Medium-voltage power supply fault sensing and detecting device

Abstract

The utility model relates to a medium-voltage power supply fault sensing and detecting device, which comprises a signal acquisition module, a detecting main body, and a signal processing module, a fault judging module and a communication module which are integrated on the detecting main body, the signal acquisition module is used for acquiring various signals related to the running state of the medium-voltage power supply, including a voltage signal, a current signal, a temperature signal and a partial discharge signal; the detection main body is mounted on the guide rail through the connecting assembly; the signal processing module is used for receiving the original signal acquired by the signal acquisition module and carrying out preprocessing and feature extraction on the original signal; the fault judgment module judges whether the medium-voltage power supply has a fault or not and judges the fault type according to the characteristic quantity extracted by the signal processing module in combination with a preset fault criterion; and the communication module is used for sending the fault alarm signal and the fault information generated by the fault judgment module to a monitoring center. The device has the beneficial effects of comprehensive and accurate detection, stable installation, convenient operation and maintenance and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to power system detection technical field, concretely relates to a kind of medium voltage power supply fault perception and detection device. BACKGROUND

[0002] In power system, medium voltage power supply undertakes the important task of converting high voltage electric energy into voltage level suitable for user, and its stable operation is crucial to guarantee the reliability and safety of power supply. However, medium voltage power supply is affected by various factors such as equipment aging, harsh environment, operation error in actual operation process, and thus various faults are prone to occur.

[0003] At present, the existing medium voltage power supply fault detection device in the market has some deficiencies. Some devices can only detect single type of fault signal, and cannot cover all possible fault types of medium voltage power supply, resulting in limited range of fault detection. The detection accuracy of some devices is low, and misjudgment or omission is prone to occur, which cannot provide accurate fault information for power system operation and maintenance personnel. Furthermore, the installation method of some detection devices is not convenient and stable, and may be loose, displaced and other problems during long-term use, affecting the normal operation of the device. UTILITY MODEL CONTENT

[0004] The utility model mainly aims at the problems of limited fault detection range, low precision and unstable installation in prior art, and provides a kind of medium voltage power supply fault perception and detection device, which realizes comprehensive, accurate and rapid detection of medium voltage power supply fault, and facilitates installation and maintenance of the device.

[0005] The purpose of the utility model is mainly realized through the following scheme:

[0006] The medium voltage power supply fault perception and detection device comprises a signal acquisition module, a detection main body, and a signal processing module, a fault judgment module and a communication module integrated on the detection main body. The signal acquisition module is used to acquire various signals related to the operating state of the medium voltage power supply, including voltage signal, current signal, temperature signal and partial discharge signal. The detection main body comprises a shell, and the back of the shell is fixedly connected with a connecting assembly, and the detection main body is installed on the guide rail through the connecting assembly. The signal processing module is used to receive the original signals collected by the signal acquisition module, and to preprocess and extract features. The fault judgment module judges whether the medium voltage power supply has faults and the fault type according to the feature quantity extracted by the signal processing module and the preset fault criterion. The communication module is used to send the fault alarm signal and fault information generated by the fault judgment module to the monitoring center.

[0007] As preferred, the connecting assembly comprises a bottom plate, U-shaped hooks are arranged on the left and right sides of the bottom plate, a lower clamping groove is formed in the lower part of the U-shaped hook, notches are arranged on the upper and lower sides of the bottom plate, limit sliding grooves are formed on the left and right sides of the notches, a sliding plate is slidably connected to the bottom plate through the limit sliding grooves, upper clamping hooks are arranged on the left and right sides of the sliding plate, upper clamping grooves are formed in the upper parts of the upper clamping hooks and matched with the lower clamping grooves, the upper and lower ends of the guide rail are clamped in the upper clamping grooves and the lower clamping grooves respectively, and a stretching assembly is arranged on the bottom plate and connected with the sliding plate, the stretching assembly can drive the upper clamping hooks to clamp the guide rail downward.

[0008] As preferred, the stretching assembly comprises an upper limit plate, a lower limit plate and a stretching spring mounted between the upper limit plate and the lower limit plate, the upper limit plate is fixedly connected to the bottom plate, and the lower limit plate is fixedly connected to the sliding plate.

[0009] As preferred, limit blocks are arranged on the upper and lower ends of the sliding plate, and the length of the limit block is greater than the width of the limit sliding grooves on the two sides of the notch.

