Flags are categorized based on their priority and type:

Orange Flag (IEC Flag)

  • Indicates an IEC-related event (e.g., dip, swell, or interruption is active)

Red Flag

  • Indicates abnormal conditions such as frequency out of range

♦ Frequency Out of Range Flag

This flag is raised when the operating frequency exceeds the allowed limits:

  • 40–60 Hz (for 50 Hz systems)
  • 50–70 Hz (for 60 Hz systems)

When this condition occurs:

  • All readings become zero
  • Any active event is closed
  • All aggregation intervals are flagged
  • The following parameters are reset:
    • Frequency (10 s)
    • Power Demand
    • Energy
    • Mains Signaling

 Readings remain zero until valid measurements are restored.


♦ Disconnection Flag

This flag indicates that the measurement is unreliable due to disconnection conditions.It may occur when:

  • The device operates in floating mode
  • Current clamps are disconnected
  • Noise is detected instead of a valid signal

Thresholds:

Voltage Disconnection In = 1 V

Voltage Disconnection Out = 5 V

Current Disconnection In = 0.05 A

Current Disconnection Out = 0.4 A


 Hysteresis is applied to prevent oscillation between connected and disconnected states.


♦ Disconnection Scenarios

The following table shows different disconnection cases and the affected parameters:

Type Of Disconnection

Flagged Parameter



Disconnection on all Voltage Line

- Frequency             

- Frequency10Sec

- Voltage unbalance  

- Power Factors         

- Harmonics Current

- Crest Factor   .

- Current Peaks 

- Current unbalance

- THD 

- K factors 

- Current RMS


Disconnection on all Current Line

- Current Unbalance 

- Current Crest Factor

- K factor

- Current THD 


Disconnection on single voltage line

-Voltage THD 

-Voltage Crest Factor 


Disconnection on Single Current Line

-K factor 

-current Crest Factor

-current THD 


Disconnection on V_Lx and its current I_Lx


-Power Factors


IEC- Flag

When an IEC-related event occurs (such as dip, swell, or interruption):

  • All related readings are flagged
  • Aggregation intervals are also flagged
  • The affected data is marked according to IEC standards

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