IM3G-VX
Doc. N° MO-0068-ING
Rev.
1
Pag.
6
of
36
Copyright 2010 - Microener
2.3 - Algorithms of the different functions
2.3.1 - Setting range of the reference input quantities :
- System frequency
:
Fn
= (50-60)Hz
- Rated primary current of phase C.Ts.
:
In
= (0-9999)A, step 1A
- Rated secondary phase-to-phase voltage of P.Ts. :
Uns
= (100-125)V, step 1V
-
Relay basic current (Generator’s rated current)
:
Ib
= (0.5-1.1)In, step 0.1In
2.3.2 - F49 - Thermal overload
The relay computes a thermal image of the machine based on the ratio I/[Ib] of the RMS of the
current flowing in each phase to the rated full load current of the generator :
- Warming-up time constant :
Tc
= (2 - 400)m, step 1m
- Maximum continuous overload :
Ic
= 1.05Ib (
110%Tn)
- Rated full load (I=Ib) temperature rise :
Tn
- Overtemperature prealarm level :
Ta
= (50-110)% Tn, step 1%
-
Current corresponding to machine’s temperature before the overload :
Ip
(
Tp)
- Time to warm-up from Tp to trip temperature (110%Tn) in function of the current overload
2
2
2
2
(Ib/[Ib])
(I/[Ib])
(Ip/[Ib])
(I/[Ib])
[Tc]ln
(Tb/Tn)
(Tx/Tn)
(Tp/Tn)
(Tx/Tn)
[Tc]ln
t
(see curves TU0325 §20)
Cooling is computed with the same time constant (Tc) as heating.
Содержание IM3G-VX
Страница 29: ...IM3G VX Doc N MO 0068 ING Rev 1 Pag 29 of 36 Copyright 2010 Microener 19 TIME CURRENT CURVES F51 TU0311 Rev 0...
Страница 30: ...IM3G VX Doc N MO 0068 ING Rev 1 Pag 30 of 36 Copyright 2010 Microener 20 I2 t CONSTANT ELEMENT F46 TU0312 Rev 0...
Страница 31: ...IM3G VX Doc N MO 0068 ING Rev 1 Pag 31 of 36 Copyright 2010 Microener 21 THERMAL IMAGE CURVES TU0325 Rev 0...
