GE Grid Solutions · GE Grid Solutions Instruction Manual GE publication code: GEK-105597E DBT...

GEGrid Solutions

Instruction ManualGE publication code: GEK-105597E

DBTDigital Trip Coil Supervision Relay

Copyright © 2016 GE Multilin Inc. All rights reserved.

DBT Digital Trip Coil Supervision Relay Instruction Manual version GEK-105597E.

DBT, EnerVista, Multilin, and GE Multilin are trademarks or registered trademarks of GE Multilin Inc.

The contents of this manual are the property of GE Multilin Inc. This documentation is furnished on license and may not be reproduced in whole or in part without the permission of GE Multilin. The content of this manual is for informational use only and is subject to change without notice.

Part number: GEK-105597E (December 2016)

For further assistanceFor product support, contact the information and call center as follows:

GE Grid Solutions650 Markland StreetMarkham, OntarioCanada L6C 0M1Worldwide telephone: +1 905 927 7070Europe/Middle East/Africa telephone: +34 94 485 88 54North America toll-free: 1 800 547 8629Fax: +1 905 927 5098Worldwide e-mail: [email protected] e-mail: [email protected]: http://www.gegridsolutions.com/multilin

mailto:[email protected]

mailto:[email protected]

http://gegridsolutions.com/multilin

DBT DIGITAL TRIP COIL SUPERVISION RELAY – INSTRUCTION MANUAL iii

DBT Digital Trip Coil Supervision Relay

Table of contents

GE Grid Solutions

1 INTRODUCTION Description ......................................................................................................................1Cautions and warnings .................................................................................................2

Safety symbols and definitions ...............................................................................................................2General cautions and warnings ..............................................................................................................3Warning symbols ...........................................................................................................................................4

2 APPLICATION Direct connection to coil ...............................................................................................5Use as a DC undervoltage relay ..................................................................................5Different connections for independent batteries ....................................................6Recommended settings.................................................................................................6

Resistance..........................................................................................................................................................6Voltage ................................................................................................................................................................6Time ......................................................................................................................................................................6

3 ORDER CODES

4 OPERATING PRINCIPLES

Internal setting.............................................................................................................................................. 13

5 TECHNICAL CHARACTERISTICS

Technical characteristics............................................................................................15Type tests.......................................................................................................................16

6 RELAY SETTINGS READY LED .....................................................................................................................19ENABLE switch ..............................................................................................................19RESET TARGET switch ..................................................................................................20LED indicators ...............................................................................................................20Coil resistance setting.................................................................................................20Voltage setting..............................................................................................................21Time delay setting........................................................................................................22Settings summary ........................................................................................................22

iv DBT DIGITAL TRIP COIL SUPERVISION RELAY – INSTRUCTION MANUAL

TABLE OF CONTENTS

7 EQUIPMENT INSTALLATION AND COMMISSIONING

Visual inspection...........................................................................................................23Mounting........................................................................................................................23Wiring .............................................................................................................................24Trip test level.................................................................................................................24Time delay test..............................................................................................................25Resistance measurement test ...................................................................................26ENABLE Test...................................................................................................................26

A WARRANTY

DBT DIGITAL TRIP COIL SUPERVISION RELAY – INSTRUCTION MANUAL 1


Chapter 1: Introduction

GE Grid Solutions

Introduction

DescriptionThe DBT is a digital trip coil supervision relay. This supervision includes:

• Coil integrity (continuously monitoring resistance). When coils are in good condition, the output COIL OK is activated.

• Control voltage (supervision of low voltage). If voltage is correct, the output BREAKER VOLTAGE OK is activated.

• Checks the breaker control circuit. If both control voltage AND coil integrity are correct, then the output BREAKER CIRCUIT OK is activated.

The activation of an NO (Normally Open) output means contacts will be closed, whereas the activation of an NC (Normally Closed) output means contacts will be opened.

In the single-coil version, the DBT monitors coil continuity whether the breaker is open or closed. It also has a timing device used to avoid failure signals during opening/closing transitions.

The three-coil version of the DBT can monitor three coils at a time, regardless of the position of the breaker. The three-coil DBT also has a timing device used to avoid failure signals during opening/closing transitions.

In addition to coil monitoring, both versions (single- and three-coil) have a continuous DC undervoltage function to monitor the battery power supply.

The supervised coils can be either tripping or closing coils. Furthermore, in the three-phase version, coils can be coming from different breakers. Instead of measuring the continuity of the circuit (like other relays), the DBT measures real resistance. It injects a current of 5 mA, limited to a maximum of 24 V. By measuring the voltage drop in the coil the DBT then calculates the resistance.

Figure 2: on page 8 (three-phase external connections) shows a typical three-coil DBT connection to a coil. When connected this way the relay can measure the coil resistance at any time (in reality, the association of the breaker coil with any other auxiliary coils), either by the 52/a type contact, if the breaker is closed, or the 52/b type if the breaker is open. The relay also measures the breaker power supply at terminals B1 and B2.

