High Voltage Insulation Measurement Using Dynamic Frequency Correction
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Solution Overview
Problem
Existing methods for measuring the characteristics of high voltage device insulation systems are complex and require adjustments for varying capacitance and frequency, leading to difficulties in evaluating the state of the insulation system accurately.
Innovation Solution
A method involving disconnecting the high voltage device from the network, connecting a measuring equipment, and using an inductor to create a test system. The method determines reference and measuring frequencies, measures capacitance and loss at these frequencies, and applies correction factors to obtain accurate results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a variable inductor is used to adjust the resonance frequency for different capacitances, then the resonance frequency can be accurately set, but the system becomes heavy and complex
Solution Approach 1:
The patent applies the Dynamics principle by making the measuring frequency adjustable rather than fixed. The measuring frequency is dynamically adapted based on the capacitance of the test object, allowing the system to achieve resonance without requiring a variable inductor. This resolves the contradiction by enabling frequency accuracy through software/control adjustments rather than physical component changes.
Solution Approach 2:
The patent changes the operating frequency parameter dynamically based on the measured capacitance. By calculating the appropriate measuring frequency from the capacitance value and applying it to the measurement, the system achieves accurate resonance conditions without physical adjustment mechanisms, thereby maintaining simplicity while ensuring measurement precision.
2Device complexity
If fixed inductors are used to simplify the system, then the system becomes lighter and less expensive, but measurements of similar test objects are performed at slightly different frequencies
Solution Approach 1:
The patent dynamically adjusts the measuring frequency parameter based on the capacitance of each test object. This allows the use of fixed inductors while maintaining measurement consistency by compensating for capacitance variations through frequency adaptation, ensuring that all measurements are normalized to equivalent conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the capacitance measurement is used to determine the appropriate measuring frequency. This closed-loop approach ensures that the measuring frequency is optimally selected based on the actual test object characteristics, maintaining measurement consistency across different test objects while using simple fixed inductors.
3Ease of operation
If measurements are performed without frequency correction, then the measurement process is simpler, but the results are affected by frequency variations
Solution Approach 1:
The patent applies parameter changes by introducing frequency correction factors that adjust the measured capacitance and loss values based on the actual measuring frequency and reference frequency. This correction is automatically calculated and applied, maintaining measurement accuracy without adding significant operational complexity to the measurement process.
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 method simplifies the measurement process, reduces the complexity of evaluating insulation system characteristics, and provides accurate results by applying correction factors for temperature and frequency effects.
Implementation Method 1
a resonance system is commonly used wherein an inductor is connected in parallel and/or in series to the electrical insulation system to create a resonance circuit. By means of this resonance circuit, the current and/or voltage needed for the measuring operation is considerably lowered
Data Source
AI summary
A method of measuring a characteristic of an electrical insulation system of a high voltage device connectable to an electrical network, the method comprising the following steps: disconnecting the high voltage device from the electrical network and connecting a measuring equipment to the electrical insulation system, thereby providing a test system, connecting an inductor to the test system, determining a reference frequency, determining a measuring frequency of the measuring operation, measuring at least one of capacitance and loss at the measuring frequency and at the reference frequency, providing at least one correction factor according to formulas, and applying the at least one correction factor on measurement results at the measuring frequency to obtain corrected measurements results corresponding to the reference frequency. A device using the method is also provided.