Mobile ice melting device for overhead line system

Abstract

The utility model belongs to the technical field of line ice melting, and discloses a movable ice melting device for a contact network, a circuit breaker is used as an incoming line and feeder line switch of the ice melting device, each current transformer and a touch shell current transformer are used for measuring incoming line and feeder line current of the ice melting device, and a voltage transformer is used for measuring output voltage of the ice melting device; a gear controller, a pressure detector and a temperature sensor of the ice melting transformer are all connected with the transformer protection device; the wireless temperature measurement sensor is fixed on the ice melting contact network, and the output end of the wireless temperature measurement sensor is connected with the feeder protection device; the output signals of the transformer protection device and the feeder line protection device are sent to the control background through the switch, and the control background remotely monitors the current and voltage of the ice melting device, the gear, temperature and pressure of the transformer and the temperature of the ice melting contact network. The device can be rapidly and flexibly installed in a contact network ice-melting section, and can output safe and efficient ice-melting current.

Description

TECHNICAL FIELD

[0001] The utility model belongs to line ice melting technical field relates to a kind of overhead line system movable ice melting device. BACKGROUND

[0002] As an important part of electrified railway traction power supply system, overhead line system provides electric energy for electric locomotive or motor train unit, and its operation state directly determines the operation efficiency and reliability of the entire electrified railway system. However, its characteristics of being exposed to air make it vulnerable to external factors such as climate, terrain and extreme weather. In recent years, with the large-scale construction of passenger high-speed and freight heavy-haul railways in China, railway lines have extended to various climate regions. In cold, humid, windy and high-altitude areas, under severe weather conditions such as cold and humid convection, overhead line system equipment is prone to icing, affecting the good contact between the pantograph on the train head and the overhead line system, causing the motor train unit to be unable to stably obtain power from the overhead line system, resulting in poor current collection and arcing. In addition, under the action of wind, the iced overhead line system may experience fluttering, which can cause wire ablation, pantograph scraping and pantograph detachment, etc. Once the overhead line system fails, it will pose a serious threat to the safe operation of the railway. The existing overhead line system uses manual cleaning and ice melting, which is extremely inefficient, has poor safety in high-altitude operation, and is prone to breaking the overhead line system, causing accidents. Moreover, the ice-melting area of the overhead line system is large and uncertain, especially when the overhead line system is severely iced, causing train operation to be suspended. Manual ice melting is difficult to complete quickly, which cannot guarantee the stability of railway transportation order, cannot guarantee the safe, reliable and all-weather operation of trains in various harsh environments, reduce the impact on normal high-speed rail transportation order, and ensure people's travel.

[0003] Therefore, it is of great practical significance to study a movable overhead line system ice melting device that can effectively melt ice after an ice disaster occurs, ensure the stable operation of the overhead line system under various conditions, improve the stability and safety of electrified railway traction power supply. UTILITY MODEL CONTENTS

[0004] The utility model aims to solve the above-mentioned problems in the prior art, and provides an overhead line system movable ice melting device. The device can be moved and quickly and flexibly installed in the overhead line system ice melting section, can output safe and efficient ice melting current, and can disconnect the ice melting current when the overhead line system temperature is too high during ice melting, so as to not only quickly and efficiently melt the overhead line system, ensure the stable operation of the overhead line system under various conditions, improve the stability and safety of electrified railway traction power supply, but also avoid the overheating of the overhead line system during ice melting, which not only protects the safety of the overhead line system power supply system but also ensures the safety of the operator, providing reliable protection for safe railway transportation.

