Power Consumption: At the reference voltage, reference temperature, and reference frequency, the active power and apparent power of the energy meter's voltage circuit shall be less than 1 W and 6 VA, respectively; at the basic current, reference temperature, and reference frequency, the apparent power of the energy meter's current circuit shall be less than 1 VA.
Voltage and Voltage Influence: Specified operating range: 0.9 Un – 1.1 Un; Limit operating range: 0.7 Un – 1.3 Un. Upon applying a voltage of 380 V to the voltage circuit for one hour, no damage shall occur; following the test, the energy meter shall function normally.
Influence of Power Supply Interruption: Following testing conducted in accordance with prescribed procedures, power supply interruptions shall have no substantial adverse effect on the energy meter.
Influence of Short-Duration Overcurrent: The meter shall be capable of withstanding an overcurrent of 30 Imax without sustaining damage. The duration of application shall be one-half cycle at the rated frequency; following the test, the energy meter shall function normally, and the change in error shall not exceed ±1.5% (at I = Ib, cosφ = 1.0).
Influence of Self-Heating: The change in error caused by self-heating shall not exceed ±1.0% (at I = Imax, cosφ = 1.0) and ±1.5% (at I = Imax, cosφ = 0.5L).
Influence of Temperature Rise: Under normal operating conditions, the insulation shall not attain a temperature that adversely affects the operation of the energy meter. With an ambient temperature not exceeding 40ºC, the temperature rise of the enclosure shall not exceed 25K.
Insulation: Under normal operating conditions, sufficient dielectric integrity shall be maintained. Due consideration must be given to atmospheric influences and the varying voltages encountered during normal operation; the device must be capable of withstanding impulse voltage tests and AC voltage tests as prescribed by relevant regulations.
Electromagnetic Compatibility (EMC): Complies with the requirements of GB/T 17215–1998 and DL/T 614–1997.
Electromagnetic Immunity: The design of the electricity meter shall ensure that it remains undamaged and functionally unaffected when subjected to conducted and radiated electromagnetic disturbances, as well as electrostatic discharges.
Key Component Requirements:
Chipset: Variation ±0.1%, Linearity ±0.2% (Model: ADE7755, USA)
Electrolytic Capacitors: 105ºC rating, 3000-hour lifespan, Leakage current <3μA, Rated voltage ≥16V (Brand: Rubycon, Japan)
Current-limiting Capacitors: Polystyrene metallized film, Capacitance ≥0.33μF (Brand: Philips)
Varistors: 20K series, Nominal voltage 620V ±10%, Leakage current <30μA, Voltage ratio ≤1.15
Sampling Resistors: Manganese-copper alloy (Passivated and subjected to high-temperature aging)
Crystal Oscillators: Imported components or products from joint-venture enterprises
SMD Resistors: Imported components or products from joint-venture enterprises
SMD Capacitors: Imported components or products from joint-venture enterprises
Zener Diodes: Imported components
Light-Emitting Diodes (LEDs): Low power consumption, Imported components