Doc.

N° MO-0011-ING

MICROELETTRICA SCIENTIFICA
MILANO ITALY IM30-T Rev. 2
Pag. 1 of 23

MICROPROCESSOR OVERCURRENT
AND UNBALANCE + EARTH FAULT
PROTECTION RELAY
TYPE IM30-T

OPERATION MANUAL

Copyright 1995 Microelettrica Scientifica

2 MOD. 416 08-05-97

BRASCA
1 MOD. 371 29-07-96 BRASCA
0 EMISSION 11-10-95 BRASCA
REV. DESCRIPTION DATE PREP. APPR.
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Pag. 2 of 23

INDEX
1 General utilization and commissioning directions……………………………………… 3
1.1 Storage and transportation…………………………………………………………….. 3
1.2 Installation…………………………………………………………………………….. 3
1.3 Electrical connection………………………………………………………………….. 3
1.4 Measuring inputs and power supply…………………………………………………... 3
1.5 Outputs loading………………………………………………………………………... 3
1.6 Protection earthing…………………………………………………………………….. 3
1.7 Setting and calibration………………………………………………………………… 3
1.8 Safety protection………………………………………………………………………. 3
1.9 Handling……………………………………………………………………………….. 3
1.10 Maintenance…………………………………………………………………………… 4
1.11 Fault detection and repair……………………………………………………………… 4
2 General characteristics……………………………………………………………………. 4
2.1 Power supply……………………………………………………………………… 4
3 Controls and measurements……………………………………………………………… 5
4 Signalizations………………………………………………………………………………. 6
5 Output relays………………………………………………………………………………. 6
6 Serial communication……………………………………………………………………… 7
7 Digital inputs……………………………………………………………………………….. 7
8 Test………………………………………………………………………………………….. 7
9 Keyboard and display operation………………………………………………………….. 8
10 Reading of measurements and recorded parameters……………………………………. 8
ACT. MEAS (Actual measure)………………………………………………….. 8
MAX VAL (Max. value)………………………………………………………. 9
LASTTRIP (Last trip)…………………………………………………………. 9
TRIP NUM (Trip number)…………………………………………………….. 9
11 Reading of programmed settings and relay’s configuration…………………………….. 10
12 Programming……………………………………………………………………………….. 10
12.1 Programming of functions settings………………………………………………… 10
12.2 Programming the configuration of output relay…………………………………… 12
13 Manual and automatic test operation…………………………………………………….. 13
14 Maintenance………………………………………………………………………………... 13
15 Electrical characteristics………………………………………………………………….. 14
16 Connection diagram……………………………………………………………………….. 15
Standard Output…………………………………………………………………… 15
Double Output…………………………………………………………………….. 15
17 Wiring the serial communication bus…………………………………………………….. 16
18 Change phase current rated input 1A or 5A…………………………………………….. 16
19 I2t = constant element……………………………………………………………………… 17
20 Inverse time unbalance protection………………………………………………………... 18
21 Oil/iron thermal image curves……………………………………………………………. 19
22 Windings’ thermal image curves…………………………………………………………. 20
23 Direction for pcb’s draw-out and plug-in………………………………………………... 21
24 Overall dimensions………………………………………………………………………… 21
25 Keyboard operational diagram…………………………………………………………… 22
26 Setting’s form………………………………………………………………………………. 23
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Pag. 3 of 23

1. GENERAL UTILIZATION AND COMMISSIONING DIRECTIONS

Always make reference to the specific description of the product and to the
Manufacturer's instruction.
Carefully observe the following warnings.
1.1 - STORAGE AND TRANSPORTATION,
must comply with the environmental conditions stated on the product's instruction or by the
applicable IEC standards.
1.2 − INSTALLATION,
must be properly made and in compliance with the operational ambient conditions stated by
the Manufacturer.
1.3 - ELECTRICAL CONNECTION,
must be made strictly according to the wiring diagram supplied with the Product, to its electrical
characteristics and in compliance with the applicable standards particularly with reference to
human safety.
1.4 − MEASURING INPUTS AND POWER SUPPLY,
carefully check that the value of input quantities and power supply voltage are proper and within
the permissible variation limits.
1.5 − OUTPUTS LOADING,
must be compatible with their declared performance.
1.6 − PROTECTION EARTHING
When earthing is required, carefully check its efficiency.
1.7 − SETTING AND CALIBRATION
Carefully check the proper setting of the different functions according to the configuration of the
protected system, the safety regulations and the co-ordination with other equipment.
1.8 - SAFETY PROTECTION
Carefully check that all safety means are correctly mounted, apply proper seals where
required and periodically check their integrity.
1.9 − HANDLING
Notwithstanding the highest practicable protection means used in designing M.S. electronic
circuits, the electronic components and semiconductor devices mounted on the modules can be
seriously damaged by electrostatic voltage discharge which can be experienced when handling
the modules.
The damage caused by electrostatic discharge may not be immediately apparent but the design
reliability and the long life of the product will have been reduced. The electronic circuits produced
by M.S. are completely safe from electrostatic discharge (15 KV IEC 255.22.2) when housed in
their case; withdrawing the modules without proper cautions expose them to the risk of damage.
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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 alterated 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 CHARACTERISTICS

