A power distribution device detector

Abstract

This utility model relates to the field of power distribution device testing technology, and discloses a power distribution device tester, including a main switch, a tester driver board, a voltage conversion circuit, multiple reference voltage generation circuits, and multiple indicator light circuits. The main switch is electrically connected to a power input module. The test modules include modules for phase loss protection testing, phase failure testing, phase reversal function testing, overvoltage and overcurrent fault testing, and protection function testing. The protection function testing modules include leakage voltage protection testing, leakage current protection testing, grounding alarm protection testing, and insulation resistance protection testing. In this utility model, through the coordinated work of each module, the tester can realize automated detection, fault identification, and protection control of power distribution devices. When a fault occurs, it can quickly trigger protection actions to ensure the safety of personnel and equipment, improve detection efficiency and accuracy, and is widely applicable to scenarios such as industrial power monitoring and building power distribution system maintenance.

Description

Technical Field

[0001] This utility model relates to the field of power distribution device testing technology, and in particular to a power distribution device testing instrument. Background Technology

[0002] With the development of the power industry, a large number of distribution terminal equipment are aging and gradually entering the end of their lifespan. For example, early-installed distribution terminal equipment has been in operation for over ten years, and its failure rate is increasing year by year. Problems such as wear and tear of electrical components and deterioration of insulation performance are frequent, affecting distribution automation functions and reducing power supply reliability and service quality. There is an urgent need for professional testing equipment to promptly detect potential equipment problems; therefore, it is necessary to develop a distribution device testing instrument.

[0003] A power distribution device detector is a professional instrument used to test related equipment and lines in a power distribution system. It can monitor the operating parameters of the power distribution device in real time, such as voltage, current, and frequency. When abnormal voltage fluctuations or current overloads occur, it provides timely warnings and takes measures to prevent power outages or equipment damage caused by these problems, thus ensuring the continuity and stability of the power supply. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a power distribution device detector, which aims to improve the personnel safety issues that may arise when using power distribution device detectors in the prior art.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a power distribution device detector, comprising a main switch, a detector driver board, a voltage conversion circuit, multiple reference voltage generation circuits, and multiple indicator light circuits. The main switch is electrically connected to a power input module, which is electrically connected to a test module. The test module includes modules for phase loss protection testing, phase failure testing, phase reversal function testing, overvoltage and overcurrent fault testing, and protection function testing. The protection function testing module includes leakage voltage protection testing, leakage current protection testing, grounding alarm protection testing, and insulation resistance protection testing. The test module is electrically connected to a sensor module, which includes a voltage sensor and a current sensor. The sensor module is electrically connected to a signal processing module, which is electrically connected to a threshold comparison module. The threshold comparison module is electrically connected to a protection logic module, which includes leakage current protection logic, leakage voltage protection logic, overcurrent protection logic, overvoltage protection logic, and undervoltage protection logic. The protection logic module is electrically connected to a protection action execution module, which is signal-connected to a recovery module, a power cut-off module, and an alarm module.

[0006] Through the above technical solution: After the main switch is closed, power enters the detector through the power input module. The power input module distributes power to the test module and other related modules, providing operating power for the entire detector. The test module has multiple testing functions, capable of comprehensively detecting potential faults in the power distribution device such as phase loss, phase reversal, overvoltage, overcurrent, and leakage, ensuring the safe operation of the power distribution device. The sensor module can accurately collect voltage and current signals, which, after processing by the signal processing module, can be compared with standard thresholds through the threshold comparison module, providing an accurate basis for fault judgment. Then, the protection logic module intelligently judges the fault according to preset logic, directing the protection action execution module, linkage recovery module, power cut-off module, and alarm module to achieve graded fault handling and ensure the safety of equipment and personnel.

[0007] As a further description of the above technical solution:

[0008] The power input module has an input power connector for 380V AC mains power. Its output connectors include a 380V self-generated power connector, a 380V AC mains connector, a 220V AC mains connector, and a battery input connector, used to connect to the input interface of a power distribution device tester. The power input module also has an input connector for a 380V multi-function power supply connector, a 380V fast charger connector, a 380V high-pressure air compressor connector, an external tool connector, and a comprehensive tester connector, used to connect to the output interface of the power distribution device tester.

[0009] Through the above technical solutions, the aviation plug interface achieves physical isolation of power connections to a certain extent, reduces electromagnetic interference between different power supplies and modules, and improves the electromagnetic compatibility of the circuit. At the same time, the reasonable interface layout and connection method help avoid faults such as short circuits during power access and conversion, ensuring the safe and stable operation of the entire power distribution device tester power supply system. Furthermore, the existence of multiple power input methods and interfaces constitutes redundant backup of power supply. When one power supply fails or becomes unavailable, it can be quickly switched to other backup power supplies to ensure uninterrupted operation of the tester, thereby enhancing the reliability and stability of the system.

