Transformer Gas Analyser: Transformer Health and Reliability

A Transformer Gas Analyser is a crucial tool for maintaining the health and reliability of transformers in power distribution systems. By continuously monitoring the gases dissolved in transformer oil, this specialized equipment can detect incipient faults such as partial discharges, overheating, and other issues in their early stages, allowing for timely preventive measures. The system offers customization options to meet various industry standards and regulatory requirements, ensuring compliance with relevant guidelines.

Its precision in gas analysis, comprehensive fault detection capabilities, and regulatory approvals from organizations like NTPC and ERDA make it an indispensable asset for transformer maintenance. This proactive approach not only enhances transformer reliability but also leads to cost savings and improved operational efficiency, ultimately contributing to uninterrupted power distribution.

Detail description

Range

	LDL	UDL	Accuracy*	Repeatability	Available 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 transformer only.

FEATURES

Display
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

Alarms

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

ENVIRONMENT

Conditions

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.

Enclosure

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

Mechanical

	Analysis Unit	Hub Unit
Dimensions	600 x 484 x 330 mm	600 x 380 x 330 mm
	23.6 x 19.1 x 13.0 in	23.6 x 15.0 x 13.0 in
Weight	33.4Kg	18.5Kg
	73.6 lb	40.8 lb

Transformers are crucial components in power distribution systems, playing a pivotal role in maintaining an uninterrupted flow of electricity. As the backbone of the electrical grid, transformers are subject to a wide range of operating conditions, making their health and reliability of paramount importance. Transformers are not immune to wear and tear, and their continuous operation under varying loads, temperature fluctuations, and electrical stresses can lead to the gradual degradation of their insulation and other critical components. As transformers age, the risk of developing incipient faults, unplanned outages, and catastrophic failures becomes more pronounced. To address these concerns, asset owners and operators are turning to advanced diagnostic tools, with Dissolved Gas Analysis (DGA) emerging as a fundamental technique for assessing the condition of transformers.

Dissolved Gas Analysis (DGA) – A Transformative Diagnostic Tool

DGA is widely acknowledged as one of the most essential tests for evaluating the health of transformers. By examining the gases dissolved in the insulating oil of a transformer, DGA provides invaluable insights into the transformer’s condition. This diagnostic method can detect the presence of specific gases generated during the decomposition of oil and paper insulation. The quantity and composition of these gases can vary depending on the type and severity of fault conditions, including arcing, partial discharges, overheating, and more. The key gases typically identified in DGA include hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2), and nitrogen (N2).

Traditionally, DGA was confined to laboratory settings, with off-line manual sampling as part of time-based maintenance strategies. While this approach provided valuable data, it had limitations. Off-line sampling was typically performed at infrequent intervals, leaving the transformer vulnerable to unforeseen issues between tests. As the global average age of transformers continued to rise, the industry recognized the need for more proactive monitoring to ensure the reliability and longevity of these critical assets.

GE’s Kelman™ Analyzers – A Pioneering Solution

In response to the growing demand for proactive monitoring and diagnostics, General Electric (GE) introduced the Kelman™ range of analyzers, bringing consumable-free, on-line multi-gas DGA to the market. These analyzers marked a significant advancement in transformer health assessment, enabling asset owners to remotely monitor their transformers’ condition and take timely preventive actions.

Now, GE proudly introduces the Kelman DGA 900, the next generation of multi-gas on-line DGA and moisture analyzers. The Kelman DGA 900 builds on over 40 years of global DGA vendor experience and is designed to deliver improved performance, innovative features, enhanced user experience, and increased robustness. At its core, the Kelman DGA 900 relies on GE’s proven Photo-Acoustic Spectroscopy (PAS) measurement technology, which offers precision and repeatability comparable to laboratory standards. Notably, the Kelman DGA 900 requires no consumables and eliminates the need for frequent recalibration, ensuring cost-effectiveness and reliability.