Input currents are supplied to 4 Current Transformers: - three measuring phase current - one
measuring the earth fault zero-sequence current. Phase current rated input can be 1 or 5A
For zero-sequence current, taps for 1A and 5A input are provided on relay's terminal board.
Make electric connection in conformity with the diagram reported on relay's enclosure.
Check that input currents are same as reported on the diagram and on the test certificate.
The auxiliary power is supplied by a built-in interchangeable module fully isolated and self protected.
2.1 POWER SUPPLY
The relay can be fitted with two different types of power supply module :

 24V(-20%) / 110V(+15%) a.c.  80V(-20%) / 220V(+15%) a.c.

a) -  b) - 
 24V(-20%) / 125V(+20%) d.c.  90V(-20%) / 250V(+20%) d.c.
Before energising the unit check that supply voltage is within the allowed limits.
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3. CONTROLS AND MEASUREMENTS

Five key buttons allow for local management of all relay's functions.
A 8-digit high brightness alphanumerical display shows the relevant readings (xxxxxxx)
(see synoptic table fig.1)
FIG.1
MODE SELECT + - ENTER

ACT MEAS Actual measuremant values

MAX VAL. Max. values measured

MEASURES Scanning of
LASTTRIP Values measured at last tripping
Measurements
the menus by
display TRIP NUM N° of tripping for each function the key
“+” “-”
SETTINGS Display of setting
SET DISP
F→RELAY Display of configuration of output relay
Setting Program
display Paramater scanning
by the key
(*) PROG SELECT
SETTINGS Setting of parameters
PROGR Parameter modification
F→RELAY Configuration of output relays by the key “+” “-”
Set Programming
Set validation
by the key ENTER

W/O TRIP Test with operation of signals only

TEST PRG
WithTRIP Test activation
Functional Test Test with operation of signals and output relays
by the key ENTER
(*)
(*) Enabled only if input current is zero
Pressing this button progressively
The + and - buttons are used to
selects between
select the actual measurement or
Measurements Display,
display desired when in
Setting Display, Programming,
Measurements Display or Settings
and Test modes
Display modes. When in Program
MODE SELECT
+ mode, these buttons increase or
The SELECT button chooses decrease the value of the
which category of values within displayed setting.
the chosen mode to display
PROG
-
When in Program mode, and
When in Program mode, this
when all input currents are zero,
button stores the newly selected ENTER/RESET
pressing this recessed button
value. If not in Program mode and
places the relay into active
the relay has tripped, this button
programming mode, allowing any
resets the relay and all output
or all of the relays settings to
contacts. If not tripped, this button
altered.
restores the default display.
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4. SIGNALIZATIONS
Eight signal leds (normally off) are provided:
a) Red LED T> : - Flashing when the level of the oil/iron thermal element reaches the set
alarm temperature [Ta].
- Illuminated when the oil / iron’s temperature reaches 125% or the
windings’ temperature reaches 200%
b) Red LED I>->> : - Flashing when the measured current reaches the set current level
[I>] or [I>>].
- Illuminated on trip after expire of the set trip time delay [tI>] or [tI>>]
c) Red LED Io>->> : - Same as above related to [Io>], [Io>>]
d) Yellow LED Is>->> : - Same as above related to [1Is], [2Is]
2
e) Red LED I t : - Flashing when current overcomes 2 x [It];
- Illuminated when I²·t ≥ [2It] ∗ [t2].
f) Red LED BR. FAIL. : - Lit-on when the BREAKER FAILURE function is activated.
g) Yellow LED PROG/IRF : - Flashing during the programming of the parameters or in case of
Internal Relay Fault.
h) Red LED BLOCK INPUT : - Flashing when a blocking signal is present at the relevant input
terminals.
- Lit-on when a Remote Trip has been operated by the RT input
(terminals 1-14)
The reset of the leds takes place as follows:
- Leds a,b,c,d,e,f : -From flashing to off, automatically when the lit-on cause disappears.
-From ON to OFF, by "ENTER/RESET" push button only if the tripping cause
has disappeared.
- Leds g,h : -From ON to OFF, automatically when the lit-on cause disappears.
In case of auxiliary power supply failure the status of the leds is recorded and reproduced when power
supply is restored.
5. OUTPUT RELAYS
Five output relays are available (R1, R2, R3, R4, R5)
a) - The relays R1,R2,R3,R4 are normally deenergized (energized on trip): these output relays are user
programmable and any of them can be associated to one of the IM30-T's functions. One relay
eventually associated to the instantaneous element of one of the functions, picks-up and drops-out
instantaneously as soon as current comes respectively above or below the set level. If the current
remains above the trip level longer then the time delay programmed for the relevant function, the
drop-out of the instantaneous relay is anyhow forced after an adjustable waiting time [tBO].(Breaker
failure protection control). It has to be remarked that the programming structure does not allow to
associate the same relay to instantaneous and delayed elements. Therefore any relay already
associated to any time delayed element or to Remote Trip RT cannot be associated to any
instantaneous element and viceversa.
b) - The relay R5, normally energized, is not programmable and it is deenergized on:
- internal fault
- power supply failure
- during the programming
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6. SERIAL COMMUNICATION (Optional: see relevant instruction manual)

