Power rail anti-icing and ice-melting system and method

Abstract

The present invention discloses a power rail anti-icing and de-icing system and method, comprising: a plurality of heating sections, a central control console, a local control cabinet, a field control box, and a temperature and humidity sensor; the heating sections are arranged on the power rail and powered by the field control box, which is connected to the de-icing power supply; the temperature and humidity sensor is arranged on the power rail and provides the local control cabinet with real-time temperature and humidity signals of the environment in which it is located; the central control console controls the operation of the local control cabinet, which in turn controls the operation of the field control box, which in turn controls the operation of the heating sections. This anti-icing and de-icing system can remove ice from the surface of the stainless steel strip of the power rail without causing any damage to the steel-aluminum composite conductive rail, preventing the power rail from icing under specific climatic conditions. In the event that ice forms on the stainless steel strip of the power rail, the system can be used to continuously and quickly de-ice the rail without damaging it.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rail power supply rail heating, and in particular to a power supply rail anti-icing and deicing system and method thereof. Background Art

[0002] The power rails in urban rail transit traction networks are constructed from a stainless steel strip on the contact surface and an aluminum alloy profile on the rail body. Rail vehicles receive electrical energy through sliding contact between the onboard collector shoe and the stainless steel strip, which drives the vehicle and various onboard devices.

[0003] Because the conductive rails are exposed to the atmosphere, ice can form on their surfaces under certain climatic conditions, directly affecting the electrical connection between the rail collector shoe and the rails. In extreme cases, the shoe can even be damaged, causing a vehicle to stop. Because the rails have a very large conductive cross-section and very low resistance per unit length, the power consumption of currently mainstream de-icing methods (such as DC de-icing or full-line resistance heating) is enormous. Therefore, a rail anti-icing and de-icing system and method are needed to prevent ice from forming on the rails, or to remove ice that has formed, without damaging the rail contact surface and using minimal heating power. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention designs a power rail anti-icing and de-icing system and method thereof. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0005] A power rail anti-icing and de-icing system comprises: a plurality of heating sections, a central control console, a local control cabinet, a field control box, and a temperature and humidity sensor. The heating sections are arranged on the power rail and powered by the field control box, which is connected to an ice-melting power supply. The temperature and humidity sensor is arranged on the power rail and provides the local control cabinet with temperature and humidity signals of the environment in real time. The central control console controls the operation of the local control cabinet, which controls the operation of the field control box, which controls the operation of the heating sections.

[0006] Furthermore, the field control box includes: a first circuit breaker, a contactor, a fuse, and a current transmitter; after the first circuit breaker, contactor, and fuse are connected in series, the first circuit breaker is connected to the ice melting power supply, and the fuse is connected to the heating section; the current transmitter is connected to the power supply line of the field control box;

[0007] The local control cabinet includes: a controller, a signal input module, and a signal output module; the signal input module is respectively connected to the temperature and humidity sensor, contactor, and current transmitter, and transmits the temperature and humidity signals, contactor on-off signals, and heating current signals to the controller, and the controller sends a control signal through the signal output module to control the on-off of the contactor; the controller is wirelessly connected to the central control console and other local control cabinets through the communication module.

[0008] Furthermore, a second circuit breaker and an isolation transformer are connected in series between the first circuit breaker and the ice-melting power supply.

[0009] Furthermore, the heating section is composed of heating belts connected in series, a through hole is provided in the middle of the rail head of the power supply rail along the line direction, and the heating belt is installed in the through hole.

[0010] Another embodiment of the present invention further discloses a method for anti-icing and de-icing a power rail using any of the above power rail anti-icing and de-icing systems, comprising the following steps:

[0011] Step (1): Use the temperature and humidity sensor to obtain the temperature of the power rails where the heating sections are located to determine whether the power rails satisfy formula (1). When all power rails do not satisfy formula (1), the anti-icing and ice-melting system is in a standby state until any power rail satisfies formula (1) and enters the next step.

[0012] T Gi ≤0℃ Formula (1)

[0013] Among them, T Gi is the temperature of the power rail where the heating section is located;

[0014] Step (2): Continue to use the temperature and humidity sensor to determine whether the power supply rail that satisfies formula (1) satisfies formula (2). If it does, proceed to the next step; if it does not, go back to step (1) and re-judge.

[0015] T SS ≥ΔT i Formula (2)

[0016] in,

[0017] ΔT i =T Gi -T di Formula (3)

[0018] Where, T ss When the heating section set in the controller starts heating, the difference between the temperature of the power rail where the heating section is located and the current ambient dew point; T di is the dew point of the current environment;

[0019] Step (3): Determine whether the capacity consumed by the currently working system satisfies formula (3). If so, proceed to the next step. If not, proceed to step (1) and re-judge.

