On-Load Tap Changer Drive Profiles for Flexible Safe Switching
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Solution Overview
Problem
Existing on-load tap changer drive systems are rigid and inflexible, making complex adjustments necessary for simple operations, and lack safety during switching operations.
Innovation Solution
A drive system for on-load tap changers that includes a motor connected to a drive shaft, a control device communicatively linked to a sensor system, which selects and executes driving profiles based on the direction and position of tap switches to ensure flexible and safe operations, considering mechanical conditions and freewheeling features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a motor is rigidly connected to on-load tap-changers via linkages with hard wiring, then the drive structure is simple and robust, but the drive becomes rigid and inflexible requiring complex modifications for adjustments
Solution Approach 1:
The patent applies dynamics by replacing rigid hard-wired connections with a flexible cable carrier system that allows the drive to adapt its configuration dynamically. The cable carrier enables the motor to be repositioned and reconnected to different tap-changer units without complex modifications, transforming a static rigid structure into a dynamically adaptable system.
2Reliability
If the motor is actuated via hard wiring through motor contactors, then the switching operation is reliable, but the drive system lacks flexibility for different operating scenarios
Solution Approach 1:
The cable carrier system enables dynamic reconfiguration of the drive system, allowing the motor to serve multiple tap-changer units in different configurations. This maintains reliable switching through proven motor-contactor technology while adding operational flexibility through easy repositioning and reconnection capabilities.
3Ease of manufacture
If the drive system uses fixed wiring and rigid connections, then assembly is straightforward, but any adjustments require complex modifications
Solution Approach 1:
The cable carrier replaces fixed rigid wiring with a flexible, easily reconfigurable connection system. Assembly remains straightforward as the cable carrier is a complete modular unit, while adjustments become simple matters of repositioning and reconnecting the cable carrier rather than complex wire modifications.
Solution Approach 2:
The drive system is segmented into modular components with the cable carrier as a distinct replaceable unit. This segmentation allows the cable carrier to be independently installed, removed, and reconfigured without affecting the motor or tap-changer units, simplifying both assembly and maintenance operations.
4Stability of the object's composition
If the motor is mounted rigidly on the transformer housing, then the drive system is stable, but it cannot accommodate different mounting positions or configurations
Solution Approach 1:
The cable carrier provides a flexible connection that decouples the motor mounting position from the tap-changer units. The motor can be mounted stably at any convenient location on the transformer housing while the flexible cable carrier accommodates position changes and enables connection to different tap-changer units.
Data Source
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AI summary
The invention relates to a method for carrying out a switchover of an on-load tap changer (8) using a drive system (3). The drive system (3) comprises at least one motor (12) which acts on a driveshaft (16), a controller (2), and a transmitter system (13) which is coupled directly or indirectly to the driveshaft (16). Specific travel profiles (22) can be selected via a controller (2) such that the drive system (3) of the on-load tap changer (8) carries out a switchover from one tap (NJ) to the next tap (NJ+1) or (NJ-1) using the travel profile (22) or the travel profiles (22).