3.3kV Essential Services Distribution System

Transcription

1 Engineering Specification Head of Engineering Electrical L1-CHE-SPE kV Essential Services Distribution System Version: 1 Issued: July 2016 Owner: Head Of Engineering Electrical Approved By: Phil Ellingworth Chief Engineer PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION

2 Approval Amendment Record Approval Date Version Description 13/07/ Initial issue PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 2 of 33

3 Table of Contents 1 Purpose Scope Abbreviation Definitions References & Legislations General MTM Standards/Documents Rail Industry Standards/Documents Australian Standards/Documents International Standards/Documents ESDS Asset Class Considerations System Requirements Designated Essential Services Devices and Other Electrical Services System Architecture Architecture Low Voltage Supply to Non Designated Essential Services ESDS System Electrical Operations UPS Synchronisation kV Reticulation Electrical Operation Transition from Existing 2.2kV, 1.0kV and 650V Reticulation System Earthing and Bonding Choice of ESDS Earthing System Railway 1500VDC System Earthing Design CER Earthing Requirements DTRS Earthing Requirements SER Earthing Requirements Vic Track Communication Equipment Requirements Railway Station Earthing Requirements Lightning Protection Insulation Co-ordination Protection Co-ordination Environmental and Climatic Conditions System Parameters Specific ESDS Power Supply Requirements ESDS Distribution Reticulation Design Signal Power Supply PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 3 of 33

4 10.3 SER Power Supply CER Power Supply Vic Track Power Supply Railway Station Power Equipment and Installation General Specifications Trackside 3.3kV Signal Equipment Location Inspection and Testing Documentation General Design Process Operation and Maintenance Manual Design Documentation Technical Maintenance Plan Appendices Appendix A - Essential Services Distribution System Single Line Diagram Appendix B - Substation Essential Services Single Line Diagram Appendix C - Design Deliverables Appendix D - Designated ESDS Devices PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 4 of 33

5 1 Purpose This document details the requirements for the 3.3kV Essential Services Distribution System sourced at and distributed between railway substations within the Infrastructure Lease for the supply of the signalling system, communications systems and other electrical systems as defined in L1-CHE-STD Scope This Specification shall be applied to all new infrastructure and major upgrades of infrastructure which includes Essential Services. This Specification describes the functional and design requirements for the Essential Services Distribution System. A reliable power supply distribution system is fundamental to the operation of the signalling, communication and other systems within the railway and hence to the on-time running of train services. This document describes the technical requirements for an essential services power supply system to provide the required high level of safety and reliability. For contract works, this document shall be read in conjunction with the particular specification, which refers to it. As per L1-CHE-STD-015 where the complexity of the signalling apparatus and the particular project parameters prohibit the full introduction of the Essential Services Distribution System, a compromise as described is to be put in place. The detailed requirements shall be as stated in Form MEMF Electrical Networks Functional Requirements. I. The change from the existing 2200V, 1000V or 650V systems to the new 3.3kV system may be made progressively over many years. As a transition plan, with the upgrading of the signalling power supply locations, all equipment installed shall conform to that for the future, being the 3.3kV three phase system with UPS backup. II. Where necessary, the output of the 3.3kV three phase system shall be transformed to provide a single phase supply to the Signal Zone Boxes. The supply shall be in phase with the existing system. The detailed requirements shall be as stated in Form MEMF Electrical Networks Functional Requirements. This specification supersedes the relevant clauses in VRIOGS 12.1 and Where any conflict in the requirements exists, the Head of Engineering - Electrical or Head of Engineering - Signals as appropriate, shall make a direction on the issue. 3 Abbreviation ACCB CBI CCTV CER DCCB Alternating Current Circuit Breaker Computer Based Interlocking Closed Circuit Television System Communications Equipment Room Direct Current Circuit Breaker PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 5 of 33

6 DTRS PTV FLS ESDS ESAT kv SCADA SER UPS V Digital Train Radio System Public Transport Victoria Field Lan Switch Enclosure Essential Services Distribution System Essential Services/Auxiliary Transformer Kilovolt Substation Control and Data Acquisition System Signal Equipment Room Uninterruptable Power Supply Volt 4 Definitions Shall Should Standard Designated Essential Services Devices Non Designated Essential Services Devices Is used as the descriptive word to express a requirement that is mandatory to achieve conformance to the standard. Is used as the descriptive word to express a requirement that is recommended in order to achieve compliance to the standard. Should can also be used if a requirement is a design goal but not a mandatory requirement. A set of high level requirements that are mandatory to be adhered to achieve MTM s objectives. Designated Essential Devices means the devices, apparatus and systems to be supplied by the Essential Services Distribution System as listed in clause 18.2 of L1-CHE-STD-015 and also the items listed in Appendix D. Devices means the devices, apparatus and systems to be supplied which are neither a designated Essential Services Device or a Safety Service Safety Services As defined in Clause and 7.2 of AS/NZ References & Legislations 5.1 General Reference to all standards shall be read as a reference to the latest edition of that standard and amendments available at the time of tendering. The ESDS shall meet all relevant Environmental Acts, Legislation and Regulations, Codes of Practice and Standards, and shall be designed to minimise the impact on the environment. Accordingly the ESDS shall minimise its environmental impact over its entire asset life cycle, including construction, ongoing operation and disposal. In particular, MTM has a focus on reduced electrical losses in its electrical systems. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 6 of 33

