MICROENER IM30-GLF, Operation Manual

Page: 7 / 31

IM30-GLF
Doc. N° MO-0062-ING
Rev. 3
Date 14.02.2005
Copyright 2010 - Microener Firmware: 2.0X Pag 7 of 31
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 primary current of ground C:T. :
On = (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 - F50/51 - Dual level 3-phase overcurrent
F1 - 50/51 : Low set overcurrent

Pick-up (operation) level
Setting I>
= Dis blocks function’s operation
: I> = (1-2.5)Ib, step 0.01Ib

Drop-out ratio :

0.95

Minimum operation time of instantaneous output : 30ms

Trip time delay in the definite time operation mode F(I>) = D : t = tI> = (0.05-30)s, step 0.01s

Trip time delay in the inverse time operation mode F(I>) = SI
1 ) (I/I
tI 0.033
t
0.02
 
 

(tI> = trip time delay at I/I> = 5)
(see curves TU0311 Attachment. B)
F2 50/51 : High set overcurrent

Pick-up (operation) level
Setting I>>
= Dis blocks function’s operation
: I>> = (1-12)Ib, step 0.1Ib

Drop-out ratio :

0.95

Minimum operation time of the instantaneous element : 30ms

Independent trip time delay : t =
tI>> = (0.05-3)s, step 0.01s
2.3.3 - F50/51G - Stator Ground Fault

Pick-up (operation) level
Setting O>
= Dis. blocks function’s operation
: O> = (0.02-0.4)On, step 0.01On

Drop-out ratio :

0.95

Minimum operation time of the instantaneous element : 30ms

Independent trips time delay : t = tO> = (0.05-30)s, step 0.01s