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Transformer state integrated intelligent perception system
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The transformer state integrated intelligent perception system is designed to realize the real-time perception of the thermal field calculation, dynamic assessment of overload capacity and abnormal insulation state of the transformer, reduce the workload of transformer maintenance, reduce the maintenance cost, and provide guarantee for the reliable operation of the substation.
The transformer state comprehensive intelligent sensing system consists of transformer state comprehensive intelligent analysis device, sensor, indoor cabinet, outdoor cabinet and data management platform. The system applies edge computing, big data, Internet of Things and other technologies, adopts various monitoring modes, integrates transformer thermal field and key quantities reflecting insulation state, dynamically tracks, real-time diagnosis and grading alarm, and effectively improves the safe and economic operation level of transformers.
Indoor cabinet
Transformer state comprehensive intelligent analysis device
Sensors of each monitoring module
Outdoor cabinet
data management platform
■ Main functions
1) Monitoring of thermal field and load capacity of transformer
A. thermal field analysis and calculation: real-time calculation of transformer internal top oil temperature rise, oil average temperature rise, line oil temperature difference, winding average temperature rise, winding hot spot temperature rise, and early warning according to the corresponding information.
B. with load capacity assessment: real-time assessment of the transformer under the current operating conditions of the safe operation time, set the load (such as N-1 mode) under the maximum safe operation time, set the time (such as half an hour) under the maximum operating load, draw overload capacity curve.
c. Life loss assessment (optional): real-time assessment of transformer life loss based on real-time load, operating temperature and other information.
2) Insulation condition monitoring
A. partial discharge monitoring: draw transformer partial discharge phase distribution diagram (PRPD), pulse sequence phase distribution diagram (PRPS), identify the type of partial discharge.
B. Vibration and noise monitoring: analyze and extract the characteristic values of vibration signal and noise signal, and effectively identify and alarm abnormal vibration and noise based on multi-variable (energy ratio, complexity, harmonic ratio, etc.) online monitoring data.
C. core grounding current monitoring: draw the core grounding current waveform and historical waveform trend chart, set the alarm limit according to the alarm, and timely find the hidden dangers and faults of transformer shell grounding.
3) Comprehensive condition assessment
The system cooperates with a variety of state parameter analysis conclusions, and puts forward operation suggestions for the transformer to help the transformer operate economically and safely.
■ Main technical indicators
1) Applicable to oil-immersed transformers with voltage level of 110kV and above;
2) Evaluation time of each module and comprehensive status:<30s.
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