Condition maintenance of power transformer

The state maintenance of the transformer refers to the maintenance project and time based on the state of the transformer and the analysis and diagnosis results based on the state evaluation of the transformer (state monitoring, life prediction and reliability evaluation), and the maintenance that is actively implemented. The state maintenance of the transformer can enable the operation department to comprehensively and dynamically grasp the health status of the transformer in operation; prevent sudden accidents, avoid unexplained disassembly and overhaul; safe operation of the transformer, extend the life of the equipment, increase the availability, etc. Aspects have a significant role.

The steps for power transformer status maintenance are:

1. Information collection

Equipment status information mainly includes: equipment manufacturing, factory test data; equipment installation; equipment operation information (including normal, defects, operating conditions, trip times, fault information parameters, etc.); real-time data transmitted online monitoring; maintenance test Information (including pre-tests, defects and elimination of defects, infrared detection, etc.). The collected information is input into the power transmission and transformation equipment production management system for digital management.

2. State evaluation of the transformer

According to the "Guidelines for State Grid Corporation Transmission and Transformation Equipment Status Evaluation" and "State Grid Corporation Transmission and Transformation Equipment Condition Maintenance Test Regulations" and other technical standards, relying on the "transmission and transformation equipment status evaluation assistant decision system" to evaluate the state of the transformer At the same time, conduct risk assessment work.

3. Maintenance strategy formulation

On the basis of grasping the state of the transformer as a whole, the life estimation of the transformer is made, the accident risk rate of the transformer is predicted, and the balance between reliability and maintenance cost is sought, so that the corresponding maintenance strategy is formulated.