Power system fault detection device

Abstract

The utility model discloses a power system fault detection device, and relates to the technical field of power detection, the power system fault detection device comprises a detection module and an automatic alarm module, and the output end of the detection module is electrically connected with the input end of the automatic alarm module; the detection module comprises a temperature detection module and an image detection module, the temperature detection module is used for detecting contact point temperature information of a circuit breaker of the high-voltage switch cabinet, and the image detection module is used for acquiring discharge image identification information of the contact point of the circuit breaker of the high-voltage switch cabinet; the automatic alarm module comprises a liquid crystal display, an MCU controller and an alarm module, the alarm module is used for indicating and alarming faults, and the detection module, the liquid crystal display and the alarm module are electrically connected with the MCU controller. And a control loop is cut off in time when a fault occurs, so that the power utilization process is safer.

Description

Technical Field

[0001] The present application relates to the technical field of power detection, and in particular to a power system fault detection device. Background Art

[0002] High-voltage switchgear is a vital component of the power system, providing control and protection during power transformation, transmission, and distribution, and is crucial to its normal operation. However, due to environmental influences or the switchgear's inherently low protection level, various faults can occur, hindering normal power supply and even causing loss of life. Existing high-voltage switchgear fault detection systems are unable to provide early warnings or automatically remove faulty equipment from the power system. Consequently, they lack accurate fault monitoring. Utility Model Content

[0003] In view of this, the present application provides a power system fault detection device to solve the technical problems that the existing high-voltage cabinet fault detection system cannot issue an early warning at the beginning of the fault and automatically remove the faulty equipment from the power system, and lacks accurate fault monitoring.

[0004] To achieve the above object, the present invention provides the following technical solution: a power system fault detection device, comprising: a detection module and an automatic alarm module, wherein the output end of the detection module is electrically connected to the input end of the automatic alarm module;

[0005] The detection module includes a temperature detection module and an image detection module. The temperature detection module is used to detect the temperature information of the contact points of the circuit breaker of the high-voltage switch cabinet, and the image detection module is used to obtain the discharge image recognition information of the contact points of the circuit breaker of the high-voltage switch cabinet;

[0006] The automatic alarm module includes a liquid crystal display, an MCU controller and an alarm module. The alarm module is used to indicate and alarm faults. The detection module, the liquid crystal display and the alarm module are all electrically connected to the MCU controller.

[0007] Furthermore, the temperature detection module includes a thermistor RT and a signal processing circuit. The temperature detection module is arranged in the contact arm of the trolley-type circuit breaker. The signal processing circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a reference voltage source U1, a capacitor C1, an operational amplifier A1 and an operational amplifier A2. The output end of the reference voltage source U1 is connected in parallel with one end of the resistor R1 and one end of the resistor R2, and the other end of the resistor R1 is connected in parallel with one end of the thermistor RT and one end of the resistor R3. The other end of 3 is connected to one end of capacitor C1 and the negative electrode of op amp A1. The other end of capacitor C1 is connected in parallel with the other end of thermistor RT, the output end of op amp A1 and one end of resistor R6. The other end of resistor R2 is connected in parallel with the positive electrode of op amp A1 and one end of resistor R4. The other end of resistor R4 is connected in series with resistor R5. The other end of resistor R6 is connected in parallel with the negative electrode of op amp A2 and one end of resistor R7. The other end of resistor R7 is connected in parallel with the output end of op amp A2 and then to the input end of the MCU controller. The positive electrode of op amp A2 is grounded through resistor R8.

[0008] Furthermore, the image detection module includes an image sensor and an image recognizer. The image sensor is arranged on the contact arm of the trolley-type circuit breaker. The image sensor and the image recognizer are electrically connected. The output end of the image recognizer is electrically connected to the signal input end of the MCU controller.

[0009] Furthermore, the automatic alarm module also includes a trip control circuit, which is electrically connected to the MCU controller. The trip control circuit includes a protection relay, which is electrically connected to the MCU controller.

[0010] Furthermore, the automatic alarm module also includes a control button, a function switch and a remote communication module; the control button, the function switch and the remote communication module are all electrically connected to the MCU controller.

[0011] Furthermore, the alarm module includes a voice alarm circuit and a light alarm circuit, the voice alarm circuit includes, the light alarm circuit includes a buzzer and a transistor drive circuit, the input end of the transistor drive circuit is electrically connected to the output end of the MCU controller, the output end of the transistor drive circuit is electrically connected to the buzzer, and the light alarm circuit includes an LED flashing light bar, which is electrically connected to the MCU controller through a connecting line.