7 5.2 MTM Standards/Documents Document Number MEST MCST MEMF MCST L4-CHE-INF-002 L1-CHE-STD-010 L1-CHE-STD-016 Title Traction Substations And Tie Stations Metropolitan Railway Stations Electrical Networks Functional Requirements Lighting and Power Design and Construction Standard Product List Electrical Networks Standard Railway Bridges Electrical Protection And Bonding Track Bonding For Signalling And Traction Return Current Various Equipment Specifications Refer Section 11.1 L1-CHE-STD-015 L1-CHE-STD-009 L1-SDD-STD-006 Electrical Networks Principles And Performance Traction Substations And Tie Stations Train Maintenance Buildings Electrical Systems Earthing And Bonding Draft Communications Equipment Room Standard 5.3 Rail Industry Standards/Documents Document Number IPGOR -01 VRIOGS VRIOGS Title PTC Train Infrastructure Electrical Safety Rules (High Voltage Rules) Standard for Signalling Design and Documentation Specification for Signalling Supply, Construction and Installation 5.4 Australian Standards/Documents Document Number AS/NZS 3000 Title Wiring Rules 2007 Electrical Installations N/A Electrical Safety (Installations) Regulations 2014 S.R. No. 164/2009 Electrical Safety Regulations 2009 S.R. No. 151/2009 Electricity Safety (Cathodic Protection) Regulations 2009 AS AS Current Transformers Instrument Transformers PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 7 of 33

8 AS 2067 AS 1824 AS 4436 AS 2650 AS AS/CA S009 AS/NZS 3015 Substations And High Voltage Installations Exceeding 1kv A.C. Insulation Co-Ordination Guide For The Selection Of Insulators In Respect Of Polluted Conditions Common Specifications For High Voltage Switchgear And Control Gear Standards High-Voltage Switchgear And Control Gear Installation Requirements For Customer Cabling (Wiring Rules) Electrical Installations-Extra-Low Voltage D.C. Power Supplies And Service Earthing Within Public Telecommunications Networks 5.5 International Standards/Documents Document Number EN :2011+A1 EN : 2010 IEC Complete Series Title Railway Applications. Fixed Installations. Electrical Safety, Earthing And The Return Circuit. Protective Provisions Against Electric Shock Railway Applications. Fixed Installations. Electrical Safety, Earthing And The Return Circuit. Provisions Against The Effects Of Stray Currents Caused By D.C. Traction Systems Low-Voltage Electrical Installations 6 ESDS Asset Class Considerations The design of the ESDS shall consider minimising the whole-of-life cost. The designer and/or manufacturer shall provide the following information: Cost of changes to the Technical Maintenance Plan & Service Schedules or the creation of new manuals & schedules; Cost of decommissioning and disposal; Cost of installation; Cost of inventory spares; Cost of maintenance; Cost of manuals; Cost of modifications to other parts of the installation; Cost of replacement parts; PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 8 of 33

9 Cost of special tools; Cost of staff training; Discount rate; Electrical losses; Environmental costs; Initial purchase price; Lifetime of equipment; and Reliability and cost of consequential damage after failure. 7 System Requirements 7.1 Designated Essential Services Devices and Other Electrical Services Apparatus to be supplied from the ESDS are listed in Appendix D. The designated essential service devices are so specified to overcome the previous problems where there were up to three different supplies for such equipment, in particular at SERs. The objective of the single ESDS is to provide a highly reliable electrical supply to the subject systems. The system design shall ensure that the reliability targets set by PTV are met. L1-CHE-STD-015 Electrical Networks Principles and Performance specifies that all other loads at Stations including safety services shall be supplied from an external power company supply. The earthing and bonding strategy at the ESDS to the external power company interface shall be provided to the Head of Engineering - Electrical for approval (refer Section 7.6). 7.2 System Architecture The ESDS shall consist of a three phase 3.3kV reticulation system fed from at least two substations, the general configuration of which is shown in Appendix A. All 3.3kV ACCB switchboards shall be contained in power equipment rooms when part of a substation, station, SER or other building. When the ACCB switchboard is required to be contained in its own enclosure, such as at trackside location boxes, then it shall be housed within a stainless steel enclosure, as detailed in L1-CHE-SPE-150. The ESDS comprises of: Substation Architecture The system shall be supplied from an ESAT which typically would be a 100kVA, 3Φ, 22kV/400V Dyn11 transformer. The ESAT will then feed a 400V three phase supply which is connected to a UPS from the 400V switchboard. The UPS shall be a dual conversion type (3Φ 400V input/3φ 400V output) with static and manual bypass switches, as shown in Appendix B. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 9 of 33

