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Changes to the Distribution Substation Manual (DSM)

Section 3 – Substation arrangements of the Distribution Substation Manual (DSM) has been updated and is now available on the Western Power website.

The update to this section of the manual also marks the start of transition of the DSM into two separate manuals. This published version will be the interim DSM for the next few months, after which the manual will be split into two, the Distribution Substation Plant Manual (DSPM) and the Distribution Customer Connection Requirements (DCCR) manual.

Splitting the content of the DSM will enhance the information packages contained in each manual. The DSPM will provide a clearer, more complete picture of distribution substation plant and the standard layouts within the substation site. The DCCR will collate a range of information regarding customer supply and connection arrangements.

The updates to the interim DSM section 3 relate to standard plant arrangements for distribution substations and the transformers supplied to Western Power by Tyree and ETEL. It also contains a new Introduction, Disclaimer and an explanation of the Information that is provided on the drawings. Please refer to the DSM for further details.

To ensure consistent messaging within Western Power manuals (DSM, UDS and WADCM), the DSM drawings also refer to the Distribution Design Catalogue (DDC) for earthing arrangements. The Earthing FAQ document provides additional advice on Western Power’s earthing standards.

In addition to the new transformers one of the changes to the interim DSM relates to substation arrangements DSM– 3-22A and DSM-3-22B.

  • DSM– 3-22A, the direct bus coupled layout has been removed. It had become apparent that if an incident occurred on either parties’ switchboard it could result in damage to both switchboards, having the potential to increase costs for repair or replacement.
  • DSM-3-22B, the cable connected arrangement, has been Western Power’s preferred option since 2012 and is now the standard HV connection arrangement. This is now named DSM-3-22. One of the benefits of this arrangement is that customers can select their own switchgear and are not limited to using the same equipment as Western Power. Additionally, any changes to Western Power’s equipment in the future will not require the customer to change their equipment.

Please contact Western Power’s customer relations representative if the removal DSM-3-22A presents any problems for your projects that have been designed using the direct bus coupled layout.

If any of the changes in this bulletin require updates to tools that are used for your external design purposes, please contact your customer relations consultant.

Please note the additional minor changes in the DSM summarised below:


DSM Section

Generator connection and operating modes clarified

3-01, 3-02

Sheet 5 (earthing) removed

3-01, 3-02

DDC referenced for earthing

3-01 – 3-10, 3-13 – 3-21, 3-23, 3-25 – 3-27

Clearance requirements detailed

3-01 – 3-10, 3-13 – 3-23, 3-25 – 3-27

Screening requirements detailed

3-01 – 3-06, 3-13 – 3-16, 3-25 – 3-27

Access & egress routes amended

3-01 – 3-10, 3-13 – 3-23, 3-25 – 3-27

160kVA option removed, 33kV option removed

3-03 – 3-06

ETEL Transformer added

3-03 – 3-06

LV switchgear notes added

3-07 – 3-10

Concrete hardstand detailed

3-07 – 3-10, 3-22

HV Switchgear installation requirements added

3-08, 3-10, 3-22

HV Switchgear support fabrication details added


Box culvert added


Split bus HV Switchgear arrangement added


Sheet 5 fire clearances removed


Ownership of pole top switch clarified


ABB removed and Tyree Transformer added

3-25 – 3-26

SPURS switchgear removed


Tyree Isolation Transformer added


During this interim DSM period there may be minor cases of misalignment between the sections. Please don’t hesitate to contact the Substation Plant mailbox for clarification or advice where any of these changes impact your project. [email protected]

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