[0010] As a further description of the above technical solution:

[0011] The detector driver board is equipped with multiple driver interfaces CN1, CN2, CN4, CN5, CN6, and CN7 for connecting external power supplies, sensors, and actuators.

[0012] The above technical solutions can be flexibly adapted to various testing scenarios, support different power inputs and device expansion, and facilitate quick installation and maintenance through standardized interface design, thereby improving the versatility of the testing instrument.

[0013] As a further description of the above technical solution:

[0014] The detector driver board includes a driver circuit composed of transistors Q1, Q2, Q3, and Q4, and a signal amplification and processing circuit composed of operational amplifiers U1A, U1B, U1C, and U1D.

[0015] The above technical solution provides sufficient driving capability through the driving circuit to ensure reliable operation of the device, and improves the signal-to-noise ratio through the signal amplification and processing circuit to avoid misjudgment caused by signal distortion, thus providing a basis for accurate triggering of subsequent protection logic.

[0016] As a further description of the above technical solution:

[0017] The detector driver board includes an indicator circuit composed of light-emitting diodes and a rectifier circuit connected with a filter capacitor.

[0018] The above technical solutions enable the LEDs to help locate fault types, allowing operators to quickly grasp the equipment's operating status and shorten troubleshooting time. The rectifier circuit and filter capacitors provide a clean DC operating voltage for modules such as the driver board and sensors, ensuring circuit stability and reducing the impact of power supply interference on detection accuracy.

[0019] As a further description of the above technical solution:

[0020] The voltage conversion circuit consists of a voltage regulator U2, a filter capacitor EC1, and a filter capacitor EC2.

[0021] Through the above technical solution, the voltage conversion circuit can provide reliable power to the driver board, operational amplifier, reference voltage generation circuit, etc., avoid module failure or detection error caused by voltage fluctuations, and support multiple voltage level outputs to meet the power supply needs of different circuits.

[0022] As a further description of the above technical solution:

[0023] Each of the aforementioned reference voltage generation circuits consists of a Zener diode, a resistor, a variable resistor, and is connected to a capacitor.

[0024] Through the above technical solution, the reference voltage generation circuit can provide an accurate reference voltage for the threshold comparison module, serving as a benchmark for determining whether the power distribution device is abnormal.

[0025] As a further description of the above technical solution:

[0026] Each of the indicated circuits consists of a light-emitting diode, a diode, and a resistor, and is connected to a relay.

[0027] The above technical solution enables visualization of the detection process, and the connected relays allow the indicator circuit to perform protective actions in conjunction with the system, thereby improving the system response speed.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, through the coordinated work of each module, the detector can realize automated detection, fault identification and protection control of power distribution devices. When a fault occurs, it can quickly trigger protection actions to ensure the safety of personnel and equipment, improve detection efficiency and accuracy, and is widely applicable to scenarios such as industrial power monitoring and building power distribution system maintenance.

[0030] 2. In this utility model, the signal processing circuit of the driver board works in conjunction with the reference voltage generation circuit to ensure accurate acquisition and comparison of parameters such as voltage and current. The human-machine interaction experience is improved through the indicator circuit and standardized interface design, and the voltage conversion and filtering circuit ensures the stable operation of the entire system. Attached Figure Description

[0031] Figure 1 This is a schematic block diagram of the structure of a power distribution device detector proposed in this utility model;

[0032] Figure 2 This utility model provides a block diagram of the test module composition of a power distribution device detector.

[0033] Figure 3 This utility model presents a block diagram of the protection function testing module of a power distribution device detector.

[0034] Figure 4 This utility model provides a block diagram of the protection logic module of a power distribution device detector.

[0035] Figure 5 This is an electrical schematic diagram of a power distribution device detector proposed in this utility model;

[0036] Figure 6 This is a circuit connection diagram of the drive board of a power distribution device detector proposed in this utility model;

[0037] Figure 7 This is a voltage conversion circuit connection diagram for a power distribution device detector proposed in this utility model;

[0038] Figure 8 This invention provides a circuit diagram of the reference voltage board for a power distribution device detector. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] Reference Figures 1-4 This utility model provides an embodiment of a power distribution device detector, comprising a main switch, a detector driver board, a voltage conversion circuit, multiple reference voltage generation circuits, and multiple indicator light circuits. The main switch is electrically connected to a power input module, which is electrically connected to a test module. The test module includes modules for phase loss protection testing, phase failure testing, phase reversal function testing, overvoltage and overcurrent fault testing, and protection function testing. The protection function testing module includes modules for leakage voltage protection testing, leakage current protection testing, grounding alarm protection testing, and insulation resistance protection testing. The test module is electrically connected to a sensor module, which includes a voltage sensor and a current sensor. The sensor module is electrically connected to a signal processing module, which is electrically connected to a threshold comparison module. The threshold comparison module is electrically connected to a protection logic module, which includes leakage current protection logic, leakage voltage protection logic, overcurrent protection logic, overvoltage protection logic, and undervoltage protection logic. The protection logic module is electrically connected to a protection action execution module, which is signal-connected to a recovery module, a power cut-off module, and an alarm module.

