A high-speed railway multi-line shared traction substation system

Abstract

The present invention belongs to the field of traction power supply for electrified railways, and specifically relates to a high-speed railway multi-line shared traction substation system, which aims to solve the problems of high transformation cost and difficulty in achieving precise control of existing substation systems. The traction substation system of the present invention shares an external power supply input line, and the output line supplies power to multiple railway feeders. The main connection adopts a line transformer group connection method to realize the replacement and addition of existing equipment, and achieve the function of multiple feeders sharing a traction substation. The monitoring and protection device is connected to the integrated automation system to detect the status of the power supply system in real time. The method also includes a data processing and transmission module for alarm prompts, and establishes a transformation database to verify the transformation effect to ensure the stability and safety of the traction power supply system. The method of the present invention transforms the traction substation system, has low resource consumption, can achieve precise control, and provides data support for further improving the transformation effect in the future.

Description

Background Art

[0002] With the rapid development of my country's economy, the construction of transportation infrastructure such as railways and urban rail transit is changing with each passing day. As an important part of railways and urban rail transit, traction substations undertake the important task of providing stable and reliable power for trains. However, with the increase in train operation density and the continuous increase in electricity demand, the existing traction substations are facing the problem of insufficient power supply capacity. Therefore, designing traction substations that meet higher requirements has become a necessary technical means to meet the increasing power load demand.

[0003] Existing capacity expansion and reconstruction of traction substations usually involves expanding the site and adding equipment. The addition or replacement of these equipment can improve the power supply capacity, but the implementation process usually encounters site restrictions, resulting in high costs for capacity expansion and reconstruction. Many traction substations are built in urban areas or near transportation hubs, with limited site space. With the development of surrounding infrastructure and the shortage of land resources, it is difficult for existing substations to obtain additional land for expansion. This means that more compact and complex design solutions must be adopted for capacity expansion and reconstruction within a limited site, which increases the difficulty of design and construction and leads to higher costs. Adding transformers and other high-voltage equipment within a limited site requires precise layout and installation. This not only increases the complexity of the design, but also requires special construction techniques to ensure safety and electromagnetic compatibility between equipment. At the same time, in order to comply with safety regulations, a certain safety distance must be maintained between equipment, which further limits the layout space of the equipment. The construction operation space in a small site is limited, and special equipment and technology may be required, which increases the difficulty and time of construction. After the capacity expansion and reconstruction, the operation and maintenance costs of the new equipment are relatively high, further increasing the overall reconstruction cost. The cost of capacity expansion and reconstruction of existing traction substations is high under the condition of limited site size, which has become an important obstacle to system upgrades.

[0004] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve. Summary of the invention

[0005] In order to solve the above-mentioned problem in the prior art, namely the problem of high transformation cost, the present invention provides an innovative traction substation system design solution, which improves site utilization and reduces the demand for new sites by optimizing equipment layout and utilizing existing space, thereby reducing transformation costs and meeting the actual needs of system capacity expansion. Specifically, the present invention provides a high-speed railway multi-line shared traction substation system, and its specific solution is as follows:

[0006] A high-speed railway multi-line shared traction substation system, the traction substation system shares an external power supply, and the outgoing lines supply power to multiple railway feeder lines.

[0007] The traction power transformation system is provided with a first transformer group (100), a second transformer group (200), a high-voltage room switch cabinet and an integrated automation system; the first transformer group (100) and the second transformer group (200) are respectively composed of two single-phase transformers connected in a V, x connection mode; the high-voltage room switch cabinet comprises a first circuit breaker (102), a first disconnector (101), a second circuit breaker (202), and a second disconnector (201); the integrated automation system is provided with a monitoring and protection device for real-time detection of the operating status of the incoming line and feeder equipment of the traction power supply system; the first transformer group (100) and the second transformer group (200) are respectively connected to the common external power supply through the first circuit breaker (102), the first disconnector (101), the second circuit breaker (202), and the second disconnector (201); the equipment parameters are calculated based on the line power supply demand: the reference capacity S of the single-phase transformer is obtained B , short-circuit reactance per unit value X d , working voltage U g and bidirectional peak current I s , through the formula Calculate the short-circuit capacity S d , as the peak operating threshold of the single-phase transformer, and select the equipment model according to the peak operating threshold of the single-phase transformer.

