Partial discharge on-line monitoring system

Abstract

The utility model discloses a partial discharge on-line monitoring system, comprising a wireless partial discharge monitoring module which is arranged in cabinet type power equipment and is used for monitoring partial discharge in real time, and a signal transmission end of the wireless partial discharge monitoring module is connected with a signal input end of a wireless concentrator. The signal transmission end of the wireless concentrator is connected with the signal input end of the server, and the signal transmission end of the server is connected with an alarm and a mobile device. The server is connected with an alarm, alarms in real time, and realizes remote monitoring through mobile equipment; the device supports on-line monitoring and multi-point monitoring, does not need power failure, can quickly position a discharge point, and ensures safe and stable operation of power equipment.

Description

Technical Field

[0001] The utility model relates to a partial discharge on-line monitoring system, belonging to the technical field of power system monitoring. Background Technique

[0002] With the continuous development of the power system, the requirements for the safety monitoring of power equipment are getting higher and higher, especially for cabinet-type power equipment. As an important part of the power system, the operation stability and safety of cabinet-type power equipment are crucial for the reliable power supply of the entire power grid. However, due to factors such as the environment and equipment aging, partial discharge phenomena will occur during the operation of cabinet-type power equipment, and due to its compact structure and complex operation environment, the partial discharge problem is particularly prominent. This will not only damage the equipment, but may also cause more serious power accidents. Therefore, cabinet-type power equipment needs to be monitored for partial discharge.

[0003] The traditional partial discharge monitoring system for cabinet-type power equipment needs to be carried out under the power-off state, which not only affects the power supply reliability of the power system, but also increases the complexity and cost of monitoring. Especially for old cabinet-type power equipment, its equipment is aging and difficult to maintain, and the partial discharge phenomenon is more frequent. Monitoring under the power-off state not only reduces the monitoring accuracy, but also increases the complexity and cost of monitoring.

[0004] Secondly, the traditional partial discharge monitoring system for cabinet-type power equipment cannot quickly determine the partial discharge point, increasing the operation difficulty. Content of the Utility Model

[0005] In order to solve the above technical problems, the utility model provides a partial discharge on-line monitoring system, which can carry out partial discharge monitoring without power-off, supports on-line monitoring and multi-point monitoring, can quickly locate the discharge point, and ensures the safe and stable operation of power equipment.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A partial discharge on-line monitoring system includes a wireless partial discharge monitoring module arranged inside the cabinet-type power equipment for monitoring partial discharge. The signal transmission end of the wireless partial discharge monitoring module is connected to the signal input end of the wireless aggregator, the signal transmission end of the wireless aggregator is connected to the signal input end of the server, and the signal transmission end of the server is connected with an alarm and a mobile device.

[0008] The wireless partial discharge monitoring module includes a magnetic adsorption housing. Inside the magnetic adsorption housing, there are a partial discharge monitoring sensor for receiving partial discharge pulse signals, a filtering processing module connected to the partial discharge monitoring sensor for removing noise, a partial discharge monitoring acquisition device connected to the filtering processing module for peak calibration of the filtered pulse signals, and a wireless transmission module for transmitting signals to the wireless aggregator. Among them, the partial discharge monitoring sensor, the filtering processing module, the partial discharge monitoring acquisition device, and the wireless transmission module are all powered by batteries.

[0009] The wireless partial discharge monitoring module is detachably installed at five key positions above, below, on both side walls, and at the rear of the cabinet-type power equipment through magnetic adsorption components respectively.

[0010] A further improvement of the technical solution of the present utility model lies in that: the magnetic adsorption component is arranged at the bottom of the magnetic adsorption housing, and includes an annular magnet fixed on the outer side of the magnetic adsorption housing and a spring guide cylinder inside. Inside the spring guide cylinder, there is a spring with a fixed bottom end and a free top end that can be compressed and bounced along the spring guide cylinder. The top end of the spring is fixed with a rubber suction cup that moves up and down with the spring. And the inner diameter of the annular magnet is greater than the outer diameter of the rubber suction cup which is greater than the outer diameter of the spring guide cylinder. When the spring is in a free state, the adsorption end of the rubber suction cup is higher than the annular magnet.

[0011] A further improvement of the technical solution of the present utility model lies in that: four magnetic adsorption components are arranged at the bottom of the magnetic adsorption housing, which are respectively located at four corner positions.

[0012] A further improvement of the technical solution of the present utility model lies in that: the filtering processing module includes a channel 1 circuit, a channel 2 circuit, and a channel 3 circuit:

[0013] The channel 1 circuit is as follows: Two input lines of the power supply are respectively connected to magnetic beads Z1 and Z2 and then connected to a micro-precision voltage converter PT1 to suppress high-frequency noise and spike interference in the circuit. Zener diode T1 and resistor R1 are connected in parallel to play a voltage stabilizing, voltage limiting, and circuit protection role. Then, after passing through resistor R4, capacitor C1, and capacitor C4, a filtered signal is obtained. After the filtered signal passes through operational amplifier U1A, it is connected to the output end through load resistor R13.

