![ABB REG316 4 Series Operating Instructions Manual Download Page 161](http://html.mh-extra.com/html/abb/reg316-4-series/reg316-4-series_operating-instructions-manual_4778161.webp)
REG 316*4 1MRB520049-Uen / Rev. F
ABB Switzerland Ltd
3-123
, the relay setting for a zone of
protection of 95 % is 5 % of U
max
. The scheme detects E/F’s on
the generator stator winding, the cables to the step-up trans-
former and the delta-connected windings of the step-up trans-
former.
The capacitances between primary and secondary of the step-up
transformer conduct currents emanating from E/F’s on the HV
side to the LV side and can cause false tripping of the stator E/F
protection. The capacitive coupling of E/F currents on the HV
side takes place regardless of whether the HV star-point is
grounded or not. The capacitance C
12
between HV and LV
windings of the step-up transformer and the capacitance C of the
generator circuit form a potential divider that determines the
potential of the generator star-point (see Fig. 3.5.11.3a). The
value of the capacitance C is usually too low to reliably hold the
star-point below the pick-up setting of the protection. For this
reason, the generator star-point is grounded via a resistor R
E
which ensures that the potential of the star-
point remains below the setting of the protection for an E/F on
the HV power system. Correspondingly, the value of the resistor
R
E
is chosen such that for a given C
12
and an E/F at the HV
terminals of the step-up transformer, the offset of the generator
star-point does not reach the pick-up setting of the 95 % E/F
protection.
HEST 905 030 FL
3 C
12
U
I
E
Star-point
3 C
3
HV
U
U
I
E
R
E
3 C
12
3
HV
U
a) without grounding resistor
b) simplified circuit with
grounding resistor
Fig. 3.5.11.3
Generator star-point off-set for an E/F on the HV
side of the step-up transformer
Summary of Contents for REG316 4 Series
Page 4: ......
Page 6: ......
Page 90: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 52 ...
Page 96: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 58 ...
Page 108: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 70 ...
Page 116: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 78 ...
Page 142: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 104 ...
Page 148: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 110 ...
Page 154: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 116 ...
Page 176: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 138 ...
Page 182: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 144 ...
Page 190: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 152 ...
Page 216: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 178 ...
Page 234: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 196 ...
Page 256: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 218 ...
Page 330: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 292 ...
Page 338: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 300 ...
Page 342: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 304 ...
Page 348: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 310 ...
Page 352: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 314 ...
Page 356: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 318 ...
Page 360: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 322 ...
Page 366: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 328 ...
Page 370: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 332 ...
Page 374: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 336 ...
Page 388: ...ABB Switzerland Ltd REG 316 4 1MRB520049 Uen Rev F 3 350 ...
Page 427: ...REG 316 4 1MRB520049 Uen Rev B ABB Switzerland Ltd 4 29 Fig 4 13 Locus of the load angle d 90 ...
Page 444: ......
Page 626: ......
Page 628: ......
Page 684: ......
Page 688: ......
Page 802: ......
Page 810: ......
Page 824: ......
Page 825: ......
Page 826: ......
Page 827: ......
Page 828: ......
Page 829: ......
Page 830: ......
Page 831: ......
Page 832: ......
Page 833: ......
Page 834: ......
Page 835: ......
Page 836: ......
Page 837: ......
Page 838: ......
Page 839: ......
Page 840: ......
Page 841: ......
Page 842: ......
Page 843: ......
Page 844: ......
Page 845: ......
Page 846: ......
Page 847: ......
Page 848: ......
Page 849: ......
Page 850: ......
Page 851: ......
Page 852: ......
Page 853: ......
Page 854: ......
Page 855: ......
Page 856: ......
Page 857: ......
Page 858: ......
Page 859: ......
Page 860: ......
Page 861: ......
Page 862: ......
Page 863: ......
Page 864: ......
Page 865: ......
Page 866: ......
Page 867: ......
Page 868: ......
Page 869: ......
Page 870: ......
Page 871: ......
Page 872: ......
Page 873: ......
Page 874: ......
Page 875: ......
Page 876: ......
Page 877: ......
Page 878: ......
Page 879: ......
Page 880: ......
Page 881: ......
Page 882: ......
Page 883: ......
Page 884: ......
Page 885: ......
Page 886: ......
Page 887: ......
Page 888: ......
Page 889: ......
Page 890: ......
Page 891: ......
Page 892: ......
Page 893: ......
Page 894: ......
Page 895: ......
Page 896: ......
Page 897: ......
Page 898: ......
Page 899: ......
Page 900: ......
Page 901: ......
Page 902: ......
Page 903: ......
Page 904: ......
Page 905: ......
Page 906: ......
Page 907: ......
Page 908: ......
Page 909: ......
Page 910: ......
Page 911: ......
Page 912: ......
Page 913: ......
Page 914: ......
Page 915: ......
Page 916: ......
Page 917: ......
Page 918: ......
Page 919: ......
Page 920: ......
Page 921: ......
Page 922: ......
Page 923: ......
Page 924: ......
Page 925: ......
Page 926: ......
Page 927: ......
Page 928: ......
Page 929: ......
Page 930: ......
Page 931: ......
Page 932: ......
Page 933: ......
Page 934: ......
Page 935: ......
Page 936: ......
Page 937: ......
Page 938: ......
Page 939: ......
Page 940: ......
Page 941: ......
Page 942: ......
Page 943: ......
Page 944: ......
Page 945: ......
Page 946: ......
Page 947: ......
Page 948: ......
Page 949: ......
Page 950: ......
Page 951: ......
Page 952: ......
Page 953: ......
Page 954: ......
Page 955: ......
Page 956: ......
Page 957: ......
Page 958: ......
Page 959: ......
Page 960: ......
Page 961: ......
Page 962: ......
Page 963: ......
Page 964: ......
Page 965: ......
Page 966: ......
Page 967: ......
Page 968: ......
Page 969: ......
Page 970: ......
Page 971: ......
Page 972: ......
Page 974: ......
Page 976: ......