[0008] Preferably, a first current transformer CT1 is arranged on the incoming line of the first transformer group (100), a second current transformer CT2 is arranged on the feeder line of the first transformer group (100), a third current transformer CT3 is arranged on the incoming line of the second transformer group (200), and a fourth current transformer CT4 is arranged on the feeder line of the second transformer group (200).

[0009] Preferably, the single-phase transformer is a 63MVA single-phase, oil-immersed, self-cooled traction transformer.

[0010] Preferably, the first transformer group (100) and the second transformer group (200) adopt a fixed standby mode, one group is in operation and the other group is in standby, and operation / standby switching is performed by a set standby automatic switching device.

[0011] Preferably, the high-voltage room switch cabinet is a 27.5kV GIS switch cabinet; the circuit breaker adopts a vacuum circuit breaker with a spring operating mechanism; the circuit breaker is a 2*27.5kV circuit breaker; the incoming line and feeder adopt 27.5kV high-voltage cable and control cable.

[0012] Preferably, the traction substation system is provided with a data processing and transmission module; the data processing and transmission module processes and transmits the voltage and current values ​​of the power supply arm of the traction power supply system detected in real time, and the transmitted data includes original detection data and calculation and judgment data; the calculation and judgment data gives an alarm prompt by calculating the power factor G, and when the power factor G exceeds the warning range, an alarm signal is transmitted, and the formula is used to calculate the power factor G. The power factor G is calculated, wherein I1 is the incoming line current of the first transformer group (100), I2 is the feeder current of the first transformer group (100), I3 is the incoming line current of the second transformer group (200), I4 is the feeder current of the second transformer group (200), and I s is the overhead contact current of the traction substation system.

[0013] Preferably, the monitoring and protection device is incorporated into the telecontrol system, which is a secondary panel cabinet added to the high-voltage room switch cabinet, and the existing transformer protection panel is modified.

[0014] Preferably, calculation is performed based on the voltage value and current value of the power supply arm obtained by detection to obtain data for verifying the transformation effect.

[0015] Preferably, a transformation database is established based on the verified transformation effect data.

[0016] Another aspect of the present invention provides a method for transforming a traction substation, wherein the method is used to transform the traction substation into the above-mentioned high-speed railway multi-line shared traction substation system.

[0017] A third aspect of the present invention provides a traction substation, comprising: a new traction substation obtained by transforming the above-mentioned high-speed railway multi-line shared traction substation system.

[0018] Beneficial effects of the present invention:

[0019] (1) It saves investment. Multiple lines share one traction station, which reduces repeated equipment purchases and operation and maintenance investment, bringing considerable economic benefits.

[0020] (2) It solves the land acquisition problem and eliminates controlling factors such as the difficulty of site demolition. Existing traction substations usually occupy a large area, making land acquisition difficult and requiring the construction of additional national grid lines. The transformation of local substations requires the construction of additional equipment and buildings, line assembly, iron towers and wire racking. The capacity expansion and transformation technology of multi-line shared traction substations reduces land acquisition, saves investment and solves problems such as long construction period.

[0021] (3) It further improved the rational utilization of high-speed railway traction depots and promoted the high-quality development of my country's high-speed railways. In the existing traction depots, only the transformers and current transformers were replaced, and the rest of the equipment was reused. The equipment functions of the existing traction depots fully meet the needs of multi-line sharing, providing a complete template for the future construction of my country's high-speed railways.

[0022] (4) Establish a transformation database to effectively record the transformation results and provide data support for further improving the transformation results and saving transformation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 This is a basic design diagram of a high-speed railway multi-line shared traction substation system in an embodiment of the present invention;

[0025] Figure 2 It is a flow chart of a practical transformation scheme in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figure 1 and attached Figure 2 The present application is described in detail with reference to embodiments.

