Improper Structure of Distribution Transformer
IE Rules, 1956 specify several standard clearances to be maintained while distribution transformers are to be erected. The standard clearances adopted to transformer structures will avert its failure table 2.
Table 2: Clearances for Transformer Structures
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Transformer Structure
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Clearance
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HT bushing to ground
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13 feet
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ABS switch fixed contact to HG fuse
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7 feet
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Guy Shackle to ground
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10 feet
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If the length of the jumper is more than 5 inches
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LT/HT pin insulators are used to fix the jumper
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Non-adherence to these standards makes DTRs prone to failures.