[0012] It can be seen from the above technical solution that the advantages of the utility model are:

[0013] This application uses a combination of temperature detection and image detection modules to monitor contact failures between the handcart circuit breaker and the switchgear in real time. When an abnormality occurs, the MCU controller controls the alarm module to issue an on-site audible and visual alarm, as well as a remote alarm. This can promptly alert management personnel to potential safety hazards and improve fault detection accuracy. Furthermore, when a fault occurs, the control circuit can be promptly disconnected, enhancing electrical safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0015] Figure 1 The utility model is a schematic diagram of the composition structure of a power system fault detection device.

[0016] Figure 2 This is a schematic diagram of the circuit structure of the temperature detection module of the present utility model. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail in conjunction with the embodiments and drawings. Here, the illustrative embodiments of this application and their descriptions are used to explain this application, but are not intended to limit this application.

[0018] A single ultrasonic detection method or sensor detection method is difficult to distinguish between discharge and temperature anomalies of high-voltage switchgear circuit breakers, as well as the fault location. This application provides a power system fault detection device for accurately detecting and warning of circuit breaker contact faults in high-voltage switchgear, and realizing multi-mode warning interaction. Figures 1 to 2 The device includes a detection module and an automatic alarm module. The output of the detection module is electrically connected to the input of the automatic alarm module. The detection module includes a temperature detection module and an image detection module. The temperature detection module is used to detect the contact temperature of the circuit breaker of the high-voltage switchgear, and the image detection module is used to obtain discharge image recognition information of the circuit breaker contact points of the high-voltage switchgear. Excessive temperature at the circuit breaker contact points may be a sign of overload, poor contact, or aging. Prompt detection of temperature anomalies helps prevent fires and equipment damage. Similarly, discharge is a common failure mode in high-voltage switchgear and can also cause equipment damage or fire.

[0019] Specifically, if Figure 2As shown, the temperature detection module includes a thermistor RT and a signal processing circuit. The temperature detection module is arranged in the contact arm of the trolley-type circuit breaker near the plum blossom claw. The signal processing circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a reference voltage source U1, a capacitor C1, an operational amplifier A1 and an operational amplifier A2. The output end of the reference voltage source U1 is connected in parallel with one end of the resistor R1 and one end of the resistor R2, and the other end of the resistor R1 is connected in parallel with one end of the thermistor RT and one end of the resistor R3. The other end of resistor R3 is connected to one end of capacitor C1 and the negative electrode of op amp A1. The other end of capacitor C1 is connected in parallel to the other end of thermistor RT, the output end of op amp A1 and one end of resistor R6. The other end of resistor R2 is connected in parallel to the positive electrode of op amp A1 and one end of resistor R4. The other end of resistor R4 is connected in series with resistor R5. The other end of resistor R6 is connected in parallel to the negative electrode of op amp A2 and one end of resistor R7. The other end of resistor R7 is connected in parallel to the output end of op amp A2 and then to the input end of MCU controller. The positive electrode of op amp A2 is grounded through resistor R8. Figure 2 In the circuit shown, resistor R5 is an adjustable resistor. When a +5V reference voltage UREF is applied to the bridge circuit formed by resistors R1, R2, and R3, a constant current flows through thermistor RT. When the bridge circuit is balanced, R5 is adjusted to ensure the output voltage is zero at an ambient temperature of 0°C. As the temperature rises, the resistance of RT increases, generating a negative voltage. This voltage is then amplified by op amp A2, which then outputs the filtered and amplified detection voltage to the MCU controller.

[0020] The image detection module includes an image sensor and an image recognizer. The image sensor is mounted on the contact arm of the trolley-type circuit breaker and is electrically connected to the image recognizer. The output of the image recognizer is electrically connected to the signal input of the MCU controller. The image sensor is a miniature camera, and the image recognizer is a Raspberry Pi control board. The image recognition method is based on existing partial discharge image recognition technology and is not within the scope of protection of this application.

[0021] When the detection module detects an abnormality (such as excessive temperature or discharge), the automatic alarm module will receive these signals and trigger the corresponding alarm mechanism. The automatic alarm module of this application includes a liquid crystal display, an MCU controller, and an alarm module. The alarm module is used to indicate and alarm the fault. The detection module, liquid crystal display, and alarm module are all electrically connected to the MCU controller. The liquid crystal display is used to display the alarm parameters and fault status. The alarm method is implemented through sound, light, and remote communication means to ensure that relevant personnel can quickly receive and respond to the alarm, which can reduce the downtime and maintenance costs caused by equipment failure, while improving personnel safety.

