The Jindongnan-Nanyang-Jingmen 1000 kV UHVAC pilot project is the first line in the World designed for commercial operation at this voltage level and will be the pilot project for the following development of a 1000kV network covering China future energy transmission corridor from North to South. The quality in design and manufacturing of the corresponding key equipment, with the 1000kV-1000MVA transformer above all, is the basic requirement to assure the required reliability in the operation of the pilot line as well as of the future developments.
What we have done
Quality Assurance services during the manufacturing process of 1000kV - 1000MVA three phase transformers and reactors, carried out it at manufacturer's factories of:
- XB - Xi'An (China) for reactors;
- TIANWEI – Baoding (China) for transformers;
- TBEA – Shenyang (china) for transformers;
- TBEA – Hengyang (China) for reactors.
The whole QA services dealt with:
- Design review (design of transformers and reactors reviewed by means of dedicated missions at manufacturer's premises by checking of all documents relevant to the design, as well as technical specifications and foreseen tests);
- Qualification of the manufacturers (analysis of the quality system of the companies, and in particular of the quality manual and related procedures, work instructions, quality control plans. The activity performed by means of a deep analysis of the documentation and meetings/interviews with the involved Company managers);
- Pre-inspection of production lines and of test laboratories (workshops and laboratories inspected with the aim at assessing Company's capabilities);
- In-production inspections (supervision of the whole manufacturing process of transformers and reactors monitored by means of phased inspections of key parts like, e.g. winding and core manufacturing, drying process, tank manufacturing, final assembling; stores and incoming materials also checked as well as sub-suppliers workshops);
- Witnessing to type and routine tests of transformers and reactors (type and routine tests of transformers and reactors: all type and routine tests witnessed by highly skilled inspectors).
The excellent supervision service provided by CESI allowed pinpointing several nonconformities during the design and manufacturing of the 1000kV-1000MVA transformers which could be smoothly and successfully solved also thank you to the advices which CESI