AS 62053.22:2018 pdf free
AS 62053.22:2018 pdf free.Electricity metering equipment (ac) – Particular requirements
The test shall be carried out as follows: after the voltage circuits have been energized at reference voltage for at least 2 h without any current in the current circuits, the maximum current shall be applied to the current circuits. 1 The meter error shall be measured at unity power factor immediately after the current is applied and then at intervals short enough to allow a correct drawing to be made of the curve of error variation as a function of time.
The test shall be carried out for at least 1 h, and in any event until the variation of error during 20 min does not exceed 0,05 %.
The continuous magnetic induction may be obtained by using the electromagnet according to Annex B, energized with a d.c. current. This magnetic field shall be applied to all accessible surfaces of the meter when it is mounted as for normal use. The value of the magneto-motive force applied shall be 1 000 At (ampere-turns).
1) If the tests are made at a temperature other than the reference temperature, including permissible tolerances,the results shall be corrected by applying the appropriate temperature coefficient of the meter.
2) The test consists of:
a) for a single-phase meter, determining the errors first with the meter normally connected to the mains and then after inverting the connections to the current circuits as well as to the voltage circuits. Half of the difference between the two errors is the value of the variation of error. Because of the unknown phase of the external field, the test should be made at 0,05 In at unity power factor and 0,1 In at 0,5 power factor;
b) for a three-phase meter, making three measurements at 0,05 In at unity power factor, after each of which the connection to the current circuits and to the voltage circuits are changed over 120° while the phase sequence is not altered. The greatest difference between each of the errors so determined and their average value is the value of the variation of error.AS 62053.22 pdf free download.
