Online Condition Monitoring System For Transformer

Short Descrption for Online Condition Monitoring System For Transformer

Our Online Condition Monitoring System for Transformers is your gateway to uninterrupted power supply. This advanced technology allows you to keep a constant watch on your transformers, ensuring they perform optimally and preventing costly downtime. By monitoring key parameters and analyzing data in real-time, you can detect potential issues early, make informed decisions, and execute timely maintenance or repairs. Say goodbye to unexpected outages and hello to a more reliable power infrastructure with our state-of-the-art monitoring system.

Detail description


 LDLUDLAccuracy*RepeatabilityAvailable in Rapid Mode
Hydrogen (H₂)5 –5,000 ppm± LDL or ±5%< 3%
Carb. Monox. (CO)1 –50,000 ppm± LDL or ±3%< 2%
Methane (CH₄)2 –50,000 ppm± LDL or ±3%< 2% 
Acetylene (C₂H₂)0.5 –50,000 ppm± LDL or ±3%< 2%
Ethylene (C₂H₄)1 –50,000 ppm± LDL or ±3%< 2% 
Carb. Diox. (CO₂)20 –50,000 ppm± LDL or ±3%< 3%
Ethane (C₂H₆)1 –50,000 ppm± LDL or ±3%< 2% 
Oxygen (O₂)100 –50,000 ppm± LDL or ±5%< 2%
Nitrogen (N₂) **10,000 –100,000 ppm± LDL or ±15%  
Moisture (H₂O)0 –100% RS (in ppm)± 3% RH< 3%

*whichever is greater. Accuracy quoted is the accuracy of the detectors during calibration. Gas-in-oil measurement may be affected by oil type and condition. Repeatability as measured from final production test data.
** N₂ value is calculated and available on free-breathing transformers only.


4x sunlight visible LED arrays
Backlit 7” inch color resistive touch LCD screen (800 x 480)
Integrated embedded secure webserver (https)

Analogue Inputs

Up to 15x optional analogue inputs for load CTs, PT100 inputs or 4–20mA sensors

Digital Output

USB port (type B connector) for local connection to laptop computer for configuring the system
Wi-Fi (802.11b/g/n)
Serial output (RS-485)
1Gb Ethernet (RJ45) standard with fiber-optic options
GSM/GPRS or CDMA/LTE modem options

Digital Protocols

Modbus® as standard
DNP3 or IEC 61850 (Ed 1 or 2) options


Alarm setting screens/scenarios, based on gas level, gas rate of change and moisture level, assignable to relays
6x standard and up to 18x dry contact relays (type C, SPDT), NO/NC, 10A at 250Vac resistive load, 10A at 30Vdc resistive
load Separate Service Alarm with own relay



Operating ambient temperature :- -40°C to +55°C (-40°F to +131°F)

Operating ambient humidity :- 0-95% RH, non-condensing

Oil temperature at valve*** :- -20°C to +120°C (-4°F to +248°F)

Oil pressure at valve :- 0-700KPa (0-100psi)


***Based on testing carried out using VOLTESSO™ 35 mineral oil, over a ¼” pipe run of 10 metres or less from oil supply or
return valve to monitor connection point and on transformer oil supply valve volumes of 200ml or less. For oil temperatures
colder than -20ºC, GE recommends the use of heat trace cabling on piping.


IP56 certified
Powder coated aluminium (RAL9002)
Unpainted 316 Stainless Steel option

Power Requirements

AC :-Nominal 100-240 Vac, Range 85-264 Vac, 4A

DC :- Nominal 100-250 Vdc, Range 90-300 Vdc



 Analysis UnitHub Unit
Dimensions600 x 484 x 330 mm600 x 380 x 330 mm
 23.6 x 19.1 x 13.0 in23.6 x 15.0 x 13.0 in
 73.6 lb40.8 lb

Power transformers are the backbone of our electrical infrastructure, facilitating the efficient transmission of electricity across long distances. They play a critical role in ensuring a stable and reliable power supply to homes, businesses, and industries. However, these transformers are subjected to various stresses and environmental conditions that can lead to wear and tear over time. To guarantee uninterrupted power supply and prevent costly downtime, it’s imperative to monitor the condition of these transformers continuously. This is where Online Condition Monitoring Systems for Transformers come into play.

The Importance of Transformer Condition Monitoring

Dissolved Gas Analysis (DGA) and moisture measurement of insulating fluids are recognized as the most important tests for assessing the condition of transformers. Traditionally, multi-gas DGA has been confined to laboratory environments, with infrequent off-line manual sampling forming part of time-based maintenance strategies. However, as the global average age of transformers continued to rise, the possibility of rapid aging, unplanned outages, and even catastrophic failure between off-line tests increased significantly. This necessitated the adoption of on-line DGA monitoring strategies to enhance network reliability.

The Evolution of On-line DGA

In the early 2000s, GE’s Kelman™ range of analyzers revolutionized on-line multi-gas DGA by eliminating the need for consumables and offering a calibration-free solution. Building on this legacy, GE proudly introduces the Kelman DGA 900, the next generation multi-gas on-line DGA and moisture analyzer. This advanced system leverages an evolved implementation of GE’s proven Photo-Acoustic Spectroscopy (PAS) measurement technology, providing precision and repeatability that rivals laboratory standards. The Kelman DGA 900 incorporates over 40 years of global DGA vendor experience, delivering improved performance, innovative features, an enhanced user experience, and increased robustness.

