Open-phase protector with fault information storage function

Abstract

The utility model discloses an open-phase protector with a fault information storage function. The open-phase protector comprises an A-series open-phase protection circuit and a B-series open-phase protection circuit which are identical. The A-series open-phase protection circuit and the B-series open-phase protection circuit respectively comprise an input power conversion circuit, an input current sampling circuit, a signal processing circuit, an information storage circuit and an output control circuit which are connected to a three-phase alternating-current power supply, and the output end of the input power conversion circuit is connected with the input end of the input current sampling circuit; the output end of the input current sampling circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is respectively connected with the input ends of the signal processing circuit and the output control circuit, and the output end of the output control circuit is connected with the input end of the alternating current switch machine. According to the utility model, the fault can be recorded, the operation condition of the equipment can be conveniently known by calling the fault information record, and the troubleshooting work of the equipment is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of phase loss protector technology, and more specifically to a phase loss protector with fault information storage function. Background Technology

[0002] The phase loss protector for railway signaling is a specialized device used in the protection and control circuit of AC switch machines to protect against phase loss and time delays in AC switch machines. When the AC switch machine experiences power outages, load phase loss, or load timeouts, the phase loss protector will cut off the AC switch machine's power supply, thus providing fault protection.

[0003] Existing phase loss protectors for railway signals can protect against faults such as power outages, load phase loss, and load timeouts when the AC switch machine input power supply is interrupted. However, they do not store past faults. If the fault recovers on its own, the phase loss protector continues to work normally, making it impossible to query past faults and hindering the inspection of equipment operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a phase loss protector with fault information storage function, which can record the faults that have occurred, so as to facilitate equipment fault diagnosis.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A phase-loss protector with fault information storage function includes two identical A-system phase-loss protection circuits and B-system phase-loss protection circuits. The input terminals of the A-system and B-system phase-loss protection circuits are respectively connected to an input power supply, and the output terminals of the A-system and B-system phase-loss protection circuits are respectively connected to the input terminals of an AC switch machine. Each of the A-system and B-system phase-loss protection circuits includes an input power conversion circuit connected to a three-phase AC power supply for converting the three-phase AC power supply to DC power, an input current sampling circuit for sampling the input circuit signal, a signal processing circuit for logical analysis of the sampling point information, an information storage circuit for storing the collected error information, and an output control circuit for outputting a signal to the AC switch machine. The output terminal of the input power conversion circuit is connected to the input terminal of the input current sampling circuit, the output terminal of the input current sampling circuit is connected to the input terminal of the signal processing circuit, the output terminal of the signal processing circuit is connected to the input terminals of both the signal processing circuit and the output control circuit, and the output terminal of the output control circuit is connected to the input terminal of the AC switch machine.

[0007] To further optimize the technical solution, the A-series phase failure protection circuit and the B-series phase failure protection circuit also include a status indication circuit for indicating the operating status of the phase failure protector. The input terminal of the status indication circuit is connected to the output terminal of the signal processing circuit.

[0008] To further optimize the technical solution, the A-series phase loss protection circuit and the B-series phase loss protection circuit also include an alarm circuit for issuing an alarm signal when there is an abnormal operation. The input terminal of the alarm circuit is connected to the output terminal of the signal processing circuit, and the output terminal of the alarm circuit is connected to the input terminal of the fault relay.

[0009] To further optimize the technical solution, the input power conversion circuit includes a transformer, a rectifier diode, and a linear regulator connected in sequence to the three-phase input power supply. The output terminal of the linear regulator is connected to the power input terminal of the signal processing circuit.

[0010] To further optimize the technical solution, the input current sampling circuit includes a current transformer and a voltage follower circuit connected to the three-phase input power supply, with the input terminal of the voltage follower circuit connected to the input terminal of the signal processing circuit.

[0011] To further optimize the technical solution, the information storage circuit includes a flash memory for storing error information, with the input terminal of the flash memory connected to the output terminal of the signal processing circuit.

[0012] To further optimize the technical solution, the output control circuit is a Darlington diode used to control the conduction state, and the output terminal of the Darlington diode is connected to the input terminal of the AC switch machine.

