Digital Protective Relays Spec En

7/22/2019 Digital Protective Relays Spec En

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Specification for Tender 219663416.doc

Last update : 2006-04-jj - 1 -

General Specification for Digital

Protective Relay of MV Switchgear

This specification defines:

Requirements for the Manufacturer

Basic requirements for the Digital Protective Relay

Digital Protective Relay functional description

Tender documents

Testing, commissioning, maintenance requirements


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Table of contents:

1. General ......... p. 3

2. Requirements for the manufacturer .. p. 3

2.1 Certifications........ p. 3

2.2 Experience........ p. 3

2.3 Local support........................ p. 3

3. Basic requirements for the Digital Protective Relay......................... p. 4

3.1 General requirements .......... p. 4 - 5

3.2 General Digital Protective Relay design requirements ....................... p. 5 - 6

3.3 Digital Protective Relay general and practical operating requirements..... . p. 7

3.4 Digital Protective Relay installation rules and requirements .......................... p. 7 - 8

4. Digital Protective Relay description ...................................... p. 8

4.1 Protection................................................. p. 8 - 9

4.2 Control and Monitoring................... p. 9

4.3 Metering........................................... p. 10

4.4 Network, Machine and Switch gear diagnosis.... p. 10 - 11

4.5 Relay diagnosis ............................................... p. 12

4.6 Programming and configuration software ............... p. 12

4.7 User Machine Interface....................................................... p. 13

4.8 Communication ................... p. 13 - 14

4.9 Digital Protective Relay hardware architecture platform....... p. 14

5. Tender documents ........... p. 14

6. Protection relay testing , commissioning and maintenance ........ p. 14

6.1 Testing ..... p. 14

6.2 Commissioning tests ........................... p. 14 - 15

6.3 Maintenance.................................... p. 15

7. Annexes ..... p. 16

7.1 Annex A1...... p. 16

7.2 Annex A2............................................. p. 17

7.3 Annex A3.............................. p. 18

7.4 Annex A4............................. p. 19

7.5 Annex A5.............................. p. 20

7.6 Annex A6.............................. p. 21

7.7 Annnex A7............................ p. 22



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1. General

This part of the specification describes the general requirements for a Digital Protective Relay, to comply

with National, IEC, EN, CSA and NEMA standards and for use in the low voltage compartment of a

Medium Voltage switch gear cubicle or a in separate control panel.It also defines Low, Mid and High-end solutions to protect the following Medium Voltage Low, Mid, High

power applications:

1.1 Substation (feeder or incomer type)

1.2 Transformer

1.3 Motor

1.4 Generator

1.5 Busbar

1.6 Capacitor bank

2. Requirements for the manufacturer2.1 Certifications

The Digital Relay manufacturer shall have a valid ISO 9001 (2000 version) certification and an applicable

Quality Assurance and Quality Control system.

The Digital Relay manufacturer shall have the Environment Certification ISO 14001 and shall be able to

supply the Product Environmental Profile (P.E.P) on the engineers request.

2.2 Experience

The Digital relay manufacturer shall have a long term experience in designing and manufacturing Digital

Protective Relays and have relevant business volume and references in order to provide credibility in hiscommitments and a long term support capability.

2.3 Local support

The manufacturer/supplier shall have a permanent representative office with a trained and skilled support

staff, in the country or in the region where the Digital Relays are delivered, in order to prove his

commitment for local or regional support and to provide a channel for communication.

The local or regional support team shall be easily reached and shall be able to arrive on site whenever

accessible within (x x) hours notice.

The engineers employed by the suppliers local or regional office shall be certified by the manufacturer and

provide start-up service including physical inspection of the Digital Relay, connected wiring and final

adjustment, to ensure that the Digital Relay meets the required performance.

The manufacturer shall be able to offer commissioning of the Digital relay to be carried out by the local or

regional office.

The most common spare parts shall be available within (x x) Hours/days from the notification through the

local or regional service centre of the supplier.



