An adaptive protection method applied to an at traction network, an electrical instrument and a medium

Abstract

The application discloses a kind of applied to AT traction network self-adapting protection method, electrical instrument and medium, the method includes the following steps: relay protection device receives and processes locomotive information, obtains locomotive counting result;According to the locomotive counting result, the setting state of relay protection device is adjusted;According to the setting state of relay protection device, the working state of traction network is judged and the working state of relay protection device is adjusted;According to the working state and working time of relay protection device, it is judged whether protection outlet action is carried out.The application discloses a kind of applied to AT traction network self-adapting protection method, can accurately judge whether traction network is in empty load or load state, realizes traction network self-adapting protection, improves protection discernment ability.

Description

Technical Field

[0001] This invention belongs to the field of monitoring and protection technology for electrified railways, specifically relating to an adaptive protection method, electrical instruments, and media applied to AT traction networks. Background Technology

[0002] AT traction networks are widely used to provide AC 27.5kV single-phase power to high-speed railway EMUs. Traditional protection relies solely on electrical information from traction substations, using the maximum load current of the traction network as a threshold, and cannot adaptively determine fault current and locomotive load current. As EMU power and traffic density continue to increase, the threshold values ​​of traditional protection need to be continuously raised, further reducing fault identification capability, and making accurate fault identification even more challenging. Summary of the Invention

[0003] To address the shortcomings of existing AT traction network protection technologies, this invention provides an adaptive protection method for AT traction networks, which can accurately determine whether the traction network is in an unloaded or loaded state, thereby achieving adaptive protection of the traction network and improving protection identification capabilities.

[0004] To solve the above problems, the present invention is implemented according to the following technical solution:

[0005] An adaptive protection method for AT traction networks, the method comprising the steps of:

[0006] The locomotive counting result is obtained by the relay protection device processing the locomotive information received.

[0007] Adjust the setting status of the relay protection device based on the locomotive counting results;

[0008] Based on the setting status of the relay protection device, determine the working status of the traction network and adjust the working status of the relay protection device.

[0009] Based on the operating status and operating time of the relay protection device, determine whether to perform protection output action.

[0010] Furthermore, based on the locomotive counting results, the step of adjusting the setting status of the relay protection device includes the following steps:

[0011] When the locomotive count result is greater than or equal to 1, the relay protection device is set to Zone 1, and the traction network is judged to be in a load operation state.

[0012] When the locomotive count is 0, the relay protection device is set to Zone 2, indicating that the traction network is in an unloaded operating state.

[0013] Furthermore, the steps involve determining the operating status of the traction network and adjusting the operating status of the relay protection device based on its setting status, including the following steps:

[0014] When the relay protection device is set to Zone 1, compare the equivalent current value with the overload setting value.

[0015] When the relay protection device is set to zone two, compare the equivalent current value with the maximum no-load current.

[0016] When the equivalent current value is greater than the overload setting value, the overload protection of the relay protection device is activated.

[0017] When the equivalent current value is greater than the maximum no-load current, the no-load protection of the relay protection device is activated.

[0018] Furthermore, based on the operating status and operating time of the relay protection device, the procedure determines whether to initiate a protection output action, including the following steps:

[0019] When the overload protection is activated, it is determined whether the overload protection duration exceeds the first rated time. If the overload protection duration exceeds the first rated time, the protection output will be activated; otherwise, the equivalent current value will be compared with the overload setting value.

[0020] When the no-load protection is activated, it is determined whether the no-load protection duration exceeds the second rated time. If the no-load protection duration exceeds the second rated time, the protection output will be activated; otherwise, the equivalent current value will continue to be compared with the maximum no-load current.

[0021] Furthermore, the process of obtaining the locomotive counting result, before the relay protection device processes the locomotive information received, also includes the following steps:

[0022] Ground transponders are used to collect and transmit locomotive information to the information transmission device;

[0023] The information transmission device receives and transmits locomotive information to the relay protection device.