[0010] As preferred, a voltage transformer is used for voltage signal acquisition in the signal acquisition module, a current transformer is used for current signal acquisition in the signal acquisition module, a thermocouple or a thermistor is used for temperature signal acquisition in the signal acquisition module, and an ultrasonic sensor or a high-frequency current sensor is used for partial discharge signal acquisition in the signal acquisition module.

[0011] As preferred, a digital signal processor or a field programmable gate array is used as a core processing chip in the signal processing module.

[0012] As preferred, a neural network algorithm, a support vector machine algorithm or an expert system algorithm is used for fault diagnosis in the fault judgment module.

[0013] As preferred, an Ethernet, an RS485 or a wireless communication mode is used in the communication module, and a MODBUS communication protocol is used.

[0014] As preferred, the U-shaped hook and the bottom plate are in an integral molding structure, the sliding plate and the upper clamping hook are in an integral molding structure, and anti-skid rubber pads are arranged on the inner side walls of the lower clamping groove and the upper clamping groove, and anti-skid lines are arranged on the surface of the anti-skid rubber pad.

[0015] As preferred, the surface of the shell is provided with heat dissipation holes, the heat dissipation holes are distributed in a honeycomb shape, the front surface of the shell is provided with a display screen and operation buttons, the display screen is used for displaying the running state and fault information of the medium-voltage power supply, and the operation buttons are used for parameter setting and function operation of the detection device.

[0016] Therefore, compared with the prior art, the utility model has the following advantages:

[0017] (1) The signal acquisition module in the utility model collects multiple signals related to the operation state of the medium voltage power supply, the signal processing module and the fault judgment module adopt advanced processing chips and fault diagnosis algorithms, and can comprehensively and accurately detect various faults of the medium voltage power supply, reducing the situation of misjudgment and missed judgment.

[0018] (2) The connecting assembly is provided, the stretching assembly in the connecting assembly clamps the guide rail downward by the upper clamping hook, and the inner wall of the lower clamping groove and the upper clamping groove is provided with an antiskid rubber pad with an antiskid pattern, so that the detection main body is stably installed on the guide rail and is not easy to loosen and displace, and long-term stable operation of the device is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the installation schematic view of the detection main body in the utility model;

[0020] Figure 2 is the structural schematic view of the connecting assembly in the utility model.

[0021] Illustration: 1 - shell, 2 - guide rail, 3 - bottom plate, 4 - U-shaped clamping hook, 5 - lower clamping groove, 6 - notch, 7 - limiting sliding slot, 8 - sliding plate, 9 - upper clamping hook, 10 - upper clamping groove, 11 - upper limiting plate, 12 - lower limiting plate, 13 - stretching spring, 14 - limiting block. DETAILED DESCRIPTION

[0022] The technical scheme of the utility model will be further specifically explained below by specific embodiments and in combination with the drawings. It should be understood that the implementation of the utility model is not limited to the following embodiments, and any form of variation and / or change of the utility model will fall within the scope of protection of the utility model.

[0023] In the utility model, if not specified, all parts, percentages are weight units, and the equipment and raw materials used can be purchased from the market or commonly used in the art. The methods in the following examples are conventional methods in the art unless otherwise specified. The components or equipment in the following examples are general standard components or components known to those skilled in the art unless otherwise specified, and their structure and principle can be known to the skilled person through technical manual or obtained through conventional experimental methods.

[0024] Example 1:

[0025] As shown in Figure 1 , 2 The utility model provides a technical scheme, medium voltage power supply fault sensing and detection device, including signal acquisition module, detection main body, and signal processing module, fault judgment module and communication module integrated on the detection main body;

[0026] The signal acquisition module is used for acquiring various signals related to the running state of the medium-voltage power supply, including voltage signals, current signals, temperature signals, and partial discharge signals. Specifically, the voltage signals are acquired through a voltage transformer; the current signals are obtained with the aid of a current transformer; the temperature signals are measured using a thermocouple or a thermistor; and the partial discharge signals are acquired using an ultrasonic sensor or a high-frequency current sensor. By acquiring multiple signals, the running state of the medium-voltage power supply can be comprehensively reflected.

[0027] The detection main body includes a shell 1, the back of the shell 1 is fixedly connected with a connecting assembly through bolts, and the detection main body is installed on the guide rail 2 through the connecting assembly, and the guide rail is fixedly connected to the wall body or the cabinet body through bolts.

[0028] The signal processing module uses a digital signal processor or a field programmable gate array as a core processing chip, which is used to receive the original signals collected by the signal acquisition module, pre-process and extract features from the signals. The pre-processing process includes filtering, amplification, analog-to-digital conversion, etc., to remove noise and interference in the signal and improve signal quality. Feature extraction is to extract characteristic quantities that can reflect the running state of the medium-voltage power supply from the pre-processed signals, such as voltage amplitude, current effective value, temperature change rate, and partial discharge pulse frequency.