The relays fitted with the serial communication option can be connected via a cable bus or (with
proper adapters) a fiber optic bus for interfacing with a Personal Computer (type IBM or compatible).
Via the communication bus all settings and commands available on relay's keyboard can be operated from
the computer and viceversa all information available at relay's level can be received at computer's level.
The transmission standard is RS485 (converter 485/232 available).
Each relay is identified by its programmable address code (NodeAd) and can be called from the P.C. fitted
with a WINDOWS (version 3.1 or later) program driven by the application program supplied by
Microelettrica Scientifica.

7. DIGITAL INPUTS

Three inputs active when the relevant terminals are shorted are provided:

- Bf (terminals 1 - 2) : it blocks the operation of the of the time delayed elements relevant to phase
fault detection;.

- Bo (terminals 1 - 3) : it blocks the operation of the time delayed elements relevant to earth fault
detection.

When a function is blocked the pick-up of its output is inhibited. Programming allows to have the
inhibition either permanent as long as the blocking input is active or automatically removed
with a programmable wait-time (see page 11 : tBf , tBo) after the operation of the time delayed function.
By proper interconnection of the blocking inputs output among different relays it is possible to configurate
very efficient arrangements of logic fault discrimination as well as to feature a safe and quick breaker back-
up protection.

- RT (terminals 1 - 14) : energized the output relay programmed for Remote Trip.

8. TEST

Besides the normal "WATCHDOG" and "POWERFAIL" functions, a comprehensive program of self-test
and self-diagnostic provides:
- Diagnostic and functional test, with checking of program routines and memory's content, run
every time the aux. power is switched-on: the display shows the type of relay and its version
number.
- Dynamic functional test run during normal operation every 15 min. (relay's operation is
suspended for less than 10 ms). If any internal fault is detected, the display shows a fault
message, the Led "PROG / I.R.F." illuminates and the relay R5 is deenergized.
- Complete test activated by the keyboard or via the communication bus either with or without
tripping of the output relays.
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9. KEYBOARD AND DISPLAY OPERATION

All controls can be operated from relay's front or via serial communication bus.
The keyboard includes five hand operable buttons (MODE)-(SELECT)-(+)-(-)-(ENTER/RESET)
plus one indirectly operable key (PROG) (see synoptic table a fig.1):
a) - White key MODE: when operated it enters one of the following operation modes indicated on
the display:
MEASURE = Reading of all the parameters measured and of those stored in the memory
SET DISP = Reading of the settings and of the configuration of the output relays as
programmed.
PROG = Access to the programming of the settings and of the relay's configuration.
TEST PROG = Access to the manual test routines.
b) - Green key SELECT : when operated it selects one of the menus available in the actual
operation MODE
c) - Red keys"+" e "-" : when operated they allow to scroll the different information
available in the menu entered by the key SELECT
d) - Yellow key ENTER/RESET : it allows the validation of the programmed settings - the actuation
of test programs - the reset of the signal Leds (and of the time
delayed output relays if manual reset has been programmed).
e) - Indirect key PROG : enables access to the programming