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3. Basic requirements for the Digital Protective Relay

3.1 General requirements

The Digital Protective Relay shall comply with the most relevant national, international standards and

recommendations for industrial electrical distribution (IEC, EN, UL, CSA) as per table (1)

Digital Protective Relay Standards - Table 1 -

Requirements Standards Level

Protection relays IEC 60255

Electro Magnetic

Compatibility (EMC)

Emission tests

Disturbing field emission

Conducted field emission

Immunity tests

Radiated disturbances

radiated fields

electrostatic discharge

to power magnetic fields at

network frequency

Conducted disturbances

RF disturbances

fast transient bursts

damped oscillating waves

surges

voltage interruptions

IEC 60255-25

EN 55022

IEC 60255-25/EN 55022

IEC 60255-22-3

IEC 61000-4-3

ANSI C37.90.2

IEC 60255-22-2, ANSI C37.90.3

IEC 61000-4-8

IEC 60255-22-6

IEC 60255-22-4IEC 61000-4-4

ANSI C37.90.1

IEC 60255-22-1, ANSI C37.90.1

IEC 61000-4-5

IEC 60255-11

A

III

4

IIIA and

B

IV

III

Environmental

Mechanical constraints

In operation

vibrations

shocks

earthquakesDe-energised

vibrations

shocks

jolts

IEC 60255-21-1

IEC 61000-2-6

IEC 60255-21-2

IEC 60255-21-3

IEC 60255-21-2

IEC 60255-21-2

IEC 60255-21-2

2

Fc

2

2

2

2

2

Safety Enclosure tests

Mechanical protection degree

Fire withstand

Electrical tests

earth continuity

1.2/50s impulse wave dielectric at network frequency

IEC 60529

NEMA

IEC 60695-2-11

IEC 61131-2

IEC 60255-5IEC60255-5, ANSI C37.90

IP52

Type

12

Climatic conditions In operation

to cold IEC 61068-2-1 Ad



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to dry heat

to damp heat

salt mist

corrosion influence/Gas test

In storage

temperature variation

to cold

to dry heat

to damp heat

IEC 61068-2-2

IEC 61068-2-78

IEC 61068-2-52

IEC 61068-2-60

IEC 61068-2-14

IEC 61068-2-1

IEC 61068-2-2

IEC 61068-2-78

IEC 61068-2-30

Bd

Cab

Kb/2

Nb

Ab

Bb

Cab

Db

Certification (*) CE

UL

CSA

GOST

EN 50263 harmonised standard

European directive

UL508

CSA C22.2

Low Voltage electricalinstallations

IEC 60364

Functional Safety of

electronic safety related

systems

IEC61508

Communication Data transmission industrial

protocol: Modbus RTU

Between protective relay and

control system inside a power

station

For power substation automation

inside the substation

IEC 61158 Field Bus foundation

EC 870-5 series and

IEC 870-5-103 DNP3

IEC 61850

(*) The Digital Protective Relay shall be CE marked, conforming to European Low Voltage (73/23 EEC and

93/68 EEC) and EMC (89/336/EEC) Directives, UL/CSA marked according to UL 508C and shall have

GOST marking for Russia and Eastern Europe.

3.2 General Digital Protective Relay design requirements

3.2.1 Technology and Functionality:

The Digital Protective Relay design shall be based on a microprocessor technology and shall accommodate ahardware and software architecture consisting of a multifunction protection and control platform with

logic/analogue inputs and outputs, including Protections, Metering, Control and Monitoring, User Machine

Interface with alphanumeric display, Communication Interface, Network, Machine, Switch gear and relay

diagnosis functionalities.

3.2.2 Safety and Dependability (Functional Safety)

The Digital Protective Relay design shall be part of a safety and dependability design process of the

manufacturer, associating the four R.A.M.S parameters:

3.2.2.1 Reliability:

To define a predictive calculated and field measured MTTF, determine a Failure Rate and a useful lifetime of the digital relay.



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3.2.2.2 Availability:

To prevent any nuisance or unwanted tripping by selecting the adequate settings and improve the continuity

of service.

3.2.2.3 Maintainability:

To define the Time to repair and spare part requirements in the maintenance process.

3.2.2.4 Safety:

To increase the level of protection safety without lowering the process availability according to IEC 61508

requirements and determine a S.I.L (Safety Integrity Level) capability, a P.F.D ( Probability of Failure on

Demand) and a S.F.F (Safe Failure Fraction) measuring the percentage of failures seen by the Watchdog

leading to a safe position.

