GB/T 29318-2024 PDF English
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| GB/T 29318-2024 | English | 380 |
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Electric energy metering for off-board charger of electric vehicle
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| GB/T 29318-2012 | English | 85 |
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GB/T 29318-2024: Electric energy metering for off-board charger of electric vehicle---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT29318-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.200
CCS K 81
Replacing GB/T 29318-2012
Electric Energy Metering for Off-board Charger of Electric
Vehicle
Issued on. SEPTEMBER 29, 2024
Implemented on. APRIL 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms, Definitions and Symbols... 5
4 Technical Requirements... 7
4.1 Metering Interface... 7
4.2 Functions... 7
4.3 Requirements for Complete Machine... 11
4.4 Requirements for metering module... 13
5 Test Methods... 13
5.1 Reference Conditions of Test... 13
5.2 Metering Interface and Nameplate Inspection... 14
5.3 Function Inspection... 14
5.4 Accuracy Test... 14
5.5 Pulse Constant Test... 18
5.6 Error Variation Test... 18
5.7 Clock Time Error Test... 18
5.8 Climate and Environmental Impact Test... 19
6 Inspection Rules... 19
6.1 Inspection Classification... 19
6.2 Inspection Items... 19
6.3 Qualification Determination... 20
Appendix A (informative) Schematic Diagram of Calibration Method... 21
A.1 Real Load Calibration Method... 21
A.2 Virtual Load Calibration Method... 21
Appendix B (normative) Inspection Items... 23
1 Scope
This document stipulates the technical requirements, test methods and inspection rules for the
DC electric energy metering part between the off-board charger of electric vehicles and electric
vehicles.
This document is applicable to the design, manufacturing, acceptance and use of the complete-
machine electric energy metering part of public off-board charger (hereinafter referred to as the
“charger”). Other types of chargers may take this document as a reference.
2 Normative References
The content of the following documents constitutes indispensable clauses of this document
through normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 2423.1 Environmental Testing for Electric and Electronic Products - Part 2.Test Methods
- Tests A. Cold
GB/T 2423.2 Environmental Testing for Electric and Electronic Products - Part 2.Test Methods
- Tests B. Dry Heat
GB/T 2423.4 Environmental Testing for Electric and Electronic Products - Part 2.Test Method
- Test Db. Damp Heat, Cyclic (12 h + 12 h cycle)
GB/T 18487.1-2023 Electric Vehicle Conductive Charging System - Part 1.General
Requirements
GB/T 18487.2-2017 Electric Vehicle Conductive Charging System - Part 2.EMC Requirements
for Off-board Electric Vehicle Supply Equipment
GB/T 29317 Terminology of Electric Vehicle Charging / Battery Swap Infrastructure
3 Terms, Definitions and Symbols
The terms and definitions defined in GB/T 29317, and the following are applicable to this
document.
3.1 public off-board charger
An off-board charger used to provide public services and carry out electric energy transactions.
3.2 total charging energy
The total charging energy recorded by the charger from the first charge when it is in working
condition.
3.3 rate amount
The amount of electric energy output by the charger during the corresponding period of time
when it is, in working condition, multiplied by the rate.
3.4 additional amount
Charges in addition to the rate amount recorded when the charger is in working condition.
NOTE. for example, parking fees, etc.
3.5 billable amount
The sum of the rate amount and the additional amount recorded when the charger is in working
condition, which is used for settlement with the user.
4 Technical Requirements
4.1 Metering Interface
The charger’s interface for electric energy metering satisfies the following requirements.
4.2 Functions
4.2.1 Metering function
The charger has the following functions.
4.2.2 Billing function
The charger shall have the function of calculating the billable amount based on time, electric
energy and rate, etc.
4.2.3 Rate period setting function
The charger has the following functions.
4.2.4 Time adjustment function
The charger shall have a time adjustment function. In addition, it is prohibited to adjust the time
during the charging process.
4.2.5 Information recording function
4.2.6 Clear function
The charger has the following functions.
4.2.7 Display function
4.2.7.1 Basic requirements
The charger shall have a display function that allows display on the machine body or other
carriers.
4.2.7.2 Display digits and resolution
The display digits and resolution of the charger satisfy the following requirements.
4.2.7.3 Charging display
4.2.8 Charging receipt function
The charging receipt function of the charger satisfies the following requirements.
4.2.9 Consistency requirements
If the charger has multiple human-machine interaction modes, all information related to
metering and billing shall be consistent at the end of charging.
4.2.10 Software protection function
4.2.10.1 Prevention of mis-operation
The charger shall have a software protection function that minimizes the possibility of mis-
operation.
4.2.11 Other functions
During the charging process, if the charger cannot normally perform billing, the current
charging, metering and billing shall be immediately stopped, and the metering and billing value
shall be stored; after the above-mentioned functions are restored, metering and billing shall be re-started.
4.3 Requirements for Complete Machine
4.3.1 Connection point location
The connection point location of the charger satisfies the following requirements.
