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6-
10
LPS-D Line Protection System
GE Power Management
6.4 BACKUP PROTECTION TESTS
6 FUNCTIONAL TESTS (USER SETTINGS)
6
6.4.3 T11 – GROUND TIME OVERCURRENT 51G
1.
Protection Settings:
OVERCURRNT
(610)
51G = YES
(611)
51G_DIRCNL = NO
(612)
51GPICKUP = [_________] amps,
(615)
51GTIMDIAL = [________] Time dial,
(614)
51GCURVE = [________] Curve,
51G is calculated with the equation
51G =
(eq. 6–16)
where
I
0
is equal to the zero-sequence current. Since
I
op
is single-phase,
I
0
is given by
I
op
/ 3 =
I
0
.
(eq. 6–17)
Substituting Equation 6–17 into Equation 6–16 yields
I
op
= 51G
.
(eq. 6–18)
Therefore, 51G will pick up when
I
op
= 51G. The time it takes for 51G to pick up is determined by the time-
dial curve in Chapter 2: CALCULATION OF SETTINGS.
If the test current exceeds 2 x
I
n
(
I
n
is the rated current), then the current test should be
applied with a 50% duty cycle. For instance, if current is applied for 5 minutes, it should be
left off for 5 minutes before it is reapplied.
2.
Connect the relay as shown in Figure 5–2: GROUND REACH TIMER TEST CONNECTIONS on page 5–8.
Start the timer when
I
op
is applied and stop the timer when the A1 closes (the relay trips).
3.
For this test remove the relay from test mode and assign TOCTRP to A1.
(2007) A1 = index 119, TOCTRP
4.
Apply
I
op
at 2·51G = [________] amps rms and start the timer. Leave the current on until the A1 contact
closes, then stop the timer. The time should be within ±7% of the value found on the LPS-D time-dial curve
in use.
5.
Reduce
I
op
to zero.
6.
Repeat steps 4 and 5 for
I
op
at 6·51G = [________] and 10·51G = [________].
7.
Change the setting of 51G_DRCNL (0611) back to YES if directional control of 51G is required.
3
I
0
×
CAUTION
NOTE
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 ...
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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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