Key Benefits of Online Condition Monitoring

  1. Remote Alert and Multi-Gas Diagnostics

The Online Condition Monitoring System for Transformers offers remote alerts and multi-gas diagnostics to detect deteriorating transformer conditions. By constantly monitoring key parameters, the system can identify potential issues in their early stages. This proactive approach allows for timely maintenance or repairs, significantly reducing the risk of unexpected outages and costly downtime.

  1. Real-time Decision Making

One of the most significant advantages of an online monitoring system is its ability to provide real-time data and insights. Instead of waiting for manual oil sampling and laboratory testing, asset owners can make informed decisions promptly. This includes assessing transformer conditions, identifying issues, and planning maintenance or replacements as necessary.

  1. Early Issue Detection

With on-line monitoring, issues can be detected in their infancy. This early detection capability is invaluable in preventing catastrophic failures and unexpected outages. By addressing problems before they escalate, asset owners can ensure the longevity and reliability of their transformers.

  1. Data-Driven Maintenance Strategies

Online condition monitoring anchors maintenance and replacement strategies in hard data. The system collects and analyzes a wealth of information, allowing asset owners to develop data-driven strategies for transformer maintenance. This shift from time-based to condition-based maintenance can result in significant cost savings and improved reliability.

  1. Calibration-Free Operation

The Kelman DGA 900, part of the Online Condition Monitoring System, eliminates the need for frequent recalibration. Thanks to its PAS measurement technology, the system provides laboratory-quality precision without the hassle of consumables or constant calibration, ensuring it operates at optimum performance consistently.

  1. Rapid Mode for Fast Developing Faults

The Kelman DGA 900 features a “Rapid Mode,” which provides near real-time insight into fast-developing faults. This quick response is crucial for addressing issues that may escalate rapidly and cause significant damage to the transformer.

  1. Highly Scalable and Integrated

The system boasts enhanced computing power and a highly scalable input/output configuration. Its integrated Human-Machine Interface (HMI) provides a powerful and flexible solution for monitoring transformers, making it suitable for various transformer sizes and configurations.

  1. Compatibility with Different Insulating Fluids

The Online Condition Monitoring System is compatible with both mineral insulating oils and newer ester-based fluids, whether natural or synthetic. This flexibility ensures it can be used across a wide range of transformers, making it a versatile solution for asset owners.

Who are We?



Where do we have clients and supply our Online Condition Monitoring System For Transformer ?

IndiaUnited Arab EmiratesUganda
South KoreaAlgeriaSouth Africa
Saudi ArabiaEthiopiaAustralia

Advantages of Online Condition Monitoring System for Transformers

The implementation of an Online Condition Monitoring System for Transformers offers numerous advantages that can significantly enhance the reliability, efficiency, and longevity of these critical assets. Here are some key advantages:

  1. Early Issue Detection: One of the primary benefits of an online condition monitoring system is the early detection of potential issues. It allows for the identification of problems in their infancy, preventing them from escalating into more severe and costly faults. This proactive approach can extend the operational life of transformers.

  2. Real-time Data: Online monitoring systems provide real-time data on the condition of transformers. This data is crucial for making timely decisions, especially in critical situations. Asset owners can access up-to-the-minute information and take immediate action to prevent outages and failures.

  3. Remote Alerts: Online systems are equipped with remote alert capabilities. This means that personnel can receive alerts and notifications about developing issues even when they are not on-site. This remote monitoring ensures that problems are addressed promptly, reducing downtime and minimizing the risk of costly damage.

  4. Data-driven Maintenance: Online monitoring systems collect a wealth of data, which can be used to develop data-driven maintenance strategies. Instead of relying on traditional time-based maintenance, asset owners can schedule maintenance based on the actual condition of the transformer. This leads to more efficient and cost-effective maintenance practices.

  5. Preventive Measures: Online condition monitoring systems not only detect issues but also provide insights into preventive measures. By addressing problems at an early stage, asset owners can take preventive actions to avoid costly damage, improve transformer insulation, and extend the transformer’s life.

  6. Calibration-free Operation: Many modern online monitoring systems, like the Kelman DGA 900, are designed to operate without frequent recalibration. This eliminates the need for constant maintenance and calibration, reducing operational costs and ensuring the system functions at its peak performance.

  7. Compatibility: Online monitoring systems are compatible with various types of insulating fluids, including both traditional mineral oils and newer ester-based fluids. This versatility makes them suitable for use with a wide range of transformers, regardless of the fluid used.

  8. Scalability: Online monitoring systems are highly scalable, allowing them to be used with transformers of different sizes and configurations. This scalability ensures that the system can meet the specific needs of various transformers within a single network.

  9. Enhanced Safety: By detecting issues early and allowing for remote monitoring, online condition monitoring systems contribute to enhanced safety. They help prevent catastrophic failures that can pose risks to personnel and the environment.

  10. Cost Savings: While investing in an online monitoring system represents an upfront cost, the long-term benefits far outweigh this initial expenditure. The cost savings associated with reduced downtime, more efficient maintenance, and extended transformer life make these systems a wise investment.