Ct Vt Ratios: CT_RELAYING
Standard current transformer (CT) and voltage transformer (VT) ratios, accuracy classes, burdens, and ratings per IEEE C57.13. Covers metering CTs (0.3 class), relaying CTs (C100–C800), and standard VT ratios.
| instrument transformer type | ratio designation | accuracy class | mechanical short time rating kA (kA) | ratio value (dimensionless) | standard burden VA (VA) | thermal rating factor trf (dimensionless) |
|---|---|---|---|---|---|---|
| CT_RELAYING | 100:5 | C100 | 40 | 20 | 100 | 1.5 |
| CT_RELAYING | 1200:5 | C400 | 40 | 240 | 400 | 1.5 |
| CT_RELAYING | 1500:5 | C800 | 61 | 300 | 800 | 1.5 |
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