Transformer Simulation Weather Compensation
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Solution Overview
Problem
Existing methods for determining the operating state of power transformers fail to adequately consider weather influences such as wind and rain, which significantly affect the thermal behavior and aging of transformer components, necessitating additional sensors and complicating the thermo-hydraulic simulation models.
Innovation Solution
A control system is introduced upstream of the thermo-hydraulic simulation model to account for weather influences by calculating control deviations from measured insulating fluid temperatures, using difference generators and controllers to adjust manipulated variables, thereby integrating weather effects without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct measurements of insulating fluid temperature are used in thermo-hydraulic transformer aging models, then measurement precision is improved, but device complexity increases due to the need for additional sensors and complex weather parameter integration
Solution Approach 1:
The patent introduces an intermediary control system that acts as a mediator between weather conditions and the thermo-hydraulic simulation model. This control system processes weather data (wind, rain, ambient temperature) and generates adjusted temperature values that reflect weather influences without requiring direct installation of multiple temperature sensors on the transformer. The intermediary translates complex weather parameters into effective temperature corrections that are fed into the existing simulation model.
Solution Approach 2:
The patent creates a simplified representation (copy) of the complex weather-influenced thermal behavior through control variables. Instead of directly modeling all weather parameters and their complex interactions with the transformer, the system generates control variables that replicate the net effect of weather influences on temperature. This copying approach allows the existing thermo-hydraulic model to be enhanced with weather effects without requiring complete remodelling or additional physical sensors.
2Reliability
If additional sensors are installed to measure weather influences, then reliability of weather parameter consideration is improved, but device complexity and cost increase
Solution Approach 1:
The control system designed in the patent serves multiple functions: it processes various weather parameters (wind, rain, ambient temperature), generates temperature corrections, and interfaces with the existing thermo-hydraulic simulation model. This multi-functional approach means that a single control system module can handle all weather-related considerations without requiring separate measurement and processing systems for each parameter, thereby maintaining reliability while avoiding additional sensor installations.
Solution Approach 2:
The system utilizes existing temperature measurements from the transformer's insulating fluid temperature sensors and combines them with weather data processing within the control system. The control system essentially serves itself by using available data (existing temperature sensors plus weather information) to generate the necessary corrections, rather than requiring entirely new sensor installations for weather parameters.
3Adaptability or versatility
If complex weather parameters are directly integrated into the simulation model, then adaptability to weather influences is improved, but manufacturing precision and model simplicity are compromised
Solution Approach 1:
The patent segments the complex weather-influence problem into two distinct parts: (1) weather parameter measurement and processing, handled by the control system; and (2) thermal-physical relationships, handled by the existing thermo-hydraulic simulation model. The control system generates control variables that represent the net effect of weather influences, which are then fed as inputs to the simulation model. This segmentation allows the physical relationships within the simulation model to remain simple and accurate while still achieving adaptability to weather influences through the control layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach accurately reflects weather-induced temperature changes in the transformer, maintaining physical relationships within the simulation model, enhancing its predictive accuracy without requiring extra weather sensors.
Implementation Method 1
measured values are obtained from sensors arranged in or on the respective power transformer, wherein a liquid temperature measured value is derived from the measured values, which corresponds to a measured temperature of the insulating liquid
Implementation Method 2
a thermo-hydraulic simulation model determines the operating state of the power transformer by providing state parameters on the output side of the thermo-hydraulic simulation model, which together represent the operating state of the power transformer
Implementation Method 3
a cooling unit for cooling the insulating liquid
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method (1) for determining the operating state of a transformer (9) located in a high-voltage network, said transformer comprising: a tank (11) filled with insulating liquid; an active part that is located in the tank (11) and has windings that enclose a core and sections of the core; and a cooling unit for cooling the insulating liquid. In the method according to the invention: - measurement values are obtained from sensors which are located in or on the power transformer, wherein said measurement values are used to obtain at least one liquid temperature measurement value (ΔΘao,meas, Do,meas) which corresponds to a measurement temperature of the insulating liquid or is calculated from a plurality of temperature values (Tamb), and wherein at least one temperature value corresponds to a measurement temperature of the insulating liquid (Θtop, Θbot); - the measurement values and/or values derived therefrom are supplied to a thermohydraulic simulation model (4); - the thermohydraulic simulation model (4) then determines the operating state of the transformer (9) by providing, on the output side, simulated state parameters which together represent the operating state of the transformer, wherein at least one state parameter is an insulating liquid temperature state parameter which corresponds to a temperature value simulated for the insulating liquid. In such a method, it ought to become possible to take weather influences such as wind or rain into account. Therefore, according to the invention at least one controlled system (3, 4) is connected upstream of the thermohydraulic simulation model (4) on the input side, which controlled system determines a control deviation (eAO, eO) which is formed from the difference between the liquid temperature measurement value (ΔΘa o ,meas, Do,meas) and the corresponding simulated insulating liquid temperature state parameter (ΔΘao, Do).