MICROENER IM30-DK Manuale utente

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 1 of 34

MICROPROCESSOR OVERCURRENT

AND DIRECTIONAL EARTH FAULT

PROTECTION RELAY

TYPE

IM30-DK

OPERATION MANUAL

MULTIFUNCTION

OVERCURRENT +

DIRECTIONAL

EARTH FAULT

RELAY TYPE

IM30-DK

ENTER/RESET

MODE

SELECT

PROG.

I>>/>>>

Io>

PROG/

I.R.F.

MICROELETTRICA SCIENTIFICA

MILANO ITALY

Io>>/>>>

BR.FAIL

I2t

Uo>

BLOCK

INPUT

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 2 of 34

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 and operation____________________________________________________ 4

2.1 Power supply_____________________________________________________________________ 4

2.2 Operation and Algorithms___________________________________________________________ 5

2.2.1 Input quantities_______________________________________________________________ 5

2.2.2 Algorithm of the time current curves_______________________________________________ 6

2.2.3 Automatic doubling of the overcurrent pick-up level___________________________________ 7

2.3 Operation of the directional earth fault element___________________________________________8

2.4 Interlocking logic__________________________________________________________________ 10

2.5 Instantaneous outputs and lock-out logic_______________________________________________ 10

2.4 Function blocking inputs____________________________________________________________ 10

2.5 Breaker failure protection____________________________________________________________10

2.6 Breaking energy accumulation_______________________________________________________ 11

2.7 Clock and Calendar________________________________________________________________ 13

2.7.1 Clock synchronization__________________________________________________________ 13

2.7.2 Date and time setting__________________________________________________________ 13

2.7.3 Time resolution_______________________________________________________________ 13

2.3.4 Operation during power off______________________________________________________ 13

2.7.5 Time tolerance_______________________________________________________________ 13

3 Controls and measurements____________________________________________________________ 14

4 Signalization_________________________________________________________________________ 15

5 Output relays_________________________________________________________________________16

6 Serial communication__________________________________________________________________16

7 Digital inputs_________________________________________________________________________17

8 Test________________________________________________________________________________ 17

9 Keyboard and display operation_________________________________________________________ 18

10 Reading of measurements and recorded parameters________________________________________19

10.1 ACT. MEAS (Actual measure)___________________________________________________ 19

10.2 MAX VAL (Max values)_______________________________________________________19

10.3 LASTTRIP (Last trip)_________________________________________________________ 20

10.4 TRIP NUM (Trip number)______________________________________________________ 20

11 Reading of programmed settings and relay’s configuration__________________________________ 20

12 Programming_________________________________________________________________________21

12.1 Programming of functions settings________________________________________________ 21

12.2 Programming the configuration of output relay_______________________________________ 23

13 Manual and automatic test operation_____________________________________________________ 24

13.1 Mode “ TESTPROG “ subprogram “ W/O TRIP “_____________________________________ 24

13.2 Mode “ TESTPROG “ subprogram “ With TRIP “_____________________________________ 24

14 Maintenance_________________________________________________________________________ 24

15 Power frequency insulation test_________________________________________________________ 24

16 Electrical characteristics_______________________________________________________________ 25

17 Connection diagram (Standard Output)____________________________________________________ 26

18 Wiring the serial communication bus_____________________________________________________27

19 Change phase rated input 1A or 5A______________________________________________________ 27

20 Time current curves IEC_______________________________________________________________ 28

21 Time current curves IEEE______________________________________________________________ 29

22 Direction for pcb’s draw-out and plug-in__________________________________________________ 30

22.1 Draw-out____________________________________________________________________ 30

22.2 Plug-in______________________________________________________________________30

23 Overall dimensions____________________________________________________________________31

24 Keyboard operational diagram__________________________________________________________ 32

25 Setting’s form - Commissioning Test Record______________________________________________ 33

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 3 of 34

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 reduced by

M.S. are completely safe from electrostatic discharge (8 KV IEC 255.22.2) when housed in their

case; withdrawing the modules without proper cautions expose them to the risk of damage.

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 4 of 34

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 quantities are supplied to 1 Potential Transformer and to 4 Current Transformers (- three

measuring phase current - one measuring the earth fault zero-sequence current).

Rated current input can be 1 or 5A. The zero sequence polarizing voltage input is rated 100V (from

V1:3/100:3 V open delta connected V.Ts.).

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 an 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.

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 5 of 34

2.2 –Operation and Algorithms

2.2.1 –Input Quantities

System Frequency

The system frequency Fn can be set to 50 or 60 Hz

Current inputs (See Connection Diagram § 16)

The relay directly displays the r.m.s. value of 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 we have to

load the value of the Rated Primary Current ” In “ of the phase CTs:

In = (1-9999)A, adjustable in steps of 1A.

Similarly for the Residual (Zero Sequence) Current, we have to load the value of the Rated Primary

Current On=(1-9999)A, adjustable in steps of 1A.

If the input of the Earth Fault element is supplied by the Residual connection of the 3 phase CTs, we

shall set for “ On “ the same value as “ In “.

If the input of the Earth Fault element is supplied by a separated Core Balance CT, or by another

CT, “ On “ value will be the Rated Primary Current of this CT, normally different from “ In “.

The Rated Secondary Current of the CTs, can be either 1A of 5A.

For the Phase Current inputs, 1A or 5A configuration can be selected by moving the jumpers

provided on the CT input card (see § 18).

For the Earth Fault Current input, configuration is obtained by the jumper “J4”.

Example :

Phase CTs 1500/5A and Core Balance CT 100/1A

Load In = 1500A and On = 100A

Configure CT input card with jumpers J1, J2, J3 in the 5A position.

Configure Earth Fault input in the 1A position by the jumper “J4”.

