Transformer Differential Relay Test Report of Siemens RelayFull description
7ut Transformer Test
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Descripción: power transformer
transformer
M a g n e t i c b a l a n c e t es e st o f t r a n sf o r m er Magnetic balance test of transformer is conducted only on three phase transformers to check the imbalance in the magnetic circuit. P r o c ed e d u r e o f M a g n e t i c b a l a n c e t e st st o f t r a n s f o r m e r
1) 2)
First Now
keep
the
tap
disconnect
changer the
of
transformer
transformer
in
normal
position.
from
ground.
neutral
3) Then apply single phase 230V AC supply across one of the HV winding terminals
and
neutral
terminal.
4) Measure the voltage in two other HV terminals in respect of neutral terminal. 5) Repeat the test for each of the three phases. In case of auto transformer, magnetic balance test of transformer should be repeated for IV winding also. There are three limbs side by side in a core of transformer. One phase winding is wound in one limb. The voltage induced in different phases depends upon the respective position of the limb in the core. The voltage induced in different phases of transformer in respect to neutral terminals given in the table below.