2 DBT DIGITAL TRIP COIL SUPERVISION RELAY – INSTRUCTION MANUAL

CAUTIONS AND WARNINGS CHAPTER 1: INTRODUCTION

The advantage of measuring real resistance is in selectivity, as failures in trip circuits can be detected separately, even in cases where auxiliary circuit coils are connected in parallel. In these situations a break or interruption of the breaker coil would not be detected by a continuity measurement because the auxiliary coils would create an alternative path to the current flow. On the other hand, a resistance measurement such as that made by the DBT is a valid procedure because the resistance rises when the breaker coil fails.

An extra advantage of the DBT is in its limitation of current sources to a maximum of 24 V, which avoids the DBT operating other high impedance auxiliary circuits. This kind of circuit runs the risk of being enabled by the low level of milliamperes injected by conventional monitoring relays.

When maintenance work is carried out on the breaker, a disable switch located on the front of the relay should be operated in order to deactivate all outputs. The effect produced is similar to a lack of continuous auxiliary voltage as shown in the external connections in Figure 1: on page 8 and Figure 2: on page 8.

This inhibition can also be done by energizing a digital input. The three-coil model has four inputs and the single-coil model has just one.

Cautions and warnings

Safety symbols and definitionsTo help ensure years of trouble free operation, please read through the following chapter for information to help guide you through the initial installation procedures of your new relay.

Before attempting to install or use the device, review all safety indicators in this document to help prevent injury, equipment damage, or downtime.

The following safety and equipment symbols are used in this document.

Indicates a hazardous situation which, if not avoided, will result in death or serious injury.

Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

Indicates practices not related to personal injury.

CHAPTER 1: INTRODUCTION CAUTIONS AND WARNINGS


General cautions and warningsThe following general safety precautions and warnings apply.

Ensure that all connections to the product are correct so as to avoid accidental risk of shock and/or fire, for example such as can arise from high voltage connected to low voltage terminals.

Follow the requirements of this manual, including adequate wiring size and type, voltage, current magnitudes applied, and adequate isolation/clearance in external wiring from high to low voltage circuits.

Use the device only for its intended purpose and application.

Ensure that all ground paths are uncompromised for safety purposes during device operation and service.

Only qualified personnel are to operate the device. Such personnel must be thoroughly familiar with all safety cautions and warnings in this manual and with applicable country, regional, utility, and plant safety regulations.

Ensure that the control power applied to the device, and voltage input match the ratings specified on the relay nameplate.

Hazardous voltages can exist in the power supply, control, and test circuit terminals. Make sure all sources of such voltages are isolated prior to attempting work on the device.

For tests with secondary test equipment, ensure that no other sources of voltages or currents are connected to such equipment and that trip and close commands to the circuit breakers or other switching apparatus are isolated, unless this is required by the test procedure and is specified by appropriate utility/plant procedure.

When the device is used to control primary equipment, such as circuit breakers, isolators, and other switching apparatus, all control circuits from the device to the primary equipment must be isolated while personnel are working on or around this primary equipment to prevent any inadvertent command from this device.

Use an external disconnect to isolate the mains voltage supply as per section 7.3.


CAUTIONS AND WARNINGS CHAPTER 1: INTRODUCTION

Warning symbolsThe following table explains the meaning of warning symbols that may appear on the device or in this manual

Read all instructions included in package before using your product. Additional safety information can be found in the Product Safety Supplement document available at:

http://www.gegridsolutions.com/ProductSafety/

The relevant circuit is direct current.Le circuit principal est à courant continu.

The relevant circuit is alternating current.Le circuit principal est à courant alternatif.

CAUTION: Refer to the documentation for important operating and maintenance instructions. Failure to take or avoid a specified action can result in loss of data or physical damage.AVERTISSEMENT: Se réferer à la documentation pour l'entretien et l'utilisation. L'absence ou èviter de prender des mesures spècifiques peut entraîner des pertes de données ou même causer des dommages physiques.

WARNING! Dangerous voltage constituting a risk of electric shock is present within the unit. Failure to take or avoid a specified action can result in physical harm to the user.AVERTISSEMENT! Tensions dangereuses comportant un risque de choc électrique sont presents dans l'equipement. L'absence ou èviter de prender des mesures spècifiques peut causer des dommages physiques à l'utilisateur.

CAUTION: Class 1M Laser (IEC 60825-1 Safety of laser products)DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS.AVERTISSEMENT: Laser de classe 1M (IEC60825-1) ÉVITER DE REGARDER DIRECTEMENT LE DISPOSITIF QUI ÉMET LE LASER OPTIQUE.

CAUTION: Hot surface.AVERTISSEMENT: Surface chaude.

Earth (Ground) Terminal.Terminal de terre (masse).

Protective Earth Terminal.Terminal de terre de protection.

!



