The invention discloses an electrified railway connected power supply structure, which relates to the technical field of AC traction power supply of rail traffic. For more than two main substation, the primary side is connected to the same network, secondary feeder for medium voltage wire and medium voltage line; a step-down transformer medium voltage power supply line and the return line after a certain interval of medium voltage connected to the power line contact and contact line; medium voltage power supply line and the return line, medium voltage supply lines and contact the contact line is carried out in the step-down transformer at the contact line of the power supply section; main substation range and contact voltage phase between the same line; contact power supply line and return line contact to train power; under normal circumstances, between two adjacent main substation for medium voltage and medium voltage wire back line between do not connect, and the adjacent contact between the wires for connectivity, contact between back line connectivity, continuous power supply train; step-down transformer primary winding neutral point grounding out, can inhibit the electric system Pressure. Mainly used in rail transit power supply.
【技术实现步骤摘要】
本专利技术涉及轨道交通的单相工频交流牵引供电
技术介绍
干线电气化铁路牵引供电系统普遍采用单相工频交流制,通过牵引网为电气列车牵引负荷供电。为使单相的牵引负荷在三相电网中尽可能均匀分配,牵引网采用了轮换相序、分相分区供电的方案。分相分区处的相邻供电区之间用分相绝缘器分割,形成电分相,也称分相。电分相是牵引网最薄弱的环节和供电瓶颈,电气列车通过电分相最易引发事故,影响供电和行车安全。解决电分相不外有两种方法:一是采用自动过分相技术,一是取消电分相。对于前者,存在开关自动切换时的车、网暂态电气过程,易产生较大的操作过电压或过电流,造成牵引网与车载设备烧损等事故,甚至出现自动过分相失败,影响供电可靠性和列车安全运行。因此,即使是采用自动过分相技术,电分相环节仍然是整个牵引供电系统中的薄弱环节。对于后者,则分两种情形:一种是取消牵引变电所出口处的电分相,可以采用同相供电技术;另一种是取消分区所处的电分相,需实施双边供电,其关键是减小因牵引网与电网并联而在牵引网中产生的均衡电流,使其达到所允许的程度。为此,专利技术人曾申请了“一种电气化铁路双边供电系统(201310542875.X)”专利并获得授权。其技术方案是串接电抗器,其原理是增加牵引网阻抗来减少其中的均衡电流。我们注意到,若牵引变电所进线电网电压为110kV而牵引网采用55kV AT供电方式(变比=110/55=2)时,用串接电抗器增加牵引网阻抗将其中的均衡电流减少到应有的程度(如1%以下)是做不到的,其原因是变比太小,串接电抗器的阻抗取值因受到电压损失限制而不能过大,归算至电网侧的阻抗(即变比平 ...
【技术保护点】
一种电气化铁路连通供电构造,电气化铁路牵引供电系统包括两个或两个以上主变电所,主变电所原边连接于同一电网,记两个相邻的主变电所分别为主变电所SSi和主变电所SSj,其特征在于:主变电所SSi次边馈出中压供电线PSi和中压回流线PRi,中压供电线PSi和中压回流线PRi经沿线的降压变压器Ti1和Ti2连接到接触供电线CSi和接触回流线CRi,即降压变压器Ti1和Ti2原边两端子分别连接到中压供电线PSi和中压回流线PRi,次边两端子分别连接到接触供电线CSi和接触回流线CRi;中压供电线PSi和中压回流线PRi在降压变压器Ti1和Ti2原边经开关B分段,接触供电线CSi和接触回流线CRi在降压变压器Ti1和Ti2次边经开关K分段;接触供电线CSi和接触回流线CRi给列车L供电;主变电所SSj次边馈出中压供电线PSj和中压回流线PRj,中压供电线PSj和中压回流线PRj经沿线的降压变压器Tj1和Tj2连接到接触供电线CSj和接触回流线CRj,即降压变压器Tj1和Tj2原边两端子分别连接到中压供电线PSj和中压回流线PRj,次边两端子分别连接到接触供电线CSj和接触回流线CRj;中压供电线P ...
【技术特征摘要】
1.一种电气化铁路连通供电构造,电气化铁路牵引供电系统包括两个或两个以上主变电所,主变电所原边连接于同一电网,记两个相邻的主变电所分别为主变电所SSi和主变电所SSj,其特征在于:主变电所SSi次边馈出中压供电线PSi和中压回流线PRi,中压供电线PSi和中压回流线PRi经沿线的降压变压器Ti1和Ti2连接到接触供电线CSi和接触回流线CRi,即降压变压器Ti1和Ti2原边两端子分别连接到中压供电线PSi和中压回流线PRi,次边两端子分别连接到接触供电线CSi和接触回流线CRi;中压供电线PSi和中压回流线PRi在降压变压器Ti1和Ti2原边经开关B分段,接触供电线CSi和接触回流线CRi在降压变压器Ti1和Ti2次边经开关K分段;接触供电线CSi和接触回流线CRi给列车L供电;主变电所SSj次边馈出中压供电线PSj和中压回流线PRj,中压供电线PSj和中压回流线PRj经沿线的降压变...
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