NB/T 33008.1-2018 English PDF (NB/T33008.1-2018)

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NB/T 33008.1-2018: Inspection and test specifications for electric vehicle charging equipment. Part 1: Off-board charger
NB/T 33008.1-2018
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.200
K 81
Filing number: 68878-2018
Replacing NB/T 33008.1-2013
Inspection and test specifications for electric vehicle
charging equipment - Part 1: Off-board charger
ISSUED ON: DECEMBER 25, 2018
IMPLEMENTED ON: MAY 01, 2019
Issued by: National Energy Administration
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 8 
4 Inspection rules ... 8 
5 Test methods ... 12 
Appendix A (Informative) Battery simulation test device ... 50 
Inspection and test specifications for electric vehicle
charging equipment - Part 1: Off-board charger
1 Scope
This part specifies the inspection rules and test methods for the off-board
charger of electric vehicle (hereinafter referred to as chargers).
This part applies to the type test, exit-factory inspection, arrival acceptance of
the charger.
This part applies to the charger as specified in NB/T 33001-2018.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 2421.1-2008 Environmental testing for electric and electronic
products - General and guidance
GB/T 2423.1-2008 Environmental testing for electric and electronic and
electronic products - Part 2: Test methods - Tests A: Cold
GB/T 2423.2-2008 Environmental testing for electric and electronic products
- Part 2: Test methods - Tests B: Dry heat
GB/T 2423.4-2008 Environmental testing for electric and electronic products
- Part 2: Test method - Test Db: Damp heat, cyclic (12h + 12h cycle)
GB/T 2423.17-2008 Environmental testing for electric and electronic
products - Part 2: Test method - Test Ka: Salt mist
GB/T 2423.55-2006 Environmental testing for electric and electronic
products - Part 2: Test methods - Test Eh: hammer tests
GB/T 4208 Degrees of protection provided by enclosure (IP code)
GB 4824-2013 Industrial, scientific and medical equipment - Radio-
frequency disturbance characteristics - Limits and methods of measurement
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 20234.1-2015 Connection set for conductive charging of electric
vehicles - Part 1: General requirements
GB/T 20234.3-2015 Connection set for conductive charging of electric
vehicles - Part 3: DC charging coupler
GB/T 27930-2015 Communication protocols between off-board conductive
charger and battery management system for electric vehicle
GB/T 29317 Terminology of electric vehicle charging/battery swap
infrastructure
GB/T 29318 Electric energy metering for electric vehicle off-board charger
GB/T 34657.1-2017 Interoperability test specifications of electric vehicle
conductive charging - Part 1: Supply equipment
GB/T 34658-2017 Conformance test for communication protocols between
off-board conductive charger and battery management system for electric
vehicle
NB/T 33001-2018 Specification for electric vehicle off-board conductive
charger
IEC 61851-23 Electric vehicle conductive charging system - Part 23: Electric
vehicle charging station (2nd edition, committee draft, CD)
3 Terms and definitions
The terms and definitions as defined in GB/T 18487.1-2015, GB/T 18487.2-
2017, GB/T 29317, NB/T 33001-2018 apply to this document.
4 Inspection rules
4.1 Classification of inspections
Product inspection is divided into three types: type test, exit-factory inspection,
arrival inspection.
4.1.1 Type test
The product must be type tested under the following conditions:
peak value.
5.1.4 Requirements for test instrument
Unless otherwise specified, the instruments used in the test shall meet the
following requirements:
a) The measuring instruments and meters used shall pass the metrological
verification or calibration; the certificate shall be valid;
b) The measuring range of measuring instruments and meters shall cover
the measuring range being measured;
c) The measurement uncertainty of the test instrument, meter or system shall
be better than 1/3 of the allowable error being measured;
d) The measured value shall be more than 1/5 of the range of the selected
instrument and meter.
5.1.5 Current sensor
The current can be measured using the ammeter direct measurement method
or the secondary measurement method via a current sensor. The sensor can
be a shunt or a Hall sensor. The sensor shall meet the following requirements:
a) When using a current sensor, it shall ensure that the environmental
conditions meet the requirements for use; take isolation and protection
measures when necessary;
b) It shall select the current sensor with suitable range.
5.1.6 Test load
It is recommended to use a resistive load or a battery simulation device with a
function to simulate battery voltage and load. See Appendix A.
5.2 General inspection
5.2.1 Visual inspection
Visually check that the housing of the charger (including the charging
connection device) shall be flat, without obvious defects such as bumps,
scratches, deformation, etc.; the surface coating and plating shall be uniform
and not fall off; the parts (including the internal contacts of the connection
device) shall be fastened and reliable, without such defects and damages as
rust, burr, crack.
5.2.2 Marking inspection
Inspect the outdoor chargers, which shall have anti-theft measures, such as
anti-theft locks and anti-theft screws. Meanwhile there shall be relevant
requirements in the product installation instructions.
5.3 Functional test
5.3.1 Test of charge control function
Follow the steps below to perform a charge control function test:
a) Connect the charger to the test system, to check the charger, which shall
be able to dynamically adjust the charging output based on the data
provided by the vehicle battery management system’s simulation software,
perform corresponding actions according to the set parameters, to control
the charging process and complete the charging automatically.
b) When the charger with manual charging control function is being
debugged or maintained without being connected to a higher-level
monitoring system or operation management system and the vehicle,
check that the charger shall manually set the charging parameters in the
manner declared by the manufacturer, implement charging start-stop
operation, to complete the charging process.
5.3.2 Communication function test
For chargers that have the communication function with the higher-level
monitoring system or operation management system as specified by the
manufacturer, connect the test system. During the charging process, check that
the charger shall be able to communicate according to the agreed protocol
requirements.