Chapter 2: Application

GE Grid Solutions

Application

The DBT has been designed to monitor the biggest possible number of elements in the tripping and closing circuits of the breaker. The relay checks voltages, coil resistance and the integrity of the auxiliary contacts 52/a and 52/b, since they are also part of the trip and close circuits of the breaker.

For functional reasons, in order to avoid signalling BREAKER CIRCUIT OK when auxiliary voltage is low, it is strongly recommended using a NO output. When using a NO output the DBT protection energizes that relay and will CLOSE that output contact if both voltage and coil are correct. When auxiliary voltage is low (or null) or there is a failure in the breaker coil circuit, that output will OPEN, indicating breaker circuit failure.

Direct connection to coilAlthough there are two connections for each coil (one through 52/a and the other through 52/b) these cannot be used for two different coils because the relay compares the resistance measured by each contact. A three-phase relay is designed to monitor up to 3 coils and a single-phase relay just one.

If, for whatever reason, there is a need to make a direct connection to the coils without going through contacts 52/a and 52/b (in this case monitoring of these would be lost), it can be done. The connection of the coil at the input of 52/a must be wired and the input 52/b unconnected.

Use as a DC undervoltage relayIf you only want to use the undervoltage unit this can be done by simply disabling the coil monitoring units.

This inhibition is done by connecting inputs 52/a (terminals B3, B5 and B7 on the three-phase model, terminal B3 on the single-phase) to the negative of the breaker power supply (terminal B2), leaving inputs 52/b unconnected (terminals B4, B6 and B8 of the three-phase, B4 of the single-phase).

Once the resistance monitoring is disabled, when undervoltage condition occurs the BREAKER VOLTAGE OK and the BREAKER CIRCUIT OK contacts will become deactivated.


DIFFERENT CONNECTIONS FOR INDEPENDENT BATTERIES CHAPTER 2: APPLICATION

Different connections for independent batteriesAlthough the installation has just one battery, voltage can be distributed through different circuits (each one protected by an MCB). If you connect the auxiliary voltage (terminals B9-B10) to a different circuit from the breaker power supply circuit (terminals B1-B2), in the event of an incident in the breaker power supply (where the MCB trips) the DBT continues working and is fully operative. This provides the necessary information regarding BREAKER VOLTAGE OK and BREAKER CIRCUIT OK.

When the auxiliary voltage fails, the DBT gives a warning through the ALARM contact.

Recommended settingsThis section is included for informational purposes, given the importance of the right choice of settings to ensure good protection and the range of possible applications.

ResistanceBecause the coil is made of copper its resistance varies considerably with temperature. The temperature coefficient of copper is approximately 0.43%/ºC (see UNE 20-003 Annealed and industrial copper for electrical applications). This means that at an ambient temperature of 0ºC, resistance is 8.6% lower than that measured at an ambient temperature of 20ºC.

Furthermore, the resistance of cables connected to resistance measurement inputs of the relay can vary the resistance measured by the DBT (as a result of the common mode impedance effect).

It is also sometimes difficult to measure the resistance of a coil, and sometimes this information does not appear in the technical data for the coil.

A practical way of adjusting the DBT is to vary the resistance setting, starting from the minimum value (50 Ω) until the relay disables its resistance monitoring output. It is advisable to increase this setting to approximately 20% to reduce the impact of temperature and ground impedance.

If the setting cannot be made in this manner, apply the maximum setting (200 Ω) to avoid unwanted operation.

VoltageThe recommended setting is 10% less than the lowest expected voltage from the battery.

TimeThe recommended time varies depending on the application.

In any case, the time set must be greater than the maximum time during which both auxiliary breaker contacts (52a and 52b) are open simultaneously. The reason for this requirement is that during that time, the resistance measured by the DBT protection is infinite for both inputs (52a and 52b) indicating a fault. This fault could produce a COIL alarm if this situation is maintained over the time set in the relay.

If other auxiliary contacts are connected in series with 52a or 52b contacts (i.e. springs, etc.) their response time should be included in the calculation of the total time 52a and 52b are simultaneously open.



Chapter 3: Order codes

GE Grid Solutions

Order codes

This section lists the order codes for the DBT Digital Trip Coil Supervision Relay.

Order codes are subject to change without notice. See the ordering page at http://www.store.gedigitalenergy.com/Multilin for the latest options.

