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Technical
Section 11
Dimensions
Section 12
8
Power Meter functions
Electronic Micrologic 5E
Functions and
characteristics
In addition to protection functions,
Micrologic 5 offers all the functions of
Power Meter products as well as operating
assistance for the circuit breaker:
n
Display of settings
n
Measurement functions:
- Energy (E)
n
Alarms
n
Time stamped histories and event tables
n
Maintenance indicator
n
Communication
Micrologic E measurement functions are made possible by Micrologic intelligence
and the accuracy of the sensors. They are handled by a microprocessor that operates
independent of protection functions.
Display
Micrologic LCD
The user can display all the protection settings and the main measurements on the
LCD screen of the trip unit.
b
b
Instantaneous rms current measurements
b
b
Micrologic E voltage, frequency and power measurements and energy metering
To make the display available under all conditions and increase operating comfort, an
external power supply is recommended.
It is indispensable to:
b
b
Display faults and interrupted current measurements
b
b
Use all the functions of Micrologic E (e.g. metering of low power and energy values)
b
b
Ensure operation of the communication system
The external power supply can be shared by several devices.
FDM121 display unit
An FDM121 switchboard display unit can be connected to a Micrologic trip unit using
a prefabricated cord to display all measurements on a screen. The result is a veritable
96 x 96 mm Power Meter.
In addition to the information displayed on the Micrologic LCD, the FDM121 screen
shows demand, power quality and maximeter/minimeter values along with alarms,
histories and maintenance indicators.
The FMD121 display unit requires a 24 V DC power supply. The Micrologic trip unit is
supplied by the same power supply via the cord connecting it to the FDM121.
PC screen
When the Micrologic, with or without an FDM121 switchboard display unit, is
connected to a communication network, all information can be accessed via a PC.
Measurements
Instantaneous rms measurements
The Micrologic E continuously display the RMS value of the highest current of the
three phases and neutral (Imax). The navigation buttons can be used to scroll
through the main measurements.
In the event of a fault trip, the current interrupted is memorised.
Measures phase, neutral, ground fault currents plus voltage, frequency and power
measurements
Maximeters / minimeters
Every instantaneous measurement provided by Micrologic E can be associated with a
maximeter/minimeter. The maximeters for the highest current of the 3 phases and
neutral, the demand current and power can be reset via the trip unit keypad, the
FDM121 display unit or the communication system.
Energy metering
The Micrologic E also measures the energy consumed since the last reset of the
meter. The active energy meter can be reset via the keypad and the FDM121 display
unit or the communication system.
Demand and maximum demand values
Micrologic E also calculates demand current and power values. These calculations
can be made using a block or sliding interval that can be set from 5 to 60 minutes in
steps of 1 minute. The window can be synchronised with a signal sent via the
communication system. Whatever the calculation method, the calculated values can
be recovered on a PC via Modbus communication.
Ordinary spreadsheet software can be used to provide trend curves and forecasts
based on this data. They will provide a basis for load shedding and reconnection
operations used to adjust consumption to the subscribed power.
Power quality
Micrologic E calculates power quality indicators taking into account the presence of
harmonics up to the 15th order, including the total harmonic distortion (THD) of
current and voltage.
Alarms
Services
ESC
OK
MainMenu
QuickView
Metering
I1
I
%
310 A I2
%
315 A
I3
%
302 A IN
%
23 A
ESC
ESC
U
1
U
2
U
3
V
4/7
402V
100 120
%
398V
100 120
%
401V
100 120
%
ESC
P
64 kW
Q
38 kVar
S
51 kVA
PQS
ESC
Ep
14397 kWh
Eq
8325 kVarh
Es
13035 kVAh
E