OPERATION SUMMARY - Section 3
3-28 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
3.3.10.5 INSTANTANEOUS TEST.
The following procedure describes how to test the unrestrained instantaneous overcurrent element:
1. Depending upon the current required, one of two connections can be used for the current. If 30A or less
is required, the current coils can be left connected as shown in Figure 3.11, and I1&I2 current mode
used. If more than 30A is required, connect as shown in Figure 3.12. For the latter, select I1-HIGH
current mode.
2. Select static operation mode, and turn [PREFAULT] off.
3. Press and hold the [FAULT] button.
4. If using the I1&I2 current mode method, press [CURRENT] to display/adjust I1-AMPS, and adjust I1
to zero. Press [CURRENT] again, and increase I2 until the relay operates.
OR
If using the I1-HIGH current mode method, press [CURRENT], and increase the current until the relay
operates.
FIGURE 3.12 INSTANTANEOUS TEST FOR THREE-TERMINAL
CURRENT DIFFERENTIAL RELAYS
OP
R1
R2
DIFFERENTIAL
RELAY
Select I1-HIGH
current mode
+
I1
I1
R1
R2
OP