GB/T 15284-2022Multi-rate electricity meters - Particular requirements (English PDF)

6.1 Functional requirements

6.1.1 Basic functions Unless otherwise specified, under normal operating conditions, the design of the meter shall meet the following requirements: - The clock has calendar, timing, leap year automatic conversion function; - It has the function of time being calibrated; - The date and time are set with security measures to prevent operations by unauthorized persons; - If the power outage time misses the freezing time, it has a supplementary freezing mechanism when the power is turned on; - It supports the setting of rates and time intervals for holidays and special days; - It records the date of the last 10 programming and the total number of programming; - It records the tiered electricity for different electricity price tiers.

6.1.2 Local meter functions Unless otherwise specified, under normal operating conditions, local meters shall be designed to meet the following requirements: - At least 14 time intervals can be set arbitrarily within 24h (minimum interval is 5min). Time interval can be set across zero; - At least 4 rate registers are supported. Each register records power data at a specified time corresponding to different rates; - Store at least the last two months or the last two billing cycles of total electricity and electricity data of each rate. It can be read out through the data communication interface. The data storage boundary time is the end of the month or other (1st to 28th) designated days; - Record the total electricity and the number of times each rate register is cleared and the data before clearing; - It can process the rate parameter form or other electricity price contract parameters remotely issued by the master station. Locally realize rate management and electricity price contract update.

6.2.4 Seal regulations It shall comply with the provisions of

5.4 in GB/T 17215.211-2021.

6.2.5 Display of measured values It shall comply with the provisions of

5.5 in GB/T 17215.211-2021. For local meters, the indicating display shall show the current effective rate. The measured value indication of each rate register shall be read locally, and each rate register clearly identified. For remote meters, the indicating display shall support the display of electricity data recorded at predetermined time intervals.

6.2.6 Storage of measured values It shall comply with the provisions of

5.6 in GB/T 17215.211-2021.

6.2.7 Output It shall comply with the provisions of 5.7.1, 5.7.2.1, 5.7.2.2,

5.7.3.1 in GB/T 17215.211- 2021.

6.2.8 Electrical pulse input It shall comply with the provisions of

5.8.1 in GB/T 17215.211-2021.

6.2.9 Work indicator It shall comply with the provisions of

5.9 in GB/T 17215.211-2021.

6.2 Mechanical and structural requirements...

6.2.13 Instrument temperature limits and heat resistance

6.2.13.1 Surface temperature limits to prevent burns When the ambient temperature is 40°C, the temperature of the easy-to-contact surface of the meter shall not exceed the value given in 1) in Table 31 of IEC 62052-31:2015 under normal conditions. When the ambient temperature exceeds 40°C, the temperature of the easy-to-contact surface of the meter is allowed to exceed the value given in 1) in Table 31 of IEC 62052- 31:2015. However, the excess value is not greater than the difference between the ambient temperature and 40°C. The surface of the terminal box covered by the terminal cover, or the surface of the board-mounted instrument protected by the fence, is not regarded as an accessible surface.

6.2.13.2 Temperature limits for terminals When the ambient temperature is 40°C, the temperature of the terminal shall not exceed the value given in Table 32 of IEC 62052-31:2015 under normal conditions. When the ambient temperature exceeds 40°C, the temperature of the terminal is allowed to exceed the value given in Table 32 of IEC 62052-31:2015. However, the excess value is not greater than the difference between the ambient temperature and 40°C.

6.3 Climatic conditions It shall comply with the provisions of 8.1,

8.3 in Chapter 8 of GB/T 17215.211- 2021.

6.4 External effect It shall comply with the provisions of 9.1, 9.2,

9.4.1 in Chapter 9 of GB/T 17215.211-2021.

6.5 Metrological performance protection requirements It shall comply with the provisions of Chapter 10 of GB/T 17215.211-2021.

6.6 Electrical requirements

6.6.1 Clearance and creepage distances meter shall not exhibit flashover, destructive discharge or breakdown. After the test, the meter shall be free from mechanical damage and work correctly. NOTE: Unom is the nominal voltage between line and neutral.

6.6.3.1 Pulse voltage Apply the pulse voltage specified in

6.10.2.3 of IEC 62052-31:2015. The meter shall not exhibit flashover, destructive discharge or breakdown. After the test, the meter shall be free from mechanical damage and work correctly.

6.6.3.2 AC power frequency voltage Apply the AC power frequency voltage specified in

6.10.2.5 of IEC 62052-31:2015. The meter shall not exhibit flashover, destructive discharge or breakdown. After the test, the meter shall be free from mechanical damage and work correctly.

