Three-Conductor Line Spacer With Rotating Clamps Against Galloping
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Solution Overview
Problem
Conventional overhead transmission line spacers are ineffective in suppressing galloping caused by strong winds in three-conductor transmission lines, as they typically use fixed clamps that lead to uniform snow and ice accretion, failing to prevent deformation or breakage of steel towers and phase-to-phase short circuits.
Innovation Solution
An overhead transmission line spacer with two movable clamps and one fixed clamp, allowing the transmission lines to have different cross-sectional shapes of snow and ice accretion, thereby preventing uniform lift and reducing galloping. The movable clamps rotate within a range of −90° to 90°, and the fixed clamp is positioned upward to enhance vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all three clamps are used as fixed clamps, then the structure is simple and easy to manufacture, but uniform snow and ice accretion occurs on the three overhead transmission lines, causing galloping
Solution Approach 1:
The patent applies the dynamics principle by converting two of the three clamps from fixed to movable types. The movable clamps can rotate about the overhead transmission lines, allowing the cross-sectional shape of snow and ice accretion to vary dynamically. This dynamic capability prevents uniform snow and ice accretion patterns that cause galloping, while maintaining manufacturing simplicity through the use of standard clamp designs.
Solution Approach 2:
The patent applies parameter changes by altering the rotational state parameter of the clamps. Two clamps are designed with rotational freedom, enabling them to change their orientation relative to the transmission lines. This parameter change (from fixed orientation to variable orientation) disrupts uniform snow and ice accretion, effectively suppressing galloping while keeping the overall structure simple.
2Object-affected harmful factors
If movable clamps are used to prevent uniform snow and ice accretion, then galloping is suppressed, but the device complexity increases
Solution Approach 1:
The patent applies local quality by implementing movable clamps with rotational capability only at specific locations (two out of three positions) rather than making all clamps movable. This localized application of complexity achieves effective galloping suppression by creating sufficient variation in snow and ice accretion patterns, while avoiding the unnecessary complexity of making all three clamps movable.
Solution Approach 2:
The patent applies partial action by using only two movable clamps instead of all three. This partial implementation is sufficient to break the uniformity of snow and ice accretion and suppress galloping, while minimizing the increase in device complexity. The third clamp remains fixed, providing structural stability without the need for rotational capability.
Data Source
AI summary
The present disclosure is related to providing an overhead transmission line spacer which can suppress galloping caused by strong wind in the three-conductor transmission line formed of three overhead transmission lines. An overhead transmission line spacer comprising: three clamps configured to individually hold three overhead transmission lines; and a frame body including support members and a frame portion, and configured to maintain separations between the three overhead transmission lines via the three clamps, the clamps being attached to the support members, and the frame portion maintaining separations between the support members, wherein two out of the three clamps are movable clamps, each of which is configured to hold one of the overhead transmission lines in a rotatable manner about the one of the overhead transmission lines, and one out of the three clamps is a fixed clamp configured to hold one of the overhead transmission lines without allowing rotation.