[0005] In order to achieve the above object, the technical scheme of the utility model is: a contact net mobile ice melting device, including ice melting device, the ice melting device is placed on the mobile vehicle, including ice melting switch box, ice melting transformer, protection system and wireless temperature measurement system, the protection system includes control backstage, transformer protection device, feeder protection device and switch, control backstage passes through switch with transformer protection device and feeder protection device respectively and is connected, wireless temperature measurement system passes through control line and is connected with feeder protection device, and each wireless temperature measurement sensor thereof is fixed on ice melting contact net, the ice melting switch box includes circuit breaker, voltage transformer, current transformer, fuse and crash shell current transformer, one circuit breaker is used as the incoming line switch of ice melting device, and is connected between the output power supply of transformer substation and the A end of ice melting transformer, the X end of ice melting transformer is connected with the centralized grounding box of transformer substation, another circuit breaker is used as the feeder switch of ice melting device, and is connected between the a end of ice melting transformer and the uplink T line of ice melting contact net, the downlink T line of ice melting contact net is connected with the x end of ice melting transformer, the x end of ice melting transformer is connected with the centralized grounding box of transformer substation, one current transformer is used for measuring the incoming line current of ice melting device, and the primary terminal thereof is connected in series on the connecting bus of circuit breaker and ice melting transformer, and the secondary terminal thereof is connected with the current measurement terminal of transformer protection device, another current transformer is used for measuring the feeder current of ice melting device, and the primary terminal thereof is connected in series on the connecting bus of another circuit breaker and ice melting transformer, and the secondary terminal thereof is connected with the current measurement terminal of feeder protection device, the crash shell current transformer is used for monitoring the grounding current, and the primary terminal thereof is connected in series on the grounding bus of ice melting switch box, and the secondary terminal thereof is connected with another current measurement terminal of transformer protection device, the voltage transformer is used for measuring the output voltage of ice melting device, and one end of the primary terminal thereof is connected in series on the a end of ice melting transformer after fuse, and the other end is grounded, and the secondary terminal thereof is connected with the voltage measurement terminal of feeder protection device.

[0006] Further preferably, the ice melting transformer includes an oil-immersed single-phase transformer, a tapping switch installed on a low-voltage winding of the oil-immersed single-phase transformer, a gear controller, a pressure detector, and a temperature sensor; a motor of the tapping switch is connected to the gear controller through a control line; the gear controller is connected to the transformer protection device through a network; the pressure detector and the temperature sensor are both connected to the transformer protection and control device through control lines; and the AC / DC screen provides AC and DC power for the tapping switch and the gear controller.

[0007] Further preferably, the wireless temperature measurement system further includes a temperature data processor connected to the feeder protection device through a control line; the wireless temperature measurement sensor includes a temperature sensing chip, a signal repeater, and a photovoltaic power generation module; the temperature sensing chip is connected to the ice melting contact net, a signal output end of the temperature sensing chip is connected to the signal repeater, and the signal repeater is connected to the temperature data processor through a network.

[0008] Further preferably, the ice melting device further comprises a lightning arrester, which is connected in parallel with the series-connected fuse and trolley-type voltage transformer, and has one end connected to the a terminal of the ice melting transformer and the other end grounded. In order to avoid damage to the ice melting device caused by impulse voltage, the lightning arrester is installed on the trolley-type voltage transformer.

[0009] Further preferably, the ice melting device further comprises a control cabinet, which is fixed in the ice melting switch box; the circuit breaker and the voltage transformer are both fixed on the base of the ice melting switch box; and the transformer protection device, the feeder protection device, the switch, the gear controller and the temperature data processor are fixed in the control cabinet.

[0010] The ice melting switch box of the utility model further has an AC / DC screen fixed therein, which provides AC and DC power supply for the circuit breaker, the voltage transformer, the protection system, the wireless temperature measurement system, the tap changer and the gear controller.

[0011] The utility model discloses a movable ice melting device, which can be quickly and flexibly installed in the overhead contact line ice melting section. The 27.5kV power supply of the railway substation is led to the ice melting transformer through the ice melting switch box. The appropriate gear and corresponding protection setting value of the ice melting transformer are analyzed according to the icing condition of the overhead contact line and the structure parameter of the electrified railway power supply system, and these parameters are set through the control background of the ice melting device, so that the ice melting device outputs safe and efficient ice melting current, the output end of the ice melting transformer is connected to the overhead contact line through the ice melting switch box, and the overhead contact line is quickly and efficiently melted. The ice melting device is also provided with a wireless temperature measurement system. The resistance value of some wires in the ice melting overhead contact line circuit is relatively large and easy to heat, and the current that can be borne is small. Therefore, the wireless temperature measurement sensor is arranged and installed at these weak points of the ice melting overhead contact line to monitor the temperature change of the overhead contact line during the ice melting process. When the temperature of the overhead contact line is too high, the protection control system cuts off the feeder switch, i.e. the trolley-type circuit breaker, of the ice melting device, so as to avoid the overheating of the overhead contact line during the ice melting process and the burning of the overhead contact line. The utility model can effectively melt ice after ice disaster occurs, ensure the stable operation of the overhead contact line under various conditions, improve the stability and safety of the electrified railway traction power supply, and in general, the utility model can protect the safety of the overhead contact line power supply system and ensure the safety of the operator, and provides reliable guarantee for the safe transportation of the railway. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of the ice melting circuit of the utility model;

[0013] Figure 2 It is a primary system diagram of the utility model;

[0014] Figure 3 It is a top view of the utility model;

[0015] Figure 4 This is the front view of the present invention;

[0016] Figure 5 This is a left view of the ice-melting switch box in this utility model;

[0017] Figure 6 This is a right view of the ice-melting switch box in this utility model;

[0018] Figure 7 This is a schematic diagram of the control cabinet in this utility model;

[0019] Figure 8 This is a schematic diagram of the wireless temperature measurement system in this utility model.

