MICROELETTRICA MC30-BC, Руководство по эксплуатации

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MC30-BC
Doc. N°
MO-0365-ING
Copyright 2008 FW 980.09.01.X Date 15.06.2022 Rev. 1 Pag. 6 of 37
2.2 - Operation and Algorithms
2.2.1 - Reference Input Values
Display Description Setting Range Step Unit
I1 100 A Rated Primary current of phase C.T. 1 - 9999 1 A
I2 5 A Rated Secondary current of phase C.T. 1 - 5 1/5 A
In 100 A Reference main primary current of the relay 1 - 9999 1 A
StIn 0 H Start time “In” for main current 0 - 23 1 H
InL 1 A Relay second primary current low 1 - 9999 1 A
StInLH 0 H Start time for InL second current 0 - 23 1 H
Freq 50 Hz System rated frequency 50 - 60 10 Hz
TW 60 sec Warming-up time constant for Thermal Image 60 - 3600 1 sec
Ib 105 %In Maximum admissible continuous overload for Thermal Image 50 - 130 0.1 %In
2.2.2 - Input quantities
2.2.2.1 - Mains Frequency (Freq)
The relay can operate either in 50Hz or 60Hz systems.
The rated Mains Frequency “Freq” must be set accordingly.
2.2.2.2 - Phase Current inputs (I1)
The relay directly displays the r.m.s. value of the Phase Currents “ IA ”, “ IB ”, “ IC ” flowing in the Primary of
the input Current Transformers and refers all its measurements to that value.
To make the relay properly working with any C.T., when programming the relay settings, input the value
“I1” of the primary current of the phase C.Ts
The measure is not displayed below : < 5% In
2.2.2.3 – Reference Primary Current
To have a better accuracy [In] case of use of CT with bigger ratio, a further setting is foreseen.
This setting better define the rated current of the feeder regardless of the CT ratio.
To get a double setting range, two values of reference primary current are foreseen:
-
MAIN
-
SECOND
It is possible to switch from main to second setting via digital input or by means of an internal timer ([StIn],
[StInLH]).
2.2.2.4 – Start time “In”
The time is indicated in Hours, every day at this time the relay automatically set the reference primary
current to main.
2.2.2.5 – Start time “IL”
The time is indicated in Hours, every day at this time the relay automatically set the reference primary
current to second.