Telescopic Disconnecting Device for Voltage Transformers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing disconnecting devices for voltage transformers in gas-insulated or metal-enclosed electrical substations are bulky, costly, and complex, with issues related to sealing, force requirements, and inability to pre-assemble before enclosure integration, leading to inefficiencies and safety concerns.
Innovation Solution
A compact disconnecting device using a telescopic guide system with fixed and movable electrical contacts, a control device accessible outside the enclosure, and a fixing device that allows pre-assembly and easy manual operation, reducing dimensions and ignition risks by using rigid elements and elastic mounting for secure contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transformer is made mobile in translation to enable disconnection, then the electrical isolation is achieved, but the space occupied is large
Solution Approach 1:
The disconnecting device is divided into separate components: a fixed connection element attached to the transformer and a movable connection element that can be independently actuated. This segmentation allows the transformer to remain fixed while achieving electrical isolation through the movable contact element, reducing the space required compared to moving the entire transformer.
Solution Approach 2:
The movable connection element is extracted as a separate actuable component from the transformer body. This extraction allows the disconnection function to be achieved by moving only the small contact element rather than the entire transformer, significantly reducing the volume of moving parts while maintaining electrical isolation capability.
2Reliability
If the transformer is driven in motion to enable disconnection, then the electrical isolation is achieved, but considerable force is required
Solution Approach 1:
The disconnecting device is segmented into a fixed connection element and a movable connection element. The movable element is designed to be actuated by a control rod that transmits force directly to the contact, requiring minimal force compared to moving the entire transformer. The mechanical advantage is achieved by moving only the small contact element rather than the heavy transformer body.
3Reliability
If a complex actuation mechanism with toothed wheel and crown is used, then the disconnection function is achieved, but the device becomes expensive and complex
Solution Approach 1:
The complex toothed wheel and crown actuation mechanism is replaced by a simplified direct actuation system. A control rod with a blocking piece is used to directly move the movable connection element, eliminating the need for intermediate gears and mechanical transmissions. This extraction of the oversimplified mechanism reduces both complexity and cost while maintaining the disconnection function.
Solution Approach 2:
Instead of using a complex mechanism to multiply force or motion, the invention inverts the approach by using a simple direct actuation system where the control rod directly moves the contact element. The complexity is inverted to simplicity, achieving the same function with fewer components and lower cost.
4Reliability
If flexible conductive tubes are used for high voltage applications, then the electrical connection is achieved, but the disconnecting device becomes bulky
Solution Approach 1:
The electrical connection is segmented into a fixed connection element on the transformer and a movable connection element. This segmentation eliminates the need for long flexible conductive tubes, as the connection is made through direct contact between rigid elements. The volume is reduced because the connection path is minimized and rigid elements are more compact than flexible tubes of equivalent length.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The device has a telescopic guiding device (10) for guiding a fixed electrical contact (121) and a mobile electrical contact (123). A fixation device fixes a self-supporting assembly formed by the fixed electrical contact, the mobile electrical contact, the guiding device and a control device i.e. control rod, to a voltage transformer (2). The fixed electrical contact constructed around an axis is mounted in an axially elastic manner for being elastically stopped against an electrical connection element (33) of the transformer, after the fixation of the assembly to the transformer. An independent claim is also included for a metallic envelope or gas insulated substation comprising a selection device.