Vehicle-mounted traction transformer gas protection method, system, equipment and medium

Abstract

The invention relates to the field of vehicle-mounted transformers, and provides a vehicle-mounted traction transformer gas protection method, system, equipment and medium, and the method comprises the steps: monitoring the pressure and temperature of transformer oil in a transformer, and obtaining the state of a pressure relief valve; in response to the abnormal internal pressure, when the pressure relief valve triggers the protection action, a main circuit breaker tripping signal is generated, and the whole vehicle stops running; when the internal pressure is normal and the pressure relief valve does not trigger the protection action, the protection action is triggered according to the gas relay protection signal, and gas delay protection is carried out; and responding to temperature abnormity, starting temperature alarm, checking the state of the gas relay, and controlling the vehicle to run. According to the method, through reasonable cooperation of gas protection hardware parameter setting and protection logic, on the premise that internal faults of the transformer are quickly responded and isolated, and vehicle application safety is guaranteed, the reliability and application vitality of the whole vehicle and the traction transformer are further improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted transformers, and in particular to a vehicle-mounted traction transformer gas protection method, system, equipment and medium. Background Art

[0002] Transformers are the core equipment for power transmission. They use the principle of electromagnetic induction to change the AC voltage to transmit electric energy. The rail vehicle traction transformer is a mobile single-phase transformer installed on a rail vehicle, usually installed under the vehicle in the middle of the vehicle.

[0003] As a transformer protection device, the gas relay was first used on ground-stationary power transformers. Its protection principle is: when a minor or low-energy fault occurs inside the transformer, the transformer oil will slightly decompose to produce a small amount of gas, which will gather in the gas relay along the transformer oil expansion circuit. When the gas volume exceeds the set value, the first-level protection (light gas) will be activated and an alarm signal will be issued; when a serious or high-energy fault occurs inside the transformer, a large amount of heat will be generated at the faulty part, causing the oil to crack severely and produce a large amount of gas. The expansion of oil and gas will cause the inside of the transformer to rise, and the top transformer oil will quickly surge into the oil storage cabinet in the oil expansion circuit. When the flow rate of the expanding oil exceeds the limit, the second-level protection (heavy gas) will be activated, a trip signal will be issued, and the power supply will be cut off to prevent the fault from further developing.

[0004] With the development and application of electrified rail vehicles, gas relays have begun to be used on some on-board traction transformers. Since rail vehicles are high-speed mobile equipment, the equipment they carry is always working under impact and vibration conditions during operation. Under the conditions of vehicle acceleration, braking, and passing curves, a large oil flow will be generated inside the on-board transformer, causing the gas relay to have secondary protection (heavy gas) action, thereby affecting the normal operation of the vehicle.

[0005] The existing technology for preventing the misoperation of the secondary protection of the gas relay of the ground stationary transformer is generally to reduce false alarms by associating the secondary protection of the gas relay with gas changes, oil temperature protection, busbar protection, etc. A method of adding a gas composition analysis device and a gas (Buch) relay for comprehensive judgment and protection has emerged in the rail vehicle transformer to improve the safety of the vehicle operation.

[0006] However, when the secondary protection of the on-board transformer of a rail vehicle malfunctions, the above technology cannot quickly and clearly determine whether it is caused by a fault inside the transformer or a surge in oil flow inside the on-board transformer caused by a sudden change in vehicle speed, and cannot meet the safety needs of real-time response to faults when the vehicle is running on the line.

[0007] To sum up, with the application of gas protection methods for ground transformers in some on-board transformers, through years of use, it can be seen that the reliability of its protection function has a lot of room for improvement. As rail vehicles continue to increase the reliability requirements of on-board mobile equipment, the existing gas protection technology will not be able to meet the requirements. Summary of the invention

[0008] Based on the above purpose, the present invention proposes a vehicle-mounted traction transformer gas protection method, comprising: Monitor the pressure and temperature of the transformer oil inside the transformer and obtain the status of the pressure relief valve; In response to abnormal internal pressure and when the pressure relief valve triggers a protection action, a main circuit breaker trip signal is generated and the vehicle stops running; In response to the internal pressure being normal and the pressure relief valve not triggering a protection action, triggering a protection action according to the gas relay protection signal to perform gas delay protection; In response to temperature abnormalities, the temperature alarm is activated, the status of the gas relay is checked, and the vehicle operation is controlled.