10 The UPS shall feed a 3Φ 400V/3.3kV Dyn1 transformer, yielding a 3.3kV supply in phase with the 22kV distribution system. The 3.3kV supply shall be connected to an ACCB switchboard with an incoming ACCB and the appropriate number of feeder ACCBs, which is normally two. The ESDS distribution section between two Substations will generally be normally fed from the up side Substation. Trackside Reticulation The three phase 3.3kV supply shall be reticulated via an underground three core cable, from the Substation, to trackside ring main switchboards, located at the ESDS power distribution locations. The reticulation shall be installed as detailed in L1-CHE-SPE-070. The trackside ring main unit enclosure shall also house a step down transformer, LV circuit protection and cable fault locator units. Each line side supply point shall be regarded as a separate location with remote control and indication of the apparatus at that location. Signal Zone Box Signal Zone Boxes shall be distributed via a ring main unit, containing a 3.3kV/110V transformer and 110V Switchboard. SER SERs shall be supplied from the ESDS via a ring main switching unit. From the ring main switching unit, a 3.3kV/ V transformer shall supply a 400/230V essential services bus, which will in turn supply the main 110V field signal equipment switchboard from a V/110V transformer. Any CER or Vic Track equipment; CBI UPS and general Light and Power shall be fed from the 400/230V essential services bus. DTRS Facility The DTRS facility shall be supplied via a ring main ACCB unit housed in an enclosure separate to the equipment hut, which shall also house a 3.3kV/ V transformer and switchboard. CER / Vic Track Communication Room Vic Track Communications Rooms and CERs shall be supplied from the ESDS. Where a separate Vic Track Communications Room or CER exists then a ring main switching unit shall supply a 3.3kV/ V transformer which shall supply the Vic Track / CER UPS and the associated light and power required for the room. The 3.3kV/ V transformer shall be housed separately to the CER and/or Vic Track Communications Room. If a CER or Vic Track Communications Room is located together with another CER or Vic Track Communications Room, or a station or SER, they shall be supplied from the same 400/230V Essential Services bus. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 10 of 33

11 Railway Stations The station designated essential services shall be supplied via a 3.3kV ring main unit housed in a dedicated power equipment room or enclosure. This shall include a 3.3kV/400V transformer supplying a 400V Essential Services switchboard. There shall be strict separation of the power company and the essential services earthing systems. 7.3 Architecture Low Voltage Supply to Non Designated Essential Services The non-designated ESDS loads at railway stations shall be supplied from a low voltage 400V/230V power company supply via an isolating transformer. If the load is substantial then a standalone kiosk substation could be used where the main HV/LV transformer may act as an isolating transformer The 400V/230V supply to non-designated essential services including safety services, which will predominately be at Railway Stations, shall be supplied from the external power company supply. The earthing and bonding scheme shall ensure effective isolation between the power company supply and 400V/230V supply to the non-designated essential services loads. 7.4 ESDS System Electrical Operations UPS Synchronisation The Electrical Network Control Centre Electrol will remotely control the ESDS Distribution System. The electrical operation of the ESDS shall be based on the following principles: Switching of the ESDS shall involve closing the alternate supply circuit breaker, and subsequently opening the previous supply circuit breaker, with a short period of parallel operation to prevent a loss of supply. Paralleling of UPS supplies shall only occur when the UPS output is synchronised and in phase with the portion of the ESDS with which it is to be paralleled. A synchronising signal shall be able to be provided to the UPS. The synchronising signal shall be provided via a Load Bus Synchronisation Unit. A synchronisation signal from the line side of at least two ESDS feeders at the substation shall be input into the Load Bus Synchronisation Unit from which the signal can be selected, based on the switching arrangement in place. Alternatively a remote synchronisation signal may be provided electronically using optic fibre communications. All operating scenarios and switching arrangements including normal, one UPS out of service, a UPS feeding outwards in all directions and end of line sections shall be considered, and synchronisation provided to enable sufficient reliability and redundancy in each scenario. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 11 of 33