DBT * 0 0 * A 0 * 0 H 0 *

| | | |

Number of Coils 1 | | | 1 coil (single-phase)

3 | | | 3 coils (three-phase)

Coil Resistance 0 | | 75-300 Ω1 | | 150-600 Ω

Breaker Voltage 1 | 110/125 V DC

2 | 220/250 V DC

DBT1 Output Relay Option 0 See Figure 1: on page 8

DBT3 Output Relay Options 0 See Figure 2: on page 8

1 See Figure 2: on page 8

2 See Figure 3: on page 9

http://store.gedigitalenergy.com/Multilin/


CHAPTER 3: ORDER CODES

Figure 1: External connections - single coil (226B6291H5)

Figure 2: External connections - three coils (226B6291H4)

C11

D11

D12

C12

C10

D10

D9

C9

INHIBITION

FUENTE DEALIMENTACIONPOWER SUPPLY

B9 C1

B1BREAKER VOLTAGE

B11

B2

CHASIS

52a b

52

TRIP

TC52

ALARMA EQUIPO

CIRCUITO INTERRUPTOR

INTERRUPTOR

(+)

D1

(-)(PUEDEN SER NEGATIVOS SEPARADOS)

B10

CIRCUITO

TENSION MANDO

/CASE

(PUEDEN SER POSITIVOS SEPARADOS)

SYSTEM READY

BREAKER CIRCUITINHIBICION

B3

B4

52a

52b

TENSION MANDOBREAKER VOLTAGE

CORRECTO

CORRECTO

O.K.

O.K.BREAKER CIRCUIT

CERRADOCLOSED/C=ABIERTOOPEN/O=

CONTACT LOGICLOGICA CONTACTOS:

OC

CO

CO

CAN BE CONNECTED TO ISOLATED CIRCUITS

PROTECTIVE EARTHTIERRA DE PROTECCION

CAN BE CONNECTED TO

SIN VauxNO VauxVauxVauxVauxVaux

y FALLO& FAILy NO FALLO& NO FAIL

ISOLATED CIRCUITS

TENSION MANDO CORRECTABREAKER VOLTAGE O.K.

CHASIS /CASEB12

DC

Instalar un magnetotérmico de 20A máx. antes de las bornas de alimentación

Nota: Se recomienda instalar un cable de 2,5mm² de sección

20A max. circuit breaker located before power input

Note: 2,5mm² wiring recommended

WARNING

WARNING

C11

D11

D12

C12

C10

D10

D9

C9

D8

C8

D7

C7

D6

C6

INHIBITION


B9 C4C3C2C1

B1BREAKER VOLTAGE

52a B3BOBINA 1

1BOBINA B452b

52bB6

BOBINA 2

2BOBINAB5

52a

52aB7

BOBINA 3

3BOBINAB8

52b

B11

B2

B12CHASIS

TIERRA DE PROTECCION

52a b

52

TRIP

TC52

ALARMA EQUIPO

CIRCUITO INTERRUPTOR

INTERRUPTOR

BREAKER VOLTAGE

COIL #

(+)

D1 D2 D3 D4

(-)

CAN BE CONNECTED TO

B10

CIRCUITO

/ COIL # 1

1/ COIL #

/ COIL # 2

2/ COIL #

/ COIL # 3

3/ COIL #

TENSION MANDO

/CASE

PROTECTIVE EARTH


CONF.01

CONF.00

SYSTEM READY

BREAKER CIRCUIT

TENSION MANDO

1BOBINA1 O.K.

22

COIL #

33

COIL #

INHIBICION

(*) Se pueden configurar como CIRCUITOINTERRUPTOR CORRECTO, mediante un ajuste interno.

Internal setting allows shift toBREAKER CIRCUIT configuration.


(PUEDEN SER

CORRECTO

CORRECTO

O.K.

BREAKER CIRCUIT O.K.

CORRECTAO.K.

CORRECTA

BOBINA CORRECTAO.K.

BOBINA CORRECTAO.K.

(*)

O.K.

O C

O C

C O

LOGICA CONTACTOS:CONTACT LOGIC

O= OPEN/ ABIERTOC= CLOSED/ CERRADO

ISOLATED CIRCUITSCONFIGURACIONES SEGUN MODELOMODEL LIST CONFIGURATIONS

NO FAIL&NO FALLOyFAIL&FALLOy

VauxVauxVauxVaux

VauxNOVauxSIN

NEGATIVOS SEPARADOS)CAN BE CONNECTED TO ISOLATED CIRCUITS

OR

(INTE

RN

AL

SW

ITC

H IN

PO

SIT

ION

I)

CHASIS /CASE

DC





WARNING

WARNING



Figure 3: External connections - model DBT3000A*0H02 (226B6291H6)

C11

D11

D12

C12

C10

D10

D9

C9

D8

C8

D7

C7

D6

C6

INHIBITION


B9 C4C3C2C1

B1BREAKER VOLTAGE

52a B3BOBINA 1

1BOBINA B452b

52bB6

BOBINA 2

2BOBINAB5

52a

52aB7

BOBINA 3

3BOBINAB8

52b

B11

B2

CHASIS

52a b

52

TRIP

TC52

ALARMA EQUIPO

CONTACTO

(+)

D1 D2 D3 D4

(-)