[0009] In some embodiments, the steps of triggering a protection action according to the gas relay protection signal and performing gas delay protection include: In response to the gas relay only having the first level protection action, the first level protection time does not meet the first delay setting value, the vehicle microcomputer sends a gas alarm signal, and the whole vehicle maintains operation.

[0010] In some embodiments, the step of triggering a protection action according to the gas relay protection signal and performing gas delay protection further includes: In response to the gas relay only having the secondary protection action, the secondary protection time does not meet the second delay setting value, the vehicle microcomputer sends a gas alarm signal, and the whole vehicle maintains operation.

[0011] In some embodiments, the secondary protection flow rate limit of the gas relay is set to 1.5 m / s.

[0012] In some embodiments, the step of triggering a protection action according to the gas relay protection signal and performing gas delay protection further includes: In response to the gas relay simultaneously performing the primary protection action and the secondary protection action, and satisfying the first delay setting value and the second delay setting value respectively, the vehicle microcomputer sends a main circuit breaker tripping signal, and the entire vehicle stops running.

[0013] In some embodiments, in response to temperature abnormality, the steps of activating a temperature alarm, checking the status of a gas relay, and controlling vehicle operation include: In response to the temperature of the transformer oil exceeding the first temperature but being lower than the second temperature, and the gas relay not performing the primary protection action or the secondary protection action, the vehicle microcomputer sends a power reduction signal, and the entire vehicle maintains operation.

[0014] In some embodiments, in response to temperature abnormality, the steps of activating a temperature alarm, checking the status of a gas relay, and controlling vehicle operation include: In response to the transformer oil temperature exceeding the first temperature but lower than the second temperature and the gas relay generating a primary protection action or a secondary protection action, or the transformer oil temperature exceeding the second temperature, the vehicle microcomputer sends a main circuit breaker tripping signal and the entire vehicle stops running.

[0015] The present invention proposes a vehicle-mounted traction transformer gas protection system, comprising: A monitoring module configured to monitor the pressure and temperature of transformer oil inside the transformer and obtain a status of a pressure relief valve; A pressure association module is configured to generate a main circuit breaker trip signal in response to an abnormal internal pressure and when the pressure relief valve triggers a protection action, the whole vehicle stops running; A delay module is configured to trigger a protection action according to the gas relay protection signal to perform gas delay protection in response to the internal pressure being normal and the pressure relief valve not triggering a protection action; The temperature association module is configured to start a temperature alarm, check the state of the gas relay, and control the operation of the vehicle in response to abnormal temperature.

[0016] The present invention provides a computer device, comprising: At least one processor; and a memory, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the program, the steps of the on-board traction transformer gas protection method are performed.

[0017] The present invention proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the on-board traction transformer gas protection method are executed.

[0018] The present invention has at least the following beneficial technical effects: The present invention proposes a vehicle-mounted traction transformer gas protection method, system, equipment and medium, the method comprising: monitoring the pressure and temperature of the transformer oil inside the transformer, and obtaining the state of the pressure relief valve; in response to abnormal internal pressure, when the pressure relief valve triggers a protection action, generating a main circuit breaker trip signal, and stopping the whole vehicle; in response to normal internal pressure, when the pressure relief valve does not trigger a protection action, triggering a protection action according to the gas relay protection signal, and performing gas delayed protection; in response to abnormal temperature, starting a temperature alarm, checking the state of the gas relay, and controlling the vehicle operation.