[0029] The fault judgment module judges whether the medium-voltage power supply has failed and the type of failure according to the characteristic quantities extracted by the signal processing module and the pre-set fault criteria. This module uses neural network algorithm, support vector machine algorithm or expert system algorithm for fault diagnosis, which improves the accuracy and reliability of fault judgment. When the medium-voltage power supply is judged to have failed, a fault alarm signal will be generated immediately.

[0030] The communication module uses Ethernet, RS485 or wireless communication, and adopts MODBUS communication protocol, which is used to send the fault alarm signal and fault information generated by the fault judgment module to the monitoring center, so that the operation and maintenance personnel can timely understand the fault condition of the medium-voltage power supply and take corresponding measures.

[0031] Example 2:

[0032] As Figure 1 , 2As shown, the utility model provides another technical scheme, the middle pressure power failure perception and detection device, with the difference that the above connection subassembly includes bottom plate 3, bottom plate 3 is fixedly connected between the shell 1 through bolt, the left and right sides of bottom plate 3 are integrally provided with U type hook 4, the lower part of U type hook 4 is provided with lower clamping slot 5, the upper and lower sides of bottom plate 3 are provided with notch 6, and the left and right sides of notch 6 are provided with limit sliding slot 7, and the upper and lower sides of bottom plate 3 are integrally provided with upper clamping hook 9, the upper part of upper clamping hook 9 is provided with upper clamping slot 10 for cooperation with lower clamping slot 5, the upper and lower ends of guide rail 2 are clamped in upper clamping slot 10 and lower clamping slot 5 respectively, and bottom plate 3 is provided with stretching assembly connected with sliding plate 8, and the stretching assembly is composed of upper limit plate 11, lower limit plate 12 and stretching spring 13 installed between upper limit plate 11 and lower limit plate 12, upper limit plate 11 is fixedly connected on bottom plate 3, lower limit plate 12 is fixedly connected on sliding plate 8, and the stretching assembly can drive upper clamping hook 9 to clamp guide rail 2 downwards.

[0033] Specifically, the upper and lower ends of the sliding plate 8 are provided with limit blocks 14, the length of the limit block 14 is greater than the width of the limit sliding slot 7 on both sides of the notch 6, which can prevent the sliding plate 8 from being separated from the bottom plate 3.

[0034] Specifically, the inner side walls of the lower clamping slot 5 and the upper clamping slot 10 are bonded with anti-skid rubber pads, the surface of the anti-skid rubber pads is provided with anti-skid lines, which is used to increase the friction with the guide rail 2 and prevent the detection main body from sliding on the guide rail 2.

[0035] During installation, first, the guide rail 2 is installed in the appropriate position, then the sliding plate 8 is pulled upwards, so that the stretching spring 13 is in a stretched state, at this time, the distance between the upper clamping slot 10 and the lower clamping slot 5 is increased, the lower end of the guide rail 2 is clamped into the lower clamping slot 5, then the sliding plate 8 is released, under the action of the stretching spring 13, the upper clamping hook 9 moves downwards, the upper end of the guide rail 2 is clamped into the upper clamping slot 10, thereby realizing the installation of the detection main body on the guide rail 2, and because the inner side walls of the lower clamping slot 5 and the upper clamping slot 10 are provided with anti-skid rubber pads with anti-skid lines, the stability of the installation can be further enhanced.

[0036] Specifically, the surface of the shell 1 is provided with heat dissipation holes, the heat dissipation holes are distributed in a honeycomb shape, which is used to improve the heat dissipation performance of the detection main body, and the front surface of the shell 1 is provided with a display screen and operation buttons, the display screen is used to display the running state and fault information of the middle voltage power supply, and the operation buttons are used for parameter setting and function operation of the detection device.

[0037] The middle voltage power supply fault perception and detection device provided by the utility model has the advantages that:

[0038] 1. Implementation of signal acquisition module

[0039] Voltage signal acquisition: Choose the appropriate voltage transformer, connect its primary side to the incoming and outgoing sides of the medium voltage power supply, and the voltage signal output from the secondary side is processed by the isolation and filtering circuit and then input to the signal processing module. This can ensure that the collected voltage signal is accurate, stable, and not affected by external interference.

