P&B MR-REF Manuel utilisateur

MR-REF & MR-REF3 Technical Manual

Issue 3, November 2013

REF & MR

REF3

Technical Manual

Issue 3, November 2013

Contents

1. P&B MR-REF & MR-REF3 .................................................................................................................................................................................1

1.1 Principle of operation...................................................................................................................................................................................2

Unbiased Differential....................................................................................................................................................................2

Restricted Earth Fault Protection for Transformers.......................................................................................................................3

1.3 Displayed Feeder Data................................................................................................................................................................................4

1.4 Control Functions. .......................................................................................................................................................................................4

2. Technical Specification. ......................................................................................................................................................................................5

3. Environmental Tests...........................................................................................................................................................................................6

4. Inputs and Outputs. ............................................................................................................................................................................................7

4.1. Power Supply Live......................................................................................................................................................................................7

4.3. Current Transformer Inputs. .......................................................................................................................................................................7

4.4. Output Relays.............................................................................................................................................................................................7

4.5. Digital Inputs. .............................................................................................................................................................................................7

4.6. RS485 Rear Port. .......................................................................................................................................................................................7

4.7. RS232/USB Front Port. ..............................................................................................................................................................................7

5. Faceplate Functions. ..........................................................................................................................................................................................8

5.1 LED Status ..................................................................................................................................................................................................8

6. LCD Display. ......................................................................................................................................................................................................9

6.1. Menu Screens. ...........................................................................................................................................................................................9

6.2. Display Scroll............................................................................................................................................................................................10

6.3. Feeder Settings........................................................................................................................................................................................11

E/F CT Primary. .........................................................................................................................................................................11

6.4. Serial Settings. .........................................................................................................................................................................................12

6.5. I/O Settings (Input / Output Settings). .......................................................................................................................................................14

6.5.1 Digital Inputs .....................................................................................................................................................................................14

Reset Fault.................................................................................................................................................................................14

Block..........................................................................................................................................................................................14

6.5.2 Relay Outputs ...................................................................................................................................................................................15

Trip.............................................................................................................................................................................................15

Trip Fail Safe.............................................................................................................................................................................. 15

Alarm. ........................................................................................................................................................................................15

Alarm Fail Safe...........................................................................................................................................................................15

Healthy.......................................................................................................................................................................................15

Healthy Fail Safe........................................................................................................................................................................15

Internal Fail. “Intrnl Fail” .............................................................................................................................................................15

Serial Timeout. "Ser Timeout" ....................................................................................................................................................15

6.6. System Settings. .................................................................................................................................................................16

Password. ..................................................................................................................................................................................16

Engineering Password ...............................................................................................................................................................16

Change Password......................................................................................................................................................................16

Contrast and LCD Backlight. ......................................................................................................................................................16

Set Default Page / Default Return Time......................................................................................................................................16

Time Sync Delay. .......................................................................................................................................................................16

Software Version........................................................................................................................................................................ 16

Serial Number. ...........................................................................................................................................................................16

Disturbance Recording Activation Key........................................................................................................................................17

Time and Date............................................................................................................................................................................17

Chronovision ..............................................................................................................................................................................17

Screen Saver and Screen Saver Time .......................................................................................................................................17

6.7. Protect Settings........................................................................................................................................................................................18

Function. ....................................................................................................................................................................................19

Alarm. ........................................................................................................................................................................................19

Trip.............................................................................................................................................................................................19

Block..........................................................................................................................................................................................19

Reset. ........................................................................................................................................................................................19

Auto Reset. ................................................................................................................................................................................19

Panel-Reset. ..............................................................................................................................................................................19

Serial-Reset. ..............................................................................................................................................................................19

Remote-Reset............................................................................................................................................................................19

6.7.3. Restricted Earth Fault.......................................................................................................................................................................20

6.7.6. Serial Timeout..................................................................................................................................................................................20

6.7.7. Internal Error. ...................................................................................................................................................................................20

6.8. Trip History...............................................................................................................................................................................................21

6.9. Alarm History............................................................................................................................................................................................ 21

6.10. Last Five Faults. .....................................................................................................................................................................................21

6.11. Stats Info................................................................................................................................................................................................22

6.12. Calibration Menu. ...................................................................................................................................................................................22

6.13. Disturbance Recording (OPTIONAL). .....................................................................................................................................................23

7. Menu Tree Structure.........................................................................................................................................................................................24

8 MR-REF & MR-REF3 Setting Sheets.................................................................................................................................................................25

8.1. MR-REF & MR-REF3 System Settings Summary. .........................................................................................................................................25

REF & MR

REF3

Technical Manual

Issue 3, November 2013

8.2. MR-REF & MR-REF3 Control Setting Summary. ...........................................................................................................................................26

8.3. MR-REF & MR-REF3 Protection Setting Summary........................................................................................................................................27

8.4. MR-REF & MR-REF3 Blank Protection Setting Summary. ............................................................................................................................. 27