[0019] The present invention coordinates reasonable gas protection hardware parameter settings and protection logic to quickly respond to and isolate internal transformer faults, ensuring vehicle operation safety as a prerequisite, while solving the problem of gas protection malfunction caused by the impact and vibration environment of rail vehicles, further improving the reliability and service life of the entire vehicle and traction transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A flow chart of a vehicle-mounted traction transformer gas protection method provided by the present invention; Figure 2 A module diagram of a vehicle-mounted traction transformer gas protection system provided by the present invention; Figure 3 A gas delay protection logic diagram of an embodiment of a vehicle-mounted traction transformer gas protection method provided by the present invention; Figure 4 A schematic diagram of the structure of an embodiment of a computer device provided by the present invention; Figure 5 A schematic diagram of the structure of an embodiment of a computer-readable storage medium provided by the present invention. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0023] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0024] The present invention proposes a gas protection method for vehicle-mounted traction transformers. Figure 1 ,include: S1: monitors the pressure and temperature of the transformer oil inside the transformer and obtains the status of the pressure relief valve; S2: In response to abnormal internal pressure and when the pressure relief valve triggers protection action, a main circuit breaker trip signal is generated and the vehicle stops running; S3: In response to the internal pressure being normal and the pressure relief valve not triggering the protection action, triggering the protection action according to the gas relay protection signal to perform gas delay protection; S4: In response to temperature abnormality, activate the temperature alarm, check the status of the gas relay, and control the vehicle operation.

[0025] The present invention coordinates reasonable gas protection hardware parameter settings and protection logic to quickly respond to and isolate internal transformer faults, ensuring vehicle operation safety as a prerequisite, while solving the problem of gas protection malfunction caused by the impact and vibration environment of rail vehicles, further improving the reliability and service life of the entire vehicle and traction transformer.

[0026] The gas relay can respond quickly to transformer faults, such as arcing, overcurrent and other abnormal conditions, and immediately cut off the circuit, which helps prevent the fault from further expanding, thereby effectively protecting the transformer from further damage and ensuring the safety of train operation.

[0027] In some embodiments, see Figure 1 and Figure 3 The steps of triggering the protection action according to the gas relay protection signal and performing the gas delay protection include: In response to the gas relay only having the first level protection action, the first level protection time does not meet the first delay setting value, the vehicle microcomputer sends a gas alarm signal, and the whole vehicle maintains operation.

[0028] The first delay setting value is 30s. The system can immediately send out an alarm signal to remind the operator to pay attention to the operating status of the transformer, which helps the operator to detect and deal with potential faults in time, thereby avoiding further expansion of the fault and ensuring the safety of train operation.

[0029] If the system is too sensitive, protection actions may be frequently triggered in the event of a minor fault or normal fluctuation, resulting in unnecessary shutdown or equipment damage. By setting the delay set value, false actions caused by minor faults or normal fluctuations can be reduced to a certain extent, improving the stability and reliability of the system.

[0030] Even if there is a minor fault or abnormality in the transformer, the train may still maintain safe operation. If the system immediately triggers the protection action and stops the train, it will affect the normal operation of the entire railway network. By allowing the system to continue to operate for a period of time after the alarm, the train can continue to run without affecting safety, thereby ensuring the continuity of train operation.

[0031] In some embodiments, see Figure 1 and Figure 3 The step of triggering a protection action according to the gas relay protection signal and performing gas delay protection also includes: In response to the gas relay only having the secondary protection action, the secondary protection time does not meet the second delay setting value, the vehicle microcomputer sends a gas alarm signal, and the whole vehicle maintains operation.

[0032] The second delay setting value is 10s. Slight abnormal gas concentration or pressure fluctuation may not be enough to trigger the first-level protection action, but it is enough to attract the attention of the operator. At this time, if the system immediately triggers the protection action and stops the vehicle operation, it may cause unnecessary parking and delays. By setting the second-level protection action and the second delay setting value, false actions can be avoided and the safety of vehicle operation can be ensured.

[0033] After the secondary protection action is triggered, if the fault is not particularly serious, the entire train will continue to operate. This helps ensure that the train can continue to perform its mission without affecting safety and avoid stops and delays caused by minor faults.

[0034] In some embodiments, see Figure 1 and Figure 3 , set the secondary protection flow rate limit of the gas relay to 1.5m / s.

[0035] Increasing the flow rate limit to 1.5m / s means that the gas relay will trigger protection only when it detects a higher flow rate. For some minor faults or anomalies, the flow rate may not reach the new limit, so the protection action will not be triggered, avoiding unnecessary parking and maintenance. However, for more serious faults, such as a short circuit or severe leakage inside the transformer, the flow rate will increase rapidly and exceed the new limit, thus triggering the protection action, improving the response sensitivity of the gas relay to serious faults.

