Woodward
Manual XRI1-ER
30
TD_XRI1-ER_12.03, Rev. C
In order to test the directional feature, parameters have to be set in compliance with table 7.2. Then a test volt-
age equivalent to the rated voltage is connected to terminals L1/N1 and a current of 0.4 x In is impressed upon
the current inputs 1E1/1E2.
It is now possible to read and check all measured values in accordance with Table 7.1. If the phase position is
changed, the values I
Q
and I
P
change. If the angle is changed by 90°, for example, the measured value for cur-
rent input E must be ±0 for I
P
and +0.4 for I
Q
.
Determining the change in direction
The tripping direction is determined by the sin- or cos-method. When testing the sin-method, the current must
be adjusted 90° lagging in relation to the voltage and a definite direction in the forward range must be recog-
nizable.
Current in-
put
Terminals
Reference-
voltage
Terminals
Display
E
I
P
I
Q
U
E (ER-type)
1E1/1E2
100 V
L1/N1
0.40
±0.3%
±0.4
±0.3%
±0.0
±3%
100V
±1%
E (XR-type)
1E1/1E2
100 V
L1/N1
4.0
±0.03%
±4.0
±0.03%
±0.0
±0.03%
100V
±1%
Table 7.1: Connection of test currents and voltages and corresponding display values
For relay assignment:
Parameter
Relays
IE> Alarm (V)
_2__
IE> Alarm (R)
__3_
Parameter
Setting
IE>
0.2 x In
tIE> (V)
EXIT
tIE> (R)
EXIT
sin/cos
sin
Table 7.2: Necessary parameter setting and relay assignment
A test current of 0.4 x In is impressed upon the current input. The voltage source is to be connected as pro-
vided for in Table 7.1. With an angle setting of 90o leading, relay 2 must respond and LED
→← lights up green.
If the angle is now changed beyond the marginal regions, the LED
→← changes from green to red. Relay 2
drops and relay 3 responds.
To check the trip delays for forward and backward direction they have to be set differently, because there's only
one trip relay for both directions.
Great care must be taken to connect the test current and test voltage to the relay in correct phase angle and po-
larity. In Figure 7.1 the relay and test source polarity are indicated by a * mark near the terminals. The markings
indicate that the relay will trip in its maximum sensitive angle when the voltage drop from the marked end to the
non-marked end in the voltage input circuit has 49° phase angle lagging the current flowing from the marked
end to the non-marked in the current input circuit. Of course, regardless of polarity, the current level must be
above the pickup value.