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6 FUNCTIONAL TESTS (USER SETTINGS)
SCHEME
(1201)
PICKSCHEME = BLOCK
The IPT operating quantity is given by:
where I
is the Zero-Sequence Current; I
0
schemes or 0 for POTT and PUTT schemes. Since the test current, I
I
= I
/3
(eq. 6–4)
op
0
I
= I
/3
(eq. 6–5)
1
op
Substituting Equations 6–4 and 6–5 into Equation 6–3 and assuming a Blocking or Hybrid scheme yields
PUIPT = I
– 0.1 I
op
= 0.9 I
op
Therefore IPT will pick up when I
2.
Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–12.
Set the voltage inputs to the following values: VA: 55 V rms ∠0°, VB: 67 V rms ∠–120°, VC: 67 V rms ∠+120°
3.
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
to (PUIPT / 0.9) + 0.10 = [_________] amps rms and apply to the relay. The A1 contact should
op
close. Lower I
to (PUIPT / 0.9) – 0.1 = [_________] amps rms; the A1 contact should open.
op
6.
Reduce I
to zero.
op
This test applies to blocking schemes only.
NOTE
1.
Protection Settings:
Z2DISTANCE
(205)
Z2GRDCHAR = GDOC
CURSUPVISN
(503)
IPT_PICKUP = [_________] amps
SCHEME
(1201)
PICKSCHEME = BLOCK
The IPT operating quantity is given by:
where I
is equal to the zero-sequence current; I
0
for Blocking and Hybrid schemes or 0 for POTT and PUTT schemes. Since the test current, I
I
are given by:
1
I
= I
/ 3
(eq. 6–8)
0
op
and I
= I
/ 3
(eq. 6–9)
1
op
Substituting Equations 6–8 and 6–9 into Equation 6–7 and assuming a Blocking or Hybrid scheme yields
= I
– 0.066· I
PUIPT
op
= 0.934 I
op
Therefore IPT will pick up when I
2.
Connect the relay as shown in Figure 4–1: DIGITAL OUTPUTS TEST CONNECTIONS on page 4–9.
Set the voltage inputs to the following values: VA: 55 V rms ∠0°, VB: 67 V rms ∠–120°, VC: 67 V rms ∠+120°.
3.
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
to (PUIPB / 0.934) + 0.1 = [_________] amps rms and apply to the relay. The A1 contact should
op
close. Lower I
to (PUIPB / 0.934) – 0.1 = [_________] amps rms; the A1 contact should open.
op
6.
Reduce I
to zero.
op
GE Power Management
×
×
3
I
3
KTx I
–
0
the Positive-Sequence Current; and KT is 0.1 for Blocking and Hybrid
1
(eq. 6–6)
op
= PUIPT / 0.9.
op
×
×
×
3
I
3
KB
I
–
0
is equal to the positive-sequence current; and KB is equal to 0.066
1
(eq. 6–10)
op
= PUIPT / 0.934.
op
ALPS Advanced Line Protection System
(eq. 6–3)
1
, is single-phase, I
op
6.3.5 T8 – GROUND DIRECTIONAL BLOCK TEST, IPB + NB
(eq. 6–7)
1
6.3 MEASURING UNIT TESTS
and I
are given by
0
1
, is single-phase, I
op
0
6
and
6-7
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