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DETAILED OPERATION - Section 4
4-14
MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
4.6.2
Il-HIGH Current Mode
I1-HIGH current mode is used for instantaneous tests requiring more than 30A output.
In this mode, the main current amplifier is connected via an internal boost CT to the [I1 OUTPUT]
terminals. The output is AC-coupled, and isolated from all outputs and inputs.
To adjust I1 current, press [CURRENT], and turn the [MODIFY] knob. Note there are prefault, fault and
postfault current settings, and the setting which is adjusted depends upon the present fault state.
4.6.3
I3 Current Mode
I3
current mode allows the single-phase
current source to be switched to any pair of the
[I3 OUTPUT]
terminals (indicated in red on the front panel). These terminals are also used as I1 and I2 outputs.
In I3
current mode, they’re configured as a
3
Φ
,
four-wire output as indicated by the red A,B,C & N labels.
As a result, any 3-
Φ
,
three-wire or 3-
Φ
,
four-wire system may be tested one phase at a time, without
moving wires during the test, by supplying its inputs from the appropriate I3 outputs.
The current path is selected by the [FAULT PHASE] selector, and is indicated in the lower left corner of
the [MODE/MENU DISPLAY].
For example, if the fault mode is
3-
Φ
A-B, the current exits the A terminal, and returns through the B
terminal. The C and N terminals are dead (open-circuited).
Current
Fault Phase Output Return
A-N A N
B-N
B N
C-N C N
A-B A B
B-C B C
C-A C A
4.6.4
I3-WYE Current Mode
I3-WYE
current mode provides full 3
Φ
current, and requires the MTS-1720. Use of this current mode is
described in Section 9.4.