Transformer Gas Relay Calibration via Oil Flow Simulation
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Solution Overview
Problem
Traditional transformer protection systems using mineral insulation oil face challenges when transitioning to environment-friendly insulation liquids, as the changed oil flow velocity settings can lead to delayed protection actions and safety hazards due to differing properties of new insulation liquids.
Innovation Solution
A transformer simulation system that includes an oil tank, heating device, pump, and flow sensors to simulate oil flow conditions at fault temperatures, allowing for the measurement of oil flow velocity and determination of new setting values for gas relays, ensuring timely protection actions regardless of insulation oil type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If new environment-friendly insulation liquid is used instead of mineral insulation oil, then environmental protection and cleaning are improved, but the oil flow velocity changes causing delayed protection action
Solution Approach 1:
The patent changes the physical parameters of the insulation liquid from traditional mineral oil to new environment-friendly types (such as ester-based oils). This parameter change improves environmental compatibility while requiring corresponding adjustments to the gas relay setting values to maintain proper protection timing. The system adapts by recalibrating the flow velocity thresholds to match the viscosity and flow characteristics of the new insulation liquid.
2Device complexity
If gas relay setting value is referenced to previous mineral oil value, then device complexity is reduced, but protection action is delayed causing equipment damage
Solution Approach 1:
The patent replaces the traditional mechanical calibration method with a simulation-based measurement system. A test platform circulates the actual insulation liquid through a gas relay, using flow sensors and temperature control to replicate transformer operating conditions. This substitution allows precise determination of setting values based on actual fluid dynamics rather than relying on manufacturer defaults or theoretical calculations.
Solution Approach 2:
The system enables self-calibration of the gas relay by directly measuring the flow velocity characteristics of the specific insulation liquid being used. The test platform allows users to determine appropriate setting values through empirical measurement rather than requiring external expert intervention or complex calculation procedures, making the system self-sufficient for adaptation to different oil types.
3Use of energy by moving object
If traditional heating path outside oil tank is used, then heating efficiency is improved, but temperature uniformity and simulation accuracy deteriorate
Solution Approach 1:
The patent extracts the heating element from the external positioning and relocates it directly into the oil tank. This extraction allows the heating source to be immersed in the insulation liquid, ensuring uniform heat distribution throughout the fluid. The heating rod is positioned within the test oil volume to maintain consistent temperature across the entire circulation system, which is critical for accurate flow velocity measurement.
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
The system effectively simulates transformer fault conditions, measures oil flow velocity, and adjusts gas relay settings, preventing equipment damage and safety hazards by accounting for the properties of different insulation oils.
Implementation Method 1
a heating device, a heating temperature of which is set as the oil temperature at transformer fault
Implementation Method 2
Said pump body is connected to said first oil pipe or said second oil pipe... the pump body is activated, so that the oil in the oil tank is sequentially circulated
Implementation Method 3
Said first flow sensor is disposed in said first oil pipe... the oil flow velocity in the first oil pipe can be measured by the first flow sensor
Implementation Method 4
a pressure sensor for detecting oil pressure is disposed in said oil tank
Data Source
Figure 1~2
AI summary
A transformer simulation system and a measurement method for setting value simulation are disclosed. The transformer simulation system includes an oil tank, a heating device, a pump body, a first oil pipe, a second oil pipe and a first flow sensor. The heating device is disposed in the oil tank. The oil tank is provided with a first inlet and a first outlet, the first outlet is connected to the first oil pipe, and the first inlet is connected to the second oil pipe. An end of the first oil pipe away from the oil tank is a first mounting end for being connected to an oil inlet of a gas relay, and an end of the second oil pipe away from the oil tank is a second mounting end for being connected to an oil outlet of the gas relay. The pump body is connected to the first oil pipe or the second oil pipe, and the first flow sensor is disposed in the first oil pipe. The above-described transformer simulation system can measure the oil flow velocity, that is the setting value of the gas relay, and the type of the insulation oil in the oil tank can be replaced, then the corresponding setting value of the gas relay is obtained, so as to prevent the original gas relay from not playing the role of the protection due to a different property of the insulation oil.