HV switchboard manufacturing and installation

Scope of Work

The scope of work covered by this specification includes, but is not limited to, the following principal items:

Disconnection and removal of three existing 33/0.433kV 3.0MVA transformers;
Disconnection and removal of two existing 11kV switchboards;
Disconnection and removal of one existing 48V D.C. power supply;
Disconnection and removal of two existing 315kVA kiosk substations;
Supply and installation of earthing system to existing 33/11kV transformer bays;
Cutting and forming of new cable trenches in the existing Intake Sub Station, including cutting of
existing concrete floor, excavation, steel reinforcing, formwork, concrete work, steel framing and
provision of trench covers;
Extension of existing Cat. A underground conduits from transformer bays into new cable trenches in
the Intake Sub Station;
Supply and installation of two 6.0/7.5MVA 33/11kV transformers;
Supply and installation of two 3.0MVA 11/0.433kV transformers;
Supply and installation of two 11kV switchboards;
Supply and installation of new dual redundant 48V D.C. power supplies;
Supply and installation of central control, protection and monitoring equipment;
Supply and installation of two 1.6MVA kiosk substations, including civil works as required;
Connection of transformer alarm and trip signals;
Connection of transformer On Load Tap Changer (OLTC) controls for Master / Follower / Independent
modes of operation;
Supply and installation of HV and LV power cables;
Supply and installation of all associated LV control and monitoring cables, including transformer and
switchgear alarms, switchgear inter-trips, electrical interlocks and transformer On Load Tap Changer
(OLTC) control and monitoring;
Testing and commissioning (including VLF testing) of all HV cables, connections and terminations;
Setting up of protection relays and programming of central control, protection and monitoring
equipment to provide all control, protection and monitoring functions in accordance with this
specification and associated drawings;

48DC battery charger

11kV switch-gear

Standards and Referenced Documents

The work shall comply with the requirements of the contract documents and of the following Standards:

AS 1102 (Series) Graphical symbols for electro-technical documentation;
AS 1243 Voltage transformers for measurement and protection;
AS 1319 Safety signs for the occupational environment;
AS/NZS 1554 Structural Steel Welding Set (series);
AS 1627.4 Code of practice for preparation and pre-treatment of metal surfaces prior to protective coating – Abrasive blast cleaning of steel surfaces;
CAS 1670.1 Fire detection, warning, control and intercom systems – System design, installation and commissioning;
AS 1767 Insulating oil for transformers and switchgear;
AS 1824 Insulation co-ordination;
AS 1882 Earth and bonding clamps;
AS 1883 Maintenance and supervision of insulating oils in service;
AS 2067 Substations and high voltage installations exceeding 1kV a.c.;
Supply and installation of central control, protection and monitoring equipment;
AS 2184 Moulded case circuit breakers for rated voltages up to and including 600V ac and 250V dc;
AS 2467 Maintenance of electrical switchgear;
AS/NZS 3000 SAA Wiring Rules;
AS/NZS 3008 Selection of cables;
AS/NZS 3439 Low voltage switchgear and control gear assemblies;
AS/NZS 4680 Hot dipped galvanised coatings on ferrous articles;
AS 60044.1 Current transformers;
AS 60044.2 Inductive voltage transformers;
AS 60265.1 High voltage switches – Switches for rated voltages above 1kV and less than 52kV;
AS 60529 Degrees of protection provided by enclosures for electrical equipment;
AS 60947.2 Low voltage switchgear and control gear – circuit breakers;
S/NZS 61000 (Series) Electromagnetic Compatibility (EMC);
AAS 62271 (Series) High voltage switchgear and control gear;
EC 60255 (Series) Measuring relays and protection equipment

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