ABB REL300 Instruction Manual page 138

I.L. 40-385.7
Repeat AG fault and measure the trip time, which should be < 2 cycles. Change the setting of
T1 from 0 to 2. Repeat the test; the trip time should extend for an additional 2 cycles. Reset T1
to zero.
The following formula can be used when PANG
or
or
where
or
Example:
This is the trip current (4.3A) at the maximum torque angle of -57.76° (current lags voltage by
57.76°).
The following equation should be used for the angle of x on the MHO circle:
A-4
Vxg = (I + K I ) Zcg
0 0
X
K I

0 x
Vxg =
I +
----------- -

x
3
V
xg
I = ----------------------------- -
X
K

Z 1 + ------

cg
(
Z – Z
oL 1L
K = ---------------------------- -
0
Z
1L
∠ (
=
Z GANG PANG
R
I =
--------------------------------------------------------------------------------------------------------- -
X
jPANG
Z e
cg
I =
---------------------------------------------------------------------------------------- -
X
2
jPANG
-- - Z e
cg
3
Vag = 30 Z1g = 4.5
GANG = 40
Ia = ------------------------------------------------------------------ -
2
( )e
j85
-- - 4.5
3
=
------------------------------------------------------------------------------------------------------------------------------
(
3 cos 85
∠ – (
=
4.31 57.76
≠
GANG:

Zcg


o

3
)
) -1
–
V
xg
(
j GANG PANG –
Zr e
1 + ----------------------------------------------------------- -
3
V
xg
1
jGANG
+ -- - Z Z r e
cg
3
PANG = 85
Zr = 3
30
1
( ) 3 ( )e
j40
+ -- - 4.5
3
30
)+ j 3 sin (85) + 4.5 cos (40) + j4.5 sin (40)
)
)
– 1