The Digital Protective Relay shall therefore be fitted with an internal self-test monitoring system

(Watchdog) testing the relay power supply, the acquisition of current and voltages signals, the processing

unit (memories, processor(s)), software/hardware watchdog, logic inputs/outputs.

In case of an internal failure making the relay inoperant, the relay shall be set in fail-safe position leading to

a fall-back position and shall not trip the circuit breaker equipped with shunt trip coil (e.g: loss of internal or

external power supply). All the relays outputs and logic inputs shall be locked in deactivated position.

The watchdog function shall be able to activate a vertical back-up protection architecture based on an

upstream protective relay rescuing a downstream defective relay.

Any minor safe internal failure shall enable the relay to normally perform its protection functions in a

downgrading mode.

3.2.3 Programming and Configuration

The Digital Protective Relay shall be programmable and configurable with an appropriate user-friendly

setting software using a MS Windows program running on a standard PC. The programming and

configuration shall be carried out locally (front access) through a RS 232 port or remotely through a

communication network, mainly an Engineering LAN (E-LAN) with adequate passwords to prevent any

unwanted intrusion.

Programming and configuration shall also be able to be prepared on a PC file directly (unconnected mode)

and down-loaded locally or remotely into the relay.

3.2.4 Hardware and Software architecture

The hardware and software architecture shall be modular and disconnectable to adapt the protection and

control unit to the required level of complexity of the MV applications.

The architecture shall allow future extensions by simple and easy hardware and firmware upgrading of the

protection and control unit and shall be designed to enable upward compatibility between Digital Protective

Relay of different generations of the manufacturer.

The architecture shall provide easy cost efficient maintenance operations when changing modules.

The Protective Digital relay shall accommodate digital and isolated inputs/outputs. The inputs shall be used

to monitor the status of the complete MV panel as well as receive external signal (e.g: Buchholz, inter-trip,

etc,) while the outputs shall be used for circuit breaker or contactor control, inter-tripping between panels

and remote alarms.



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3.3 Digital Protective Relay general and practical operating requirements

The Protective Digital Relay shall operate according to the following conditions:

Temperature: - 25C to +70C

External auxiliary power supply:

- For Low and Mid-end solutions/ applications

- For High-end solutions/applications:

From AC/AC UPS system or dual battery charger

24V-250V DC and 110V-240V AC (50Hz/60Hz)

24V-250V DC

Current sensors: In/1A or In/5A current transformers, LPCT( Low Power

Current Transformer) , Core Balance CTs or interposing

ring CT

Voltage sensors: 100V, 110V, 100V/ 3, 110V/3 and voltages as per IEC

60 255-6

3.3.1 The circuit breaker control output relay contact shall be capable of withstanding a 30A DC current for

0.2seconds and 2000 operating cycles according to ANSI C37.90-clause 6.7.

3.3.2 Other logic output relay contacts shall be capable of withstanding a 8A DC/AC steady state current

3.3.3 Logic input pilot voltage shall be rated as per the auxiliary power supply of external driven digital

signals from the control system (RTU or PLC) and shall comply with IEC 60011-32.

3.3.4 Current carrying terminal from current sensors shall be automatically short circuited when withdrawingcurrent sensor modules.

3.3.5 Provisions shall be made in the switch gear cubicle for testing and calibrating the relay by current

injection using an external source, without disconnecting the permanent wiring.

3.3.6 CT/VT and Trip coil supervision facilities shall be provided to check the wiring circuit continuity with

relevant alarms and messages.

3.3.7 The Digital Protective Relay shall be continuously rated and shall maintain the setting accuracy

without setting drift over time and full range of auxiliary voltage variations as per the requisition.

3.3.8 The Digital Protective Relay shall be capable of withstanding the output current of the associated

current transformers corresponding to a primary current equal to the specified short circuit withstand current

and time of the assembly ( 4 In permanent, 100 In 1 second).

3.3.9 The Digital Protective Relay shall have a constant 150 year minimum design MTTF during its useful

life time which shall not be less than 15 years in proper temperature and environmental operating conditions.

3.3.10 Any component substitution because of component obsolescence shall not affect the upward

compatibility between relays on duty

3.4 Digital Protective Relay installation rules and requirements

The Digital Protective Relay shall be able to be flush mounted or mounted inside the Low Voltage

compartment and shall have an IP52 mechanical protection degree according to IEC 60529.