12 kV Reticulation Electrical Operation The Essential Services Distribution, including the trackside signal box location boxes shall be capable of being sectionalised by remote control into individual feeders, zones and supplies to separate devices to ensure continuity of supply and facilitate maintenance of the electrical assets. The sectionalising shall be such as to permit switching of the system to energise or de-energise apparatus as required but to also ensure that the signalling power supply system and other supplies remain supplied as required A cable fault indicating device shall be fitted to each load side point of a Substation or 3.3kV ring main switching unit. This is to enable Electrol to effectively locate a cable fault and undertake switching around the cable fault. 7.5 Transition from Existing 2.2kV, 1.0kV and 650V Reticulation System All new substations or at substations where major upgrades are occurring, an ESDS UPS shall be placed into service. If a UPS is to be installed in an area with a 2.2kV single phase signal distribution system, a three phase input shall be provided to the UPS, and a three phase 400V/2.2kV step up transformer connected to the output, with only two phases of the step up transformer to be connected to the 2.2kV distribution network, as shown in Appendix B. If a UPS is to be installed in an area with a three phase 1.0 kv single phase signal distribution system, the output of the UPS shall be connected to a three phase 400V/1.0kV step up transformer with 0 phase shift to ensure the appropriate phase relationship. If upgrade works are occurring in areas which have 650V or individual 230V street supplies, then the complete section or parts thereof shall be converted to 3.3kV reticulation. The following transitional requirements shall be made where new or major works are occurring between two or more existing trackside switching locations, which are at 2.2kV or 1kV: The interconnecting cables shall have three cores and be adequately rated for 3.3kV reticulation, in terms of voltage, current carrying capacity, general specifications and earthing configuration. The installation shall meet the requirements of L1-CHE-SPE-070. Trackside switchgear which meets the requirements of L1-CHE-SPE-150 shall be installed. All three phases of the reticulation cable shall be terminated onto the trackside equipment, with the unused phase having a suitable insulating cap placed over its termination. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 12 of 33

13 7.6 Earthing and Bonding Choice of ESDS Earthing System The Designer shall specify the earthing system, as allowed in Section of AS/NZS 3000, stating clearly how Part 1 of AS/NZS 3000 is satisfied taking into account any effects on the distribution network supplying the system. For the power distribution system to meet the requirements of Section 5.3 of AS/NZS 3000, the system shall meet IEC As such the type of earthing system shall meet the requirements of Section of IEC and be specified in accordance with the codes T, I, N, C and S. All signalling supplies shall be connected between phases and shall have no connection to earth to maintain circuit integrity and safety in the event of any individual earth fault. The method of neutral grounding of the ESDS system shall be specified from one of the following schemes high impedance-earthed neutral, resistance earthing (High or Low) reactance earthing The criterion for the earthing scheme should consider: Meeting AS/NZS 3000 Elimination of electric-shock hazards to personnel caused by stray groundfault currents in the ground-return path. Elimination of burning and melting effects in faulted electric equipment, such as switchgear, transformers, cables, and rotating machines. Elimination of mechanical stresses in circuits and apparatus carrying fault currents. Continuity of supply Elimination of the arc blast or flash hazard to personnel who may have accidentally caused or happen to be in close proximity to the ground fault. Elimination of the momentary line-voltage dip occasioned by the occurrence and clearing of a ground fault. Elimination of transfer of ground earth potentials Stray current is always present in varying degrees in and adjacent to the rail corridor, thus making it a potential corrosive environment. In order that current isn t transferred externally it is always necessary to electrically isolate all metal pipes and the like which cross or enter the rail corridor boundary and shall form part of the management plan. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 13 of 33

14 An integrated earthing and bonding management plan shall be provided. A bonding and earthing single line diagram shall be provided as part of this, to detail all the earthing and bonding which will form the ESDS earthing system, from 22kV/11kV supply through to the end loads such as point machines on the signalling system and communications equipment on the ESDS LV supply. The designer shall consider all earthing and bonding interfacing to the earthing and bonding management plan including but not limited to: Railway negative system (to the requirements of EN 50122) Meet the requirements of L1-CHE-STD-016, Track Bonding for Signalling and Traction Return Current Local power company electrical supplies Traction Substation Earthing UPS earthing Earthing of signal location boxes Earthing systems used in CER, SER and railway stations Earthing of cable screens At railway stations: canopies, steel stanchions and structures, metallic fences, light poles, mechanical services ductwork, mechanical services pipe work, fire and hydraulics pipe work, architectural steelwork, structural steelwork, lift guide rails, steel reinforcing, all mechanical services and any other structural steelwork Railway Bridges, in accordance with L1-CHE-STD-010, Railway Bridges Electrical Protection And Bonding Train Maintenance Buildings, in accordance with L1-SDD-STD-006, Train Maintenance Buildings Electrical Systems Earthing And Bonding All instances of the 3.3kV Essential Services Distribution System should utilise the same earthing scheme Railway 1500VDC System The running rails and associated negative system are not connected to structure earth or earth. The earthing scheme shall take into account any ESDS equipment located in the overhead contact line and pantograph interference zones in accordance with EN A voltage limiting device shall be considered for connection between the railway negative system and the earthing systems in accordance with EN PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 14 of 33