5.3.3 Test of insulation testing function
Connect the charger to the test system and perform the test according to the
following steps:
a) Before the insulation test, the absolute value of the voltage outside the
simulation K1 and K2 is greater than 10 V, check that the charger shall
stop the insulation test process and issue an alarm prompt;
b) Check that the charger end is provided with an insulation detection circuit,
meanwhile after the vehicle interface is connected and before the vehicle’s
charging circuit contactors K5 and K6 are closed, the charger shall be able
to close the DC output circuit’s contactors K1 and K2, to perform insulation
testing of its interior (including the charging cable). The insulation test
voltage shall meet the requirements of B.3.3 in GB/T 18487.1-2015;
c) Simulate insulation failure and insulation abnormality according to the
detection process), the charger's electronic lock shall be reliably locked; it
shall neither be unlocked with power on, nor be unlocked manually.
c) When the simulating the failure to continue charging and the completion
of charging, the voltage of the vehicle interface shall be reduced below
60V DC when the electronic lock is released.
d) The electronic lock device shall have an emergency unlocking function.
5.3.6 Test of pre-charge function
Connect the charger to the test system. During the charging configuration
phase, before K5 and K6 are closed, simulate the normal vehicle-side battery
voltage (the error range between the K1 and K2 outside voltage and the voltage
of communication message battery is ≤ ±5% and it is in the normal output
voltage of the charger). Close K5 and K6; check that the charger shall adjust
the output voltage inside K1 and K2 to the current battery voltage minus 1 V ~
10 V after detecting the normal vehicle-side battery voltage; then close K1 and
K2.
5.3.7 Test of display function
Connect the charger to the test system to simulate standby status, charging
status, fault or alarm status, etc., check that the display information or status of
the charger shall comply with the provisions of 6.7.1 in NB/T 33001-2018;
meanwhile the display characters are clear and complete, without defects.
Chargers with manual charging control functions shall be able to display manual
input information.
5.3.8 Test of input function
For the charger with manual input and control functions, connect the test system;
set the charger’s charging parameters; check that the charger shall correctly
enter the charging process and perform the setting operation. During the
charging process, simulate the start-stop operation and check that the charger
shall start or stop charging properly.
5.3.9 Test of measurement function
For chargers equipped with electric energy meters, the energy measurement
function of the chargers shall meet the requirements of GB/T 29318.
5.3.10 Test of emergency stop function
Follow these steps to test:
a) Check that the charger shall be equipped with an emergency stop device
Connect the charger to the test system and set it to run under the rated load.
Use methods such as filter clogging, cooling fan failure, or other failure methods,
to simulate the internal temperature of the charger exceeding the over-
temperature protection value. Check the charger that shall reduce the output
power or cut off DC output and alarm alert.
5.4.6 Test of door-open protection
Connect the charger with a maintenance door that can cause the live parts to
be exposed when the door is opened to the test system, to carry out test
according to the following steps:
a) Before charging, open the charger’s door and check the charger, it shall
not be able to start charging;
b) During the charging process of the integrated charger, the simulation door
is opened, the charger shall cut off the power supply input and DC output
at the same time;
c) During the charging process of the split type charger, the simulation door
is opened, the charger shall cut off the power input or output of the
corresponding part.
5.4.7 Test of starting emergency stop device
Connect the charger to the test system and set it to run under the rated load.
Start the emergency stop device. The charger shall disconnect K1 and K2 within
100 ms, meanwhile the vehicle’s interface voltage shall not exceed 60VDC
when the electronic lock is unlocked.
5.4.8 Test of input current overshoot
Connect the charger to the test system and set it to run under the rated load.
When the charger enters the charging phase and starts to output, use a
measuring instrument to record the peak input current of the charger; check
that the peak current of the charger shall not exceed 110% of the rated input
current .
5.4.9 Reverse connection test of battery
Connect the charger to the test system. Before the configuration phase of
charging parameter, simulate reversing the power battery and the charger’s
anode and cathode. Close K5 and K6. The charger shall allow to charge and
issue an alarm.
5.4.10 Test of anti-backflow function
The main circuit (chart) of the charger or the configured power conversion unit
gauge or Vernier caliper. Meanwhile it must have a grounding sign.
b) Doors, covers, shroud plate and similar parts of chargers shall be
connected to the charger’s main frame by protective conductors. The
cross-sectional area of the protective conductors measured by a gauge or
Vernier shall not be less than 2.5 mm2.
c) When measured by electric bridge, grounding resistance tester or digital
low resistance tester, the resistance between any point that shall be
grounded and the total ground in the charger shall not be greater than 0.1
Ω; the number of measurement points shall not be less than 3. If anti-
corrosion paint is coated at the measurement point, it requires removing
the anti-corrosion paint to expose the non-insulating material to carry out
test. The grounding terminal shall have obvious signs.
d) Check that the internal working grounding and protective grounding of the
charger shall be independent of each other. They shall be directly
connected to the grounding conductor (copper bar), respectively. Multiple
grounding electrical devices shall not be connected in series in one
grounding wire.
5.12 Charging output test
5.12.1 Selection of test points
The charging output test of the charger without constant power charging
function and with constant power charging function shall be tested at the test
points given in Table 4 and Table 5, respectively (this test point refers to the
combination of input voltage, output voltage, output current points ). The
reference diagram of test point is as shown in Figure 3. According to the
charging strategy specified in the manufacturer's declaration or product
specification, it may add other test points during the test.
For a multi-charger with a charging module multiplexing method, only the
vehicle interface with the ma...