VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.1.
1. TRANSFORMER TESTS
1.1. APPLICATION OF TESTS
The following table summarizes the tests available for the AT3600 and indicates where they might be used:
Test Description Main Application Winding Tested Reason for Test
CTY Continuity All transformers Properly installed fixture
R DC Resistance All transformers All windings
Properly installed fixture
Correct wire used
Integrity of terminations
LS
Inductance
(Series circuit)
LP
Inductance
(Parallel circuit)
Correct primary turns
Right grade of core material
Core correctly assembled
QL Quality Factor
RLS
Equivalent Series
Resistance
RLP
Equivalent Parallel
Resistance
D Dissipation Factor
Most transformers
But usually not line frequency
transformers
One winding usually the
primary
Right grade of core material
Core correctly assembled
Check for shorted turns
LL
LLO
Leakage Inductance
SMPS transformers
Communication transformers
Others as applicable
Selected windings
Check windings have been
installed in the correct position
relative to the core
C Interwinding Capacitance
High frequency transformers
Isolating transformers
Check winding positioning Check
insulation thickness between
windings
TR Turns Ratio and Phasing
Most transformers, but usually
not line frequency
transformers
All windings
Check windings have correct
turns and phasing
TRL
Turns Ratio by
Inductance
As with Turns Ratio but used
where there is poor flux
linkage between windings.
All windings
Check windings have correct
turns and phasing
MAGI Magnetising Current
MAGX MAGI (External Source)
One winding, usually the
primary
Correct primary turns
Correct core material properly
assembled
VOC Open Circuit Voltage
VOCX VOCX (External Source)
LVOC
Low Voltage
Open Circuit
Usually line frequency
transformers
All other windings
Correct secondary turns
Correct phasing
IR Insulation Resistance All transformers Between selected windings
Winding isolation check where
safety is not involved
HPDC Hi-Pot (DC)
HPAC Hi-Pot (AC)
All transformers especially
those used for safety
insulation
Between selected windings
usually primary to secondary,
screens and core
High voltage safety insulation
LSB
Inductance with Bias
Current (Series Circuit)
LPB
Inductance with Bias
Current (Parallel Circuit)
Transformers for use in
applications where passing
significant (dc) bias current is
part of the normal operation
One winding
Correct number of turns
Right grade of core material
Core correctly assembled
WATT Wattage
WATX WATT (External Source)
50Hz Iron core transformers One winding
Correct core material
Properly assembled
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