Traction power supply system voltage mutual fuse monitoring method, system and device

Abstract

The invention discloses a traction power supply system voltage mutual fuse monitoring method, system and device, relates to the technical field of traction power supply systems, and solves the problems that the existing traction power supply integrated automation system cannot monitor the continuous fusing process of a fuse, resulting in that the PT voltage is lower than the actual operation voltage, and the safety is poor. According to the technical scheme, the method is characterized in that according to the power supply characteristics of a traction substation, the operation condition of a voltage transformer of the substation is automatically recognized, and a fuse monitoring method of the voltage transformer is automatically selected according to the operation condition of the voltage transformer; and monitoring and early warning of incomplete fusing of the voltage transformer fuse are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of traction power supply systems, and more particularly, to a method, system and device for monitoring voltage mutual fuses in a traction power supply system. Background Art

[0002] Voltage transformers (PTs) are key components in traction power supply systems, responsible for voltage conversion and signal transmission. Their condition directly impacts system measurement accuracy and protection reliability, making them crucial for safe and stable system operation. To prevent damage to the PTs from overcurrent or short-circuit faults, a fuse (RD) is typically connected in series with each of their primary and secondary sides. However, current traction power supply integrated automatic systems can only detect PT disconnections, meaning they only issue an early warning after the fuse has completely blown. On some railway lines, due to differences in traction substation operating conditions, PT manufacturer manufacturing processes, and the integrated automatic protection PT disconnection detection principles, fuses may continue to blow, typically lasting two to three days. During this period, the PT voltage is lower than the actual operating voltage. If a heavily loaded train passes through the power supply section, this can cause the protection circuit breaker to trip, compromising train safety.

[0003] To this end, the present application provides a method, system and device for monitoring voltage mutual fuses in a traction power supply system to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this application is to provide a method, system and device for monitoring the voltage transformer fuse in a traction power supply system, so as to solve the problem that the existing traction power supply integrated automatic system cannot monitor the continuous melting process of the fuse, resulting in the PT voltage being lower than the actual operating voltage, which may cause the protection to malfunction and trip when a heavy-loaded train passes through the power supply section; the present invention automatically identifies the operating conditions of the voltage transformer of the substation according to the power supply characteristics of the traction substation, and automatically selects the fuse monitoring method of the voltage transformer according to the operating conditions of the voltage transformer (single voltage transformer and double voltage transformer), so as to realize the monitoring and early warning of the voltage transformer fuse not being completely blown.

[0005] The first aspect of the present application provides a method for monitoring voltage mutual fuses in a traction power supply system, including: obtaining the input status of the voltage mutual soft pressure plate on the bus, and determining the voltage mutual input operation status on the bus according to the voltage mutual voltage value and the set voltage value, including: double voltage mutual input operation, single voltage mutual input operation and no voltage mutual input operation; when there is no voltage mutual input operation, directly issuing an early warning signal to indicate that the bus has no voltage mutual input operation, and when double voltage mutual input operation or single voltage mutual input operation, executing the corresponding voltage mutual fuse monitoring logic according to the voltage mutual input operation status, and monitoring the voltage mutual fuse. and issuing an early warning if the fuse is not completely blown; wherein, executing the corresponding voltage mutual fuse monitoring logic according to the voltage mutual operation status, issuing an early warning if the voltage mutual fuse is not completely blown; including: calculating the voltage mutual voltage ratio according to the voltage mutual operation status, comparing the voltage mutual voltage ratio with the upper and lower limits of the fuse early warning value, if the voltage mutual voltage ratio exceeds the upper and lower limits of the fuse early warning value, comparing the low-voltage side current of the transformer with the minimum load current, if the low-voltage side current of the transformer is less than the minimum load current, issuing an early warning signal after the set delay time to indicate that the voltage mutual fuse is not completely blown.

[0006] In one possible implementation, the status of the mutual pressure soft pressure plate on the bus is obtained, and the mutual pressure operation status on the bus is determined according to the mutual pressure voltage value and the set voltage value; including: when the bus is equipped with 2 mutual pressure soft pressure plates and both mutual pressure voltage values ​​are greater than the set voltage value, it indicates that dual mutual pressure is in operation on the bus; when the bus is equipped with 1 or 2 mutual pressure soft pressure plates and only 1 mutual pressure voltage value is greater than the set voltage value, it indicates that single mutual pressure is in operation on the bus; when the bus is equipped with 0 mutual pressure soft pressure plates, or 1 or 2 mutual pressure soft pressure plates are equipped and no mutual pressure voltage value is greater than the set voltage value, it indicates that no mutual pressure is in operation on the bus.

