ABB REA 105 Manuel utilisateur

REA 105

Arc Protection Module

Operator’s Manual

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REA 105

Issued: 20.04.1998

Version: C/01.07.2002

Checked: HS

Approved: RH

We reserve the right to change data without prior notice.

Arc Protection Module

Operator’s Manual

Contents:

1. General ................................................................................................4

1.1. Features ........................................................................................4

2. Safety ...................................................................................................5

3. Block diagram .....................................................................................6

4. Description of operation ....................................................................7

4.1. Light detection ...............................................................................7

4.2. Trip output .....................................................................................7

4.3. Operation of IN1 and OUT1 ports .................................................8

4.4. Operation of port IN2 .....................................................................8

4.5. Circuit-breaker failure protection ...................................................8

4.6. Self-supervision unit (IRF) .............................................................9

4.7. Front panel ....................................................................................9

4.8. Functions of LEDs and switches .................................................10

5. Connections ......................................................................................12

6. Commissioning .................................................................................13

6.1. Instructions for commissioning: ...................................................13

6.2. Testing of arc protection system level .........................................13

6.3. Light reference setting .................................................................14

7. Dimensions and fixing .....................................................................15

8. Technical data ...........................................................................16

9. Order information ....................................................................18

10.References ..............................................................................20

1MRS 751005-MUM

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1MRS 751005-MUM

Arc Protection Module

Operator’s Manual

REA 105

1. General

REA 105 is an extension unit designed to be used together with the arc protection

relay REA 101. The function of the unit is to detect light and to carry out tripping,

if the REA 101 unit provides an overcurrent signal at the same time, or delivers a

trip command.

The use of extension units allows the protection area to be extended and the

protected object to be divided into smaller areas. Thus a more selective system is

obtained.

1.1. Features

• Loop-type or radial sensor fibre for arc detection.

• 2 high-speed semi-conductor outputs for tripping.

• Signal relay activated by light detected by the sensor fibre.

• 3 RJ-45 ports for the connection of REA 101 relay and extension units.

• Circuit-breaker failure protection. Delayed light signal to REA 101, which opens

the higher-level circuit breaker.

• Self-supervision unit monitoring operating voltages and the sensor fibre loop.

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1MRS 751005-MUM Arc Protection Module

Operator’s Manual

REA 105

2. Safety

National and local electrical safety regulations must always be

followed.

Dangerous voltages can occur on the connectors, even though the

auxiliary voltage is disconnected.

The frame of the device has to be carefully earthed.

Only a competent electrician is allowed to carry out the electrical

installation.

Sensor fibres have to be handled according to the instructions given by

the sensor fibre manufacturer.

Settings and configuration changes have to be done with the auxiliary

supply voltage (Uaux) disconnected. Malfunction may occur if changes

are made with the supply voltage connected.

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1MRS 751005-MUM

Arc Protection Module

Operator’s Manual

REA 105

3. Block diagram

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HSO1HSO2

sensor 1

SG1/ 1

SG1/ 2

SG1/ 3SG1/ 4

SG1/ 5

SG1/ 7

SG1/ 6

SG1/ 8

X4 1 2 3 6 7 9 10

PORT

IN 1

PORT

IN 2

PORT

OUT 1

rip

ligh

Power

OUT

loh5a

Circui -

breaker

failure

pro ec ion

Ligh de ec ion

and es ing

Cable

connec ion

block

Cable

connec ion

block

HSO1HSO2

sensor 1

SG1/ 1

SG1/ 2

SG1/ 3SG1/ 4

SG1/ 5

SG1/ 7

SG1/ 6

SG1/ 8

X4 1 2 3 6 7 9 10

PORT

IN 1

PORT

IN 2

PORT

OUT 1

tr p

l ght

Power

OUT

loh5a

³1

C rcu t-

breaker

fa lure

protect on

L ght detect on

and test ng

Cable

connect on

block

Cable

connect on

block

HSO1HSO2

sensor 1

SG1/ 1

SG1/ 2

SG1/ 3SG1/ 4

SG1/ 5

SG1/ 7

SG1/ 6

SG1/ 8

X4 1 2 3 6 7 9 10

PORT

IN 1

PORT

IN 2

PORT

OUT 1

tr p

l ght

Power

OUT

loh5a

³1

C rcu t-

breaker

fa lure

protect on

L ght detect on

and test ng

Cable

connect on

block

Cable

connect on

block

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1MRS 751005-MUM Arc Protection Module

Operator’s Manual

REA 105

4. Description of operation

4.1. Light detection

The switch SG1/4 (Sensor ON/OFF) is used for selecting the sensor fibre.

The light captured by the sensor fibre is amplified and compared either to an

automatic or a manual reference level. Once the reference level has been exceeded,

a light signal is generated and the signal relay (Light) is activated for about 0.5

second. In a trip situation, the central unit REA 101 or the REA 105 unit itself

provides information about the tripping, and the signal relay is locked in the active

state. If no tripping occurs, the relay resets.

The SG1/3 switch (Automatic light ref. level ON/OFF) is used for selecting the

automatic or manual reference level. The unit itself forms the automatic reference

level according to the present backlight intensity measured by the sensor fibre. The

potentiometer “Light Ref. Level Adj.”on the front panel is used for setting the

manual reference level.

The sensor fibre is monitored by sending a test pulse through the fibre. Unless the

test pulse is received at regular time intervals at the other end of the loop, the sensor

fault LED “Fault”and the IRF indicator LED “IRF”are activated.

Condition monitoring of the sensor fibre can be deactivated with the switch SG1/8

(Sensor supervision deactivation ON/OFF), in which case a radial, i.e. a terminating,

fibre can be used.

