OLTC & OCTC Repairing/Servicing involves a meticulous process of diagnostic assessment, dismantling, cleaning, replacement, and reassembly, ensuring the optimal performance and reliability of On-Load Tap Changers and Off-Circuit Tap Changers in transformers.
Diagnostic Assessment: Commence the OLTC (On-Load Tap Changer) and OCTC (Off-Circuit Tap Changer) repairing/service process with a comprehensive diagnostic assessment, utilizing advanced diagnostic tools such as insulation resistance testers and winding resistance meters to identify any issues or abnormalities.
Dismantling and Inspection: Systematically dismantle the OLTC or OCTC for a thorough inspection, examining individual components such as contacts, resistors, and transition resistors. Identify worn-out or damaged parts that may require replacement or refurbishment.
Cleaning and Decontamination: Employ specialized cleaning agents and techniques to remove contaminants, carbon deposits, and oxidation from the OLTC or OCTC components. Ensure a pristine surface for optimal contact and operation.
Replacement and Refurbishment: Replace worn-out components with new, high-quality parts and refurbish elements such as contacts and resistors to restore optimal performance. Conduct specific tests, such as contact resistance tests, to validate the effectiveness of the replacements.
Reassembly and Testing: Methodically reassemble the OLTC or OCTC, adhering to manufacturer specifications and industry standards. Conduct a series of tests, including no-load and on-load testing, to verify the correct operation of the tap changer and ensure its compatibility with the transformer's operational requirements