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 6 of 34

2.2.2 - ALGORITHM OF THE TIME CURRENT CURVES (see § 19 and 20)

For the function “1I” (first overcurrent level F51) and “1O” (first Earth Fault level F51/67N) it is possible

to program either an Independent Definite Time operation or a Dependent Inverse Time operation

selectable among 8 different types.

Each Inverse time operation type offers a family of TCC definable by the relevant programmable

variable.

For the other functions (2I, 3I, 2O, 3O, Uo) the operation is Independent Definite Time only with

adjustable time delay.

The Time Current Curves are generally calculated with the following equation:

where

t(I) = Actual trip time delay when the input current equals I

Is = Set minimum pick-up level

K =

Ts= Set time delay : t(I) = Tswhen

tr = Operation time of the output relay on pick-up

The constant “ A “ , “ B “ and “ a “, have different values for the different Time Current Curves

Curve Name

Curve Identifier

IEC A Inverse

0.14

0.02

IEC B Very Inverse

13.5

IEC C Extr. Inverse

IEEE Moderate Inverse

0.0104

0.0226

0.02

IEEE Short Inverse

0.00342

0.00262

0.02

IEEE Very Inverse

3.88

0.0963

IEEE Normally Inverse

5.95

0.18

IEEE Extr. Inverse

5.67

0.0352

For the IEC curves, being B = 0, the Time/Current equation (1), becomes:

Where Kt = (10a-1)Ts is the time multiplier

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

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







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IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 7 of 34

2.2.3 –Automatic doubling of the overcurrent pick-up level

For the second “2I” and third “3I” overcurrent elements, it is possible to have a temporary doubling of

the set minimum pick-up level during current inrush.

If at C/B closure the current rises from 0 to 1.5 times the relay rated input current “In” in less than

60ms (dI/dt > 25 In/s), the set pick-up level “2I” and/or “3I” is automatically doubled (example: 2I =

10In becomes 20In).

As soon as the current drops below 1.25xIn the duplicated pick-up level comes back to its original

setting.

The doubling function is activated by programming the variables “2Ix2” an “3Ix2”.

2Ix2

Doubling of the pick-up level 2I

2Ix2

OFF

No doubling for 2I

3Ix2

Doubling of the pick-up level 3I

3Ix2

OFF

No doubling for 3I

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 8 of 34

2.3 - OPERATION OF THE DIRECTIONAL EARTH FAULT ELEMENT

It is assumed



Set minimum pick-up residual current : 3Io xO

(three adjustable pick-up levels 1O, 2O, 3O)



xUO

Set minimum residual voltage (3Uo) to enable Is pick-up

(three adjustable pick-up levels 1UO, 2UO, 3UO)





Set characteristic angle (max. torque angle) of displacement of residual current 3Io from

residual voltage 3Uo.



3Io

Actual earth fault relay’s input current



3Uo

Actual earth fault relay’s input voltage



o

Displacement of 3Io from 3Uo



Io

Component of 3Io in the direction 

Io= 3Io cos(o-)

The earth fault element can operate in three different ways according to the programming of the

variable F:

F= Dis

The element just operates as a normal overcurrent element without either

residual voltage control (3 Uo) and directional control

- The element operates if: 3Io [xO]

F= Sup

The element just operates with supervision of the current flow direction.

The element operates if the following 3 conditions are present:

-The input residual voltage 3Uo exceeds the set [xUO]: 3Uo [xUO]

-The input residual current 3Io exceeds the set [xO] : 3Io [xO]

-The displacement o of 3Io from 3Uo is within ±90° from the set direction [] : -90 o -90

3Uo

3Io

Scatto

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 9 of 34

F= Dir

The element performs a complete directional operation; pick-up takes place if the following conditions

are present:

-The input residual voltage 3Uo exceeds the set level [xUO] : 3Uo [xUO]

-The component of the input residual current 3Io in the direction exceeds the set level [xO] :

3Io cos(o - ) [xO]

The characteristic angle must be selected according to the kind of earthing of the installation.

Typical setting are:

UNEARTHED NEUTRAL



90°

NEUTRAL EARTHED VIA RESISTOR



0°

SOLIDLY EARTHED NEUTRAL



60°

IM30-DK

Doc. N° MO-0040-ING

Rev. 2

Pag. 10 of 34

2.4 –Interlocking logic

Different relays can be each-other interlocked thus allowing to implement accelerated selectivity

scheems with all time delay set at the same level.

2.4.1 –Instantaneous outputs and lock-out logic

Generally one instantaneous and one time delayed elements are provided for each Protection

Function. Programming of the configuration of the output relays allows to have any of them

controlled either by the time delayed element or by the instantaneous element of one or more

Protection Functions. The output relays controlled by instantaneous elements pick-up as soon as the

current exceeds the set trip level and drop-off as soon as the current drops below the reset level.

If the relay was energized by the instantaneous element and after tripping of the time delayed

element of the same function (even if this is programmed to control a different output relay) the

current does not drop below the set level (Circuit Breaker did not open) the output relay is any-how

deenergized after an additional time delay “tBF”. If this relay was used to block the operation of

another Protection Relay, this will be released and will then trip a back-up C/B.

2.4.2 –Function Blocking Inputs

When the terminals 1-2 of the digital input B2 are shorted, it is possible to block the operation of the

time delayed element of the function according to the programming of the corresponding parameter:



ON/OFF (If set to ON, the activation of the input B2 blocks the time

delayed

element of the function)



ON/OFF



ON/OFF



ON/OFF



ON/OFF



ON/OFF

2.5 –Breaker Failure Protection

The Breaker Failure function is related to the functions programmed to operate the output relay R1.

If, after R1 has been energized, the input current does not drop to zero within the set time “tBF”,

another output relay is energized for giving an alarm of tripping a back-up C/B.

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