The meter can be optionally equipped with a 4
th
sensor (CT or DC
version). With this 4
th
sensor, the meter is able to raise an alarm when the
sum (I1+I2+I3) is different from Ineutral. (RMS values). When the alarm is
raised, the meter:
Fraud history is updated with following information :
o Date and time stamp
o Type of event (Current diversion either appearance or
disappearance)
o Urms 1, 2 & 3 (V) from secondary
o Irms 1, 2 & 3 (A) from secondary
o Power factor 1, 2 & 3
o Quadrant information (Q1, Q2, Q3 or Q4)
o Total import active aggregate energy (KWh+)
LCD backlight blinks
6.12.1. Magnetic field detection
The meter is 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.
Operation
When the sensor detects a magnetic field:
a non-fatal, trapped alarm is raised
Note: The alarm type is self-healing in earlier plateforms of SL7K.
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.
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