On-Load Tap Changer Head Detector Device
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Solution Overview
Problem
Existing on-load tap-changer systems face challenges in cost-effective protection against faults that cause pressure increases due to reduced insulating oil effectiveness, leading to potential oil decomposition and gas formation, which existing flow relays struggle to address efficiently.
Innovation Solution
An on-load tap changer head with a detector device featuring a flow flap and magnetic clutch system, allowing for the detection of increased fluid flow rates and actuation of switches without being under oil, reducing costs and enhancing durability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switches are placed in the first area under insulating oil for fault detection, then fault detection capability is improved, but device complexity and cost increase due to expensive oil-resistant components
Solution Approach 1:
The detector device is segmented into two distinct areas: a first area exposed to insulating oil for flow detection, and a second area isolated from oil for housing switches and electronics. This segmentation allows each component to be optimally designed for its specific environment, reducing overall device complexity while maintaining fault detection capability.
Solution Approach 2:
The switches and electronic components are extracted from the oil-exposed environment and placed in a separate second area. This extraction eliminates the need for expensive oil-resistant components while preserving the fault detection function through magnetic coupling across the boundary wall.
2Reliability
If switches are placed in the first area under insulating oil, then fault detection is enabled, but manufacturing cost increases due to expensive oil-resistant switches
Solution Approach 1:
The expensive oil-resistant switches are extracted from the first area and replaced with standard, cost-effective switches located in the second area. The extraction is enabled by magnetic coupling through the wall, which transmits the flow detection signal without requiring direct contact between the switch and insulating oil.
Solution Approach 2:
A magnetic field acts as an intermediary to transmit the flow detection signal from the first area to the switches in the second area. This intermediary mechanism allows standard switches to be used instead of expensive oil-resistant switches, significantly reducing manufacturing costs while maintaining fault detection capability.
3Device complexity
If flow detection components are isolated from insulating oil, then manufacturing cost and complexity are reduced, but transmission of movement signals becomes more challenging
Solution Approach 1:
A magnetic field serves as an intermediary to transmit movement signals from the flow flap in the first area to the switches in the second area. The magnetic coupling through the wall enables reliable signal transmission without requiring physical penetration of the oil barrier, solving the signal transmission challenge while maintaining component isolation.
Solution Approach 2:
The mechanical signal transmission system is replaced with a magnetic field-based system. Instead of using mechanical linkages that would require penetrating the wall barrier, the invention uses magnetic coupling to transmit the flow detection signal, simplifying the overall system while enabling effective signal transmission across the isolated boundary.
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 design simplifies construction, reduces costs by eliminating expensive oil-resistant components, and ensures reliable detection and signaling of faults, enhancing the overall protection and efficiency of the on-load tap-changer system.
Implementation Method 1
The transmission of the movements by means of the magnetic couplings is particularly durable and reliable
Implementation Method 2
a flow flap which is arranged in the first area and folds from a first position into a second position above a specified flow rate of the insulating fluid
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
An on-load tap changer head (20) for an on-load tap changer (10) comprises a first region (21) which is formed in the on-load tap changer head (20) and through which an insulating fluid (17) of the on-load tap changer (10) can flow; a second region (23) which is separated from the first region (21) by a wall (22); a detector apparatus (39) for detecting an elevated flow rate of the insulating fluid (17), comprising a flow control flap (24) which is arranged in the first region (21) and switches from a first position (24A) to a second position (24B) starting from a defined flow rate of the insulating fluid (17); a first coupling magnet (25) which is fastened to the flap (24) and is located in the immediate vicinity of the wall (22) in the second position (24B) of the flow control flap (24); a second coupling magnet (26) which is arranged in the immediate vicinity of the wall (22) in the second region (23); a switch (27) which is arranged in the second region (23) and is coupled to the second coupling magnet (26) in such a way that the process of switching over the flow control flap (24) from the first position (24A) to the second position (24B) operates the switch (27).