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MTS-1720 TWO CHANNEL CURRENT SOURCE - Section 9
9-12 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
•
Identical settings to other similar current modes.
When performing three-phase testing in I3-WYE current mode, virtually the identical settings used in
I1-LOW and I3 current modes can be applied. Only the nominal
Φ
-N currents (if desired) also should
be set. Otherwise, the same current, voltage and phase settings apply.
The result of these aspects is reduced testing time and complexity, and subsequently improved
productivity.
9.4.2 Fault Modes
This section describes operation in various fault modes as these fault modes pertain to the current outputs.
For details on voltage outputs, see Section 4.7.
9.4.2.1
Φ
-N FAULT TYPE.
The
Φ
-N fault type allows display and adjustment of any single
Φ
-N current, and allows simulation of single
phase faults. Analogous to the voltage, the nominal
Φ
-N current settings are adjusted in this fault mode.
The PREFAULT settings of Ia, Ib, and Ic set in
Φ
-N fault type determine the current in unfaulted phases.
These settings are known as the nominal
Φ
-N currents.
The default settings for the nominal
Φ
-N currents is zero. The prefault interphase angles on the voltages and
currents are set to 120
°
.
Once the fault
Φ
-N (and postfault, if desired) current is set, it can be applied to any desired phase (A-N, B-
N and C-N) by changing the [FAULT PHASE] selector.
FIGURE 9.7 PHASE-GROUND FAULT
Example: To simulate the above single 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
-N A-N
Fault
5.0A
15V
70.0
°
Once the fault voltage, current and phase angle are set, they can be applied to any desired phase (A-N, B-
N, or C-N) by changing the [FAULT PHASE] selector.
Va
Vc
Vb
Ia
Ib
Ic
Ic
Ib
Ia
Vb
Vc
Va
PREFAULT
FAULT
0
TYPICAL SETTINGS
PREFAULT FAULT
CURRENT:
VOLTAGE:
PHASE V-I:
1.0A
70V
10 deg.
5.0A
15V
70 deg.
FAULT MODE = 0-N A-N