L1-CHE-STD-061 INTERNAL 22kV DISTRIBUTION

Transcription

1 Engineering Standard Electrical Networks Version: 1

2 Approval Amendment Record Approval Date Version Description 01/07/ Initial Release PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 2 of 16

3 PREFACE This Standard will be managed under the Engineering Standards Development Procedure (L1-CHE-PRO-032). As documents are uncontrolled once printed, it is imperative to check the currency of the Document on The Depot or the MTM s Document Portal which is available externally at All MTM Standards and Specifications are periodically reviewed, and new editions are published which incorporate learnings and Technical Notes (formerly known as Design Practice Notes). Technical Notes are issued between editions which correct any errors or ambiguities contained in an MTM Standard/Specification. Standards and Specifications may also be withdrawn and/or replaced. In the event of conflicts or discrepancies between different types of technical documents, refer to the order of precedence as defined in Chief Engineer s Guideline Engineering Standards Listing (L1- CHE-GDL-005). Note: Any clarification described in a Technical Note or Design Practice Note shall take precedence over the impacted clause or clauses in the associated MTM Standard/Specification. In the event a clause within a Standard/Specification is not achievable a waiver will need to be raised, please refer to the Engineering Waiver Procedure - L1-CHE-PRO-001. Note: MTM does not have the authority to grant waivers on any Standards/Specifications or clauses within a Standard/Specification which relate to Government Regulations or Legislation, e.g. Electricity Safety Act, Electrical Safety Regulations (Energy Save Victoria), Disability Discrimination Act. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 3 of 16

4 Table of Contents 1 Preface Purpose Scope Abbreviations Glossary of Terms Definitions References and Legislations Related Documents MTM References Industry References and Legislation Australian References Safety and Environmental kV Distribution General Principles Bare 22kV HV Conductors kV HV Cables Design Documentation and Certification General Electrical Diagrams Layout Plans Profile Drawings Cross Section Drawings Other design information PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 4 of 16

5 1 Preface 1.1 For the purpose of this document, the terms Distribution and Transmission are to be used interchangeably. Transmission is defined as a voltage greater than 66kV, so a 22kV system is a distribution system by modern definition. However, the term 22kV Transmission has been used in the railway context historically for many years and is understood. 2 Purpose 2.1 To define the standards required for the design and construction of 22kV AC distribution lines, cables and related equipment for the Melbourne Metropolitan Railway. 3 Scope 3.1 This Standard applies to the design and construction of all new electrification projects for the Melbourne Metropolitan Railway Network. 3.2 This Standard also applies to the upgrading of the existing traction wiring, distribution lines, cables and related equipment. 3.3 The Standard applies to works on the Infrastructure Lease and to works undertaken on other land which are intended to expand or enhance the provision of passenger services and to form part of the Infrastructure Lease. 3.4 MTM Head of Engineering Electrical shall be consulted in cases where there are perceived to be uncertainties, conflicts or ambiguities as to the requirements or the intent of this standard. 4 Abbreviations ABC AC AS CSR DC EPR ESV HDPE HV kv MTM OHW ONRSR PTV Aerial bundled cable Alternating current Australian Standard Common services route Direct current Earth potential rise Energy Safe Victoria High-density polyethylene High voltage Kilovolt (equal to 1000 volts) Metro Trains Melbourne Pty Ltd Overhead wiring Office of the National Rail Safety Regulator Public Transport Victoria PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 5 of 16