Appendix 1 ...........................................................................................................................................................................................................28

MR-REF – MR-REF3 Installation..........................................................................................................................................................................28

Appendix 2 ...........................................................................................................................................................................................................28

Termination Numbers MR-REF Version................................................................................................................................................................29

Appendix 3 ...........................................................................................................................................................................................................30

MR-REF Version Schematic Diagrams. ................................................................................................................................................................30

Version Appendix 4 ..............................................................................................................................................................................................31

Termination Numbers MR-REF3 Version..............................................................................................................................................................31

Appendix 5 ...........................................................................................................................................................................................................32

MR-REF3 Version Schematic Diagrams. ..............................................................................................................................................................32

Appendix 6 ...........................................................................................................................................................................................................33

Factory Default Procedure....................................................................................................................................................................................33

Appendix 7 ...........................................................................................................................................................................................................34

Handling Guidelines. ............................................................................................................................................................................................34

Page 1

REF & MR

REF3

Technical Manual

Issue 3, November 2013

1. P&B MR-REF & MR-REF3

P&B Protection Relay's MR-REF & MR-REF3 is a highly sophisticated microprocessor based feeder protection

relay, specifically designed to be used on low or medium voltage feeders as an integral part of any type or

manufacture of distribution equipment.

MR-REF & MR-REF3 monitors the earth current/s by means of conventional ring type current transformers with

typically 1A or 5A secondary outputs. This measured current is then used by the MR-REF & MR-REF3 to determine

tripping or alarm functions in order to interrupt the main switching device and protect the circuit or transformer from

damage.

The MR-REF & MR-REF3 is a withdrawable, easily installed package. The MR-REF & MR-REF3 with the 4 x relay

output option can be used as a replacement for older MREF relays by removing the relay module from the

switchgear mounted casing and fitting the new MR-REF & MR-REF3 in its place some wiring changes are required

to ensure compatibility.

All setting parameters are programmed independently for each unit via the integral keypad and liquid crystal display

on the front plate or via any of the communication ports and PC based software package available for the Vision

series of products.

During operational conditions the LCD also gives access to accurate load, statistical and fault data such as; Earth

Phase Amps, Time to Trip, In Service Hours, Number of operations.

Tri-Colour Light Emitting Diodes mounted on the front plate give immediate visual indication of the breaker status i.e.

HEALTHY / IRF / INHIBIT and ALARM / FAULTY / HEALTHY conditions.

The MR-REF & MR-REF3 can also be integrated onto an RS485 based network. This allows measured, statistical

and status information from the relay to be reported to a remote central communicating system.

Pages 25 to 27 can be used as a template for your relay settings schedule.

Page 2

REF & MR

REF3

Technical Manual

Issue 3, November 2013

1.1 Principle of operation

In the simple case above, for a current I

flowing through both CT’s will produce an equal secondary current. This

will flow around the loop and the voltage X-Y will remain zero and the MREF relay would not operate.

In the event of an internal (in zone) fault I

, only CT (A) would “see” this fault. The other CT (B) would appear as an

open circuit. Thus any secondary current in CT (A) would flow between X & Y operating the MREF.

In Practice, should this case become extremely large, one CT may saturate, in effect representing a shorted

secondary. In this case, the circulating current would produce a voltage across X/Y. Calculations must be made to

ensure stability under these circumstances, these are described in P&B application Note MR901

Unbiased Differential

Three MR-REF relays or one MR-REF3 are required to achieve full protection. Each with stabilizing resistors and

possibly a voltage dependent non-linear resistor.

Page 3

REF & MR

REF3

Technical Manual

Issue 3, November 2013

Restricted Earth Fault Protection for Transformers.

Application for 3 & 4 wire systems (System Earth at Switchboard)

Application for “5” wire systems (earth & Neutral connections both available at the transformer)

Page 4

REF & MR

REF3

Technical Manual

Issue 3, November 2013

1.2 Protective Functions.

Restricted Earth Fault Protection

Serial Timeout protection

Internal Error Protection

1.3 Displayed Feeder Data.

Restricted Earth Fault Current/s

No of Operations

Accumulated Current/s at Trip

Digital Input 1 Status

Digital Input 2 Status

Time to Trip

Healthy / Fault

Pick-up Phase

Alarm - Description - Pre-Alarm Values

Trip Description - Pre- Trip Values

1.4 Control Functions.

Via Hardwired inputs: Via Keypad Via Comms input:

Block, Reset Reset Reset

Page 5

REF & MR

REF3

Technical Manual

Issue 3, November 2013

2. Technical Specification.

Power Supply.

UXILIARY

OWER

UPPLY

OLTAGE

OWER

UPPLY

AC Nominal Range 80 – 265V AC / DC

Range 24V AC / 24-48V DC (Low Voltage Power Supply Optional Extra)

Frequency 45 - 65 Hz

Maximum Power Consumption 10VA, 15VA Nominal

Measurement.

