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GE Power Management
LPS-D Line Protection System
2-
15
2 CALCULATION OF SETTINGS
2.3 PROTECTION SETTINGS
2
203: Z2PCHARANG - Zone 2 Phase Characteristic Angle
This setting determines the characteristic shape and, consequently, the area of resistance coverage provided
by the Zone 2 phase distance functions. Z2PCHARANG can be set to 90° to 120° in 5° steps. A 90° setting is
recommended. If the desired reach, Z2PHREACH, with a 90° characteristic causes the Zone 2 functions to
pick up on the maximum load flow, then a "lens-shaped" characteristic must be used to prevent operation on
load without having to reduce the reach. The settings of both Z2PHREACH and Z2PCHARANG may be eval-
uated by using the formula associated with the method of Figure 2–4: MAXIMUM ALLOWABLE REACH on
page 2–13.
204: Z2GROUND - Zone 2 Ground Distance Function
The choice of settings is YES or NO. Set Z2GROUND = YES if the Zone 2 ground distance functions are to be
used, otherwise set Z2GROUND = NO.
205: Z2GRDCHAR - Zone 2 Ground Function Characteristic
This setting permits choosing either Mho ground distance (MHO), ground directional-overcurrent (GDOC), or
both (MHOGHDOC), for the overreaching functions in a pilot scheme. The following ground directional over-
current functions are placed in service whenever Z2GRDCHAR is set to MHOGDOC or GDOC.
1.
NT: forward looking negative sequence directional function.
2.
IPT: zero sequence overcurrent tripping function (with or without positive sequence current restraint,
depending on scheme type.
3.
NB: reverse looking negative sequence directional function.
4.
IPB: zero sequence overcurrent blocking function (with or without positive sequence current restraint).
NT is used to supervise IPT and NB is used to supervise IPB. The directional overcurrent functions can be
used to provide more sensitive protection for high resistance ground faults. Because of their sensitivity, how-
ever, they will operate for more faults beyond the remote terminal of the line and thus system security will be
reduced to some extent.
•
Step Distance Scheme
For a Step Distance scheme, this setting has no affect on the scheme logic, and Z2GRDCHAR may be set
to any value.
•
PUTT Scheme
In this scheme,. operation of the scheme is dependent on the Zone 1 ground distance functions to key the
transmitter for ground faults, thus the increased sensitivity provided by the IPT function is of no significant
benefit. The following setting is proposed:
Z2GRDCHAR = MHO
•
Blocking, Hybrid, POTT1 and POTT2 Schemes
If high resistance ground faults are of concern, the following setting is proposed:
Z2GRDCHAR = MHOGDOC
206: Z2GRDREACH - Z2 Ground Distance Function Reach
See discussion for the Z2PHREACH phase distance function reach setting (Protection Setting 202); the same
philosophy applies.
207: Z2GCHARANG - Z2 Ground Distance Function Characteristic Angle
Z2GCHARANG is adjustable from 90
°
to 120
°
and determines the shape of the Zone 2 ground characteristics
– circle or lens. Set Z2GCHARANG equal to Z2PCHARANG as determined earlier.
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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 ...