Siemens SIPROTEC 4 7UT6 Series User Manual

As mentioned above, the thermal characteristic is effective only if the pickup threshold U/f> is exceeded.
Figure 2-103shows 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

Siemens SIPROTEC 4 7UT6 Series Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7UT6 Series
Category	Protection Device
Language	English