[0036] In some embodiments, see Figure 1 and Figure 3The step of triggering a protection action according to the gas relay protection signal and performing gas delay protection also includes: In response to the gas relay simultaneously performing the primary protection action and the secondary protection action, and satisfying the first delay setting value and the second delay setting value respectively, the vehicle microcomputer sends a main circuit breaker tripping signal, and the entire vehicle stops running.

[0037] When the gas relay triggers the primary and secondary protection actions at the same time and meets the corresponding delay setting value, the vehicle microcomputer immediately sends a signal to trip the main circuit breaker and quickly cuts off the power supply, which helps prevent the expansion of the fault, avoids possible serious accidents such as short circuits and fires, and ensures driving safety. Timely power-off protection prevents transformers and other equipment from continuing to operate in a faulty state, reduces equipment damage caused by overheating, overcurrent, etc., and reduces maintenance costs.

[0038] The simultaneous triggering of primary and secondary protection actions and meeting the requirements of the delay setting value provide operators with clear fault indications, helping them to quickly locate the fault point.

[0039] In some embodiments, see Figure 1 , in response to temperature abnormality, activating a temperature alarm, checking the state of a gas relay, and controlling the operation of the vehicle include: In response to the temperature of the transformer oil being lower than the first temperature T1 and the gas relay not having a primary protection action or a secondary protection action, the entire vehicle operates normally.

[0040] Among them, T1 represents the threshold value of 89°C. At this time, the equipment temperature is normal and the entire vehicle operates normally.

[0041] In some embodiments, see Figure 1 , in response to temperature abnormality, activating a temperature alarm, checking the state of a gas relay, and controlling the operation of the vehicle include: In response to the transformer oil temperature exceeding the first temperature T1 but being lower than the second temperature T2 and the gas relay not undergoing primary protection action or secondary protection action, the vehicle microcomputer sends a power reduction signal and the entire vehicle maintains operation.

[0042] When the temperature of the transformer oil exceeds the first temperature T1 threshold of 89°C but is lower than the second temperature T2 threshold of 106°C, it indicates that the equipment may be in an overheated state, but has not yet reached the level of triggering the gas relay protection action. At this time, by issuing a power reduction signal, the train's operating power is reduced, the heat load of the equipment is reduced, and possible serious failures are prevented. Power reduction operation helps reduce the thermal stress of key equipment such as transformers, extend their service life, and reduce the risk of equipment damage due to overheating.

[0043] When the temperature is abnormal but the gas relay protection has not yet been triggered, the train can be operated at reduced power instead of stopping immediately, thus reducing the number of stops due to minor faults, improving the operating efficiency of the train, reducing train delays caused by faults, and improving the punctuality of the train.

[0044] In some embodiments, see Figure 1 , in response to temperature abnormality, activating a temperature alarm, checking the state of a gas relay, and controlling the operation of the vehicle include: In response to the transformer oil temperature exceeding the first temperature but lower than the second temperature and the gas relay generating a primary protection action or a secondary protection action, or the transformer oil temperature exceeding the second temperature, the vehicle microcomputer sends a main circuit breaker tripping signal and the entire vehicle stops running.

[0045] When the temperature of the transformer oil exceeds the first temperature T1 threshold of 89°C but is lower than the second temperature T2 threshold of 106°C and the gas relay simultaneously initiates the first or second level protection action, or when the temperature of the transformer oil exceeds the set second temperature T2 threshold of 106°C, it indicates that the equipment may be in a high heat load state and there is a risk of causing a fault. This indicates that there may be serious problems such as inter-turn short circuit and insulation damage inside the transformer. Cut off the power supply in time to prevent the fault from further expanding, avoid possible serious accidents such as short circuit and fire, and ensure driving safety.

[0046] By analyzing the frequency and pattern of temperature anomalies and gas relay protection actions, potential fault hazards can be identified, which helps to formulate more accurate preventive maintenance plans, reduce equipment failure rates, and improve train operation reliability.

