Failures in tap changers account for over 20% of transformer failures, often resulting in fire or explosions.
Arcing, heating, mechanical frictions and wear are the key factors leading to OLTC failures. While the condition of tap changer can be assessed with regular testing, this is often time consuming for asset managers and costly.
Maintenance is typically scheduled based on the number of operations and is particularly intrusive, involving human intervention that can possibly cause unexpected issues compromising the tap changer operation.
TOTUS monitors and integrates key parameters on the tap changer such as tap position, motor current and temperatures to highlight deviations over time, enabling enhanced maintenance strategies for asset managers.
Benefits of Monitoring OLTC with TOTUS
TOTUS provides a variety of solutions for all varieties of OLTC, from simple tracking of temperatures and tap position, up to providing a full 8-gas DGA monitor.
By monitoring online the tap position, OLTC temperature, Dissolved Gas Analysis, motor torque and load, asset managers can detect anomalies at the earliest stage and plan proper action and testing. This drives more efficient maintenance, allowing the time periods between maintenance to be stretched.
Although Vacuum OLTC technologies can provide significant maintenance advantages, it is not free from failures and issues, due to poor vacuum, poor internal clearance between live parts, moisture contamination, mechanical failures and failures in the CT shorting switch.
Meeting Key Challenges for Asset Managers
Monitoring with TOTUS provides the following benefits for Asset Managers;
Use of diagnostic standards for DGA
Continuous monitoring and supervision detecting early faults
More efficient maintenance, reducing costs (through condition based maintenance)
Integrated solution with Main Tank DGA and Arcing (same web platform, data correlation
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Duval Diagnostic Triangles for OLTC
An important benefit from the TOTUS solution is use of diagnostic standards for DGA, allowing for easy interpretation of results.
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