GB/T 17215.321-2021 English PDF (GB/T17215.321-2021)

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GB/T 17215.321-2021: Electricity metering equipment (AC) - Particular requirements - Part 21: Static meters for active energy(classes A, B, C, D and E)
GB/T 17215.321-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.220.20
N 22
Replacing GB/T 17215.321-2008, GB/T 17215.322-2008
Electricity metering equipment (AC) - Particular
requirements - Part 21: Static meters for active energy
(classes A, B, C, D and E)
ISSUED ON: APRIL 30, 2021
IMPLEMENTED ON: NOVEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4 
Introduction ... 8 
1 Scope ... 10 
2 Normative references ... 12 
3 Terms and definitions... 12 
4 Standard electricity value ... 13 
4.1 Voltage ... 13 
4.2 Current ... 13 
4.3 Frequency ... 13 
4.4 Power consumption ... 14 
5 Structure ... 14 
5.1 General requirements ... 14 
5.2 Mechanical test ... 14 
5.3 Windows ... 14 
5.4 Sealing requirements ... 14 
5.5 Display of measured value ... 14 
5.6 Storage of measured values ... 14 
5.7 Output ... 15 
5.8 Electrical pulse input ... 15 
5.9 Working indicator ... 15 
5.10 Protection against mechanical hazards ... 15 
5.11 Measures to protect the connection ... 15 
5.12 Prevention of flame spreading ... 15 
5.13 Meter temperature limit and heat resistance ... 15 
6 Marking and documentation of the meter ... 16 
7 Metering performance ... 16 
7.1 General test conditions ... 16 
7.2 Methods of accuracy verification ... 16 
7.3 Meter constant test ... 17 
7.4 No-load condition (creeping) test ... 17 
7.5 Starting current test ... 17 
7.6 Basic maximum allowable error ... 17 
7.7 Repeatability test ... 18 
7.8 Variation requirement test ... 18 
7.9 Variation test of load current rise and fall ... 19 
7.10 Error consistency test ... 19 
7.11 Error limit test due to influence quantity ... 19 
7.12 Combined error test of electric energy indication ... 23 
7.13 Timing accuracy test ... 23 
7.14 Combined maximum allowable error test ... 23 
8 Climatic environment ... 23 
9 External influences ... 23 
10 Metering performance protection ... 23 
11 Electrical ... 24 
11.1 Clearance and creepage distances ... 24 
11.2 Electrical test procedure ... 24 
11.3 Tests for voltage circuits ... 25 
11.4 Dielectric strength test ... 25 
11.5 Short-time overcurrent test ... 25 
12 Type test ... 25 
Appendix A (Normative) Safety-related electrical test procedures ... 26 
References ... 27 
Electricity metering equipment (AC) - Particular
requirements - Part 21: Static meters for active energy
(classes A, B, C, D and E)
1 Scope
This Part of GB/T 17215.3 specifies the standard electricity value, structure, meter's
marking and documentation, metering performance, climate environment, external
influence, metering performance protection, electrical requirements, for static meters
for active energy.
This Part of GB/T 17215.3 is only applicable to the newly manufactured static meters
for active energy, which is used to measure the AC active energy, in 50 Hz or 60 Hz
power grid, AND has an accuracy class of A, B, C, D, E. (below referred to as "meter").
It is also applicable to other type tests.
Note 1: For other requirements (such as structure, EMC, reliability), refer to GB/T 17215.211-
2021, as well as the relevant parts of GB/T 17215.911, GB/T 17215.921, GB/T 17215.9311,
GB/T 17215.9321, GB/T 17215.941.
This Part applies to newly manufactured electricity metering equipment, which is used
to meter and control electrical energy in the power grid, that has a voltage not exceeding
600 V. All special functional units, except the electrical energy measuring function, can
be integrated in the meter enclosure, OR can form a separate enclosure.
Note 2: The above voltage is the line-to-neutral line voltage, which is derived from the nominal
voltage, as shown in Table 7 of IEC 62052-31:2015.
If the meter has functions other than metering active energy, for example:
- Measurement of voltage amplitude, current amplitude, power, frequency, power
factor, etc.;
- Measurement of power quality parameters;
- Load control function;
- Data communication interface.
If encapsulated in the meter enclosure, the relevant standards can apply to these
functional requirements. However, the requirements for these functions are not within
the scope of this Part.
Note 3: The requirements for power monitoring devices and measurement functions (such as
voltage amplitude, current amplitude, power, frequency, etc.) have been covered in GB/T
18216.12; BUT equipment, that complies with GB/T 18216.12, is not suitable as a payment
meter, unless they also meet the accuracy class requirements of this Part.
Note 4: The requirements for power quality monitoring meters have been covered in IEC
62586-1. The measurement methods for power quality monitoring functions have been covered
in GB/T 17626.30-2012. The test requirements for power quality monitoring functions are
covered in IEC 62586-2.
The requirements of this Part apply, if the meter is designed to be mounted on a
specified mating (meter) socket or rack. The test is performed, with the meter mounted
on the specified mating socket or rack. However, the requirements for such socket or
rack are outside the scope of this Part.
Note 5: Examples of rack-mounted meters are: rail-mounted meters, panel-mounted meters, etc.
If the meter is designed to install a separated indicator display, the requirements of this
Part apply; meanwhile, the meter can be connected to its separated indicator display for
testing, unless otherwise specified.
If the meter has more than one current circuit per phase (for example: multi-unit meter),
the requirements of this Part apply to all current circuits of any current-measuring unit,
in the meter enclosure.
This Part also applies to auxiliary input and output circuits, operating indicators, test
outputs of electricity metering equipment.
Note 6: For example, pulse input and output, control input and output, power test output.
This Part distinguishes:
- Single-phase meters and multi-phase meters;
- Directly connected meters and meters connected via a transformer;
- Meters with integrated indicating displays and meters with separated indicating
displays;
- Indoor and outdoor meters.
This Part does not apply to:
- The meters, which have a line-to-neutral voltage in excess of 600 V derived from
the nominal voltage;
4.4 Power consumption
Power consumption shall comply with the requirements, test conditions, test procedures,
acceptance criteria, which are specified in 4.4 of GB/T 17215.211-2021.
5 Structure
5.1 General requirements
The general requirements of the structure shall comply with the provisions in 5.1 of
GB/T 17215.211-2021.
5.2 Mechanical test
The mechanical test shall comply with the provisions of 5.2 in GB/T 17215.211-2021.
It shall also comply with the spring hammer test requirements, test conditions, test
procedures, acceptance criteria, which are specified in 8.2 of IEC 62052-31:2015.
5.3 Windows
The window requirements shall comply with the provisions in 5.3 of GB/T 17215.211-
2021.
5.4 Sealing requirements
The requirements for sealing shall comply with the provisions in 5.4 of GB/T
17215.211-2021.
5.5 Display of measured value
The measurement value display requirements shall comply with the provisions of 5.5
in GB/T 17215.211-2021.
5.6 Storage of measured values
The storage requirements of the measured...