DETAILED OPERATION - Section 4
MTS-3000 OPERATION AND REFERENCE MANUAL 4-7
CU M004 01A
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FIGURE 4.6 DIFFERENTIAL RELAY HARMONIC RESTRAINT TESTING
4.5.2
HARMONIC Current Mode
This current mode generates a current output which is the sum of a fundamental frequency current, and a
harmonic current. The harmonic may be from 2nd through to 10th harmonic. The fundamental current,
percentage harmonic, and phase relationship are adjustable. When a particular output channel is selected
for harmonic mode, a "h" is appended to its designator on the display. For example, IA will change to IAh
on the first line of the ACI module’s display.
1.
Program the fundamental current. For the above example, press FAULT, and then F1 on the ACI
module to select IA. Enter the desired fundamental current using the modify knob or keypad.
2.
Enter the following key sequence to select harmonic current mode for IA: MENU | Settings |
Harmonics | ACI 1
Φ
A Harm | Fund+Harm.
3.
The default harmonic is 2nd. If a higher harmonic is desired, select the line that displays Hrm #2, and
enter the desired harmonic with the modify knob or keypad.
4.
Now select Ampl n.n%, where n.n is a number you may set for % amplitude of harmonic via the
MODIFY knob or keypad.
5.
If it’s desired to change the waveshape of the harmonic output by altering the phase relationship of the
fundamental to the harmonic, select Phase 0.0
°
and rotate the MODIFY knob.
6.
Press ENABLE, followed by FAULT to activate the outputs.
7.
Press BACK to restore the previously displayed harmonic menu for access to the % harmonic setting.