[0028] Example 1

[0029] A high-speed railway multi-line shared traction substation system, wherein the incoming and outgoing lines of the shared external power supply of the traction substation in the method adopt a single busbar connection mode; the main connection adopts a line transformer group connection mode, and is provided with two transformer groups, a first transformer group (100) and a second transformer group (200), each transformer group is externally combined by two single-phase transformers to form a V, x connection mode; the first transformer group (100) uses a first circuit breaker (102) and a first disconnector (101), the second transformer group (200) uses a second circuit breaker (202) and a second disconnector (201), the first transformer group (100) uses a first single-phase transformer (103) and a third single-phase transformer (104), and the second transformer group (200) uses a second single-phase transformer (203) and a fourth single-phase transformer (204). Those skilled in the art can understand the technical associations therein. The two transformer groups are connected to the common external power supply through the first circuit breaker (102), the first isolating switch (101) and the second circuit breaker (202), the second isolating switch (201), respectively, so that the two transformer groups can be relatively independent during use. By using a single busbar wiring method, the incoming and outgoing lines of the common external power supply are connected to the single busbar through the circuit breaker and the isolating switch, so that unified management and scheduling of the power supply can be achieved. Two transformer group transformers are set up, each group is composed of two single-phase transformers externally combined into a V,x wiring method, which can effectively prevent global power supply interruption caused by a single device failure. The use of the V,x wiring method allows the two transformer group transformers to be independently controlled and managed during operation. In this way, the system can dynamically adjust the operating state according to the load demand. This flexibility improves the system's adaptability to different load conditions. The single busbar wiring method and the configuration of the two transformer groups also provide convenience for system expansion and future upgrades. Using the single busbar wiring method and the two transformer groups with V,x wiring can achieve higher reliability and flexibility without significantly increasing the number of devices. This design optimizes resource utilization, reduces equipment investment and operating costs, and improves the overall benefits of the system. This transformation method is suitable for the complex operating conditions that high-speed rail traction substations need to face, such as rapid load changes, single-phase load requirements, and high reliability requirements. Through flexible wiring and equipment configuration, these challenges can be better addressed to ensure the stability and efficiency of the system. By adopting standardized equipment and wiring methods, new and old equipment can be seamlessly integrated. This provides a foundation for future system expansion and upgrades, reduces the complexity and cost of transformation, and enables the system to adapt to technological advances and load growth needs more quickly.

[0030] The transformation steps include replacing the transformer with a single-phase, oil-immersed, self-cooled traction transformer as required. Oil-immersed transformers use transformer oil as a cooling and insulating medium and have excellent heat dissipation performance. The self-cooling design relies on natural convection and radiation to dissipate heat, without the need for additional forced cooling devices, reducing failure points and maintenance requirements. Oil-immersed transformers have high overload capacity and durability, and can still maintain a low operating temperature under high load conditions, extending the service life of the equipment and improving the stability and reliability of the power supply system. Oil-immersed, self-cooling transformers usually have good impact and short-circuit resistance, and can effectively cope with sudden faults and load changes in the power system. This feature is particularly important for high-speed rail traction power supply systems, because the power demand during high-speed rail operation changes rapidly and the power supply stability requirements are extremely high. The use of oil-immersed, self-cooling designs can reduce the impact of thermal and mechanical stress on transformers, reduce the risk of equipment aging and damage, and further improve the safety of the system.

