IS 14451 : Part 2 : 1999 Telemetering for Consumption and Demands - Part 2 : Direct Digital Transfer of Meter Values

1 Scope

1.1 This standard applies to telemetering apparatus intended tooperate in conjunction with a.c. static electrical energy meters,in particular for billing and statistical purposes.

1.2 This standard covers telemetering apparatus consisting of:

i) A Master Unit with built in communication interface whichreceives actual meter values from one or more Slave Units. Theinformation received is either displayed, stored, recorded ormathematically processed (for example in Summation Units) by theMaster Unit.

ii) One or more Slave Units which are essentially a.c. staticelectrical energy meters with built in Communication Interface,which respond to the commands received from the Master Unit bytransmitting actual meter values.

1.3 This standard is applicable regardless of the distancebetween the Master and Slave Units of the telemetering system.

1.4 This standard does not apply to:

i) Telemetering systems transmitting information in an analogform, for example by means of a voltage or current proportional tothe measured electrical parameters from the Slave Unit(s).

ii) Telemetering systems employing exclusively impulsingdevices.

Note - Such systems have been covered by Part 1 of thisstandard.

iii) Meter Reading Instruments (MRI), which are portable devicesused for collection, temporary storage and transfer of data.

1.5 This standard does not cover the channels or media ofcommunication between the Master and Slave Units, such as wiredmedia, telephone lines, radio, optical fibres, microwave, etc;since these channels and media should comply to the appropriatedocuments/standards.

1.6 Data conversion or modulation devices, if employed, shall becovered by this standard if they form an integral part of thetelemetering system.

2 References

IS 1401 :1970Accessibility test probes

IS 2071 : Part 1 :1993High voltage test techniques :Part 1 General definitions and testrequirements

IS 4905 :1968Methods for random sampling

IS 6842 :1977Limits for electromagnetic interference

IS 9000 : Part 5 : Sec 1 :1981 Basic environmental testing proceduresfor electronic and electrical items :Part 5 Damp heat(cyclic) test,Section 1

IS 11731 : Part 1 :1986Methods of test for determination offlammability of solid electricalinsulating material. When exposed to anigniting source :Part 1 Horizontal specimen method

IS 13010 :1990ac Watt-hour meters, class 0.5, 1 and 2

IS12032Graphical symbol for diagrams in thefield of electrotechnology

IS 12346 :1988Testing equipment for ac electricalenergy meter

IS 12360 :1988Voltage bands for electricalinstallations including preferredvoltages and frequency

IS 13779 :1993 ac Static watt-hour meters class 1 and 2