MICROELETTRICA MC40 Bedienungsanleitung

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

MICROPROCESSOR

OVERCURRENT and EARTH FAULT

RELAY

TYPE

OPERATION MANUAL

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

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 - Waste Disposal of Electrical & Electronic Equipment __________________________________________________4

1.12 - Fault detection and repair ______________________________________________________________________4

2. General Characteristics _____________________________________________________________________________5

2.1 - Power Supply ________________________________________________________________________________5

2.2 - Operation and Algorithms _______________________________________________________________________6

2.2.1 - Reference Input Values _____________________________________________________________________6

2.2.2 - Input quantities ___________________________________________________________________________6

2.2.3 - Time Current Curves IEC (TU1029 Rev.0) _______________________________________________________8

2.2.4 - Time Current Curves IEEE (TU1028 Rev.0) ______________________________________________________9

3. Functions and Settings (Function) ____________________________________________________________________10

3.1 - T> (F49) - Thermal Image protection level_________________________________________________________10

3.1.1 - Thermal Image Curves (TU0445 Rev.0)________________________________________________________11

3.2 - I> (1F51) - First overcurrent protection level _______________________________________________________12

3.3 - I>> (2F51) - Second overcurrent protection level ___________________________________________________12

3.4 - IH (3F51) - Third overcurrent protection level ______________________________________________________13

3.4.1 –Automatic doubling or Overcurrent thresholds on current inrush ____________________________________13

3.5 - Io> (1F51N) - First Earth Fault protection level _____________________________________________________14

3.6 - Io>> (2F51N) - Second Earth Fault protection level __________________________________________________14

3.7 - IoH (3F51N) - Third Earth Fault protection level _____________________________________________________15

3.8 - BF (F51BF) - Breaker Failure____________________________________________________________________15

3.9 - RTD - Remote Trip ___________________________________________________________________________15

3.9 - I.R.F. - Internal Relay Failure ___________________________________________________________________16

3.10 - CBMng –Close Breaker Manage ________________________________________________________________16

3.11 - Osc - Oscillographic Recording _________________________________________________________________17

3.12 - Comm –Communication Parameters ____________________________________________________________17

3.13 - LCD –Display and Buzzer operation _____________________________________________________________18

4. Logic Blocking of Functions _________________________________________________________________________18

4.1 - Blocking Outputs _____________________________________________________________________________18

4.2 –Blocking Inputs______________________________________________________________________________18

5. Output Relays ___________________________________________________________________________________18

6. Digital Inputs____________________________________________________________________________________19

7. Self-diagnostic___________________________________________________________________________________19

8. Relay Management _______________________________________________________________________________20

9. Signalizations ___________________________________________________________________________________21

10. Keyboard Buttons _______________________________________________________________________________21

11. Serial Communication Port ________________________________________________________________________22

11.1 - Main RS485 Serial Communication Port __________________________________________________________22

11.2 - Communication Port on Front Face Panel _________________________________________________________23

12. Menu and Variables ______________________________________________________________________________24

12.2 - Real Time Measurements _____________________________________________________________________24

12.2 - Meas (Instantaneous Measurements) ____________________________________________________________24

12.3 - Counter (Operation Counters)__________________________________________________________________24

12.4 - LastTrip (Event Recording) ____________________________________________________________________25

12.5 - R/W Set (Programming / Reading the Relay Settings) _______________________________________________26

12.5.1 - CommAdd (Communication Address)_________________________________________________________26

12.5.2 - Time/Date (Time/Date) ___________________________________________________________________26

12.5.3 - RatedVal (Rated Input Values) ______________________________________________________________26

12.5.4 - Function (Functions)______________________________________________________________________27

12.6 - RelayCfg (Relay Configuration) _________________________________________________________________29

12.7 - Commands ________________________________________________________________________________29

12.8 - Info&Ver (Firmware - Info&Version) _____________________________________________________________29

12. Keyboard Operational Diagram _____________________________________________________________________30

14. Password ______________________________________________________________________________________31

14.1 - MS-Com Password___________________________________________________________________________31

15. Maintenance ___________________________________________________________________________________31

16. Power Frequency Insulation Test ____________________________________________________________________31

17. Connection Diagram _____________________________________________________________________________32

18. Overall Dimensions ______________________________________________________________________________32

19. Direction for Pcb's Draw-Out and Plug-In _____________________________________________________________33

19.1 - Draw-Out _________________________________________________________________________________33

19.2 - Plug-In ___________________________________________________________________________________33

20. Electrical Characteristics __________________________________________________________________________34

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

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 effectiveness.

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.

Before removing a module, ensure that you are at the same electrostatic potential as the equipment by

touching the case.

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.

Do not pass the module to any person without first ensuring that you are both at the same electrostatic

potential. Shaking hands achieves equipotential.

Place the module on an antistatic surface, or on a conducting surface which is at the same potential as

yourself.

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.

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

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 - Waste Disposal of Electrical & Electronic Equipment

(Applicable throughout the European Union and other European countries with separate collection program).

This product should not be treated as household waste when you wish dispose of it. Instead, it should be handed

over to an applicable collection point for the recycling of electrical and electronic equipment.

By ensuring this product is disposed of correctly, you will help prevent potential negative consequence to the

environment and human health, which could otherwise be caused by inappropriate disposal of this product.