[0013] Due to the adoption of the above technical solutions, the technological progress achieved by this utility model is as follows.

[0014] This utility model provides a phase loss protector with fault information storage function. It adopts a dual-redundant design. When one system fails, the other system can ensure the normal operation of the system. Both systems are equipped with information storage circuits to record the faults that have occurred. By retrieving the fault information records, the operating status of the equipment can be easily understood, which facilitates the troubleshooting of the equipment. Attached Figure Description

[0015] Figure 1 This is a structural block diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the phase loss protection circuit of this utility model.

[0017] Figure 3 This is a circuit diagram of the input power conversion circuit of this utility model;

[0018] Figure 4This is a circuit diagram of the input current sampling circuit of this utility model;

[0019] Figure 5 This is a circuit diagram of the signal processing circuit of this utility model;

[0020] Figure 6 This is a circuit diagram of the output control circuit of this utility model;

[0021] Figure 7 This is a circuit diagram of the status indication circuit of this utility model;

[0022] Figure 8 This is a circuit diagram of the alarm circuit of this utility model. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] A phase loss protector with fault information storage function, combined with Figure 1 As shown, it includes two identical A-system phase failure protection circuits and B-system phase failure protection circuits. The input terminals of the A-system phase failure protection circuit and the B-system phase failure protection circuit are respectively connected to the input power supply, and the output terminals of the A-system phase failure protection circuit and the B-system phase failure protection circuit are respectively connected to the input terminal of the AC switch machine.

[0025] The principle block diagrams of the A-series phase failure protection circuit and the B-series phase failure protection circuit are as follows: Figure 2 As shown, it includes an input power conversion circuit, an input current sampling circuit, a signal processing circuit, an information storage circuit, and an output control circuit. The output terminal of the input power conversion circuit is connected to the input terminal of the input current sampling circuit. The output terminal of the input current sampling circuit is connected to the input terminal of the signal processing circuit. The output terminal of the signal processing circuit is connected to the input terminals of the signal processing circuit and the output control circuit, respectively. The output terminal of the output control circuit is connected to the input terminal of the AC switch machine.

[0026] The input power conversion circuit transforms the input three-phase AC power into DC power that can be directly used by other components on the board. The circuit diagram of the input power conversion circuit is shown below. Figure 3 As shown, the system includes a transformer, rectifier diodes, and a linear regulator connected to the three-phase input power supply. The three-phase AC line voltage is converted into a low AC voltage by the transformer, then rectified into a DC voltage by the rectifier diodes. The rectified voltage is then regulated by the linear regulator to generate a stable DC power supply voltage. Part of this voltage is used in the output circuit; another part is stepped down by the power module to generate a power supply for operational amplifiers, relays, and other components. This power supply is then converted by the linear regulator to power the microcontroller and indicator lights.

[0027] The input current sampling circuit is used by the microcontroller to sample the input current signal and control the DC voltage output. The circuit diagram of the input current sampling circuit is shown below. Figure 4 As shown, it includes a current transformer and a voltage follower connected to a three-phase input power supply. When the current transformer collects the current signal, it reaches the sampleable voltage through the voltage follower circuit according to a predetermined ratio, and transmits the collected information to the microcontroller for logical judgment.

[0028] The signal processing circuit performs logical analysis and judgment on the various sampling points and information output by other unit circuits. The final output signal is fed back to other circuits. The circuit diagram of the signal processing circuit is shown below. Figure 5 As shown.

[0029] The information storage circuit includes a flash memory. The input terminal of the flash memory is connected to the output terminal of the signal processing circuit. It is based on the signal processing circuit sampling and analyzing different sampling points in the circuit, and then storing the collected error information through the flash memory. The fault information stored in this device mainly includes some common fault conditions, such as phase loss, timeout, and abnormal output voltage.