10. READING OF MEASUREMENTS AND RECORDED PARAMETERS

Enter the MODE "MEASURE", SELECT the menus "ACT.MEAS"-"MAX VAL"-"LASTTRIP"-
-"TRIP NUM", scroll available information by key "+" or "-" .
ACT.MEAS = Actual values as measured during the normal operation.
The values displayed are continuously refreshed.
Display Description
I/Inxxx% Highest among the 3 phase-currents displayed as % of the rated current of phase C.Ts
IAxxxxxA True R.M.S. value of the current of phase A displayed as primary Amps.(0-99999)A
IBxxxxxA As above, phase B.
ICxxxxxA As above, phase C.
IoxxxxxA As above, earth fault current.
Twxxx%Tn Actual windings’ temperature rise displayed as % of full load (I = [It]) steady state
temp.Tn
Tfxxx%Tn Actual oil/iron temperature rise displayed as % of full load (I = [It]) steady state
temp.Tn
Id/txxx% Positive sequence component of currents systems, displayed as % of full load current [It].
Is/txxx% Negative sequence component of currents system, displayed as % of full load current [It].
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MAX VAL = Highest values recorded starting from 1sec after closing of main Circuit Breaker
plus inrush values recorded within the first 1sec from Breaker closing, (refreshed
any time the breaker closes).
Display Description
IAxx.xIn Highest value recorder for R.M.S current of phase A
IBxx.xIn As above for phase B.
ICxx.xIn As above for phase C.
Ioxx.xOn As above for Earth Fault current.
Twxxx%Tn As above for windings’
Tfxxx%Tn As above for oil/iron
Is/txxx% As above for negative sequence component of current
SAxx.xIn Inrush value recorded for R.M.S. current of phase A
SBxx.xIn As above for phase B.
SCxx.xIn As above for phase C.
Soxx.xOn As above for Earth Fault current.
SIsxxxx% As above for negative sequence component of current
LASTTRIP = Display of the function which caused the last timed tripping of the relay plus values
of the parameters at the moment of tripping. The memory buffer is refreshed at
each new relay tripping.
Display Description
Causexxx Display of the function which caused the last tripping: I>; I>>; O>; O>>; I2t;
1Is; 2Is; T>
IAxx.xIn Current of phase A.
IBxx.xIn Current of phase B.
ICxx.xIn Current of phase C.
Ioxx.xOn Earth fault current.
Twxxx%Tn Temperature windings’
Tfxxx%Tn Temperature oil/iron
Id/txxx% Positive sequence component of current
Is/txxx% Negative sequence component of current
TRIP NUM = Counters of the number of operations for each of the relay functions.
The memory is non-volatile and can be cancelled only with a secret procedure.
Display Description
I> xxxx Time delayed low set overcurrent
I>>xxxx Time delayed high set overcurrent
O>xxxx Time delayed low set earth fault
O>>xxxx Time delayed high set earth fault
Tw>xxx Thermal windings’
Tf>xxx Thermal oil/iron
I2txxxxx Inrush energy
1Isxxxxx Inverse time low set negative sequence overcurrent
2Isxxxxx Time delayed high set negative sequence overcurrent
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11. READING OF PROGRAMMED SETTINGS AND RELAY'S CONFIGURATION

Enter the mode "SET DISP", select the menu "SETTINGS" or "F→RELAY", scroll information
available in the menu by keys "+" or "-".
SETTINGS= values of relay's operation parameters as programmed
F→RELAY= output relay associated to the different functions as programmed.

12. PROGRAMMING
The relay is supplied with the standard default programming used for factory test. [Values here below
reported ( ----- ) ].
All parameters can be modified as needed in the mode PROG and displayed in the mode SET DISP
Programming is enabled only if no input current is detected (main switch open).
As soon as programming is enabled, the Led PRG/IRF flashes and the reclosing lock-out relay R5 is
deenergized.
Enter MODE "PROG" and SELECT either "SETTINGS" for programming the setting of parameters
or "F→RELAY" for programming the configuration of output relays.
Enable programming by the indirect operation key PROG.
The key SELECT now scrolls the available parameters. By the key (+) , (-) the displayed values can be
modified; to speed up parameter's variation press the key SELECT while "+" or "-" are pressed. Press key
"ENTER/RESET" to validate the new set values.
12.1 - PROGRAMMING OF FUNCTIONS SETTINGS