6 SFAIRP XLPE So far as is reasonably practicable Cross-linked polyethylene 5 Glossary of Terms Ambient temperature Bond Distribution wire height Earth/ground Factor of safety Ground clearance Protective device Radial load Self-supporting anchor Slack span Span length Static clearance Strain span Suspension Wind load (operational) The weather related temperature of the conductors, which excludes temperature effects due to current in the conductors. An electrical connection between metal hardware (rails, structure etc.) that eliminates voltage difference. Distance between HV conductors/components and the top of surrounding surfaces or areas which are accessible to people/plant or which a person could stand. The reference point from which different potentials are measured and which acts as a common current return path in a fault condition. It is typically a physical electrical connection to the general mass of planet Earth. Margin of safety in terms, usually of strength, between the breaking load and the maximum design operating load expressed as a ratio. The distance between live components/conductors and the nearest standing surface. An open circuit device which short circuits under fault conditions such as spark gap, diode or automatic overvoltage relay device. It services to control the effects of stray currents (and the resultant electrolytic corrosion) and/or to provide electrical safety. Also referred to as a Voltage Limiting Device Horizontal load comprising of static forces caused by a change in the direction of a conductor at a support or registration point. Anchor mast without a back-guy. A span of aerial conductor where the tension is as low as possible (such as to limit sag to ensure electrical clearances are met). They are typically used as a transition between equipment (such as transformers, switchgear or isolators) and aerial distribution lines The length of transmission conductor between one support/suspension and the next. The distance between two items without the influence of external forces such temperature or wind. A span of aerial conductor where each end is independently tensioned and terminated to self-supporting structures at each end of the span such that it is not reliant on adjacent spans. Refer D7629 and STD_E0142 Support of a conductor in the vertical plane The maximum load imposed on a support or registration point due to a conductor under the highest operational wind speed condition PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 6 of 16

7 6 Definitions Area accessible to public High voltage Infrastructure lease Low voltage Nominal voltage Restricted area Shall (normative) Should (informative) Area to which the public has unrestricted access. This includes: Station entrances Platforms Level crossings (both road and pedestrian crossings) Within 10m of a level crossing or pedestrian crossing Areas delineated by an approved fence Exceeding 1000V AC or 1500V DC Is defined as the meaning in the Franchise Agreement. As defined by Australian/NZ Standards (<1000V AC or <1500V DC) Voltage by which an installation or part of an installation is designated Area for which access is only permitted for authorised persons 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. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 7 of 16

8 7 References and Legislations 7.1 The hierarchy of, and conformance to any requirements, legislations, standards or specifications shall be as per the Chief Engineer s Guideline Engineering Standards Listing L1-CHE-GDL The design and construction of electrical installation works for the railway shall comply with the Electrical Safety (Installations) Regulations Related Documents 8.1 MTM References Document Number N/A L0-SQE-PLA-005 L1-CHE-GDL-005 L1-CHE-MAN-005 L1-CHE-PRO-001 L1-CHE-PRO-004 L1-CHE-PRO-031 L1-CHE-PRO-037 Title MTM Document Portal: Environmental Management Plan Chief Engineer s Guideline Engineering Standards Listing Electrical Networks Engineering Manual Standard Waiver Procedure Type Approval Procedure Engineering Change Procedure MTM Tree Management Procedure L1-CHE-SPE-017 Transmission Wire Hard-Drawn Copper 19/ mm 2 L1-CHE-SPE-070 L1-CHE-SPE-234 L1-CHE-STD-006 L1-CHE-STD-011 L1-CHE-STD-013 L1-CHE-STD-058 L1-NAM-PRO-002 High Voltage Cable Routes Technical Specification for 22kV Distribution Wire Hard-Drawn Copper 19/ mm 2 MTM Requirements Spares for New Assets 1500VDC Overhead Wiring System MTM Structures and Facilities Standard Metropolitan Railway Stations Overhead Wiring and Signalling Structures Standard MTM Design and Technical Review Procedure PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 8 of 16

9 L2-ELN-SPE-025 L2-ELN-SPE-026 L2-INF-PLA-004 MEMF MEST MEST MEST MEST Technical Specification for Electric cable - 22kV, 3 core, 185mm 2 aluminium Technical specification for electric cable - 22kV, single core, 95mm 2 copper MTM Tree Management Procedure Overhead Line Electrification Functional Requirements Form MTM Standard - Traction Substations and Tie Stations Track Bonding for Signalling and Traction Return Current Electrical Networks Principles Performance Earthing Requirements for HV Transmission Structures 8.2 Industry References and Legislation Document Number N/A N/A Title Victorian Traction Industry Electrical Safety Rules revised May 2017 (The Orange Book) Standard Conditions for Electric Power Overhead Lines on or over land vested in VicTrack N/A Electrical Safety Act 1998 N/A Code of Practice for Electrolysis Mitigation 2015 N/A Electricity Safety (Electric Line Clearance) Regulations 2015 N/A Electricity Safety (Bushfire Mitigation) Regulations 2013 S.R No. 151/2009 Electricity Safety (Cathodic Protection) Regulations 2009 S.R No. 164/2009 Electricity Safety (Installations) Regulations 2009 PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 9 of 16