[0041] Specifically, the main switch serves as the starting point for power control of the entire system. Its closing or opening operation controls whether the power input module can receive external power. This module is responsible for introducing external power, performing preliminary processing and distribution, and providing a stable and reliable power input for subsequent modules. The testing module performs comprehensive functional and fault detection on the power distribution equipment, covering various fault types, and promptly identifies potential faults and problems. After a fault test, the power distribution equipment's reset button must be pressed before proceeding to the next test. The current and voltage sensors in the sensor module accurately collect voltage, current, and other signals from the power distribution equipment, providing raw data for subsequent signal processing and analysis. According to reports, the signal processing module can process the signals collected by the sensors, remove interference, amplify signals, and improve signal quality, facilitating subsequent threshold comparison and analysis. The threshold comparison module compares the processed signal with preset thresholds to quickly and accurately determine whether there are any abnormalities, providing a basis for judgment for the protection logic module. The protection logic module can analyze and judge according to preset logic rules based on the threshold comparison results, determine the fault type, and issue corresponding instructions to achieve intelligent protection of the power distribution equipment. The protection action execution module can execute specific protection actions, such as cutting off the power supply and issuing alarms, according to the instructions of the protection logic module, to prevent the fault from escalating and ensure the safety of the power distribution equipment and personnel.

[0042] Reference Figure 1 , Figure 5 The power input module has an input power connector for 380V AC mains power. Its output connectors include a 380V self-generated power connector, a 380V AC mains connector, a 220V AC mains connector, and a battery input connector, used to connect to the input interface of the power distribution device tester. The power input module also has an input connector for a 380V multi-function power supply connector, a 380V fast charger connector, a 380V high-pressure air compressor connector, an external tool connector, and a comprehensive tester connector, used to connect to the output interface of the power distribution device tester.

[0043] Specifically, the power input interface can connect to 380V AC mains power, while the output interfaces include a self-generated 380V interface, a AC mains 380V interface, a AC mains 220V interface, and a battery input interface. This allows the power distribution device tester to flexibly adapt to different power sources. For example, it can use AC mains power when available, and switch to self-generated or battery power in outdoor or other scenarios without AC mains power, ensuring that the tester can obtain power in various environments and improving its flexibility and adaptability. The input interfaces include a multi-functional power supply 380V interface, a fast charger 380V interface, a high-pressure air compressor 380V interface, an external tool interface, and a comprehensive tester interface, which can easily connect to the various functional modules inside the power distribution device tester. This achieves effective docking between the power input module and modules such as the multi-functional power supply and fast charger, providing precise power to each module and enabling them to work together to complete tasks such as testing power distribution devices.

[0044] Reference Figure 6 The detector driver board is equipped with multiple driver interfaces CN1, CN2, CN4, CN5, CN6, and CN7 for connecting external power supplies, sensors, and actuators. The detector driver board includes a driver circuit composed of transistors Q1, Q2, Q3, and Q4; a signal amplification and processing circuit composed of operational amplifiers U1A, U1B, U1C, and U1D; and an indicator circuit composed of light-emitting diodes and a rectifier circuit connected to filter capacitors.

[0045] Specifically, the driver interface of the detector driver board serves as the connection hub for external devices, enabling electrical connections with external power sources such as AC power, batteries, voltage sensors, current sensors, relays, alarm modules, and other actuators. The switching characteristics of transistors amplify control signals to drive loads such as relays and actuators, achieving logical control of the detection process, such as starting the test and cutting off the power. Signal amplification and processing circuits amplify the weak analog signals output by voltage and current sensors to a range that subsequent circuits can process. The on / off state or color change of LEDs visually displays the detector's operating status. A rectifier circuit converts AC power, such as the input AC power, into DC power for use by subsequent circuits. A filter circuit smooths voltage fluctuations after rectification, reduces ripple, and provides a stable DC power supply.

[0046] Reference Figure 7 , Figure 8 The voltage conversion circuit consists of a voltage regulator U2, a voltage regulator U2, and filter capacitors EC1 and EC2; each reference voltage generation circuit consists of a Zener diode, a resistor, and a variable resistor, and is connected to a capacitor; each indicator circuit consists of a light-emitting diode, a diode, and a resistor, and is connected to a relay.

