Servo Motor Tap Changer Feedback Control
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Solution Overview
Problem
Existing on-load tap changers for transformers lack precise control and efficient mechanisms for making tap changes while the transformer is connected to the voltage source, leading to potential issues with voltage regulation and safety during the tap change process.
Innovation Solution
The implementation of a servo motor-driven tap changer system that includes a servo motor with a feedback device and servo drive, which controls the tap change module comprising a bypass switch assembly, vacuum interrupter assembly, and selector switch assembly, allowing for precise angular displacement control and safe tap changes without arcing or circulating current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional drive system is used for tap changer operations, then the structure is simpler, but the control precision and positioning accuracy are insufficient
Solution Approach 1:
The patent implements a feedback control system using encoders to detect the angular position of the motor shaft and provide real-time position information to the control circuit. The control circuit compares the actual position with the target position and adjusts the motor drive signals accordingly, achieving precise positioning control while managing system complexity through intelligent control algorithms.
Solution Approach 2:
The patent replaces conventional mechanical positioning mechanisms with an electronically controlled servo system. Instead of using complex mechanical linkages and manual adjustment mechanisms, the system uses a servo motor with electronic feedback control to achieve precise angular displacement control, reducing mechanical complexity while improving positioning accuracy.
2Reliability
If tap changes are made without precise control, then the operation is simpler, but arcing and circulating currents occur causing safety issues
Solution Approach 1:
The patent implements preliminary action by using the control circuit to pre-coordinate the operation sequence of the bypass switch assembly and selector switch assembly. Before actual tap switching occurs, the control system prepares the circuit configuration, ensures proper isolation, and sequences the switching operations to prevent arcing and circulating currents, thereby improving safety while managing control complexity through intelligent sequencing.
Solution Approach 2:
The patent introduces a vacuum interrupter assembly as an intermediary device between the bypass switch assembly and selector switch assembly. The vacuum interrupter provides electrical isolation and safely interrupts current flow during tap transitions, preventing arcing and circulating currents while maintaining system safety. This intermediary component simplifies the control requirements by providing inherent safety through its vacuum-based arc quenching capability.
3Productivity
If manual or less automated systems are used for tap changing, then the device complexity is lower, but the productivity and efficiency of voltage regulation are reduced
Solution Approach 1:
The patent implements self-service automation where the control circuit automatically monitors transformer voltage conditions and autonomously determines when tap changes are needed. The system self-regulates by comparing actual voltage with reference voltage and automatically initiating tap change operations without manual intervention, improving productivity while managing automation complexity through intelligent voltage regulation algorithms.
Solution Approach 2:
The patent ensures continuous voltage regulation by implementing a control system that continuously monitors transformer output voltage and maintains optimal tap position. The servo motor system enables smooth, continuous adjustments without interruption to power supply, ensuring uninterrupted useful action for voltage regulation while improving productivity through automated continuous monitoring and adjustment capabilities.
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
Enables precise and efficient tap changes with continuous current flow during the process, improving voltage regulation and safety by using feedback signals to accurately position the motor shaft and control the tap change operations, reducing the risk of arcing and circulating currents.
Implementation Method 1
The feedback device is operable to generate a feedback signal containing information relating to the position of the motor shaft
Implementation Method 2
The servo drive uses the feedback signal to determine and store the total angular displacement of the motor shaft
Implementation Method 3
A load tap changer may include, for each phase winding, a selector switch assembly, a bypass switch assembly and a vacuum interrupter assembly
Data Source
AI summary
An on-load tap changer is provided having a plurality of modules, each of which is operable to change taps in a winding of a transformer. A transmission shaft is connected to the modules and is operable upon rotation to effectuate tap changes in the windings. A servo motor rotates the transmission shaft. The servo motor includes a feedback device operable to generate a feedback signal containing information relating to the position of the motor shaft. A servo drive is connected to the servo motor to receive the feedback signal. The servo drive uses the feedback signal to determine and store a total angular displacement of the motor shaft. The servo drive uses the feedback signal and the total angular displacement of the motor shaft to control the operation of the servo motor.