Parameter Comment Setting
6002 Generator nominal power 480
6003 Generator nominal current 500
6004 Generator nominal voltage 690
6041 HV measurement transformer primary side (There is none here) 690
6042 HV measurement transformer secondary side (There is none here) 690
6043 Current transformer primary side 500
6044 Current transformer secondary side 1
6051 LV (BB) measurement transformer primary side (There is none here) 400
6052 LV (BB) measurement transformer secondary side (There is none here) 400
6053 Nominal LV setting of step-up transformer 400
9141 Phase angle compensation -30 °
6.45 Demand of peak currents
6.45.1 I thermal demand
This measurement is used to simulate a bimetallic system, known from the Maximum Demand ammeter, which is specifically suited
for indication of thermal loads in conjunction with cables, transformers, and so on.
It is possible to have two different readouts shown in the display. The first readout is called I thermal demand. This readout shows
the average maximum peak current over an adjustable time interval.
INFO
Be aware that the calculated average is NOT the same as the average current over time. The I thermal demand value is an
average of the MAXIMUM PEAK current in the adjustable time interval.
The measured peak currents are sampled once every second, and every 6 seconds an average peak value is calculated. If the peak
value is higher than the previous maximum peak value, it is used to calculate a new average. The thermal demand period will
provide an exponential thermal characteristic.
The time interval in which the average maximum peak current is calculated can be adjusted in parameter 6840. The value can also
be reset. If the value is reset, it will be logged in the event log and the readout in the display is reset to 0.
6.45.2 I max. demand
The second readout is called I maximum demand, and shortened in the controller, I max. demand. The readout displays the newest
maximum peak current value. When a new maximum peak current is detected, the value is saved in the display. The value can be
reset in menu 6843. If the value is reset, it will be logged in the event log.
INFO
The two reset functions are also available as commands through M-Logic (Output, Command, Reset I max demand and
Reset I thermal demand).
INFO
Display readout is updated with an interval of 6 seconds.
6.46 AC average
This function is intended for giving an alarm if the average of a specific measurement exceeds a set point in a certain time frame.
DESIGNER'S HANDBOOK 4189341275A EN Page 177 of 196
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