[0031] The specific steps to obtain the demand parameters after transformation by calculation are: first, obtain the benchmark capacity S of the single-phase transformer B , short-circuit reactance per unit value X d , working voltage U g and bidirectional peak current I s , and then by the formula:

[0032] (1)

[0033] Calculate the short-circuit capacity S d , as the peak operating threshold of a single transformer, when selecting the transformer model of the first transformer group (100), a value close to and higher than the peak operating threshold may be used as a reference, or a parameter under normal operating conditions may be used as a reference. In order to achieve safer production and operation, this embodiment selects exceeding the peak operating threshold as a selection condition. Among them, the bidirectional peak current I s The formula can be:

[0034] (2)

[0035] Calculate, where I u is the maximum upstream current, I d is the maximum downstream current, P umax is the maximum uplink energy consumption, P dmaxis the maximum downstream energy consumption. In this embodiment, the transformer specifications are selected by the results obtained by calculation. After multiple transformations, the data of each verification of the transformation effect can be analyzed to adaptively adjust the transformer specification selection method for the next transformation. Using this calculation method, if more lines are added, updated calculation results can be obtained. The calculation process is simple, and the calculated total load can meet actual usage requirements. It should be noted that since the two transformers in the V, x connection method can be better used as backup when their performance is close, the first transformer group (100) and the second transformer group (200) have a total of 4 single-phase transformers of the same model, and the selection can be done through one calculation.

[0036] The newly built high-voltage room has a new 27.5kV GIS switchgear, which is consistent with the existing equipment. The 2*27.5kV circuit breakers use vacuum circuit breakers with spring operating mechanisms. Using 27.5kV GIS switchgear that is consistent with the existing equipment can achieve equipment standardization. Standardized design helps to reduce the diversity of equipment types, making procurement, installation, maintenance and management easier and more efficient. The use of consistent equipment models and specifications ensures compatibility between new and old equipment, and can be easily integrated into the existing system, reducing the complexity and risk of error in system integration. The 27.5kV GIS switchgear has high reliability and stability. GIS uses gas insulation, which can effectively prevent the impact of external environmental factors (such as humidity, dust, pollution, etc.) on the equipment, reduce the probability of equipment failure, and improve the reliability of power supply. The vacuum circuit breaker is equipped with a spring operating mechanism and has the ability to quickly cut off and restore current. The arc generated by the vacuum circuit breaker when cutting off the arc is very small, which effectively reduces the loss of the arc to the equipment during the cutting process and improves the service life and safety of the equipment. The combination of vacuum circuit breaker and spring operating mechanism provides more reliable mechanical operating performance. The mechanical design of the spring operating mechanism is simple, the action is reliable, and it is easy to operate and maintain. The modular design and compact structure of the GIS equipment make installation and maintenance more convenient. This is of great significance for high-speed rail traction substations, which require high-frequency maintenance and reliable power supply. Compared with traditional air-insulated switchgear, GIS equipment occupies a smaller area, which is particularly important for high-speed rail traction substations with limited space. The compact design can save space and release more space for on-site operation and maintenance. Due to the sealing and durability of GIS equipment, the maintenance frequency and maintenance cost are low. These equipment usually require less routine maintenance and can operate stably for a long time, reducing the overall operating cost. In the high-speed rail system, the stability and continuity of traction power supply are crucial. By using high-reliability 27.5kV GIS switchgear and vacuum circuit breakers, the stable operation of the power supply system can be ensured under high load conditions, avoiding power supply interruptions caused by switchgear failures. In the power system, reliable circuit breakers and switchgear equipment can quickly cut off the fault circuit when a fault occurs, prevent the fault from expanding, and protect other equipment in the substation and the entire power supply system.

