Pressure Detection

Early Fault Detection & Transformer Tank Protection

Sudden internal pressure rise is a critical indicator of electrical faults, insulation failure, or rapid gas generation inside oil‑filled equipment.

Insulect supplies Pressure Detection Devices from two globally recognised manufacturers – COMEM and Qualitrol – providing asset owners with proven solutions for early fault detection, alarm initiation, and transformer protection.

These devices form a key layer in transformer safety systems by detecting abnormal pressure conditions before catastrophic tank damage occurs.

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What Are Pressure Detection Devices?

Pressure detection devices continuously monitor internal pressure conditions within transformers and other oil‑ or gas‑filled electrical equipment. When a sudden or abnormal pressure rise occurs, the device rapidly changes contact state to:

Trigger alarms
Initiate trip signals
Support protective relay schemes

Different technologies are used depending on application requirements, including mechanical rapid pressure rise relays, pressure switches, and integrated safety devices combining pressure, temperature, and oil level monitoring.

Application Overview

Pressure detection devices supplied by Insulect are commonly installed on:

Power transformers (distribution and transmission)
Generator step‑up transformers
On‑load tap changer compartments
Hermetically sealed transformer
Conservator‑type transformers
Reactors and special oil‑filled apparatus

Solutions are suitable for oil space or gas space installation, indoor or outdoor use, and harsh environments including offshore and high‑vibration installations.

What We Solve For

Early Fault Detection

Detects abnormal internal pressure caused by arcing, insulation breakdown, or rapid gas evolution
Provides early warning before mechanical tank deformation or rupture

Equipment Protection

Enables fast tripping to minimise internal damage
Reduces the risk of oil leaks, fire, and environmental impact

Reliability & Compliance

Complements Buchholz relays and temperature protection devices
Supports transformer manufacturer protection philosophies

Fleet Compatibility

Mechanical and electromechanical options available
Suitable for retrofit and new transformer installations

Harsh Environment Operation

Designed to withstand vibration, pressure cycling, and extreme ambient temperatures

Product Range Overview

TECHNICAL

Core Functions

Depending on the device type, pressure detection systems operate by:

Monitoring internal pressure within oil or gas space
Detecting abnormal pressure rise rates or pressure thresholds
Actuating mechanically or electrically via changeover contacts
Initiating alarm or trip signals into protection circuits

Rapid pressure rise relays respond to the rate of pressure increase, not slow pressure changes caused by load or ambient temperature fluctuations, ensuring secure operation without nuisance trips.

Integrated safety devices combine pressure measurement with temperature and oil level monitoring to provide multi‑parameter protection within a single device.

Key Features

Mechanical or electromechanical pressure detection
Rapid pressure rise detection independent of static pressure level
Alarm and trip contacts for protection systems
Oil or gas space mounting options
High ingress protection (IP65–IP66)
Wide ambient temperature operation (down to –40°C)
Offshore and corrosion‑resistant configurations
Compatibility with SCADA and protection relays (model dependent)

IMPLEMENTATION

Services & Support

Insulect offers comprehensive services and support for the products we 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 EXPERTISE

Through Qualitrol and COMEM, our team utilises advanced technology and industry knowledge to assist customers.

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.