[0014] The channel 2 circuit is as follows: Two input lines of the power supply are respectively connected to magnetic beads Z3 and Z4 and then connected to a micro-precision voltage converter PT2 to suppress high-frequency noise and spike interference in the circuit. Zener diode T2 and resistor R2 are connected in parallel to play a voltage stabilizing, voltage limiting, and circuit protection role. Then, after passing through resistor R5, capacitor C2, and capacitor C5, a filtered signal is obtained. After the filtered signal passes through operational amplifier U1B, it is connected to the output end through load resistor R14.

[0015] The circuit of Channel 3 is as follows: Two input lines of the power supply are respectively connected to magnetic beads Z5 and Z6 and then connected to the micro-precision voltage converter PT3 to suppress high-frequency noise and spike interference in the circuit. The zener diode T3 and resistor R3 are connected in parallel to play the roles of voltage regulation, voltage limitation and circuit protection. Then, after passing through the voltage regulating resistor R6 and capacitor C3, a filtered signal is obtained. After the filtered signal passes through the operational amplifier U2B, it is connected to the output terminal through the load resistor R15.

[0016] A further improvement of the technical solution of the present utility model lies in that: the model of the wireless aggregator is YJ_WF_HJQ, and the model of the server is RH5885H V3.

[0017] A further improvement of the technical solution of the present utility model lies in that: the model of the partial discharge monitoring sensor is AE1045S, and the partial discharge monitoring and acquisition device uses an ARM chip for data acquisition and processing.

[0018] A further improvement of the technical solution of the present utility model lies in that: the mobile device includes a mobile phone or a tablet.

[0019] Due to the adoption of the above technical solution, the technical progress obtained by the present utility model is:

[0020] The present utility model is dedicated to cabinet-type power equipment, aiming to realize on-line partial discharge monitoring under live installation. It is convenient to install and can perform on-line partial discharge monitoring and multi-point monitoring without power-off. It can quickly locate the discharge point to ensure the safe and stable operation of power equipment; and after an abnormality is found, it can immediately send out a warning signal to remind the operation and maintenance personnel to deal with it in time to avoid the expansion of the accident.

[0021] The present utility model can be easily installed at any part of the cabinet-type power equipment through the magnetic attraction part without power-off, reducing the installation cost and complexity; and a rubber suction cup that moves up and down with the spring is also arranged inside the magnetic attraction part, which can effectively provide buffering during the adsorption process of the magnetic attraction part, reducing the installation impact force and noise, and prolonging the service life.

[0022] The wireless aggregator adopted by the present utility model can upload the collected data to the server in real time, stably and safely, meeting the application requirements in various scenarios.

[0023] The partial discharge monitoring sensor adopted by the present utility model is a broadband acoustic emission sensor, which can be used to monitor the ultrasonic signal frequency bands of partial discharges of different devices.

[0024] The high-efficient data processing ability of the ARM chip of the present utility model can ensure the real-time and accurate acquisition and analysis of partial discharge signals. Description of the Drawings

[0025] Figure 1It is a schematic diagram of the composition of the present utility model;

[0026] Figure 2 It is a schematic diagram of the composition of the wireless partial discharge monitoring module of the present utility model;

[0027] Figure 3 It is a circuit schematic diagram of the filtering processing module of the present utility model;

[0028] Figure 4 It is a schematic diagram of the installation position of the present utility model;

[0029] Figure 5 It is a schematic diagram of the structure of one direction of the magnetic attraction part of the present utility model;

[0030] Figure 6 It is a schematic diagram of the structure of another direction of the magnetic attraction part of the present utility model;

[0031] Among them, 1. Magnetic attraction housing, 2. Ring magnet, 3. Rubber suction cup, 4. Spring, 5. Spring guide tube. Specific embodiments

[0032] The following further describes the present utility model in detail with reference to the embodiments:

[0033] The present utility model is a partial discharge on-line monitoring system. As Figure 1 shown, it includes a wireless partial discharge monitoring module, which is arranged inside the cabinet-type power equipment and is used for monitoring partial discharge. The signal transmission end of the wireless partial discharge monitoring module is connected to the signal input end of the wireless aggregator, the signal transmission end of the wireless aggregator is connected to the signal input end of the server, and the signal transmission end of the server is connected with an alarm and a mobile device. The mobile device includes a mobile phone or a tablet. Among them, the model of the wireless aggregator is YJ_WF_HJQ, which can upload the collected data to the server in real time, stably and safely, and meet the application requirements in various scenarios; the model of the server is RH5885H V3.

[0034] During the working process, the wireless partial discharge monitoring module will monitor and capture the partial discharge signals in the power equipment in real time, and then send the signals to the wireless aggregator through wireless transmission technology. The wireless aggregator then uploads the collected data to the server in real time. The server can quickly process the uploaded partial discharge data and judge whether to trigger the alarm operation according to the preset alarm threshold to ensure the safe operation of the power system.

