An electric railway catenary switch monitoring device

Abstract

The utility model relates to an electrified railway contact network switch monitoring device is provided with backup power supply circuit, power failure monitoring circuit and backup power supply monitoring circuit on monitoring device power circuit, wherein: backup power supply circuit inserts DC24V power of power module PW1 output, backup power supply circuit has super capacitor, and super capacitor charges with DC24V power and supplies power to power module PW2 when AC220V power failure, and power failure monitoring circuit is used for monitoring the working condition of monitoring device power circuit, and backup power supply monitoring circuit is used for monitoring the working condition of backup power supply circuit. The utility model has the advantages that: the power failure control method can monitor device power failure state and backup power supply undervoltage state simultaneously, when device power failure, can be in time to the remote dispatch system upload power failure device working state, each telesignalling signal state and so on state information, improve the security when using monitoring device, and provide guarantee for making timely response when fault occurs.

Description

Technical Field

[0001] This utility model relates to the field of monitoring technology for overhead contact line switches in electrified railways, and in particular to a monitoring device for overhead contact line switches in electrified railways. Background Technology

[0002] Disconnecting switches for electrified railway catenary systems are used in applications such as power supply from traction substations to the catenary and catenary segmentation. There are currently two forms of monitoring for these catenary disconnecting switches: one involves installing a monitoring panel in the traction substation, with a monitoring device inside the disconnecting switch mechanism box, and the monitoring panel and device connected via optical fiber (generally referred to as fiber optic control); the other involves placing the monitoring device on the monitoring panel in the traction substation, moving the electronic and electrical components from the disconnecting switch mechanism box into the monitoring panel, and connecting the monitoring and disconnecting switch mechanism via several cables (generally referred to as direct cable control).

[0003] These two methods of monitoring disconnecting switches in electrified railway contact networks each have their own advantages and disadvantages. When fiber optic control is used, the substation monitoring screen and the disconnecting switch mechanism are connected by optical cable, and the power supply for each disconnecting switch mechanism and monitoring device is provided by the nearest AC power supply system. There are fewer connecting cables and the construction cost is lower. When direct cable control is used, the substation monitoring screen and the disconnecting switch mechanism are connected by multi-core cable. The disconnecting switch mechanism does not need to be powered separately. This method consumes more cables and has a higher construction cost.

[0004] In fiber optic control, the power supply system is not reliable because the disconnecting switch mechanism and monitoring device are supplied by AC power along the route. When the device loses power, the remote power dispatching system can only detect the communication failure of the device and cannot distinguish in time whether the device is losing power or has a fault. Summary of the Invention

[0005] The purpose of this utility model is to address the shortcomings of the prior art by providing a monitoring device for the overhead contact line switch of an electrified railway. When a power failure occurs, the monitoring device installed in the disconnector switch mechanism box should be equipped with a backup power supply so that when the device loses power, it has the opportunity to upload its working status and remote signaling status to a remote power dispatching system.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A monitoring device for an electrified railway overhead contact line switch includes a monitoring device inside a disconnector switch box. The monitoring device power supply circuit includes an electromagnetic compatibility (EMC) filter circuit, a power module PW1, a current-limiting filter circuit, and a power module PW2. The EMC filter circuit is powered by an external AC 220V power supply and is electrically connected to the power module PW1. The power module PW1 generates a DC 24V power supply, which is applied to the power module PW2 through the current-limiting filter circuit. The power module PW2 generates a DC 3.3V power supply for the MCU control circuit of the monitoring device. The device is characterized by having a backup power supply circuit, a power failure monitoring circuit, and a backup power monitoring circuit on its power supply circuit.

[0008] The backup power circuit is connected to the DC24V power output by the power module PW1. The backup power circuit has a supercapacitor. The supercapacitor is charged by the DC24V power and supplies power to the power module PW2 when the AC220V power fails.

[0009] The power failure monitoring circuit is connected to the DC24V power output of the power module PW1. It has an optocoupler, which outputs a corresponding low level or high level to the MCU of the monitoring device according to the normal state or power failure state of the AC220V power supply.

[0010] The backup power monitoring circuit is connected to the power output of the supercapacitor. It has an optocoupler, which outputs a corresponding low level or high level to the MCU of the monitoring device according to the normal or power failure state of the power output of the supercapacitor.

[0011] The backup power circuit includes a resistor R1, a diode D3, a diode D4, and the supercapacitor. The backup power circuit is connected to the DC24V power output from the power module PW1 through the resistor R1. The DC24V power continuously charges the supercapacitor through the current limiting of the resistor R1 and the unidirectional isolation of the diode D3. The power of the supercapacitor supplies power to the power module PW2 through the diode D4.

