Manual: Distribution Substation Manual (DSM) Section I: Introduction Standard Number: HPC-5DA-07-0010-2012
Document Control Author Name: Viswa Easwaran Position: Standards Engineer Document Owner Name: Justin Murphy (May also be the Process Owner) Position: Manager Asset & Works Approved By * Name: Justin Murphy Position: Manager Asset & Works Date Created/Last Updated January 2014 Review Frequency ** 5 yearly Next Review Date ** January 2019 * Shall be the Process Owner and is the person assigned authority and responsibility for managing the whole process, end-to-end, which may extend across more than one division and/or functions, in order to deliver agreed business results. ** Frequency period is dependent upon circumstances maximum is 10 years from last issue, review, or revision whichever is the latest. If left blank, the default shall be 1 year unless otherwise specified. Revision Control Revision Date Description 0 14/01/2014 Original Issue Manager Assets & Works Manager Engineering Services STAKEHOLDERS The following positions shall be consulted if an update or review is required: Manager Engineering Systems Planning DM# 3770748 Page 2 of 10 Print Date 3/07/2017
TABLE OF CONTENTS 1 PREFACE... 4 2 INTRODUCTION... 5 2.1 Format and Content of the Manual... 5 2.1.1 Section 1: Customer Supply Arrangements... 5 2.1.2 Section 2: MV Network Arrangements... 5 2.1.3 Section 3: Substation Arrangements... 6 2.1.4 Section 4: Kiosks Equipment Installation Guide... 6 2.1.5 Section 5: Substation Fire Protection Requirements... 7 2.1.6 Section 6: Miscellaneous... 7 2.1.7 Section 7: Superseded Equipment - Installation Guide... 7 2.1.8 Section 8: Distribution Automation... 8 2.1.9 Section 9: Environmental Protection for Substation... 8 2.1.10 Section D - Drawing Revision List... 8 2.2 Use of the Manual... 8 3 REFERENCE DOCUMENT... 10 4 REVISION INFORMATION... 10 DM# 3770748 Page 3 of 10 Print Date 3/07/2017
1 PREFACE This Distribution Substation Manual (DSM) contains the approved standard arrangements for the design, construction and installation of distribution substations; connection of customers to these substations and interconnection of the substations to the surrounding MV and LV networks within Horizon Power s North-West Interconnected System (NWIS) and the Regional Non-Interconnected System (RNIS). It supersedes the Western Power Distribution Substation Manual previously applicable to Horizon Power networks. Although the design principles and arrangements contained in this Manual are intended to be generally applicable to all installations with Horizon Power s supply networks, there may be areas within the distribution network that require special consideration. This Manual does not contain any equipment fabrication drawings. These are now contained in a separate manual. This Manual is to be used in conjunction with the following documents: Horizon Power Technical Rules Distribution Design Manuals - Volumes 1 to 5 Field Instruction Practices and Standards Manual (FIPSM) WA Electrical Requirements Western Australian Distribution Connections Manual (WADCM) Underground Distribution Schemes Manual General Conditions for Individual Customers - DMS# 3133065. [Formerly identified as General Conditions for Individual Customers - DSB 95/5] Substation Installation Requirements - DM# 3666797 [Formerly identified as Substation Installation Requirements - DSB 95/6] DM# 3770748 Page 4 of 10 Print Date 3/07/2017
2 INTRODUCTION This manual is intended to provide guidelines on the format, contents and use of the Distribution Substation Manual. In conjunction with the Substation Installation Requirements and WADCM (Western Australian Distribution Connections Manual), it describes the customer s responsibilities in relation to the design and installation of the substation. 2.1 Format and Content of the Manual This Manual is divided into nine Sections as listed below. Each Section contains its own drawing index, with revisions listed in Section D Drawing Revision List. In addition, some sections contain design notes. Section Description 1 Customer Supply Arrangements 2 MV Network Arrangements 3 Substation Arrangements 4 Kiosks Equipment Installation Guide 5 Substation Fire Protection Requirements 6 Miscellaneous 7 Superseded Equipment - Installation Guide 8 Distribution Automation 9 Environmental Protection for Substation D Drawing Revision List Table 1: Sections of the DSM 2.1.1 Section 1: Customer Supply Arrangements Section 1 shows the standard arrangements for the connection of LV or MV customers to new or existing distribution substations. These drawings enable the designer to select the correct method for connection of a customer along with the appropriate fuse arrangements. 2.1.2 Section 2: MV Network Arrangements Section 2 shows the standard arrangements for the interconnection of a new distribution substation into the existing MV network. These drawings enable the designer to select the required substation arrangement and also the correct method of interconnecting the substation with the MV network. DM# 3770748 Page 5 of 10 Print Date 3/07/2017