[0037] Replacing the current transformer and busbar fittings enables the current transformer to detect the current of existing incoming lines and feeders, newly added incoming lines and feeders, and the 220kV side. The improvement of the current transformer can provide more accurate current data to the protection relay, thereby optimizing the performance of the protection device. The protection device can make judgments and operations based on more accurate current information, improve the response speed to power grid faults, and reduce the risk of chain reactions caused by faults. With more comprehensive current information, more flexible protection strategies can be formulated according to the characteristics of different lines and equipment. For example, the protection settings can be dynamically adjusted according to the load conditions and current changes to improve the system's adaptability. Replacing the current transformer to meet the needs of new incoming lines and feeders provides a basis for future system expansion and upgrades. New incoming lines and feeders need to monitor the corresponding current to be included in the existing system management to ensure that the same level of protection and monitoring can be maintained when the system is expanded. By upgrading existing equipment instead of building a new independent monitoring system, the cost of transformation can be effectively reduced. Current transformers and busbar fittings that are compatible with new and old equipment can reduce changes to the existing system and achieve economical and efficient system upgrades. Comprehensive current monitoring provides a large amount of operating data that can be used for long-term performance analysis and optimization. Analysis of current data can help identify weak links in the system and take preventive measures in advance, thereby reducing the occurrence of faults. By replacing current transformers and busbar fittings, maintenance personnel can obtain more accurate real-time current information, simplifying the process of equipment inspection and maintenance. This real-time and accurate data feedback can help quickly determine the status of equipment, arrange reasonable maintenance plans, and improve work efficiency. Current transformers can accurately detect current fluctuations and help stabilize the operation of the power supply system. For critical infrastructure such as high-speed rail traction substations, the stability of power supply is directly related to the safety and operating efficiency of trains. Through accurate monitoring of current, power quality problems such as current imbalance or harmonic distortion can be discovered in time, and measures can be taken to adjust them to ensure that the power supply quality meets the standards.

[0038] New 27.5kV high-voltage cables and control cables are added for Hangzhou-Wenzhou incoming lines and feeders.

[0039] A centralized grounding box has been added for Hangzhou-Wenzhou Railway. The centralized grounding box collects and monitors the integrated grounding return current, rail return current, contact network PW line, transformer return current, etc. of Hangzhou-Wenzhou Railway, analyzes them through integrated automation devices, and obtains fault reports and fault point locations when a line or equipment fails. Especially in high-voltage environments, a reliable grounding system is essential to protect the safety of workers and equipment. The centralized grounding box can provide a stable and low-impedance grounding system to effectively reduce grounding resistance. This is critical for the normal operation of traction substations, ensuring that when a fault occurs, the fault current can be quickly released through the grounding system to prevent equipment damage or system failure. By adding a centralized grounding box, the grounding of various types of equipment can be managed uniformly, reducing the complexity and uneven grounding impedance caused by independent grounding of each device, and improving the grounding reliability of the entire system. The centralized grounding box can effectively reduce the electromagnetic interference between various devices in the high-speed rail traction substation and ensure the normal operation of electronic equipment and communication systems. In the environment of high-frequency current and strong electromagnetic field, centralized grounding can provide a common low-potential reference point to reduce the coupling of electromagnetic noise. Some electronic devices are sensitive to electromagnetic interference. Centralized grounding can reduce interference problems caused by differences in ground potential, thereby protecting the stable operation of these sensitive devices. The use of centralized grounding boxes makes the inspection and maintenance of the grounding system more convenient, and can quickly identify problem points in the grounding system, shorten troubleshooting time, and improve maintenance efficiency. Centralized grounding boxes reduce the complexity of grounding wire wiring. Through unified grounding lines and management, the grounding design and installation of substations can be simplified, reducing construction and maintenance costs.