[0007] In one possible implementation, the mutual voltage ratio is calculated based on the mutual voltage operation status, including: when dual mutual voltages are put into operation, calculating the ratio of the two mutual voltage values ​​as the mutual voltage ratio; when a single mutual voltage is put into operation, taking the larger of the two mutual voltage values, and calculating the ratio of the larger mutual voltage value to the rated value of the secondary side of the mutual voltage as the mutual voltage ratio.

[0008] In a possible implementation, the upper limit of the fuse warning value is 1.1, and the lower limit is 0.9.

[0009] In a possible implementation, issuing a warning signal to indicate that the voltage mutual fuse is not completely blown includes: sending the warning signal to a display screen for display; and sending the warning information to an integrated automation system and a SCADA railway dispatching system.

[0010] The second aspect of the present application provides a traction power supply system voltage mutual fuse monitoring system, which is used to implement the above-mentioned traction power supply system voltage mutual fuse monitoring method. The system includes: a voltage mutual operation status analysis unit, which is used to obtain the operation status of the voltage mutual soft pressure plate on the bus, and determine the voltage mutual operation status on the bus according to the voltage mutual voltage value and the set voltage value, including: double voltage mutual operation, single voltage mutual operation and no voltage mutual operation; a voltage mutual fuse monitoring unit is used to directly issue an early warning signal to indicate that the bus has no voltage mutual operation when there is no voltage mutual operation, and when the double voltage mutual operation or the single voltage mutual operation is in operation, according to the voltage mutual operation The corresponding voltage mutual fuse monitoring logic is executed according to the operation status of the voltage mutual, and an early warning is issued if the voltage mutual fuse is not completely blown; wherein, the corresponding voltage mutual fuse monitoring logic is executed according to the operation status of the voltage mutual, and an early warning is issued if the voltage mutual fuse is not completely blown; including: calculating the voltage mutual voltage ratio according to the operation status of the voltage mutual, comparing the voltage mutual voltage ratio with the upper and lower limits of the fuse early warning value, if the voltage mutual voltage ratio exceeds the upper and lower limits of the fuse early warning value, then comparing the low-voltage side current of the transformer with the minimum load current, if the low-voltage side current of the transformer is less than the minimum load current, then issuing an early warning signal after the set delay time to indicate that the voltage mutual fuse is not completely blown.

[0011] In one possible implementation, in the voltage mutual operation status analysis unit, the operation status of the voltage mutual soft pressure plate on the bus is obtained, and the voltage mutual operation status on the bus is determined according to the voltage mutual voltage value and the set voltage value; specifically, when the bus is put into two voltage mutual soft pressure plates and both voltage mutual voltage values ​​are greater than the set voltage value, it means that the bus is double-voltage mutual in operation; when the bus is put into one or two voltage mutual soft pressure plates and only one voltage mutual voltage value is greater than the set voltage value, it means that the bus is single-voltage mutual in operation; when the bus is put into 0 voltage mutual soft pressure plates, or 1 or 2 voltage mutual soft pressure plates are put into and no voltage mutual voltage value is greater than the set voltage value, it means that there is no voltage mutual in operation on the bus.

[0012] In one possible implementation, in the voltage mutual fuse monitoring unit, the voltage mutual voltage ratio is calculated based on the voltage mutual operation status, specifically including: when dual voltage mutuals are put into operation, calculating the ratio of the two voltage mutual voltage values ​​as the voltage mutual voltage ratio; when a single voltage mutual is put into operation, taking the larger of the two voltage mutual voltage values, and calculating the ratio of the larger voltage mutual voltage value to the rated value of the secondary side of the voltage mutual as the voltage mutual voltage ratio.

[0013] In a possible implementation, in the voltage mutual fuse monitoring unit, issuing a warning signal indicates that the voltage mutual fuse is not completely blown, specifically including: sending the warning signal to a display screen for display; sending the warning information to an integrated automation system and a SCADA railway dispatching system.

