Monday, June 15, 2009

TRANSFORMER TESTING AT SITE

Everyone knows before commissioning or charging any equipment it must be need to test before putin to service, like that the new transformer is also need to ensure everything is fine. So, some tests are required to confirm. those are all called Pre-commissioning tests.some important tests are mentioned here for easy ref,

i) Insulation Resistance or Meggar Value with PI (Polarization Index)
ii) Turns / voltage Ratio
iii) Magnetic Balance
iv) Magnetizing current
v) Oil tests (BDV, PPM and DGA (for future ref))
vi) Protections (Differential, IDMT, Bucholz Relay,OTI, WTI, PRV, OSR, MOG, Fans and pumps)
vii) Operation of OLTC or OCTC/OCKT
viii) Vector Group Test

Testing methods will be described in next post.

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