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To operate properly and to achieve satisfactory operating quality, the Digital Protective Relay shall be

installed so that it shall be protected against EMC, and the following points shall be required:

3.4.1 A single equipotential earth system used as the site potential reference

3.4.2 A power distribution with TN-S earthing system

3.4.3 Separation of different kinds of cables (power, power supply, auxiliary, data, measures)

3.4.4 Use of equipotential metallic structure for cable trays

3.4.5 Use of screened cables for data and measure

3.4.6 A power supply protection (filtering, over voltage protection)

3.4.7 Equipment and installation protection against the indirect effects of lightning

4. Digital Protective Relay description

4.1 Protection

The Digital Protective Relay shall integrate all the necessary ANSI code protections according to the

different levels of applications (as per the protection selection guide in Annex A1, A2, A3, A4, A5, A6) and

shall provide wide setting ranges mainly for current protections and a large choice of tripping curves through

two setting groups (normal/back-up mode network) operated by logic input:

4.1.1 Definite Time (DT) curve

4.1.2 IDMT curves set by T time delay or TMS factor, including:

- IEC curves (SIT, VIT/LTI, EIT)

- IEEE curves (MI, VI, EI)

- Usual curves (UIT, RI, IAC)

4.1.3 Customised tripping curve possibilities shall be available for specific Phase, Earth fault over currentand directional Phase, Earth fault applications or revamping

ANSI code Tripping

curve

Threshold Tripping time delay

50/51(High-end

solutions/applications)

DT

IDMT

Is set point 0,05 to 24 In

0,05 to 2,4In

Inst: 0,05 sec to 300 sec

0,1 sec to 12,5 sec at 10

Is

50N/51N (High-end


DT

IDMT

Is0 set point 0,01 to 15 In0 (min

0,1A)

0,1 to 1 In0 (min 0,1A)

Inst: 0,05 sec to 300sec

0,1sec to 10 Is0

50/51(Low, Mid-end


DT

IDMT

Is set point 0,1 to 24 In

0,1 to 2,4In

Inst: 0,05 sec to 300 sec

0,1 sec to 12,5 sec at 10

Is

50N/51N(Low, Mid-

end solutions

/applications)

DT

IDMT

Is0 set point 0,1 to 15 In0

0,1 to 1 In0

Inst: 0,05 sec to 300sec

0,1sec to 10 Is0

4.1.4 Overload protection shall be based on RMS current value (Minimum 13th Harmonic) and shall take the

ambient temperature into account.

4.1.5 Phase over current and earth fault protection shall have an adjustable timer hold to allow re-strikingfault detection



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4.1.6 Earth fault protection shall integrate a H2 Harmonic restraint for transformer start-up inrush current to

be activated or inhibited

4.1.7 Differential protection shall integrate H2 and H5 Harmonic restraint to prevent a transformer nuisance

tripping during the energising period

4.1.8 Alternative over current setting groups shall be selectable by logical conditions through logic inputs, to

adapt a fast protection plan change as well as setting facilities for thresholds and time delay adjustment.

4.1.9 The Digital and protective Relay shall allow the use of upstream and logic discrimination in a

cascading scheme or closed loop applications.

4.2 Control and Monitoring

The Digital Protective Relay shall basically carry out all the ANSI code Control and Monitoring functions

necessary to control the Circuit Breaker or Contactor for electrical operations.

These operations shall be performed from pre-defined functions using logic inputs/outputs and shall beprocessed from internal and external data for:

4.2.1 Circuit breaker/Contactor control - ANSI 94/69

4.2.1.1 On/Off control whatever the type of tripping coil (shunt trip or under voltage release)

4.2.1.2 Inhibit tripping

4.2.1.3 Remote control

4.2.2 Latching /acknowledgement - ANSI 86

4.2.2.1 Latch individually all the tripping outputs and logic inputs

4.2.2.2 Used as Lock-out relay

4.2.3 Local annunciation - ANSI 30

4.2.3.1 LED indication (relay status)

4.2.3.2 Local annunciation on the relay display (events, alarms, messages)

4.2.3.3 Alarm processing

4.2.4 Logic discrimination - ANSI 68

4.2.4.1 Provide full tripping discrimination and faster tripping of circuit breakers close to the source in a

cascading scheme

4.2.4.2 Send and receive blocking orders between Protective Digital Relays of the cascading scheme

4.2.5 Setting groups Switching (normal to back-up mode network) with logic input

4.2.6 Output relay testing

Each output relay shall be activated for 5 seconds to check output connections and connected switch gear