10 8.3 Australian References Document Number AS :2011 AS 1214:2016 AS 4100:1998 AS 4436:1996 AS 4680:2006 AS/NZS 1768:2007 AS/NZS 3000:2018 Title Structural design actions Wind actions Hot-dip galvanized coatings on threaded fasteners (ISO metric course thread series) Steel structures Guide for the selection of insulators in respect of polluted conditions Hot dip galvanised (zinc) coatings on fabricated ferrous articles Lightning Protection Electrical installations - Wiring Rules 9 Safety and Environmental 9.1 Safety and risk assessments shall be undertaken for Overhead line electrification projects, addressing all areas of specification, design, construction, operation and maintenance of the traction wiring, distribution lines, cables and related equipment. 9.2 The approach to the operation and maintenance of the traction wiring, distribution lines, cables and related equipment shall be based on the principle of providing safe and functional electric traction and other supplies so far as is reasonably practicable (SFAIRP). 9.3 The design, construction and operation of the traction wiring, distribution lines, cables and related equipment shall comply with the current revision of MTM Environmental Management Plan. Refer to L0-SQE-PLA-005. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 10 of 16

11 10 22kV Distribution 10.1 General Principles Insulation flash-over due to insulator failure or lightning strike may damage track based signalling equipment. Therefore, masts and portal structures supporting traction wiring shall not be used to also support bare HV AC conductors New HV AC distribution conductors shall be run as underground cables in a common service route (CSR) to High Voltage Cable Routes Specification L1-CHE- SPE Legacy HV distribution routes where the 22kV supply is mounted on shared Overhead wiring support structures are to be relocated as rebuilding allows and replaced with insulated cables in CSRs Where constraints exist, 22kV distribution conductors may be run as bare Overhead conductors on free standing poles/masts only with the express approval of the MTM Head of Engineering - Electrical, or delegate kV distribution conductors may be provided from the point of supply from the distribution/transmission provider or between traction substations For 22kV distribution clearances to the Overhead infrastructure, refer to drawing H6999 or as per the applicable ESV regulation, whichever is the more onerous ESV regulations shall apply to clearances for 22kV conductors to ground, earthed items, buildings, bridges, pedestrian overpasses and other public areas kV distribution conductors shall not pass over platforms kV distribution conductors shall not pass over tramways OHW conductors Masts and structures carrying HV conductors shall be earthed in accordance with MEST Earthing Requirements for HV Transmission Structures HV AC distribution line aerial conductors shall be fully rated for the load and fault currents applicable to the installation HV AC distribution lines shall not be installed on masts which also support 1500V conductors or signalling equipment Clearance requirements for ABC shall be as per bare aerial conductors. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 11 of 16

12 10.2 Bare 22kV HV Conductors General HV AC distribution line aerial conductors shall be sized and fully rated for the load and fault currents applicable to the installation HV AC distribution bare aerial conductors shall be minimum 70mm 2 to MESP and drawing D3218/ Aerials conductors shall be uniform in cross section throughout the entire 22kV distribution line length kV distribution conductors shall be supported on insulators to drawings D4160 or D kV distribution conductors shall be terminated using insulators to drawing D Where the distribution crosses the 1500VDC conductors, both ends shall be strain supported Aerial distribution conductors shall pass over the top of and perpendicular to the 1500VDC conductors Distribution conductors crossing public roads, waterways, footpaths or pedestrian crossings shall be strain supported and shall include no joins or splices in the crossing span Generally a tension length of distribution conductor is 1000m. Design should consider the placement of strain supports accordingly Current carrying connections shall not be placed in tensioned 22kV conductors Sag All HV conductors shall, at the maximum conductor temperature and any ambient conditions, not sag to below the applicable electrical clearances to ground, other conductors or nearby structures. Refer D3218, H6999 and ESV regulations Splices Splices in HV conductors are to be avoided. Where splices are required, the following shall apply: Splices shall not be installed with 5m of a support point Splice locations are to be recorded and provided to MTM PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 12 of 16