ESTRICTED

ARTH

HASE

URRENT

EASUREMENT

Method True RMS, Sample time <1ms

Range 1.0 to 200% E/F CT Primary Amps

Full Scale 200% E/F CT Primary Amps Setting

Display Accuracy ±3% of Reading Over Range

Pick Up accuracy ±3% of setting

Protection Functions.

ARTH

AULT

IME

ELAY

Earth Fault Trip 0.05 sec. for less than 1 second

Total Run Time Accuracy ±2%

IME

ELAYS

Accuracy ±0.04 seconds

Exceptions

Earth Fault Trip +40mS,-0.0@ 1.1 x setting

+30mS,-0.0@ 2 x setting

+20mS,-0.0@ 5 x setting

Total Run Time Accuracy ±2%

Relay Contacts Ratings.

UTPUT

ELAYS

Rated Load 10A @ 250 AC

10A @ 30V DC

Maximum Breaking Voltage 250V AC

Max Making Current (max. 4s at duty cycle 10%) 35A

Max Breaking Capacity AC 2500VA

Max Breaking Capacity DC 600mA @ 110V DC

100mA @ 220V DC

Page 6

REF & MR

REF3

Technical Manual

Issue 3, November 2013

3. Environmental Tests.

CLIMATIC

EST STANDARD

EVERITY LEVEL

Temperature Dry Cold

Operational

IEC 60068-2-1 -20 deg C ,96 hrs

Temperature Dry Cold

Transportation & Storage

IEC 60068-2-1 -40 deg C , 96hrs

Temperature Dry Heat

Operational

IEC 60068-2-2 +60 deg C , 96 hrs

Temperature Dry Heat

Transportation & Storage

IEC 60068-2-2 +85 deg C , 96 hrs

Damp Heat

Steady State

IEC 60068-2-30 95% Non-condensing, Cyclic Test Db

Enclosure IEC 60529 front IP52 , rear IP00

MECHANICAL

Vibration IEC 60255-21-1 Class I

Shock & Bump IEC 60255-21-2 Class I

Seismic IEC 60255-21-3 Class I

ELECTRICAL

Insulation resistance IEC 60255-5 500 Vdc , 5 secs

Dielectric Test IEC 60255-5 Series C of table 1

2.5 kV 50Hz , 1 min

1.0 kV open contacts , 1 min

High Voltage Impulse IEC 60255-5 5 kV peak 1.2/50uS,0.5J

3 pos , 3 neg

Voltage Dips , Short

Interruptions & Voltage

variations immunity

IEC 60255-11

IEC 61000-4-11

3 dips & 3 interruptions at 10 sec intervals of duration between 10mS

and 500mS at zero crossings. Variations 40% &70%

Ripple in dc supply IEC 60255-11 12% ac ripple

VT input Thermal

Withstand

120% Vn , continuous

CT input Thermal

Withstand

250xIn half wave,100xIn for 1 second 30 xIn for 10 second ,

4 xIn cont.

ELECTROMAGNETIC COMPATIBILITY

Electrical fast

Transient/Burst

IEC 60255-22-4

IEC 61000-4-4

Class IV-4.0kv Power supply

Class IV -4.0 kV Other inputs

1 min each polarity

Oscillatory Waves

1 Mhz Burst

IEC 60255-22-1 Class III

Longitudinal 2.5 kV , 2sec

Transverse 1.0 kV , 2 sec

Electrostatic Discharge IEC 60255-22-2 Class IV

8kV contact 15kV air discharge , 10 discharges at 1 sec intervals

Conducted Disturbance

RF fields

IEC 61000-4-6 0.15 to 80 Mhz

Severity Level 10Vrms

+sweeps 0.05-0.15MHz & 80-100MHz

Radiated e-m field

from digital portable

telephones

ENV 50204 900 & 1890mhz at 10V/m

Radiated RF e-m field

immunity test

IEC 60255-22-3 ClassIII test method A

+sweep 500-1000mhz

or IEC 1000-4-3 80-1000mhz

severity 10V/m 80% modulated 1 kHz

Surge Immunity IEC 61000-4-5 4kV common mode

4kV differential mode , 1.2/50uS

Power Frequency

Magnetic Field

IEC 61000-4-8 1000A/m for 1 sec

100A/m for 1 minute

Pulse Magnetic Field IEC 61000-4-9 6.4/16uS , 1000A/m

Damped Oscillatory

Magnetic Field Immunity

IEC 61000-4-10 0.1 & 1.0 Mhz , 100A/m

Conducted & Radiated RF

Interference Emission

EN55022 or

EN55011or

EN50081-2

Class A interference limits

Power frequency

conducted immunity,

common mode

IEC 61000-4-16

IEC 60255-22-7

DC to 150kHz sweep test level 4

300V at 16 2/3 & 50/60Hz

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