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Instrument Transformers

CT
VT
CVT

Precision, Reliability & Performance for Modern High-Voltage Networks

Insulect high-voltage current and voltage transformers are engineered for accuracy, safety, and long-term stability in demanding power systems. With advanced manufacturing and world-class testing facilities up to 1000 kV, our instrument transformers ensure dependable performance across transmission, distribution, industrial, and infrastructure applications. 

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Made for Demanding Environments

Insulect instrument transformers can be used in electric power networks, industrial plants, petrochemical facilities, rail systems, and the metallurgy sector, where precise measurement, metering, and protection are critical. The product range includes 35–500 kV oil-immersed current transformers, SF₆-insulated current transformers, capacitor voltage transformers (CVTs), electromagnetic VTs, and GIS-integrated gas-insulated VTs, each designed for outdoor, high-voltage, and high-pollution environments. These transformers support functions such as revenue metering, relay protection, power quality monitoring, PLC communication (CVTs), and reliable isolation of high-voltage systems.

Accurate Measurement & Reliable Protection

Modern high‑voltage networks require transformers that maintain precision while withstanding harsh outdoor conditions, high fault currents, and long cycles of operation. Our instrument transformers eliminate measurement error, prevent insulation breakdown, resist temperature and pollution stresses, and ensure stable performance through advanced insulation systems—such as oil‑paper capacitor insulation, SF₆ gas insulation, and shielded electrode structures. They provide long‑term sealing, low partial discharge, and high thermal/dynamic current capability, ensuring reliable metering and protection under severe electrical and environmental stress.
TECHNICAL

Features & Functionality

Instrument Transformer
High Measurement Accuracy

Precision grades up to 0.1 and 0.2S are achieved through microcrystalline alloy cores, optimized shielding, and flux‑leakage‑free coil designs.

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Robust Insulation & Sealing
Oil‑paper, SF₆‑gas, and composite insulation systems deliver high dielectric strength, low partial discharge, and sealing levels meeting IP55 for dust‑ and waterproof performance.
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High Thermal & Dynamic Current Strength
Primary conductors support short‑time thermal currents up to 63kA/3s and dynamic currents up to 160kA, ensuring stability during system faults. 

 

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Durable Outdoor Construction
High‑strength porcelain or silicone rubber bushings, stainless steel components, and corrosion‑resistant housings guarantee long‑term reliability even in high‑pollution or severe‑weather regions.

Functionality & Options

  • Supports precision current and voltage measurement for metering and protection circuits.

  • Provides relay protection accuracy, including classes 5P, 10P, TPY, and TPS for fault detection.

  • Offers PLC communication capability through capacitor voltage transformers (CVTs).

  • Allows multiple secondary windings for simultaneous metering, protection, and residual‑voltage functions.

  • Includes optional bushings, gas density monitoring, and explosion‑relief systems for enhanced safety.

Key Technical Specifications

  • Voltage range: 35–500kV across CTs, VTs, CVTs, and GIS‑VTs.

  • Accuracy Classes: 0.1, 0.2, 0.2S, 0.5, 0.5S, 5P, 10P, TPY/TPS depending on model.

  • Insulation Strength: Lightning impulse withstand voltage up to 1930kV (500kV class).

  • Thermal/Dynamic Ratings: Up to 63kA/3s thermal and 160kA dynamic current withstand.

  • Environmental Durability: SF₆ leakage rate <0.5%/year, IP55 terminal boxes, and pollution class W2/W3 options.

EXPERIENCE

Our Projects featuring Insulect Substations

Explore our project highlights to see where Insulect Substations are making an impact.
For tailored advice on whether this solution suits your network, please connect with our team here.

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Wunghnu Solar Farm
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Fortescue Aldoga, New 275kV Substation Switchgear

Where you'll find our Substation

You'll find Insulect-supplied and installed Substations across Australia and New Zealand -- our locally built Insulect range and imported Sieyuan range.

ADVANTAGES

Why Choose Insulect for Instrument Transformers

Our instrument transformers combine high accuracy, advanced insulation, and robust mechanical strength, making them an ideal choice for modern high‑voltage networks. From oil‑immersed CTs to SF₆‑insulated VTs and CVTs with PLC capabilities, the product line offers complete solutions for metering, protection, and communication. 

World‑Class Manufacturing & Testing
With five high‑voltage laboratories capable of 1000kV impulse and withstand tests, advanced vacuum drying, and imported production equipment, our facilities ensure the highest build quality.
Proven Reliability & Compliance
Meet IEC/IEEE standards for precision, insulation, and protection performance—ensuring confidence in long‑term grid operation.
High‑Strength Designs for Harsh Environments
With five high-voltage laboratories capable of 1000 kV impulse and withstand tests, advanced vacuum drying, and imported production equipment, our products are built to deliver reliable performance and precision.
IMPLEMENTATION

Services & Support

Insulect offers comprehensive services and support for the products we manufacture and specialise in, enhancing value for local utilities, major energy users, equipment manufacturers, and service operators. 

LOCAL TECHNICAL TEAM

Our local technical team provides exceptional support and expertise, ensuring quick response times and personalised service to tackle any challenges that may arise during project execution.

  
ENGINEERING DESIGN

Our team utilises advanced technology and industry knowledge to develop innovative and efficient high-voltage switchgear solutions, customised to fit the unique requirements of each project.


  
PROCUREMENT & LOGISTICS

We facilitate smooth procurement and logistics processes by sourcing from trusted, proven partners and coordinating timely deliveries, ensuring projects remain on schedule and within budget.


  
TESTING & COMMISSIONING
Professional testing and commissioning support ensure that every high-voltage switchgear system functions safely and reliably, adhering to all regulatory standards and client expectations.
  
TURNKEY PROJECT DELIVERY

We are able to oversee every phase from concept to completion, providing comprehensive solutions that simplify complex projects and ensure successful outcomes.

  
FACTORY VISITS
We facilitate client visits to our local manufacturing sites here in Australia, as well as overseas, for initial inspection as well as factory acceptance testing.
  
FROM THE BLOG

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We built for reliability, safety, and compliance — our products are designed to perform in the toughest environments. Talk to our team to ensure you're specifying the right product for your application.
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