Busbar Current Measurement Using Integrated Shunt and Controlled Source
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Solution Overview
Problem
Existing methods for determining the magnitude of an electrical current flowing through a busbar are complex and expensive, especially when measuring across a wide frequency range or at high-voltage potential, often requiring additional components like current transformers or special alloys.
Innovation Solution
Utilizing a portion of the busbar as a current measurement shunt, in conjunction with a measurement conductor and a controlled current source, to determine the current magnitude without additional components, thereby simplifying the process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional current transformers or special alloy shunts are used for current measurement, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the measurement function from separate external components (current transformers, special alloy shunts) and integrates it directly into the existing busbar structure. By using the busbar itself as the measurement shunt and taking out only the necessary measurement points, the system achieves precise current measurement without adding complex external measurement devices.
Solution Approach 2:
The busbar serves dual functions: it acts as both the current conductor and the measurement shunt. The measurement conductor is electrically connected to the busbar at a first contact point and extends to a second contact point, while a third contact point on the busbar spaced apart from the first contact point allows the busbar segment between these points to function as the measurement element, eliminating the need for separate measurement components.
2Measurement precision
If additional current measurement shunt components are added, then current measurement capability is improved, but power loss increases
Solution Approach 1:
The patent merges the current conduction function and the measurement shunt function into a single integrated structure. The busbar segment between the first and third contact points serves both as the current carrier and as the measurement shunt, eliminating the need for additional separate shunt components that would introduce extra power losses.
3Reliability
If conventional measurement methods are used at high voltage potential, then measurement reliability is improved, but device complexity and cost increase
Solution Approach 1:
The measurement conductor acts as an intermediary element that allows voltage potential measurement without directly exposing external measurement devices to high voltage conditions. By connecting the measurement conductor to the busbar at strategically chosen points, the system can determine current at high voltage potential while keeping the measurement infrastructure relatively simple.
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 allows for reliable and efficient current measurement with minimal effort, avoiding additional power loss and eliminating the need for extra components, while maintaining accuracy across high frequencies and voltages.
Implementation Method 1
a voltage measurement device which is set up for measuring a voltage which occurs between the second contact point and the third contact point
Data Source
AI summary
An arrangement for determining a magnitude of an electrical current flowing through a busbar. The arrangement has a measurement conductor which is electrically connected at a first contact point to the busbar and which extends from the first contact point to a second contact point. A third contact point is located on the busbar at a spacing distance from the first contact point. A voltage measurement device is configured to measure a voltage between the second contact point and the third contact point. The arrangement also has a controlled current source which is configured to introduce a measurement current into the measurement conductor.