operation

4.2.7 Automation functions

Mid and High-end Digital Protective Relay shall be able to provide specific control and monitoring functions

carried out with Logic Equations and/or Ladder Logic



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4.3 Metering

The Digital Protective Relay shall include accurate measurement processing functions and shall display the

metering data on the User Machine Interface to operate the different applications and carry out

commissioning and maintenance as per the following table (2):

Metering functions - Table 2-

Designation Low-end solutions /

Applications

Mid-end

solutions/

Applications

High-end

solutions/

ApplicationsCurrent or Voltage

Phase current I1, I2, I3 RMS

Calculated residual current I0

Demand current I1, I2, I3

Peak demand current IM1, IM2, IM3

Measured residual current I0, I0

Voltage U21, U32, U13, V1, V2, V3Residual voltage V0

Positive sequence voltage Vd/rotation

direction

Negative sequence voltage Vi

Frequency

Active power P, P1, P2, P3

Reactive power Q, Q1, Q2, Q3

Apparent power S, S1, S2, S3

Peak demand power PM, QM

Power factor

(P)

(Q)

(S)

Calculated active and reactive energy(Wh,VAR)

Active and reactive energy by pulse counting

(Wh,VAR)

Phase current I1, I2, I3 RMS

Calculated I0

Voltage U21, U32, U13, V1, V2, V3,

Vd, Vi and frequency

Residual voltage V0

Temperature

Rotation speed Neutral point voltage Vnt

Phasor diagram

4.4 Network, Machine and Switch gear diagnosis

The Digital Protective Relay shall provide diagnosis facilities for process management and maintenance

purpose as per table (3)

4.4.1Network diagnosis

The Digital Protective Relay shall provide network power quality metering functions and all data on detected

network disturbances to record, for analysis purpose.

4.4.2 Machine diagnosis

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For maintenance purpose the Digital Protective Relay shall provide data on the operation of the machines ,

predicted data to optimise process management, useful data to facilitate protection functions and

implementation

4.4.3 Switch gear diagnosis

The Digital Protective Relay shall provide information on switch gear mechanical status for preventive and

curative maintenance

Network, Machine, Switch gear diagnosis - Table 3 -

Designation Low-end

solutions /

Applications

Mid-end

solutions/

Applications

High-end

solutions/

Applications

Switch gear diagnosis

CT/VT supervision ANSI 60/60FL

Trip circuit supervision ANSI 74

Auxiliary power supply monitoring

Cumulative breaking current Number of operations, operating time,

charging time, number of racking out

operations

Network and Machine diagnosis

Tripping context

Tripping current Trip I1, I2, I3, I0

Phase fault and earth fault trip counters

Unbalance ratio / negative sequence current Ii

Harmonic distortion (THD), current andvoltage

Ithd, Uthd

Phase displacement 0, 0, 0

Phase displacement 1, 2, 3

Disturbance recording

Thermal capacity used

Remaining operating time before overload

tripping

Waiting time after overload tripping

Running hours counter / operating time Starting current and time

Start inhibit time

Number of starts before inhibition

Unbalance ratio / negative sequence Ii

Differential current I diff1, I diff2, Idiff3

Through current It1, It2, It3

Current displacement

Apparent positive sequence impedance Zd

Apparent phase-to-phase impedances Z21,

Z32, Z13

Third harmonic voltage, neutral point or

residual

Difference in amplitude, frequency and phase

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of voltages compared to for synchro-check

Capacitor unbalance current and capacitance

4.5 Relay diagnosis

The Digital Protective Relay shall contain self-test diagnosis facilities to:

4.5.1 Detect internal relay failures that may cause nuisance tripping or failed fault tripping

4.5.2 Set the relay in fail-safe position leading to a fall-back position to avoid any unwanted tripping if a

major internal failure is detected . A Watchdog relay with change over contact ( NO+NC) shall provide an

alarm or information to activate a back-up protection.

