Routine Transformer
Test Report
Report Content
2. Acceptance Criteria
1.
1. Report content
• Prepared according to ISO-17025 (2017) standard
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Title
Name & address of the lab
Customer name & Address
Date
ISO-17025(2017)
7.8.2
• Environmental Conditions
• Measurement Uncertainties
ISO-17025(2017)
7.8.1
• Reviewed & authorized results
ISO-17025(2017)
7.1.3
• Details of the Transformer
2. Acceptance Criteria
• Insulation Resistance Test
Transformer Coil Rating / ( V )
Minimum Insulation Resistance
Liquid Filled / (MΩ)
Dry / (MΩ)
0 – 600
100
500
> 600
600
1000
• Voltage Ratio Test
Allowable Deviation - ± 0.5 %
• Applied potential Test
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Test successful if no collapse of voltage occurs
• Induced Potential Test
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Test successful if no collapse of voltage occurs
• No Load Loss Test
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Deviation of the measured values should be less than +15 %
of Guaranteed values
• Load Loss Test
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Deviation of temperature corrected Full Load loss values should be less
than +15 % of Guaranteed values
Deviation of temperature corrected Total Load loss values should be less
than +10 % of Guaranteed values
Impedance values
• At principal tapping ±10 %
• At any other tapping ±15 %
• Oil Breakdown Voltage Test
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Mean value ≥ 30 kV