TH2883 Series Operation Manual
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Titl e
Nu mber
Rev i sio n
Size
A4
Dat e:
2 6-Aug -20 0 4
Sheet o f
File:
E:\
赵浩华
\
产品设计图
\t h2 82 8 \t h2 82 8 (V2 .2 ). d db
Drawn By:
Lx
Vdc
C1
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DU T
Vo (t)
poor ventilation. In addition, the instrument will generate high voltage, so it must be used
at room temperature and in the absence of much dust.
1.1
Production introduction
Due to the influence of wire material, magnetic material, framework and manufacture technics,
winding products such as transformers, motor windings may have defects of low insulation
between winding layers, circles and leads. TH2883S series impulse winding tester, adopting
high-speed sampling techniques, is a new test instrument for insulation performance of winding
products.
TH2883S series compares the standard waveform stored in the non-volatile memory with the
current tested waveform. TH2883S series provides the PASS or FAIL comparison result
according to AREA SIZE, DIFFERENTIAL AREA, CORONA DISCHARGE or
DIFFERENTIAL PHASE. With its strong functions, accurate comparison methods, easy
operation and various interfaces, TH2883 can provide a perfect test solution for most winding
products.
Principles of impulse winding test
The impulse winding tester tests the electrical characteristics of coil winding without damaging the
DUT. The prerequisite condition is to test the quality of a coil at just a glance. The detection is
carried out when the same electric impulse, as used in the standard coil and here discharged by a
capacitor, is applied to the DUT. The voltage attenuation wave is generated in response to the
impulse, related to the Q-factor and inductance of the coil. In this sense, the tester can detect turn
and layer short, the differences in the number of turns and the material of the core. If high impulse
voltage is applied, the poor insulation will appear as a corona or layer discharge.
Figure 1-1 Simplified diagram for principles of impulse winding test
In figure 1-2, the self-oscillation attenuation wave has a close relation with the inductance L and
quality factor Q, while L and Q depend on the number of turn, manufacture technology,
properties of iron core material and whether it has air-coils. What’s more, the applied voltage is a
high impulse voltage, thus, it is easy to observe the short circuit, partial short turns and lays or
turns discharge phenomenon caused by insulation damage.
