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Ct Vt Ratios: CT RELAYING
5000:5 to 800:5
CT and VT standard ratios, accuracy classes, burden designations, and IEC/IEEE accuracy limits per IEEE C57.13 and IEEE Std 3004.1-2013. Covers metering CTs, relaying CTs (C-class), standard CT/VT burdens, and IEC accuracy limits.
| 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 | 5000:5 | C800 | 61 | 1,000 | 800 | 1.5 |
| CT RELAYING | 600:5 | C400 | 40 | 120 | 400 | 1.5 |
| CT RELAYING | 75:5 | C100 | 40 | 15 | 100 | 1.5 |
| CT RELAYING | 800:5 | C400 | 40 | 160 | 400 | 1.5 |
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