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GB/T 29318-2024 PDF English


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GB/T 29318-2024English380 Add to Cart 0-9 seconds. Auto-delivery. Electric energy metering for off-board charger of electric vehicle Valid
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GB/T 29318-2024: PDF in English (GBT 29318-2024)

GB/T 29318-2024 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 Electric Energy Metering for Off-board Charger of Electric Vehicle 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 within 24 hours, and the minimum interval between the time periods is 15 minutes. b) Rates that match the time periods can be set. 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 4.2.5.1 Metering and billing information The charger has the following functions: a) It should be able to record the total charging energy and total billable amount; b) It shall be able to record the charging records. A charging record at least includes: charging order information, charging energy, billable amount, each rated used in charging, start and end time of charging, charging energy of each rate, billable amount of each rate, and other additional amounts; c) At least the latest 1,000 times of the metering and billing information shall be saved. 4.2.5.2 Event records The charger shall have the following functions: a) Record the total number of programming times of the metering module and the time and programming items of the last 10 programming times; b) Record the total number of clears, the time of the last 10 clears, and the data before clearing; c) Record the total number of time adjustments and the time before and after the last 10 time adjustments; d) Record the total number of times that the metering module shell is opened, and the occurrence and termination times of the last 10 openings of the metering module shell. 4.2.6 Clear function The charger has the following functions: a) Metering and billing information and event records other than 4.2.5.2 b) can be cleared through programming in the debugging state; b) Prohibited setting of metering and billing information and events. c) Clear events shall be permanently recorded. 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: a) The display unit of the electric energy shall be kW  h, with no less than 6 display digits, at least 3 decimal places, and a resolution of no more than 0.001 kW  h; b) The display unit of the billable amount shall be yuan, with no less than 6 display digits, at least 2 decimal places, and a resolution of no more than 0.01 yuan; c) The display resolution of the current clock time shall not be greater than 1 s. 4.2.7.3 Charging display 4.2.7.3.1 Charging start display The charging start display of the charger satisfies the following requirements. a) The last charging termination display shall be automatically cleared before the current charging operation. b) If there are multiple billing modes to choose from, before starting charging, there shall be a clear interface for users to choose from. If there is only one billing mode, there shall be a clear interface to inform users of the billing mode, rate and rate period. 4.2.7.3.2 Charging process display The charging process display of the charger satisfies the following requirements: a) During the charging process, the current billing mode, real-time charging energy, real- time billable amount and current time shall be able to be displayed; b) The current rate, charging energy of the current rate, billable amount of the current rate and current rate period should be displayed; c) If the machine displays, the refresh time interval of the displayed data shall not be greater than 1 s. 4.2.7.3.3 Charging termination display 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: a) When the connection point of the charger is at the vehicle connection, the location of connection shall comply with the requirements of 3.1.5.3 and 3.1.5.4 in GB/T 18487.1-2023; b) When the connection point of the charger is at the charger connection, the location of connection shall comply with the requirements of 3.1.5.5 in GB/T 18487.1-2023; c) If the charger has multiple connection points, each connection point shall be individually meter-able. 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. a) Metering standard, on which, the product is based. b) Maximum voltage, minimum voltage, minimum current and maximum current. c) Electric energy constant of the charger; d) Accuracy level. 4.3.3 Measurement range The measurement range of the charger shall comply with the following requirements: a) The voltage measurement range covers the charger output voltage range; b) The current measurement range covers the minimum current and maximum current marked on the nameplate. 4.3.4 Accuracy requirements 4.3.4.1 Basic error limit at reference voltage When the charger applies the reference conditions other than current, its basic error in electric energy metering shall not exceed the requirements of Table 1. For chargers with bidirectional Tn---the selected measurement time, expressed in (s); P---the set constant power value, expressed in (W). Use the automatic method to control the standard timer, the charger under test continuously operates, and the determination time is not less than 10 s. If the power pulse sequence sent by the calibrator or standard power source is not uniform enough or its response speed is relatively slow, the determination time needs to be appropriately increased. During the calibration process, record the error determination data at least twice, and take the average value to calculate the basic error. 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. Check whether the test results comply with the provisions of 4.3.4.1. 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. Check whether the test results comply with the provisions of 4.3.4.3. 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 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. a) High-temperature test: put the charger into the environmental test chamber and follow the requirements of “Test Bb: high-temperature test for temperature gradient of non- heat dissipation test samples” of GB/T 2423.2. The test temperature complies with the upper limit of normal operating temperature specified in 15.1.1 of GB/T 18487.1- 2023. After the test temperature of the environmental test chamber stabilizes, the charger is set to operate under the rated load state to measure the electric energy metering error, which shall comply with the requirements of Table 1 and Table 2. b) Low-temperature test: put the charger into the environmental test chamber and follow the requirements of “Test Ab: low-temperature test for temperature gradient of non- heat dissipation test samples” of GB/T 2423.1. The test temperature complies with the lower limit of normal operating temperature specified in 15.1.1 of GB/T 18487.1- 2023. After the test temperature of the environmental test chamber stabilizes, the charger is set to operate under the rated load state to measure the electric energy metering error, which shall comply with the requirements of Table 1 and Table 2. c) Alternating heat and humidity test: put the charger into the environmental test chamber and follow the requirements of “Test Db: alternating heat and humidity (12 h + 12 h cycle)” of GB/T 2423.4. The test temperature is 40 C and the number of cycles is 2 times. After the test is completed, under the reference conditions, measure the electric energy metering error, which shall comply with the requirements of Table 1 and Table 2. 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 ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.