Insulation Variable Determination via Temporary Measuring System
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Solution Overview
Problem
Existing methods for determining insulation resistance in high-voltage networks, such as batteries, are complex and unable to measure partial insulation resistances efficiently, with long measurement times for large capacitances.
Innovation Solution
A method involving a measuring system temporarily connected to the network, measuring voltages before, during, and after connection, and using a processing unit to calculate insulation variables based on these measurements, allowing for reduced measurement duration and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a measuring system is permanently connected to the network for continuous insulation resistance measurement, then measurement reliability is improved, but device complexity and material expenditure increase
Solution Approach 1:
The measuring system transitions from a static permanent connection to a dynamic temporary connection. The system is connected to the network only during measurement phases and disconnected otherwise, reducing permanent component requirements while maintaining measurement reliability when needed.
Solution Approach 2:
The measuring system is extracted from the network during non-measurement periods. By temporarily connecting and disconnecting the measuring system, the patent eliminates the need for permanent measuring components to remain integrated in the network, reducing device complexity.
2Measurement precision
If a voltage divider is used to feed measuring voltage into the network for insulation resistance determination, then measurement capability is improved, but component complexity increases
Solution Approach 1:
The measuring system serves multiple functions: it provides the measuring voltage, measures the resulting current, and determines insulation resistance. By integrating these functions into a single temporary measuring system rather than separate permanent components, the patent reduces overall component complexity while maintaining measurement capability.
3Measurement precision
If measuring is performed during transient period with multiple time intervals, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent performs preliminary voltage measurement before connecting the measuring system to establish the initial state. This preliminary action allows the subsequent measurement during transient period to be more efficient, as the starting condition is already known, reducing the total measurement time required while maintaining accuracy.
4Measurement precision
If series connection of two capacitors is used to store voltage values for insulation resistance determination, then measurement capability is improved, but measuring time increases for large insulation capacitances
Solution Approach 1:
The patent introduces a temporary measuring capacitor as an intermediary element that works in conjunction with the capacitive structure being measured. This intermediary capacitor enables voltage storage and measurement without requiring the measuring system to wait for the complete charging/discharging cycles of large insulation capacitances, thereby reducing measuring time while maintaining measurement capability.
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
Enables efficient determination of insulation resistance with reduced material expenditure and measurement time, capable of distinguishing between parallel insulation resistances.
Implementation Method 1
The circuit may determine the insulation resistance by measuring an open-circuit voltage and a load voltage, wherein a series connection of two capacitors may be connected to the battery terminals for storing the voltage values during the measurement
Implementation Method 2
measuring a first voltage at the network when the measuring system is not connected to the network; connecting the measuring system to the network; measuring a second voltage at the network; disconnecting the measuring system from the network; measuring a third voltage at the network
Data Source
AI summary
A method and device for determining an insulation variable of a network. The method may comprise measuring a first voltage at the network, connecting the auxiliary system to the network, measuring a second voltage at the network, disconnecting the auxiliary system from the network, measuring a third voltage at the network, and determining the insulation variable based on the first voltage, the second voltage, and the third voltage.