[0012] The power failure monitoring circuit includes a resistor R2 and an optocoupler O1. The power failure monitoring circuit is connected to the DC24V power output by the power module PW1 through the resistor R2. The optocoupler O1 outputs a low level or a high level according to the input voltage of the resistor R2.

[0013] The power failure monitoring circuit is set with a threshold of 13V.

[0014] The backup power monitoring circuit includes a resistor R4 and an optocoupler O2. The backup power monitoring circuit is connected to the power output of the supercapacitor through the resistor R4. The optocoupler O2 outputs a low level or a high level according to the input voltage of the resistor R4.

[0015] The backup power monitoring circuit is set with a threshold of 16V.

[0016] The advantages of this utility model are: the power failure control method can simultaneously monitor the power failure status of the device and the undervoltage status of the backup power supply. When the device loses power, it can promptly upload status information such as the device's working status and the status of various remote signaling signals to the remote dispatch system, thereby improving the safety of the monitoring device during use and providing a guarantee for timely response in the event of a fault. The structure is simple and reasonable and can be applied to the transformation and innovation of existing monitoring devices. Attached Figure Description

[0017] Figure 1 This is a system diagram of the present invention;

[0018] Figure 2 This is a functional block diagram of the present invention;

[0019] Figure 3 This is a functional block diagram of the power supply circuit of this utility model;

[0020] Figure 4 This is the circuit schematic diagram of this utility model;

[0021] Figure 5 This is a flowchart illustrating the usage of this utility model. Detailed Implementation

[0022] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0023] Example: Figure 1-5 As shown, the electrified railway contact network switch monitoring device in this embodiment should be equipped with a backup power supply through the monitoring device installed in the disconnector switch mechanism box. When the device loses power, it will have the opportunity to upload the working status and remote signaling status of the device when it loses power to the remote power dispatching system.

[0024] like Figure 4As shown, when the AC power supply to the monitoring device inside the isolating switch box is normal, the AC220V AC power first passes through the electromagnetic compatibility filter circuit composed of AC withstand voltage capacitor C1, varistor Y1, common mode filter L1, and AC withstand voltage capacitor C2, and then is applied to the power module PW1 to generate DC24V power. The DC24V power then passes through the isolation diode D1, through the current limiting filter circuit composed of electrolytic capacitor E1, electrolytic capacitor E2, and fuse F1, and then is applied to the power module PW2. After passing through the electrolytic capacitor E3, it generates DC3.3V power, which is used by the MCU control circuit of the monitoring device.

[0025] In the power supply circuit of the monitoring device, a backup power supply circuit is composed of resistor R1, diode D3, diode D4, and supercapacitor E4. When the AC220V power supply of the monitoring device is normal, power module PW1 outputs DC24V power. This power is continuously charged to supercapacitor E4 by diode D3 (which provides unidirectional isolation via diode D1, current limiting via resistor R1, and unidirectional isolation) until supercapacitor E4 is charged to approximately 24-1.4=22.6V. When the AC220V power supply of the monitoring device fails, the energy stored in supercapacitor E4 supplies power to power module PW2 through diode D4, enabling it to continuously generate DC3.3V power for the monitoring device's MCU control circuit. In this embodiment, supercapacitor E4 is grounded.

[0026] The power failure monitoring circuit consists of resistor R2, capacitor C3, Zener diode DW1, optocoupler O1, resistor R3, and capacitor C4. The circuit has a threshold voltage of 13V. It is connected to the DC 24V power supply output from power module PW1 via resistor R2. When the AC 220V power supply to the monitoring device is normal, the DC 24V input to resistor R2 is transmitted to optocoupler O1 through Zener diode DW1, causing optocoupler O1 to output a low level, which is then sent to the MCU for data acquisition. When the AC 220V power supply to the monitoring device fails, the input voltage to R2 is below 13V, and optocoupler O1 outputs a high level, again sent to the MCU for data acquisition. In this embodiment, optocoupler O1 uses resistor R3 to step down the output voltage. Capacitors C3 and C4 are used for grounding at two points in the power failure monitoring circuit.