[0024] Locomotive information includes information on electric locomotives entering and / or leaving the power supply area.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention discloses an adaptive protection method for AT traction networks. By adjusting the setting state of the relay protection device based on the locomotive counting results, the working state of the traction network is determined, thereby realizing adaptive protection of the traction network and improving the reliability of the traction network power supply.

[0027] The present invention also discloses an electrical instrument, comprising:

[0028] processor;

[0029] Memory used to store the processor's executable instructions;

[0030] The processor is configured to execute the instructions to implement the aforementioned adaptive protection method.

[0031] The present invention also discloses a computer-readable storage medium, which is a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed, implements the above-described adaptive protection method. Attached Figure Description

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0033] Figure 1 This is a schematic diagram of the adaptive protection method described in Example 1;

[0034] Figure 2 This is a schematic diagram of the overall structure of the adaptive protection method described in Example 1;

[0035] Figure 3 This is a schematic diagram of the logical judgment in step S4 of the adaptive protection method described in Example 1;

[0036] Figure 4 This is a schematic diagram of the device described in Example 2. Detailed Implementation

[0037] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0038] Example 1

[0039] like Figure 1 , 2 This embodiment discloses an adaptive protection method applied to AT traction networks, including the following steps:

[0040] S1. A first ground transponder is installed on the rails in the de-energized area of ​​the traction substation. The first ground transponder collects information on electric locomotives entering the AT substation's power supply area. A second ground transponder is installed on the rails in the de-energized area of ​​the substation. The second ground transponder collects information on electric locomotives leaving the AT substation's power supply area. The first ground transponder and the second ground transponder respectively transmit the collected information to the information transmission device.

[0041] S2. The information transmission device receives and transmits information about electric locomotives entering the AT power supply area and leaving the AT power supply area to the relay protection device in the traction substation.

[0042] S3. The relay protection device receives information about electric locomotives entering and leaving the AT power supply area, performs locomotive counting processing, and obtains the locomotive counting result n. When there are no locomotives running in the AT power supply area, the initial value of the locomotive counting result n is 0. When a locomotive enters the AT power supply area, the locomotive counting result n increases by 1. When a locomotive leaves the AT power supply area, the locomotive counting result n decreases by 1.

[0043] S4. Adjust the setting status of the relay protection device according to the locomotive counting result n.

[0044] S5. Based on the setting status of the relay protection device, determine the working status of the traction network and adjust the working status of the relay protection device.

[0045] S6. Determine whether to perform protection output action based on the operation and time of the relay protection device.

[0046] like Figure 3 Specifically, step S4 includes:

[0047] When the locomotive count result n is greater than or equal to 1, the relay protection device is set to Zone 1, and the traction network is judged to be in a load operation state.

[0048] When the locomotive count result n is 0, the relay protection device is set to zone two, and the traction network is judged to be in an unloaded operating state.

[0049] Specifically, step S5 includes:

[0050] When the relay protection device is set to zone one, compare the equivalent current value I. ts With overload setting value I set Size.

[0051] When the relay protection device is set to zone two, compare the equivalent current value I. ts With the maximum no-load current I ε Size.

[0052] When I ts ≥1.2I set When the overload protection of the relay protection device is activated, the protection will be activated; otherwise, the protection will not be activated.

[0053] When I ts ≥I ε When the relay protection device is in operation, the no-load protection will be activated; otherwise, the protection will not be activated.

[0054] In the above embodiments, I tsI is the equivalent current value of the traction substation. ts =I c1 -I f1 +I c2 -I f2 I c1 For the upstream contact network current, I f1 For the uplink negative feeder current, I c2 Downstream contact network current, I f2 The overload setting value is I, which represents the downstream negative feeder current. set =nI E I E I is the maximum operating current of a locomotive. ε This is the maximum no-load current of the traction network.

[0055] Specifically, step S6 includes:

[0056] When the relay protection device is set to Zone 1 and the overload protection is activated, it is determined whether the overload protection duration t exceeds the first rated time. when If the overload protection duration exceeds the first rated time, the protection output will activate; otherwise, the comparison of the equivalent current value I will continue. ts With overload setting value I set Size.

