IM30-GLF
Doc. N° MO-0062-ING
Rev.
3
Date
14.02.2005
Copyright 2010 - Microener
Firmware:
2.0X
Pag
4
of
31
f
fn
t
t
f
5t
10
50
t
t
10
a. Before removing a module, ensure that you are at the same electrostatic potential
as the equipment by touching the case.
b. Handle the module by its front-plate, frame, or edges of the printed circuit board.
Avoid touching the electronic components, printed circuit tracks or connectors.
c. Do not pass the module to any person without first ensuring that you are both at
the same electrostatic potential. Shaking hands achieves equipotential.
d. Place the module on an antistatic surface, or on a conducting surface which is at
the same potential as yourself.
e. Store or transport the module in a conductive bag.
More information on safe working procedures for all electronic equipment can be found
in BS5783 and IEC 147-OF.
1.10 - Maintenance
Make reference to the instruction manual of the Manufacturer; maintenance must be carried-
out by specially trained people and in strict conformity with the safety regulations.
1.11 - Fault Detection And Repair
Internal calibrations and components should not be altered or replaced.
For repair please ask the Manufacturer or its authorised Dealers.
Misapplication of the above warnings and instruction relieves the Manufacturer of any liability.
2. GENERAL
Input currents are supplied to 4 current transformers: - three measuring phase current - one measuring
the earth fault zero-sequence current. Phase current input can be 1 or 5A
For zero-sequence current, taps for 1A and 5A inpu
t are provided on relay’s terminal board.
Input phase to phase voltage is supplied to one voltage transformer with rated input
programmable 100-125V.
The Time/current Curves, the algorithms and the ratings are herebelow reported.
This relay is derived from the version IM30-G with the addition of the possibility to work with input
frequency in the range from 5 to 70 Hz taking into account the following limitation:
During the transient operation with frequency “f” different from the nominal one “fn” the functions
programmed with dependent inverse time delay will compute a trip time “tf” different than that “t”
corresponding to the operation at the nominal frequency :
Example : the trip time delay at 10Hz will be five times that corresponding to 50Hz
There fore for low-frequency operation the function I> has to be programmed in the
independent definite time mode F(I>)=D (see § 12).
On the contrary the current unbalance element F46 operates properly even at low-frequency because
the heating of the rotor produced by the negative sequence component is by itself inversely proportional
to the frequency.
