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P&B MRAR Manual

Auto reclosing relay
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MRAR - Auto Reclosing Relay
P&B Engineering
Belle Vue Works
Boundary Street
Manchester
M12 5NG
Tel:
0161 230 6363
Fax:
0161 230 6464
21/07/2010
MRAR
MODEL
MRI-IDS
SERIAL NO. =
OK
RUN
LO
O
I
P&B
MA
ML
RS
CB
SHOT
No.
tf
tD2
tD4
tD1
tD3
tC1
tR
No M
No L
In =
Vx =
A
Vn =
V Fn =
50/60
PB
1
SELECT
RESET
VALUE
VALUE
ENTER
TRIP
PH
V
Hz
P&B Engineering
12-14 Crompton Way
Crawley
West Sussex
RH10 2QR
Tel:
Fax:
01293 524204
01293 534617
MRAR 01/96 C

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  • Page 1 MRAR - Auto Reclosing Relay MRAR MODEL MRI-IDS SERIAL NO. = SELECT P&B RESET VALUE SHOT VALUE ENTER No M No L TRIP In = Vx = Vn = V Fn = 50/60 P&B Engineering P&B Engineering Belle Vue Works...

  • Page 2: Table Of Contents

    5.5.1 Blocking..................................16 5.5.2 Cancellation of Blocking ..............................16 5.6 Circuit Example - Connection Diagram of the MRAR and MRI Together ..............17 5.7.1 Two Times AR Programming of the Unit, At Second Attempt Successful..............18 5.7.2 Two Time Programming of the Unit, Reclosing Unsuccessful..................19 5.7.3 Manual Switching On of the Circuit Breaker to Faulty Lines ..................19...
  • Page 3 8.4 System data..................................23 8.5 Power supply ...................................24 9 Housing ....................................25 9.1 Connection Details ................................26 10. Order Form ..................................27 21/07/2010 MRAR 01/96 C...

  • Page 4: Introduction

    - Overcurrent Relay (Independent time/I.D.M.T + earth + directional facilities) MRI-V - Voltage Dependent Overcurrent Relay MREF - Restricted Earth Fault Relay MRAR - Auto-Reclosing Relay MRMF - Mains Failure Relay MRVT - Voltage Protection MRFT - Frequency Protection...

  • Page 5: Application

    The MRAR digital auto-closing relay is a universal device suitable for a number of reclosing schemes. A very wide range of applications may be encompassed when the MRAR is combined with other relays from the MR range (eg. the MRI-I & MRCS).

  • Page 6: Design

    28. Protection Energised (21) When protection is energised, e.g. from over current time protection, a fault timer is started. The MRAR relay changes from a "Ready" status to a "Starting" status. (see also para 4.3.4).

  • Page 7: Output Relays

    All the listed inputs have the common point connection L- or N. 4.1.2 Output Relays The MRAR has 5 output relays. One relay with two change-over contacts for tripping and other four with a single change-over contact are used for siginalling: Switch on command to the circuit breaker (31, 29, 33, 32, 30, 34) •...

  • Page 8: Status Led's

    No→L - Green, Number of reclosing attempts until Maintenance Lockout 4.2.3 Remote data communication As an option, the MRAR may have an RS485 interface for remote data communication with a control centre. The unit provides the following information: Status signals •...
  • Page 9 1 to 200 <SELECT>, No→M Green Maintenance Alarm, No→M <∧>,<∨> AR attempts until 1 to 200 <SELECT>, No→L Green Maintenance Lockout, No→L <∧>,<∨> Number of carried out AR 1 to 200 <SELECT>, No Red attempts <∧>,<∨> 21/07/2010 MRAR 01/96 C...

  • Page 10: Push Buttons

    The <TRIP> push button is used to test the output relay circuits, both for tripping and signalling. This operation is also password protected. 4.3 Code jumpers Behind the front panel of the MRAR are three code jumpers used to preset the following functions: Password programming • • • •...

  • Page 11: Password Programming

    After the new password has been given, the relay module is extracted from its case and code jumper J1 removed. 4.3.2 Alarm and Trip relay function The following functions of the MRAR alarm relays may be preset using jumpers J1 & J2: Alarm relay activation upon initiation or after a trip • • • •...

  • Page 12: Working Principles

    5. Working Principles 5.1 Status Descriptions For the illustration of the functional sequence the MRAR defines six conditions: 5.1.1 Inactive The relay is in the inactive state when the following conditions are fulfilled: The circuit breaker is in the OFF position •...

  • Page 13: Ar Blocked

    Signal = No Transition Possible From the above table it is possible to determine which status transitions are possible with the MRAR. When the unit for instance is in the Cycle State, only two transitions are possible: Transition to the Ready state when reclosing has been successful.

