Dual Feeder Current Transformer Merging for Weight Reduction
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Solution Overview
Problem
Existing dual feeder systems require six current transformers to measure three-phase current, leading to increased size and weight, and there is a need for a more efficient solution to detect faults in these systems.
Innovation Solution
A dual feeder circuit system where current transformers are disposed around both wires, allowing current to flow in opposite directions, reducing the number of transformers needed and enabling fault detection through signal monitoring and computerized methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If six current transformers are used to measure three-phase current in dual feeder systems, then fault detection capability is achieved, but system size and weight increase
Solution Approach 1:
The patent combines multiple current measurement functions into a single current transformer by having multiple conductors pass through it. Specifically, the first conductor passes through in one direction while the second conductor passes through in the opposite direction, allowing one CT to measure current in both feeders simultaneously, thereby reducing the total number of CTs from six to one per phase
Solution Approach 2:
The single current transformer is designed to perform multiple functions: it measures current in both the first and second feeders, detects faults in either feeder, and provides directional information for fault location. This multi-functional design eliminates the need for separate CTs for each feeder
2Measurement precision
If six current transformers are used in dual feeder systems, then complete current measurement is achieved, but device complexity increases
Solution Approach 1:
Multiple current measurement functions are merged into a single current transformer device. The first conductor passes through the CT in one direction while the second conductor passes through in the opposite direction, allowing simultaneous measurement of both feeders with one CT instead of requiring separate CTs for each conductor
Solution Approach 2:
The second conductor is passed through the current transformer in the opposite direction compared to the first conductor. This inversion allows the CT to distinguish between current flow directions, enabling it to identify which feeder has a fault based on the direction of current flow through the transformer
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 configuration reduces the size and weight of current transformers, enhances fault detection accuracy, and eliminates nuisance trips by canceling normal current, resulting in a more reliable and efficient dual feeder system.
Implementation Method 1
one or more current transformers disposed on one or more of the feeders groups such that the current transformer is disposed around both the first wire and the second wire
Data Source
AI summary
A dual feeder circuit system for supplying electrical power can include one or more feeder groups, each feeder having a first wire and a second wire connected between a source terminal and a load terminal to carry the same electrical signal on both wires. The system can include one or more current transformers disposed on one or more of the feeders groups such that the current transformer is disposed around both the first wire and the second wire. The first wire can be passed directly through a first side of the current transformer to allow current to travel through the current transformer in a first direction, and the second wire can include a loop and be passed through a second side of the current transformer to allow current to travel through the current transformer in an second direction opposite the first direction.