B10

/ COIL # 1

1/ COIL #

/ COIL # 2

2/ COIL #

/ COIL # 3

3/ COIL #

TENSION MANDO

/CASE


CONFIGURATION02 CONFIGURACION

SYSTEM READY

#

INHIBICION


O C

O C

C O

LOGICA CONTACTOS:CONTACT LOGIC

O= OPEN/ ABIERTOC= CLOSED/ CERRADO

TEN

SIO

NA

UX

ILIA

RA

UX

ILIA

RY

VO

LTA

GE

11 CONTACT

CONTACT22

#CONTACTO

CONTACT33

#CONTACTO

CONTACT44

#CONTACTO

CONTACT55

#CONTACTO

CONTACT66

#CONTACTO

(REE)

CAN BE CONNECTED TO ISOLATED CIRCUITS

TIERRA DE PROTECCIONPROTECTIVE EARTH

ISOLATED CIRCUITSCAN BE CONNECTED TO(PUEDEN SER NEGATIVOS SEPARADOS)

NO FAIL&NO FALLOyFAIL&FALLOy

VauxVauxVauxVaux

VauxNOVauxSIN

OR

CHASIS /CASEB12

DC





WARNING

WARNING



Chapter 4: Operating principles

GE Grid Solutions

Operating principles

Figure 4: on page 12 shows the basic operation of the DBT (the most common case of a 3-phase version).

Seven units of measurement can be seen:

1. Voltage measurement for undervoltage function of the breaker power supply.

2. Resistance measurement of coil 1 through contact 52/b.

3. Same through contact 52/a.





The first measurement unit serves an undervoltage comparator which will give a signal if the voltage is lower than the setting, activating an adjustable timer between 0.2 and 20 seconds. If the undervoltage continues for at least the set time, the timer output will activate the signal breaker voltage failure and also the signal general failure. The activation of failure signals deactivate the corresponding output relays.


CHAPTER 4: OPERATING PRINCIPLES

Figure 4: Block Diagram (226B2209H1)

'Deactivation of a relay' is understood to mean that it changes to its standby position as shown in the external connections diagram, i.e. an NO closes and an NC opens.



The timer has a preset voltage drop time of 100 ms, thereby ensuring a minimum time in which the output contacts are maintained for at least 100 ms.

Two resistance measurement devices are located after the undervoltage unit, both monitoring the first coil. The resistance measurement is calculated through the voltage drop produced by the current injected by the current sources.

Supposing that the breaker is closed, auxiliary contact 52/a would also be closed, whereas 52/b would be open. The measuring unit connected to 52/b would show a higher voltage than that of the resistance setting, i.e. the DBT will measure a higher resistance than the setting. On the other hand, the unit connected to 52/a will give a lower resistance reading than the setting, taking into account that the coil circuit is correct.

Both resistance measuring unit outputs are the inputs of an equality comparator (this is a comparator that produces output when both inputs are high or low, i.e. equal). In the example mentioned, one measuring unit gives a HIGHER resistance than the setting whereas the other gives a LOWER resistance. Therefore, the comparator detects inputs are not equal and does not produce an output signal, which means coil circuit is in a good condition. In case the coil is broken, resistance measured by both units is infinite (i.e. equal) and the equality comparator produces a failure signal. That signal is feed into a timer. After the set time elapses with a failure signal, two signals are generated, coil failure and general failure.

As described for coil 1, the 3-phase DBT has circuits for a second and third coils.

In the case of a single-phase DBT, there are only resistance measuring unit for coil 1 (in addition to the undervoltage unit).

Internal settingIn the 3-coil DBT model, there is an internal setting which can be made by moving a jumper in the printed circuit, that allows to configure all the outputs as general ones (BREAKER CIRCUIT OK). Any failure (undervoltage or resistance) will mean that all outputs will be deactivated.

In addition to the outputs mentioned, and as described in detail in Figure 1: on page 8 & Figure 2: on page 8: External Connections, the DBT has a SYSTEM READY output relay. This closes the contact in case the relay is not available due to one of the following causes:

• An internal fault.

• An auxiliary voltage drop of the supply.

• The relay has been disabled.

The DBT can be disabled either externally by enabling one or several of any of the 4 digital inputs for inhibition (in the case of the 3-phase) or by the single input for the single-phase, or locally by the switch labelled ENABLE. A disabled DBT will continue to measure and give information through the LEDs but all its relays will be inoperative except the SYSTEM READY relay, which will close its contact.



Chapter 5: Technical characteristics

GE Grid Solutions

Technical characteristics

Technical characteristicsTechnical characteristics are subject to change without notice.

AUXILIARY SUPPLY

A ripple factor is allowed provided that the instantaneous voltage does not exceed the indicated upper and lower limits. For example, on the 110-125 V model the voltage at any given time should never drop below 88 V nor go above 150 V.

110-125 V DC ± 20%220-250 V DC ± 20%

TEMPERATURE RANGESOperational range: -25ºC to + 55ºCStorage range: -40ºC to + 70ºC

HUMIDITYUp to 95% without condensation.