6.6.4 Voltage interruption effects

6.6.4.1 Effect of voltage interruption on the meter 6.6.4.1.1 Voltage interruption effects of local meters During the period when the power supply voltage interruption does not exceed the working reserve, when the power supply is restored, the meter shall correctly store the data (if any) at the end of the month or the specified day. 6.6.4.1.2 Voltage interruption effects of remote meters During the period when the power supply voltage interruption does not exceed the working reserve, when the power supply is restored, the meter shall be able to refreeze the data of the next freezing point at the time of power-off and the data of the previous freezing point at the time of power-on.

6.6.4.2 Effect of voltage interruption on clock During the period when the power supply voltage interruption does not exceed the working reserve, the meter clock shall maintain the specified accuracy when power is restored. When power is restored to the meter, the meter's clock and calendar shall not be confused.

6.7 Metrological performance requirements

6.7.1 Meter constants The relationship between the test output and the indicated value of the indicating display shall conform to the constant value of the meter.

6.7.2 No-load condition (creeping) Current circuit opens. Voltage circuit applies 1.1Unom voltage. Within the specified test time limit, the test output of the meter shall not generate more than one pulse.

6.7.3 Startup The meter shall startup at the startup current of Ist (polyphase meter with balanced load) specified in relevant standards such as GB/T 17215.321-2021, GB/T 17215.323-2008, GB/T 17215.324-2017 and when the power factor (or sinphi) is 1. Continuously record electricity.

6.7.4 Basic maximum allowable error (initial inherent error) It shall comply with the provisions of

7.6 in GB/T 17215.321-2021,

8.1 in GB/T 17215.323-2008 and

8.2 in GB/T 17215.324-2017.

6.7.5 Repeatability The same measured signal under the same measurement conditions shall produce nearly consistent continuous measurement results.

6.7.6 Variation requirements The absolute value of the maximum error change between adjacent test results shall comply with the provisions of GB/T 17215.321-2021 for the meters of various accuracy levels.

6.7.7 Load current rise and fall The basic error of the meter is tested twice in the order of load current from small to large, and then from large to small. The absolute value of the error change of the same sample at the same load point shall comply with the provisions of GB/T 17215.321- 2021.

6.7.8 Error consistency The deviation between the test error of the meter under test and the average value of the error at the same test point shall comply with the provisions of GB/T 17215.321- 2021 for the meters of various accuracy levels.

6.7.9 Electricity indication error Only a single rate register (other than the total register) is valid for a local meter at any time. The sum of the recorded values in each multi-rate register shall equal the recorded value of the total register. It is not appropriate to calculate the recorded value of the total register by arithmetically adding the recorded value of each rate register. If the The surface temperature limit of the meter to prevent burns and the temperature limit test of the meter terminals shall be carried out in accordance with the provisions of

10.4 in IEC 62052-31:2015.

7.2.2 Output test The functional test of the optical test output shall be carried out in accordance with the provisions of

7.6 Electrical test

7.6.1 Power consumption test The power consumption shall be under the reference conditions given in

7.1 of GB/T 17215.211-2021. The reference voltage and reference current shall be applied to the voltage loop and the electricity meter. Turn the meter backlight off. Measure active and apparent power consumption of voltage lines. Apply reference voltage and reference current to the current loop and electricity meter. Turn the meter backlight off. Measure the apparent power consumption of each current line.

7.6.2 Measurement of clearance and creepage distances It shall be carried out in accordance with the provisions of

6.2 in GB/T 16935.1-2008.

7.6.3 Electrical test procedures The electrical test procedures related to safety shall be carried out in accordance with the provisions of

11.2 in GB/T 17215.321-2021.

7.6.4 Withstand long-term overvoltage test Carry out in accordance with the provisions of

6.10.3.2 in IEC 62052-31:2015.

7.6.5 Dielectric strength test

7.6.5.1 Humidity pretreatment It shall be carried out in accordance with

6.10.4.2 of IEC 62052-31:2015.

7.6.5.2 Test method and test equipment preparation The dielectric strength test shall be carried out in accordance with the provisions of 6.10.4.3.1 in IEC 62052-31:2015. The test equipment preparation shall meet the requirements of 6.10.4.3.2 in IEC 62052-31:2015.

7.6.5.3 Impulse voltage test It shall be carried out in accordance with the provisions of 6.10.4.3.3 in IEC 62052- 31:2015. The test voltage meets the requirements of Table 7 in IEC 62052-31:2015.

7.6.5.4 AC power frequency voltage test It shall be carried out in accordance with the provisions of 6.10.4.3.4 in IEC 62052- 31:2015. The test voltage meets the requirements of Table 11 in IEC 62052-31:2015.