[0047] The present invention proposes a vehicle-mounted traction transformer gas protection system, please refer to Figure 2 ,include: A monitoring module 100 is configured to monitor the pressure and temperature of the transformer oil inside the transformer and obtain the state of the pressure relief valve; The pressure association module 200 is configured to generate a main circuit breaker trip signal in response to an abnormal internal pressure and when the pressure relief valve triggers a protection action, the whole vehicle stops running; The delay module 300 is configured to trigger a protection action according to the gas relay protection signal to perform gas delay protection in response to the internal pressure being normal and the pressure release valve not triggering a protection action; The temperature association module 400 is configured to initiate a temperature alarm, check the status of a gas relay, and control vehicle operation in response to a temperature abnormality.

[0048] The prior art proposes that when a minor or low-energy fault occurs inside the transformer, the transformer oil slightly decomposes to produce a small amount of gas, which accumulates in the gas relay along the transformer oil expansion loop. When the gas volume exceeds the set value, the gas relay first-level protection (light gas) is activated and an alarm signal is issued; when a serious or high-energy fault occurs inside the transformer, a large amount of heat energy will be generated at the fault site, causing the oil to crack severely and produce a large amount of gas. The expansion of oil and gas will cause the transformer to rise inside, causing the top transformer oil to surge rapidly into the oil storage cabinet in the oil expansion loop. When the flow rate of the expanded oil exceeds 0.6-1 m / s, the gas relay second-level protection (heavy gas) is activated, a trip signal is issued, and the power supply is cut off. There is no correlation between the first-level protection and the second-level protection. However, the ground transformer is a static device, and there is no special working condition such as impact vibration during the operation of the rail vehicle. Therefore, when the rail vehicle transformer directly uses the gas protection strategy of the static transformer, in some sections with poor track conditions, the second-level protection is prone to malfunction.

[0049] The prior art proposes to add two devices: a four-dimensional feature change monitoring module and a heavy gas protection module. The four-dimensional feature change monitoring module monitors the gas volume, oil temperature, oil level and displacement of the baffle of the secondary protection mechanism of the transformer; the heavy gas protection module receives the change signal sent by the four-dimensional feature change monitoring module, sends an action signal to the heavy gas action contact, and the relevant signal is connected in series with the secondary protection signal to reduce the false alarm of the secondary protection signal. However, by adding equipment and four protection signals of gas volume, oil temperature, oil level and action mechanism displacement for associated protection, while reducing the false operation of the gas secondary protection (heavy gas), it also reduces the rapid judgment and response when a fault occurs inside the transformer. If the transformer fault point occurs inside the coil, the coil is located in the middle and lower part of the transformer tank. At the moment of the fault, the temperature and gas of the local coil fault point will change greatly. The temperature, gas, oil level and other detection modules used in this technology are installed on the top of the transformer tank. It takes time for the relevant transmission to the top of the tank. It is not possible to achieve real-time detection, which is easy to cause protection lag for real faults. This technology does not associate with other protection signals closely related to gas protection, and adds two sets of electronic equipment, making the system complex and the reliability of the protection system low.

[0050] The prior art proposes that without adding equipment, the secondary protection signal of the transformer gas relay is sent to the AND gate after a delay, and the action signal of the rapid main protection (line, bus, adjacent transformer protection) of other adjacent equipment of the transformer is sent to the OR gate. The OR gate is sent to the AND gate after a delay and negation. The AND gate comprehensively determines the transformer fault based on the gas relay secondary protection action signal and the rapid main protection action signal of other adjacent equipment to prevent the secondary protection from malfunctioning. However, the rapid protection of equipment such as lines and buses is carried out with non-associated protection, although the malfunction of the gas secondary protection can be reduced by detecting the status of the line or bus. However, the abnormal surge of the expansion oil flow caused by the failure of the above-mentioned equipment, such as the winding insulation discharge failure or the sudden change of vehicle speed causing the oil flow surge inside the on-board transformer, cannot be accurately judged and effective protection cannot be performed. This technology is not applicable to rail vehicle transformers.

