On-load Tap Changer Motor Drive Actuation
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Solution Overview
Problem
Existing on-load tap changers require complex energy storage mechanisms for abrupt switching, which complicates their design and reduces operational reliability.
Innovation Solution
The on-load tap changer uses a common motor drive to actuate both the selector contact unit and switching means without an energy store, employing a gear module attached to the transformer cover for space-efficient and simplified design, with linear movement of the selector contact unit directly actuating the vacuum interrupters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a spring-loaded energy store is used for abrupt switching, then switching speed is improved, but device complexity increases
Solution Approach 1:
The patent removes the spring-loaded energy store from the system entirely. Instead of using mechanical energy storage for abrupt switching, the invention employs a motor-driven system with a threaded spindle and nut mechanism that converts rotational motion into linear motion, eliminating the need for complex energy storage components while maintaining switching capability.
Solution Approach 2:
The invention replaces the mechanical spring-loaded energy store with an electromechanical system. A motor drives a threaded spindle that converts rotational motion into linear motion of the selector contact unit, substituting the abrupt mechanical release of stored energy with a controlled electromechanical actuation process.
2Productivity
If a spring-loaded energy store is used for abrupt switching, then switching performance is improved, but operational reliability deteriorates
Solution Approach 1:
By removing the spring-loaded energy store, the patent eliminates the components that reduce reliability. The motor-driven system with threaded spindle provides a more reliable actuation mechanism that doesn't depend on the charging and discharge cycles of elastic energy storage, reducing wear and potential failure points.
3Ease of manufacture
If a complex energy store mechanism is used, then switching function is achieved, but space consumption increases
Solution Approach 1:
The patent merges the actuation mechanism for both selector contact units into a single motor-driven system. The motor drives a threaded spindle that simultaneously actuates multiple selector contact units through a common nut mechanism, consolidating what would otherwise require separate energy stores and actuation systems into one compact arrangement.
Solution Approach 2:
The motor-driven threaded spindle system serves multiple functions: it actuates both selector contact units, provides precise positioning, and eliminates the need for separate energy storage mechanisms. This multi-functional design reduces overall space consumption while maintaining full switching capability.
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 solution eliminates the need for complex energy storage, enhances operational reliability, and allows for uninterrupted switching between transformer taps, simplifying installation and reducing mechanical stress on the transformer cover.
Implementation Method 1
a motor drive (4), which interacts with the gear module (3)
Implementation Method 2
a gear module (3), which interacts with a motor drive (4)
Implementation Method 3
a rotary movement generated by a motor drive (4) is transmitted by means of a gear module (3) to a threaded spindle (15), which is in engagement with a spindle nut (16)
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The invention relates to an on-load tap changer for switching among different winding taps of a step transformer without interruption according to the preamble of the first patent claim. The general inventive concept lies in actuating both the selector contact unit and the switching means for uninterrupted load switching by means of a common motor drive without an energy store being connected therebetween.