ACE6000 User Guide
54
7.13.1.
Magnetic field detection
The meter can be optionally factory-equipped with a sensor that detects external magnetic fields. This type of
field is typically applied to the meter in an attempt (a magnetic attack) to defraud the utility company by disturbing
the measurement metrology sensors.
Note:
The magnetic field of optical heads used for reading the meter are
not
detected by the sensor.
If the magnetic detection feature is fitted, it can be enabled or disabled on-site using the meter support tool.
Operation
When the sensor detects a magnetic field:
a non-fatal, trapped alarm is raised once a programmable threshold duration period has passed
Note:
The alarm type is self-healing in earlier versions of meter firmware.
all serial communications via the RS232 or RS485 ports is suspended
immediately
This occurs even if the magnetic detection feature is disabled or a communication session was in progress.
For the duration of the magnetic attack:
the meter increments
specific
energy registers once every second. These registers:
accumulate their respective energy type
are
only
reset when they reach maximum value (not at EOB)
do
not
have their values stored in any historical buffer registers at EOB
all other registers continue to operate normally
At the end of the magnetic attack:
a time stamped magnetic attack event is stored in the meter logbook
all serial communication functions are restored
any alarm-based SMS messages are sent
depending on the meter firmware version, the alarm disappears when the sensor no longer detects the
magnetic field
There are two modes of operation available for incrementing the affected registers:
Imax method
During the magnetic attack, energy is calculated using the meter
Imax
value instead of the actual measured
current. If this mode is chosen, then only the
Import Active Aggregate Energy
register is incremented.
Note:
Direct and transformer connection meter types use slightly different algorithms for this calculation.
Multiplicative coefficient method
During the magnetic attack, energy is calculated using a programmable
Multiplicative Coefficient
instead of the
actual measured current.
If this mode is chosen, up to six of the following aggregate energy registers can be selected:
Import active or reactive
Export active or reactive
Active or reactive Q1, Q2, Q3, Q4
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