In 500 Ap

In is the name 500 is the Ap is the unit of

of the variable setting default measure,
Amps primary.
Mode PROG menu SETTINGS. (Production standard settings here under shown).
Display Description Setting Range Step Unit
Fn 50Hz Mains frequency 50 - 60 10 Hz
In 500Ap Rated primary current of the phase C.Ts. 0 - 9999 1 A
On 500Ap Rated primary current of the C.Ts. or of the tore C.T. supplying 0- 9999 1 A
the zero sequence current
It 0.5In Rated current of the thermal element as p.u. of rated current of 0.50 – 2.00 0.01 In
phase C.Ts
tw 3min Warming-up time constant of the windings’ thermal element 1 - 60 1 min
tf 10 min Warming-up time constant of the oil/iron thermal element 10 - 400 1 min
t2 0.1 s Trip time delay of the I2t element when I = 2[It] 0.1 - 10 - Dis 0.1 s
Ta/n 50% Thermal prealarm temperature as % of full load (I = It) steady 50 - 120 1 %
state temperature Tn
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Display Description Setting Range Step Unit

I> 0.5In Trip level of low-set overcurrent element as p.u. of the rated 0.50 – 9.99 - Dis 0.01 In
current of the phase C.Ts
tI> 0.05s Trip time delay of the low-set overcurrent element 0.05 - 30 0.01 s
I>> 0.5In Trip level of high-set overcurrent element as p.u. of the rated 0.5 - 20 - Dis 0.1 In
current of the phase C.Ts
tI>>0.05s Trip time delay of the high-set overcurrent element 0,05 - 3 0.01 s
O>0.02On Trip level of low-set earth fault element as p.u. of the rated 0.02 – 0.4 - Dis 0.01 On
current of the C.Ts. for zero sequence detection
tO> 0.05s Trip time delay of low-set earth fault element 0,05 - 30 0.01 s
O>>.04On Trip level of high-set earth fault element as p.u. of the rated 0.4 – 2.0 - Dis 0.01 On
current of the C.Ts. for zero sequence detection
tO>> .05s Trip time delay of low-set earth fault element 0.05 - 3 0.01 s
1Is 0.2It Trip level of low-set negative sequence o.c. element as p.u.of It 0.2 – 0.8 - Dis 0.1 It
t1Is 1 s Inverse time delay of element 1Is when Is = It (see curves) 1-8 1 s
2Is 0.2It Trip level of high set negative sequence o.c. element as p.u. of It 0.2 – 2.0 - Dis 0.1 It
t2Is.05s Trip time delay of high set negative sequence o.c. element 0.05 - 3 0.01 s
tBO0.05s Max reset time delay of the instantaneous element after tripping 0.05 - 0.25 0.01 s
of the delayed element
NodAd 1 Identification number for connection on serial communication 1 - 250 1 -
bus

The setting Dis. indicates that the function is disactivated

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12.2 - PROGRAMMING THE CONFIGURATION OF OUTPUT RELAYS

I> - 2 - 4

This is the name of This dash means The number 2 This dash means The number 4 means
protective element that output relay means that that output relay that output relay 4 will
number 1 is not output relay 2 number 3 is not operate when this
assigned to this will operate when assigned to this element trips
element this element trips element

Mode PROG menu F→RELAY (Production standard configuration here under shown).
The key "+" operates as cursor; it moves through the digits corresponding to the four programmable relays in the
sequence 1,2,3,4 (1= relay R1, etc.) and makes start flashing the information actually present in the digit. The
information present in the digit can be either the number of the relay (if this was already associated to the function
actually on programming) or a dot (-) if the relay was not yet addressed.
The key "-" changes the existing status from the dot to the relay number or viceversa.
After having programmed all the four relay, press “ ENTER “ to validate the programmed configuration.
Display Description
I> --3- Instantaneous element of low-set overcurrent operates relays R1, R2, R3, R4.
tI> 1--- As above, time delayed element operates R1, R2, R3, R4.
I>> --3- Instantaneous element of high-set overcurrent operates relay R1, R2, R3, R4.
tI>> 1--- As above time delayed element operates relay R1, R2, R3, R4.
O> ---4 Instantaneous element of low-set earth fault element operates relay R1, R2, R3, R4.
tO> -2-- As above time delayed element operates R1, R2, R3, R4.
O>> ---4 Instantaneous element of high-set earth fault element operates relay R1, R2, R3, R4.
tO>> -2-- As above time delayed element operates relay R1, R2, R3, R4
T> 1--- Thermal overload element operates relay R1, R2, R3, R4.
Ta -2-- Thermal prealarm operates relay R1, R2, R3, R4.
I²t 1--- Energy inrush element operate relay R1, R2, R3, R4.
t1Is 1--- Inverse time low-set negative sequence o.c. element operates relay R1, R2, R3, R4.
t2Is -2-- Definite time high-set negative sequence o.c. element operates relay R1, R2, R3, R4.
RT 1--- Remote Trip input operates relay R1, R2, R3, R4 (cannot be associated to a relay controlled by an
instantaneous element).
TFRES: A The reset after tripping of the relays associated to the time delayed elements (tI>, tI>>, tO>, tO>>,
T>, Ta, I2t, t1Is, t2Is) can take place:
(A) automatically when current drops below the trip level.
(M) manually by the operation of the "ENTER/RESET" key.
Bf I>>I> The input (Bf) for blocking the operation of the time delayed elements relevant to
functions I>, I>> can act on the function (I>) only or (I>>) only, or on both (I>, I>>)
BoO>>O> The input (Bo) for blocking the operation of the time delayed elements relevant to functions
O>, O>> can act on the function (O>) only or (O>>) only, or on both (O>,O>>).
tBf 2tB0 The blocking of the elements I>, I>> can be programmed so that it lasts as long as the blocking input
signal is present (tBf Dis) or so that, even with the blocking still present, it only lasts for the set trip
time delay (tI>, tI>>) of the function plus an additional time 2xtBO (tBf 2tBO).
tBo 2tB0 As above, for the earth fault elements.
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13. MANUAL TEST FUNCTION

