The flame test of gas trapped in the Buchholz relay is used to determine the presence of combustible gases within the transformer. These gases are produced as a result of internal faults, such as insulation breakdown or arcing in the transformer.
What is Buchholz Relay?
- The Buchholz relay is a gas-actuated protection device used in oil-filled power transformers. It is designed to detect gas accumulation due to internal faults, such as short circuits, overheating, or insulation failure.
- When an internal fault occurs, the transformer oil decomposes, producing gas. This gas rises and gets trapped in the Buchholz relay, triggering an alarm or trip signal.
Flame Test:
- As seen in the video, the gas ignition indicates the presence of combustible gases, which are typically produced during electrical faults within the transformer.
- The presence of combustible gases such as hydrogen, methane, or acetylene is a strong indication of a serious internal fault like arcing, overheating, or insulation failure.
- The transformer was immediately de-energized to prevent catastrophic failure, such as an explosion or fire.
- A thorough internal inspection was conducted to determine the exact nature and extent of the fault and repairs work was carried out.
Preventive Measures:
- Take oil samples and send for dissolved gas analysis (DGA) to detect early signs of faults.
- Implement a maintenance schedule to ensure the health of the transformer and its components. Check for the presence of any gas in Buchholz relay.
- Check all pressure relief devices and ensure that all protective relays and devices are functioning correctly to detect and mitigate faults before they escalate.
Our professionals confirmed the presence of combustible gases, and the transformer was immediately taken out of service to prevent further damage. FAP Power Solutions ensured thorough maintenance followed by testing of the transformer.
