Rogowski Sensor Temperature Gradient Compensation
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Solution Overview
Problem
Rogowski sensors in Gas Insulated Switchgears (GIS) face precision issues due to temperature gradients, which affect current measurements, leading to variations in coil thickness and induced currents.
Innovation Solution
Incorporating multiple digital or analog temperature sensors around the Rogowski coil to measure and compensate for temperature gradients, allowing for accurate temperature compensation and improved current measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are distributed around the Rogowski coil to measure temperature gradients, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The temperature measurement function is segmented into multiple distributed temperature sensors positioned at different locations around the Rogowski coil. This allows independent measurement of temperature at each location, enabling accurate detection of temperature gradients without requiring a single complex sensing system.
Solution Approach 2:
The solution transitions from single-point temperature measurement to distributed spatial temperature measurement by positioning sensors around the coil's circumference. This adds a spatial dimension to temperature monitoring, allowing gradient detection and compensation across different zones of the sensor.
2Reliability
If multiple temperature sensors are used to compensate for temperature gradients, then reliability of current measurement is improved, but manufacturing complexity increases
Solution Approach 1:
The temperature compensation function is divided into multiple independent temperature sensor units distributed around the coil. Each sensor independently measures local temperature, and their combined data enables comprehensive gradient compensation, improving reliability without requiring a single complex sensing mechanism.
Solution Approach 2:
The system compensates for temperature effects by monitoring and utilizing temperature parameter variations at multiple locations. By measuring actual temperature gradients and applying corrections based on these measured parameters, the system maintains measurement reliability under varying thermal conditions.
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 solution achieves an accuracy class of 0.1 in current measurement even with significant temperature gradients, ensuring precise energy metering by accounting for temperature variations and geometrical parameters, thus enhancing the reliability of current measurements in GIS environments.
Implementation Method 1
the current induced in the lower part of the coil is different from the current induced in the upper part because of the different thermal expansions
Data Source
AI summary
The application relates to a Rogowski sensor including a coil on a board, for a conductor of a GIS, the sensor including at least four analog temperature sensors, including two groups of two of the sensors connected in series, the two groups being connected in parallel.