Series Injection Transformer on Power Tower
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Solution Overview
Problem
Current high voltage power distribution systems face challenges in efficiently controlling active power flow due to congested networks, leading to unbalanced line currents and increased losses, with existing distributed impedance injection systems being costly and unreliable.
Innovation Solution
An active impedance injection module with a multi-turn primary winding transformer is suspended from a tension-bearing tower, enabling higher voltage and current injection capabilities while reducing the number of modules needed, and using a non-gapped transformer core with ribbon conductors to minimize weight and heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a single-turn primary winding transformer is used for distributed impedance injection, then the device weight is reduced and installation is simplified, but the voltage injection capability is limited
Solution Approach 1:
The primary winding is divided into multiple turns instead of a single turn, allowing the transformer to achieve higher voltage injection capability through increased winding turns while maintaining a distributed installation approach on the transmission line
Solution Approach 2:
The transformer is mounted on the transmission line structure (tower or pole) rather than being clamped directly to the conductor, transitioning from a conductor-mounted configuration to a structure-mounted configuration that provides additional space and support for higher power capability
2Reliability
If more distributed impedance injection modules are deployed to improve power flow control, then the coverage and control capability are enhanced, but the system cost and complexity increase
Solution Approach 1:
The transformer design with multi-turn primary winding provides enhanced voltage injection capability in a single unit, allowing one module to perform the work of multiple single-turn modules, thereby reducing the total number of devices needed while maintaining or improving control capability
3Weight of moving object
If ribbon conductors are used in the transformer windings, then the weight and heating are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
Ribbon conductors with flat cross-section are used instead of round conductors, providing better packing density in the winding and reduced skin effect, which decreases weight and heating while the precision requirements are managed through controlled winding techniques
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 solution enhances the influence on power flow, improves system reliability, and reduces costs by allowing for dynamic and static control of power transfer, increasing the efficiency and stability of the power grid.
Implementation Method 1
a transformer having a multi-turn primary winding, the voltage converter generating voltages at the appropriate phase angle to be impressed on a secondary winding of the series injection transformer
Data Source
Figure 1
Figure 2
Figure 2A~2B
AI summary
The power transmission tower mounted series injection transformer (TMIT) injects impedance and/or voltage on a transmission tower power line. A tension bearing tower uses vertical and horizontal insulators to support and stabilize the ΤΜΓΤ. The TMIT can be much heavier than a transformer device clamped to the high-voltage transmission line. The TMIT is connected in series with the tension bearing tower's jumper allowing it to use a multi-turn transformer. By operating at the line voltage potential, the TMIT does not require the large bushings and oil drums used by sub-station injection transformers.