OPERATION SUMMARY - Section 3
MTS-3000 SERIES OPERATION AND REFERENCE MANUAL 3-39
CU M004 01A
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Note that, whenever
Φ
-
Φ
or 3
Φ
mode is selected, the value of the phase to phase voltage and current are
displayed on the fourth line of the ACV and ACI module displays. Direct adjustment of the displayed
phase to phase quantity can be performed by selecting the F4 button adjacent to the desired output on the
WFG module. This is a much more efficient method than adjusting the magnitude and phase angles of the
individual vectors that sum to form the phase to phase quantity. For example, changing VAB from 120V to
100V actually changes four parameters: VAN changes from 69.28V, 0.0
°
to 60.83V, 355.3
°
, and VBN
changes from 69.28V, 240.0
°
to 60.83V, 244.7
°.
5.
Program the initial fault voltage. For the case shown in the display above, pressing F4 on the ACV
module will allow direct manipulation of the VAB voltage via the MODIFY keypad or rotary knob.
Note that the VAN and VBN values on lines F1 and F2 will move in sympathy to changes made to the
VAB output. Choose a voltage value higher than the expected operate value, but lower than the
nominal prefault value.
6.
Program the initial fault current. For the case shown in the display above, pressing F4 on the current
module will allow direct manipulation of the IAB current via the MODIFY keypad or rotary knob.
Note that the IAN and IBN values on lines F1 and F2 will move in sympathy to changes made to the
IAB value. Choose a current value lower than the expected operate value.
Note that, for phase-to-phase faults, if at least two current amplifiers are fitted to the current module,
the two fault phases of current will be programmed 180
°
apart, and the fault current seen by the relay
will be twice the individual
Φ
-G amplitude. This total current value is what appears on line F4 of the
display, and is what the relay sees.
7.
Program the initial fault phase angle. In most cases this will be the MTA or Maximum Torque Angle.
Press F3 on the Control Module and enter the phase angle via the MODIFY keyboard or rotary knob.
Notice that, once the value is entered, the phase angles on the current module are updated to reflect the
new setting.
8.
Press ENABLE to enable the AC outputs, and press PREFAULT to energize the outputs with the
prefault conditions.
3.3.15.2 REACH TEST.
1.
Press and hold the FAULT button. While holding the FAULT button, select and then lower the voltage
or raise the current (as described above) until the relay operates, as signaled by the illumination of the
Input 1 LED, and the operate tone (if selected to on). The reach or impedance value will be displayed
on the second line of the CM display while the FAULT button is held. Release the Fault button when
complete.
2.
To test at other phase angles, alter the phase angle as described in Step 7 of the previous section, and
again lower the voltage or raise the current until the relay operates.
3.
To check the reach of other phase elements of the relay, select the desired phase by pressing F4 on the
Control Module. This transfers the preset fault values to the selected phase. Repeat Steps 1 and 2, as
required.