When the switch SG1/5 (Light to port IN1 ON/OFF) is in the OFF position, no light

signalis transmitted tothe REA 101 unit located in the direction of the port IN1, and

the REA 105 extension unit alone carries out tripping if the REA 101 unit delivers

an overcurrent signal at the same time.

When the switch SG1/5 is in the ON position, the light signal is transmitted to the

centralunit REA 101. BoththeREA 105 and the REA 101 unit trip ifthe overcurrent

signal is active.

Delayed tripping by REA 101 is explained in section “Circuit-breaker failure

protection”.

The REA 105 unit does not send a light signal to the port IN2.

4.2. Trip output

The trip outputcontains two high-speed,galvanically isolated IGBT semi-conductor

outputs (HSO1 and HSO2). These outputs can be used in DC and AC circuits. The

control signal of the outputs is activated if the unit detects light and the central unit

REA 101 delivers an overcurrent signal, provided the operating voltage fault signal

is inactive.

Once the central unit REA 101 performs tripping, all the REA 105 extension units

connected to it trip as well. When the REA 105 trips, the outputs remain in the active

state.

The outputs are reset by pressing the Reset push-button or via the RESET input of

the central unit.

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1MRS 751005-MUM

Arc Protection Module

Operator’s Manual

REA 105

4.3. Operation of IN1 and OUT1 ports

The ports IN1 and OUT1 are connected in parallel. The connection cable from the

central unit REA 101 is connected to the port IN1 and the connection cable to the

next extension unitdepartsfrom the port OUT1. Amaximum offiveextensionunits,

one after the other, can be linked to one port of the central unit.

The terminator of the last extension unit has to be connected using the switch SG1/

1: Terminator 1 ON/OFF. This allows the REA 101 unit to monitor the condition of

the connection cable.

Should the terminator be unconnected, the fault indicating LED “Port A/B Fault”of

the central unit REA 101 and the IRF indicator LED “IRF”are activated, and the

IRF relay resets. The REA 105 extension unit gets the operating voltage over the

port IN1.

4.4. Operation of port IN2

Port IN2 is used when the ports of two REA 101 units are to be connected together,

for instance, for the transfer of overcurrent signals. (See sections “Functions of

LEDs and switches”and “Application examples”of the REA 101 Operator’s

manual 1MRS 751003-MUM.

In this case, the ports must be terminated, that is, the terminators for both ports IN1

and IN2 have to be connected (switches SG1/1-2).

The port is galvanically isolated from the rest of the device, because otherwise

possible potential differences between the central units might cause problems.

4.5. Circuit-breaker failure protection

The circuit-breaker failure protection is implemented by delaying the light signal

that is transmitted to the bus via the IN1 port.

The switch SG1/6 (Delayed light to port IN1 ON/OFF) is used to activate the circuit-

breaker failure protection.

When the circuit-breaker failure protection is in use, the switch SG1/5 (Light to port

IN1 ON/OFF) has to be in the OFF position.

The desired delay time, 100 ms or 150 ms, is selected with the switch SG1/7 (Delay

ON = 150 ms, OFF = 100 ms). Once the REA 105 unit trips, the delay time starts

running. If the overcurrent signal is active when the delay time runs out, the REA

105 extension unit transfers a light signal to the port IN1 and delayed tripping will

be carried out by the REA 101 unit.

Should the overcurrent signal disappear during the time delay, no light signal will

be transmitted by the REA 105 unit, and no delayed tripping will be performed by

the REA 101 relay.

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1MRS 751005-MUM Arc Protection Module

Operator’s Manual

REA 105

4.6. Self-supervision unit (IRF)

In addition to thatmentioned above, the self-supervision unitmonitors the operating

voltages of the device. If a fault is detected in the operating voltages, the self-

supervision unit prevents the device from operating. When the LED indicator “IRF”

of the REA 105 unit is lit, the LED “Port A/B Fault”of the REA 101 relay starts

flashing, the LED indicator “IRF”is activated and the IRF relay resets.

4.7. Front panel

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REA 105

ARC PROTECTION

ABB Ne work Par ner

IRF Uaux

1MRS090418-AA

Ser. No

OFF

8 = Sensor supervision deac iva ion ON/OFF

3 = Au oma ic ligh ref level ON/OFF

Ligh

Faul

OUT

Sensor

4 = Sensor ON/OFF

1 = Termina or 1 ON/OFF

SG1

Ligh ref.

level adj.

MAX

MIN

paneli5

TRIP

2 = Termina or 2 ON/OFF

5 = Ligh o por IN1 ON/OFF

6 = Delayed ligh o por IN1 ON/OFF

7 = Delay ON = 150 ms, OFF = 100 ms

967

HSO1

Por

IN2

Por

OUT1

Por

IN1

123

Ligh

HSO2

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1MRS 751005-MUM

Arc Protection Module

Operator’s Manual

REA 105

4.8. Functions of LEDs and switches

Light Ref. Level Adj.:

Potentiometer for manual backlight compensation:

- potentiometer in use, if switch SG1/3 in OFF position.

- potentiometer not in use, if switch SG1/3 in ON position.

LEDs activated:

Uaux Power supply is connected

Light The sensor fibre has detected light

TRIP The unit has tripped

IRF The self-supervision system has detected a fault

(The fault LED Port A/B Fault of the REA 101 relay is flashing, the IRF

indicator is lit, and the IRF relay has reset)

Fault + IRF Sensor fibre broken

(The sensor fibre may still detect light between the sensor input and the

breakage)

Transmitter/transceiver is defective

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