TH2829X Series Operation Manual Chapter 6 Transformer Single-machine Test
primary inductance is too small, the distributed voltage signal is small and the
transformer gets weak energy. As the test cable and relay will attenuate some
energy, the stability and the accuracy of test will be affected.
2) If the primary signal is enlarged, the secondary winding of the winding with
more turns will generate higher voltage which may beyond the acceptable
range thus affecting the test accuracy.
3) If the winding group with more turns is put in primary class, then the
transformer can get higher energy thus the two problems above can be
avoided.
6.1.3 Transformer leakage inductance test
When use the circuit discussed in last section to make automatic sweep test on
the leakage inductance of primary inductance L1, the instrument will
automatically use the relay to short the secondary winding of the transformer so
as to test the leakage inductance. From transformer secondary winding to inner
relay, the magnetic leakage is existed inevitably, so there is error of leakage
inductance in this zone. If user wants to obtain an accurate leakage value, please
short the secondary winding of the transformer based on the figure below.
6.1.4 Capacitance test between windings of transformer
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