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IEC-to-ANSI Clause Check
Nine clauses behave differently between IEC 60076-1 and IEEE C57.12.00. Tell the tool which basis your specification is written on and what you intend to hold the supplier to, and it returns the lines that need restating in the purchase order.
| Clause | IEC 60076-1 (2011) | IEEE C57.12.00-2010 | Put this in the purchase order | Priority |
|---|---|---|---|---|
| Load-loss reference temperature | 75 °C | 85 °C | Name the reference temperature the guarantee is quoted at. Two offers on different bases are not comparable. | |
| No-load-loss reference temperature | 75 °C, measured at factory temperature, no correction | 20 °C core-loss reference with a correction equation | State whether a temperature correction to the reference is required on the test report. | |
| Loss tolerance | +15 % on an individual loss, total not above +10 % | No-load +10 %, total +6 % | Restate the tolerance you will hold and the penalty formula for exceeding it. | |
| Excitation (no-load) current | Maximum +30 % of design value | Not specified | Fix the no-load current guarantee explicitly rather than relying on the standard. | |
| Load-loss test current | May be measured down to 50 % of rated current | Full rated current required | Require full-current measurement if a partial-current test would not satisfy your engineer. | |
| Test supply frequency | Within 1 % of rated | Within 0.5 % of rated | Adopt the tighter of the two figures in the test plan. | |
| Voltage waveshape | Total harmonic content up to 5 % | Not specified | State the acceptable waveform correction limit for the loss measurement. | |
| Three-phase symmetry | Phase voltage spread up to 3 % | Not specified | Carry the IEC limit forward as an explicit test condition. | |
| Maximum waveform correction | 3 % between average and r.m.s. voltage | Above 5 % the waveform must be improved | Agree which rule governs before the witness test is scheduled. |
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