Voltech AT3600 User Manual page 151

V AT3600 U
OLTECH SER
4.27. SURG - S
U
NDER NO CIRCUMSTANCES SHOULD THE SURGE BE APPLIED TO
THE INPUT WINDING OF A STEP UP TRANSFORMER SUCH THAT ITS
The purpose of this test is to detect an inter-turn short by applying a number of high
voltage impulses (or surges) to the selected winding.
Each impulse produces a sinusoidal transient which eventually decays to zero.
During the test, the tester measures the area (in Volt - seconds) under each transient.
The decay is much shorter in a faulty winding, and is detected as a smaller value for
the measured area.
On selecting 'SURG Stress Test - Surge' from the Available Tests window, the
following form-fill dialogue box will be displayed:
To program the test :
1. Enter the desired test voltage.
2. Enter either a nominal winding inductance or select AUTO mode.
T P E
EST ROGRAM DITOR
M
ANUAL
OUTPUT IS BIGGER THAN
When a fixed inductance is entered, the AT3600 uses this value to estimate the
frequency and duration of the transient waveform and thus determine the digital
waveform sampling rate that is used.
S
URGE TRESS
W
ARNING
VPN 98 - 024
P
ROGRAMMING
T
EST
7 V
K
T
ESTS
P 3.4.45.
AGE