Key Benefits of the Kelman DGA 900

1. Remote Alert and Multi-Gas Diagnostic Capability: The Kelman DGA 900 provides real-time alerts and multi-gas diagnostics for deteriorating transformer conditions. This capability allows operators to make informed decisions without the need for manual oil sampling.
2. Early Fault Detection: The analyzer is designed to detect issues in their infancy, facilitating planned outages and avoiding unexpected failures. This proactive approach enhances transformer reliability and minimizes downtime.
3. Data-Driven Maintenance Strategies: The Kelman DGA 900 anchors condition-based maintenance and asset replacement strategies on hard data, enabling asset owners to optimize their maintenance efforts.
4. Consumable-Free Operation: With no need for consumables or frequent recalibration, the Kelman DGA 900 operates at optimum performance while keeping operational costs in check.
5. Rapid Mode for Real-Time Insights: The “Rapid Mode” feature provides near real-time insight into fast-developing faults, allowing operators to respond swiftly to critical issues.
6. Scalable and Flexible Monitoring Solution: The analyzer features enhanced computing power, highly scalable I/Os, and an integrated Human-Machine Interface (HMI), making it a powerful and flexible transformer monitoring solution.
7. Compatibility with Various Insulating Fluids: The Kelman DGA 900 is compatible with both mineral insulating oils and newer ester-based fluids, including natural and synthetic variants

Who are We?

Manufacturer

supplier

trader

importer

exporter

company

solution

Where do we have clients and supply our Transformer Gas Analyser?

India	United Arab Emirates	Uganda
Nepal	Israel	Tanzania
Vietnam	Egypt	Angola
Philippines	Yemen	Kambia
Indonesia	Turkey	Malawi
Malaysia	Sudan	Botswana
South Korea	Algeria	South Africa
Oman	Monaco	Zimbabwe
Iran	Nigeria	Cambodia
Saudi Arabia	Ethiopia	Australia
Namibia	Greece	USA

Advantages of Transformer Gas Analyser

1. Early Fault Detection: Transformer gas analyser enable the early detection of faults and abnormalities within the transformer. By monitoring the dissolved gases in the insulating oil, these analyzers can identify incipient issues such as overheating, arcing, and partial discharges. Detecting problems at an early stage allows for timely preventive measures, reducing the risk of catastrophic failures and minimizing downtime.
2. Remote Monitoring: Transformer gas analyser provide the advantage of remote monitoring. This means that operators can continuously assess the transformer’s condition without the need for manual, on-site inspections. Remote monitoring allows for proactive decision-making and rapid responses to emerging issues.
3. In-Depth Diagnostic Capabilities: These analyzers offer multi-gas diagnostic capabilities, allowing operators to assess the transformer’s health comprehensively. By analyzing a range of gases, including hydrogen, methane, ethylene, acetylene, and more, they provide valuable insights into the transformer’s condition. This in-depth analysis helps in identifying the specific type and severity of faults.
4. Condition-Based Maintenance: The data generated by transformer gas analysers anchors maintenance strategies in condition-based practices. This approach ensures that maintenance efforts are directed precisely where they are needed, optimizing the use of resources and minimizing unnecessary maintenance.
5. Consumable-Free Operation: One of the significant advantages of modern transformer gas analysers is their consumable-free operation. Unlike older methods that required frequent recalibration and consumable materials, these analyzers are cost-effective and require minimal maintenance.
6. Real-Time Insights: Some transformer gas analyser feature a “Rapid Mode” that provides near real-time insights into fast-developing faults. This capability is invaluable for making swift and informed decisions to address critical issues promptly.
7. Scalable and Flexible Solutions: Transformer gas analyzers are highly scalable and offer flexibility in their monitoring capabilities. They can adapt to different transformer configurations, making them suitable for a wide range of applications.
8. Compatibility with Various Insulating Fluids: These analyzers are designed to work with different types of insulating fluids, including traditional mineral oils and newer ester-based fluids (both natural and synthetic). This compatibility ensures that the analyzers can be applied to a variety of transformers.
9. Enhanced User Experience: Transformer gas analysers, like the Kelman DGA 900, incorporate advancements that enhance the user experience. These improvements make the analyzers user-friendly and more effective in assessing transformer health.
10. Asset Reliability: By providing a continuous assessment of transformer health, gas analyzers contribute to the overall reliability of power distribution systems. They help prevent unplanned outages and equipment failures, ensuring a consistent and dependable power supply.