In-situ Wye Ring Replacement for Wind Turbine Generator Repair
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Solution Overview
Problem
The existing methods for repairing a cracked Wye ring in wind turbine generators require replacing the entire generator, which is costly, time-consuming, and involves shutting down the turbine, as they lack in-situ repair solutions, leading to significant downtime and expenses.
Innovation Solution
A method for repairing a wind turbine generator's rotor by dismantling the non-drive end, removing insulation and old Wye ring portions, installing a replacement Wye ring, connecting it to existing lugs, and insulating it, all performed in-situ, along with temporary rebalancing measures to address potential rotor imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire generator is replaced to repair a cracked Wye ring, then the generator reliability is restored, but the repair cost and downtime increase significantly
Solution Approach 1:
The repair process is segmented into discrete steps: removing only the defective Wye ring component, installing a replacement Wye ring, and reassembling the generator. This selective replacement of only the faulty component rather than the entire generator dramatically reduces downtime while restoring reliability.
Solution Approach 2:
The defective Wye ring is extracted and removed from the generator, allowing replacement of only this specific component. This extraction approach eliminates the need to replace the entire generator, reducing both time and cost while restoring the generator's reliability.
2Reliability
If the entire generator is replaced to repair a cracked Wye ring, then the generator reliability is restored, but the repair cost increases significantly
Solution Approach 1:
The repair is segmented to replace only the Wye ring component rather than the entire generator assembly. This segmentation of the repair scope directly reduces material costs and labor expenses while still achieving the goal of restoring generator reliability.
Solution Approach 2:
Instead of replacing the expensive entire generator, a relatively inexpensive Wye ring component is replaced. This approach uses a lower-cost replacement part to achieve the same reliability outcome, significantly reducing repair costs.
3Ease of repair
If the generator is disassembled for Wye ring replacement, then the repair accessibility improves, but the repair complexity increases
Solution Approach 1:
The generator disassembly is segmented into specific steps required only to access the Wye ring, rather than complete disassembly. This selective segmentation provides necessary accessibility while limiting the increase in repair complexity to only the essential steps.
Solution Approach 2:
The repair process uses intermediate steps and temporary configurations to access the Wye ring without requiring complete generator disassembly. This intermediary approach maintains repair accessibility while managing complexity through controlled, incremental disassembly and reassembly.
Data Source
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AI summary
A method 1400 for servicing a rotor of a generator includes the steps of, dismantling 1410 a non-drive end of the generator, removing 1420 insulation from portions of an existing Wye ring and existing connection lugs, removing 1430 portions of the existing Wye ring near the existing connection lugs, installing 1440 a replacement Wye ring in the generator, connecting 1450 the replacement Wye ring to the existing connection lugs, and insulating 1460 the replacement Wye ring and the existing connection lugs. The method 1400 is performed on the generator in-situ.