The Beryl and Mount Piper Substations contain 132/66kV networks to supply the local townships. Due to the aging condition of the existing transformer bunds a new containment system was required to allow for the containment of water and oils should there ever be a fault with the transformer. Multiworks provided all upgrade works at the two substations to upgrade this existing oil containment system. This involved the construction of new primary spill oil tanks, upgrade of existing bunds, installation of new connecting pipework for both substations and flame traps for Mount Piper only.
Adding to the complexity of this scope was the proximity of the proposed containment systems to the adjacent high-voltage and in-service electrical equipment. Multiworks took over the design of this element to create a piling retention system adjacent to the structures and to ensure the site remained operational through the work.
The Victorian Government has mandated the rollout of Rapid Earth Fault Current Limiter (REFCL) installations across nominated Zone Substations in AusNet Services’ network, including at the Lilydale Zone Substation. Installation works included:
- Two new REFCL(s) units in bunds and footings
- Two new 22kV switched neutral bus kiosks onto new footings
- A new REFCL Room on to new pad footings to house associated inverters and control equipment
- A new modular Control Room onto new striped footings
- A new cable trench (600mm Wide x 600mm Deep) running north west to south east for associated control cables Conduits for control cables
- Associated reinstatement and surfacing
Replacement works involved:
- The existing NER with one new NER onto new pad footing
- Existing station service transformers (SSTx) with two new 750 kVA kiosk type units onto new pad footings and AC changeover boards
- Both existing Capacitor Banks with Metal enclosed Cap Banks with pad footings for REFCL compliance.
The Heywood Terminal Station (HYTS) 500 kV CB Replacement project includes establishment of two new 500 kV switch-bays to convert the incoming MOPS and TRTS line bays to a double-switched arrangement.
Multiworks was engaged by Zinfra to carry out all civil work associated with the project scope, including:
- Replacement of existing MOPS/TRTS line bay ROIs, CVTs and Surge Arresters
- Replacement of M1 and M2 transformer 500 kV Surge Arresters
- Decommissioning of 22 kV No.3 station services transformer
- Replacement of the 415 V station services infrastructure
- Installation of new 500kV Bus protection, new X & Y CBM scheme
As part of an ongoing maintenance program Citipower/Powercor is upgrading and structurally reinforcing many of its underground cable pits within Melbourne’s CBD.
Multiworks was engaged by Citipower/ Powercor to rectify the Exhibition Street pit following cracking and subsidence to its lid.
Upgrade works were complex due to the pit’s location within high density areas, their confined size and pre-existing structural issues.
The works were staged during shutdowns and involved crews operating 24 hours per day to access, reinforce and reinstall pit lids over a weekend period.
Multiworks’ effective collaboration with key stakeholders and Citipower/Powercor ensured the works were completed over the planned weekend shutdown period.
Part of AusNet Services’ landmark Edison Project, Multiworks has contributed to the upgrade and replacement of aging electrical infrastructure and equipment at Richmond, Brunswick and West Melbourne terminal stations. The upgraded terminal stations deliver new technologies to support inner Melbourne’s increasing population growth and power needs.
Multiworks was responsible for major civil, demolition and landscaping works to complete the project after another contractor was unable to execute the works.
Engaged by CPP directly, Multiworks was responsible for the construction of the in-situ brick control building at Deer Park Terminal station – constructed to house the site’s new electrical high voltage equipment. Multiworks was responsible for the installation of all related services including security, HVAC, lighting and fire detection. Despite a two-month delay associated with the building permit, Multiworks achieved handover of the completed building in time for testing and commissioning by the original project deadline. Multiworks was awarded additional scope including fencing and earthing works.
Multiworks was engaged by Ausnet Services for the design and construction of an architectural fence and landscaping works to screen the South Morang Zone Substation.
Multiworks’ effective stakeholder engagement process involved close consultation with Ausnet and the City of Whittlesea Council to develop an aesthetically pleasing fence solution that incorporated the colours of each of the organisation’s logos.
The resulting architectural fence design comprised a combination of slender steel frames and precast concrete panels to support a colourful plastic façade.
The foundation layout design required careful consideration to ensure safe approach distances were maintained for the surrounding 22kV feeder cables.
The foundations for the architectural elements included 28 pad footings and over 155 lineal metres of strip footings for the steel frames and precast concrete panels.
The decorative cladding material covering the steel frames and precast panels comprised 20mm thick sheets of recycled high-density polyethylene. These were fixed to the structure at over 4,000 locations, each with a custom-made HDPE cap that covers the fixing.
The landscaping works prioritised Australian native species including removal of aggressive foreign species and protecting three magnificent heritage listed River Red Gums and the habitat they provide.
With over 3,500 new plantings, carefully placed rock work and a sensational architectural fence, Multiworks met client and community objectives while successfully completing the project on time. All while maintaining an impeccable safety record.
Following the award of the Mentone Zone Substation Multiworks secured the delivery of refurbishment works at the Noble Park Zone Substation. The similarities between the two projects enabled Multiworks to capitalise on available economies of scale and to resource both jobs efficiently. The project works included:
- Construction of a 22kV Control Room
- Significant infrastructure works
- Considerable installation of conduit runs
- Resurfacing & reinstatement of roadway.
The Mentone Substation is situated on a site with significant space constraints. Multiworks successfully managed refurbishment works, including:
- Construction of a 22 kV Control Room including a cable basement
- Major upgrades to existing site buildings
- Construction of a 220kV transformer enclosure
- Over 700 lineal meters of trenching and conduit installation
- Installation of an environmental drainage system.
Multiworks successfully completed 95% of works at the new Cranbourne Zone Substation two months ahead of schedule. This was achieved despite 45 days lost due to wet weather.
Project scope involved:
- Construction of new heavy-duty access roads capable of carrying the load of the new transformers
- Benching of new substation site with 22,000m3 of fill and compact to 98%
- Construction of over 400m3 of reinforced concrete foundations for new primary plant and buildings
- Installation of conduits
- Installation of environmental runoff tank and bund walls to radiator foundation
- Installation of new septic tank
- Construction and installation of asphalt roadway, kerbing and bollards.
