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GE Power Management
LPS-D Line Protection System
2-
25
2 CALCULATION OF SETTINGS
2.3 PROTECTION SETTINGS
2
IPB is logically ANDed with the reverse looking negative sequence directional function, NB, to form the
pilot blocking function. The IPB operating quantity is:
IPT
op
= 3·
I
0
- IPBKFACTOR x 3·
I
1
The IPBKFACTOR controls the amount of positive-sequence current restraint that is used with the
IPB
function. IPBKFACTOR can be set equal to 0 or 0.066. A setting of 0.066 is proposed for these schemes.
Positive sequence current restraint is used in both the tripping and blocking functions to provide increased
security for any current unbalance that may occur during load flow or external fault conditions.
IPT and IPB must be set so as to provide proper coordination. This is done by setting the IPB function
more sensitively than the IPT function. The following settings are proposed:
IPB_PICKUP = minimum
IPT_PICKUP = 1.3 x IPB_PICKUP
R
+
I
oc
where: IPB_PICKUP
R
= setting of IPB function at remote terminal of transmission line.
I
oc
= zero sequence line charging current (include effect of any non-switched shunt reactors)
•
Blocking Scheme
IPT is logically ANDed with the forward looking negative sequence directional function, NT, to form the pilot
tripping function. The IPT operating quantity is:
IPT
op
= 3·
I
0
- (0.3)·
I
1
Positive sequence current restraint is used to provide increased security for any current unbalance that
may occur during load flow or external fault conditions.
Depending on the CARRSTART setting (1204) described under the SCHEME category, IPB may be:
1.
Logically ANDed with the negative sequence blocking function NB to form the pilot tripping function.
2.
Used alone to form the carrier start function.
3.
Not be used at all in the carrier start circuit.
When IPB is used, either alone or with NB, the operating quantity is:
IPT
op
= 3·
I
0
- IPBKFACTOR x 3·
I
1
The IPBKFACTOR controls the amount of positive sequence current restraint that is used with the
IPB
function. IPBKFACTOR can be set equal to 0 or 0.066. The proposed settings for a blocking scheme are
dependent on the CARRSTART setting and are given in Table 2–5: PROPOSED SETTINGS FOR
BLOCKING SCHEME below.
505: IPBKFACTOR - IPB I1 Restraint
The IPB operating quantity is:
IPB
op
= 3
·I
0
– IPBKFACTOR x 3·
I
1
Table 2–5: PROPOSED SETTINGS FOR BLOCKING SCHEME
CARRSTART
IPBKFACTOR
DIR (NB and IPB)
0.066
IPB (IPB alone)
0.0
FD (Fault Detector)
Don’t Care
Содержание LPS-D
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Страница 164: ...3 14 LPS D Line Protection System GE Power Management 3 3 PRINTED CIRCUIT BOARD MODULES 3 HARDWARE DESCRIPTION 3 ...
Страница 226: ...7 4 LPS D Line Protection System GE Power Management 7 1 RATINGS 7 SPECIFICATIONS 7 ...
Страница 284: ...10 20 LPS D Line Protection System GE Power Management 10 8 HELP MENU 10 ALPS TEST PROGRAM 10 ...
Страница 334: ...A 4 LPS D Line Protection System GE Power Management A 1 FREQUENTLY ASKED QUESTIONS APPENDIXA A ...
Страница 412: ...C 34 LPS D Line Protection System GE Power Management C 3 POINT LISTS APPENDIXC C ...
Страница 416: ...D 4 LPS D Line Protection System GE Power Management D 1 KEYPAD MENUS APPENDIXD D ...
Страница 422: ...F 2 LPS D Line Protection System GE Power Management F 1 WARRANTY INFORMATION APPENDIXF F ...
Страница 435: ...GE Power Management LPS D Line Protection System xiii INDEX INDEX tests 6 11 ZONE TIMER functional tests 5 10 ...
Страница 436: ...xiv LPS D Line Protection System GE Power Management INDEX INDEX ...