[0040] The secondary monitoring and protection device adopts an integrated automation device, which is connected to the existing integrated automation system and incorporated into the existing telecontrol system. The corresponding secondary panel cabinet is added to the newly added hangwen control room, and the existing transformer protection panel is modified. By adopting the integrated automation device and connecting to the existing integrated automation system, unified management and centralized monitoring of various equipment and protection devices in the traction substation can be achieved. This helps to improve management efficiency, reduce human operation errors, and ensure the safe and stable operation of the system. The use of integrated automation devices can concentrate various operations on one platform, and operators can view and control the operating status of the entire substation in real time on one interface. This centralized management simplifies the operating process, facilitates the training and management of operators, and improves the convenience of system maintenance. The operating status of the system can be monitored in real time, and once an abnormal situation is detected, the fault point can be quickly located. Through rapid fault detection and processing, the impact of faults on system operation can be reduced, and the reliability and stability of the system can be improved. By modifying the existing transformer protection panel and adopting integrated automation devices, the coordination between various protection devices can be optimized. In the event of a fault, the integrated automation system can automatically coordinate the various protection devices to avoid unnecessary tripping and improve the stability of the system. After incorporating the existing telecontrol system, the operating status of the substation can be viewed in real time through the remote monitoring system and can be remotely controlled. This remote operation capability is crucial for timely handling of emergencies, especially when unattended or with limited human resources. Remote operation can greatly improve response efficiency. The access to the telecontrol system can provide a large amount of real-time operating data, which can be used for intelligent dispatching and optimizing grid operation. The dispatch center can adjust the power load distribution based on real-time data, optimize grid operation, and improve the reliability and economy of power supply. By adding secondary cabinets and transforming transformer protection panels, a multi-level protection mechanism can be introduced. The integrated automation device can not only provide protection at the equipment level, but also provide comprehensive protection at the system level, ensuring that there are multiple redundant protection measures when problems occur, thereby improving the safety of the system. The integrated automation system can record a large amount of operating data. By analyzing this data, potential problems can be discovered, and measures can be taken in advance to prevent them, reduce the occurrence of failures, and improve the long-term stability of the system. It also reserves space for future system expansion and upgrades. This flexibility makes it easier for substations to adapt to future technological developments and new needs, such as introducing new protection devices, monitoring equipment, or improving the functions of existing systems. Incorporating existing integrated automation and telecontrol systems helps maintain system compatibility and standardized management, ensuring that all equipment and systems can be seamlessly connected during expansion and transformation, reducing problems caused by equipment incompatibility.

[0041] The voltage and current values ​​of the power supply arm obtained by detection are calculated to obtain the verification transformation effect data. A transformation database is established based on the verification transformation effect data. The transformation effect data includes the voltage and current values ​​of the power supply arm and the recording time, as well as the voltage fluctuation, current fluctuation, power supply stability, and carrying power consumption within a period of time.

[0042] A new data processing and transmission module is added to process and transmit the voltage and current values ​​of the power supply arm of the real-time detection traction power supply system. The transmitted data includes the original detection data and the calculation and judgment data. The calculation and judgment data gives an alarm prompt by calculating the power factor G. When the power factor G exceeds the warning range, an alarm signal is transmitted. The power factor G is calculated by the formula:

[0043] (3)

[0044] Calculation is performed, and an alarm is issued when G is less than 0.02. Including the case where the G value is negative, an alarm needs to be issued, that is, an alarm signal is transmitted. Using such an early warning calculation formula, it is convenient to calculate the abnormal situation of the line.

[0045] Such transformation can save construction time, save area, and achieve the effect of lower overall cost.

[0046] Example 2

[0047] Take the example of the existing Yiwu traction substation and the existing Yiwu renovated new traction substation sharing the external power supply, and the single busbar wiring method is used for the inlet and outlet of the power supply. The inlet and outlet of the shared power supply circuit are connected to the single busbar through circuit breakers and isolating switches. To ensure the reliability of power supply, under normal circumstances, one power supply is used for power supply and the other power supply is used for hot standby.

[0048] The main connection adopts the line transformer group connection mode, with two transformer groups. Each transformer group is composed of two single-phase transformers externally combined into a V, x connection mode. The transformer model specification is 63MVA220±2.5% / 2×27.5kV. When mainly supplying power to one line, the transformer can adopt a fixed standby mode, one group is in operation and one group is in standby mode, and a standby automatic input device is provided. Under normal circumstances, any power supply supplies power to the two independent busbars of the traction power supply system through the corresponding V, x connection transformer (two single-phase transformers); when the operating power supply loses voltage or the transformer fails, the circuit is tripped, and the other power supply and transformer are automatically put into operation, so that the traction power supply system can quickly restore power supply.

