External Hanging Vacuum Tap Switch for Transformers
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Solution Overview
Problem
Existing on-load tap switches require significant space within transformers, complicate maintenance, and are not suitable for high voltages and large currents due to structural limitations, leading to increased volume, maintenance difficulties, and potential oil contamination.
Innovation Solution
An external hanging combined vacuum on-load tap switch with a parallel arrangement of the tap selector and switching means, utilizing a Geneva/grooved wheel mechanism and straight-line quick moving mechanism for operation, allowing adaptation to Δ connection mode and reducing the transformer's volume by housing the switch externally, thus simplifying maintenance and preventing oil contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the combined on-load tap switch is placed inside the transformer oil tank, then the switching function is integrated, but the transformer volume increases and maintenance becomes complicated
Solution Approach 1:
The patent extracts the combined on-load tap switch from the transformer oil tank and places it externally. The switch is mounted on the transformer tank wall through a flange connection, with the operating mechanism positioned outside the oil tank. This extraction resolves the contradiction by maintaining the switching function while reducing the transformer's internal volume requirements and simplifying maintenance operations.
2Adaptability or versatility
If the combined on-load tap switch is placed inside the transformer oil tank, then the switching function is integrated, but maintenance requires full discharge of oil and suspension covering
Solution Approach 1:
The switch is extracted from the oil tank environment and mounted externally with its operating mechanism accessible from outside. This allows maintenance personnel to service the switch without draining the transformer oil or implementing suspension covering, significantly reducing maintenance complexity while preserving the integrated switching capability.
3Adaptability or versatility
If the combined on-load tap switch is placed inside the transformer oil tank, then the switching function is integrated, but oil leakage or damage pollutes the transformer
Solution Approach 1:
The switch is extracted from the oil tank and mounted externally, physically separating it from the transformer oil. This eliminates the risk of oil contamination from switch leakage or damage, as the switch operates in a separate external environment while maintaining its integrated switching function through flange connections.
4Device complexity
If the combined on-load tap switch uses a single-post structure with Y-type connection, then the switching operation is simplified, but three switches are needed for Δ connection transformers
Solution Approach 1:
The patent designs the combined on-load tap switch with multi-functional capability to accommodate both Y-type and Δ connection modes. The switch structure includes configurable contact arrangements and tapping positions that can be adapted to different connection types, allowing a single switch to replace what would traditionally require three separate switches for Δ connection transformers, thereby reducing device complexity while maintaining versatility.
5Productivity
If the combined on-load tap switch combines all switching components in a movable contactor assembly, then the operation is synchronized, but the structure is limited to low voltages and small currents
Solution Approach 1:
The patent segments the switching components and distributes them across fixed and movable contactors rather than concentrating them in a single movable assembly. The fixed contactors are mounted on the transformer tank while the movable contactor operates externally. This segmentation allows each component to be optimized for its specific electrical parameters, enabling the system to handle high voltages and large currents while maintaining synchronized operation through the mechanical connection of the moving contactor to the operating mechanism.
Data Source
AI summary
The invention relates to an external hanging combined vacuum on-load tap switch, comprising a case, a tap selector, a switching means assembly, a transmission device, and one electric operation mechanism, wherein one lateral side wall of the case is provided with a connecting terminal connected with the coil tap of a transformer; the external side of the wall is provided with a first flange plate and is connected with a second flange plate of the transformer; the tap selector and the switching means assembly are arranged inside the case in parallel; and the electric operation mechanism is connected with the transmission device and drives the tap selector and the switching means assembly to achieve tapping and switching through the transmission device.