Study for the Formulation of High Speed Railway Projects on Hanoi
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Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- Title Ⅲ-136 1 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- This is contents of the presentation. As you can see here, I am going to explain these six (6) points. Ⅲ-137 2 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- I am going to explain about the view of electrification. First, we need to receive electric power from Ultra‐High Voltage Grid of power company to traction substation for railway. EVN(Electric of Vietnam) supplies 500KV,220KV and 110KV ultra high voltage grids. We recommend to use the 220KV grid. At this substation, three phase lines are converted to two sets of single phase line. We need to convert three phase to single phase. At the same time, 220KV voltage is converted to 25KV. I will explain about SP and SSP later. Ⅲ-138 3 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- This figure is single phase AC (Alternative Current) feeding system. Rolling stock needs single phase electric power. As I explained in previous slide, this traction transformer converts the phase from three phase to two sets of single phase. Ⅲ-139 4 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- This is a panoramic view of Substation. We need a very large vast land, about 18,000㎡, 90m by 200m. Ⅲ-140 5 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- Again, this is a panoramic view of Traction Substation and Feeding Transformer. Ⅲ-141 6 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- This is the exterior of Auto Transformer (AT). I will explain about AT later. Ⅲ-142 7 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- This is a transformer called Modified Wood‐Bridge Transformer. This is used as a standard transformer for Shinkansen in Japan. Because of characteristics of this transformer, electric power from a pair (A phase and B phase) of single phases is not even. So we need to put the Step Up Transformer on one of the Single Phase (B phase). The transformer on the right in this picture is Step Up Transformer. Ⅲ-143 8 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- In order to improve this situation (Modified Wood‐Bridge connected Transformer needs Step up transformer), this Roof Delta connected Transformer was completed after research and development started in 1999. This transformer has no Step up transformer. This transformer was used for Japanese Tohoku Shinkansen which started its operation in December 2010. As you can see, this transformer is small and light. The construction cost is also cheaper than the other transformers. Ⅲ-144 9 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- As you can see in this chart, there are 3 methods to feed electric power to a train and each country uses different method. The first one is Simple Feeding System. This is very simple and just allocates single phase transformers along railway lines. Merit is that construction cost is cheap. Demerit is that number of transformers increases. Also, return current leaks into the ground and causes Inductive interference to the communication lines along the railway . The second one is Booster transformer Feeding System. This reduces Inductive interference because Booster Transformers absorb return current. However, in order to insert BT (booster transformers), Air Section needs to be installed. Demerit is that electric arc occurs when a train passes each air section and damages contact wires. It also causes noise. The third one is Auto Transformer Feeding System. Merit is that we can make feeding voltage from transformers twice the volume of contact wire Voltage, and as a result, we can make the distance between transformers longer. In addition, inductive interference doesn’t occur and we don’t have problems with electric arc. The only demerit is that construction cost is expensive. Ⅲ-145 10 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- I would like to explain about Air Section here. In this figure, we are looking at a train and wires from above. As you can see, contact wire A and contact wire B are not connected and there is some space between contact wire A and contact wire B. Because of this space, electric power is cut off. When a train comes into this section from the right side, a pantograph touches contact wires and electric power will be supplied from contact wire B to contact wire A. Ⅲ-146 11 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- This is an illustration of Booster Transformer Feeding System. As you can see, electric arc occurs at booster section. Ⅲ-147 12 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- This is an illustration of Auto Transformer Feeding System. Ⅲ-148 13 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT Technical Report 7 Test Tracks, Technical Discussions on Semi-High-Speed Railways and Work Shop ----------------------------------------------------------------------------------------------------------------------------------------------------- We have to install a sectioning post between substations ,because we cannot connect different power sources with each other. At this post, we need Air Section in order to separate different power sources. This post is called Sectioning Post. We want to minimize sections to cut electric power during accidents and maintenance. In case of accidents and maintenance, we install Sub Sectioning Posts for our convenience. Ⅲ-149 14 Study for the Formulation of High Speed Railway Projects on Hanoi-Vinh and Ho Chi Minh-Nha Trang Section FINAL REPORT