7.13. Fraud protection measures
The meter incorporates the following features designed to prevent tampering and/or assist in the detection of
attempted fraud:
Anti-fraud measuring mode
The meter may be configured to register energy with an anti-fraud
algorithm.
The meter body and terminal cover may be independently sealed with
conventional wire or plastic seals.
Access to the links requires removal of the sealed terminal cover.
Anti-tamper events, for example:
current reversal or cross-phasing
zero sequence U and I
duration without internal consumption above a threshold
excess current
Recorded as date/time stamped events, which can be read from the
meter.
Recorded as date/time stamped events, which can be read from the
meter.
Indication provided by an annunciator in the LCD.
When any aspect of the meter is programmed, the meter records the
number of objects configured as a date/time stamped event.
Typical fraud-related parameters include:
Calendar reprogramming (seasons, day profiles, index)
CT/VT transformer ratio reprogramming
Indication of meter cover and/or
terminal cover removal
Recorded as date/time stamped events:
start date of cover opening
duration
number of cover opening events
The detection remains active during power failure events (one opening is
counted regardless of how many occurred)
The meter enclosure can be optionally fitted with an effective shielding
against external magnetic fields.
Magnetic attack detection
The meter can be optionally factory-equipped with a magnetic field
detector. This can be configured to:
record the number of magnetic events
record the time/date and duration of the last 10 magnetic events
generate a non-fatal alarm and light an annunciator in the LCD
increment specific energy registers during the magnetic event
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