Manual

30 Gossen Metrawatt GmbH
8.3.2 Inter-Turn Short Circuit Measurement with the ADAPTER
XTRA*
In combination with the optional COIL ADAPTER XTRA, inter-turn
short circuit measurements with a test voltage of 1000 V are pos-
sible within an inductance range of 10 μH to 5 H (100 Hz).
Switch set to High: 5 mH to 5 H
Low: 10 μH to 50 mH
This range corresponds to motors in accordance with DIN stan-
dards with power ratings of roughly 0.16 kVA to 80 MVA.
Switch set to High: from roughly 0.16 kVA to 160 kVA
Low: from roughly 15 kVA to 80 MVA
A time value which depends on the inductance of the respective
coil is ascertained for each motor coil or coil combination, one after
the other, during this measurement with high-voltage. A compari-
son of the time values makes it possible to check the motor coils
for symmetry, and thus to detect an inter-turn short circuit.
8.3.2.1 Preparing for Measurement
Note
Inter-turn short circuit measurements may only be con-
ducted on voltage-free coils.
➭ Set the rotary switch to “
RISO ” or “ COIL ”.
➭ Repeatedly press the Func softkey until the measurement view
for COIL appears at the display.
Note
After connecting the COIL ADAPTER XTRA to the multi-
meter, manual selection of measurement type and polar-
ity is unnecessary (see “Connection and Contacting” on
page 31). Measurement type is automatically set to 3-
phase motor measurement and polarity is automatically
set to bipolar after connection.
➭ You can view the automatically selected measurement type
and polarity mode under “Setup for present measurement”.
*
as of firmware version 1.003.000
S– A
V
Temp
m/4
COIL
S+
0V!
!
V
U
W
Example
COIL /
COIL ADAPTER XTRA
with Star Connection
Connect COIL ADAPTER XTRA
and measurement cables
U
Surge max
1200 V!
Pulse currents up to
RISO
COIL
V
U
W
L1
L3
L2
Example
with Delta Connection
High
Low
U-V
U-W
V-W V-U
W-U
W-V
0
600 A are possible!
UVW