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ADVANCED OPERATION - Section 5
MTS-1700 SERIES OPERATION AND REFERENCE MANUAL 5-41
CU A002 15A
MANTA TEST SYSTEMS
5.12.4 Special Notes
Once the phase adjustment mode is set to “individual-voltage” or “individual-current”, any action, which
would usually change the phase of one or more outputs, will no longer do so. This includes the following:
1.
Changing phase-to-phase voltage (in
Φ
-
Φ
fault types
)
2. Changing phase sequence
3. Changing [FAULT PHASE] selector
Due to the method in which the MTS-1710 controls phase, changing the harmonic setting (or harmonic
range in variable frequency reference mode) will change the individual phase settings. As a result, always
select the desired frequency and harmonic before changing individual phase settings.
The programmable phase resolution changes with harmonic setting. The resolution is 0.25
°
times the
harmonic number.
The VC phase settings in individual phase adjust modes are invalid if synchronizing mode is active.
Similarly, I1 phase settings in individual phase adjust modes are invalid if I1&I2 current mode is selected
and synchronizing mode is active. Also, I2 phase settings in individual phase adjust modes are invalid in I2-
HARMONIC current mode, since I2 is a fundharmonic, and the voltages run at the harmonic
frequency.
5.12.5 Example - Use of Individual Phase Adjust for Synchronizing Device Testing
An alternate method for testing synchronizing devices to the one described in Section 3.3.12 uses the
individual phase adjustment feature. This method also allows AC current to be used (required for some new
synchronizing devices).
5.12.5.1 PHASE ANGLE LIMIT TEST.
1.
Make test connections, as shown in Figure 3.15.
2.
Select static operation mode,
Φ
-N/A-N fault mode and I1-LOW current mode.
3.
Turn [PREFAULT] on, press [VOLTAGE] and set Va to the required nominal voltage.
4.
Select C-N fault phase and set Vc to the required nominal voltage (usually same as VA).
5.
In the menu, select SETTINGS MODES PHASE INDIVIDUAL-ADJ-MODE ENABLE.
6.
Press [PREVIOUS] and select ADJUST PREFAULT in the menu. A display similar to the following
should appear:
7. Now we are going to use Va & Vc as the generator and bus (or line and bus) voltages respectively. Turn
the [MODIFY] knob to position the cursor over Vc, and press [SELECT].
8. Adjust the angle of Vc to be the same as Va. This places the synchronizing voltage and reference voltage
in phase.
VA:000.0° vB:240.0°
vC:120.0° I1:0.0°
vA:000.0° vB:240.0°
vC:000.0° I1:000.0°