[0014] According to a third aspect of the present application, a device for monitoring a voltage transformer fuse in a traction power supply system is provided, comprising: an analog quantity acquisition unit for acquiring analog quantity parameters, including: voltage and current on the high and low voltage sides of a transformer circuit breaker; a switch quantity acquisition unit for acquiring switch quantity signals, including: switch quantity signals of the high and low voltage side circuit breakers and the isolation position of the transformer circuit breaker; a microprocessor unit for receiving analog quantity parameters and switch quantity signals, executing the above-mentioned method for monitoring a voltage transformer fuse in a traction power supply system, obtaining early warning information and transmitting the early warning signal to a human-machine interface and a communication unit; a human-machine interface unit for transmitting the early warning signal to a display screen; a communication unit for converting the early warning signal via Ethernet protocol and transmitting it to an integrated automation system and a SCADA railway dispatching system; and an output unit for executing instructions of the microprocessor unit, controlling the conduction or disconnection of relevant output contacts, and controlling the opening and closing operations of internal contacts.

[0015] Compared with the prior art, the present application has the following beneficial effects: the method, system and device for monitoring voltage transformer fuses provided by the present application can automatically identify the operation status of the voltage transformer on the (27.5kV) bus, and automatically select the appropriate voltage transformer fuse monitoring logic according to the operation status of the bus voltage transformer to identify the situation where the voltage transformer fuse is not completely blown; specifically, first, according to the operation status of the soft pressure plate of the PT on the bus, the voltage transformer voltage value is compared with the set effective voltage value. If the PT soft pressure plate is in operation and the voltage transformer voltage value is greater than the effective voltage value, then Prove that this PT is put into operation; if the busbar is double-voltage mutual operation, the ratio of the two voltage mutual voltage values ​​is used to compare with the upper and lower limits of the fuse warning value K; if the busbar is single-voltage mutual operation, the ratio of the voltage mutual voltage value to the voltage mutual secondary side rated value is used to compare with the upper and lower limits of the fuse warning value K. When the ratio exceeds the upper and lower limits of the fuse warning value K, and the current Ibh on the low-voltage side of the transformer at this time is less than the minimum load current Iset, then after the set delay time Tset, a warning signal is issued to indicate that the voltage mutual fuse is not completely blown. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 A schematic diagram of the main wiring of a traction substation provided in an embodiment of the present application; Figure 2 A flow chart of a method for monitoring voltage mutual fuses in a traction power supply system provided in an embodiment of the present application; Figure 3 A logic diagram for identifying the operation status of the T-phase busbar voltage mutual input provided in an embodiment of the present application; Figure 4 A monitoring logic diagram of a busbar voltage mutual fuse provided in an embodiment of the present application; Figure 5 A structural diagram of a voltage mutual fuse monitoring system for a traction power supply system provided in an embodiment of the present application; Figure 6 Schematic diagram of a voltage transformer fuse monitoring device for a traction power supply system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] Hereinafter, the terms "include" or "may include" as used in various embodiments of the present application indicate the presence of the claimed function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present application, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing or the possibility of adding one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0018] The terms used in the various embodiments of the present application are only used for the purpose of describing specific embodiments and are not intended to limit the various embodiments of the present application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise specified, all terms used herein (including technical terms and scientific terms) have the same meaning as those generally understood by those skilled in the art to which the various embodiments of the present application belong. Terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the present application.

[0019] In order to make the objectives, technical solutions and advantages of this application more clear, the present application is further described in detail below in conjunction with examples and drawings. The schematic implementation methods of this application and their descriptions are only used to explain this application and are not intended to limit this application.

[0020] First, in order to enable those skilled in the art to fully understand the technical content of this application, a schematic diagram of the main wiring of a traction substation is provided. Figure 1 As shown, Figure 1 Schematic diagram of the main wiring of a traction substation provided in an embodiment of the present application. Figure 1The demonstration shows how the incoming power from lines 1# and 2# (110kV or 220kV) is transformed and transmitted to the 27.5kV busbars A and B via traction transformers (1#B or 2#B), disconnectors (1QS, 2QS, 3QS, 4QS, 5QS, 6QS), and circuit breakers (1QF, 2QF, 3QF, 4QF, 5QF, 6QF). Voltage transformers (VTS, such as 1PT, 2PT, 3PT, and 4PT) are connected to the A and B busbars via fuses (1RD, 2RD, 3RD, and 4RD) for voltage measurement and protection.