[0057] When the relay protection device is set to Zone 2 and the no-load protection is activated, it is determined whether the duration of the no-load protection exceeds the second rated time. When the no-load protection duration exceeds the second rated time If the protection output is activated, the equivalent current value I will continue to be compared; otherwise, the comparison will continue. ts With the maximum no-load current I ε Size.

[0058] This embodiment obtains the locomotive count results entering the AT power supply area, adjusts the setting state of the relay protection device, and determines whether the traction network is in an unloaded or loaded state, thereby realizing adaptive protection of the traction network and improving the fault protection capability of the traction network; it is also simple, reliable, and easy to implement in engineering practice.

[0059] Example 2

[0060] like Figure 4 This embodiment discloses an electrical instrument, which includes: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the adaptive protection method in embodiment 1.

[0061] Example 3

[0062] This embodiment discloses a computer-readable storage medium, which is a computer-readable storage medium, on which a computer program is stored. When the computer program is executed, it implements the adaptive protection method in Embodiment 1.

[0063] Optionally, the computer-readable storage medium may include: read-only memory (ROM), random access memory (RAM), solid-state drives (SSDs), or optical discs, etc. The random access memory may include resistive random access memory (ReRAM) and dynamic random access memory (DRAM).

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for adaptive protection applied to an AT traction network, characterized in that, The method comprises the steps of: obtaining a locomotive counting result, the counting result being obtained by processing locomotive information received by the relay protection device; adjusting the setting state of the relay protection device according to the locomotive counting result, including: when the locomotive counting result is greater than or equal to 1, judging that the traction network is in a load operation state, and setting the relay protection device to a zone, the zone being an overload protection; and when the locomotive counting result is 0, judging that the traction network is in an empty load operation state, and setting the relay protection device to a zone, the zone being an empty load protection; judging the working state of the traction network and adjusting the working state of the relay protection device according to the setting state of the relay protection device; judging whether to perform a protection outlet action according to the working state and working time of the relay protection device.

2. The adaptive protection method of claim 1, wherein, The step of judging the working state of the traction network and adjusting the working state of the relay protection device according to the setting state of the relay protection device comprises the following steps: when the relay protection device is set to a zone, comparing the size of the equivalent current value and the overload setting value; when the relay protection device is set to a zone, comparing the size of the equivalent current value and the maximum empty load current; when the equivalent current value is greater than the overload setting value, the relay protection device overload protection starts; when the equivalent current value is greater than the maximum empty load current, the relay protection device empty load protection starts.

3. The adaptive protection method according to claim 2, characterized in that, The step of judging whether to perform a protection outlet action according to the working state and working time of the relay protection device comprises the following steps: when the overload protection starts, judging whether the overload protection duration exceeds a first rated time, when the overload protection duration exceeds the first rated time, the protection outlet action is performed, otherwise, the size of the equivalent current value and the overload setting value is continuously compared; when the empty load protection starts, judging whether the empty load protection duration exceeds a second rated time, when the empty load protection duration exceeds the second rated time, the protection outlet action is performed, otherwise, the size of the equivalent current value and the maximum empty load current is continuously compared.

4. The adaptive protection method of claim 1, wherein, The step of obtaining a locomotive counting result, the counting result being obtained by processing locomotive information received by the relay protection device, further comprises the following steps: collecting and transmitting the locomotive information to the information transmission device by using the ground transponder; receiving and transmitting the locomotive information to the relay protection device by the information transmission device; the locomotive information includes information of the electric locomotive entering and / or leaving the power supply area.

5. An electrical instrument, characterized by comprise: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the adaptive protection method of any one of claims 1-4.

6. A computer-readable storage medium, characterized in that, It is a computer readable storage medium, which stores a computer program, the computer program is executed to implement the adaptive protection method of any one of claims 1-4.

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