- Mode "TESTPROG" subprogram "W/O TRIP":

Operation of the yellow key activates a complete test of the electronics and the process routines.
All the leds are lit-on and the display shows (TEST RUN).
If the test routine is successfully completed the display switches-over to the pre-existing reading.
If an internal fault is detected, the display shows the fault identification code and the relay R5 is
deenergized. This test can be carried-out even during the operation of the relay without affecting
the relay tripping in case a fault takes place during the test itself.

- Mode "TESTPROG" subprogram "WithTRIP":

Access to this program is enabled only if the current detected is zero (breaker open).
Pressing the yellow key the display shows "TEST RUN?". A second operation of the yellow key
starts a complete test which also includes the activation of all the output relays.
The display shows (TEST RUN) with the same procedure as for the test with WithTRIP.
Every 15 min during the normal operation the relay automatically initiates an auto test procedure
(duration ≤ 10ms). If any internal fault is detected during the auto test, the relay R5 is deenergized,
the relevant led is activated and the fault code is displayed.

- Further operation of key SELECT instead of the TEST programs gives the indication of the version
and production date of the firmware.

CAUTION
Running the WithTRIP test will operate all of the output relays. Care must be taken to ensure that no
unexpected or harmful equipment operations will occur as a result of running this test.
It is generally recommended that this test be run only in a bench test environment or after all dangerous
output connections are removed.

14. MAINTENANCE

No maintenance is required. Periodically a functional check-out can be made with the test procedures
described under MANUAL TEST chapter. In case of malfunctioning please contact Microelettrica
Scientifica Service or the local Authorised Dealer mentioning the relay's Serial No reported in the label on
relays enclosure.
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Pag. 14 of 23

15. ELECTRICAL CHARACTERISTICS

- Reference standards IEC 255, IEC1000; IEEE C37; CE Directive

- Dielectric test voltage IEC 255-5 : 2kV, 1 min.
- Impulse test voltage IEC 255-5 : 5kV (c.m.), 2 kV (d.m.) - 1,2/50µs
- HF disturbance test with damped
oscillatory wave (1MHz burst test) IEC255-22-1 class 3 : 2,5kV (m.c.), 1kV (d.m.)
- Electrostatic discharge test IEC1000-4-2 level 4 : 15 kV
- Conducted disturbances immunity test IEC1000-4-6 level 3 : 0.15-80MHz, 10V/m
- Radiated electromagnetic field immunity test IEC1000-4-3 level 3 : 80-1000MHz, 10V/m
- Electrical fast transient/burst IEC1000-4-4 level 4 : 4kV, 2.5kHz, 15/300ms (c.m.)
2kV, 5kHz, 15/300ms (d.m.)
- Surge immunity test IEC1000-4-5 level 4 : 4kV(c.m.), 2kV(d.m.)
- Oscillatory waves (Ring waves) IEC1000-4-12 level 4 : 4kV(c.m.), 2kV(d.m.)
- Power frequency magnetic test IEC1000-4-8 : 1000A/m
- Pulse magnetic field IEC1000-4-9 : 1000A/m, 8/20µs
- Damped oscillatory magnetic field IEC1000-4-10 : 1000A/m, 0.1-1MHz
- Immunity test for voltage dips,
short interruptions and voltage variations IEC1000-4-11
- HF inducted voltage IEC1000-4-1 A.2.6 level 4 : 100V, 0.01-1MHz
CE EMC Compatibility:
- Electromagnetic emission EN50081-2
- Radiated electromagnetic disturbance test EN50082-2
- Resistance to vibration and shocks IEC255-21-1, IEC255-21-2
- Accuracy at reference value of 1% In; 0,1% On for measure
influencing factors +/- 10ms for times
- Rated input current In = 1 or 5A, On = 1 or 5A
- Current overload 200A for 1 sec; 10A continuos
- Burden on current inputs Phase : 0.01VA at In = 1A; 0.2VA at In = 5A
Neutral : 0.03VA at On = 1A; 0.2VA at In = 5A
- Average power supply consumption 8,5 VA
- Output relays rating 5 A; Vn = 380 V
A.C. resistive switching = 1100W (380V max)
make = 30 A (peak) 0,5 sec.
break = 0.3 A, 110 Vcc,
L/R = 40 ms (100.000 op.)
- Operation ambient temperature -20°C / +60°C
- Storage temperature -30°C / +80°C