[0020] In the diagram, 1 is the de-icing transformer, 3 is the de-icing switch box, 6 is the circuit breaker, 7 is the voltage transformer, 8 is the AC / DC panel, 9 is the control cabinet, 10 is the contact current transformer, 11 is the tap changer, 13 is the current transformer, 14 is the fuse, 17 is the temperature data processor, 18 is the gear position controller, 19 is the transformer protection device, 20 is the switch, 22 is the feeder protection device, 23 is the signal repeater, 24 is the temperature sensing chip, 25 is the photovoltaic power generation module, 26 is the surge arrester, 27 is the pressure detector, 28 is the temperature sensor, 29 is the substation, and 30 is the de-icing contact network. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 8 As shown, this embodiment includes a mobile vehicle and an ice-melting device mounted on the mobile vehicle. The ice-melting device includes an ice-melting switch box 3, an ice-melting transformer 1, a protection system, a control cabinet 9, a wireless temperature measurement system, and an AC / DC power supply panel 8. The control cabinet 9 and the AC / DC power supply panel 8 are fixed inside the ice-melting switch box 3.

[0023] The ice-melting switch box 3 comprises two circuit breakers 6, a voltage transformer 7, two current transformers 13, a fuse 14 and a ground fault current transformer 10. In this embodiment, the two circuit breakers 6 are handcart-type circuit breakers 6, and the voltage transformer 7 is a handcart-type voltage transformer, which are convenient to move and install. Both the two circuit breakers 6 and the voltage transformer 7 are fixedly installed on the base of the ice-melting switch box 3. One of the circuit breakers 6 is used as an incoming line switch of the ice-melting device, and is connected at one end to the output power supply of the substation 29 and at the other end to the A terminal of the primary side of the ice-melting transformer 1. The X terminal of the primary side of the ice-melting transformer 1 is connected to the centralized grounding box of the substation 29. The other circuit breaker 6 is used as a feeder switch of the ice-melting device, and is connected at one end to the a terminal of the secondary side of the ice-melting transformer 1 and at the other end to the uplink T line of the ice-melting overhead contact system 30. The downlink T line of the ice-melting overhead contact system 30 is connected to the x terminal of the secondary side of the ice-melting transformer 1, and the x terminal of the secondary side of the ice-melting transformer 1 is connected to the centralized grounding box of the substation 29. One of the current transformers 13 is used to measure the incoming line current of the ice-melting device, and is connected at one end to the connection bus between the circuit breaker 6 and the A terminal of the primary side of the ice-melting transformer 1 and at the other end to the current measurement terminal of the transformer protection device 19. The other current transformer 13 is used to measure the feeder current of the ice-melting device, and is connected at one end to the connection bus between the other circuit breaker 6 and the a terminal of the secondary side of the ice-melting transformer 1 and at the other end to the current measurement terminal of the feeder protection device 22. The ground fault current transformer 10 is used to monitor the ground fault current, and is connected at one end to the grounding bus of the ice-melting switch box 3 and at the other end to the other current measurement terminal of the transformer protection device 19. The voltage transformer 7 is used to measure the output voltage of the ice-melting device, and is connected at one end to the a terminal of the secondary side of the ice-melting transformer 1 after the fuse 14 and at the other end to the grounding bus, and is connected at the secondary terminal to the voltage measurement terminal of the feeder protection device 22. When the transformer protection device 19 and the feeder protection device 22 detect that the current and voltage of the ice-melting device are too high, the protection system sends a disconnecting instruction to the circuit breaker 6 to avoid the ice-melting device from being damaged by excessive current and voltage. When a ground fault occurs in the ice-melting device, a backflow current is generated on the grounding bus, and the protection system detects that the ground fault current transformer 10 has a current signal, and the protection system sends a disconnecting instruction to the circuit breaker 6 to realize the short-circuit protection function of the ice-melting device. In order to avoid the damage of the ice-melting device caused by the impact voltage, a lightning arrester 26 is installed on the voltage transformer in this embodiment, and the lightning arrester 26 is connected in parallel with the fuse 14 and the voltage transformer 7, and is connected at one end to the a terminal of the secondary side of the ice-melting transformer 1 and at the other end to the grounding bus.

