AS 62054.21:2018 pdf free
AS 62054.21:2018 pdf free.Electricity metering (AC) – Tariff and load control
On a day dial, it shall be possible to set the time with an accuracy better than±7 ,5 min.It shall be possible to programme the switching operations with a resolution of 15 min or smaller and it shall be possible to programme a minimum of two successive switching operations at least within 60 min.
On a week dial, it shall be possible to set the day of the week and the time with an accuracy better than 1 h. It shall be possible to programme the switching operations with a resolution of 2 h or smaller and it shall be possible to programme a minimum of 2 successive switching operations at least within 8 h.
On a year dial, it shall be possible to set the date and time with an accuracy better than 2 days. It shall be possible to programme the switching operations with a resolution of 4 days or smaller and it shall be possible to programme a minimum of 2 successive switching operations at least within 16 days.
Place the time switch under test in its normal operating position and, if necessary, in a climatic chamber, and supply it from an apparatus free of voltage dips and short interruptions. Unless otherwise indicated, the reference conditions shown in Annex B of IEC 62052-21 shall be maintained.
NOTE The manufacturer should provide a suitable means for testing the time-keeping accuracy. This could be, for example, an electrical or optical output, or, in the case of capacitor calibrated crystal-controlled time switches, an electromagnetic coupling picking up the signal from the crystal could be used.
The time switch under test is supplied together with and synchronised to a reference mains-controlled clock. After a testing period of 30 days, the time indication discrepancy between the reference clock and the time switch under test must be less than±5 s.AS 62054.21 pdf free download.