15 7.6.3 Earthing Design An integrated High Voltage Earthing System for the ESDS shall be designed. The Earthing System design shall consider all the requirements of AS2067, ENA s EG0 and EG1 guidelines and EN and EN The Earthing System shall be capable of handling the full design fault current for the ESDS. Prior to the detailed earthing design a full condition assessment report of the site shall be provided to determine the performance of the earthing system. The condition assessment report is to include a current injection test which is to be a low current power frequency test into any existing earthing system. The report shall include but not limited to: Earth potential rise for worst case faults Step and touch potentials Transfer voltages to adjacent metallic structures Inspection of the condition of the existing earth mat Soil resistivity Current distribution The overall Earthing System design shall consider: The termination of HV supply cable screens The interaction of the Earthing System and the adjacent Rail System in response to an Earth Potential Rise (in particular the signalling system and level crossings) The safety of HV Operators whilst working on or near the ESDS and in its environs The safety of the General Public and other MTM employees whilst in the Substation environs Reducing the prospective Step and Touch Potentials within and around the Substation to values considered safe for approach by Humans The integration of an existing Earthing System with the new Earthing System The bonding of fencing and metallic objects around the ESDS (or deliberate non-connection of metallic structures) The bonding of cable trays and metallic structures within the ESDS The reticulation of power to the ESDS loads Soil resistivity models in the area around the ESDS The lightning protection and earthing requirements of the DTRS facility The earthing requirements of the CCTV system including the Field LAN Switch (FLS) enclosures installed throughout the site and remote from the CER. Earthing modelling shall be performed on recognised computer modelling software. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 15 of 33

16 CER Earthing Requirements The CER shall be provisioned with an earthing system design that shall consider all the requirements of: Provision for earth bonding to meet AS/NZS 3015 and AS/CA S009. Provision of lightning protection and surge filtering on the incoming room supply. Particular consideration shall be taken for the installation of Field LAN Switch (FLS) enclosures throughout the site and remote from the CER that are housed in metal enclosures with the DC supply (-48V, positive earth) and earth from the CER connected to the metal enclosure. DTRS Earthing Requirements The DTRS facility shall be provisioned with an earthing system design that shall consider the requirements of: Provision for earth bonding to meet AS/NZS 3015 and AS/CA S009. Provision of lightning protection and surge filtering on the incoming room supply. SER Earthing Requirements SER and Zone Boxes earthing arrangement shall be installed as per standard drawings STD_G0009 and STD_G0010. Where earth leakage detectors are installed, a separate test earth shall be installed. Vic Track Communication Equipment Requirements The earthing arrangements for Vic Track communications equipment is to comply with AS/NZS 3000 (earthed neutral AC supply) and AS/NZS 3015 (sec. 4), and shall include a copper earth bar meeting the following requirements: A minimum cross sectional area of 150mm2. A minimum of 10 x M10 holes. Mounted to the wall using 35mm stand-off insulators. Connected to the main earth bar of the site via a 35mm2 insulated green/yellow copper conductors. Connected to the CER switchboard via a Bonding Terminal using 16mm2 insulated green/yellow copper conductors. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 16 of 33

17 7.6.8 Railway Station Earthing Requirements The earthing and bonding scheme for a railway station shall be integrated into the overall ESDS earthing and bonding scheme as per The non-designated ESDS electrical supply system of the railway station supplied from the power company shall ensure the MEN system of the local supply shall not be allowed to pick up DC leakage current. The recognised method of achieving this is to ensure the earth and neutral of the MEN supply is physically isolated from any part of station earthing and bonding. A TN-CS system shall be used, in accordance with AS/NZ 3000 and IEC for the station non-designated lighting and power load such as lighting. The overall station earthing and bonding strategy shall utilise an equipotential zone for the station which is isolated from the power company earthing and also is isolated from the railway negative system. The use of a 400V/ V isolating transformer to separate the local Electricity Distributor s MEN earth and neutral shall be used when an LV power company supply exists. All 400/230V supplies within the station shall be configured as MEN systems. The ESDS derived supply and power company derived supply should have a common earth bar, neutral bar and MEN link as shown in Figure 1. The earthing and bonding report shall consider the suitability of this arrangement. 3.3kV ESDS Bus Power Company Supply 3.3kV/400V 400V/400V or 22kV/400V etc. Transformer enclosure protective earth Transformer enclosure protective earth Neutral Bar MEN Link 400V Essential Services Bus Common Earth Bar Station Earth 400V Non-Essential Services Bus Figure 1: Typical Station Earthing Arrangement PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 17 of 33

18 Where a dedicated power company supply is obtained for the station, the HV/LV transformer may be used as the isolating means. The power company transformer shall not be used to supply other consumers outside the station equipotential zone. Suitable signage shall be provided to ensure the power company earth and station earths are not bridged. Items outside the station equipotential zone (but supplied from the station), such as car park lighting and communication equipment will require a local isolation transformer. In terms of communication equipment fibre optic cables can be used for connection outside the equipotential zone. Alternative schemes may be utilised if approved by the Head of Engineering Electrical. Earthing and bonding of stations shall include consideration of overbridges and other structures. Particular consideration shall be taken for the installation of Field LAN Switch (FLS) enclosures throughout the site and remote from the CER that are housed in metal enclosures with the DC supply (-48V, positive earth) and earth from the CER connected to the metal enclosure. 7.7 Lightning Protection A complete lightning protection system to AS 1768 shall be provided for the ESDS (inclusive of the requirements for the DTRS facility) for the protection of persons and property from hazards arising from exposure to lightning. This shall include a report explaining the basis for the design and specify the type and model of the proposed lightning arrestors. 7.8 Insulation Co-ordination A complete insulation co-ordination study for the ESDS system shall be provided in accordance with AS and AS The procedure outlined in AS shall be used for the insulation co-ordination study. The ESDS shall be divided into subsystems which have the same insulation levels, including 3.3kV substation supply, trackside distribution, Signal Zone Boxes, CER room, SER room, DTRS Facility, Vic track Equipment Room, and Railway stations, Car parks, Train Stabling Yards and Maintenance facilities. The insulation co-ordination study shall take into account the adequate discrimination of insulation levels between each of these subsystems. The insulation level shall be chosen according to the established highest voltage for equipment and impulse withstand voltage. The level of insulation will be increased if required because of the method of neutral earthing. The choice of insulation level shall be based on rated lightning impulse withstand voltages and rated short duration power frequency withstand voltages. The insulation co-ordination study shall also consider the following for each subsystem: Maximum continuous overvoltages Temporary overvoltages PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 18 of 33