Any minor failure shall not interrupt the protection function operations and the relay shall operate in

downgraded mode

4.5.3 Inform for maintenance operation

4.5.4 Detect unplugged connectors resulting in a major internal failure

4.5.5 Check the hardware configuration

The absence or failure of a remote module shall be considered as a minor failure

The absence or failure of a Logic input/output module shall be considered as a major failure

4.6 Programming and configuration software

The Digital Protection Relay shall use a user-friendly setting and operating multi-lingual software in

Windows environment with menus and icons for fast direct access to the data required, guided navigation to

go through all the data on the same function together in the same screen and with a file management:

4.6.1 Prior to commissioning and without connection to the relay (unconnected mode), to prepare the relay

protection and parameter settings:

configure the relay and extension modules and entry of general settings

enable/disable functions and entry of general settings

adapt pre-defined control and monitoring functions

create specific mimic diagrams for local display

4.6.2 During commissioning , on a PC connected point-to-point to the front panel

access to all functions available in unconnected mode, after entering the protection settings or parameter

setting password

transfer of the relay parameters and protection setting file, prepared in unconnected mode, protected by te

parameter setting password

display of all the measurements and useful information during commissioning

display of logic inputs, logic outputs and LED status

test of logic inputs

display of automation variables

modification of passwords

4.6.3 During operation, on a PC connected to a set of relays via an E-LAN multi-point communication

network

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read relay protection and parameter settings, modifications following entry of protection setting or

parameter password

display the relay measurement data

display the time-stamped alarm messages

display the relay, switch gear and network diagnosis data

retrieve disturbance recording data

4.7 User Machine Interface

4.7.1 The Digital Protective Relay shall incorporate a User Machine Interface (or UMI) with an

alphanumeric graphical LCD and back-light display screen indicating:

- Measurement values

- Operating messages in major international languages (English native and local language) or shall accept

translation possibilities if not available in the basic relay

- System maintenance messages

4.7.2 The UMI shall display a clear information of alarm conditions.Signalling LED shall be available for alarms and status, including: Circuit Breaker position (open/closed),

relay self test, phase fault and earth fault alarms. The UMI shall accept specific LED assignments

4.7.3 The UMI shall enable to:

- Display metering and operating data, alarms and messages

- Clear alarms and resetting

- Access to protection and parameter settings

4.7.4 Access to setting mode shall be protected by two dedicated passwords of at least four digits: the first

password shall protect access to protection settings, the second one shall protect to parameter settings

4.7.5 The User Machine Interface shall be available as:

- Basic UMI including signalling and operating status LED

- Advanced integrated or remote UMI monitoring measurement data and messages for local equipment

operation

- Mimic-based UMI ( High-end application) with selection of control mode (remote, local, test), animated

mimic diagram

4.8 Communication

4.8.1 The Digital Protective Relay shall be communicating through one or two communication ports andintegratable in a communication architecture with information remote access.

It shall be able to be interfaced to two types of communication networks providing access to data on each

communication port, via:

- A multi-protocol based Supervisory Local Area Network (S-LAN) to supervise functions regarding the

installation and the electrical network from a supervision system (SCADA or RTU).

- Modbus based Engineering Local Area Network (E-LAN) to configure, set up the relay, collect operating

and diagnosis information, monitor the status of the electrical network and run diagnostics on electrical

network incidents from the programming and configuration software.

4.8.2 The Digital Protective Relay shall use appropriate communication protocols depending on whether the

relay interfaces an industrial process electrical network or a power substation of electrical distribution.- Modbus RTU, Field bus and Industry data transmission protocol, IEC 61158 foundation compliant,

through Twister-Pair cable RS 485 (2-wire or 4-wire) or Fibre Optic link.

- Modbus RTU through Twisted Pair cable RS 485 (2-wire or 4-wire), over Ethernet TCP/IP 10/100 Mbits

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Base Tx or Base Fx, through a multiple entry gateway (average 10 relays per gateway).

- IEC 870-5-103, a companion standard of IEC 870-5 series to communicate between the Digital Protective

Relay and the control system (Supervisor or RTU) inside a Utility power substation, through Twisted Pair

cable RS 485 (2-wire) or Fibre Optic link.