The standard also describes the philosophy associated with the design of MV network at the different voltage levels. Also there are guidelines that must be taken into consideration during the design of the network. 2.1.3 Section 3: Substation Arrangements Section 3 shows the standard arrangements in relation to land and clearances for distribution substations. The drawings are intended to be issued for the customer s reference. Each substation arrangement drawing has three sheets as described below: 1. Civil and Land Requirements shows the land area required for the substation and any civil construction requirements (but no civil design details). For substations which are required to be fire rated, this sheet will also show the requirements for the fire rated enclosure. 2. Equipment and Installation Details shows the equipment required within the substation and its physical arrangement on the site. All equipment shown is based on assemblies contained in the Distribution Design Catalogue (DDC). NOTE: 3. Operational Clearances Earthing layout shown on this drawing is indicative only. Detailed earthing drawings can be found in DSM 6. shows the operational clearances required for equipment within the substation. These drawings provide the designer with the basis of the substation site area requirements to allow flexibility if alternative site areas/shapes are required in specific cases to satisfy a customer s need. Where a customer requires a non-standard substation arrangement, (for example where an odd shape site exists), the above drawings shall be made available to the customer. It is the customer s responsibility, in conjunction with his architect, to prepare an alternative arrangement design. This design must meet all of HP s operational requirements and any relevant Australian Standards requirements. The design shall be submitted to HP for approval. 2.1.4 Section 4: Kiosks Equipment Installation Guide Section 4 shows the general outlay and installation guide for the kiosk enclosed distribution substation equipment used by HP. This includes MV ring main switchgear kiosks (RMU s), modular package substations (MPS s), non Modular package substations (non-mps s) and LV switchgear kiosks. Each kiosk arrangement drawing has the following details: 1. General Arrangement shows the physical arrangement and dimension references for the equipment. 2. Installation Guide shows the requirements for installation of the equipment, for example, lifting points, soil compaction and installation sequences. This sheet is for issue to stakeholders and external parties responsible for preparation of site and installation of the equipment. DM# 3770748 Page 6 of 10 Print Date 3/07/2017
In addition the standard also provides guidelines on the various switchboard arrangements permissible for LV kiosks and the cable arrangements applicable for termination into a non-mps transformer. 2.1.5 Section 5: Substation Fire Protection Requirements Section 5 shows the fire protection requirements for distribution substations. These drawings are intended to provide designers with guidelines on determining the fire risk zones around a substation and what protection measures are necessary in the risk zones. These drawings can also be issued to customers for the same purpose. 2.1.6 Section 6: Miscellaneous Section 6 contains drawings relevant to distribution substations, which are of an ancillary nature and which are referenced on one or more of the above drawings. They include: 1. Substation Ducting Cross Sections shows the required cross sections of ducts into distribution substations. 2. Substation Exhaust Fan and Distribution Board Details shows the details and distribution board for the fan supply when required in a fully enclosed substation with no cross flow ventilation. 3. Indoor Substation Support shows the details of the trench and dimensions of support beams/stanchions required to install a district/sole use substation and MV switchgear inside a MV switchroom. 4. Extensible Switchgear Support shows the details of the support stanchion/beam for extensible type switchgear in a MV switchroom. 5. Transformer Lifting Details shows the detail for lifting transformers using lifting eyes or a monorail. 6. Earthing Requirements shows the earthing installation requirements for the distribution substation arrangements described by DSM 3 (indoor and outdoor). 7. Permissible Screening Arrangements shows what screening requirements are permissible around substations (only provided for substations which are not required to be fire rated). It details the customer s options and responsibilities in relation to the erection of screening around the substation site. 2.1.7 Section 7: Superseded Equipment - Installation Guide Section 7 shows the installation requirements for superseded equipment, specifically, the old style of transformers and associated medium voltage switchgear installed in non fire rated compounds, IPS transformers and IPS transformers with MV switchgear. DM# 3770748 Page 7 of 10 Print Date 3/07/2017
