High-precision voltage conversion, current measurement, and distribution transformers customized for Australian utility specifications, municipal infrastructure, and industrial MV/HV substations.
Primary Voltage: 6.3kV / 11kV
Secondary Output: 110V / 240V
Application: Rural NSW distribution & auxiliary VT voltage metering.
Rating Range: 50kVA to 1500kVA
Vector Group: Dyn11 / Dyn1
Standard: AS/NZS 60076 & CPRI Type Tested.
Cooling Type: ONAN / ONAF
Frequency: 50Hz / 60Hz
Application: Sydney commercial precinct & industrial sub-stations.
Loss Standard: S11 High Efficiency Core
Enclosure: Sealed Wave Corrugated Tank
Feature: Zero Maintenance Design.
HV Rating: 11kV / 20kV / 33kV
LV Output: 400V / 415V
Certification: ISO 9001 / IS 2026 / AS Compliant.
Voltage Configuration: Custom HV stepping
Phase: 3-Phase 50Hz
Application: Heavy plant machinery & power conditioning.
HV Level: 20kV Grid Standard
Protection: Pressure Relief & Buchholz Relay
Cooling: ONAN Mineral / Ester Oil.
HV Primary: 13.8kV
LV Secondary: 240V / 480V Dual Output
Build Standard: Heavy-duty weather-proof tank.
An authoritative technical guide on core magnetic saturation, ratio error control, and insulation integrity under Australian AS/NZS 61869 grid connection guidelines.
In protective relaying applications across Sydney's medium-voltage (11kV, 22kV, 33kV) substations, Current Transformers (CTs) must maintain linear transformation ratios during high-magnitude short-circuit fault conditions. Our manufacturing facilities utilize high-permeability Cold Rolled Grain Oriented (CRGO) silicon steel cores (M4, M3, and Hi-B grades) as well as advanced amorphous metal alloys.
By precision-calculating the Knee-Point Voltage ($V_k$) and limiting the secondary winding resistance ($R_{ct}$), our protection Class 5P20 and 10P20 CTs ensure that protective relays detect phase-to-earth and phase-to-phase faults within milliseconds without core saturation—even under severe asymmetrical fault current transients exceeding 25kA/1s.
Sydney's climate experiences severe summer peak temperature excursions exceeding 40°C. Instrument transformers deployed in indoor Switchgear (GIS/AIS) or outdoor pad-mounted enclosures must be rated for continuous thermal burden without insulation degradation.
Our dry-type cast resin CTs and VTs utilize vacuum pressure impregnation (VPI) with Class F (155°C) and Class H (180°C) epoxy resins, guaranteeing Partial Discharge levels below 5 pico-Coulombs (pC) at 1.2 times maximum operational voltage ($U_m$). For outdoor installations, oil-immersed units are filled with high-flashpoint, PCB-free mineral oil (or biodegradable synthetic ester fluids), conforming to IEC 60296 and AS 1767 standards.
Tailored transformer solutions addressing localized grid challenges, space constraints, and harsh coastal environments across Greater Sydney.
The massive expansion around the Badgerys Creek Aerotropolis demands heavy-duty 33kV/11kV distribution transformers and ring main unit (RMU) CTs. Our compact pad-mounted ONAN transformers and cast-resin instrument transformers fit within tight kiosk substations, featuring high short-circuit withstand capacities to power 24/7 automated logistics hubs.
Sydney’s expanding passenger rail network requires high-reliability traction power sensing. We export specialized current transformers with severe transient over-voltage withstand capability and dry-type distribution units designed for underground tunnel substations where zero halogen and flame-retardant safety ratings (Class F1/E2) are mandatory.
Coastal Sydney infrastructure suffers from high atmospheric salinity. Our exporters supply transformers equipped with C4/C5-M ISO 12944 compliant multi-layer polyurethane coatings, 316 stainless steel hardware, and IP66 marine-grade secondary terminal boxes to prevent rust and salt-spray flashovers.
