AS 62053.24:2018 pdf free.Electricity metering equipment (ac)- Particular requirements Part 24: Static meters for reactive energy at fundamental frequency (classes 0.5S, 1 S and 1).
7.3 Influence of short-time overcurrents
Short-time overcurrents shall not damage the meter. The meter shall perform correctly when back to its initial working condition and the variation of error shall not exceed the values shown in Table 3.
The test circuit shall be practically non-inductive and the test shall be performed for polyphase meters phase-by-phase.
After the application of the short-time overcurrent with the voltage maintained at the terminals, the meter shall be allowed to return to the initial temperature with the voltage circuit(s) energized (about 1 h).
a) Meter for direct connection
The meter shall be able to carry a short-time overcurrent of 30 ‘max (r.m.s.) with a relative tolerance of +0 % to —10 % for one half-cycle of a sinusoidal waveforms starting at zero volt, at rated frequency.
b) Meter for connection through current transformer
The meter shall be able to carry for 0,5 s a sinusoidal current at rated frequency equal to 20 ‘max with a relative tolerance of +0 % to —10 %.
This requirement does not apply to meters having a switch in the current circuits. For this case, see appropriate standards.
8.3.2 Tests of the influence of DC and even harmonics in the current circuit This test applies only for direct connected meters.
The tests of the influence of DC and even harmonics in the current circuit shall be made with the circuit shown in Figure A.1 or with other equipment able to generate the required waveforms, and the current wave-forms as shown in Figure A.2.
The variation in percentage error when the meter is subjected to the test wave-form given in Figure A.2 and when it is subjected to the reference wave-form shall not exceed the limits of variation given in Table 8.
The values given in Figure A.2 are for 50 Hz only. For other frequencies the values have to be adapted accordingly.
8.3.3 Continuous magnetic induction of external origin
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 62053.24  pdf download.