19 Switching overvoltages Lightning overvoltages Phase to ground voltage Basic Insulation Level Power Frequency, Flashover voltage Margin of Protection The designer shall specify (by manufacturer and part number) the required protection devices including lightning arrestors. surge suppression and other devices to ensure the required insulation levels within each subsystem are adequately maintained with the requirements of the insulation co-ordination study. 7.9 Protection Co-ordination The design of protection for the ESDS power system shall consist of the following steps: General Scheme Design Protection Co-ordination Study The General Scheme Design shall comprise of a report which includes but not limited to: a) The proposed protection scheme philosophy including the primary and any back up protection functionality. This shall include the method of protection against phase to phase and phase to earth faults. The use of protection devices such as cable fault detectors shall be specified. b) A Protection Block Diagram of the recommended protection scheme, using the main single line diagram and detailing each of the recommended protection relays, protection function numbers, connection of CTs and VTs to each protection relay and the tripping relationship between each protection relay and associated circuit breaker. c) Other interface issues to the existing electrical system including existing protection systems at each Substation. The Protection Co-ordination Study shall comprise a report which includes but not limited to: a) A time-current coordination analysis. The analysis shall be performed with the aid of computer software intended for this purpose, and shall include the determination of settings, ratings, or models for the overcurrent protective devices recommended b) Protection co-ordination shall be demonstrated between all the protection zones and with external power company equipment c) Single Line Diagrams, which includes all the data required for the report as for example, type and rating of protection devices, associated current transformers, line impedances, short circuit currents and maximum loads d) A sufficient number of computer generated plots shall be provided to indicate the degree of system protection coordination by displaying the time-current characteristics of series connected overcurrent devices and other pertinent system parameters. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 19 of 33

20 e) The study shall include a separate table containing the suggested device settings of all the protection relays f) A discussion section which evaluates the degree of system protection and service continuity with the recommended protection relays, along with recommendations as required for addressing system protection or device coordination issues. g) Current Transformer ratios and ratings and confirmation that the nominated relay will be compatible with the CTs and VTs h) Full list of assumptions and input data used for the protection study The ESDS system shall be broken up into protection zones, with a primary protection device, and if upon its failure a backup protection device to cover its protection zone. The protection schemes shall be designed to eliminate or manage blind spots. Fault clearing times shall be minimised. The protection shall be graded to ensure that the fault is cleared by the protection closest to the fault, and the area of interruption is minimised. Protection current transformers shall be connected to protection equipment only. All protection CTs shall comply with AS CTs shall be rigidly clamped to prevent movement under short circuit conditions. They shall be provided with rating plates and terminal markings as specified in AS The rating plates shall be mounted in such a manner that they are visible, and the secondary terminals shall be readily accessible. Duplicate rating plates shall be mounted in the instrument compartment with connection diagram. Voltage transformers shall be manufactured and tested in accordance with AS Environmental and Climatic Conditions Installations, including all devices and auxiliary equipment that form an integral part of them for the ESDS shall be designed for operation under the climatic and environmental conditions detailed in AS 2067, except that the maximum ambient temperature is 50 C as required by Clause of AS 2067, or higher if appropriate for the particular installation. Additionally, the air shall be classed as pollution level III heavy (refer AS 4436) as required by Clause of AS PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 20 of 33