Microelettrica Scientifica S.p.A. - 20089 Rozzano (MI) - Italy - Via Alberelle, 56/68
Tel. (##39) 2 575731 - Fax (##39) 2 57510940 - Telex 351265 MIELIT I
The performances and the characteristics reported in this manual are not binding and can modified at any moment without notice
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16. CONNECTION DIAGRAM (SCE1358 Rev.2 STANDARD OUTPUT)

CONNECTION DIAGRAM (SCE1434 Rev.0 DOUBLE OUTPUT)

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17. WIRING THE SERIAL COMMUNICATION BUS (SCE1309 Rev.0)

18. CHANGE PHASE CURRENT RATED INPUT 1 OR 5A

Connector

Jumper

Rated
Input
Current
Phase A

Rated Input
Current
Phase B

Rated Input
Current
Phase C

Rated Input
Current
Neutral
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19. I2t = constant ELEMENT (TU0285 Rev.0)

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20. INVERSE TIME UNBALANCE PROTECTION (TU0286 Rev.0)

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21. OIL/IRON THERMAL IMAGE CURVES (TU0332 Rev.0)

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22. WINDINGS’ THERMAL IMAGE CURVES (TU0333 Rev.1)

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23. DIRECTION FOR PCB'S DRAW-OUT AND PLUG-IN

DRAW-OUT
Rotate clockwise the screws • and ‚ in the horizontal position of the screws-driver mark.
Draw-out the PCB by pulling on the handle ƒ
PLUG-IN
Rotate clockwise the screws • and ‚in the horizontal position of the screws-driver mark.
Slide-in the card on the rails provided inside the enclosure.
Plug-in the card completely and by pressing the handle to the closed position.
Rotate anticlockwise the screws • and ‚ with the mark in the vertical position (locked).

24. OVERALL DIMENSIONS

PANELDRILLING113x142(LxH)
 MODE MILANO

I=0 I≠0
ITALY

(MEASURES) (SETDISP) (PROGR) (TESTPROG)

MICROELETTRICA SCIENTIFICA

In programming mode
SEL SEL SEL the output relay R5 SEL
is deenergized

MEAS) (MAX VAL) (LastTrip) (TRIPNUM) (SETTINGS) (F→RELAY) (SETTINGS) (F→RELAY)

(SelPrg) ( IM30-T )
/- +/- +/- +/- +/- +/- PRG PRG
(EntPrS) (EntPrS)
I=0 I≠0 (Ver.:x.xx)
I/Inxxx% 0 IAxx.xIn 0 Causexxx 0 I> xxxxx 0 Fn xx Hz 0 I> xxxx
SEL ENT SEL ENT (Dtxxxxxx)
IAxxxxxA 1 IBxx.xIn 1 IAxx.xIn 1 I>>xxxxx 1 InxxxxAp 1 tI> xxxx
(UpDwnS) (UpDwnS) (W/O TRIP) (WithTRIP)
IBxxxxxA 2 ICxx.xIn 2 IBxx.xIn 2 O>xxxxx 2 OnxxxxAp 2 I>> xxxx
+/- +/-
ICxxxxxA 3 Ioxx.xOn 3 ICxx.xIn 3 O>>xxxx 3 Itx.xxIn 3 tI>>xxxx
ENT ENT
IoxxxxxA 4 Twxxx%Tn 4 Ioxx.xOn 4 Tw> xxxx 4 twxxxmin 4 O> xxxx Fn xx Hz I> xxxx
0 0
Twxxx%Tn 5 Tfxx%Tn 5 Twxxx%Tn 5 Tf> xxxx 5 tfxxxmin 5 tO> xxxx InxxxxAp tI> xxxx
1 1 TESTRUN?
Tfxx%Tn 6 Is/txxx% 6 Tfxx%Tn 6 I2t xxxxx 6 t2 xx.xs 6 O>> xxxx OnxxxxAp I>> xxxx
2 2
Id/txxx% 7 SAxx.xIn 7 Id/txxx% 7 1Is xxxx 7 Ta/nxxx% 7 tO>>xxxx Itx.xxIn tI>>xxxx
SEL ENT
3 3
Is/txxx% 8 SBxx.xIn 8 Is/txxx% 8 2Is xxxx 8 I>x.xxIn 8 T> xxxxx twxxxmin O> xxxx
4 4
IM30-T