[0021] See Figure 2 As shown, Figure 2 Flowchart of a method for monitoring voltage mutual fuses in a traction power supply system provided in an embodiment of the present application. The method includes: obtaining the input status of the busbar mutual pressure plate, and determining the mutual input operation status of the busbar according to the mutual voltage value and the set voltage value, including: double mutual input operation, single mutual input operation and no mutual voltage input operation; when no mutual voltage is in operation, directly issuing an early warning signal to indicate that the busbar has no mutual voltage in operation; when double mutual voltage is in operation or single mutual voltage is in operation, executing the corresponding mutual voltage fuse monitoring logic according to the mutual input operation status, and issuing an early warning if the mutual voltage fuse is not completely blown; wherein, executing the corresponding mutual voltage fuse monitoring logic according to the mutual input operation status, and issuing an early warning if the mutual voltage fuse is not completely blown; including: calculating the mutual voltage ratio according to the mutual voltage operation status, comparing the mutual voltage ratio with the upper and lower limits of the fuse early warning value, if the mutual voltage ratio exceeds the upper and lower limits of the fuse early warning value, then comparing the low-voltage side current of the transformer with the minimum load current, if the low-voltage side current of the transformer is less than the minimum load current, then issuing an early warning signal after a set delay time to indicate that the mutual voltage fuse is not completely blown.

[0022] Specifically, the system first determines the operational status of the transformers (PTs) on the 27.5kV busbar on the traction substation. If both PTs are active and live, the system uses a dual-PT monitoring logic. If only one PT is active and live, the system uses a single-PT monitoring logic. If neither PT is active and live, the system issues an early warning signal, indicating that no PTs are operating on the busbar. If the system uses dual PTs (two PTs acting as backup), the PT voltage ratio is calculated using the voltage values ​​of the two PTs. If the system uses a single PT, the PT voltage ratio is calculated using the PT voltage and the PT secondary rating. If the PT voltage ratio is within the upper and lower limits of the fuse warning value K, the two PTs are operating normally. If it exceeds these limits, the two PTs are operating abnormally, and the PT fuse may not have fully blown. In order to prevent false alarms caused by vehicles or faults on the line, further determine the transformer low-voltage side current I bh Is it less than the minimum load current I set Within the range, only when the transformer low voltage side current I bh When the load current is lower than the minimum load current, after continuous monitoring for the set delay time, an early warning signal is issued to indicate that the voltage mutual fuse is not completely blown (not completely disconnected).

[0023] The improvement of the present application lies in automatically identifying the operating conditions of the voltage transformer of the substation according to the power supply characteristics of the traction substation, and automatically selecting the monitoring method of the voltage transformer fuse according to the conditions of single-voltage mutual operation and double-voltage mutual operation, so as to realize early warning of incomplete melting; it can effectively solve the problem that the integrated automation system of the traction power supply system cannot issue a timely early warning when the voltage transformer fuse is not completely melted, thereby avoiding the possible false tripping of the protection caused by the passage of a locomotive in the power supply section, and ensuring the safe and reliable operation of the traction power supply system and railway driving.

[0024] See Figure 3 As shown, Figure 3 A logic diagram for identifying the operation status of the T-phase busbar voltage mutual operation provided in an embodiment of the present application. In one possible implementation, the operation status of the voltage mutual soft pressure plate on the busbar is obtained, and the voltage mutual operation status on the busbar is determined according to the voltage mutual voltage value and the set voltage value; including: when the busbar is put into two voltage mutual soft pressure plates and both voltage mutual voltage values ​​are greater than the set voltage value, it indicates that the busbar is double-voltage-connected; when the busbar is put into one or two voltage mutual soft pressure plates and only one voltage mutual voltage value is greater than the set voltage value, it indicates that the busbar is single-voltage-connected; when the busbar is put into zero voltage mutual soft pressure plates, or one or two voltage mutual soft pressure plates are put into use and no voltage mutual voltage value is greater than the set voltage value, it indicates that the busbar is not voltage-connected.

[0025] Specifically, take the voltage of busbar phase a of traction substation as an example, and the voltage of busbar phase b is the same. Put the soft pressure plates of busbar phase a 1PT and 2PT into operation, and collect the voltage value U of busbar phase a 1PT and 2PT. a1 、U a2 , and the transformer low-voltage side current I bh . The analog signal U a1 、U a2 , I bh Converted into digital signal, if the mutual voltage value U a1 、U a2 Both are greater than the set voltage value U 有压 (U 有压 =70V), the a-phase busbar is operating with dual voltage mutual input. If only one PT soft pressure plate is engaged and the voltage mutual voltage is greater than the set voltage value, or if two PT soft pressure plates are engaged and only one voltage mutual voltage is greater than the set voltage value, the a-phase busbar is operating with single voltage mutual input. If no PT soft pressure plates are engaged, or one PT soft pressure plate is engaged and no voltage mutual voltage is greater than the set voltage value, or if two PT soft pressure plates are engaged and no voltage mutual voltage is greater than the set voltage value, the a-phase busbar is operating with no voltage mutual input.

