P&B MRAR Manuel utilisateur

21/07/2010 1 MRAR 01/96 C

MRAR - Auto Reclosing Relay

SELECT

RESET

VALUE

ENTER

TRIP

P&B

RSMLMA

In =

Vn =

VFn = 50/60 Hz

VPH

Vx =

MRAR

MODEL

SERIAL NO. =

No.

SHOT

tD2

tD1 tD4

tD3

tC1

MRI-IDS

OLORUNOK I

No M

No L

P&B Engineering P&B Engineering

Belle Vue Works 12-14 Crompton Way

Boundary Street Crawley

Manchester West Sussex

M12 5NG RH10 2QR

Tel: 0161 230 6363 Tel: 01293 524204

Fax: 0161 230 6464 Fax: 01293 534617

21/07/2010 2 MRAR 01/96 C

Contents

1. Introduction .........................................................................................................................................................................4

2. Application ..........................................................................................................................................................................5

3. Features and characteristics .................................................................................................................................................5

4. Design..................................................................................................................................................................................6

4.1 Circuit Diagram ................................................................................................................................................................6

4.1.1 Information Inputs .......................................................................................................................................................... 6

4.1.2 Output Relays .................................................................................................................................................................7

4.2 LED's ................................................................................................................................................................................. 7

4.2.1 Status LED's ...................................................................................................................................................................8

4.2.2 Adjusting LED's..............................................................................................................................................................8

4.2.3 Remote data communication...........................................................................................................................................8

4.2.4 Push buttons .................................................................................................................................................................10

4.3 Code jumpers...................................................................................................................................................................10

4.3.1 Password programming ...............................................................................................................................................11

4.3.2 Alarm and Trip relay function ...................................................................................................................................... 11

5. Working Principles............................................................................................................................................................ 12

5.1 Status Descriptions..........................................................................................................................................................12

5.1.1 Inactive .........................................................................................................................................................................12

5.1.2 Reclaim Time ................................................................................................................................................................ 12

5.1.3 AR Ready ......................................................................................................................................................................12

5.1.4 AR Starting ...................................................................................................................................................................12

5.1.5 AR Cycle .......................................................................................................................................................................12

5.1.5 AR Blocked ...................................................................................................................................................................12

5.2 Description of Status Transition......................................................................................................................................13

5.3 Functional Sequence........................................................................................................................................................14

5.3.1 Switching on the MRAR Relay......................................................................................................................................14

5.3.2 Switching on the Circuit Breaker Manually .................................................................................................................14

5.3.3 Switching off the Circuit Breaker Manually ................................................................................................................. 14

5.3.4 Starting Auto-Reclosing................................................................................................................................................14

5.3.5 Reclosing Without Success ...........................................................................................................................................14

5.3.6 Successful Reclosing.....................................................................................................................................................15

5.3.7 Repeated Reclosing.......................................................................................................................................................15

5.3.8 External Blocking and Reseting....................................................................................................................................15

5.3.9 Supervision of the Circuit Breaker Ready Information ................................................................................................15

5.4 Operation and Release of the Output Relays...................................................................................................................15

5.5 Blocking and Cancellation of Blocking ...........................................................................................................................16

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

6. Operation and Adjustment.................................................................................................................................................20

6.1 Definition of Setting Values............................................................................................................................................. 20

6.2 The AR Counter ...............................................................................................................................................................20

7. Testing ...............................................................................................................................................................................21

7.1 Power On.........................................................................................................................................................................21

7.2 Output Relay Tests........................................................................................................................................................... 21

7.3 Checking the Set Values .................................................................................................................................................. 21

7.4 Checking the CB Status Input Circuit (28-15).................................................................................................................21

7.5 Checking the External Block Input Circuit (24-15)......................................................................................................... 21

7.6 Checking the External Reset Input Circuit (25-15) ......................................................................................................... 21

8. Technical Data...................................................................................................................................................................22

8.1 Input Circuits...................................................................................................................................................................22

8.2 Output Relays ..................................................................................................................................................................22

8.3 Setting Ranges and Steps.................................................................................................................................................22

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8.4 System data......................................................................................................................................................................23

8.5 Power supply ...................................................................................................................................................................24

9 Housing ..............................................................................................................................................................................25

9.1 Connection Details .......................................................................................................................................................... 26

10. Order Form ...................................................................................................................................................................... 27

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1. Introduction

The application of powerful microprocessors opens a new chapter for power system protective relaying.

