Electronic energy meters, especially those with STS payment functions have the ability to give an alarm. Low credit is a typical example. This alarm is indicated by a flashing LED and can come also with an acoustic signal, sometimes also called beep or buzzer.
I’ve got the question: Who is going to pay for this additional power consumption?
What is the additional consumption?
For the LED we consider an average of 0.044 VA (2.2 V * 20 mA). If the whole consumption is active, the consumption is one unit per 5 years for a permanent flashing diode. Together with a permanent beep we have about 2 years per unit.
The beep switches by default off after 3 minutes or when a button on the keypad is pressed. The alarm diode is also only ON as long as the alarm situation exists. So in my humbled opinion it’s less than one unit for the meter lifetime.
Who is charged for the additional consumption?
The power supply for the alarm diode and the buzzer is coming from the internal power supply in the meter. The same power supply also delivers the power for the display and the microcontroller unit (MCU).
By IEC 62052-11 Ed.2 the maximum power consumption in the voltage circuit is specified with 2 W or 10 VA. The actual consumption is at least for CLOU energy meters much lower.
Nevertheless, whatever self-consumption a meter has in the voltage circuit is covered by the utility. It is not deducted from the end-customer credit.
For the utility it’s part of their technical losses for providing power.
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