[0024] The ice-melting transformer 1 is an oil-immersed single-phase transformer with a wide range of multi-gear voltage regulation, comprising an oil-immersed single-phase transformer, a tap changer 11, a gear controller 18, a pressure detector 27 and a temperature sensor 28. The coil of the oil-immersed single-phase transformer comprises a high-voltage winding, a low-voltage winding and a low-voltage regulating winding. The tap changer 11 is installed on the low-voltage winding, and the motor of the tap changer 11 is connected to the gear controller 18 through a control line. The gear controller 18 is connected to the transformer protection device 19 through a network. The signal output end of the pressure detector 27 and the signal output end of the temperature sensor 28 are both connected to the signal input end of the transformer protection device 19 through control lines. In this embodiment, the pressure detector 27 comprises a pressure probe and a pressure transmitter electrically connected to the pressure probe, and the pressure transmitter is connected to the transformer protection device 19 through a control line. The pressure probe is installed inside the oil-immersed single-phase transformer, and is used to measure the pressure change of the oil inside the oil-immersed single-phase transformer. The pressure transmitter is installed outside the oil-immersed single-phase transformer, and the pressure probe transmits the pressure change signal inside the oil-immersed single-phase transformer to the pressure transmitter. The pressure detector 27 finally transmits the pressure change signal of the oil inside the oil-immersed single-phase transformer to the transformer protection device 19. The temperature sensor 28 comprises a temperature sensor probe and a temperature transmitter, and the temperature transmitter is connected to the transformer protection device 19 through a control line. The temperature sensor probe is installed inside the oil-immersed single-phase transformer, and is used to measure the temperature change of the oil-immersed single-phase transformer. The temperature transmitter is installed outside the oil-immersed single-phase transformer, and the temperature sensor probe transmits the temperature change signal of the oil-immersed single-phase transformer to the temperature transmitter. The temperature transmitter then transmits the temperature change signal to the transformer protection device 19.

[0025] The protection system comprises a control background, a transformer protection device 19, a feeder protection device 22 and a switch 20. In this embodiment, the control background is an industrial control all-in-one machine, and can be flexibly arranged in the substation operating room according to the ice-melting operation site. The control background is connected to the switch 20 through a network, and the switch 20 is connected to the transformer protection device 19 and the feeder protection device 22 through a network respectively. The output signals of the transformer protection device 19 and the feeder protection device 22 are sent to the control background through the switch 20, and the control background remotely monitors the current and voltage of the ice-melting device, the gear, temperature and pressure of the transformer and the temperature of the ice-melting overhead line.

[0026] The wireless temperature measurement system comprises a plurality of wireless temperature measurement sensors and a temperature data processor 17. The wireless temperature measurement sensors are fixed at the places where the ice-melting overhead line 30 is prone to heat and temperature rise, and are connected to the temperature data processor 17 through a network; the temperature data processor 17 is connected to the feeder protection device 22 through a control line. In the embodiment, the wireless temperature measurement sensor comprises a temperature sensing chip 24, a signal repeater 23 and a photovoltaic power generation module 25, and is fixed as a whole on the ice-melting overhead line, the temperature sensing chip 24 is connected to the places where the ice-melting overhead line 30 is prone to heat and temperature rise, the signal output end of the temperature sensing chip 24 is connected to the signal repeater 23, and the signal repeater 23 is connected to the temperature data processor 17 through a network. The wireless temperature measurement sensor is fixed as a whole on the ice-melting overhead line 30, and is used for monitoring the places where the ice-melting overhead line 30 loop is prone to heat and temperature rise. The temperature sensing chip 24 converts the non-electric quantity signal of the temperature of the ice-melting overhead line into an electric signal, and transmits the electric signal to the signal repeater 23; the signal repeater 23 sends the electric signal to the temperature data processor 17 through a 4G / 5G transmission mode. The temperature data processor 17 is used for receiving the signal sent by the wireless temperature measurement sensor and performing signal analysis, data operation and information storage; the temperature data processor 17 transmits the actual temperature value obtained by operating the signal sent by each wireless temperature measurement sensor to the feeder protection device 22. When the feeder protection device 22 detects that the temperature of the ice-melting overhead line exceeds the set value, a disconnecting signal is sent to the circuit breaker 6, so that the ice-melting device stops ice melting. At the same time, the feeder protection device 22 transmits the real-time temperature of the ice-melting overhead line to a control background, and an ice-melting operator can monitor the temperatures of all points of the ice-melting overhead line through the control background.

