Table 1a
|Table 1 (All Classes in 1 Table) |
|This revision combines the Delta and the Wye-Connected Tables from Revision 8 into the new Revision 9 |
|Max |Nominal |Applied Test |Induced Test, in kV |Basic Insulation Level, in kV |Neutral BIL, in kV |
|System |System |From C57.12.00 | | | |
|Voltage in |Voltage (V,|Table 7 in kV | | | |
|kV |in kV) | | | | |
| | | |Dist. & |Class 2, >72.5 kV | | |
| | | |Class I | | | |
| |
|1.5 |
|120 |
|Max |Nominal |Applied Test |Induced Test in kV |Basic Insulation Level |Neutral BIL (kV) |
|System Voltage |System |From C57.12.00 |[pic] |(kV) | |
|(kV) |Voltage |Table 7 (kV) | | | |
| |(kV) | | | | |
| |
|1.5 |
|1.5 |
|Max |Nominal |Applied Test |Induced Test (kV) |Basic Insulation Level (kV) |Neutral BIL (kV) |
|System |System |From C57.12.00 | | | |
|Voltage |Voltage |Table 7 (kV) | | | |
|(kV) |(kV) | | | | |
| | | |Class 1 |Class 2, >72.5 kV | | |
| | | | | | | |
| |
|120 |
|BIL |Chopped Wave |Front Of Wave |Switching Impulse |
|kV Crest |kV Crest |Minimum |kV Crest |Minimum |kV Crest |
|1.2 X 50 |1.1*BIL |Time to | |Time to |0.83*BIL |
|μ-sec | |Flashover, μ-sec | |Flashover, μ-sec | |
|30 |33 |1.0 | | | |
|45 |50 |1.5 | | | |
|60 |66 |1.5 | | | |
|75 |83 |1.5 | | | |
|95 |105 |1.8 |165 |0.5 | |
|110 |120 |2.0 |195 |0.5 | |
|125 |138 |2.3 |220 |0.5 | |
|150 |165 |3.0 |260 |0.5 | |
|200 |220 |3.0 |345 |0.5 | |
|250 |275 |3.0 |435 |0.5 | |
|350 |385 |3.0 |580 |0.58 |280 |
|450 |495 |3.0 |N/A unless specified |375 |
|550 |605 |3.0 |N/A unless specified |460 |
|650 |715 |3.0 |N/A unless specified |540 |
|750 |825 |3.0 |N/A unless specified |620 |
|825 |900 |3.0 |N/A unless specified |685 |
|900 |990 |3.0 |N/A unless specified |745 |
|1050 |1155 |3.0 |N/A unless specified |870 |
|1175 |1290 |3.0 |N/A unless specified |975 |
|1300 |1430 |3.0 |N/A unless specified |1080 |
|1425 |1570 |3.0 |N/A unless specified |1180 |
|1550 |1705 |3.0 |N/A unless specified |1290 |
|1675 |1845 |3.0 |N/A unless specified |1390 |
|1800 |1980 |3.0 |N/A unless specified |1550 |
|1950 |2145 |3.0 |N/A unless specified |1620 |
|2050 |2255 |3.0 |N/A unless specified |1700 |
Notes:
1. Front-of-Wave tests must be specified prior to the design of the transformer.
2. Front-of-wave tests are not recommended on low voltage or tertiary windings that are not exposed to lightning.
3. The Insulation levels for Distribution, Class 1 and Class 2 transformers shall be selected from this table for both the high-voltage and low-voltage windings.
4. Phase to ground specified Switching impulse levels are not always possible for low voltage windings.
|Table 1b |
|This revision combines the Delta and the Wye-Connected Tables from Revision 8 into the new Revision 9 |
|Max |Nominal |Applied Test |Induced Test |Basic Insulation Level |Neutral BIL |
|System |System |From C57.12.00 |[pic] | | |
|Voltage (V) |Voltage (V) |Table 7 | | | |
| |
|1.5 |
|1.5 |
|BIL |Chopped Wave |Front Of Wave |Switching Impulse |
|kV Crest |kV Crest |Minimum |kV Crest |Minimum |kV Crest |
|1.2 X 50 |1.1*BIL |Time to | |Time to |0.83*BIL |
|μ-sec | |Flashover, μ-sec | |Flashover, μ-sec | |
|30 |33 |1.0 | | | |
|45 |50 |1.5 | | | |
|60 |66 |1.5 | | | |
|75 |83 |1.5 | | | |
|95 |105 |1.8 |165 |0.5 | |
|110 |120 |2.0 |195 |0.5 | |
|125 |138 |2.3 |220 |0.5 | |
|150 |165 |3.0 |260 |0.5 | |
|200 |220 |3.0 |345 |0.5 | |
|250 |275 |3.0 |435 |0.5 | |
|350 |385 |3.0 |580 |0.58 |280 |
|450 |495 |3.0 |N/A unless specified |375 |
|550 |605 |3.0 |N/A unless specified |460 |
|650 |715 |3.0 |N/A unless specified |540 |
|750 |825 |3.0 |N/A unless specified |620 |
|825 |900 |3.0 |N/A unless specified |685 |
|900 |990 |3.0 |N/A unless specified |745 |
|1050 |1155 |3.0 |N/A unless specified |870 |
|1175 |1290 |3.0 |N/A unless specified |975 |
|1300 |1430 |3.0 |N/A unless specified |1080 |
|1425 |1570 |3.0 |N/A unless specified |1180 |
|1550 |1705 |3.0 |N/A unless specified |1290 |
|1675 |1845 |3.0 |N/A unless specified |1390 |
|1950 |2145 |3.0 |N/A unless specified |1550 |
|1950 |2145 |3.0 |N/A unless specified |1620 |
|2050 |2255 |3.0 |N/A unless specified |1700 |
Notes:
1. Front-of-Wave tests must be specified prior to the design of the transformer.
5. Front-of-wave tests are not recommended on low voltage or tertiary windings that are not exposed to lightning.
6. The Insulation levels for Distribution, Class 1 and Class 2 transformers shall be selected from this table for both the high-voltage and low-voltage windings.
7. Phase to ground specified Switching impulse levels are not always possible for low voltage windings.
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