[0051] The prior art proposes to add a hydrocarbon gas analyzer to detect the hydrocarbon gas content in the gas relay gas, and at the same time, to perform protection control in association with the gas volume and flow rate limit, so as to realize gas category judgment and protection of the on-board traction transformer of the rail locomotive, so as to reduce the false operation of the gas relay caused by the precipitation of dissolved air in the transformer oil due to the change of altitude and air pressure. However, although the addition of the hydrocarbon gas analyzer realizes gas category judgment and protection, when the vehicle speed changes suddenly or passes through a bumpy section, the vehicle and the on-board equipment will vibrate greatly, causing the on-board transformer gas relay to malfunction due to the up and down disturbance of the internal float, and the second-level protection malfunction due to the abnormal internal oil flow (i.e., L≥limit value L1, S≥limit value S1). This technology cannot distinguish and avoid such situations, and will still cause the vehicle to stop without fault. In addition, the detection time of gas content is long, and the protection action response is slow, which cannot meet the application needs of real-time response and processing of faults when the vehicle is running on the line.

[0052] The prior art proposes to set a lower float limiter on the secondary protection (heavy gas) baffle structure, so that when the baffle structure is in the fault alarm position, it can limit the activity of the lower float action part to prevent triggering the oil shortage fault alarm signal, and can ensure that the baffle structure does not affect the normal activity of the lower float action part when it is in the normal working position. This is to avoid the problem that the double-float gas relay misreports the oil shortage fault signal due to the up and down disturbance of the lower float when a serious fault occurs in the transformer, affecting the fault judgment. However, through the improvement of the secondary protection baffle of the gas relay, although the problem of misreporting the oil shortage fault signal due to the up and down disturbance of the lower float in the case of a serious fault affecting the fault judgment is solved, it cannot solve the problem of the secondary protection baffle causing the gas protection to malfunction due to the abnormal surging of the oil flow inside the on-board transformer when the vehicle speed changes suddenly or passes through a bumpy section, which will cause the vehicle to stop without a fault and affect the safety of operation. This technology is not applicable to rail vehicle transformers.

[0053] The prior art proposes that through a fault analysis of a 500kV transformer gas relay secondary protection (heavy gas) operation, it is concluded that the main reason for the operation of the transformer gas secondary protection (heavy gas) is the oil flow disturbance caused by the vibration of the transformer coil body caused by the large closing excitation surge current. The reason for the large closing excitation surge current is related to the excessive residual magnetism of the transformer. A method for on-site control of the residual magnetism of the transformer is proposed. However, this technology can reduce the oil flow disturbance caused by the closing excitation surge current by controlling the residual magnetism of the transformer, but it is ineffective for the oil flow surge inside the on-board transformer when the vehicle speed changes suddenly or passes through a bumpy section, and is not applicable to on-board transformers.

[0054] The prior art proposes to analyze the reasons for the action of the secondary protection (heavy gas) of the gas relay under non-fault conditions of the transformer based on the structural characteristics of the 500kV shell-type transformer. The protection timing characteristics of the secondary protection misoperation process are studied, and based on this, a protection delay 1s tripping strategy is proposed to prevent the misoperation of the gas secondary protection of the 500kV shell-type transformer. However, the use of a 1s tripping delay after the gas relay secondary protection (heavy gas) is actuated can avoid the misoperation of the gas relay secondary protection caused by sudden external faults such as lightning strikes on the line. However, rail transit transformers are subjected to impact and vibration conditions for a long time during operation. The use of this short-time delay protection cannot avoid the misoperation of the secondary protection. If a long-time delay method is used, the gas relay will actually lose its protection function. Therefore, this technology is not applicable to on-board transformers.

[0055] The prior art states that due to the limited space for equipment layout on the vehicle, not all rail vehicle transformers are suitable for gas relays. Vehicle transformers with oil storage cabinets located above the transformer body are generally equipped with this protection device. Its protection strategy follows the relevant protection strategy for static transformers. However, when the gas protection strategy of static transformers is directly followed, secondary protection malfunctions are prone to occur in some sections with poor track conditions.

[0056] Therefore, the present invention mainly aims to solve the problem of gas protection malfunction caused by the impact and vibration working environment of the rail vehicle in the existing on-board traction transformer gas protection method, thereby affecting the operation safety of the whole vehicle. The present invention proposes a more reliable on-board traction transformer gas protection method. Through the reasonable parameter setting of the protection hardware and the combination with reasonable protection logic, the relevant protection can screen out malfunctions caused by non-fault reasons, thereby improving the reliability of gas protection and further improving the safety of the whole vehicle and traction transformer.