4.3.2 Nameplate
The charger shall have a nameplate, and the nameplate identification shall include the following
meter-related information. If there are multiple charging interface outputs, the maximum
current and minimum current of each channel shall be marked. If each channel is not separately
marked, it is the same by default.
4.3.3 Measurement range
The measurement range of the charger shall comply with the following requirements.
4.3.4 Accuracy requirements
4.3.5 Pulse constant
The relation between the number of electric energy pulses output by the charger test and the
change in electric energy indicated by the display shall be consistent with the pulse constant
marked on the nameplate.
4.3.6 Error variation
At the same test point of the charger, the absolute value of the maximum error change between
adjacent test results shall not exceed 1/5 of the maximum allowable error shown in Table 1 and Table 2.
4.3.7 Clock time error
For chargers with time-sharing billing function, the clock time error of the chargers shall not exceed 5 seconds.
4.4 Requirements for metering module
The shell of the metering module shall be able to be sealed. Only after the seal is broken is it
possible to access the internal components of the module. For the metering module, which is
an electric energy meter plus a supporting sensor device, the electric energy meter and sensor
device shall be respectively and independently sealed.
5 Test Methods
5.1 Reference Conditions of Test
In order to verify the accuracy, the test conditions comply with the following requirements.
5.2 Metering Interface and Nameplate Inspection
During the test, visually inspect the metering interface and nameplate identification of the charger.
Check whether the test results comply with the provisions of 4.1 and 4.3.2.
5.3 Function Inspection
During the test, the charger needs to be powered on. Check various functions through visual
inspection, simulated charging and software copying, etc.
5.4 Accuracy Test
5.4.1 General requirements
Under the test reference conditions specified in Table 4, compare the electric energy values
simultaneously determined by the calibration device and the charger under test, so as to
determine the basic error of the charger under test.
5.4.2 Basic error test under reference voltage
During the test, the charger applies the reference conditions specified in Table 4 other than
current. The current test points shall include the minimum current and maximum current
marked on the charger nameplate. Adopt the method specified in 5.4.1 to test the basic error of
the charger.
5.4.3 Basic error test under reference current
During the test, the charger applies the reference conditions specified in Table 4 other than
voltage. The voltage test points shall include the minimum voltage and maximum voltage
marked on the charger nameplate. Adopt the method specified in 5.4.1 to test the basic error of
the charger.
Check whether the test results comply with the provisions of 4.3.4.2.
5.4.4 Self-heating effect test
During the test, set the charger to operate at the rated power and maximum output current, and
immediately carry out the test on the error of electric energy metering. Then, at an interval of
no more than 1 s, accurately draw the error change curve as a function of time. This test is
conducted for at least 0.5 h, and in any case, the percentage error of the accuracy within 20 min
does not change by more than 0.2% (Level-1 and Level-2). Calculate the change value before
and after the error stabilizes.
5.4.5 Electromagnetic compatibility test
During the test, under the test reference conditions specified in Table 4, select (Umin + Umax)/2,
0.5Imax load point to test the basic error. Then, in accordance with the requirements of 7.2 in
GB/T 18487.2-2017, conduct tests on the external power frequency magnetic field, radio
frequency electromagnetic field radiation, conducted disturbance induced by radio frequency
field, and electrical fast transient pulse. During each test, the basic error is tested at the same
load point.
5.5 Pulse Constant Test
During the test, under the test reference conditions specified in Table 4, record the electric
energy value displayed by the charger and the output pulse number of the test output within a
time interval. The error ek is determined by Formula (6).
5.6 Error Variation Test
During the test, under the test reference conditions specified in Table 4, the charger is tested
repeatedly 3 times at the same test point. Calculate the maximum absolute value of the
difference between adjacent test results.
5.8 Climate and Environmental Impact Test
During the test, under the test reference conditions specified in Table 4, the charger is
respectively subjected to high-temperature test, low-temperature test, alternating heat and
humidity test. The test methods are as follows.
6 Inspection Rules
6.1 Inspection Classification
The product inspection categories include exit-factory inspection, type inspection and
acceptance inspection.
6.2 Inspection Items
6.2.1 Exit-factory inspection
The manufacturer shall test the newly produced chargers in accordance with the inspection
items specified in Table B.1 of Appendix B. After the chargers pass the inspection, the
manufacturer shall issue an inspection certificate.
6.2.2 Type inspection
Type inspection shall be carried out by a testing institution with relevant qualifications. Tests
shall be carried out in accordance with the inspection items specified in Table B.1.When one
of the following circumstances occurs, type inspection of the chargers shall be performed.
6.2.3 Acceptance inspection
The acceptance inspection shall be covered by the clients themselves or entrusted to a testing
institution with relevant qualifications. In addition, the inspection shall be carried out in
accordance with the following procedures.
6.3 Qualification Determination
Only when all test items corresponding to the inspection category of the products under test
comply with the requirements can the category be determined as qualified, otherwise, it shall
be determined as disqualified.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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