AS 62053.21:2018 pdf free
AS 62053.21:2018 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 for class 1 and 1 h for class 2, without any current in the current circuits, the maximum current shall be applied to the current circuits. 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 0,2 %.
When the meter is under the reference conditions given in 8.5, the percentage errors shall not exceed the limits for the relevant accuracy class given in Tables 6 and 7.
If the meter is designed for the measurement of energy in both directions, the values in Table 6 and Table 7 shall apply for each direction.
The difference between the percentage error when the meter is carrying a single-phase load and a balanced polyphase load at basic current b and unity power factor for direct connected meters, respectively at rated current /n and unity power factor for transformer operated meters, shall not exceed 1,5 % and 2,5 % for meters of classes 1 and 2 respectively.
NOTE When testing for compliance with Table 7, the test current should be applied to each measuring element in sequence.
The additional percentage error due to the change of influence quantities with respect to reference conditions, as given in 8.5, shall not exceed the limits for the relevant accuracy class given in Table 8.
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).AS 62053.21 pdf free download.
