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MTS-1720 TWO CHANNEL CURRENT SOURCE - Section 9
MTS-1700 SERIES OPERATION AND REFERENCE MANUAL 9-13
CU A002 15A
MANTA TEST SYSTEMS
9.4.2.2
Φ
-
Φ
FAULT TYPE.
The
Φ
-
Φ
fault type allows simulation of
Φ
-
Φ
faults.
When this fault type is selected, the current display shows the phase current (Iab, Ibc or Ica), as selected by
the fault phase. This is
times the line current (Ia, Ib or Ic) in prefault and postfault states, but twice the
line current in fault state.
In the FAULT state, the current phases participating in the fault will have equal magnitudes and opposite
phase angle. The unfaulted phase always will remain at its nominal
Φ
-N current setting and prefault angle.
In prefault state, the interphase angles on the voltages and currents are set to 120
°
.
Once the prefault, fault (and postfault, if desired) currents are set, they can be applied to any desired phase
(A-B, B-C, C-A) by changing the [FAULT PHASE] selector.
FIGURE 9.8 PHASE-PHASE FAULT
Example To simulate the above phase-to-phase fault, set up the following values:
Fault mode
Fault state
Current
Voltage
Phase V-I
Φ
-N A-N
Prefault
1.0A
70V
10.0
°
Φ
-N B-N
Prefault
1.0A
70V
Φ
-N C-N
Prefault
1.0A
70V
Φ
-
Φ
C-A
Prefault
1.732A
120V
Φ
-
Φ
C-A
Fault
10A
65V
75.0
°
Once the fault voltage, current and phase angle are set, they can be applied to any desired phase (A-B, B-C,
or C-A) by changing the [FAULT PHASE] selector.
9.4.2.3 3
Φ
FAULT TYPES.
The 3
Φ
fault types adjust three-phase current.
All three currents are set to the same amplitude simultaneously. However, only one current can be
measured/displayed at a time.
The 3
Φ
(
Φ
-
Φ
) fault type allows measurement/display of phase currents (Iab, Ibc, Ica). The 3
Φ
(
Φ
-N) fault
type allows measurement/display of line currents (Ia, Ib, Ic).
In all fault states, the interphase angles on the voltages and currents are 120
°
.
3
75 deg.
65V
10A
10 deg.
120V
1.73A
PHASE V-I:
VOLTAGE:
CURRENT:
PREFAULT FAULT
TYPICAL SETTINGS
FAULT
PREFAULT
Vab
Vca
Vbc
Ia
Ib
Ic
0
Ibc
Iab
Ica
Vbc
Vca
Vab
FAULT MODE = 0-0 C-A