Sliding Contact Arc Arresting Device for Rail Vehicles
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Solution Overview
Problem
Sliding contact devices used for powering vehicles via contact wires often experience arc formation due to frost, ice, or humidity, leading to damage from electrical flashovers and increased maintenance needs, as existing solutions like airflow guidance are not effective at low speeds or when stationary.
Innovation Solution
A sliding contact device with a catching device composed of multiple catch elements along the longitudinal side of the support profile, designed to selectively divert arcs away from the contact strip and support profile, providing a low-impedance path and preventing direct strikes, which can be easily replaced when damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If airflow guidance is used to divert arcs, then arcs are deflected from the contact strip carrier, but arcs can still jump between the contact wire and contact strip carrier at low speeds or when stationary
Solution Approach 1:
The arc arresting device is divided into multiple arresting elements (first arresting element, second arresting element, etc.) arranged along the longitudinal side of the support profile. Each element provides a separate arc diversion path, ensuring that arcs are intercepted regardless of vehicle speed or contact wire position. This segmented approach replaces the single airflow-dependent path with multiple independent protection points.
Solution Approach 2:
The arresting elements serve as intermediary structures between the contact wire and the contact strip carrier. These elements provide a controlled path for arc discharge, intercepting arcs before they reach the contact strip carrier. The intermediaries are positioned to catch arcs in various scenarios (stationary, low speed, high speed) without relying on airflow conditions.
2Object-affected harmful factors
If arcs are diverted via the contact strip, then arcs are redirected from the support profile, but the contact strip is undesirably heated
Solution Approach 1:
The arc diversion function is extracted from the contact strip and assigned to dedicated arresting elements on the support profile. By removing the arc diversion task from the contact strip, the contact strip is no longer exposed to arc-induced heating, while the support profile's arresting elements are specifically designed to handle arc discharge without compromising the contact strip's integrity or performance.
3Strength
If the contact strip carrier is made of metal, then structural strength is improved, but the carrier is severely damaged by arcs requiring shorter inspection and replacement intervals
Solution Approach 1:
The arresting elements are positioned in advance to intercept arcs before they can reach the metal contact strip carrier. This preventive arrangement cushions the carrier against arc damage by providing a first line of defense. The arresting elements absorb the arc energy, preventing direct strikes to the carrier and extending its service life without compromising structural strength.
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
Effectively prevents arc-induced damage by ensuring arcs are diverted and extinguished, extending the service life of the sliding contact device and reducing material consumption, even at low speeds or when stationary, thereby reducing maintenance and operational costs.
Implementation Method 1
providing a low-impedance path and preventing direct strikes
Implementation Method 2
the arc is extinguished when the contact wire moves zigzag-like along the contact strip... the arc is interrupted and thus extinguished
Data Source
Figure 1~8
AI summary
The invention relates to a sliding contact device (19) and a method for deriving electric arcs on a sliding contact device, in particular for supplying power to vehicles by means of a contact wire, wherein the sliding contact device comprises a frictional strip carrier unit (20) and a frictional strip (21) arranged thereon, wherein the frictional strip carrier unit has a catching unit (23) for electric arcs (24), wherein the catching unit is arranged on a longitudinal side (26) of a support profile (22) of the frictional strip carrier unit, wherein the catching unit is formed from a plurality of catch elements (29) arranged along the long side.