- DNP3, a data transmission protocol for remote control and monitoring of Utility power substations, IEC

870-5 series compliant, through Twisted Pair cable RS 485 (2-wire) or Fibre Optic link.

- IEC 61850 for Utility HV/MV Power Station Automation inside the substation through Ethernet 10//100

Mbits Base Tx or Base Fx , and Fibre Optic link, embedded in the relays or through a multiple entry

gateway.

4.8.3 The Digital Protective Relay and the Supervisor shall transmit operating data protected by password:

- Relay to Supervisor: metering and diagnosis information.

- Supervisor to Relay: remote-control orders.

4.8.4 The Digital Protective Relay shall provide:

- time-stamped events facilities regarding the status changes of all logic inputs and all remote indications totime-stamp event within one millisecond.

- time-setting and synchronisation facilities to ensure a long term stability or to co-ordinate a number of

relays to be synchronised by an external pulse to a dedicated logic input or via the communication link.

4.8.5 The Digital Protective Relay shall have remote setting possibilities to select protection-setting groups,

read general parameters, read protection settings remotely, write protection settings remotely to be inhibited

by parameter setting if needed.

4.8.6 The digital Protective Relay shall have network diagnostic information available, recorded in files, to

transmit over the communication link:

- disturbance-recording records in COMTRADE format according to IEC 60255-23.- tripping contexts.

- out-of-synchronisation context.

4.9 Digital Protective Relay hardware architecture platform

As per Annexes 7

5. Tender documents

To support its technical offer description, the bidder shall submit the following documents relative to the

Digital Protective Relay:

5.1 Relay architecture single line diagrams5.2 Technical data sheets

5.3 Catalogues

5.4 User manuals and installation guide

5.5 Test and conformity certificates

5.6 Reference lists for similar application

6. Protection relay testing , commissioning and maintenance

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6.1 Testing:

Digital protective relays shall be tested prior to commissioning in order to maximise availability and

minimising the risk of malfunctioning of the assembly being commissioned.

Because of the use of digital technology the relay shall guarantee the reproducibility of announced

performances over time and shall have undergone full factory qualification.

So the Protective Digital Relay shall therefore be ready to operate without requiring any additional

qualification testing that concerns it directly

6.2 Commissioning tests:

The preliminary relay commissioning tests shall be limited to a commissioning check:

6.2.1 Checking of compliance with bill of materials and hardware installation diagrams and rules during a

preliminary general check

6.2.2 Checking of the compliance of the general settings and protection settings entered with the setting

sheets

6.2.3 Checking of current or voltage input connections by secondary injection tests6.2.4 Checking of logic input and output connections by simulation of input data and forcing output status

All the tests shall be carried out with the MV cubicle completely isolated and the MV circuit breaker racked

out (disconnected and open)

All the test shall be performed in the operating situation with the parameter setting and operating software or

without software for relay with advanced UMI: no wiring or setting changes, even temporary changes to

facilitate testing shall be allowed.

6.3 Maintenance

The Digital Protective Relay shall not need any internal and specific maintenance over time, mainly for

parameter settings and after commissioning.

Nevertheless connections to the relay shall be checked preventively as well as the quality of output relay

contacts to ensure that tripping and closing coils are properly energised and all control logic orders are

properly transmitted .

