2.3 Directional Overcurrent Protection 67, 67N
88
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Figure 2-17
Overcurrent protection for parallel transformers
For line sections supplied from two sources or in ring-operated lines the time overcur-
rent protection has to be supplemented by the directional criterion. Figure 2-18 shows
a ring system where both energy sources are merged to one single source.
Figure 2-18
Transmission lines with sources at each end
Depending on the setting of parameter
613
Gnd O/Cprot. w.
, the ground current
element can operate either with measured values
I
N
or with the values 3
I
0 calculated
from the three phase currents. Devices featuring a sensitive ground current input,
however, use the calculated quantity 3
I
0.
For each element the time can be blocked via binary input or automatic reclosure
(cycle-dependent), thus suppressing the trip command. Removal of blocking during
pickup will restart time delays. The Manual Close signal is an exception. If a circuit
breaker is manually closed onto a fault, it can be re-opened immediately. For overcur-
Содержание siprotec SJ62
Страница 3: ...3 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 9: ...Preface 9 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 21: ...Contents 19 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 35: ...1 Introduction 33 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 365: ...2 Functions 363 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 443: ...3 Mounting and Commissioning 441 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 529: ...4 Technical Data 527 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 699: ...A Appendix 697 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 701: ...Literature 699 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 714: ...Index 712 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 715: ...Index 713 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...