[0026] See Figure 4 As shown, Figure 4 A monitoring logic diagram for a busbar voltage mutual fuse provided in an embodiment of the present application. In one possible implementation, calculating a voltage mutual voltage ratio based on the voltage mutual operation status includes: when dual voltage mutuals are in operation, calculating the ratio of the two voltage mutual voltages as the voltage mutual voltage ratio; when a single voltage mutual is in operation, taking the larger of the two voltage mutual voltages and calculating the ratio of the larger voltage mutual voltage to the rated value of the secondary side of the voltage mutual as the voltage mutual voltage ratio.

[0027] Specifically, the voltage mutual of the busbar of phase a of the traction substation is used as an example for explanation. The voltage mutual of phase b is the same. When the dual voltage mutual is put into operation, the voltage mutual voltage value U of the two PTs is calculated. a1 、U a2 The ratio of the voltage (as the mutual voltage ratio) is compared with the upper and lower limits of the fuse warning value K. If it is within this range, it means that the two PTs are operating normally; if it exceeds the upper and lower limits of the warning value K, it is further judged that the transformer low-voltage side current I bh Is the current less than the minimum load current I set If it is less than the minimum load current, then after the set delay time T set After that, a warning signal is issued indicating that the voltage transformer fuse is not completely blown. When a single voltage transformer is put into operation, take the two voltage transformer voltage values ​​U a1、U a2 The larger mutual voltage value and calculate its difference with the mutual secondary rated value U e The ratio of the voltage to each other (as the voltage ratio), the voltage to each other voltage ratio is compared with the upper and lower limits of the fuse warning value K. If it exceeds the upper and lower limits of the warning value K, and the transformer low-voltage side current I bh Less than the minimum load current I set , then after the set delay time T set After that, a warning signal is issued, indicating that the voltage mutual fuse is not completely blown.

[0028] In a possible implementation, the upper limit of the fuse warning value is 1.1, and the lower limit is 0.9.

[0029] Specifically, the lower limit of the fuse warning value K is 0.9, and the upper limit is 1.1.

[0030] In a possible implementation, issuing a warning signal to indicate that the voltage mutual fuse is not completely blown includes: sending the warning signal to a display screen for display; and sending the warning information to an integrated automation system and a SCADA railway dispatching system.

[0031] Specifically, the early warning signal can be sent to the display screen and displayed in the form of a warning light or text to remind the on-site personnel of the traction substation to understand the situation in a timely manner; further, the early warning signal that the voltage mutual fuse has not been completely blown is transmitted to the background of the integrated automation system and the SCADA railway dispatching system to remind the operating unit to carry out timely maintenance.

[0032] It can be understood that the present application provides a method for monitoring voltage transformer fuses, which can automatically identify the operation status of the voltage transformer on the (27.5kV) bus, and automatically select the appropriate voltage transformer fuse monitoring logic according to the operation status of the bus voltage transformer to identify the situation where the voltage transformer fuse is not completely blown. Specifically, the voltage transformer voltage value is first compared with the set effective voltage value according to the operation status of the soft pressure plate of the PT on the bus. If the PT soft pressure plate is in operation and the voltage transformer voltage value is greater than the effective voltage value, it proves that this PT is in operation; if the bus is double-voltage transformer in operation, the ratio of the two voltage transformer voltage values ​​is used to compare with the upper and lower limits of the fuse warning value K; if the bus is single-voltage transformer in operation, the ratio of the voltage transformer voltage value to the voltage transformer secondary side rated value is used to compare with the upper and lower limits of the fuse warning value K. When the ratio exceeds the upper and lower limits of the fuse warning value K, and the current I on the low-voltage side of the transformer at this time bh Less than the minimum load current I set , then the set delay time T set After that, a warning signal is issued, indicating that the voltage mutual fuse is not completely blown.

