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Page 19

MR-REF & MR-REF3 Technical Manual

Issue 3, November 2013

Function.

If a particular function is required for a protective use it should be selected and set to the required action.
If a particular function is not required it should be left disabled. The display will show DISABLED next to the function
name. If a function is disabled then the threshold level and trip times will not impact the activity of the relay.

Alarm.

An Alarm is considered as a high level function. If the function activates it will be recorded as part of the alarm
history and cause MR-REF & MR-REF3 to enter an alarm state; the alarm fault will be displayed in the main display
scroll page and the right hand LED will give an alarm indication (amber colour).
If an output relay is set as Alarm it will change state with the fault.

Trip.

A Trip is considered as a high level function. If the function activates it will be recorded as part of the trip history and
cause the MR-REF & MR-REF3 to enter a trip state; the fault will be displayed in the active faults page and the unit
will automatically display that page, the right hand LED will give a Trip indication (red colour).
If an output relay is set as Trip it will change state with the fault.

Block.

In order for block to operate the function must be configured and a digital input also assigned as block. When the
digital input is energised this will prevent the protective function from operating against breach of threshold and trip
time.

Reset.

The configuration of the reset allows that particular protection function to be cleared or reset to a healthy condition
providing the condition that caused the fault, alarm or inhibit has been removed.

Auto Reset.

This option, when enabled, automatically resets the fault when the situation that caused the trip has been removed.
If Auto Reset is selected the other reset options are not required.

Panel-Reset.

This option, when Enabled, allows a reset of a fault to be carried out from the front panel of the relay. A reset button
will be displayed in the top right hand corner of the main display scroll page, if any fault has been removed and is
enabled for a panel reset.

Serial-Reset.

This option, when Enabled, allows a reset of a fault to be carried out through the serial communication port of the
relay.

Remote-Reset.

This option, when Enabled, allows a reset of a fault to be carried out through a digital input to the relay. A digital
input must be set to Reset Faults and must be closed after the fault condition has been removed in order for the
reset to operate.

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Содержание MR-REF

Страница 1: ...MR REF MR REF3 Technical Manual Issue 3 November 2013 ...

Страница 2: ......

Страница 3: ...puts 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 Tim...

Страница 4: ...nk 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 ...

Страница 5: ...y 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 ser...

Страница 6: ...ld 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 applicat...

Страница 7: ... 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 ...

Страница 8: ...rotection 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 ...

Страница 9: ...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 EARTH FAULT TIME DELAY Earth Fault Trip 0 05 sec for less than 1 second Total Run Time Accuracy 2 TIME DELAYS 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 Con...

Страница 10: ...hermal 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 Cla...

Страница 11: ... at any time via the Display Scroll page of the relay this enables complete wire checking without the need to disconnect or even gain access to the rear panel wiring The source voltage for the digital inputs is derived from the auxiliary power supply when power is connected these terminals may be live 4 6 RS485 Rear Port The RS485 port utilises a half duplex RS485 protocol allowing up to 32 units ...

Страница 12: ... such as Lamps Ammeter Voltmeter Operations Counter etc Helping to reduce the overall cost of the panel and giving improved reliability by the reduction of separate components 5 1 LED Status The LED s operate as follows LED Colour Left Hand LED Feeder Status Right Hand LED Fault Status GREEN Healthy Healthy AMBER Inhibit Alarm RED IRF Fault Feeder Settings Y Top Two line LCD Display Selector butto...

Страница 13: ... system Any description in the LCD window appearing to the LEFT in CAPITALS can be selected using the left hand push button Any description in the LCD window appearing to the RIGHT in CAPITALS can be selected using the right hand push button Otherwise the bottom right hand portion of the LCD is reserved for displaying status messages such as ACTIVE FLT E F PKUP etc The centre push buttons are used...

Страница 14: ...at a faster rate flashing at approximately three times per second Should the threshold breach s clear before the alarm or trip timers have expired then the message will automatically clear and the LED will revert to its previous indication If a fault has occurred and subsequently cleared then providing a panel reset has been configured the reset prompt will appear in the lower portion of the displ...