[0020]

[0021] Where S is the input power of the entire anti-icing and ice-melting system; S Tj The capacity consumed by the isolation transformer currently in operation; S Ck The control capacity consumed by the local control cabinet currently in operation;

[0022] Step (4): Set the ΔT that meets the requirements i The minimum value in the heating section corresponds to the rated power S Ei Substitute formula (5) for judgment. If the requirements are met, proceed to the next step. If not, go to step (1) and re-judge.

[0023]

[0024] Among them, S T is the rated capacity of a single isolation transformer, S El The capacity of the working heating section connected to the secondary side of the same isolation transformer;

[0025] Step (5): Connect the current loop of the heating segment that meets the requirements of formula (5), and the heating segment starts working. The temperature and humidity of the power supply rail where the heating segment is located are continuously monitored through the temperature and humidity sensor. When it meets the requirements of formula (6), disconnect the current loop of the current heating segment and go to step (1) for re-judgment.

[0026] T SE ≤ΔT i Formula (6)

[0027] Where, T SE When the heating section set in the controller ends heating, the temperature difference between the power rail where the heating section is located and the current ambient dew point.

[0028] Beneficial effects of the present invention:

[0029] 1. This anti-icing and ice-melting system can remove ice from the surface of the stainless steel strip of the power rail without causing any damage to the rail. It prevents the rail from icing under certain climatic conditions. In addition, if the stainless steel strip of the power rail is frozen, the system can be used to continuously and quickly remove ice without damaging the rail.

[0030] 2. A self-limiting temperature resistive heating belt is built into the power rail. By formulating a reasonable heating strategy, the built-in heating device in the power rail is heated in sections and in turns according to the set program to achieve the purpose of anti-icing and ice melting;

[0031] 3. This anti-icing and ice-melting method reduces the power of traditional rail ice melting methods, and achieves the anti-icing and ice-melting function under limited power capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the power supply rail with built-in heating belt;

[0033] Figure 2 This is a schematic diagram of the control structure of the anti-icing and ice-melting system;

[0034] Figure 3 Schematic diagram of the power supply structure of the anti-icing and ice-melting system.

[0035] Figure 4 Schematic diagram of the structure of the heating section of the anti-icing and ice-melting system;

[0036] Figure 5 This is the electrical principle diagram of the field control box;

[0037] Figure 6 This is the structural diagram of the local control cabinet;

[0038] Figure 7 Schematic diagram of the process of anti-icing and ice melting method.

[0039] Description of reference numerals:

[0040] 1-Heating section; 2-Central control console; 3-Local control cabinet; 4-Field control box; 5-Power supply rail; 6-Isolation transformer; 7-Second circuit breaker; 8-Temperature and humidity sensor; 1-1-Heating belt; 3-1-Controller; 3-2-Signal input module; 3-3-Signal output module; 3-4-Communication module; 4-1-First circuit breaker; 4-2-Contactor; 4-3-Fuse; 4-4-Current transmitter. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0042] Example 1

[0043] See Figures 1 to 6An embodiment of the present invention provides a power rail anti-icing and de-icing system, comprising: a heating section 1, a central control console 2, a local control cabinet 3, and a field control box 4; wherein, a plurality of heating sections 1, central control consoles 2, local control cabinets 3, and field control boxes 4 are provided according to the length of the power rail 5, and the number of the heating sections 1 is the same as the number of the field control boxes 4; the heating sections 1 are provided on the power rail 5 and powered by corresponding field control boxes 4, and the field control boxes 4 are connected to an ice-melting power supply; at least two of the field control boxes 4 are electrically connected to one of the local control cabinets 3, and the local control cabinet 3 controls the operation of the field control boxes 4; and at least two of the local control cabinets 3 are electrically connected to one of the central control consoles 2, and the central control console 2 controls the operation of the local control cabinets 3.

[0044] The heating section 1 is composed of heating belts 1-1 connected in series. A through-hole is provided in the middle of the rail head of the power rail 5 along the line direction. The heating belt 1-1 is installed in the through-hole and is electrically connected to the field control box 4, which controls the operation of the heating section 1. The heating belt 1-1 is a self-limiting temperature resistive heating belt.

[0045] Furthermore, the field control box 4 is installed next to the railway at the location of each heating section 1 and is used to control the operation of each heating section 1. The field control box 4 includes: a first circuit breaker 4-1, a contactor 4-2, a fuse 4-3, and a current transmitter 4-4. After the first circuit breaker 4-1, contactor 4-2, and fuse 4-3 are connected in series, the first circuit breaker 4-1 is connected to the ice-melting power supply, and the fuse 4-3 is connected to the heating section 1. The current transmitter 4-4 is connected to the power supply line of the field control box 4 and is used to measure the current in the field control box 4 line to obtain the current power consumption of the field control box 4. AC power is transmitted to the heating belt 1-1 through the first circuit breaker 4-1, contactor 4-2, and fuse 4-3, enabling the heating belt 1-1 to be energized and heated.