[0049] The existing Yiwu renovation and new traction depot high-voltage room provides power for Hangzhou-Changsha High-speed Railway. During this renovation and construction, a new Hangzhou-Wenzhou control room and high-voltage room (including cable mezzanine) will be built in the reserved space on the existing yard to provide power for Hangzhou-Wenzhou High-speed Railway and Jinyi 3rd and 4th Line Railway.

[0050] The "Research on Capacity Expansion and Reconstruction Technology of Yiwu Multi-line Shared Traction Substation in Yiwu Section of Hangzhou-Wenzhou Railway" construction plan shortened the construction period, effectively reduced the impact of land acquisition, avoided land acquisition difficulties, and saved economic costs.

[0051] The main advantages of the "Technical Research on Capacity Increasing and Reconstruction of Yiwu Multi-line Shared Traction Substation in Yiwu Section of Hangzhou-Wenzhou Railway" plan are: 1. It saves investment. Multiple lines share one traction substation, which reduces the repeated purchase of equipment and brings considerable economic benefits in terms of operation and maintenance investment, with a total reduction of 1.9492 million yuan: 6 220kv lightning arresters are reduced, reducing investment by about 118,500 yuan; 6 voltage transformers are reduced, reducing investment by about 328,300 yuan; 4 220kv disconnectors are reduced, reducing investment by 595,200 yuan; 2 220kv circuit breakers are reduced, reducing investment by 662,400 yuan; 2 10kV self-use transformers are reduced, reducing investment by 103,200 yuan; 2 10kV load switch cabinets are reduced, reducing investment by 141,600 yuan. The promotion of the standardized construction plan of the research department is of great significance to ensuring the safety of construction and operation, ensuring construction quality, and reducing labor input. 2. Solved the land acquisition problem and eliminated the control factors such as the difficulty of demolition of the site. There are currently two traction stations in Yiwu. The traction station occupies a large area, and it is difficult to acquire land. In addition, it needs to increase the construction of the national power grid. The transformation of local substations requires the addition of equipment and houses, line assembly, iron tower and line erection, etc. The capacity expansion and transformation technology of multi-line shared traction substations reduces land acquisition, saves investment and solves problems such as long construction period. 3. Further improved the rational use of high-speed rail traction stations, and helped the high-quality development of my country's high-speed rail. The existing Yiwu renovation and new traction station only replaced the transformer and current transformer, and the rest of the equipment was reused. The equipment functions of the existing traction station fully meet the needs of multi-line sharing, providing a complete template for the future construction of my country's high-speed rail.

[0052] Example 3

[0053] The renovation construction is divided into two steps: the first step is to replace the primary equipment, and the secondary line of the primary equipment remains the same. The external power supply line is used for single-side power outage, and the traction station transformer has no backup. The construction period for dismantling and replacing the existing transformer is 6 days, and the transformer secondary circuit test and debugging requires 3 skylight points.

[0054] The second step is to transform the integrated automation system. The existing integrated automation system will be dismantled according to the drawings and the wiring will be transformed. The external power supply line will be cut off on one side, and the traction station will have no backup. The transformation and test commissioning construction period is 12 days, and all construction will be done within the skylight point.

[0055] Through the economic and technical selection of different main wiring schemes for multi-line shared traction substations, the optimal multi-line shared traction substation capacity expansion and transformation construction, testing, and commissioning construction scheme is obtained, which provides a reference for future engineering projects to form a set of multi-line shared traction substation design, construction, and operation standardization system. Multiple lines share one traction substation, which brings considerable economic benefits in reducing land acquisition and demolition, repeated equipment purchase, and operation and maintenance investment.

[0056] Although the various steps in the above embodiment are described in the above order, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in such an order, and they can be executed simultaneously (in parallel) or in a reverse order. These simple changes are within the scope of protection of the present invention.

[0057] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process and related instructions of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0058] It should be noted that the high-speed railway multi-line shared traction substation system provided in the above embodiment is only illustrated by the division of the above method steps. In practical applications, the above function allocation can be completed by different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be decomposed or combined. For example, the modules in the above embodiment can be combined into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not regarded as improper limitations of the present invention.

