OPERATION SUMMARY - Section 3
MTS-1700 SERIES OPERATION AND REFERENCE MANUAL 3-27
CU A002 15A
MANTA TEST SYSTEMS
3.3.10.2 SLOPE TEST.
1. Connect relay, as shown in Figure 3.11. Select I1&I2 current mode and static operation mode. Turn
[PREFAULT] off.
2. Press [CURRENT] to display/adjust I1 current. “I1-AMPS” should be indicated in the [MODE/MENU
DISPLAY]. Press and hold [FAULT], and increase the current to the desired restraint current value.
3. Press [CURRENT] again to display/adjust I2 current. Increase the operate current to 1A. Press
[PHASE], and check the phase between I1&I2. Adjust if necessary to
0°. Press [CURRENT], and
decrease the current to 0A.
4. Slowly increase the operate current (I2) until the relay operates. Record the I1 and I2 current readings.
Release the [FAULT] button.
5. Use the required formula to calculate slope. If the simple I2÷I1 formula applies, this can displayed
directly. Select DISP RATIOS CURRENT-RATIOS I2÷I1 via the menu. If the I2÷(I1+I2÷2) formula
applies, select DISP RATIOS CURRENT-RATIOS SLOPE I2÷((2I1+I2)÷2) in the menu.
6. To repeat at different values of restraint, repeat at step 2.
3.3.10.3 OPERATE TIME TEST.
1. If you haven’t done so, perform steps 1-3 of the slope test above.
2. Press [CURRENT] to display/adjust I2 current. Increase the operate current to the desired value.
Release the [FAULT] button.
3. Select dynamic operation mode. Press [FAULT] to perform the timing test.
4. When the relay operates, the [STOP/RESET] button will illuminate. Press [TIME] to see the operation
time. Press [TIME] again to toggle between display in seconds or cycles.
5. Press [STOP/RESET] to clear and prepare for next test.
3.3.10.4 HARMONIC RESTRAINT TEST.
1. Connect relay, as shown in Figure 3.11. (The relay doesn’t need to be connected to the MTS-1710 I1
output for this test). Select I2-HARMONIC current mode and static operation mode. Turn
[PREFAULT] on.
2. Press [CURRENT] to display/adjust I2 current. “I2-AMPS” should be indicated in the [MODE/MENU
DISPLAY]. Increase the current to the desired test value (usually equal to the tap value). The relay
should be operated*.
3. Press [CURRENT] to display/adjust %harmonic. “%-HARM” should be indicated in the [MODE/
MENU DISPLAY]. Increase the %harmonic until the relay restrains to determine the %harmonic
restraint value. The harmonic value defaults to second harmonic. For testing at higher harmonics, press
[FREQ] and turn the [MODIFY] knob to select the desired value.
NOTE: For halfwave harmonic testing, select DC-Amps.
4. Turn [PREFAULT] off.
*NOTE:
For latching trip elements, it may be necessary in step 2 to first set the %-harmonic to a high
value to restrain operation, and then to increase the fundamental current (I2-AMPS). Then,
in step 3, the % harmonic should be decreased until the relay operates.
For relays with harmonic restraint elements which are traditionally tested with half wave
rectified AC, such as the GE BDD 15/16 and ABB HO, see important additional information
in Application Note 23.