The digital processing of measured values and the ability to perform complex arithmetic and logic

operations, give digital protection relays significant performance and flexibility improvements over their

traditional analogue counterparts. Additional advantages - very small power consumption, adaptability,

self-supervision, fault diagnosis through fault data recording, smaller physical construction and

selectable relay characteristics - all combine to allow the implementation of accurate and highly reliable

protection schemes at a significantly reduced financial burden.

The development of microprocessor based protective relays and their introduction into the market has

been stimulated by the recent trend to replace analogue with digital equipment. This modern trend has

prompted the development of a new P&B protective relay family - the MR relay series. This

comprehensive family of protection relays can satisfy the demands of even the most complex protection

schemes:

MRI - 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

MROS - Vector Surge or Rate of Change of Frequency

MRNS - Negative Sequence Relay

MRRP - Power Relay

MRCS - Check Synchronising Relay

MRFF - Field Failure Relay

MRDG - Differential Relay

The superiority of digital protective relaying over traditional analogue devices, as embodied by the MR

relay family, is summarised by the following features:

•

••

•Integration of many protective functions in a single compact case

•

••

•High accuracy owing to digital processing

•

••

•Digital relay setting with very wide setting ranges and fine setting steps

•

••

•Comfortable setting procedure through extensive human - relay dialogue

•

••

•Measured values and fault data indication by means of alpha-numeric display

•

••

•Data exchange with DCS/SCADA by means of RS485

•

••

•Operational reliability through self-supervision

A similar but simplified range, with reduced functions and without display, is also available. The MIRI

- overcurrent and earth fault relays, and the MIRV - undervoltage, overvoltage and neutral voltage

displacement relays. To complement the MR series, a range of Auxiliary, Timing and Tripping devices

are also available.

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2. Application

In transmission line networks about 70% of the occuring failures are transient; arcing, tree branches on

power lines etc. With the use of auto-reclosing techniques it is possible to "switch off" the supply until

these faults have been removed. Without utilzing auto-reclosing techniques, consumer interuptions

occur frequently which is unfortunate especially as the vast majority of faults have been removed a short

time after the initial outage.

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).

The protective functions of the MRAR are summarised as follows:

•Independent adjustable time ranges.

•Four digit counter for display of the completed auto-reclosing.

•High-Set blocking output available

•External blocking and release.

•Suitable for use with a number of IDMT devices.

•Maintenance Alarm and Lock-out.

•Suitable for generator and similar applications requiring a check-sync function.

3. Features and characteristics

•Complete digital processing of all logic inputs

•Extremely wide setting ranges with fine setting steps

•Unauthorised user access control through password protection

•User defined password

•Continuous self-supervision of software and hardware

•Outstanding design flexibility for easy selection of appropriate operational scheme for

numerous applications

•Serial data communication facilities via RS485

•Wide voltage range for DC or AC power supply

•Withdrawable modules

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4. Design

4.1 Circuit Diagram

Supply

Reserve

External Reset

External Block

Sync. Check

CB Energy

Start Protection

Trip Protection

CB Status

Supply

POWER

SUPPLY

1 2 CASE

Supply

MRAR

54 5553

External Reset Blocking Input

L N L

CLOSE CB 33

7910

SELF SUPERVISION

AR BLOCKED

AR IN PROGRESS

HIGH SET BLOCK

RS485

Note: Terminals 1 and 2, and inputs 21 - 28 and 15 are not to be tested by the application of a high

voltage power frequency input ("flash tested"), as this will cause damage to the unit.

Explanation of the Circuit Diagram

4.1.1 Information Inputs

Using the information inputs the MRAR relay decides whether and when auto-reclosing will take place.

Circuit Breaker Status (28)

With input terminal 28, the position of the circuit breaker can be supervised. When the circuit breaker is

closed, mains supply uninterrupted, the auxiliary voltage is connected to terminal 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).

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Protection Trip (27)

When a tripping command occurs from the protection before the fault timer has expired, the unit

changes from the "Starting" status to the "Cycle" status switching the circuit breaker to off. (see also

para 4.3.4).

Circuit Breaker Energy (22)

Because the circuit breaker needs a certain time between two reclosings in order to trip again, the ready

signal of the circuit breaker; auxiliary voltage at terminal 22; is checked before a new reclosing can take

place. (see also para 4.3.9).

Synchronism Check (23)

In order to prevent a reclosing of the unit at an asynchronous phase position, input 23 is connected to a

synchronising unit. If no synchronous control is necessary, the auxiliary voltage is applied to terminal

23.

External Blocking (24) and External Reset (25)

The unit is blocked when applying voltage to terminal 24. This blocking can only be removed by

applying the auxiliary volatge to terminal 25. Blocking has priority during the simultaneous activation

of inputs 24 and 25.