[0027] The transformer protection device 19, the feeder protection device 22, the switch 20, the gear controller 18 and the temperature data processor 17 are fixed in the control cabinet 9. The AC / DC screen 8 provides AC and DC power supply for the circuit breaker 6, the voltage transformer 7, the protection system, the wireless temperature measurement system, the tap changer 11 and the gear controller 18.

[0028] Of course, the utility model also has other various embodiments, in the case of not violating the spirit and essence of the utility model, the person skilled in the art can make corresponding change and deformation according to the utility model, but these corresponding change and deformation all should belong to the improvement of equivalent technology, belong to the protection scope of claims of the utility model.

Claims

1. A mobile ice-melting device for a catenary, comprising an ice-melting device, characterized in that: The ice melting device is arranged on a mobile vehicle, and comprises an ice melting switch box (3), an ice melting transformer (1), a protection system and a wireless temperature measurement system; the protection system comprises a control background, a transformer protection device (19), a feeder protection device (22) and a switch (20); the wireless temperature measurement system is connected with the feeder protection device (22) through a control line, and each wireless temperature measurement sensor is fixed on an ice melting overhead line (30); the ice melting switch box (3) comprises circuit breakers (6), voltage transformers (7), current transformers (13), fuses (14) and a shell current transformer (10); one circuit breaker (6) is connected between an output power supply of a substation (29) and an A end of the ice melting transformer (1), an X end of the ice melting transformer (1) is connected with a centralized grounding box of the substation (29); another circuit breaker (6) is connected between an a end of the ice melting transformer (1) and an uplink T line of the ice melting overhead line (30), a downlink T line of the ice melting overhead line (30) is connected with the x end of the ice melting transformer (1), and the x end of the ice melting transformer (1) is connected with the centralized grounding box of the substation (29); one end of a primary terminal of one current transformer (13) is connected in series on a connecting bus of the circuit breaker (6) and the ice melting transformer (1), and a secondary terminal thereof is connected with a current measurement terminal of the transformer protection device (19); a primary terminal of another current transformer (13) is connected in series on a connecting bus of another circuit breaker (6) and the ice melting transformer (1), and a secondary terminal thereof is connected with a current measurement terminal of the feeder protection device (22); a primary terminal of the shell current transformer (10) is connected in series on a grounding bus of the ice melting switch box (3), and a secondary terminal thereof is connected with another current measurement terminal of the transformer protection device (19); one end of a primary terminal of the voltage transformer (7) is connected with the a end of the ice melting transformer (1) after being connected in series with the fuse (14), and the other end is grounded, and a secondary terminal thereof is connected with a voltage measurement terminal of the feeder protection device (22).

2. The mobile ice-melting device for overhead contact line according to claim 1, characterized in that: The ice melting transformer (1) comprises an oil-immersed single-phase transformer, a tap changer (11) installed on a low-voltage winding of the oil-immersed single-phase transformer, a gear controller (18), a pressure detector (27) and a temperature sensor (28); a motor of the tap changer (11) is connected with the gear controller (18) through a control line; the gear controller (18) is connected with the transformer protection device (19) through a network; the pressure detector (27) and the temperature sensor (28) are connected with the transformer protection device (19) through control lines.

3. The mobile ice-melting device for overhead contact lines according to claim 1 or 2, characterized in that: The wireless temperature measurement system further comprises a temperature data processor (17) connected with the feeder protection device (22) through a control line; the wireless temperature measurement sensor comprises a temperature sensing chip (24), a signal repeater (23) and a photovoltaic power generation module (25); the temperature sensing chip (24) is connected on the ice melting overhead line (30), a signal output end of the temperature sensing chip (24) is connected with the signal repeater (23), and the signal repeater (23) is connected with the temperature data processor (17) through a network.

4. The mobile ice-melting device for overhead contact line according to claim 3, characterized in that: The ice melting device further comprises a lightning arrester (26) which is connected at one end to the a end of the ice melting transformer (1) and grounded at the other end.

5. The mobile ice-melting device for overhead contact line according to claim 4, characterized in that: The ice melting device further comprises a control cabinet (9) which is fixed in the ice melting switch box (3); the circuit breaker (6) and the voltage transformer (7) are both fixed on the base of the ice melting switch box (3); the transformer protection device (19), the feeder protection device (22), the switch (20), the gear controller (18) and the temperature data processor (17) are fixed in the control cabinet (9).

6. The mobile ice-melting device for overhead contact system according to claim 1 or 2, characterized in that: The ice melting device further comprises a lightning arrester (26) which is connected at one end to the a end of the secondary side of the ice melting transformer (1) and grounded at the other end.

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