[0022] Specifically, the automatic alarm module also includes a trip control circuit and the automatic alarm module includes a liquid crystal display, an MCU controller and an alarm module. The alarm module is used to indicate and alarm the fault, and the detection module, the liquid crystal display and the alarm module are all electrically connected to the MCU controller. The trip control circuit includes a protection relay, which is electrically connected to the MCU controller. The protection relay is arranged on the opening and closing circuit. When a fault occurs in the circuit, the protection relay is controlled to trip the corresponding switch. Among them, the alarm module includes a voice alarm circuit and a light alarm circuit. The voice alarm circuit includes, the light alarm circuit includes a buzzer and a transistor drive circuit, the input end of the transistor drive circuit is electrically connected to the output end of the MCU controller, the output end of the transistor drive circuit is electrically connected to the buzzer, and the light alarm circuit includes an LED flashing light bar, which is electrically connected to the MCU controller via a connecting line. The transistor drive circuit uses a conventional buzzer drive circuit, typically consisting of a first resistor, a second resistor, and a transistor. One end of the first resistor is electrically connected to an I / O terminal of the MCU controller, the other end of the first resistor is electrically connected to one end of the second resistor and the base of the transistor, the other end of the second resistor is connected in parallel with the emitter of the transistor and then to ground, and the collector of the transistor is electrically connected to one end of the buzzer, thereby controlling the operation of the buzzer. The MCU controller is an STM32F103C8T6.

[0023] In this embodiment, the automatic alarm module also includes a control button, a function switch, and a remote communication module; all of which are electrically connected to the MCU controller. After the fault is rectified, the control button is used to disconnect the protective relay. The function switch controls the alarm mode, allowing selection of either a single audible and visual alarm or a combined audible and visual alarm mode.

[0024] When this device is in operation, the detection module continuously monitors the status of the trolley-type circuit breakers in the high-voltage switchgear. If the temperature detection module or the image detection module detects an anomaly, it sends this information to the automatic alarm module, which triggers the alarm mechanism. Upon receiving the alarm, relevant personnel take necessary maintenance measures. By integrating temperature detection and image detection functions, this device achieves comprehensive monitoring of the high-voltage switchgear circuit breaker status, and the automatic alarm mechanism improves the timeliness and accuracy of fault response.

[0025] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will appreciate that various modifications and variations of the present embodiment are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A power system fault detection device, characterized in that: include: A detection module and an automatic alarm module, wherein the output end of the detection module is electrically connected to the input end of the automatic alarm module; The detection module includes a temperature detection module and an image detection module. The temperature detection module is used to detect the temperature information of the contact points of the circuit breaker of the high-voltage switch cabinet, and the image detection module is used to obtain the discharge image recognition information of the contact points of the circuit breaker of the high-voltage switch cabinet; The automatic alarm module includes a liquid crystal display, an MCU controller and an alarm module. The alarm module is used to indicate and alarm a fault. The detection module, the liquid crystal display and the alarm module are all electrically connected to the MCU controller.

2. The power system fault detection device according to claim 1, characterized in that: The temperature detection module includes a thermistor RT and a signal processing circuit. The temperature detection module is arranged in the contact arm of the trolley-type circuit breaker. The signal processing circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a reference voltage source U1, a capacitor C1, an operational amplifier A1 and an operational amplifier A2. The output end of the reference voltage source U1 is connected in parallel with one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R1 is connected in parallel with one end of the thermistor RT and one end of the resistor R3, and the other end of the resistor R3 is connected in parallel with the capacitor C1. One end of C1 is connected to the negative electrode of the operational amplifier A1, the other end of the capacitor C1 is connected in parallel to the other end of the thermistor RT, the output end of the operational amplifier A1, and one end of the resistor R6, the other end of the resistor R2 is connected in parallel to the positive electrode of the operational amplifier A1 and one end of the resistor R4, the other end of the resistor R4 is connected in series with a resistor R5, the other end of the resistor R6 is connected in parallel to the negative electrode of the operational amplifier A2 and one end of the resistor R7, the other end of the resistor R7 is connected in parallel to the output end of the operational amplifier A2 and then to the input end of the MCU controller, and the positive electrode of the operational amplifier A2 is grounded through the resistor R8.

3. The power system fault detection device according to claim 1, wherein: The image detection module includes an image sensor and an image recognizer. The image sensor is arranged on the contact arm of the trolley-type circuit breaker. The image sensor and the image recognizer are electrically connected. The output end of the image recognizer is electrically connected to the signal input end of the MCU controller.

4. The power system fault detection device according to claim 1, wherein: The automatic alarm module further includes a trip control circuit, which is electrically connected to the MCU controller. The trip control circuit includes a protection relay, which is electrically connected to the MCU controller.

5. The power system fault detection device according to claim 1, wherein: The automatic alarm module also includes a control button, a function switch and a remote communication module; the control button, the function switch and the remote communication module are all electrically connected to the MCU controller.

6. The power system fault detection device according to claim 5, characterized in that: The alarm module includes a voice alarm circuit and a light alarm circuit, the voice alarm circuit includes, the light alarm circuit includes a buzzer and a transistor drive circuit, the input end of the transistor drive circuit is electrically connected to the output end of the MCU controller, the output end of the transistor drive circuit is electrically connected to the buzzer, the light alarm circuit includes an LED flashing light bar, and the LED flashing light bar is electrically connected to the MCU controller through a connecting line.

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