[0040] Current signal acquisition: Use a high-precision current transformer, connect its primary side in series to the main circuit of the medium voltage power supply, and the current signal output from the secondary side is converted to a voltage signal by the signal conditioning circuit, and then filtered and amplified before being transmitted to the signal processing module. In this way, the current value of the medium voltage power supply can be accurately measured.

[0041] Temperature signal acquisition: Install thermocouples or thermistors at parts of the transformer winding and switching equipment that are prone to heating, convert the temperature signal to an electrical signal, and then amplify and digitize it before sending it to the signal processing module. To improve the accuracy of temperature detection, multiple temperature sensors can be used for multi-point measurement, and a more accurate temperature value can be obtained through data fusion algorithms.

[0042] Partial discharge signal acquisition: Use ultrasonic sensors or high-frequency current sensors installed on the housings of transformers, switch cabinets, and other equipment to detect the partial discharge signals inside the medium voltage power supply equipment. The collected partial discharge signals are amplified, filtered, and anti-interference processed before being input to the signal processing module.

[0043] 2. Implementation of the signal processing module

[0044] Choose appropriate digital signal processors or field programmable gate arrays as the core processing chips to build the hardware platform of the signal processing module. Write signal processing software to implement the preprocessing and feature extraction of the collected raw signals. In the preprocessing stage, use digital filters to filter the signals to remove noise and interference. Common digital filters include low-pass filters, high-pass filters, and band-pass filters. Choose the appropriate filter type and parameters based on the characteristics of the signal, then amplify and digitize the filtered signals to convert the analog signals to digital signals. In the feature extraction stage, use appropriate feature extraction algorithms based on the type of signal. For example, for voltage and current signals, calculate their amplitude, effective value, phase angle, etc. For temperature signals, calculate the temperature change rate. For partial discharge signals, extract the frequency, amplitude, and phase of the discharge pulse.

[0045] 3. Implementation of the fault judgment module

[0046] Establishing preset fault criterion: Through a large number of experimental research and actual operation data statistical analysis, the fault criterion of various fault types of the medium voltage power supply is established. For example, for overvoltage fault, the voltage amplitude exceeding a certain proportion (such as 110%) of the rated voltage is set as the fault threshold; for overcurrent fault, according to the rated current and protection requirement of the medium voltage power supply, the fault criterion of overcurrent multiple is determined; for transformer winding fault, the comprehensive fault criterion can be established by analyzing the changes of the resistance, inductance, capacitance and other parameters of the winding, combined with the temperature and partial discharge of the winding;

[0047] Selecting appropriate fault diagnosis algorithm: According to actual needs, neural network algorithm, support vector machine algorithm or expert system algorithm can be selected. Taking the neural network algorithm as an example, firstly, a large number of sample data of the medium voltage power supply under normal operation and various fault states are collected, the sample data is preprocessed and feature extracted, the input vector and target vector for training the neural network are obtained, then the appropriate neural network structure is selected, such as multi-layer feedforward neural network (MLP), and the parameters of the network are set, such as the number of layers, the number of nodes, the learning rate, etc., then the neural network is trained by using the training samples, the weights and thresholds of the network are adjusted, so that the output error of the network reaches the minimum, after the training is completed, the feature quantity extracted by the signal processing module is input into the trained neural network, and the neural network judges whether the medium voltage power supply has fault and the fault type according to the learned knowledge.

[0048] 4. Implementation of communication module

[0049] According to actual application requirements, appropriate communication mode and communication equipment are selected, if wired communication with the monitoring center is needed, Ethernet interface chip or RS485 communication interface chip can be used, if wireless communication is needed, Wi-Fi module, Bluetooth module or ZigBee module can be selected; according to MODBUS communication protocol, the communication program is written, in the communication process, the fault judgment module packs the fault alarm signal and fault information into data frame according to the communication protocol, and sends it to the monitoring center through the communication module, the monitoring center receives the data frame, analyzes it according to the same communication protocol, obtains the fault information and processes it accordingly.

[0050] It should be noted that the isolation and filtering circuit, signal conditioning circuit and the like mentioned above all use existing general technologies widely used in the industry, and no special improvement is made in the present application, they are only used as conventional means to realize the signal acquisition function and signal processing function, and their specific structure and circuit connection will not be described here.

[0051] The medium-voltage power supply fault sensing and detecting device provided by the application can effectively realize comprehensive, accurate and rapid detection of medium-voltage power supply faults, and provides strong guarantee for stable operation of a power system.In actual application, the hardware and software of the device can be properly adjusted and optimized according to different medium-voltage power supply systems and user requirements, so as to meet diversified application scenarios

[0052] It should be understood that the embodiments are only used for illustrating the present application but not for limiting the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope defined by the claims of the present application.

