AS 1284.9-1993

1 - AS 1284.9-1993 ELECTRICITY METERING - ELECTRONIC WATTHOUR METERS (CLASSES 0.2 S AND 0.5 S)
4 - PREFACE
10 - 1 Scope
10 - 2 Normative references
12 - 3 Definitions
12 - 3.1 General definitions
12 - 3.1.1 watt-hour meter:
12 - 3.1.2 static watt-hour meter:
12 - 3.1.3 multi-rate meter:
12 - 3.1.4 meter type:
13 - 3.1.5 reference meter:
13 - 3.2 Definitions related to the functional elements
13 - 3.2.1 measuring element:
13 - 3.2.2 Output devices
13 - 3.2.3 memory:
13 - 3.2.4 display:
13 - 3.2.5 register:
13 - 3.2.6 current circuit:
13 - 3.2.7 voltage circuit:
13 - 3.2.8 auxiliary circuit:
13 - 3.2.9 constant:
14 - 3.3 Definitions of mechanical elements
14 - 3.3.1 indoor meter:
14 - 3.3.2 base:
14 - 3.3.3 cover:
14 - 3.3.4 case:
14 - 3.3.5 accessible conductive part:
14 - 3.3.6 protective earth terminal :
14 - 3.3.7 terminal block:
14 - 3.3.8 terminal cover:
14 - 3.3.9 clearance:
14 - 3.3.10 creepage distance:
14 - 3.4 Definitions of insulations
14 - 3.4.1 basic insulation:
14 - 3.4.2 supplementary insulation:
15 - 3.4.3 double insulation:
15 - 3.4.4 reinforced insulation:
15 - 3.5 Definitions of meter quantities
15 - 3.5.1 rated current*
15 - 3.5.2 maximum current
15 - 3.5.3 reference voltage *
15 - 3.5.4 reference frequency:
15 - 3.5.5 class index:
15 - 3.5.6 percentage error:
15 - 3.6 Definitions of influence quantities
15 - 3.6.1 Influence quantity:
15 - 3.6.2 reference conditions:
16 - 3.6.3 variation of error due to an influence quantity:
16 - 3.6.4 distortion factor:
16 - 3.6.5 electromagnetic disturbance:
16 - 3.6.6 reference temperature:
16 - 3.6.7 rated operating conditions:
16 - 3.6.8 specified measuring range:
16 - 3.6.9 specified operating range:
16 - 3.6.10 limit range of operation:
16 - 3.6.11 storage and transport conditions:
16 - 3.6.12 normal working position:
16 - 3.6.13 thermal stability:
16 - 3.7 Definition of tests
16 - 3.7.1 type test:
17 - 4 Requirements
17 - 4.1 Standard electrical values
17 - 4.1.1 Standard reference voltages
17 - 4.1.2 Standard rated currents
17 - 4.1.3 Standard reference frequencies
17 - 4.2 Mechanical requirements
17 - 4.2.1 General mechanical requirements
18 - 4.2.2 Case
18 - 4.2.3 Window
18 - 4.2.4 Terminals – Terminal block(s) – Protective earth terminal
19 - 4.2.5 Terminal cover(s)
19 - 4.2.6 Clearance and creepage distances
20 - 4.2.7 Resistance to heat and fire
20 - 4.2.8 Protection against penetration of dust and water
20 - 4.2.9 Display of measured values
21 - 4.2.10 Output devices
21 - 4.2.11 Marking of meter
22 - 4.3 Climatic conditions
22 - 4.3.1 Temperature range
23 - 4.3.2 Relative humidity
23 - 4.4 Electrical requirements
23 - 4.4.1 Power consumption
24 - 4.4.2 Influence of supply voltage
24 - 4.4.3 Influence of short-time overcurrents
24 - 4.4.4 Influence of self-heating
25 - 4.4.5 Influence of heating
25 - 4.4.6 Insulation
25 - 4.5 Electromagnetic compatibility (EMC)
25 - 4.5.1 Immunity to electromagnetic disturbance
25 - 4.5.2 Radio interference suppression
25 - 4.6 Accuracy requirements
25 - 4.6.1 Limits of error due to variation of the current
26 - 4.6.2 Limits of error due to other influence quantities (voltage variation, frequency variation, waveform, phase sequence
28 - 4.6.3 Limits of error due to ambient temperature variation
28 - 4.6.4 Starting and running with no-load
28 - 4.6.5 Meter constant
29 - 5 Tests and test conditions
29 - 5.1 General testing procedures
29 - 5.1.1 Test conditions
29 - 5.1.2 Type test
29 - 5.2 Tests of mechanical requirements
29 - 5.2.1 Spring hammer test
29 - 5.2.2 Shock test
30 - 5.2.3 Vibration test
30 - 5.2.4 Test of resistance to heat and fire
30 - 5.2.5 Test of protection against penetration of dust and water
31 - 5.3 Tests of climatic influences
31 - 5.3.1 Dry heat test
31 - 5.3.2 Cold test
31 - 5.3.3 Damp heat cyclic test
32 - 5.4 Tests of electrical requirements
32 - 5.4.1 Test of power consumption
32 - 5.4.2 Tests of influence of supply voltage
32 - 5.4.3 Test of influence of short-time overcurrents
33 - 5.4.4 Test of influence of self-heating
33 - 5.4.5 Test of influence of heating
33 - 5.4.6 Tests of insulation properties
35 - 5.5 Tests for electromagnetic compatibility (EMC)
35 - 5.5.1 General test conditions
36 - 5.5.2 Test of immunity to electrostatic discharges
36 - 5.5.3 Test of immunity to electromagnetic HF fields
37 - 5.5.4 Fast transient burst test
37 - 5.5.5 Radio interference measurement
37 - 5.6 Tests of accuracy requirements
37 - 5.6.1 General test conditions
38 - 5.6.2 Test of influence quantities
39 - 5.6.3 Test of ambient temperature influence
39 - 5.6.4 Test of no-load condition
39 - 5.6.5 Test of staffing condition
39 - 5.6.6 Test of meter constant
39 - 5.6.7 Interpretation of test results
40 - Annex A - Relationship between ambient air temperature and relative humidity
41 - Annex B - Voltage wave-form for the tests of the effect of voltage dips and short interruptions
42 - Annex C - Electromagnet for testing the influence of externally-produced magnetic fields
43 - Annex D - Test schedule