[0057] In some embodiments, see Figure 3 The solution of the present invention is mainly reflected in three aspects: hardware parameters, gas delay protection logic, pressure, temperature and gas related protection logic, as follows: 1) Parameter settings Change the secondary protection flow rate limit of the gas relay from 1m / s to 1.5m / s.

[0058] This limit value can reduce the sensitivity of the secondary protection mechanism to the oil flow surge inside the transformer under the impact and vibration environment of the rail vehicle and cause false operation.

[0059] 2) Gas delay protection logic ① When the gas relay only has the first-level protection action, the signal contact changes from open to closed, and remains closed for 30 seconds. The vehicle microcomputer sends out an alarm signal, and the main circuit breaker of the vehicle does not trip; ② When the gas relay only performs secondary protection, the signal contact changes from open to closed and remains closed for 10 seconds. The vehicle microcomputer sends an alarm signal and the main circuit breaker of the vehicle does not trip.

[0060] ③ When the first and second level protections of the gas relay are activated at the same time and the time meets the respective delay setting values, the vehicle microcomputer sends a main circuit breaker trip signal and the entire vehicle stops running.

[0061] When the vehicle speed changes suddenly or passes through a bumpy section, the vehicle and its on-board equipment will vibrate greatly, which may easily cause the on-board transformer gas relay to malfunction due to the up and down disturbance of the internal float and the secondary protection to malfunction due to abnormal internal oil flow. The above logic can effectively screen out and avoid frequent false alarms or false protections of gas protection that affect the normal driving of the entire vehicle.

[0062] 3) Pressure, temperature and gas related protection logic Add pressure and gas related protection logic judgment. The related protection is as follows: ① When the internal pressure of the transformer is normal, the pressure relief valve has not been protected and the oil temperature is lower than the temperature threshold T1, the gas delay protection is effective and the vehicle operates normally; ② When the pressure relief valve does not protect, the oil temperature is higher than the temperature threshold T1 but lower than the temperature threshold T2, the gas delay protection is effective, and the microcomputer does not send out an alarm signal, and the vehicle runs at reduced power; ③ When any of the following three situations occurs, the vehicle microcomputer sends a main circuit breaker trip signal and the entire vehicle stops running.

[0063] 1) When a fault occurs inside the transformer and the pressure is abnormal, the pressure relief valve protection will be activated; 2) When the oil temperature is higher than the temperature threshold T1 but lower than the temperature threshold T2, the gas delay protection is effective and the microcomputer sends out an alarm signal; 3) The oil temperature is higher than the temperature threshold T2.

[0064] The above logic ensures rapid response and isolation of internal transformer faults to avoid further development of the fault, while also avoiding false operation of gas protection caused by the impact and vibration environment of rail vehicles.

[0065] Based on the same inventive concept, according to another aspect of the present invention, Figure 4 As shown, an embodiment of the present invention further provides a computer device 30, which includes a processor 310 and a memory 320. The memory 320 stores a computer program 321 that can be run on the processor. When the processor 310 executes the program, the steps of the above method are performed.

[0066] Based on the same inventive concept, according to another aspect of the present invention, Figure 5 As shown, an embodiment of the present invention further provides a computer-readable storage medium 40, which stores a computer program 410 for executing the above method when executed by a processor.

[0067] The embodiment of the present invention may also include a corresponding computer device. The computer device includes a memory, at least one processor, and a computer program stored in the memory and executable on the processor, and the processor executes any one of the above methods when executing the program.

[0068] The memory, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules in the embodiments of the present application. The processor executes various functional applications and data processing of the device by running the non-volatile software programs, instructions and modules stored in the memory, that is, implementing the above method.

[0069] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the device, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In an embodiment, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the local module via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0070] Finally, it should be noted that a person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium of the program can be a disk, an optical disk, a read-only storage memory (ROM) or a random access memory (RAM), etc. The above-mentioned computer program embodiments can achieve the same or similar effects as the corresponding above-mentioned arbitrary method embodiments.

