As mentioned above, the thermal characteristic is effective only if the pickup threshold U/f> is exceeded.
shows the behaviour of the protection on the assumption that the setting for the pickup
threshold was chosen higher or lower than the first setting value of the thermal characteristic.
Cool-down Time
Tripping by the thermal image is reset at the time of the pickup threshold reset. However, the counter content
is counted down to zero with the cooldown time parametrized at address 4314
T COOL DOWN
. In this
context, this parameter is defined as the time required by the thermal replica to cool down from 100 % to 0 %.
i
i
NOTE
All U/f values in the following settings overview are referred to the induction of the protected object under
nominal conditions, i.e. U
NObj
/f
N
.
Settings
Addr.
Parameter
Setting Options
Default Setting
Comments
4301
OVEREXC. PROT.
OFF
ON
Block relay
OFF
Overexcitation Protection (U/f)
4302
U/f >
1.00 .. 1.20
1.10
U/f > Pickup
4303
T U/f >
0.00 .. 60.00 sec; ∞
10.00 sec
T U/f > Time Delay
4304
U/f >>
1.00 .. 1.40
1.40
U/f >> Pickup
4305
T U/f >>
0.00 .. 60.00 sec; ∞
1.00 sec
T U/f >> Time Delay
4306
t(U/f=1.05)
0 .. 20000 sec
20000 sec
U/f = 1.05 Time Delay
4307
t(U/f=1.10)
0 .. 20000 sec
6000 sec
U/f = 1.10 Time Delay
4308
t(U/f=1.15)
0 .. 20000 sec
240 sec
U/f = 1.15 Time Delay
4309
t(U/f=1.20)
0 .. 20000 sec
60 sec
U/f = 1.20 Time Delay
4310
t(U/f=1.25)
0 .. 20000 sec
30 sec
U/f = 1.25 Time Delay
4311
t(U/f=1.30)
0 .. 20000 sec
19 sec
U/f = 1.30 Time Delay
4312
t(U/f=1.35)
0 .. 20000 sec
13 sec
U/f = 1.35 Time Delay
4313
t(U/f=1.40)
0 .. 20000 sec
10 sec
U/f = 1.40 Time Delay
4314
T COOL DOWN
0 .. 20000 sec
3600 sec
Time for cool down
Information List
No.
Information
Type of
Informa-
tion
Comments
5353
>U/f BLOCK
SP
>BLOCK overexcitation protection
5357
>RM th.rep. U/f
SP
>Reset memory of thermal replica U/f
5361
U/f> OFF
OUT
Overexcitation protection is swiched OFF
5362
U/f> BLOCKED
OUT
Overexcitation protection is BLOCKED
5363
U/f> ACTIVE
OUT
Overexcitation protection is ACTIVE
5367
U/f> warn
OUT
Overexc. prot.: U/f warning stage
5369
RM th.rep. U/f
OUT
Reset memory of thermal replica U/f
5370
U/f> picked up
OUT
Overexc. prot.: U/f> picked up
5371
U/f>> TRIP
OUT
Overexc. prot.: TRIP of U/f>> stage
5372
U/f> th.TRIP
OUT
Overexc. prot.: TRIP of th. stage
2.11.3
2.11.4
Functions
2.11 Overexcitation Protection
222
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Summary of Contents for SIPROTEC 4 7UT6 Series
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