[0047] Specifically, the voltage conversion circuit uses a voltage regulator to convert the input power, such as 380V / 220V AC mains or battery voltage, into a stable low-voltage DC power supply required by each module. Then, a filter capacitor further filters out high-frequency noise to ensure the stability and purity of the output voltage. The reference voltage generation circuit uses the reverse breakdown characteristic of the Zener diode, combined with resistor voltage division and variable resistor adjustment, to generate a stable reference voltage. Then, a capacitor is used to filter out high-frequency noise in the reference voltage to ensure a constant voltage value. The LED in the indicator circuit can provide real-time feedback on the detection status through light indication. The diode uses its unidirectional conductivity to prevent current from flowing backward. In the indicator circuit, the main function is to protect the LED from damage due to excessive reverse voltage. Then, a resistor limits the current to protect the LED from burning out. Finally, in conjunction with the protection logic module, a relay triggers an alarm or cuts off the power supply through contact action in case of a fault.

[0048] Working Principle: During use, after the main switch is closed, 380V AC power is connected through the input connector of the power input module. The power input module can directly output 380V AC power through the 380V AC interface; alternatively, it can convert the input power to output 220V through the 220V AC interface, or connect a battery for power via the battery input interface. The power input module also connects to internal modules such as multi-function power supplies, fast chargers, and high-pressure air compressors through the input connector, providing them with suitable power to ensure their normal operation and support for testing. The power input module then distributes the processed power to the test modules, and the various test functions within the test modules begin operating. During the test, the sensor module's power... Voltage and current sensors collect voltage and current signals from the power distribution unit in real time. These signals are transmitted to the signal processing module for amplification, filtering, and other processing to make them standard signals. The processed signals are then sent to the threshold comparison module for comparison with preset normal voltage and current thresholds. The threshold comparison module transmits the comparison result to the protection logic module. The protection logic module makes judgments based on rules such as leakage current protection logic and overvoltage protection logic. Then, the protection action module attempts to automatically recover from the fault according to the instructions issued by the protection logic module, reducing the power outage time caused by the fault and improving the availability and reliability of the power distribution unit. If recovery is not possible, the power cut-off module cuts off the power supply to the power distribution unit, and at the same time, the alarm module is triggered to issue an alarm.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A distribution device detector, comprising a main switch, a detector driving board, a voltage conversion circuit, a plurality of reference voltage generating circuits, a plurality of indicator light circuits, characterized in that: The main switch is electrically connected to a power input module, which is electrically connected to a test module. The test module includes modules for phase loss protection testing, phase failure testing, phase reversal function testing, overvoltage and overcurrent fault testing, and protection function testing. The protection function testing module includes modules for leakage voltage protection testing, leakage current protection testing, grounding alarm protection testing, and insulation resistance protection testing. The test module is electrically connected to a sensor module, which includes a voltage sensor and a current sensor. The sensor module is electrically connected to a signal processing module, which is electrically connected to a threshold comparison module. The threshold comparison module is electrically connected to a protection logic module, which includes leakage current protection logic, leakage voltage protection logic, overcurrent protection logic, overvoltage protection logic, and undervoltage protection logic. The protection logic module is electrically connected to a protection action execution module, which is signal-connected to a recovery module, a power cut-off module, and an alarm module.

2. The power distribution device detector of claim 1, wherein: The power input module has an input power connector for 380V AC mains power. Its output connectors include a 380V self-generated power connector, a 380V AC mains connector, a 220V AC mains connector, and a battery input connector, used to connect to the input interface of a power distribution device tester. The power input module also has an input connector for a 380V multi-function power supply connector, a 380V fast charger connector, a 380V high-pressure air compressor connector, an external tool connector, and a comprehensive tester connector, used to connect to the output interface of the power distribution device tester.

3. The power distribution device detector of claim 1, wherein: The detector driver board is equipped with multiple driver interfaces CN1, CN2, CN4, CN5, CN6, and CN7 for connecting external power supplies, sensors, and actuators.

4. The power distribution device detector of claim 1, wherein: The detector driver board includes a driver circuit composed of transistors Q1, Q2, Q3, and Q4, and a signal amplification and processing circuit composed of operational amplifiers U1A, U1B, U1C, and U1D.

5. The power distribution device detector of claim 1, wherein: The detector driver board includes an indicator circuit composed of light-emitting diodes and a rectifier circuit connected with a filter capacitor.

6. The power distribution device detector of claim 1, wherein: The voltage conversion circuit consists of a voltage regulator U2, a filter capacitor EC1, and a filter capacitor EC2.

7. The power distribution device detector of claim 1, wherein: Each of the aforementioned reference voltage generation circuits consists of a Zener diode, a resistor, a variable resistor, and is connected to a capacitor.

8. The power distribution device detector of claim 5, wherein: Each of the indicated circuits consists of a light-emitting diode, a diode, and a resistor, and is connected to a relay.

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