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GE Power Management
LPS-D Line Protection System
6-
7
6 FUNCTIONAL TESTS (USER SETTINGS)
6.3 MEASURING UNIT TESTS
6
6.3.4 T7 – GROUND DIRECTIONAL TRIP TEST, IPT + NT
This test applies to blocking schemes only.
1.
Protection Settings:
Z2DISTANCE
(205)
Z2GRDCHAR = GDOC
CURSUPVISN
(503)
IPT_PICKUP = [_________] amps,
SCHEME
(1201) PICKSCHEME = BLOCK
The IPT operating quantity is given by
(eq. 6–3)
where
I
0
is equal to the Zero-Sequence Current;
I
1
is equal to the Positive-Sequence Current; and
KT
is
equal to 0.1 for Blocking and Hybrid schemes or 0 for POTT and PUTT schemes.
Since the test current,
I
op
, is single-phase,
I
0
and
I
1
are given by
I
0
=
I
op
/3
(eq. 6–4)
I
1
=
I
op
/3
(eq. 6–5)
Substituting equations 6–4 and 6–5 into equation 6–3 and assuming a Blocking or Hybrid scheme yields
PUIPT =
I
op
– 0.1
I
op
(eq.
6–6)
= 0.9
I
op
Therefore IPT will pick up when
I
op
= PUIPT / 0.9.
2.
Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–14.
3.
Set the voltage inputs to the following values:
VA: 55 V rms
∠
0°
VB: 67 V rms
∠
–120°
VC: 67 V rms
∠+
120°
4.
Set the relay into test mode 36 (Ground Directional Trip). The LUI should display
GRD DIR TRIP ON
5.
Set the current of
I
op
to (PUIPT / 0.9) + 0.10 = [_________] amps rms and apply to the relay. The A1 con-
tact should close. Lower
I
op
to (PUIPT / 0.9) – 0.1 = [_________] amps rms; the A1 contact should open.
6.
Reduce
I
op
to zero.
NOTE
3
I
0
3
KTx I
1
×
–
×
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 ...
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