Specification for Tender Digital_Protective_ Relays_spec V1.doc
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
Last update : 2006-04-12 - 22 -
Specification for Tender Digital_Protective_ Relays_spec V1.doc
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 manufacturer
2.1 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 engineer’s 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 his commitments 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) hour’s notice.
The engineers employed by the supplier’s 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.
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)
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 60255-22-4
IEC 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
III
A and B
IV
III
Environmental Mechanical constraints / In operation
– vibrations
– shocks
– earthquakes
De-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
– 1.2/50µs impulse wave
– dielectric at network frequency / IEC 60529
NEMA
IEC 60695-2-11
IEC 61131-2
IEC 60255-5
IEC60255-5, ANSI C37.90 / IP52
Type 12
Climatic conditions / In operation
– to cold
– 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 61068-2-1
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 / Ad
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 electrical installations / 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 a hardware 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 l Failure Rate and a useful life time of the digital relay.
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.
3.3 Digital Protective Relay general and practical operating requirements
The Protective Digital Relay shall operate according to the following conditions:
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 CT’s or interposing ring CT
Voltage sensors: / 100V, 110V, 100V/ Ö3, 110V/Ö3 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 withdrawing current 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.
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 current and directional Phase, Earth fault applications or revamping
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 solutions/applications) / 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 solutions/applications) / 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.