9 SCxx.xIn 9 tI>x.xxs 9 Ta xxxxx TEST RUN TEST RUN

5 tfxxxmin 5 tO> xxxx
10 S0x.xxOn 10 I>>x.xIn 10 2It xxxx t2 xx.xs O>> xxxx
6 6
SIs xxx% tI>>.xxs t1Is xxxx 1 msgFAULT 1 msgFAULT
11 11 11 7 Ta/nxxx% 7 tO>>xxxx
25. KEYBOARD OPERATIONAL DIAGRAM (D46102 Rev.1)

O>x.xxOn t2Is xxxx 2 I/Inxxx% 2 I/Inxxx%

12 12 8 I>x.xxIn 8 T> xxxxx
13 tO>x.xxs 13 RT xxxx tI>x.xxs Ta xxxxx
9 9
14 O>>.xxOn 14 tFRes: x I>>x.xIn 2It xxxx
10 10
15 tO>>.xxs 15 Bf xxxxx tI>>.xxs t1Is xxxx
11 11
16 1Isx.xIt 16 Bo xxxxx O>x.xxOn t2Is xxxx
12 12
176 t1Isxxxs 17 tBf xxxxx tO>x.xxs RT xxxx
13 13
18 2Isx.xIt 18 tBo xxxxx O>>.xxOn tFRes: x
14 14
19 t2Isxxxs tO>>.xxs Bf xxxxx
15 15
tBOx.xxs
Pag.
Rev.

20 10 1Isx.xIt 16 Bo xxxxx
21 NodAdxxx t1Isxxxs tBf xxxxx
11 17
2

12 2Isx.xIt 18 tBo xxxxx

13 t2Isxxxs
22 of

14 tBOx.xxs

15 NodAdxxx
23
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MILANO ITALY IM30-T Rev. 2
Pag. 23 of 23

26. SETTING’S FORM

Date : Number Relay:
RELAY PROGRAMMING
Default Setting Actual Setting
Variable Value Measurement Unit Variable Value Measurement Unit
Fn 50 Hz Fn Hz
In 500 Ap In Ap
On 500 Ap On Ap
It 0.5 In It In
tw 3 min tw min
tf 10 min tf min
t2 0.1 s t2 s
Ta/n 50 % Ta/n %
I> 0.5 In I> In
tI> 0.05 s tI> s
I>> 0.5 In I>> In
tI>> 0.05 s tI>> s
O> 0.02 On O> On
tO> 0.05 s tO> s
O>> .04 On O>> On
tO>> .05 s tO>> s
1Is 0.2 It 1Is It
t1Is 1 s t1Is s
2Is 0.2 It 2Is It
t2Is. 05 s t2Is. s
tBO 0.05 s tBO s
NodAd 1 ----------- NodAd -----------
CONFIGURATION OF OUTPUT RELAYS
Default Setting Default Setting
Protective Elem. Output Relays Protective Elem. Output Relays
I> - - 3 - I>
tI> 1 - - - tI>
I>> - - 3 - I>>
tI>> 1 - - - tI>>
O> - - - 4 O>
tO> - 2 - - tO>
O>> - - - 4 O>>
tO>> - 2 - - tO>>
T> 1 - - - T>
Ta - 2 - - Ta
I²t 1 - - - I²t
t1Is 1 - - - t1Is
t2Is - 2 - - t2Is
TFRES: A TFRES:
Bf I>>I> Bf
Bo O>>O> Bo
tBf 2tB0 tBf
tBo 2tB0 tBo