the separate displays of the mod-
ules and the STEP push-buttons inside the
cover. To enable resetting of the modules by
means of the RESET push-buttons, the cover
of the relay case must be opened using the
locking screws for the case.
Detailed operation instructions are given in the
manuals describing the individual relay mod-
ules and in the document "General characteris-
tics of C-type relay modules".
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