Converter Device Open Phase Detection for Twelve-Phase Transformers
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Solution Overview
Problem
In twelve-phase rectification transformers, it is difficult to determine whether an open phase occurs on the Δ connection side or the Y connection side when it is present.
Innovation Solution
A converter device is designed with a converter circuit unit, a current detection unit, an open-phase detection unit, and an output unit that can identify whether an open phase occurs on the Δ connection side or the Y connection side by analyzing detection signals and current values, allowing for accurate indication of the open phase location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a twelve-phase rectification transformer is configured with Δ connection and Y connection on the secondary side, then twelve-phase rectification can be performed to suppress harmonic outflow, but it becomes difficult to determine whether an open phase occurs on the Δ connection side or the Y connection side
Solution Approach 1:
The detection function is segmented into two separate detection units: one dedicated to detecting open phases on the Δ connection side and another for the Y connection side. Each detection unit independently monitors its respective connection type, allowing precise identification of which side experiences the open phase condition without interference from the other connection type.
Solution Approach 2:
A determination unit acts as an intermediary that receives detection results from both detection units and integrates this information with current values from the converter circuit unit. This intermediary processing layer synthesizes the data to determine the overall system state and identifies whether the open phase occurs on the Δ connection side, Y connection side, or both sides simultaneously.
2Measurement precision
If open phase detection is performed on both Δ connection side and Y connection side simultaneously, then accurate open phase location can be identified, but the device complexity increases
Solution Approach 1:
The detection units are designed with universal functionality to handle both Δ connection and Y connection detection using the same basic detection mechanism. This multi-functional approach allows the system to detect open phases on either connection type without requiring entirely separate detection systems, thereby reducing overall complexity while maintaining high measurement precision.
Solution Approach 2:
The system implements feedback through the determination unit that continuously monitors detection results from both detection units and adjusts its determination logic based on the combined information. This feedback mechanism allows the system to accurately identify open phase locations by processing detection signals and current values in real-time, achieving high precision without proportionally increasing complexity through intelligent signal processing.
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 converter device effectively outputs an indication of whether an open phase is present on the Δ connection side or the Y connection side, enabling precise identification and addressing the challenge of determining the open phase location.
Implementation Method 1
a converter circuit unit that converts alternating-current voltages supplied from two systems, which are a Δ connection and a Y connection of a twelve-phase rectification transformer, into a direct-current voltage
Implementation Method 2
a current detection unit that detects a current of a direct-current bus connected to the converter circuit unit
Data Source
AI summary
A converter device includes: a converter circuit unit converting alternating-current voltages from a Δ connection and a Y connection of a twelve-phase rectification transformer, into a direct-current voltage; a current detection unit detecting a current of a direct-current bus connected to the converter circuit unit; an open-phase detection unit connected to a side of the Δ or Y connection to detect whether open phase is caused in the connection connected thereto; and an output unit outputting, when detected that there is open phase caused in the Δ or Y connection based on a detection signal of the open-phase detection unit and a current value of the direct-current bus detected by the current detection unit, an indication that open phase is caused in the Δ or Y connection. When open phase is caused, it is possible to output an indication of whether the open phase is caused on the Δ or Y connection side.