The recycling of materials will help to conserve natural resource.

1.12 - Fault detection and repair

Internal calibrations and components should not be altered or replaced.

For repair, please ask the Manufacturer or its authorized Dealers.

Misapplication of the above warnings and instruction relieves the Manufacturer of any liability.

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

2. General Characteristics

The MC is a very innovative and versatile line of Protective Relays which takes advantage of the long and

successful experience coming from the M-Line.

The main features of the MC-Line relays are:

Compact draw-out execution for Flush Mounting or for assembly in 19” 3U chassis for 19” Rack systems.

User friendly front face with 2x8 characters LCD Display, four signal Leds, four keys for complete local

management and 9-pin socket for local RS232 serial communication.

Four user programmable Output Relays. On request one of the Output Relays can be replaced by a Can Bus

port for control of additional I/O modules.

Three optoisolated, self-powered Digital Inputs.

RS485 communication port (independent from the RS232 port on front panel)

Totally draw-out execution with automatic C.T. shorting device.

Input currents are supplied to 4 current transformers: measuring phase currents.

Current inputs can be 1 or 5A: selection between 1A or 5A is made by movable jumpers provided on the Relay

card. (See Fig 1)

The Measuring Ranges of the different inputs

respectively are:

Phase Currents

(0.1-40) In

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.

2.1 - Power Supply

The auxiliary power is supplied by a built-in module fully isolated a self-protected.

The relay can be fitted with two different types of power supply:

Type 1

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

24V(-20%) / 125V(+20%) d.c.

Type 2

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

90V(-20%) / 250V(+20%) d.c.

Before energizing the unit check that supply voltage is within the allowed limits.

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

2.2 - Operation and Algorithms

2.2.1 - Reference Input Values

Display

Description

Setting Range

Step

Unit

100

Rated Primary current of phase C.T.

9999

Rated Secondary current of phase C.T.

1/5

IN1

Rated Primary neutral

9999

IN2

Rated Secondary neutral

9999

100

Reference primary current of the relay

9999

Freq

System rated frequency

sec

Warming-up time constant for Thermal Image

3600

sec

105

%In

Maximum admissible continuous overload for Thermal Image

130

0.1

%In

2.2.2 - Input quantities

2.2.2.1 - Mains Frequency (Freq)

The relay can operate either in 50Hz or 60Hz systems.

The rated Mains Frequency “Freq” must be set accordingly.

2.2.2.2 - Phase Current inputs (I1)

The relay directly displays the r.m.s. value of the Phase Currents “IA”, “IB”, “IC”, “IN” 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, input the value

“I1” of the primary current of the phase C.Ts

The measure is not displayed below

< 5% In

2.2.2.3 - Earth Fault Current Input (IN1/IN2)

Same as for the Phase Currents, the relay directly displays the r.m.s. value of the Neutral Current flowing

at the Primary of the Current Transformers.

The measure is not displayed below

< 1% On

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

atTKB

t(I) +••













−













=α

2.2.2.4 - Algorithm of the time current curves

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

(1)

where:

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

I = Maximum of the three input currents.

Is = Set minimum pick-up level

K =

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

tr = Operation time of the output relay on pick-up (7ms).

The parameters “A” 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 Extremely 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 Inverse

5.95

0.18

IEEE Extremely Inverse

5.67

0.0352

The maximum measuring current is “40xIn” for phase elements and “10xOn” for the neutral

element.

a110A−













−

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

2.2.3 - Time Current Curves IEC (TU1029 Rev.0)

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

2.2.4 - Time Current Curves IEEE (TU1028 Rev.0)

MC40

Doc. N° MO-0375-ING

Date

06.09.2022

Rev.

Pag.

3. Functions and Settings (Function)

3.1 - T> (F49) - Thermal Image protection level

FuncEnab

→

Enable

[Disable / Enable]

Options

→

No Param

No Parameters

TripLev

→

Tal

%Tb

(50 110)

step

%Tb

→

Tst

100

%Tb

(10 100)

step

%Tb

Timers

→

No Param

No Parameters

Description of variables

FuncEnab

If disable the function is disactivated.

Tal

Thermal prealarm temperature.

Tst

Reset level.

Trip when

The temperature exceeded for time “Tal”.

When the function is tripped

Signalization

Led “Trip” is illuminated

Last Trip

Is recorded

Led reset when

Return in normal condition

Warming-up is computed proportionally to the square of the largest phase current “I”.

-Allowed overloading time (See Curve)

The trip time delay “t”of the thermal element, depends on the warming-up time constant

“tw”, on the previous thermal status (Ip/In)2, on the admissible continuous overload (Ib) and, of

course, on the actual load (I)

Warming-up time constant

(60-3600) s.

Largest of the three phase currents

Preheating current: Steady-State Current corresponding to the thermal status

existing at the moment when the current is increased to the overload value “I”

Continuously admissible current

(50-130) %In, step 0.1%In

Rated primary current of phase C.Ts



Natural logarithm

Reset takes please when the simulated temperature drops below the programming level [Tst].

An alarm signal is issued when the computed warming exceeds the set percentage “Tal” of the Full

Load temperature “Tb”.

:where

(Ib/In)(I/In) (Ip/In)(I/In)

twt22













−

= n



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