Claims

1. Medium voltage power supply fault awareness and detection apparatus, characterized by: The device comprises a signal acquisition module, a detection main body, and a signal processing module, a fault judgment module and a communication module integrated on the detection main body; The signal acquisition module is used for acquiring various signals related to the running state of the medium-voltage power supply, including voltage signals, current signals, temperature signals and partial discharge signals; The detection main body comprises a shell (1), the back surface of the shell (1) is fixedly connected with a connecting assembly, and the detection main body is installed on a guide rail (2) through the connecting assembly; The signal processing module is used for receiving the original signals collected by the signal acquisition module, pre-processing and feature extraction of the original signals. The fault judgment module judges whether the medium-voltage power supply has a fault and the fault type according to the feature quantity extracted by the signal processing module and in combination with a preset fault criterion. The communication module is used for sending the fault alarm signal and fault information generated by the fault judgment module to a monitoring center.

2. The medium voltage power source fault sensing and detection apparatus of claim 1, wherein: The connecting assembly comprises a bottom plate (3), U-shaped hooks (4) are arranged on the left and right sides of the bottom plate (3), a lower clamping groove (5) is arranged on the lower part of the U-shaped hook (4), notches (6) are arranged on the upper and lower sides of the bottom plate (3), limit sliding grooves (7) are arranged on the left and right sides of the notches (6), a sliding plate (8) is slidably connected to the bottom plate (3) through the limit sliding grooves (7), upper hooks (9) are arranged on the left and right sides of the sliding plate (8), an upper clamping groove (10) is arranged on the upper part of the upper hook (9) and is used in cooperation with the lower clamping groove (5), the upper and lower ends of the guide rail (2) are clamped in the upper clamping groove (10) and the lower clamping groove (5) respectively, and a stretching assembly connected with the sliding plate (8) is arranged on the bottom plate (3), the stretching assembly can drive the upper hook (9) to clamp the guide rail (2) downward.

3. The medium voltage power source fault sensing and detection apparatus of claim 2, wherein: The stretching assembly comprises upper limit plates (11), lower limit plates (12) and a stretching spring (13) mounted between the upper limit plates (11) and the lower limit plates (12), the upper limit plates (11) are fixedly connected to the bottom plate (3), and the lower limit plates (12) are fixedly connected to the sliding plate (8).

4. The medium voltage power source fault sensing and detection apparatus of claim 3, wherein: Limiting blocks (14) are arranged on the upper and lower ends of the sliding plate (8), and the length of the limiting block (14) is greater than the width of the limit sliding grooves (7) on the left and right sides of the notches (6).

5. The medium voltage power source fault sensing and detection apparatus of claim 1, wherein: The voltage signal acquisition in the signal acquisition module adopts a voltage transformer, the current signal acquisition in the signal acquisition module adopts a current transformer, the temperature signal acquisition in the signal acquisition module adopts a thermocouple or a thermistor, and the partial discharge signal acquisition in the signal acquisition module adopts an ultrasonic sensor or a high-frequency current sensor.

6. The medium voltage power source fault sensing and detection apparatus of claim 1, wherein: The signal processing module adopts a digital signal processor or a field programmable gate array as a core processing chip.

7. The medium voltage power source fault sensing and detection apparatus according to claim 1, characterized in that: The fault judgment module adopts a neural network algorithm, a support vector machine algorithm or an expert system algorithm for fault diagnosis.

8. The medium voltage power source fault sensing and detection apparatus according to claim 1, characterized in that: The communication module adopts an Ethernet, RS485 or wireless communication mode, and adopts a MODBUS communication protocol.

9. The medium voltage power source fault sensing and detection apparatus according to claim 4, characterized in that: The U-shaped clamping hook (4) and the bottom plate (3) are an integral molding structure, the sliding plate (8) and the upper clamping hook (9) are an integral molding structure, and the inner side wall of the lower clamping groove (5) and the upper clamping groove (10) is provided with an antiskid rubber pad, and the surface of the antiskid rubber pad is provided with an antiskid line.

10. The medium voltage power source fault sensing and detection apparatus of claim 9, wherein: The surface of the shell (1) is provided with heat dissipation holes, the heat dissipation holes are distributed in a honeycomb shape, and the front surface of the shell (1) is provided with a display screen and operation buttons, the display screen is used for displaying the running state and fault information of the medium-voltage power supply, and the operation buttons are used for parameter setting and function operation of the detection device.

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