[0046] The function of the fuse 4-3 is to disconnect the current loop of the heating belt 1-1 when the insulation between the power supply rail 5 and the heating belt 1-1 is damaged, thereby preventing the traction DC power supply on the power supply rail 5 from being short-circuited with the AC power supply of the ice melting system.

[0047] The anti-icing and de-icing system further includes an isolation transformer 6 and a second circuit breaker 7, which are connected in series between the first circuit breaker 4-1 and the de-icing power supply. The isolation transformer 6 isolates the AC power supply used by the de-icing system from the train's DC traction power supply. This prevents the high-voltage DC power from flowing into the AC power supply via the heating belt 1-1 power line, potentially causing traction network failures that could affect train operation and damage components of the anti-icing and de-icing system. Furthermore, the isolation transformer 6 protects the primary circuitry from damage by the high-voltage DC power supply.

[0048] The AC power supply connected to the field control box 4, i.e., the ice-melting power supply, can be provided by the local control cabinet 3 or an external power source. Furthermore, the anti-icing and ice-melting system also includes a temperature and humidity sensor 8, which is disposed on the power rail 5 and electrically connected to the local control cabinet 3. The temperature and humidity sensor 8 transmits real-time information about the temperature of the power rail 5 and the ambient humidity of the environment surrounding the power rail 5 to the local control cabinet 3.

[0049] Furthermore, the local control cabinet 3 is installed next to the railway on site and is used to control the operation of the on-site control box 4. The local control cabinet 3 includes: a controller 3-1, a signal input module 3-2, and a signal output module; the signal input module 3-2, the controller 3-1, and the signal output module 3-3 are electrically connected in sequence, and the controller 3-1 is wirelessly connected to the central control console 2 and the other local control cabinets 3 through a communication module 3-4, and the communication module 3-4 is an RS485 bus;

[0050] The signal input module 3-2 is connected to the temperature and humidity sensor 8, contactor 4-2 and current transmitter 4-4 respectively, and is used to receive the temperature and humidity signals, contactor on-off signals and heating current signals sent by the temperature and humidity sensor 8, contactor 4-2 and current transmitter 4-4 and transmit them to the controller 3-1; the controller 4-2 is connected to the field control box 4 through the signal output module 3-3, and is used to send control signals to control the on-off of the contactor 4-2.

[0051] Furthermore, the central control console 2 includes an industrial computer and a display operation device; the central control console 2 is installed in the integrated control room of the station or line, and is used for an overview of the working status of the ice melting system line, as well as automatic operation strategy setting and overall control of the input power of each local control cabinet 3. Each line can set up one or more central control consoles 2 according to the division of the operating section, and each central control console 2 can control two or more local control cabinets 3.

[0052] Example 2

[0053] The present invention is aimed at the situation that when all heating sections work at the same time, the total power consumed is greater than the system input power, that is,

[0054]

[0055]

[0056] Where S represents the input power of the entire ice melting system; S Tm is the capacity of a single isolation transformer; S Cn Consumes capacity for a single local control cabinet; S Ei It is the rated capacity of a single heating section. For the heating section with determined length on site, this value is a fixed value because the length of the heating belt is proportional to the power.

[0057] To enable the ice melting system to operate under limited power consumption conditions, the present invention is designed so that each heating section works in turn according to a pre-set program. The central control console and local control cabinets transmit working status to each other via the RS485 bus for protection, ensuring that the total power of the heating sections working at any time is no greater than the system input power.

[0058] See Figure 7 The embodiment of the present invention provides a method for anti-icing and de-icing a power rail using the power rail anti-icing and de-icing system, and the specific steps are as follows:

[0059] Step (1): First, use the temperature and humidity sensor to obtain the temperature of the power rails where the heating sections are located to determine whether the power rails meet the requirements of formula (1). When all power rails do not meet the requirements of formula (1), the anti-icing and ice-melting system is in a standby state until the temperature of any power rail meets the requirements of formula (1) and enters the next step;

[0060] T Gi ≤0℃ Formula (1)

[0061] Among them, T Gi is the temperature of the power rail where the heating section is located;

[0062] Step (2): Then continue to use the temperature and humidity sensor to determine whether the power supply rail that meets the conditions of formula (1) meets the conditions of formula (2). If not, go to step (1) and re-judge. If it meets the requirements, go to the next step:

[0063] T SS ≥ΔT i Formula (2)

[0064] in,

[0065] ΔT i =T Gi -T di Formula (3)

[0066] Where, T ssWhen the heating section set in the controller starts heating, the difference between the temperature of the power rail where the heating section is located and the current ambient dew point; T di is the dew point of the current environment;

[0067] Step (3): Determine the capacity consumed by the currently working system. If the condition of formula (3) is satisfied, proceed to the next step. If the condition of formula (3) is not satisfied, proceed to step (1) and re-determine.