OUTPUT CONTACTSBreaking capacity: 4000 VAMaximum DC voltage: 300 V DCMaximum AC voltage: 440 V ACContinuously: 16 AMaking capacity: 30 A

ACCURACYVoltage: ± 5%Resistance: ± 10%Time: 20 ms

VOLTAGE CIRCUIT BURDEN110-125 V DC model: 48 kΩ220-250 V DC model: 96 kΩ


TYPE TESTS CHAPTER 5: TECHNICAL CHARACTERISTICS

DIGITAL INPUT BURDEN110-125 V DC model: 66 kΩ 220-250 V DC model: 132 kΩ

AUXILIARY POWER CONSUMPTIONStandby: 4 W (only NC alarm relay activated)Operated: 16 W (all relays activated)

WEIGHTSNet: 3 kgPacked: 4 kg

WATERTIGHTNESSIndex: IP40

ENVIRONMENTAL CHARACTERISTICSOvervoltage Category: IIIPollution Degree 2Insulation Class 1

DIMENSIONSWidth: 483 mm (19" rack)Depth: 200 mmHeight: 45 mm (1 height unit)

INSULATIONAs per IEC 60255-27.Between terminal and case: 2300 V AC for 1 minute at industrial frequency.Between independent circuits: 2300 V AC for 1 minute at industrial frequency.

Type tests

Category Standard Class Test

Safety

Dielectric voltage withstand IEC60255-27 2.3 kV

Impulse voltage withstand IEC60255-27 5 V

Enclosure protection IEC60255-27/IEC60529 IP40

Insulation resistance IEC60255-27 500 V (test level)

EMC

Electrostatic discharge immunity IEC60255-26/IEC1000-4-2 Level 3

Radiated RF electromagnetic Field immunity IEC60255-26/IEC1000-4-3 Level 3

Electrical fast transient immunity IEC60255-26/IEC1000-4-4 Zone B

Surge immunity IEC60255-26/IEC1000-4-5 Zone B

Conducted RF immunity IEC60255-26/IEC1000-4-6 Level 3

Power magnetic immunity IEC60255-26/IEC1000-4-8 Level 4

Damped oscillatory wave immunity IEC60255-26/IEC1000-4-18 2.5 kV common mode1 kV diff. mode

Voltage dips and interruptions IEC60255-26/IEC1000-4-29 Levels based on IEC61000-4-29

Ripple on DC IEC60255-26/IEC1000-4-17 15% rated DC value

Gradual shut down IEC60255-26 Levels based on IEC60255-26

Radiated and conductive emissions IEC60255-26/CISPR11/CISPR22 Class A

CHAPTER 5: TECHNICAL CHARACTERISTICS TYPE TESTS


The DBT relay complies with these Standards, which includes the GE Standard on the level of insulation and electromagnetic compatibility required by CE Directive 2014/30/EU, according to standardised European regulations. It also complies with the European Low Voltage Directive and the environmental and operational requirements laid down in Standards IEC 60255-26 and IEC 60255-27.

The cables used for digital inputs shall be less than 10 meters in length.

Figure 5: Mechanical dimensions and cutout (226B6086H11)


TYPE TESTS CHAPTER 5: TECHNICAL CHARACTERISTICS

Figure 6: Rear terminal plate (226B6292H1)



Chapter 6: Relay settings

GE Grid Solutions

Relay settings

This chapter describes the LEDs and their settings, seen from left to right. If a relay is not available, refer to the figure below for reference:

Figure 7: Faceplate (B1298H3)

READY LEDA two-color LED indicating one of the following:

• Off: indicates absence of auxiliary supply voltage.

• Green: the relay is fully operational.

• Red: The relay is disabled, either because one of the disabling inputs has been enabled or because it has been disabled with the ENABLE switch.

When the DBT is disabled all its outputs are disabled and the SYSTEM READY relay is closed. However, all the measuring, decision and timer units stay operational, as do the LED indicators.

ENABLE switchThis switch has two positions:

• Left: relay disabled. READY LED is red.

• Right: relay enabled. READY LED is green, provided none of the external disabling inputs are active.


RESET TARGET SWITCH CHAPTER 6: RELAY SETTINGS

At the back of the relay there are digital disabling inputs on terminals C1-D1, C2-D2, C3-D3 and C4-D4 (3-phase model) and C1-D1 for the single-phase model (see Figure 6: Rear terminal plate). The enabling of any of these inputs has the same effect as the ENABLE switch in the left position.

The enabling of the inputs is DC operated (same margin as supply voltage). As there is galvanic insulation between them they can be enabled by voltage from different batteries or can be grouped in a single one. These inputs are polarised, the positive on the C terminals and the negative on the D terminals. An inversion of polarity has no negative effects on the relay, although the input would not be enabled.

RESET TARGET switchThis switch has two uses:

• Acknowledgement of indicators: A fault is recorded by an LED with memory. This is erased by pressing and releasing the RESET button. If the auxiliary voltage drops the registered LED operation will be erased too.

