ADVANCED OPERATION - Section 5
MTS-1700 SERIES OPERATION AND REFERENCE MANUAL 5-23
CU A002 15A
MANTA TEST SYSTEMS
Example display:
DEG:v-I Z1gnd=4.183
Ω
Φ
-N B-N I3
NOTE:
This display is not valid for I3-WYE current mode in cases where unfaulted phases have non-zero
current because we assumed the residual current is equal to the fault current for this calculation.
The K-factor can be specified directly via the menu selection DISP RATIOS IMPEDANCE K-factor, or
indirectly as the ratio of Z0÷Z1 via the menu selection DISP RATIOS IMPEDANCE Z0÷Z1. The
Z0÷Z1 value is typically used by GE.
5.10.3.1.2 Automatic impedance display selection
This feature lets the MTS-1710 automatically select the proper impedance formula for display based upon
the present fault mode. This circumvents the need to change the display selection when changing fault types
in testing a multiple element relay.
To use this feature, select DISP RATIOS IMPEDANCE AUTO Z1 in the menu. The automatic impedance
display selection is made according to the following table:
To turn off the impedance display, select DISP DEFAULT, or any other desired display mode in the menu.
5.10.3.1.3 Automatic resistance display selection
This feature is similar to the automatic impedance display selection mode described in 5.10.3.1.2 above,
except that the resistive component of the positive sequence impedance is displayed.
To use this feature, select DISP RATIOS IMPEDANCE AUTO R1 in the menu.
5.10.3.1.4 Automatic reactance display selection
This feature is similar to the automatic impedance display selection mode described in 5.10.3.1.2 above,
except that the reactive component of the positive sequence impedance is displayed.
To use this feature, select DISP RATIOS IMPEDANCE AUTO X1 in the menu.
Fault Mode Type
Selected Impedance formula
MTS-1710 only
MTS-1710 + MTS-1720
Φ
-N
V÷(I + KI)
V÷(I + KI)
Φ
-
Φ
V÷2I
V÷I
3Φ
(
Φ
-
Φ
)
V÷
I
V÷I
3Φ
(
Φ
-N)
V÷I
V÷I
2Φ
-N
V÷2I
V÷I
3