2.11 Overexcitation Protection
243
7UT613/63x Manual
C53000-G1176-C160-2
As mentioned above, the thermal characteristic is effective only if the pickup threshold
U/f> is exceeded. Figure 2-101 illustrates the behaviour of the protection on the as-
sumption 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. How-
ever, the counter content is counted down to zero with the cooldown time parame-
trized 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 %.
Note
All U/f values in the following settings overview are referred to the induction of the pro-
tected object under nominal conditions, i.e. U
NObj
/f
N
.
2.11.3 Settings
Address 4310 t(U/f=1.25)
Address 4311 t(U/f=1.30)
Address 4312 t(U/f=1.35)
Address 4313 t(U/f=1.40)
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
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