ABB REL-300, Instruction Leaflet

Page: 108 / 135

I.L. 40-385.1B
6-6 (5/92)
(T
MSEC
) =
T
MSEC
= 1073 msec
= 1.073 sec
±
5 % to trip
For values of 3I
0
between 1.0 and 1.5, the following
equation would apply:
(T
MSEC
) =
The following equation can be used to calculate the
trip time for all CO curves from CO-2 to CO-11:
T(sec) =
T(sec) =
where
GBPU = Pickup current setting (0.5 to 4.0A).
GTC = Time curve dial setting (1 to 63).
T
o
, K, C, P and R are constants, and are shown in
Table 6-2.
Step 24. For a Zero Sequence Directional unit (DI-
RU = ZSEQ), the tripping direction of MDAR is:
the angle of 3I
0
leads 3V
0
b30
°
and
+210
°
. Change the setting of GDIR to “YES”. Ap-
ply AG fault as shown in preceding Step 10, Fig-
ure 6-1. The relay should trip at the following
angles:
• +28
°
• -60
°
(
±
88
°
)
• -148
°
The relay should not trip at the angles of:
• +32
°
• +120
°
(
±
88
°
)
• -152
°
For a Negative Sequence Directional Unit (DIRU =
NSEQ), the tripping direction of MDAR is: I
2
leads V
2
by a value b8
°
and +188
°
. The relay should
trip at the following angles:
• +3
°
• -82
°
(
±
85
°
)
• -167
°
The relay should not trip at the angles of:
• +13
°
• +98
°
(
±
85
°
)
• +183
°
Step 25. For a dual polarizing ground directional
unit (DIRU = DUAL) test, connect the test circuit
shown in Figure 6-4; apply lp 1.0A to ter-
minals 12 (+) and 11(-), and apply a balanced 3-
phase voltage (70V) to Va, Vb, Vc, and Vn. Apply
Ia = 4A to terminals 6(+) and 5(-).
NOTE: In order to eliminate the voltage polariz-
ing effect, make sure the voltages are
finely balanced so that 3V0 is less than
1.0 volt.
The relay should trip at the following angles:
• -3
°
• -90
o (
±
87
°
)
• -177
°
The relay should not trip at the following angles:
• +3
°
• +90
°
(
±
87
°
)
• +177
°
1.1.10 CIF, STUB, Iom, IL and LV Tests
Step 26. Set the relay per Table 6-1. Change the
following settings: Iom = 3, IL = 2, CIF = CIFT,
and connect a rated dc voltage to 52b, between
TB5/3 (+) and TB5/4 (-). Apply an AG fault as
shown in Step 10 (Figure 6-1). The relay should
trip at I
a
= 2A (IL) with CIF target. Change IL set-
ting from 2 to 3.5A and repeat the test shown in
Step 26. The relay should trip at I
a
= 3A (I
om
) with
CIF target.
Step 27. LV setting test. Set LV = 60 and with I
AN
=
4A, apply AG fault as shown in Step 10. The CIF
trip should be for V
AN
<60 Vrms
±
5%.
Step 28. For STUB Bus Protection (SBP), check
the blue jumpers on the Interconnect module.
478
4122
4.1/0.5 -1.27
------------------------------ +
24
24
------
9200
( )
3I
0
1 –
-----------------
GTC
24
------------
×
CO 8 only –
( )
T
0
K
3I
0
C –
( )
p
---------------------------
+
GTC
24 000
,
------------------ for 3I
0
1.5
≥ ( ) ×
R
3I
0
1 –
( )
----------------------
GTC
24 000
,
------------------
×
for 1 3I
0
1.5
< < ( )
3I
0
3I
OF
GBPU
-----------------
=
90
°
–
∠