[0033] See Figure 5As shown, Figure 5 This is a structural diagram of the voltage mutual fuse monitoring system for the traction power supply system provided in the embodiment of the present application. The device is used to implement the above-mentioned voltage mutual fuse monitoring method for the traction power supply system, and the system includes: a voltage mutual operation status analysis unit, which is used to obtain the operation status of the voltage mutual soft pressure plate on the bus, and determine the voltage mutual operation status on the bus according to the voltage mutual voltage value and the set voltage value, including: double voltage mutual operation, single voltage mutual operation and no voltage mutual operation; a voltage mutual fuse monitoring unit, which is used to directly issue an early warning signal to indicate that the bus has no voltage mutual operation when there is no voltage mutual operation, and to execute the corresponding voltage according to the voltage mutual operation status when the double voltage mutual operation or the single voltage mutual operation is in operation. The mutual fuse monitoring logic issues an early warning if the voltage mutual fuse is not completely blown; wherein, the corresponding voltage mutual fuse monitoring logic is executed according to the voltage mutual operation status, and an early warning is issued if the voltage mutual fuse is not completely blown; including: calculating the voltage mutual voltage ratio according to the voltage mutual operation status, comparing the voltage mutual voltage ratio with the upper and lower limits of the fuse early warning value, if the voltage mutual voltage ratio exceeds the upper and lower limits of the fuse early warning value, then comparing the low-voltage side current of the transformer with the minimum load current, if the low-voltage side current of the transformer is less than the minimum load current, then issuing an early warning signal after the set delay time to indicate that the voltage mutual fuse is not completely blown.

[0034] In one possible implementation, in the voltage mutual operation status analysis unit, the operation status of the voltage mutual soft pressure plate on the bus is obtained, and the voltage mutual operation status on the bus is determined according to the voltage mutual voltage value and the set voltage value; specifically, when the bus is put into two voltage mutual soft pressure plates and both voltage mutual voltage values ​​are greater than the set voltage value, it means that the bus is double-voltage mutual in operation; when the bus is put into one or two voltage mutual soft pressure plates and only one voltage mutual voltage value is greater than the set voltage value, it means that the bus is single-voltage mutual in operation; when the bus is put into 0 voltage mutual soft pressure plates, or 1 or 2 voltage mutual soft pressure plates are put into and no voltage mutual voltage value is greater than the set voltage value, it means that there is no voltage mutual in operation on the bus.

[0035] In one possible implementation, in the voltage mutual fuse monitoring unit, the voltage mutual voltage ratio is calculated based on the voltage mutual operation status, specifically including: when dual voltage mutuals are put into operation, calculating the ratio of the two voltage mutual voltage values ​​as the voltage mutual voltage ratio; when a single voltage mutual is put into operation, taking the larger of the two voltage mutual voltage values, and calculating the ratio of the larger voltage mutual voltage value to the rated value of the secondary side of the voltage mutual as the voltage mutual voltage ratio.

[0036] In a possible implementation, in the voltage mutual fuse monitoring unit, the upper limit of the fuse warning value is 1.1, and the lower limit is 0.9.

[0037] In a possible implementation, in the voltage mutual fuse monitoring unit, issuing a warning signal indicates that the voltage mutual fuse is not completely blown, specifically including: sending the warning signal to a display screen for display; sending the warning information to an integrated automation system and a SCADA railway dispatching system.

[0038] It can be understood that the traction power supply system voltage mutual fuse monitoring system provided in this application is used to implement the traction power supply system voltage mutual fuse monitoring method, corresponds one-to-one to the method, and has corresponding technical effects, so it will not be elaborated on.

[0039] See Figure 6 As shown, Figure 6 Schematic diagram of a traction power supply system voltage transformer fuse monitoring device provided in an embodiment of the present application. The device includes: an analog quantity acquisition unit for acquiring analog quantity parameters, including: voltage and current on the high and low voltage sides of the transformer circuit breaker; a switch quantity acquisition unit for acquiring switch quantity signals, including: switch quantity signals of the high and low voltage side circuit breakers and the isolation position of the transformer circuit breaker; a microprocessor unit for receiving analog quantity parameters and switch quantity signals, executing the above-mentioned traction power supply system voltage transformer fuse monitoring method, obtaining early warning information and transmitting the early warning signal to the human-machine interface and communication unit; the human-machine interface unit for transmitting the early warning signal to the display screen; the communication unit for converting the early warning signal via Ethernet protocol and sending it to the integrated automation system and SCADA railway dispatching system; and an output unit for executing the instructions of the microprocessor unit, controlling the conduction or disconnection of relevant output contacts, and controlling the opening and closing operations of internal contacts.