[0030] The output control circuit uses a Darlington diode to control the conduction state. The circuit diagram of the output control circuit is shown below. Figure 6 As shown, the main control chip inputs a signal to the output control circuit, realizing the process of mapping the software logic analysis onto the hardware circuit. When the diode is not conducting, there is no output DC voltage; when the diode is conducting, there is an output DC voltage. This enables the software to control the hardware.

[0031] The phase loss protection circuit also includes a status indication circuit and an alarm circuit. The status indication circuit indicates the operating status of the phase loss protector, and the alarm circuit issues an alarm when there is an abnormality in operation. The input terminals of the status indication circuit and the alarm circuit are respectively connected to the output terminals of the signal processing circuit. The circuit diagrams of the status indication circuit and the alarm circuit are shown below. Figure 7 and Figure 8 As shown, the phase loss protector is equipped with an operating light, a normal light, a fault light, an output current indicator light, and a power indicator light. The operating light indicates the internal program running status of the device, the normal light indicates the overall working status of the device, the fault light indicates the fault status of the device, the output current indicator light indicates the output current status, and the power indicator light indicates the power supply status of the main board.

[0032] This utility model adopts a dual-redundancy design, with the A-series and B-series phase failure protection circuits working simultaneously. When one system fails, the other system can still ensure the normal operation of the system. Both the A-series and B-series phase failure protection circuits are equipped with information storage circuits, which can record the faults that have occurred. By retrieving the fault information records, it is convenient to understand the equipment operation status and facilitate the troubleshooting of equipment faults.

Claims

1. A phase loss protector with fault information storage function, characterized in that: The system includes two identical A-system phase failure protection circuits and B-system phase failure protection circuits. The input terminals of the A-system and B-system phase failure protection circuits are respectively connected to the input power supply, and the output terminals of the A-system and B-system phase failure protection circuits are respectively connected to the input terminals of the AC switch machine. The A-system and B-system phase failure protection circuits each include an input power conversion circuit connected to the three-phase AC power supply to convert the three-phase AC power supply to DC power supply, an input current sampling circuit for sampling the input circuit signal, a signal processing circuit for logical analysis of the sampling point information, an information storage circuit for storing the collected error information, and an output control circuit for outputting signals to the AC switch machine. The output terminal of the input power conversion circuit is connected to the input terminal of the input current sampling circuit, the output terminal of the input current sampling circuit is connected to the input terminal of the signal processing circuit, the output terminal of the signal processing circuit is connected to the input terminals of the signal processing circuit and the output control circuit, and the output terminal of the output control circuit is connected to the input terminal of the AC switch machine.

2. A phase loss protector with fault information storage function according to claim 1, characterized in that: The A-series phase failure protection circuit and the B-series phase failure protection circuit also include a status indication circuit for indicating the operating status of the phase failure protector. The input terminal of the status indication circuit is connected to the output terminal of the signal processing circuit.

3. A phase loss protector with fault information storage function according to claim 1, characterized in that: The A-series phase loss protection circuit and the B-series phase loss protection circuit also include an alarm circuit for issuing an alarm signal when there is an abnormal operation. The input terminal of the alarm circuit is connected to the output terminal of the signal processing circuit, and the output terminal of the alarm circuit is connected to the input terminal of the fault relay.

4. A phase loss protector with fault information storage function according to claim 1, characterized in that: The input power conversion circuit includes a transformer, a rectifier diode, and a linear regulator connected in sequence to the three-phase input power supply. The output terminal of the linear regulator is connected to the power input terminal of the signal processing circuit.

5. A phase loss protector with fault information storage function according to claim 1, characterized in that: The input current sampling circuit includes a current transformer connected to the three-phase input power supply and a voltage follower circuit. The input terminal of the voltage follower circuit is connected to the input terminal of the signal processing circuit.

6. A phase loss protector with fault information storage function according to claim 1, characterized in that: The information storage circuit includes a flash memory for storing error information, and the input terminal of the flash memory is connected to the output terminal of the signal processing circuit.

7. A phase loss protector with fault information storage function according to claim 1, characterized in that: The output control circuit is a Darlington diode used to control the conduction state, and the output terminal of the Darlington diode is connected to the input terminal of the AC switch machine.

Images