• Checking indicators: This feature is used to ensure indicators are working properly. When the RESET button is pressed all the indicators which are out will lit up.

LED indicatorsThere are four LEDs, the first indicates a breaker power supply fault and the others coil faults. They are red LEDs, and can be in one of the three following states:

• Off: This means there is no fault. In the case of the breaker power supply it would be above the preset voltage. For coils, that their resistances are not above the preset value.

• Flashing red: fault situation. If this situation continues for the preset time period, the output relay will be enabled and the LED will continue to flash.

• Red: a fault has occurred but disappeared, although not yet acknowledged by the user. This acknowledgement is done by pressing RESET.

If a red light is present and another fault occurs the LED does not flash, but when RESET is pressed the LED starts to flash.

Coil resistance settingThis is the coil failure circuit threshold. It is a block of 4 dip switches.

The minimum value is 75 Ω, the maximum 300 Ω and the step 15 Ω.

For example, if a setting of 150 Ω is required, put dip switches 1 and 3 in the UP position. You then have: 75 Ω + 15 Ω + 60 Ω = 150 Ω.

The DBT will consider that there is a fault condition if BOTH resistances measured in 52a and 52b inputs are OVER the setting. It also will consider a fault when both resistances are BELOW the setting, because this is not a normal condition.

The fault has to be maintained during the set time to allow the output relay to operate. This time prevents misoperation during breaker status transition.

CHAPTER 6: RELAY SETTINGS VOLTAGE SETTING


Voltage settingThis is the threshold for the breaker power supply failure unit. As in the case of the resistance setting, it is a block of 4 dip switches.

For the 110/125 V DC model, the minimum value is 50 V, the maximum 125 V, and the step 5 V.

For the 220/250 V DC model the values are double the above, so the minimum is 100 V, the maximum 250 V and the step 10 V.

If a setting of 115 V is required (110/125 model), raise dip switches 1, 3 and 4, making a total of: 50 + 5 + 20 + 40 = 115 V. This is equivalent to 230 V on the 220/250 V model.


TIME DELAY SETTING CHAPTER 6: RELAY SETTINGS

Time delay settingThis is the timer adjustment, made through a block of 3 dip switches.

The minimum value is 0.2 seconds, the maximum 20 and the step 0.1.

Although it is theoretically possible to select a time which is higher than the maximum (for example, if all the dip switches are put in the UP position you apparently have a setting of 27.5 seconds, the maximum), in reality, if all the dip switches are in the UP position the setting is 20 seconds. Therefore, any adjustment above 20 seconds will be considered as if it were 20 seconds. This has been done because there is no point in having a higher setting.

Settings summaryThe table below shows the range of each setting:

Setting Name Max Min Step

Relay Enable Enabled Disabled -

Resistance75 - 300 Ω model150 - 600 Ω model

300 Ω600 Ω

75 Ω150 Ω

15 Ω30 Ω

Voltage110/125 model220/250 model

125 V250 V

50 V100 v

5 V10 V

Time Delay 20 s 0.2 s 0.1 s



Chapter 7: Equipment installation and commissioning

GE Grid Solutions

Equipment installation and commissioning

Visual inspectionCheck that the information on the faceplate matches the details of the order. A check should also be made to ensure that the relay is not scratched or visibly damaged, and that there are no loose parts as a result of poor handling in transit.

The model number and electrical characteristics of the unit are indicated on the nameplate located on the top of the relay case.

The metallic case of the unit is highly resistant to corrosion, and is made of stainless steel, coated with an epoxy layer. The rest of the metallic pieces are covered with a high quality resistive coating.

MountingThe unit is designed for semi-flush mounting . The relay is secured to the panel with the 4 M6 screws provided with the unit. The user has access to the front keypad, display and communication port. The wiring is at the rear of the unit. The drilling dimensions are shown on Figure 5.

Installation, test and maintenance must be performed by trained personnel, having appropriate technical training and experience necessary to be aware of hazards to which that person may be exposed in performing installation/maintenance and of measures to minimize the risks to that person or other persons.

Each DBT relay must be mounted in secondary enclosure to prevent operator access to the live parts at the rear terminals during equipment operation in normal condition. All parameters settings and monitoring is located on the front panel of the unit.

"Normal condition": equipment installed and operated under the normal operating conditions for the specified equipment as defined by the manufacturer (excluding maintenance).


WIRING CHAPTER 7: EQUIPMENT INSTALLATION AND COMMISSIONING

WiringRefer to Figure 1: on page 8, Figure 2: on page 8, and Figure 3: on page 9.

Module withdrawal and insertion may only be performed when control power has been removed from the unit.

The relay is wired through the terminal blocks located at the rear of the unit. Refer to Figure 6: on page 18.

The terminal blocks, incorporate high quality connectors with the capacity to withstand a rated current of 15 A at 300 V. These terminal blocks admit a cable section of up to 2.5 mm2 (AWG12).

