Bushing Monitoring

Continuous Insight Into Bushing Health

Qualitrol’s advanced bushing monitoring technology is part of the QTMS Transformer Monitoring System. These monitoring modules provide continuous visibility into bushing condition by measuring capacitance, leakage current, temperature, and tan delta—key indicators of insulation health. Early detection of deterioration allows asset owners to prevent failures, reduce risk, and improve transformer reliability.

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Qualitrol QBMS Bushing Monitoring System, front

Application Overview

Qualitrol Bushing Monitoring is designed for online, real‑time assessment of high‑voltage transformer bushings. The system supports monitoring of up to six bushing taps per module and integrates seamlessly into QTMS for complete asset health visibility. It is suitable for transmission, distribution and industrial transformers, and can be deployed across single‑asset or fleet‑level monitoring structures through SmartSUB enterprise software.

What We Solve For

Bushing failures are among the leading causes of major transformer outages. Electrical insulation breakdown often originates long before it becomes visible. By continuously tracking capacitance changes, rising tan delta, leakage current shifts, and thermal behaviour, the Qualitrol bushing monitoring module identifies early deterioration so action can be taken before failure occurs. This reduces unscheduled downtime, enhances operational safety, and supports condition‑based maintenance programs.

TECHNICAL

Features & Functionality

Functionality & Options

Monitoring of up to six bushing taps per module (minimum three signals required).
Measures capacitance, tan delta, temperature, leakage current and reference voltage.
Temperature‑compensated tan delta for improved accuracy.
Integration through Ethernet ports, enabling connection to QTMS and SmartSUB enterprise systems.
Configurable alarm thresholds for tan delta, capacitance and temperature.
Designed for compatibility with existing QTMS chassis (STX, MTX, LTX).

Key Technical Specifications

Number of Bushings: Up to 6 inputs
Inputs: 6 × bushing current (equivalent voltage) signals; 6 × temperature signals; 6 × reference voltage signals
Tan Delta / Power Factor: better than ±0.0001 (0.1 mrad)
Capacitance: better than ±0.2%
Leakage current: better than ±0.1%
Reference voltage: better than ±0.1%
Operating Temperature: −20 °C to +72 °C (module specific)
Storage Temperature: −60 °C to +85 °C
Humidity: 5–95% non‑condensing
Enclosure rating: IP20 (higher ratings available)
Communications: Ethernet port; IEC 61850 / Modbus support through QTMS CPU module

EXPERIENCE

Our Projects featuring Insulect Transformers

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

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Advanced Transformer Bushing Monitoring: Preventing Failures Through Real-Time Insights

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Hour-by-Hour Monitoring: Detecting a Developing Transformer Fault with the Serveron TM8

ADVANTAGES

Why Choose Insulect for Bushing Monitoring

Before selecting a bushing monitoring solution, it’s important to choose a system backed by proven technology and a supplier capable of delivering the right product fit, support and expertise. At Insulect, we help customers deploy high‑performance bushing monitoring solutions with confidence.

Trusted, Well‑Established Technology

Qualitrol has a long history in transformer monitoring, and its bushing modules use accurate measurement methods that follow IEEE and IEC standards. This helps ensure the information you receive about bushing condition is consistent and reliable.

Flexible Integration Across Monitoring Platforms

Whether for new installations or upgrades, we supply bushing modules that integrate seamlessly into existing QTMS installations, supporting multiple transformer sizes and configurations. The modular design allows easy expansion and future upgrades.

Local Support and Product Expertise

We provide support throughout the selection, integration and commissioning process. We also help ensure correct module pairing, configuration and ongoing operation, so customers can rely on accurate bushing health data over the transformer’s lifetime.

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.