Reserve (26)

This input is not used at this time.

Common Point (15)

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)

•

••

•Blocking of the high set trip (38, 36, 40)

•

••

•Signal "AR in Progress" (43, 41, 45)

•

••

•Signal "AR Blocked" (47, 49, 51)

•

••

•Signal "Self-supervision" (50, 48, 52)

4.2 LED's

The front panel consists of five push buttons for control and adjustment and twenty LED's for

indication. The LED's on the left hand side next to the display indicate the status, error messages and

AR results. The LED's on the left under the status LED's are provided for adjustments, their functions

are shown by the legend next to the LED.

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Front Panel

SELECT

RESET

VALUE

ENTER

TRIP

P&B

RSMLMA

In =

Vn =

VFn = 50/60 Hz

VPH

Vx =

MRAR

MODEL

SERIAL NO. =

No.

SHOT

tD2

tD1 tD4

tD3

tC1

MRI-IDS

OLORUNOK I

No M

No L

4.2.1 Status LED's

OK - Green, Unit ready for operation;

extinguished unit inactive.

RUN - Red, AR in progress

LO - Green, AR Locked Out

O→I - Green, AR successful; Red, AR

Unsuccessful

CB - Red, Circuit Breaker Fault

MA - Yellow, Maintenance Alarm

ML - Yellow, Maintenance Lockout

RS - Yellow, Remote Data

Transmission

4.2.2 Adjusting LED's

SHOT - Green, Number of reclosing attempts

No- Red, Number of AR's carried out

tf - Green, Fault Time

tD1 - Green, Dead Time for the first reclosing

tD2 - Red, Dead Time for the second reclosing

tD3 - Green, Dead Time for the third reclosing

tD4 - Red, Dead Time for the fourth reclosing

tC1 - Green, Close Impulse Time

tr - Green, Reclaim Time

No→M- Green, Number of reclosing attempts until Maintenance Alarm

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

•Relay settings

•Self supervision alarm signal

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Table: Adjustment Possibilities by Means of the Display

Function Display Shows Push button Illuminated LED

Normal Operation P&B

Program Version Version Number <TRIP> x 2

Password Inquire PSW? <ENTER> <TRIP>

Wrong Password NO!

Save Parameter SAV? <ENTER>

Saved Parameter SAV! <ENTER>

Test Output Relays TRI? <TRIP>

Relay Trip Testing TRIP <TRIP>

End of Trip Test END!

Reclosing Successful Clos O→I Green

Reclosing Unsuccessful Open O→I Red

No CB On signal after a

switch ON

CB!! O→I Red, CB Red

LO Red

No CB Off signal after

protection OFF

CB?? CB Red

Dead Time closing conditions

not met

S/E? O→I Red

Switch was manually

switched off during Reclaim

Time

Manu

Password **** combination of

<SELECT>,

<∧>,<∨>,

<ENTER>

Number of AR Attempts 0 to 4 <SELECT>,

<∧>,<∨>

SHOT Green

Fault Time, tf Time in seconds <SELECT>,

<∧>,<∨>

tf Green

Dead Time for AR Ateempts

tD1 to tD4

Time in seconds <SELECT>,

<∧>,<∨>

tD1 - tD4 Green/Red

Close Impulse Time, tC1 Time in seconds <SELECT>,

<∧>,<∨>

tC1 Green

Reclaim Time, tr Time in seconds <SELECT>,

<∧>,<∨>

tr Green

AR attempts until

Maintenance Alarm, No→M

1 to 200 <SELECT>,

<∧>,<∨>

No→M Green

AR attempts until

Maintenance Lockout, No→L

1 to 200 <SELECT>,

<∧>,<∨>

No→L Green

Number of carried out AR

attempts

1 to 200 <SELECT>,

<∧>,<∨>

No Red

21/07/2010 10 MRAR 01/96 C

4.2.4 Push buttons

The front panel contains five push buttons used for setting, measuring and other user functions.

The individual setting and measuring values can be selected in turn by pressing the <SELECT> /

<RESET> push button. This button also resets the relay if pressed for approximately 3 seconds.

The <UP> and <DOWN> push buttons are for incrementing and decrementing any selected parameter.

Continuous pressing of these push buttons will cause the parameter to change at an increased rate.

The <ENTER> push button is used to transfer the indicated value to the internal parameter memory. An

unintended or unauthorised change of the selected parameter can be avoided through the password

protection facility.

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

•

••

•Alarm and Trip relay functions

The following figure shows the position and designation of the code jumpers

J3 J2 J1

Code Jumper ON

Code Jumper OFF

Front Board

Code Jumper

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