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7. Annexes

7.1 Annex A1

Protection selection guide for Substation applications

ANSI

Codes

Designation Low-end solutions/

Applications

Mid-end solutions/

Applications

High-end

solutions/

ApplicationsCurrent Voltage

50/51 Phase over current

50N/51N

50G/51G

Earth fault/Sensitive Earth fault

50BF Breaker Failure 46 Negative sequence / unbalance

49RMS Thermal overload for cables

67 Directional Phase over current

67N/67NC Directional Earth Fault

32P Directional active overpower

37P Directional active under power

27D Positive sequence under current

27R Remanent over voltage

27 Under voltage (L-L or L-N)

59 Over voltage (L-L or L-N)59N Neutral voltage displacement

47 Negative sequence over voltage

81H Over frequency

81L Under frequency

81R Rate of change of frequency

79 Recloser (4cycles)

25 Synchro-check

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7.2 Annex A2

Protection selection guide for Busbar applications

ANSI

Codes


Applications

Mid-end solutions/

Applications

High-end

solutions/

Applications


50N/51N

50G/51G


50BF Breaker Failure

46 Negative sequence / unbalance




59 Over voltage (L-L or L-N)

59N Neutral voltage displacement


81H Over frequency

81L Under frequency

81R Rate of change of frequency

25 Synchro-check

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7.3 Annex A3

Protection selection guide for Transformer applications

ANSI

Codes

Designation Low-end solutions

/ Applications

Mid-end solutions/

Applications

High-end

solutions/

ApplicationsCurrent Voltage


50N/51N

50G/51G




49RMS Thermal overload for machines

64REF Restricted Earth Fault

87T Two-winding transformer

Differential




24 Over fluxing (V/ Hz)




59 Over voltage (L-L or L-N)



81H Over frequency

81L Under frequency

26/63 Thermostat/Buchholz

38/49T Temperature monitoring

25 Synchro-check

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7.4 Annex A4

Protection selection guide for Motor applications

ANSICodes

Designation Low-end solutions/Applications

Mid-end solutions/Applications

High-endsolutions/

Applications


50N/51N

50G/51G





87T Two-winding transformer

Differential

87M Machine differential



32Q/40 Directional reactive overpower

40 Field loss (under impedance)

37 Phase undercurrent

48/51LR/1

4

Excessive starting time, locked

rotor

66 Starts per hour

78PS Pole slip 12 Over speed (2 set points)

14 Under speed (2 set points)




59 Over volatage (L-L or L-N)



81H Over frequency

81L Under frequency 26/63 Thermostat/Buchholz


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7.5 Annex A5

Protection selection guide for Generator applications

ANSI

Codes

Designation Low-end solution

/ Application

Mid-end

solution/

Application

High-end solutions/

Applications


50N/51N

50G/51G





64REF Restricted Earth Fault 87T Two-winding transformer

Differential

87M Machine differential




32Q40 Directional reactive overpower

37P Directional active under power

40 Field loss (under impedance)

78PS Pole slip 12 Over speed (2 set points)

14 Under speed (2 set points)

50V/51V Voltage-restrained over current

21B Under impedance

50/27 Inadvertent energization

27TN/64G

2

64G

Third H3 Harmonic under

voltage/100%stator Earth Fault

24 Over fluxing (V/ Hz)

27D Positive sequence under current 27R Remanent over voltage


59 Over voltage ( L-L or L-N)



81H Over frequency

81L Under frequency

26/63 Thermostat/Buchholz


25 Synchro-check

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7.6 Annex A6

Protection selection guide for Capacitor applications

ANSI

Codes


Applications

Mid-end solutions/

Application

High-end

solutions/

Applications


50N/51N

50G/51G




49 RMS Thermal overload for capacitors

51C Capacitor bank unbalance 24 Over fluxing (V/ Hz)




59 Over voltage ( L-L or L-N)



81H Over frequency

81L Under frequency


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7.7 Annnex A7

Digital Protective Relay hardware architecture platform

Designation Low-end solutions

/ Applications

Mid-end

solutions/

Applications

High-end

solutions/

ApplicationsCurrent or Voltage

Main analogue inputs:

Phase current: I1, I2, I3

Residual current: Io

Phase voltage: V1, V2, V3

Residual Voltage: Vo

Additional analogue inputs ( differential protection)

Phase current: I1, I2, I3

Residual current: Io

Phase voltage: V1, V2, V3

Residual Voltage: Vo

User Machine Interface (UMI)

Basic UMI

Advanced UMI

integrated

remote Mimic-based UMI

Removable memory cartridge

Back-up battery

Communication ports

Logic relay outputs

Additional Logic inputs/outputs

Outputs

Inputs

Temperature data inputs

Analogue Output

Synchro-check (Load sharing)

Multi-protocol Communication

Programming and configuration local /remote

software

(3)

(1)

(1)

(4)

( 4)

(10)

( 8)

( 1)

(3)

(1)

(1)

(4)

( 4)

(10)

( 8)

( 1)

(3)

(1)

(3)

(1)

(1)

(4)

( 4)

(10)

(16)

( 1)

(3)

(1)

(3)

(1)

(3)

(1)

(3)

(1)

(2)

(5)

(18)

(42)

(16)

(1)

Last update : 2006-04-jj - 22 -


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Digital Protective Relays Spec En

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