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6.2 Simplicity and versatility
Keyboard programming is extremely easy and allows setting of:
•
Connection type (star and delta)
•
Low Tension or Medium Tension
•
Setting of CTs and VTs values (freely settable)
•
Integration time (1-99 min.)
•
RS485 features (speed, parity and data format)
•
Alarm threshold for the Active Power.
•
Analog
output.
•
Pulses
•
...and all other functions available
The sameFunctions can be programmed via PC
6.3 Total harmonic distortion Measurement (THD)
The instrument gives an evaluation of the energy quality by sampling the total harmonic distortion of the 3
voltages and 3 currents.
These functions are extremely useful to control the quality of the energy supplied by the Public Utility,
because of the large number of distorting loads in industrial plants.
6.4 Energy
Measurement
Energy is displayed on a 6 digit display with floating point.
The energy counters are stored on counters with minimum definition equal to 0,1 Wh and maximum
counting equal to 99.999.999,9 kWh.
8 counters are available +Ea, -Ea, ++Er, -+Er, +-Er, --Er, +Es, -Es on 4 total quadrants and for each one
of the 8 tariff ranger
6.5 Storage
The instrument stores the following data according to user programmable services
•
Load curves. It stores on files, according to a pre-defined schedule, the content of one or more
than one ModuBus registers (input registers and/or holding registers)
•
System log. It includes the instrument history from the start with all the functioning altering
operations.
•
Configuration log. It records the configuration modifications
•
Event log. It records the following events on file:
o
Power
failure
Power voltage loss (power down).
Power voltage return (power up).
o
Interruption
Loss of one or more phase voltage (phase-neutral or phase-phase if star
connected) below a programmable threshold value (voltage loss).
Return of one or more phase voltage above of a programmable threshold value
(voltage return)
o
Over
current
Overshoot of one or more line currents of the programmable threshold value
(over current).
Instrument
reset
•
RMS value maximum and minimum (1 Sec)
•
Definition of the calendar ranges: it includes the tariff structure.
•
Tariff counters: It includes the following energy coEa, -Ea, ++Er, -+Er, +-Er, --Er, +Es, -Es
for the 4 quadrants and for each of the 8 tariff options.
•
Peak values: contains the maximum - or peak - power values (averaged over the integration
period) on 4 quadrants or each of the 8 tariff options
