JJG 1148-2022AC Charge Spots for Electric Vehicles(for Trial Implementation) (English PDF)

3.1 AC charge spot

A special device that uses conduction method to provide AC power for electric vehicles with on-board charging equipment, it has the functions of measuring and storing AC power and providing results to users.

3.2 connection point

A connection point that the AC charge spot is connected to electric vehicle.

NOTE: If the output cable is a fixed part of the AC charge spot, this point is defined as the connector at the end of the cable. Otherwise, the connection point is defined as the cable insertion point of the

AC charge spot.

3.3 real load test method

A method of verification using the actual operating load.

3.4 virtual load test method

A method that uses the virtual load provided by the AC charge spot verification device for verification.

3.5 operate error

AC power measurement error of AC charge spot under working conditions.

3.6 test output

A device that provides pulses corresponding to the AC power measured by the AC charge spot.

3.7 constant

A numerical value representing the relationship between the electric energy recorded by the AC charge spot and the corresponding test output value.

3.8 nominal voltage

The output voltage of the AC charge spot specified by the manufacturer during normal operation.

6.2 Testing interface

The technical indicators of the test output and communication interface of the charge spot for verification shall meet the requirements of relevant standards.

6.3 Constant

The charge spot shall have a pulse output corresponding to the measured AC power, which shall be consistent with the constant marked on the nameplate.

6.4 Minimum power variable

The minimum electric energy variable shall be 0.001kW·h.

6.5 Display of charging energy

The charge spot shall be able to display the charging energy. The number of digits displayed for electric energy shall not be less than 6 (including at least 3 decimal places).

For charge spots with time-of-use billing function, the clock time display resolution is not greater than 1s.

7.1 First verification, follow-up verification and in-use inspection

The first verification is a verification of charge spots that have not been verified. The follow-up verification is any verification after the first verification. Repaired charge spots must be verified as the first verification. In-use inspection is an inspection to find out whether the verification mark or verification certificate of the charge spot is valid, and whether the verified charge spot has been significantly modified.

7.2 Verification conditions

7.2.1 Ambient conditions for verification

When verifying the charge spot, the following conditions shall be met:

- Verification conditions and their deviations do not exceed those specified in Table

3.

- There shall be no appreciable shock load. The seal of the charge spot is complete.

the electric energy values measured simultaneously by the verification device and the charge spot under verification, so as to determine the operate error of the charge spot under verification.

Method I:

When both the charge spot calibrator and the charge spot under verification are working continuously, use the pulse output by the charge spot under verification to control the counting of the calibrator to determine the operate error of the charge spot under verification. When using this method, apply method II to check whether the charge spot constant is correct.

The operate error gamma of the verified charge spot is calculated according to (1).

Where, m - the measured pulse number;

m0 - the calculated and determined pulse number, calculated according to formula (2).

Where,

N - the number of pulses of the verified charge spot;

C0 - the constant of calibrator, imp/ (kW·h);

CL - the constant of the verified charge spot, imp/ (kW·h).

NOTE: Select the appropriate pulse number N of the charge spot under verification, so that the quantification error of the calculation and determination of the number of pulses is not greater than 1/10 of the grade index of the charge spot under verification.

Method II:

When both the charge spot calibrator and the charge spot under verification are working continuously, use the output electric energy indication value of the verified charge spot and the measured electric energy value of the charge spot calibrator to determine the operate error of the verified charge spot.

The operate error gamma of the verified charge spot is calculated according to (3):

Where,

E' - the difference between the indicated value of the electric energy when the charge spot under verification stops charging and when charging starts, kW·h;

E - the energy value measured by the calibrator, kW·h;

gamma0 - the established systematic error of the verification device; when no correction is required, gamma0=0.

The calibrator shall run synchronously with the charge spot under verification. The ratio (%) of the electric energy value represented by the last word (or the minimum scale value) of the display of the charge spot under verification to the accumulated E' shall not be greater than 1/5 of the grade index of the charge spot under verification.

During the verification process, record the error measurement data at least twice.

Take the average value to calculate the operate error.

2) Virtual load test method

Use a verification device. Compare the electric energy values measured simultaneously by the verification device and the charge spot under verification, so as to determine the error of the charge spot under verification. When using the virtual load test method, the influence of the connection position on the test results shall be considered.

The standard table method is used to test the charge spot according to the provisions of 1).

Use watt-second method to verify the charge spot. Use a calibrator to measure the set constant power or use a standard power source to determine the power. The quantification error of the number of digits displayed by the calibrator or power source shall not be greater than 1/10 of the grade index of the charge spot under verification. At the same time, use a standard timer to measure the time required for the charge spot to output several pulses at a constant power. The actual electric energy is obtained by the product of this time and the constant power. Compare with the electric energy measured by the charge spot to determine the operate error of the charge spot.

The operate error is calculated according to formula (4):

7.4 Processing of verification results

7.4.1 Processing of verification results

7.4.1.1 Judging all data shall be subject to the rounded data.

7.4.1.2 The rounding interval of operate error is 1/10 of the accuracy level of the charge spot.

7.4.1.3 The rounding interval of the clock time error is 1s.

7.4.2 Rounding off method for measurement data

7.4.2.1 Rounding off method when the rounding off interval is 1: For the number 1 of the reserved digit on the right side of the reserved digit, if it is greater than 0.5, add 1 to the reserved digit. If it is less than 0.5, the reserved bit remains unchanged. If it is equal to 0.5, the reserved bit remains unchanged when it is an even number. Add 1 when the reserved bit is odd.

NOTE: "Reserved bit" refers to the number corresponding to the rounding interval. This value is called a "reserved bit".

7.4.2.2 Rounding method when the rounding interval is n (n!=1): Divide the measured data by n. Then round off according to the method of 7.4.2.1. After rounding, multiply by n, which is the final rounding result.

7.4.3 If all items meet the requirements, it is judged as qualified, otherwise it is judged as unqualified. Charge spots that pass the verification will be issued a verification certificate (see Annexes B and C for the format of the verification certificate) and a verification mark.

7.4.4 A certified charge spot must be sealed at the position of the electric energy meter or metering module used inside it.

7.4.5 A test result notification will be issued to the unqualified charge spot (see Annexes

B and C for the format). Cancel the original certification seal or certification mark.

7.5 Verification period

The verification period of the charge spot is generally not more than 3 years. The verification period can be adjusted appropriately according to JJF 1139 and the regulations of the metrology administrative department. For charge spots that have metering performance online monitoring conditions or anti-cheating functions, and have implemented data transmission, the verification period can be appropriately extended upon approval of the metering administrative department.

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