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Ct Vt Ratios: CT METERING
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 | ratio value (dimensionless) | standard burden VA (VA) | thermal rating factor trf (dimensionless) |
|---|---|---|---|---|---|
| CT METERING | 5000:5 | 0.3 | 1,000 | 25 | 1.5 |
| CT METERING | 600:5 | 0.3 | 120 | 12.5 | 1.5 |
| CT METERING | 75:5 | 0.3 | 15 | 12.5 | 1.5 |
| CT METERING | 800:5 | 0.3 | 160 | 12.5 | 1.5 |
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