OPERATION SUMMARY - Section 3
3-22 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
2. Connect relay as shown in Figure 3.9. Select I3 current mode and static operation mode. Turn
[PREFAULT] on, press [CURRENT], and adjust current to 0A.
3. Select
Φ
-N/A-N fault mode, press [VOLTAGE], and set the nominal
Φ−Ν
voltage (69.28V default).
Do the same for B-N and C-N.
3.3.9.2 REACH TEST.
The following procedure tests the reach of an impedance element at a given angle:
Preparation
1. Perform steps 1-3 in the Preparation Section (3.3.9.1).
Select fault type and phase
2. Select the desired fault type
Φ
-
Ν,
Φ
-
Φ
,
or
3
-
Φ
elements. For
Φ
-N and
Φ
-
Φ
fault types, select the
desired fault phase.
Determine reach
3. Press and hold the [FAULT] button, or short the [EXTERNAL START] contact inputs. Press
[CURRENT] and set starting fault current (e.g. 5A). This is necessary to set the phase angle.
4. Press [PHASE] and adjust the phase angle to the MTA or desired value. When using
Φ
-
Φ
and 3
Φ
(
Φ
-
Φ
)
fault types, it’s not necessary to account for any
3
0° offset. The angle displayed is the angle which
relay sees. For example, if the MTA is 75° offset, adjust the phase until the MTS-1710 reads 75°.
5. Press [VOLTAGE] and decrease the voltage until the relay operates. You can also press [CURRENT]
and increase the current. When the relay contacts close, the [TONE] button will light. The [TONE]
button also toggles an audible tone on or off.
6. To display reach directly, activate the impedance display feature (see Section 5.10.3.1).
Repeating for other angles/elements
7. To test at different phase angles, repeat at step 4. To test other elements (A-N, B-N, C-N, A-B, B-C, C-
A), simply rotate the [FAULT PHASE] selector. The preset fault quantities will be immediately
applied to the new phase, providing for rapid testing. Release the [FAULT] button or [EXTERNAL
START] contact input when finished.
8. To test other fault types (
Φ
-N,
Φ
-
Φ
, 3
Φ
), repeat at step 2.
3.3.9.3 MTA TEST.
The following procedure determines the maximum torque angle of an impedance element:
1. If you haven’t done so, perform steps 1-3 in the Preparation section (3.3.9.1).
2. If you haven’t done so, perform steps 2-5 of the reach test above to find the reach at the theoretical
MTA. Decrease the voltage, or increase the current slightly, to move the impedance further into the
region of operation.
3. Press [PHASE], and increase the phase angle until the relay opens. Record this phase angle value.
4. Adjust the phase angle to the nominal MTA. Decrease the phase angle until the relay opens again.
Record this value. When using
Φ
-
Φ
and 3
Φ
(
Φ
-
Φ
) fault types, it’s not necessary to account for any 30°
offset.