21 9 System Parameters The ESDS shall meet the parameters detailed in Table 1. Table 1 ESDS System Parameters Parameter Value Unit Nominal System Voltage (phase to phase) 3.3 kv Primary Voltage Range +10 / -6 % Nominal Frequency 50 Hz Highest Voltage 3.6 kv Standard Short Duration Power Frequency Withstand Voltage (Table 2 AS ) Standard Lightning Impulse Withstand Voltage (Table 2 AS ) 10 kv 40 kv 10 Specific ESDS Power Supply Requirements 10.1 ESDS Distribution Reticulation Design The designer shall specify all the ESDS loads, including signalling, station and other loads such that the capacity of the ESAT can be specified The capacity of the Substation power supply shall be determined by: Provision by the signal system designers of the actual number of power supply locations, including SERs required for the signalling system, the distribution feed locations, the power rating of each transformer and the distribution design. Provision by the Train Station designers of the required loads, including maximum demand for the railway stations for designated ESDS supply. Provision of CER loads and Vic Track loads by Operational Control System designers including maximum demand. A provision of 20% additional loading shall be made. The minimum sizing of equipment shall be a 100kVA ESAT and 60kVA UPS. The size of the UPS shall increase in 60kVA modules. The rating of the UPS shall take into account the additional loading on two phases if feeding to an existing 2.2kV reticulation system. The LV outputs of the ESDS shall remain in phase with the 22kV source supply. In particular where the ESDS interfaces to signalling phase-sensitive equipment, the individual circuits shall be designed to maintain the correct phase of supply. Particular care shall be taken with AC track circuits, AC line relay circuits, searchlight signal circuits, and where changeover to an alternative supply occurs. The total loading of all locations shall be allocated equitably between phases. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 21 of 33

22 Reticulation of the ESDS shall not occur via poles and aerial conductors or suspended cable. The completed mains reticulation design shall be submitted for approval including the following information: a) A mains distribution plan, showing the completed distribution scheme. b) Location loading sheets, showing the details listed in the section above. c) Voltage drop calculation sheets, showing how the estimated voltage drops were calculated. The completed mains reticulation design should be submitted on a copy of the track plan/s for the project, bearing the following information: Feed location details (diagrammatically, using standard symbols), showing: o o o o Cable details: o o Sources of supply Emergency changeover equipment Surge protection 10.2 Signal Power Supply Simplified distribution switching Active and Common cables Identification of cable function Signalling supply at all trackside load points shall be nominal 110V AC, single phase two wire supply. The power supply reticulation system shall be designed to meet the following voltage drop criteria, under the defined load conditions: a) The maximum end to end voltage drop shall not exceed 10% for static and dynamic loads combined taken from the Substation ESDS 3.3kV bus to the 110V bus. b) Item (a) shall be met with the normal ESDS feeding arrangement as well as the backup feeding arrangement. The backup feeding arrangement may consist of feeding from one substation, past the next and up to the third substation in one direction. c) An allowance of 20% of the calculated load shall be applied for future load expansion The designer and installer shall ensure that any new or modified mains supply and distribution system will meet the specified requirements for voltage drop under all static and transient load conditions, with an adequate reserve capacity for future additions The reticulation design shall be submitted to the Head of Engineering - Electrical and Head of Engineering - Signals for approval and shall include detailed calculations of each of the following loads: PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 22 of 33

23 Static Loads These are devices presenting a continuous and essentially constant value of load, over extended periods e.g. Signal lights, all transformer/rectifier sets, Computer Based Interlockings, etc. Occasional Loads These devices are not normally on, but may be switched on at times for extended periods, generally not exceeding an hour e.g. Location lighting and instrument outlets. Transient Loads These devices are also not normally on, but when switched on, present significant loads for brief periods, generally of several seconds e.g. Trainstops, points machines, level crossings, etc. All transformers are subject to losses of two kinds iron losses (magnetisation current) and copper losses (I 2 R losses in the windings). For each transformer in a mains feeder, an allowance shall be added equal to 15% of the calculated downstream load. Cable lengths between locations shall be as determined on the site, and shall include suitable allowances for route deviation and cable termination. They shall be not less than the exact measured length along the actual cable route, plus 10 metres. Cable sizes shall be selected such that the final total voltage drop from the feed location to the extremity of each feeder does not exceed the specified limits SER Power Supply SERs shall be supplied from the ESDS at 400V/230V. A switchboard shall be provided which in turn feeds lighting and power and loads as described in 10.2 via a 400V/110V or 230V/110V transformer, as well as the UPS to back up the CBI supplies CER Power Supply The CER electrical distribution shall meet the requirements of MTM Communications Equipment Room Standard (Draft) Vic Track Power Supply Vic Track requires a minimum of eight (8) single phase 230V earthed neutral circuits, which can support a minimum load of 4kVA. The CER switchboard and cabling shall comply with AS/NZS Railway Station Power The ESDS shall supply at railway substations shall only supply designated ESDS loads and may only be varied by the Head of Engineering - Electrical. The power company supply shall supply all other loads including safety services including but not limited to: PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 23 of 33

