Double Dead Band Tap Switch Control for Transformer Lifespan
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Solution Overview
Problem
Frequent tap operations in tap switching devices due to voltage fluctuations in distributed power systems lead to reduced transformer lifespan, and existing solutions like energy storage devices are costly and impractical.
Innovation Solution
A tap switch control method using a double dead band system, which measures and calculates a second dead band and reference voltage to determine when to adjust the transformer tap, reducing unnecessary operations and extending transformer lifespan without additional costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tap switching operations are performed frequently to adjust voltage in distributed power systems, then voltage adjustment capability is improved, but transformer lifespan is reduced
Solution Approach 1:
The patent applies a double dead band mechanism that dynamically adjusts the voltage threshold parameters for tap switching operations. By implementing two different dead band values (first dead band for initial comparison, second dead band for final decision), the system changes the operational parameters to reduce unnecessary tap operations while maintaining voltage adjustment capability when truly needed.
Solution Approach 2:
The control device acts as an intermediary between the voltage fluctuation detection and the tap switching execution. It introduces a dual-comparison mediation process that filters out minor voltage fluctuations, allowing only significant voltage deviations to trigger tap operations, thereby protecting the transformer from excessive operations.
2Reliability
If energy storage devices or compensation devices are installed to compensate for distributed power source output fluctuations, then voltage stability is improved, but installation and operation cost increases significantly
Solution Approach 1:
The patent enables the tap switching device itself to serve as the compensation mechanism by implementing intelligent control logic. The system uses its own measurement and control capabilities to detect voltage fluctuations and make appropriate tap adjustments, eliminating the need for external energy storage devices or compensation equipment.
Solution Approach 2:
The patent extracts the voltage stabilization function from external compensation devices and relocates it to the tap switching device's control system. By moving the stabilization capability into the existing transformer control, the system eliminates the need for separate expensive compensation equipment.
3Speed
If tap operations are performed based on single dead band comparison, then voltage adjustment responsiveness is improved, but frequent unnecessary operations occur due to voltage fluctuations
Solution Approach 1:
The patent segments the single dead band comparison into two distinct stages: first dead band comparison for initial screening and second dead band comparison for final decision. This segmentation allows the system to quickly filter out minor fluctuations while maintaining responsiveness to significant voltage deviations, reducing unnecessary operations.
Solution Approach 2:
The first dead band comparison serves as a preliminary action that pre-filters voltage fluctuations before the final tap switching decision. By performing this preliminary check, the system prepares for potential tap operations only when necessary, improving operational efficiency while maintaining responsiveness.
Data Source
AI summary
The present invention relates to a tap switch control method, which comprises the steps of: measuring data of a distribution system; calculating a second dead band and a reference voltage using the measured data; comparing the difference between the measured actual voltage and the reference voltage with a first dead band; comparing the difference between the actual voltage and the reference voltage with the second dead band, when the difference between the actual voltage and the reference voltage is outside the first dead band as a result of the comparison with the first dead band; and controlling the tap of the transformer, when the difference between the actual voltage and the reference voltage is outside the second dead band as a result of the comparison with the second dead band. Accordingly, it is possible to suppress a frequent operation of tap switching due to the fluctuations of the system and distributed power supply by applying the double dead band and to ensure the transformer's lifespan.