[0040] Specifically, the analog acquisition unit is used to collect analog parameters such as voltage and current on the high and low voltage sides of the traction transformer circuit breaker. The digital acquisition unit is used to collect signals from the high and low voltage sides of the traction transformer circuit breaker, disconnect position signals, and other external digital signals. The microprocessor unit, which can be composed of a Xilink Zynq-7000 series chip and its peripheral circuits, possesses excellent data parallel processing capabilities and can process the collected analog parameters and digital signals in real time. It also executes the aforementioned voltage transformer fuse monitoring method to generate warning information and transmit this information to the human interface and communication unit. The human-machine interface can include a 3.8-inch COG 320×240 pixel LCD display and six buttons: up, down, left, right, confirm, and cancel. This allows on-site personnel to view device self-test information and warning signals in real time. Optionally, they can also view the voltage transformer voltage and the transformer low-voltage side current. The communication unit converts warning signals indicating a partially blown voltage transformer fuse into Ethernet protocol and transmits them to the integrated automation system and the SCADA railway dispatching system, alerting operators to timely repairs. Furthermore, the system can also include a switching unit, which executes instructions from the microprocessor unit, controls the opening and closing of related switching contacts, and controls the device's internal opening and closing operations through an external operating circuit.

[0041] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for monitoring voltage mutual fuses in a traction power supply system, characterized in that: include: Obtain the input status of the busbar mutual pressure soft plate, and determine the operation status of the busbar mutual pressure according to the mutual pressure voltage value and the set voltage value, including: double mutual pressure operation, single mutual pressure operation and no mutual pressure operation; When no mutual voltage is put into operation, a warning signal is directly issued to indicate that no busbar mutual voltage is put into operation. When dual-voltage mutual voltage is put into operation or single-voltage mutual voltage is put into operation, the corresponding mutual voltage fuse monitoring logic is executed according to the mutual voltage operation status, and a warning is issued if the mutual voltage fuse is not completely blown; Among them, the corresponding voltage mutual fuse monitoring logic is executed according to the voltage mutual operation status, and an early warning is issued if the voltage mutual fuse is not completely blown; including: calculating the voltage mutual voltage ratio according to the voltage mutual operation status, comparing the voltage mutual voltage ratio with the upper and lower limits of the fuse early warning value, if the voltage mutual voltage ratio exceeds the upper and lower limits of the fuse early warning value, then comparing the low-voltage side current of the transformer with the minimum load current, if the low-voltage side current of the transformer is less than the minimum load current, then after the set delay time, an early warning signal is issued to indicate that the voltage mutual fuse is not completely blown.

2. A method for monitoring voltage mutual fuses in a traction power supply system according to claim 1, characterized in that: Obtain the input status of the busbar pressure mutual soft pressure plate, and determine the operation status of the busbar pressure mutual input according to the pressure mutual voltage value and the set pressure voltage value; including: When two mutual pressure plates are connected to the busbar and the voltage values ​​of the two mutual pressure plates are both greater than the set voltage value, it means that the dual mutual pressure plates on the busbar are in operation. When one or two busbar pressure mutual soft pressure plates are put into operation and only one pressure mutual voltage value is greater than the set pressure voltage value, it means that the single pressure mutual on the busbar is put into operation; When there are 0 mutual pressure plates on the bus, or 1 or 2 mutual pressure plates are put into operation and no mutual pressure value is greater than the set voltage value, it means that no mutual pressure is put into operation on the bus.

3. The method for monitoring voltage mutual fuses in a traction power supply system according to claim 1, characterized in that: Calculate the voltage ratio of the voltage transformer according to the voltage transformer operation status, including: When the dual voltage mutual is put into operation, the ratio of the two voltage mutual voltage values ​​is calculated as the voltage mutual voltage ratio; When a single transformer is put into operation, take the larger of the two transformer voltage values ​​and calculate the ratio of the larger transformer voltage value to the transformer secondary side rated value as the transformer voltage ratio.

4. The method for monitoring voltage mutual fuses in a traction power supply system according to claim 1, characterized in that: The upper limit of the fuse warning value is 1.1, and the lower limit is 0.

9.

5. The method for monitoring voltage mutual fuses in a traction power supply system according to claim 1, characterized in that: The warning signal indicates that the voltage mutual fuse has not completely blown, including: Sending the warning signal to a display screen for display; The warning information is sent to the integrated automation system and the SCADA railway dispatching system.

