80
6
F
2
S
0
8
3
4
Definite time reset
The definite time resetting characteristic is applied to the UVS1 and UVG1 elements when the
inverse time delay is used.
If definite time resetting is selected, and the delay period is set to instantaneous, then no
intentional delay is added. As soon as the energising voltage rises above the reset threshold, the
element returns to its reset condition.
If the delay period is set to some value in seconds, then an intentional delay is added to the reset
period. If the energising voltage is below the undercurrent setting for a transient period without
causing tripping, then resetting is delayed for a user-definable period. When the energising
voltage rises above the reset threshold, the integral state (the point towards operation that it has
travelled) of the timing function (IDMT) is held for that period.
This does not apply following a trip operation, in which case resetting is always instantaneous.
Undervoltage Inverse
Time Curves
1.000
10.000
100.000
1000.000
0
0.2
0.4
0.6
0.8
1
Applied Voltage (x Vs)
O
p
e
rati
n
g
T
im
e (se
cs)
TMS = 10
TMS = 5
TMS = 2
TMS = 1
Figure 2.4.9.6 IDMT Characteristic
Scheme Logic
Figures 2.4.9.7 and 2.4.9.9 show the scheme logic of the UVS1 and UVG1 undervoltage
protection with selective definite time or inverse time characteristic. The definite time protection
is selected by setting [UV
∗
1EN] to “DT”, and trip signal UV
∗
1_TRIP is given through the
delayed pick-up timer TU
∗
1. The inverse time protection is selected by setting [UV
∗
1EN] to
“IDMT”, and trip signal UV
∗
1_TRIP is given.
The UVS1 and UVG1 protections can be disabled by the scheme switch [UV
∗
1EN] or the PLC
signal UV
∗
1_BLOCK.
These protections are available to trip instantaneously by the PLC signal UV
∗
1_INST_TP except
for [UV
∗
1EN]=“OFF” setting.
Figures 2.4.9.8 and 2.4.9.10 show the scheme logic of the UVS2 and UVG2 protection with
definite time characteristic. The UV
∗
2 gives the PLC signal UV
∗
2_ALARM through delayed
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Содержание GRZ100-211B
Страница 284: ... 283 6 F 2 S 0 8 3 4 Appendix A Block Diagram w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 288: ... 287 6 F 2 S 0 8 3 4 Appendix B Signal List w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 324: ... 323 6 F 2 S 0 8 3 4 Appendix C Variable Timer List w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 352: ... 351 6 F 2 S 0 8 3 4 Appendix G External Connections w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 390: ... 389 6 F 2 S 0 8 3 4 Appendix J Return Repair Form w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 396: ... 395 6 F 2 S 0 8 3 4 Appendix K Technical Data w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 408: ... 407 6 F 2 S 0 8 3 4 Appendix L Symbols Used in Scheme Logic w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 412: ... 411 6 F 2 S 0 8 3 4 Appendix M Example of Setting Calculation w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 440: ... 439 6 F 2 S 0 8 3 4 Appendix P Data Transmission Format w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 448: ... 447 6 F 2 S 0 8 3 4 Appendix R Inverse Time Characteristics w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 460: ... 459 6 F 2 S 0 8 3 4 Appendix T Ordering w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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