Страница 15: ...imum and maximum values of the particular setting range The UP and DOWN arrow buttons are used to alter the value The Next function is used to skip along to the next character Save is pressed to store the new value and exit If an undesired value is inserted incorrectly use the Next button to skip past the last character to the left The Save option button now operates as a Discard to dump the new v...

Страница 16: ...485 serial communications port may be configured to operate using a slave implementation of Modbus RTU or P B s own protocol P B Standard RS485 Parity This setting allows the user to set the parity to match that of the host system on the serial link The options are Odd Even and None RS232 USB Baud Rate This setting allows the user to configure the baud rate for the front mounted RS232 USB port RS2...

Страница 17: ... Slow Scan or Full Read Data Electrical Engineering Data The configuration of Fast Scan is not necessary unless the MR REF MR REF3 in used in conjunction with the XCell unit Each Fast Scan number can be programmed to export important data when requested This number references an internal address in MR REF MR REF3 and allows configurable data mapping between units Max Scan Time This setting need on...

Страница 18: ...to reset MR REF MR REF3 Fault or Alarm conditions The Input can only perform a reset if the following conditions are met 1 The Protection Settings for the specific fault or alarm are set to allow remote resets 2 The condition that caused the Fault or Alarm to occur no longer exists Block The Block Input can be used to block assigned protection functions upon energising of the Digital Input Each pr...

Страница 19: ... Fail Safe If an output relay is assigned as Alarm FS then this relay will change state from energised to the de energised relay contact when triggered by any protection function that is configured to alarm Healthy If an output relay is assigned as Healthy then this relay will be in its energised state at all times while the unit reports the feeder as being healthy This relay will be de energised ...

Страница 20: ... retrieve the password are to either read the information via the serial link or execute a Configuration Reset on the relay to restore all of the factory defaults see appendix 6 Contrast and LCD Backlight These functions allow the user to change the display contrast and backlight levels Set Default Page Default Return Time Any of the display scroll data pages can be nominated as the default page a...

Страница 21: ...elay Chronovision When enabled allows the real time clock to be updated via the broadcast GPS sync signal from Chronovision Screen Saver and Screen Saver Time To help extend the life of the LCD we can power the display down if the application suits The screen will power down after the set time from the last key press The MR REF MR REF3 will still operate and can be remotely controlled via digital ...

Страница 22: ... Trip Enabled Alarm Trip Alarm Trip Enabled Block Block Enabled Alrm Blck Alarm Block Enabled Trip Blck Trip Block Enabled A T B Alarm Trip and Block Enabled The reset options are as follows Using the UP and DOWN keys the data can be changed to one of the following Panel Panel reset only Serial Serial reset only S P Serial or Panel reset Remote Remote reset only R P Remote or Panel reset R S Remot...

Страница 23: ...s set as Trip it will change state with the fault Block In order for block to operate the function must be configured and a digital input also assigned as block When the digital input is energised this will prevent the protective function from operating against breach of threshold and trip time Reset The configuration of the reset allows that particular protection function to be cleared or reset t...

Страница 24: ...primary breaking device Trip Level The earth fault level is set as a percentage of the EFCT Primary If the current rises and remains above the threshold level action is taken after the trip time has elapsed Trip Time The trip time is set to determine how long an earth fault condition can persist before the configured action is taken 6 7 6 Serial Timeout For a set period of inactivity on the rear c...

Страница 25: ... recent alarm Each event record contains the Alarm Cause the Alarm Time and Alarm Date The up and down pushbuttons allow each trip record to be scrolled through In the left hand corner of the LCD a letter R is shown this allows the reset deleting of individual alarm events To reset a particular event scroll through the available alarm records until the event you require is reached then press the l...

Страница 26: ... values for each of the analogue channels can be adjusted Auto calibration routines can also be performed Each unit is calibrated prior to dispatch and a signed test report is issued The user may however access these settings if required and re calibrate the device if deemed necessary To achieve this a unique password must be obtained from P B protection relays The serial number of the unit will b...