13 kV HV Cables kV HV cables shall be to L2-ELN-SPE-025 (22kV, 3 core, 185mm 2 aluminium) In confined areas where a smaller cable bending radius is required, L2-ELN-SPE-026 (22kV, single core, 95mm 2 copper) may be used HV AC cables shall be XLPE screened cables sized for the voltage, load and fault currents applicable to the location Cables originating in a substation or switching station shall have the screens of the cables bonded to the substation or switching station earth system. The screens at the other cable ends shall be insulated and sleeved with the insulation level applicable to the voltage rating of the cable Cables between distribution line sections shall have the screens of the cables earthed at one end by connection to an earth grid. The screens at the other cable ends shall be insulated and sleeved with the insulation level applicable to the voltage rating of the cable Cables shall be fitted with surge diverters applicable to the system voltage to drawings L8573 and STD_E0178. The surge diverters shall be installed where the cable joins the distribution line and be connected between each phase and earth The need for an isolating switch at both ends of a 22kV cable shall be assessed and advised by the MTM Head of Engineering - Electrical, or delegate, after taking into account operational requirements and consequences of the failure of the cable. 11 Design Documentation and Certification 11.1 General The designer shall be responsible for the provision of all documents, data and drawings, necessary for the satisfactory completion and performance of the works The design shall include interfaces to the existing system and any necessary interface stage work The designer shall provide the design in accordance with the scope of work All drawings shall be produced and stored as DMS compliant drawings in accordance with applicable PTV Infrastructure Drafting Standards Standard System Drawings are created and updated by MTM only. Any required updates should be provided to MTM as a marked up copy and preferably along with any supporting information and DGN files. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 13 of 16

14 11.2 Electrical Diagrams All affected operating diagrams (such as 22kV Distribution diagrams, single line diagrams, switching diagrams, system diagrams etc) are to be provided as mark ups for discussion with and approval by the MTM Head of Engineering - Electrical, or delegate Electrical diagrams are MTM Engineering Controlled Diagrams and are updated, approved and published by MTM only Layout Plans kV Distribution plans shall be included on the applicable 1500V DC OHW layout plans (refer MEST ) and shall include at a minimum the following: Track Overhead wiring Signal positions Bridges Platforms Other relevant geographic features VicTrack lease boundary Each layout should represent no more than one tension length of Overhead equipment Layouts shall be 1:500 geographic plans and based on recent (less than 6 months old) feature survey For review stage layout plans, long-plots shall be provided For as-built stage layout plans, DMS compliant drawing shall be provided. Pending prior agreement from both MTM and PTV/DMS, long-plots may be provided, alternatively A3 size drawings shall be provided Aerial photography may be provided as a clouded background (raster) on design layout drawings to aid in the design and review process, however they shall be removed or hidden for As-built layout drawings Profile Drawings Profile drawings shall: be scaled at Horizontal 1:500 and Vertical 1: include dimensioning of electrical and mechanical clearances be provided for all spans which pass under or over a structure such as an over-line bridge, walkway, level crossings, buildings, other conductors be provided for other areas or spans at the request of MTM Profile drawings for fixed tension conductors shall depict the conductor at 0 C, 20 C and the maximum conductor temperature. PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 14 of 16

15 11.5 Cross Section Drawings Cross-sections shall: be provided in A3 size at 1:100 scale include a correctly scaled and true depiction of the 22kV arrangement be drawn as facing in the down direction Complex arrangements shall include side, top or 3D views on the cross-section drawing as appropriate Cross-section drawings shall include the following information as a minimum: 11.6 Other design information A table of wire heights at 20 C and loads at the 28m/s wind criteria Conductor tension at 0 C A material list of assemblies, components and quantities Mast/pole and foundation types and sizes Notes applicable to the design as necessary Any relevant geographic features (embankments, fences, retaining walls, station structures and the like) Face of mast to track centreline dimensions Each design shall include an overarching design report - containing at minimum the following: Project scope, description and location Any other associated projects/designs Description of existing conditions Assumptions Designer, checker and independent reviewer competencies Safety considerations Description of the proposed design Departures from project requirements Non-conformances to standards Non-standard designs/arrangements Analysis methods and calculations Impacts to other rail disciplines Impacts to other rail, public and 3rd party infrastructure Earthing and Bonding Report Non-standard arrangements PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 15 of 16

16 Switching and feeding arrangements Lightning mitigation report (as deemed required by the MTM Head of Engineering - Electrical, or delegate) Construction staging plans Design calculations Insulation Coordination Study (if applicable) Survey data Material list as required PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 16 of 16