6-
8
LPS-D Line Protection System
GE Power Management
6.3 MEASURING UNIT TESTS
6 FUNCTIONAL TESTS (USER SETTINGS)
6
6.3.5 T8 – GROUND DIRECTIONAL BLOCK TEST, IPB + NB
This test applies to blocking schemes only.
1.
Protection Settings:
Z2DISTANCE
(205) Z2GRDCHAR = GDOC
CURSUPVISN
(504) IPB_PICKUP = [_________] amps,
SCHEME
(1201) PICKSCHEME = BLOCK
The IPT operating quantity is given by
(eq. 6–7)
where
I
0
is equal to the zero-sequence current;
I
1
is equal to the positive-sequence current; and
KB
is
equal to 0.066 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. 6–8)
and
I
1
=
I
op
/ 3
(eq. 6–9)
Substituting Equations 8 and 9 into Equation 7 and assuming a Blocking or Hybrid scheme yields
PUIPT =
I
op
– 0.066·
I
op
(eq. 6–10)
= 0.934
I
op
Therefore IPT will pick up when
I
op
= PUIPT / 0.934.
2.
Connect the relay as shown in Figure 4–1: DIGITAL OUTPUT TEST CONNECTIONS on page 4–11.
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 37 (Ground Directional Block). The LUI should display
GRD DIR BLK ON
5.
Set the current of
I
op
to (PUIPB / 0.934) + 0.1 = [_________] amps rms and apply to the relay. The A1 con-
tact should close. Lower
I
op
to (PUIPB / 0.934) – 0.1 = [_________] amps rms; the A1 contact should
open.
6.
Reduce
I
op
to zero.
NOTE
3
I
0
3
KB
I
1
×
×
–
×
Содержание LPS-D
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