Full-Range Accumulator Boosting for Reliable Tap Changer Switching
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Solution Overview
Problem
Existing on-load tap changers face issues with incomplete switching under unfavorable conditions, such as insufficient elasticity, high viscosity of oil, or low temperatures, leading to unreliable operation and potential damage to transformers.
Innovation Solution
A full range boosting device for an accumulator of an on-load tap changer, comprising a first and second sheave intermittent mechanism, a central gear, epicyclic gear train, mechanical energy storage device, and limiting device, which ensures the driven shaft can rotate to a predetermined terminal angular position even under challenging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sheave intermittent mechanism is used for boosting, then the structure is simpler, but the boosting range is limited and cannot cover the entire motion process of the driven shaft
Solution Approach 1:
The boosting device is segmented into a first sheave intermittent mechanism and a second sheave intermittent mechanism, each responsible for different angular ranges of the driven shaft. The first mechanism covers a boosting angle range, while the second mechanism covers the remaining range, ensuring full-range boosting coverage without requiring a single complex mechanism.
2Ease of operation
If the sheave intermittent mechanisms are not precisely positioned, then the installation is easier, but the driven shaft cannot reach the predetermined terminal angular position accurately
Solution Approach 1:
The first sheave intermittent mechanism and the second sheave intermittent mechanism are pre-positioned at specific angular locations on the driven shaft during assembly. The first mechanism is positioned to cover the initial boosting range, and the second mechanism is positioned to cover the remaining range, ensuring that their combined action precisely achieves the predetermined terminal angular position without requiring complex adjustments during operation.
3Device complexity
If only mechanical energy storage device is used without auxiliary boosting, then the device is simpler, but the driven wheel cannot reliably rotate to the predetermined terminal angular position under unfavorable conditions
Solution Approach 1:
The sheave intermittent mechanisms are designed to provide auxiliary boosting force in advance during the motion process of the driven shaft. By activating these mechanisms at specific angular positions, the system compensates for potential energy deficiencies before they can cause switching failure, ensuring reliable operation even under unfavorable conditions such as low temperature or mechanical energy storage device failures.
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
The solution provides reliable and complete switching by assisting the driven shaft at any position during its motion process, enhancing reliability and reducing mechanical contact wear, thus ensuring the on-load tap changer operates reliably under various conditions.
Implementation Method 1
a radial slot is formed in the driven sheave... its boosting plate on the driven sheave rotates an angle to be boosted by a cooperation of the dial round pin and the radial slot in the driven sheave
Implementation Method 2
The flywheel is connected to the driven shaft without relative rotation. The drive transmission mechanism with the variable instantaneous transmission ratio is configured to convert a rotation of the drive shaft in any direction into a unidirectional rotational drive of the epicyclic gear train
Implementation Method 3
The mechanical energy storage device is configured to perform a mechanical energy storage during a rotation of the epicyclic gear train and a stationary process of a driven wheel, and supply power for the epicyclic gear train to continue to rotate after the energy storage is in place
Data Source
AI summary
A full range boosting device includes two sheave intermittent mechanisms installed alternately in an up-down direction and a central gear. The two sheave intermittent mechanisms each include a dial gear, a driving dial fixed coaxially with the dial gear with no contact in axial direction, a dial round pin, a driven sheave having a radial slot, and a boosting plate fixedly connected to the driven sheave. Two dial gears are driven by the same central gear. When the driving dial of one of the sheave intermittent mechanisms rotates an angle of α1, its boosting plate rotates an angle to be boosted by a cooperation of the dial round pin and the radial slot. When the driving dial of the other sheave intermittent mechanism rotates an angle of (360°−α1), its dial round pin is exactly located at a notch of the radial slot.