Reasons for Constant Alarm Light Illumination on Smart Electricity Meters

When the electricity meter triggers an alarm, the smart meter will alert users through LCD display and alarm light illumination. Prompt action is required when the meter enters alarm status. Various faults can cause meter alarms, and below are some common alarm conditions:

1. Battery Fault Alarm: When the meter's clock battery or low-power battery is depleted or has low voltage, a battery symbol will flash on the LCD screen along with the alarm light. Battery 1 alarm indicates clock battery failure - if not replaced promptly, power restoration after outages may cause time disorder affecting metering accuracy, requiring users to report the issue for factory maintenance. Battery 2 alarm signals low-power battery failure, causing event recording chaos after power restoration, necessitating immediate battery replacement.

2. Voltage Loss Alarm: The alarm light flashes when one or multiple phases lose voltage or drop below 70% of rated voltage. Users should first verify their own operations, then check circuit integrity if no operational issues exist.

3. Current Loss Alarm: The alarm light flashes when three-phase voltage exceeds the meter's critical voltage while any one or two phases show current below starting current (or zero current) with other phase load current exceeding 5% of rated current. Users should inspect for meter, current transformer (CT), or circuit faults, replacing faulty components and reorganizing wiring as needed.

4. Voltage Phase Reversal Alarm: When user-side voltage connections reverse the A/B/C phase sequence, the LCD displays "-UA, -UB, -UC" and "Reverse Phase Sequence" with flashing alarm light. Voltage phase reversal occurs when three-phase wiring connections are inverted. Although normal metering continues, immediate correction is crucial to prevent significant impacts. As the grid's user interface, smart meters deliver safe, high-quality power while enabling bidirectional energy flow from distributed renewable sources like wind and solar through grid feedback mechanisms.

5. Current Phase Reversal Alarm: When current wiring reverses the A/B/C phase sequence, the LCD displays "-IA, -IB, IC" and "Reverse Phase Sequence" with flashing alarm light. Reversed phases may cause meter reversal, requiring immediate correction - though severe cases often result in burnout damage.

6. Phase Failure Alarm: The alarm light illuminates when one phase loses power in three-phase systems. Leveraging remote communication capabilities, smart meters allow users to control intelligent loads (AC units, washing machines, refrigerators, lighting) via internet/mobile networks while enabling remote monitoring and alarm functions. Users must inspect circuits to identify failure causes.

7. Voltage/Current Imbalance Alarm: The alarm light flashes during three-phase voltage/current imbalance. Minor fluctuations may be ignored, but significant deviations require circuit and equipment inspection.

8. Overload Alarm: The alarm light activates when user load exceeds meter capacity. Users should reduce load or install current transformers.

9. Overvoltage Alarm: The alarm light illuminates when voltage exceeds 1.15 times rated value. Users must identify and resolve the overvoltage condition until normal range is restored.

10. Power Reverse Alarm: The alarm light activates due to incorrect wiring connections. Users must correct the wiring configuration.

The above details common meter alarm conditions. Has this improved your understanding of constant alarm light illumination on household meters? For more smart meter knowledge, follow Huabang Company's news updates!