Страница 27: ...to eight traces can be recorded If set to the maximum with full resolution then each trace length can only be a maximum of 500ms each Trigger Selects the trigger source to begin recording On Trip On Pick up On DI Close or On Start Trigger Position Selects the trigger point pre and post fault 0 100 20 80 50 50 80 20 or 100 0 Resolution The resolution can be set to half allowing the full eight secon...

Страница 28: ...gger position Resolution Digital Input Digital Output Enable Overwrite Trace Time Clear Traces PROTECT SETTINGS DISPLAY SCROLL INITIAL MENU MENU CALIBRATION MENU I O SETTINGS SYSTEM SETTINGS DISTURBANCE RECORDER OPTIONAL Password Engineer Password Change Password Contrast LCD Backlight Set Default Page Default Return Time Time Sync Delay Software Ver Serial No Enable Disturbance Time Date Chronovi...

Страница 29: ...rity Even Odd None Even Serial Delay 1ms 20ms 1ms 1ms Fastscan 1 0 255 2 0 Fastscan 2 0 255 2 0 Fastscan 3 0 255 2 0 Max Scan Time 1 30s 1s 1s Feeder Settings EF CT Primary 1 5000A 1A 100A System Settings Password Enabled Disabled Disabled Engineering Password Enabled Disabled Enabled Change Password 5 Characters 6363 LCD Contrast LCD Backlight Default Return Time No Return Off 1 5min 1min No Retu...

Страница 30: ...ontrol Setting Summary Range Step Default User Setting Digital Inputs Dig_In 1 Not Used Reset Block Reset Fault Dig_In 2 Not Used Reset Block Block Input Relay Outputs Relay 1 Programmable Trip Relay 2 Programmable Alarm Relay 3 Programmable Healthy Relay 4 Programmable Internal Fail ...

Страница 31: ...et Variable Range Step 64 Restricted Earth Fault Trip Level Trip Time 1 200 0 04 0 5s 1 0 01s Serial Timeout Timeout In 1 120s 1s Internal Error 8 4 MR REF MR REF3 Blank Protection Setting Summary Selectable Fixed Trip Alarm Block Auto Panel Serial Remote ANSI No Protective Function Available Action Available Reset Variable User Settings 64 Restricted Earth Fault Trip Level Trip Time Serial Timeou...

Страница 32: ...Each terminal having 1x M4 screw type and 2x 4 8mm blade type complying BS5057 Wiring torque of M4 screw should not exceed 0 5 0 6 Nm The MR REF MR REF3 has been designed for installation on to open type panels for use on the flat surface of a type 1 enclosure and for installations where the ambient temperature does not exceed 60 0 C 178mm DOOR SWING 215 00 mm FITTED with 12mm M4 STUDS 34 00 mm AN...

Страница 33: ...Page 29 MR REF MR REF3 Technical Manual Issue 3 November 2013 Appendix 2 Termination Numbers MR REF Version ...

Страница 34: ...l Manual Issue 3 November 2013 Appendix 3 MR REF Version Schematic Diagrams Conventional Protection Class Ring Type Current Transformer of 1A or 5A Secondary rating are common and can be connected directly to the CT inputs of MR REF ...

Страница 35: ...Page 31 MR REF MR REF3 Technical Manual Issue 3 November 2013 Version Appendix 4 Termination Numbers MR REF3 Version ...

Страница 36: ... Manual Issue 3 November 2013 Appendix 5 MR REF3 Version Schematic Diagrams Conventional Protection Class Ring Type Current Transformer of 1A or 5A Secondary rating are common and can be connected directly to the CT inputs of MR REF3 ...

Страница 37: ...it back up and the below should be shown on the display to indicate the default values have been installed This is useful if the engineering password has been disabled and password has been enabled and changed from the default password to an alternative which has been forgotten By defaulting the relay this will re enable the engineering password and disabled the password option as well as setting ...

Страница 38: ...be checked prior to reinstating the product in service If unsure contact P B for advice Disposal P B are committed to manufacturing practices which do not result in pollution or cause damage to the environment As the MR REF MR REF3 contains a non rechargeable battery we would recommend safe disposal of equipment at the end of its life inline with local laws If you wish us to dispose of equipment o...

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