Specifies requirements for electronic watthour meters of accuracy classes 0.2 S and 0.5 S suitable for installation indoors. This Standard is technically identical with and reproduced from IEC 687:1992.

This International Standard applies only to newly manufactured static watt-hour meters of accuracy classes 0,2 S and 0,5 S, for the measurement of alternating-current electrical active energy of a frequency in the range 45 Hz to 65 Hz and to their type tests only.It applies only to transformer-operated static meters for indoor application consisting of one or more measuring elements and registers enclosed together in the same case.NOTE - IEC 185 describes transformers having a measuring range of 0,05In to 1,2In, or of 0,05In to 1,5In,or of 0,05In to 2In and transformers having a measuring range of 0,01In to 1,2In for accuracy classes 0,2 Sand 0,5 S. As the measuring ranges of a meter and its associated transformers have to be matched and as only transformers of classes 0,2 S and 0,5 S have the accuracy required to operate the meters of this standard, the measuring range of the meter will be 0,01In to 1,2In.It also applies to operationindicators, test outputs and meters which measure energy in both directions.This standard does not apply to:a) watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line voltage for meters for polyphase systems);b) portable meters and meters for outdoor use;c) data interfaces to the register of the meter;d) reference meters.Where the display and/or the memory(ies) is/are external or where other elements are enclosed in the meter case (such as maximum demand indicators, telemetering, time switches or remote control, etc.) this standard applies only to the metering section.This standard does not cover the acceptance tests and the conformity tests (both testing procedures are connected with legal requirements of the different countries and could only be taken care of partially).For rack-mounted meters, the mechanical properties are not covered in this standard.

First published as AS 1284.9-1993.