Ct Vt Ratios: CT_METERING_IEC
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 | current error pct 100 (%) | current error pct 120 (%) | current error pct 20 (%) | current error pct 5 (%) | phase disp crad 100 (centiradians) | phase disp crad 120 (centiradians) | phase disp crad 20 (centiradians) | phase disp crad 5 (centiradians) | phase disp min 100 (minutes) | phase disp min 120 (minutes) | phase disp min 20 (minutes) | phase disp min 5 (minutes) | standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CT_METERING_IEC | 0.1 | 0.1 | 0.1 | 0.2 | 0.4 | 0.15 | 0.15 | 0.24 | 0.45 | 5 | 5 | 8 | 15 | IEEE Std 3004.1-2013 |
| CT_METERING_IEC | 0.2 | 0.2 | 0.2 | 0.35 | 0.75 | 0.3 | 0.3 | 0.45 | 0.9 | 10 | 10 | 15 | 30 | IEEE Std 3004.1-2013 |
| CT_METERING_IEC | 0.5 | 0.5 | 0.5 | 0.75 | 1.5 | 0.9 | 0.9 | 1.35 | 2.7 | 30 | 30 | 45 | 90 | IEEE Std 3004.1-2013 |
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