Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
機場捷運軌道電路填裝果凍膠施工成效說明 Performance of Jelly Adhesive Filling for TIAA MRT Track Circuit
軌道電路示意圖。

軌道電路為捷運號誌系統非常重要的一環,用於持續監視軌道淨空或軌道佔據的情況。其運作原理是在路軌上截取適當長度鋼軌,並將兩端絕緣,從而構成一組獨立的電路區間。當區間無列車行駛時,電流會經由鋼軌到達繼電器,使其激磁同時電路接點被吸向上方,將綠燈電路接通。
當有列車駛進此區間時,鋼軌中的電流便會被車軸短路,繼電器因失去電流而斷磁,電路接點亦隨即落下並接通紅燈之電路,以阻止其他列車進入此區間。當列車駛離此區間,繼電器便會重新激磁,使綠燈再次亮起,讓其他列車進入此區間。
因機場捷運工程測試階段,軌道電路持續發生誤佔據現象,現場勘查發現疑是TU箱體之電纜端子因水氣進入導致纜線氧化接觸不良所致,針對TU箱體水氣進入現象,經與專家學者研商後,決定採用自復型防水膠填充方式進行改善。
自復型防水膠(俗稱果凍膠)的硬度極軟,適用於填充、防水、緩衝用途,其特性如下:室溫環境即可混合施工、可滲入元件內極小空間形成保護、可透視膠體內部、測試探針可直接插入膠體進行測試等。可全面提升箱體的防水性能,膠體包覆組件可減少因震動造成的零件鬆脫或損壞,且不會造成電磁波或頻率的干擾或阻隔,不影響原有設備功能。
為利機場捷運後續整體測試作業進行,廠商於104年10月起至105年1月止,已完成全線545組軌道電路TU箱體灌注果凍膠作業。依設備異常紀錄總表所示,發生軌道電路異常(RSF)事件,灌注果凍膠前平均每月約130次,灌注果凍膠後,統計104年10月至105年1月止,發生次數已大幅減少至平均每月20次以下,目前正持續觀察其改善成果。

The track circuit is a very important part in the TIAA MRT signaling system to continuously monitor the status of track clearance and occupation. Its principle of operation is to intercept an appropriate length of rail tracks and insulate both ends thereby constituting an independent circuit section. When there is no train operating on the section, the current will arrive at relay via the rail and simultaneously suck the circuit contact point upwards to turn on the green light circuit.
When a train is operating in the section, the current in the rail will short circuit by the train axel; the current will not reach relay and the contact point will drop down and turn on the red light circuit. When the train leaves this section, the relay will re-excite and turn the green light on once again allowing other trains to enter the section.
In the testing phase of TIAA MRT Project, there were persistent track circuit occupational errors and after onsite investigation, was suspected to be water vapor entering the cable terminal in the TU box that led to incomplete contact caused by oxidation of the cable. After discussion by experts and scholars, improvement measures were decided to use self-recovery waterproof adhesive to fill the interspace.
The self-recovery waterproof adhesive (commonly known as jelly adhesive) is extremely soft and is suitable for filling, waterproofing and buffering purposes. Its features are as follows: able to be mixed and applied at room temperature, can penetrate extremely small space between elements to form protection, transparent to the interior of the colloid and test probes can be inserted directly into the colloid for testing. By applying the jelly adhesive, waterproof features of the TU box will be enhanced and damage of colloid-coated components caused by vibration will be reduced. Additionally, the adhesive will not cause electromagnetic or frequency interference and blockage so will not affect the functionality of the original equipment.
To ensure a smooth testing process of TIAA MRT Project, the contractor has finished 545 sets of adhesive-filling for TU boxes on the entire track circuit during 2015 October to 2016 January. According to the equipment malfunction record, the number of rail system failure (RSF) incidents has substantially declined. There were 130 incidents per month before the adhesive-filling procedure and now, from 2015 October to 2016 January, there were only an average below 20 incidents per month and the outcomes are continued to be observed.

  • TU箱體填裝果凍膠成果。
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