[0071] It will also be appreciated by those skilled in the art that various exemplary logic blocks, modules, circuits and algorithm steps described in conjunction with the disclosure herein can be implemented as electronic hardware, computer software or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, a general description has been given to the functions of various schematic components, blocks, modules, circuits and steps. Whether this function is implemented as software or hardware depends on specific applications and the design constraints imposed on the entire system. Those skilled in the art can implement the function in various ways for each specific application, but this implementation decision should not be interpreted as causing a departure from the disclosed scope of the embodiments of the present invention.

[0072] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. The serial numbers of the embodiments disclosed in the above embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

[0073] It should be understood that, as used herein, the singular forms "a", "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations including one or more of the associated listed items.

[0074] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A gas protection method for a vehicle-mounted traction transformer, characterized in that: include: Monitor the pressure and temperature of the transformer oil inside the transformer and obtain the status of the pressure relief valve; In response to abnormal internal pressure and when the pressure relief valve triggers a protection action, a main circuit breaker trip signal is generated and the vehicle stops running; In response to the internal pressure being normal and the pressure relief valve not triggering a protection action, triggering a protection action according to the gas relay protection signal to perform gas delay protection; In response to temperature abnormalities, the temperature alarm is activated, the status of the gas relay is checked, and the vehicle operation is controlled.

2. A vehicle-mounted traction transformer gas protection method according to claim 1, characterized in that: The steps of triggering a protection action according to the gas relay protection signal and performing gas delay protection include: In response to the gas relay only having the first level protection action, the first level protection time does not meet the first delay setting value, the vehicle microcomputer sends a gas alarm signal, and the whole vehicle maintains operation.

3. A vehicle-mounted traction transformer gas protection method according to claim 2, characterized in that: The step of triggering a protection action according to the gas relay protection signal and performing gas delay protection also includes: In response to the gas relay only having the secondary protection action, the secondary protection time does not meet the second delay setting value, the vehicle microcomputer sends a gas alarm signal, and the whole vehicle maintains operation.

4. A vehicle-mounted traction transformer gas protection method according to claim 3, characterized in that: Set the secondary protection flow rate limit of the gas relay to 1.5m / s.

5. A vehicle-mounted traction transformer gas protection method according to claim 3, characterized in that: The step of triggering a protection action according to the gas relay protection signal and performing gas delay protection also includes: In response to the gas relay simultaneously performing the primary protection action and the secondary protection action, and satisfying the first delay setting value and the second delay setting value respectively, the vehicle microcomputer sends a main circuit breaker tripping signal, and the entire vehicle stops running.

6. A vehicle-mounted traction transformer gas protection method according to claim 1, characterized in that: In response to temperature abnormality, the steps of activating a temperature alarm, checking the state of a gas relay, and controlling vehicle operation include: In response to the temperature of the transformer oil exceeding the first temperature but being lower than the second temperature, and the gas relay not performing the primary protection action or the secondary protection action, the vehicle microcomputer sends a power reduction signal, and the entire vehicle maintains operation.

7. The on-vehicle traction transformer gas protection method according to claim 1, characterized in that: In response to temperature abnormality, the steps of activating a temperature alarm, checking the state of a gas relay, and controlling vehicle operation include: In response to the transformer oil temperature exceeding the first temperature but lower than the second temperature and the gas relay generating a primary protection action or a secondary protection action, or the transformer oil temperature exceeding the second temperature, the vehicle microcomputer sends a main circuit breaker tripping signal and the entire vehicle stops running.

8. A vehicle-mounted traction transformer gas protection system, characterized in that: include: A monitoring module configured to monitor the pressure and temperature of transformer oil inside the transformer and obtain a status of a pressure relief valve; A pressure association module is configured to generate a main circuit breaker trip signal in response to an abnormal internal pressure and when the pressure relief valve triggers a protection action, the whole vehicle stops running; A delay module is configured to trigger a protection action according to the gas relay protection signal to perform gas delay protection in response to the internal pressure being normal and the pressure relief valve not triggering a protection action; The temperature association module is configured to start a temperature alarm, check the state of the gas relay, and control the operation of the vehicle in response to abnormal temperature.

9. A computer device comprising: at least one processor; and a memory storing a computer program executable on the processor, wherein the processor executes the steps of a method for gas protection of a vehicle-mounted traction transformer as claimed in any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the on-board traction transformer gas protection method as claimed in any one of claims 1 to 7 are performed.

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