These drawings align the installation of this superseded equipment with the current version of the DSM to avoid the potential problems when excavation occurs around the transformer during the installation of cables. In addition the drawings also show the superseded construction used in indoor support beam for substations. 2.1.8 Section 8: Distribution Automation Section 8 shows drawings relevant to the automation and typical configuration of Remote Terminal Units (RTU s) for switchgear units. [Note that most Drawings (DSM- 08-1 to DSM-08-06) are superseded, except for those relating to Schneider RM6 units (DSM-8-07). 2.1.9 Section 9: Environmental Protection for Substation Section 9 shows requirements for substation installations in environmentally sensitive sites (Specifically areas that require oil containment and areas above the normal flood level ratings). This standard covers: 1. Standard arrangement in relation to land and clearances for distribution substations that require oil containment. 2. Land and construction requirements for areas with above normal flood levels. 2.1.10 Section D - Drawing Revision List Section D shows the list of the latest updates that have been made on all the drawings in the manual. 2.2 Use of the Manual The DSM documents described in Section 2.1 are discrete and can be referred to individually as per design requirements. The steps below illustrate the use of DSM s for a new distribution substation that is to be installed to meet the load requirement of customer. 1. Determine the customer s maximum load demand. This is discussed in detail in the Distribution Design Manual Volume 3 - Supply to Large Customer Installations. 2. Determine the type of substation required, i.e. District, Sole Use or Customer Owned. This is discussed in detail in the Distribution Design Manual Volume 3 - Supply to Large Customer Installations. It is also discussed briefly in the Substation Installation Requirements. 3. Check if any additional capacity is required to be fed back into the street. 4. Determine the minimum number and sizes of transformers required to be installed in the substation. In the case of a new discrete load, before this can be determined it may be necessary to discuss the level of security required by the customer (e.g. the customer may require 2 x 630 kva transformers rather than 1 x 1000 kva transformer). 5. Select the most appropriate Customer Supply Arrangement drawing (contained in Section 1 of this Manual) based on the above information. Note that the transformer size in conjunction with the customer s maximum load demand will DM# 3770748 Page 8 of 10 Print Date 3/07/2017
determine the size of fuse, link or disconnect required for the customer and also whether or not the customer s switchboard must be contiguous. Also refer to the Substation Installation requirements. 6. Determine whether a modular package substation (MPS) arrangement or non MPS arrangement is required. Section 4 describes the various arrangements available for the installation of the equipment. 7. Select the most appropriate MV Network Arrangement drawing (contained in Section 2 of this Manual) based on the neighbouring MV network to which the substation will be connected. Note that MV transformer fuse sizes are provided in drawing DSM -1-02. 8. Determine the fire protection requirements for the substation based on the proposed location of the substation in relation other land uses in the vicinity (e.g. other structures or buildings) and the drawings contained in Section 5 of this Manual. See Substation Installation Requirements. 9. Select the correct Substation Arrangement drawing (contained in Section 3 of this Manual) from the table on the MV Network Arrangement drawing based on the substation type and fire protection requirements. If the substation is to be situated in an environmentally sensitive site then refer to arrangements in Section 9. 10. Based on the Substation Arrangement drawing and other information determined in previous steps (e.g. transformer size, type and size of customer fuse/link/disconnect, and need for a contiguous switchboard), finalise the design and prepare an assembly list for the substation. In the case of a non fire rated substation, the customer s requirements for screening of the substation should also be determined at this point. See Section 6-13 for more detailed discussion on substation screening. DM# 3770748 Page 9 of 10 Print Date 3/07/2017
3 REFERENCE DOCUMENT The following Reference Documents have been used to prepare this Standard: Doc Ref. Document Title Record No DM# Distribution Substation Manual - Section 1 Customer Substation Arrangements Substation Installation Requirements Western Australian Distribution Connections Manual 3119455 (Superseded) Publisher Horizon Power 3666797 Horizon Power 3468505 Horizon Power and Western Power 4 REVISION INFORMATION (Informative) Horizon Power has endeavoured to provide standards of the highest quality and would appreciate notification if any errors are found or even queries raised. Each Standard makes use of its own comment sheet which is maintained throughout the life of the standard, which lists all comments made by stakeholders regarding the standard. A comment sheet found in DM: 3749536 can be used to record any errors or queries found in or pertaining to this standard, which can then be addressed whenever the standard gets reviewed. Date Rev No. Notes 0 14/01/2014 Original Issue DM# 3770748 Page 10 of 10 Print Date 3/07/2017