24 Car parks owned and operated by MTM shall be supplied via metered sub-mains from the Installation Main Switchboard, fed from the Local Electricity Distributor supply. General Lighting and Power Rail Siding Lighting Particular consideration shall be taken for the installation of Field LAN Switch (FLS) enclosures throughout the site and remote from the CER that are housed in metal enclosures with the DC supply (-48v, positive earth) and earth from the CER connected to the metal enclosure. Cables shall be selected in accordance with AS/NZS , based on: current carrying capacity, taking into account derating factors for method of installation, grouping of circuits and external influences earth fault loop impedance voltage drop cable short circuit rating The ESDS supply and power company supply shall follow different routes and shall not be installed in the same conduit or ducting. Cable routes shall have 30% spare capacity to allow for future electrical wiring. Conduits and wiring shall generally be concealed and fixed by suitable supports and cable trays. No exposed conduits shall be used unless agreed to by MTM. To this end conduits shall be chased in masonry walls and appropriately sealed in a manner consistent with the finished surface. If surface mounted, these shall be neatly fixed to ensure station or building appearance is not compromised Steel conduit is not permitted due to stray dc currents and corrosion issues, For major non-underground cable runs consisting of multiple cables/conduits, including suspended cables, the use of cable trays or ladders is required. Any reference to cable trays shall equally apply to cable ladders. Cable trays shall be perforated steel and hot dipped galvanised, have purpose made tees, bends etc., and be from the same manufacturer. These shall be sized to cater for the required cable runs, with an allowance of 30% spare space for future cabling. Where cable trays carry other than electrical conduits, the required separation distances or physical isolation shall be provided. Cable trays shall be run in such a manner as to follow the structural members of building. Tee-offs shall be implemented in a manner that has minimum visual impact on the building or facility in which they are installed. The height and disposition of cable tray runs shall give due consideration to safe and easy accessibility by ladder, preferably located so access can occur outside a Train Track Possession. Cables shall be neatly installed on cable trays, utilising proprietary straps and fixings. Cable spacing shall be in accordance with AS 3008 and de-rating shall be avoided. A 30% spare capacity shall be provided. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 24 of 33

25 The Isolating transformer used at the power distribution supply shall be a transformer with protective separation between the input and output windings which conforms to AS/NZS Generally, this is a three phase Dyn1 400V/400V transformer or single phase 230V/230V transformer that isolates the Local Electricity Distributor s Service Equipment (MEN earth) from any part of the ESDS distribution system. All design and installation of ESDS and distribution company power supply, equipment and systems shall be in accordance with AS/NZ The Myki system will require connection to the ESDS and shall be fed from its own circuit breaker from the ESDS 400V busbar. 11 Equipment and Installation 11.1 General Specifications Equipment for the ESDS power distribution system shall follow the following specifications: Document Number L1-CHE-SPE-024 L1-CHE-SPE-154 L1-CHE-SPE-014 L1-CHE-SPE-150 L1-CHE-SPE-039 Title Technical Specification for Uninterruptable Power Supplies For The Metropolitan Railway Essential Services Distribution System Specification Technical Specification for Auxiliary Transformer for Use in a Railway Substation Technical Specification for 3.3kV Automatic Control and Indicated Fixed Mounted Trackside Switchgear for Signal Purposes Signal Power Transformer 3.3kV/1kV/110V L1-CHE-SPE-070 High Voltage Cable Routes ESDS equipment shall be selected and installed to satisfy the requirements for selection, compliance, personal safety and labels of sections to inclusive, of AS Trackside 3.3kV Signal Equipment Location A single phase dual conversion UPS shall be provided at each 3.3kV Signal Equipment location to ensure power is available to the location for operation of SCADA and the switchgear. The UPS shall be the same capacity as the step down transformer and shall be able to sustain the capacity for a 24hour outage of the main 3.3kV supply. A supply from a local power company shall not be used as a backup supply. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 25 of 33

26 12 Inspection and Testing Inspections and tests shall be carried out on the ESDS to verify compliance with this specification, design and installation with the applicable standards and compliance of the equipment with the applicable technical specifications. A full inspection and test plan shall be used in accordance with AS 2067 and AS/NZ Documentation 13.1 General All documentation shall be provided in English. One electronic and eight paper copies of the each document shall be provided and the content shall be identical in each copy. Every page of the documentation shall be clearly identified in relation to the document to which it belongs and the version of that document. All pages of multi-page documents shall be uniquely numbered. It shall be possible to readily determine if all pages of a document are present. Manuals shall be A4 size and shall be bound in durable covers or in 4-D ring binders Design Process The design process shall consist of system design review (SDR), preliminary design review; (PDR) and critical design review (CDR) design phases in accordance with L1- CHE-MAN-001. The deliverables for each of the phases is provided in Appendix B Operation and Maintenance Manual The ESDS shall have an operation and maintenance manual as per Section 10 of AS Design Documentation All drawings must comply with PTV Infrastructure Drafting Standard and shall be submitted for MTM approval prior to manufacturing. Files shall be provided in Microstation and PDF format on compact disk (CD) Technical Maintenance Plan A Technical Maintenance Plan which establishes the maintenance policy for various devices recommended by the suppliers shall be provided. This shall detail the preventative servicing schedules, maintenance instructions and intervals for all components of the ESDS. The servicing schedules shall reference appropriate detailed maintenance instructions in the manufacturer s manual. The Technical Maintenance Plan shall contain a list of any recommended spare parts, detailing price, supplier and procurement lead-times. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 26 of 33