Neutral Section Passing Control for Double-Pantograph EMU Trains
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-locomotive short broke trains with double-raised pantographs can generate an interphase short circuit when the distance between them is shorter than the neutral zone but longer than the no-electricity zone of a neutral section, causing safety issues during neutral section passing.
Innovation Solution
A control method and system that involves a primary multiple unit collecting a neutral section passing instruction signal, controlling the unloading of traction force and main breaker, and calculating real-time distance traveled to ensure safe passage by coordinating the pantograph operation of both units, preventing interphase short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-locomotive short broke trains operate with double-raised pantographs to improve power supply reliability, then power supply continuity is improved, but interphase short circuit risk increases when pantograph distance is between no-electricity zone length and neutral zone length
Solution Approach 1:
The control system performs preliminary actions by detecting neutral section approach in advance, issuing advance notifications to both multiple units, and coordinating their pantograph operations before entering the neutral section. The primary multiple unit lowers its pantograph before entering the neutral section, and the secondary multiple unit follows suit after receiving the completion command, ensuring both pantographs are lowered before any interphase short circuit could occur.
Solution Approach 2:
The system dynamically adjusts pantograph operations based on real-time position and speed data. The control system continuously monitors the train's approach to the neutral section, calculates entry timing based on current speed, and dynamically coordinates the lowering and raising of pantographs for both multiple units to ensure safe passage through the neutral section without interphase short circuit.
2Duration of action of stationary object
If automatic or manual neutral section passing control is used to extend pantograph service life, then pantograph and contact network durability is improved, but interphase short circuit cannot be prevented when double-raised pantographs span two neutral sections
Solution Approach 1:
The control system implements feedback mechanisms by continuously monitoring the train's position, speed, and approach to neutral sections. The system receives feedback from speed sensors and position detectors, processes this information to calculate timing for pantograph operations, and adjusts the control commands accordingly. The secondary multiple unit receives feedback from the primary multiple unit's completion command to coordinate its pantograph raising operation.
Solution Approach 2:
The control system acts as an intermediary between the two multiple units, coordinating their pantograph operations. The primary multiple unit's controller serves as the lead, and the secondary multiple unit's controller follows its commands, ensuring synchronized operations that prevent interphase short circuits while maintaining extended pantograph service life through proper neutral section passing control.
3Reliability
If real-time distance calculation and coordinated pantograph operation control are implemented to prevent interphase short circuit, then safety is improved, but control system complexity increases
Solution Approach 1:
The control system merges the control functions of both multiple units into a coordinated system. The primary multiple unit's controller and secondary multiple unit's controller are integrated through communication links, allowing them to share neutral section passing instructions and completion commands. This merging enables centralized coordination of pantograph operations while using existing control infrastructure, preventing interphase short circuits without requiring completely separate control systems for each unit.
Solution Approach 2:
The control system achieves multi-functionality by using the existing control devices in both multiple units for dual purposes: their original functions plus coordinated neutral section passing control. The controllers utilize existing speed sensors, position detectors, and communication systems to perform real-time distance calculation and pantograph coordination, maximizing the use of existing infrastructure while adding safety functionality without proportionally increasing system complexity.
Data Source
AI summary
A control method and system of neutral section passing of multi-locomotive short broke trains. Distance traveled by a train after a primary multiple unit enters a neutral section is calculated in real time, so that a neutral section passing procedure of a secondary multiple unit is effectively controlled, thereby solving the problem that when the multi-locomotive short broke trains operate with double-raised pantographs, if the distance between the two pantographs is shorter than the length of a neutral zone of a neutral section and longer than the length of a no-electricity zone of the neutral section, when the two pantographs pass through the neutral sections, the two pantographs will span the two neutral sections and generate an interphase short circuit. The method improves safety of the EMU when it passing neutral section and ensure that the EMU can reliably pass through the neutral section with double-raised pantographs. The present invention has the advantages of being safe, reliable, easy to implement and convenient to promote and apply.