6. A traction power supply system voltage mutual fuse monitoring system, characterized in that: A method for monitoring a voltage mutual fuse in a traction power supply system according to any one of claims 1 to 5 is implemented; the system comprises: The voltage mutual operation status analysis unit is used to obtain the operation status of the voltage mutual soft pressure plate on the busbar, and determine the voltage mutual operation status on the busbar according to the voltage mutual voltage value and the set voltage value, including: double voltage mutual operation, single voltage mutual operation and no voltage mutual operation; The voltage mutual fuse monitoring unit is used to directly issue a warning signal indicating that the busbar has no mutual voltage in operation when no mutual voltage is put into operation. When dual voltage mutuals are put into operation or single voltage mutuals are put into operation, the corresponding voltage mutual fuse monitoring logic is executed according to the voltage mutual operation status, and a warning is issued if the voltage mutual fuse is not completely blown; wherein, the corresponding voltage mutual fuse monitoring logic is executed according to the voltage mutual operation status, and a warning is issued if the voltage mutual fuse is not completely blown; including: calculating the voltage mutual voltage ratio according to the voltage mutual operation status, comparing the voltage mutual voltage ratio with the upper and lower limits of the fuse warning value, if the voltage mutual voltage ratio exceeds the upper and lower limits of the fuse warning value, then comparing the low-voltage side current of the transformer with the minimum load current, if the low-voltage side current of the transformer is less than the minimum load current, then issuing a warning signal after the set delay time to indicate that the voltage mutual fuse is not completely blown.

7. A traction power supply system voltage mutual fuse monitoring system according to claim 6, characterized in that: In the voltage-coupled operation status analysis unit, the operation status of the voltage-coupled soft pressure plate on the busbar is obtained, and the voltage-coupled operation status on the busbar is determined based on the voltage-coupled voltage value and the set voltage value. Specifically, the following steps are performed: When two mutual pressure plates are connected to the busbar and the voltage values ​​of the two mutual pressure plates are both greater than the set voltage value, it means that the dual mutual pressure plates on the busbar are in operation. When one or two busbar pressure mutual soft pressure plates are put into operation and only one pressure mutual voltage value is greater than the set pressure voltage value, it means that the single pressure mutual on the busbar is put into operation; When there are 0 mutual pressure plates on the bus, or 1 or 2 mutual pressure plates are put into operation and no mutual pressure value is greater than the set voltage value, it means that no mutual pressure is put into operation on the bus.

8. The traction power supply system voltage mutual fuse monitoring system according to claim 6, characterized in that: In the voltage mutual fuse monitoring unit, the voltage mutual voltage ratio is calculated according to the voltage mutual operation status, specifically including: When the dual voltage mutual is put into operation, the ratio of the two voltage mutual voltage values ​​is calculated as the voltage mutual voltage ratio; When a single transformer is put into operation, take the larger of the two transformer voltage values ​​and calculate the ratio of the larger transformer voltage value to the transformer secondary side rated value as the transformer voltage ratio.

9. A traction power supply system voltage mutual fuse monitoring system according to claim 6, characterized in that: In the voltage mutual fuse monitoring unit, issuing an early warning signal indicates that the voltage mutual fuse is not completely blown, specifically including: sending the early warning signal to a display screen for display; sending the early warning information to an integrated automation system and a SCADA railway dispatching system.

10. A voltage mutual fuse monitoring device for a traction power supply system, characterized in that: include: Analog quantity acquisition unit, used to collect analog quantity parameters, including: voltage and current on the high and low voltage sides of the transformer circuit breaker; The switch quantity acquisition unit is used to collect switch quantity signals, including: switch quantity signals of the high and low voltage side circuit breakers and the isolation position of the transformer circuit breaker; a microprocessor unit, configured to receive analog parameters and switch signals, execute a method for monitoring a voltage mutual fuse in a traction power supply system according to any one of claims 1 to 5, obtain warning information, and transmit the warning signal to a human-machine interface and a communication unit; A human-machine interface unit, used to transmit the warning signal to the display screen; Communication unit, used to convert the warning signal into Ethernet protocol and send it to the integrated automation system and SCADA railway dispatching system; The output unit is used to execute the instructions of the microprocessor unit, control the conduction or disconnection of the relevant output contacts, and control the opening and closing operations of the internal contacts.

Images