Energomera CE308 - Annex A: Permissible Error Limits; Permissible Error Limits for Current Measurement; Permissible Error Limits for Voltage Measurement

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ANNEX A
(required)
The permissible error limits of the measured values
A.1 The limits of the permissible basic relative error when measuring the root-mean-square values of current δ , in
percent, do not exceed the values shown in Table A.1.
Table А.1
Current value for meters
Limits of permissible basic error δI, %, for active/
reactive energy accuracy class meters
with direct connection connected via transformer 0.5S/0.5 1/1
0,05 I
b ≤ I ≤ Imax 0,05 Inom ≤ I ≤ Imax
±1.0 ±2.0
A.2 The limits of the permissible basic relative error when measuring the root-mean-square values of phase
voltage δ U, in percent, do not exceed the values shown in Table A.2.
Table А.2
Voltage value
Limits of the permissible basic error δ
U, %,
for accuracy class meters
0.5S/0.5 1/1
0.6 (0.75)* U
nom ≤ U ≤ 1,21 Unom
±0.5
*For meter versions with 57.7 V nominal voltage