[0068]

[0069] Where S is the input power of the entire anti-icing and ice-melting system; S Tj The capacity consumed by the isolation transformer currently in operation; C Sk The control capacity consumed by the local control cabinet currently in operation;

[0070] Step (4): Set the ΔT that meets the requirements i The minimum value in the heating section corresponds to the rated power S Ei Substitute into formula (5) for judgment. When the conditions of formula (5) are met, proceed to the next step. If the requirements are not met, go to step (1) and judge again. Among them, if ΔT i =ΔT i+m When , the heating section power corresponding to the value with the smaller subscript is judged first;

[0071]

[0072] Among them, S T is the rated capacity of a single isolation transformer, S El The capacity of the working heating section connected to the secondary side of the same isolation transformer;

[0073] Step (5): The current loop of the heating section that meets the condition of formula (5) is connected, and the heating section starts working. The current temperature and humidity of the power supply rail where the heating section is located are continuously monitored through the temperature and humidity sensor. When it meets the condition of formula (6), the current loop of the heating section is disconnected, and the process goes to step (1) to continue the judgment.

[0074] T SE ≤ΔT i Formula (6)

[0075] When the system is in semi-automatic mode, it directly proceeds to step (3) for execution; when the system is in manual mode, it directly specifies a specific heating section to work, and it only needs to satisfy equations (1) and (2) during operation.

[0076] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A power rail anti-icing and ice-melting method, characterized in that: include: Several heating sections, a central control console, a local control cabinet, a field control box, and a temperature and humidity sensor; the heating section is arranged on a power supply rail and is powered by the field control box, which is connected to an ice-melting power supply; the temperature and humidity sensor is arranged on the power supply rail and provides the local control cabinet with temperature and humidity signals of the environment in real time; the central control console controls the operation of the local control cabinet, which controls the operation of the field control box, which controls the operation of the heating section; The field control box includes: a first circuit breaker, a contactor, a fuse, and a current transmitter; after the first circuit breaker, contactor, and fuse are connected in series, the first circuit breaker is connected to the ice melting power supply, and the fuse is connected to the heating section; the current transmitter is connected to the power supply line of the field control box; The local control cabinet includes: a controller, a signal input module, and a signal output module; the signal input module is respectively connected to the temperature and humidity sensor, the contactor, and the current transmitter, and transmits the temperature and humidity signal, the contactor on / off signal, and the heating current signal to the controller, and the controller sends a control signal through the signal output module to control the on / off of the contactor; the controller is wirelessly connected to the central control console and other local control cabinets through the communication module; A second circuit breaker and an isolation transformer are connected in series between the first circuit breaker and the ice-melting power supply; The anti-icing and ice-melting method comprises the following steps: Step 1: Use the temperature and humidity sensor to obtain the temperature of the power rails where the heating sections are located to determine whether the power rails satisfy equation (1). When all power rails do not satisfy equation (1), the anti-icing and ice-melting system is in standby mode until any power rail satisfies equation (1) and enters the next step. ； in, is the temperature of the power rail where the heating section is located; Step 2: Continue to use the temperature and humidity sensor to determine whether the power supply rail that satisfies formula (1) satisfies formula (2). If it does, proceed to the next step; if it does not, go to step 1 and re-judge. ； in, ； Where, When the heating section set in the controller starts heating, the difference between the temperature of the power rail where the heating section is located and the current ambient dew point; is the dew point of the current environment; Step 3: Determine whether the capacity consumed by the currently working system satisfies formula (3). If so, proceed to the next step. If not, proceed to step 1 and re-judge. ； Where S is the input power of the entire anti-icing and ice-melting system; The capacity consumed by the isolation transformer currently in operation; The control capacity consumed by the local control cabinet currently in operation; Step 4: The required The minimum value corresponds to the rated power of the heating section Substitute formula (5) for judgment. If the requirements are met, proceed to the next step. If not, go to step 1 and make a new judgment. ； in, is the rated capacity of a single isolation transformer, The capacity of the heating section connected to the secondary side of the same isolation transformer in operation; Step 5: Connect the current loop of the heating segment that meets the requirements of formula (5), and the heating segment starts working. The temperature and humidity sensor continuously monitors the current temperature and humidity of the power rail where the heating segment is located. When it meets the requirements of formula (6), disconnect the current loop of the current heating segment and go back to step 1 for re-judgment. ； Where, When the heating section set in the controller ends heating, the temperature difference between the power rail where the heating section is located and the current ambient dew point.

2. The power rail anti-icing and de-icing method according to claim 1, characterized in that: The heating section is composed of heating belts connected in series. A through hole is provided in the middle of the rail head of the power supply rail along the line direction, and the heating belt is installed in the through hole.

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