[0027] The backup power monitoring circuit consists of resistor R4, capacitor C5, Zener diode DW2, optocoupler O2, resistor R5, and capacitor C6. The circuit has a 16V threshold and is connected to the power output of supercapacitor E4 via resistor R4. When supercapacitor E4 is powered normally, resistor R4 receives a DC 22.6V input, and optocoupler O2 outputs a low level, which is sent to the MCU for data acquisition. When the AC 220V power supply to the monitoring device fails, the input voltage to resistor R4 drops below 16V, and optocoupler O2 outputs a high level. In this embodiment, optocoupler O2 uses resistor R5 to step down the output voltage. Capacitors C5 and C6 are used for two grounding points in the backup power monitoring circuit.

[0028] In the specific implementation of this embodiment:

[0029] When both the "AC power failure" signal from the power failure monitoring circuit and the "backup power undervoltage" signal from the backup power monitoring circuit are low, it is determined that the AC power supply and the backup power supply are normal. The MCU of the isolating switch monitoring device normally collects remote signaling information, reports it to the remote power dispatching system, and normally responds to the remote control operation commands of the remote power dispatching system.

[0030] When the power failure monitoring circuit outputs a high level for "AC power failure" and the backup power monitoring circuit outputs a low level for "backup power undervoltage", it is determined that the AC power failure is normal and the backup power is normal. The MCU of the isolating switch monitoring device normally collects remote signaling information and reports it to the remote power dispatching system. It also normally receives remote control operation commands from the remote power dispatching system, but does not execute the remote control commands.

[0031] When both the "AC power failure" indicator from the power failure monitoring circuit and the "backup power undervoltage" indicator from the backup power monitoring circuit output a high level, it is determined that the AC power has failed normally and the backup power is about to run out. The MCU of the isolating switch monitoring device stops collecting and updating remote signaling information and stops receiving and processing remote control commands until the AC power is restored.

[0032] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A monitoring device for an electrified railway overhead contact line switch, comprising a monitoring device inside a disconnector switch box, the monitoring device having a power supply circuit, wherein the power supply circuit includes an electromagnetic compatibility filter circuit, a power module PW1, a current limiting filter circuit, and a power module PW2, wherein, The electromagnetic compatibility (EMC) filter circuit is powered by an external AC220V power supply. The EMC filter circuit is electrically connected to the power module PW1. The power module PW1 generates DC24V power, which is applied to the power module PW2 through the current-limiting filter circuit. The power module PW2 generates DC3.3V power for the MCU control circuit of the monitoring device. The monitoring device's power circuit is characterized by having a backup power supply circuit, a power failure detection circuit, and a backup power monitoring circuit, wherein: The backup power circuit is connected to the DC24V power output by the power module PW1. The backup power circuit has a supercapacitor. The supercapacitor is charged by the DC24V power and supplies power to the power module PW2 when the AC220V power fails. The power failure monitoring circuit is connected to the DC24V power output of the power module PW1. It has an optocoupler, which outputs a corresponding low level or high level to the MCU of the monitoring device according to the normal state or power failure state of the AC220V power supply. The backup power monitoring circuit is connected to the power output of the supercapacitor. It has an optocoupler, which outputs a corresponding low level or high level to the MCU of the monitoring device according to the normal or power failure state of the power output of the supercapacitor.

2. The monitoring device for the overhead contact line switch of an electrified railway according to claim 1, characterized in that: The backup power circuit includes a resistor R1, a diode D3, a diode D4, and the supercapacitor. The backup power circuit is connected to the DC24V power output from the power module PW1 through the resistor R1. The DC24V power continuously charges the supercapacitor through the current limiting of the resistor R1 and the unidirectional isolation of the diode D3. The power of the supercapacitor supplies power to the power module PW2 through the diode D4.

3. The monitoring device for the overhead contact line switch of an electrified railway according to claim 1, characterized in that: The power failure monitoring circuit includes a resistor R2 and an optocoupler O1. The power failure monitoring circuit is connected to the DC24V power output by the power module PW1 through the resistor R2. The optocoupler O1 outputs a low level or a high level according to the input voltage of the resistor R2.

4. A monitoring device for overhead contact line switches of an electrified railway according to claim 1 or 3, characterized in that: The power failure monitoring circuit is set with a threshold of 13V.

5. The monitoring device for the overhead contact line switch of an electrified railway according to claim 1, characterized in that: The backup power monitoring circuit includes a resistor R4 and an optocoupler O2. The backup power monitoring circuit is connected to the power output of the supercapacitor through the resistor R4. The optocoupler O2 outputs a low level or a high level according to the input voltage of the resistor R4.

6. A monitoring device for overhead contact line switches of an electrified railway according to claim 1 or 5, characterized in that: The backup power monitoring circuit is set with a threshold of 16V.

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