Mission-critical data centers in Sydney demand continuous non-stop power with Class 0.2S high-accuracy revenue metering CTs. Our low-loss S11-M oil-immersed and VPI dry-type transformers minimize operational heat, reducing auxiliary HVAC cooling energy consumption for hyperscale facilities.
Connecting utility-scale solar and battery storage into the TransGrid transmission corridor feeding Sydney requires multi-winding step-up transformers and specialized voltage transformers equipped with ferroresonance damping resistors to prevent network instability under capacitive loading.
Industrial plants operating high-current arc furnaces, induction heaters, and heavy motor drives generate extreme harmonic distortion. We manufacture custom rectifier transformers, motor starting autotransformers, and harmonic-filtered instrument CTs built to withstand THD levels up to 25%.
Understanding the transition toward digital substations, strict AS/NZS regulatory standards, and sustainable distribution infrastructure.
The New South Wales grid is rapidly transitioning toward digitized substation architectures under the Australian Energy Market Operator (AEMO) roadmap. Conventional copper secondary wiring is increasingly complemented by Low-Power Instrument Transformers (LPITs) and optical/Rogowski current sensors connected to optical Merging Units (MUs). Our modern instrument transformer manufacturing lines support both classical analog secondary outputs (1A, 5A, 110V) and digital optical interface integration.
Sydney procurement bodies enforce mandatory compliance with AS/NZS 61869.1 (General Requirements), AS/NZS 61869.2 (Current Transformers), and AS/NZS 61869.3 (Inductive Voltage Transformers). All our transformer designs undergo rigorous short-time current withstand, temperature rise, lightning impulse (BIL up to 170kV), and seismic withstand testing. Full type-test certificates from ILAC-MRA recognized bodies (such as CPRI) are standard with every export shipment.
| Transformer Category | Primary Voltage Range | Secondary Output / Ratio | Accuracy / Protection Class | Applicable Standards | Sydney Target Application |
|---|---|---|---|---|---|
| Current Transformers (CT) | 1kV to 33kV | 1A / 5A (Secondary) | 0.2S, 0.5S (Metering) / 5P20, 10P20 (Protection) | AS/NZS 61869-2, IEC 61869-2 | Ausgrid / Endeavour Switchgear & Substation Protection |
| Voltage Transformers (VT/PT) | 3.3kV to 33kV | 110V / 100V / 110/√3 V | 0.2, 0.5 (Revenue) / 3P, 6P (Protection) | AS/NZS 61869-3, IEC 61869-3 | Grid Feed Telemetry & Tariff Metering Cubicles |
| Oil-Immersed Distribution | 6.3kV to 33kV | 415V / 240V (3-Phase / 1-Phase) | Dyn11, Dyn1, Single Phase | AS/NZS 60076, IS 2026 / IS 1180 | Kiosk Substations, Commercial & Industrial Parks |
| Cast Resin Dry-Type | 3.3kV to 11kV | 415V / 400V | Class F (155°C) / Class H (180°C) | AS 60076.11, IS 11171 | Sydney Metro Underground & Indoor Commercial High-Rises |
| Rectifier / Special Units | Custom HV | Multi-Tap LV / Heavy DC Rectification | Custom Design / Low Harmonic THD | IEC 61378, Custom Spec | Sydney Heavy Manufacturing & Galvanizing Facilities |
Leveraging advanced manufacturing infrastructure, robust quality management systems, and CPRI-verified design protocols.
Founded in 1994, Chetan Electric Pvt. Ltd. is an ISO 9001 certified global leader in transformer design and export. Our modern manufacturing facility located in Bangalore, India, spans state-of-the-art winding bays, automated vacuum impregnation chambers, precision core cutting lines, and high-voltage testing laboratories.
Every single instrument and distribution transformer engineered for export to the Sydney market undergoes 100% mandatory routine testing in accordance with AS/NZS 60076 and AS/NZS 61869 guidelines, including:
Expert answers regarding standards compliance, atmospheric protection, export lead times, and custom core specifications.