The relay should be connected directly to the ground bus, using the shortest practical path. A tinned copper, braided, shielding and bonding cable should be used. As a minimum, 96 strands of number 34 AWG should be used wired to the protective ground screw. Refer to Figure 6: on page 18.

A 20 A maximum MCB or equivalent fuse has to be located before power input. A 2.5 mm2 cable (AWG12), 300 V rated is recommended for wiring.

Trip test levelConnect the relay as indicated in the external connections diagram (Figure 1: on page 8 and Figure 2: on page 8). Use a DC power supply (110/125 or 220/250 V) for the auxiliary voltage (terminals B9-B10), according to the model. Variations of 20% are allowable (-20% of the minimum and +20% of the maximum). For the breaker power supply (terminals B1-B2), a second variable DC power supply is needed.

Apply different voltages and check that the undervoltage LED flashes (pick-up) with the pick-up voltage (see table below). The LED remains flashing, until the undervoltage condition disappears (drop-out voltage). When the drop-out voltage is reached, and the set time elapses, the LED stop flashing and is lit permanently (fault memory function). It is recommended to set the time to the minimum in order to simplify the test.

Table 1: 110/125 V model

Table 2: 220/250 V model

VOLTAGE setting (V) Pick-up voltage (V)(voltage failure)

Drop-out voltage (V)(voltage OK)

50 45 55

55 50 60

60 55 65

70 65 75

90 85 95

125 118 133

VOLTAGE setting (V) Pick-up voltage (V)(voltage failure)

Drop-out voltage (V)(voltage OK)

100 90 110

110 100 120

120 110 130

140 130 150

180 170 190

250 236 264

CHAPTER 7: EQUIPMENT INSTALLATION AND COMMISSIONING TIME DELAY TEST


Time delay testThe check the tripping time the loss of continuity of the coil connected to terminals B2 and B3 will be simulated.

Insert a dual-circuit switch. One of the circuits which is normally closed will short-circuit terminals B2 and B3, simulating that the coil is correct. The other contact (normally opened) will be connected to the start-up of a timer. The timer stop will be connected to one of the breaker circuit failure relays. When the push-button is pressed the B2-B3 will be opened, leading to a start of failure.

Create a fault as described (above) and check that the results match those in the following table:

* The maximum setting will be made by placing all the dip switches in the UP position. The setting is limited to 20 s (as explained previously).

Measure the drop-out time of the output relay.

This time will be between 100 and 150 ms (nominal value 125 ms).

During this test it can be seen that the measured times may vary slightly owing to the response time of the measuring units and the output relays.

TIMER DELAY setting

Minimum time Maximum time

200 ms 200 ms 240 ms

300 ms 300 ms 340 ms

400 ms 400 ms 440 ms

600 ms 600 ms 640 ms

1 s 1 s 1.04 s

1.8 s 1.8 s 1.84 s

3.4 s 3.4 s 3.44 s

6.6 s 6.6 s 6.64 s

13 s 13 s 13.04 s

Maximum * 19.9 s 20.1 s

CLOCK

start stopDBT

P U C11 S Breaker H D11 circuit

B failure U B3 T

T B2ON


RESISTANCE MEASUREMENT TEST CHAPTER 7: EQUIPMENT INSTALLATION AND COMMISSIONING

Resistance measurement testTo carry out this test, which is done on the measuring unit of coil 1, disconnect terminal B4 and leave it unconnected (simulating an open circuit). Place a resistor (simulating the breaker coil) between terminals B2 and B3. This resistance should give the readings indicated in the table below.

Check that the relays do not trigger at the minimum values and that they do at maximum values.

The test is done in the sequence described for each of the settings indicated.

Repeat this test for the units corresponding to coils 2 and 3.

ENABLE TestDisable the relay by putting the ENABLE switch in the left-hand position. Check that there is no disabling through the digital inputs (disconnect or de-energize these inputs).

The alarm contact will close and the enabled relays will drop-out. The READY LED will go from green to red.

Enable the relay by putting the ENABLE switch in the right-hand position.

Repeat this test by applying nominal voltage to each of the 4 digital inputs (3-phase model) and the single input for the single-phase model. The results should be the same as when the relay is disabled using the ENABLE switch.

Resistance setting (Ω) Minimum R (Ω) Maximum R (Ω)

7550 6745 5582

9060 8255 6599

10570 9565 11575

13590 12284 96149

19530 175123 137215

300200 270180 330220



Appendix A: Warranty

GE Grid Solutions

Appendices Warranty

For products shipped as of 1 October 2013, GE warrants most of its GE manufactured products for 10 years. For warranty details including any limitations and disclaimers, see our Terms and Conditions at:

https://www.gegridsolutions.com/multilin/warranty.htm

For products shipped before 1 October 2013, the standard 24-month warranty applies.


APPENDIX A: WARRANTY

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