[0059] The terms "first", "second", etc. are used to distinguish similar objects rather than to describe or indicate a particular order or sequence.

[0060] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0061] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A high-speed railway multi-line shared traction substation system, the traction substation system shares an external power supply, and the outgoing line supplies power to multiple railway feeder lines, characterized in that: The traction power transformation system is provided with a first transformer group (100), a second transformer group (200), a high-voltage room switch cabinet and an integrated automation system; The first transformer group (100) and the second transformer group (200) are respectively composed of two single-phase transformers connected in a V, x manner; the high-voltage room switch cabinet comprises a first circuit breaker (102), a first disconnector (101) and a second circuit breaker (202), a second disconnector (201); the integrated automation system is provided with a monitoring protection device to detect the operating status of the incoming line and feeder equipment of the traction power supply system in real time; The first transformer group (100) and the second transformer group (200) are connected to the common external power supply via a first circuit breaker (102), a first isolating switch (101), a second circuit breaker (202), and a second isolating switch (201), respectively; Calculate equipment parameters based on line power requirements: Obtain the reference capacity S of the single-phase transformer B , short-circuit reactance per unit value X d , working voltage U g and bidirectional peak current I s , through the formula Calculate the short-circuit capacity S d , as the peak operating threshold of the single-phase transformer, and selecting the device model according to the peak operating threshold of the single-phase transformer, The traction substation system is provided with a data processing and transmission module; The data processing and transmission module processes and transmits the voltage and current values ​​of the power supply arm of the traction power supply system detected in real time, and the transmitted data includes original detection data and calculation and judgment data; The calculation judgment data gives an alarm prompt by calculating the power factor G. When the power factor G exceeds the warning range, an alarm signal is transmitted. The power factor G is calculated, wherein I1 is the incoming line current of the first transformer group (100), I2 is the feeder current of the first transformer group (100), I3 is the incoming line current of the second transformer group (200), I4 is the feeder current of the second transformer group (200), and I s is the overhead contact current of the traction substation system.

2. The high-speed railway multi-line shared traction substation system according to claim 1, characterized in that: A first current transformer CT1 is arranged on the incoming line of the first transformer group (100), a second current transformer CT2 is arranged on the feeder line of the first transformer group (100), a third current transformer CT3 is arranged on the incoming line of the second transformer group (200), and a fourth current transformer CT4 is arranged on the feeder line of the second transformer group (200).

3. The high-speed railway multi-line shared traction substation system according to claim 1, characterized in that: The single-phase transformer is a 63MVA single-phase, oil-immersed, self-cooling traction transformer.

4. The high-speed railway multi-line shared traction substation system according to claim 1, characterized in that: The first transformer group (100) and the second transformer group (200) adopt a fixed standby mode, one group is in operation and the other group is in standby mode, and operation / standby switching is performed through a set standby automatic switching device.

5. The high-speed railway multi-line shared traction substation system according to claim 1, characterized in that: The high-voltage room switch cabinet is a 27.5kV GIS switch cabinet; the circuit breaker adopts a vacuum circuit breaker with a spring operating mechanism; the circuit breaker is a 2*27.5kV circuit breaker; the incoming line and feeder adopt 27.5kV high-voltage cable and control cable.

6. The high-speed railway multi-line shared traction substation system according to claim 1, characterized in that: The monitoring and protection device is incorporated into the telecontrol system, which is a secondary panel cabinet added to the high-voltage room switch cabinet to transform the existing transformer protection panel.

7. The high-speed railway multi-line shared traction substation system according to claim 1, characterized in that: The voltage and current values ​​of the power supply arm obtained by detection are calculated to obtain data for verifying the transformation effect.

8. The high-speed railway multi-line shared traction substation system according to claim 7, characterized in that: A transformation database is established based on the verified transformation effect data.

9. A method for transforming a traction substation, characterized in that: The method is used to transform the traction substation into a high-speed railway multi-line shared traction substation system as described in any one of claims 1-8.

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