  • Page 14: Functional Sequence

    5.3.1 Switching on the MRAR Relay If the circuit breaker to be supervised is in the off position while switching on the MRAR, the unit changes to the Inactive state when applying the auxiliary voltage. The OK LED on the front panel is not lit and the unit is not ready for auto reclosing.

  • Page 15: Successful Reclosing

    <SELECT/RESET> button for 5 seconds. 5.3.7 Repeated Reclosing If the MRAR is programmed for more than single shot reclosing a second Dead Time is started after a new OFF signal to the circuit breaker. After this period a new switch on command follows.

  • Page 16: Blocking And Cancellation Of Blocking

    23) The preset number of reclosings for the maintenance lockout has been reached. • When the reclosing shot is set to zero, the MRAR can also be blocked at site. • 5.5.2 Cancellation of Blocking The maintenance lockout is cancelled by resetting the AR value (No) to zero. All other blocking inputs can only be cancelled through the external reset input, terminal 25.

  • Page 17: Circuit Example - Connection Diagram Of The Mrar And Mri Together

    5.6 Circuit Example - Connection Diagram of the MRAR and MRI Together 21/07/2010 MRAR 01/96 C...

  • Page 18: Two Times Ar Programming Of The Unit, At Second Attempt Successful

    As a short circuit occurs the circuit breaker is switched off by the protecting device and the dead time counter in the MRAR starts to time out. After this dead time, tD1, has elapsed the MRAR gives the reclosing command to the circuit breaker. If the fault still exists then the breaker will be tripped again by the protection device and the above mentioned procedure is repeated until the fault is removed or the number of set shots is reached, in the above case two.

  • Page 19: Two Time Programming Of The Unit, Reclosing Unsuccessful

    2 = Protection Tripped The MRAR is in the inactive state when the circuit breaker is switched off. When the circuit breaker is manually switched on, the reclaim time is started. Should there be a fault on the line during the switch on procedure, the circuit breaker is switched off again via the protection device and the reclaim time is stopped.

  • Page 20: Operation And Adjustment

    Close Impulse Time (tC1) During the Close Impulse Time, the switch on contact of the MRAR is closed. It starts with the timing out of the dead time but can be interrupted if the switch on feed back from the circuit breaker exists before the dead time has elapsed.

  • Page 21: Testing

    7. Testing Please note that these tests are not intended to give detailed information of the type tests carried out on the MRAR but are function tests only. 7.1 Power On Switch on the auxiliary supply to the unit, terminals 1 and 2, and check that the message "P&B" appears on the display and that the self supervision alarm relay is energised, terminals 49 and 51 are closed.

  • Page 22: Technical Data

    8. Technical Data MRAR - Auto Reclosing Relay 8.1 Input Circuits Circuit Opto-electronic Coupler - Isolated inputs (N/O Current circuit) Inputs Circuit Breaker Status (28-15) Trip Protection (27-15) Start Protection (21-15) Circuit Breaker Energy (22-15) Synchronous Check (23-15) External Block...

  • Page 23: System Data

    Isolation Test = 2.5kV / 50Hz / 1 min. Impulse Test = 5kV, 1.2 / 50mS, 0.5J High frequency interference Test = 2.5kV / 1MHz Burst transient Test = 4kV / 2.5KHz, 15mS ESD Test = 8kV 21/07/2010 MRAR 01/96 C...

  • Page 24: Power Supply

    Vaux = 24V in a range from 16V to 60V AC in a range from 16V to 80V DC Vaux = 110V in a range from 50V to 270V AC in a range from 70V to 360V DC 21/07/2010 MRAR 01/96 C...

  • Page 25: Housing

    CT overvoltages. A clear plastic front cover is provided for inspection purposes. MRAR units are supplied in standard height (179mm≅7in.) cases, complying with IEC 297 size 4U. The rigid case wall is manufactured from a single sheet of hot dipped galvanised steel coated externally with Plastisol PVC and internally with a low gloss alkyd paint finish.

  • Page 26: Connection Details

    2 push-on blade type connectors 1 ring type connector & 1 push-on blade type connector Earth Each terminal 1 screw & 2 spade Rear terminal block connections. All information subject to change without notice Publication number MRAR 01/96 C 21/07/2010 MRAR 01/96 C...

  • Page 27: Order Form

    * Range 16-60V ac, 16-80Vdc for 24V device 50-270V ac, 70-360Vdc for 110V device Non-standard voltages available on request PBSI Ltd Trading as P&B ENGINEERING Bell Vue Works, Boundary Street, Manchester. Tel: 0161-230-6363 M12 5NG. Tel: 0161-230-6464 21/07/2010 MRAR 01/96 C...

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