Skip to main content

Transformer  Monitoring and Diagnostics

Transformer Monitoring and Diagnostics

Need to know condition of transformers in electricity networks is increasing when transformers are ageing. Up to date and accurate monitoring data is needed in particular from large and critical transformers. Such transformers are usually located in the transmission networks, heavy industry and power generation.


Analysis of a transformer oil sample by a laboratory is an established technique recognised as the most important test for monitoring power transformers. It has long been accepted that Dissolved Gas Analysis (DGA) of oil is the single most powerful tool in the field of transformer fault detection and asset management.


While on-line DGA is now widely accepted as the most effective method of assessing the condition of a transformer, it does not cover all the possible sources of issues. Sub-systems like the tap changer, the cooling system or the bushings can generate their own problems if they are left unmonitored.


GE’s line of Kelman, Hydran and Intellix products, now has a comprehensive offering of portable, on-line products and software for management of critical transformer assets. With these products transformer faults can be detected in early stage minimizing risks for costly unplanned outages and equipment failures.

Multigas online DGA for transformers

GE’s multiple gas DGA products consists of Kelman products, which are based on advanced Photo Acoustic Technology (Photo-Acoustic Spectroscopy). The key benefit of this technology is ability to measure levels of each fault gas separately and accurately.

Photo Acoustic Technology does not require calibration of the system or using carrier or calibration gases. This gives remarkable benefits and savings on operating and maintaining these units.

Kelman DGA 900

On-line DGA device monitoring all 9 fault gases plus moisture. The Kelman DGA 900 features an innovative two enclosure design, local/remote HMI and expandable analog/digital I/Os.

Kelman DGA 900 Plus

On-line DGA device monitoring all 9 fault gases plus moisture with dedicated options for Transformer Models / Cooling / OLTC and Bushing monitoring.

Kelman DGA 900 Taptrans

The Kelman DGA 900 TAPTRANS is a patented designed specifically for transformers with an On-Load Tap Changer (OLTC), which is recognized as one of the most vulnerable parts of the transformer and which accounts for a large portion of unplanned outages.

Kelman DGA 900 Multitrans

The Kelman DGA 900 MULTITRANS offers a discrete multigas on-line DGA and moisture monitoring across three adjacent single phase transformers, enabling a very cost effective monitoring solution.

Transfix DGA 500

On-line DGA monitoring device that measures 5 individual dissolved gases and moisture and provides both on-line monitoring and key exploratory diagnostics.

Kelman Minitrans

Entry level discrete gas DGA device monitoring 3 significant fault gases plus moisture.

Single / composite gas online DGA for transformers

Single gas DGA products provide real-time single or composite fault-gas and moisture in-oil measurement to alert persons about a potential issue. Products are easy to install on a single valve.

Hydran M2-X

Enhanced online fault gas and moisture DGA monitor which can easily be expanded to offer a more comprehensive transformer monitoring solution for utilities and industries. Single or composite gas and moisture.

Hydran 201Ti

Proven DGA sensing device for transformer fault gas, with an LCD display, alarm capabilities plus digital and analogue outputs of the gas value for remote monitoring. Measures single or composite gas.

Portable multigas DGA

Kelman Transport X2

Compact portable system that is designed for laboratory quality Dissolved Gas Analysis (DGA) on manually taken samples from transformers filled with mineral oil and ester fluids. It allows fast diagnostics in less than 30 mins through an improved graphical touchscreen user interface.

Online bushings monitoring

Intellix BMT 330

On-line system that continuously monitors the condition of bushings and can also detect developing partial discharge (PD) activity in the main tank. It will alert personnel of fault conditions at an early stage and provide vital health information on the bushings and the transformer.

Software solutions

Perception Fleet

GE’s Perception Fleet is a smart, simplified and standards-based software system that moves customers from a manual, one-on-one transformer assessment process to an automated and online fleet management assessment. By automatically evaluating the condition of assets and establishing their risk of failure, Perception Fleet is able to prioritize and rank assets within a fleet.

The Perception Fleet software provides customers comprehensive transformer fleet condition rankings, transformer risk information, and expert analysis on-demand, removing time-consuming and costly manual processes as well as unnecessary maintenance, helping focus capital and reduce operational expenses.