[0035] The wireless partial discharge monitoring module is as Figure 2As shown in the figure, it includes a magnetic adsorption housing (1). Inside the magnetic adsorption housing, there are a partial discharge monitoring sensor for receiving partial discharge pulse signals, a filtering processing module connected to the partial discharge monitoring sensor for removing noise, a partial discharge monitoring acquisition device connected to the filtering processing module for peak calibration of the filtered pulse signals, and a wireless transmission module for transmitting the signals to a wireless aggregator. Among them, the partial discharge monitoring sensor, the filtering processing module, the partial discharge monitoring acquisition device, and the wireless transmission module are all powered by batteries.

[0036] Among them, the model of the partial discharge monitoring sensor is AE1045S, which is a broadband acoustic emission sensor and can be used to monitor the partial discharge ultrasonic signal frequency bands of different devices. The partial discharge monitoring acquisition device uses an ARM chip for data acquisition and processing. The high-efficiency data processing ability of the ARM chip can ensure real-time and accurate acquisition and analysis of partial discharge signals.

[0037] As Figure 3 shown in the figure, the filtering processing module includes a channel 1 circuit, a channel 2 circuit, and a channel 3 circuit:

[0038] The channel 1 circuit is as follows: Two input lines of the power supply are respectively connected to magnetic beads Z1 and Z2 and then connected to a micro-precision voltage converter PT1 to suppress high-frequency noise and spike interference in the circuit. The voltage stabilizing diode T1 and the resistor R1 are connected in parallel to play a role in voltage stabilization, voltage limitation, and circuit protection. Then, after passing through the resistor R4, the capacitor C1, and the capacitor C4, a filtered signal is obtained. After the filtered signal passes through the operational amplifier U1A, it is connected to the output terminal through the load resistor R13.

[0039] The channel 2 circuit is as follows: Two input lines of the power supply are respectively connected to magnetic beads Z3 and Z4 and then connected to a micro-precision voltage converter PT2 to suppress high-frequency noise and spike interference in the circuit. The voltage stabilizing diode T2 and the resistor R2 are connected in parallel to play a role in voltage stabilization, voltage limitation, and circuit protection. Then, after passing through the resistor R5, the capacitor C2, and the capacitor C5, a filtered signal is obtained. After the filtered signal passes through the operational amplifier U1B, it is connected to the output terminal through the load resistor R14.

[0040] Channel 1 and channel 2 are two filters with different frequency ranges, which can simultaneously capture and analyze multiple key frequency components in the signal, making it more conducive to analyzing complex partial discharge signals containing multiple frequency components; it can effectively remove non-key frequency components in the signal, thereby protecting the integrity of the signal and reducing noise and interference in subsequent processing.

[0041] The circuit of Channel 3 is as follows: Two input lines of the power supply are respectively connected to the beads Z5 and Z6 and then connected to the micro-precision voltage converter PT3 to suppress high-frequency noise and spike interference in the circuit. The zener diode T3 and the resistor R3 are connected in parallel to play the roles of voltage stabilization, voltage limitation and circuit protection. Then, after passing through the voltage regulating resistor R6 and the capacitor C3, a filtered signal is obtained. After passing through the operational amplifier U2B, the filtered signal is connected to the output terminal through the load resistor R15.

[0042] Channel 3 is a filter for high-frequency noise suppression, which removes high-frequency noise and sets different amplification factors from Channels 1 and 2. It effectively removes high-frequency noise in the signal and improves the signal-to-noise ratio of the signal. This is crucial for improving the accuracy and reliability of partial discharge monitoring. It has an independent amplification factor setting and can be adjusted according to the actual amplitude and dynamic range of the signal. This flexibility enables the system to adapt to a wider range of signal conditions and improves the adaptability and robustness of the system.

[0043] Compare the signal quality evaluation results of the three channels to determine the signal quality of the optimal channel.

[0044] The wireless partial discharge monitoring module of this embodiment is detachably installed above, below, on both side walls and at the rear of the cabinet-type power equipment through magnetic components respectively, specifically as Figure 4 shown. According to the five-point monitoring, the fault point of partial discharge can be located very quickly.

[0045] As Figure 5 and 6 shown, the magnetic components are arranged at the bottom of the magnetic shell 1. In this embodiment, four magnetic components are arranged at the bottom of the magnetic shell 1, respectively located at the four corner positions. It includes an annular magnet 2 fixed on the magnetic shell 1 and a spring guide cylinder 5 inside. A spring 4 with a fixed bottom end and a free top end is arranged inside the spring guide cylinder 5 and can be compressed and bounced along the spring guide cylinder 5; a rubber suction cup 3 is fixed at the top end of the spring 4 and can move up and down with the spring 4; the inner diameter of the annular magnet 2 is larger than the outer diameter of the rubber suction cup 3 which is larger than the outer diameter of the spring guide cylinder 5, and when the spring 4 is in a free state, the adsorption end of the rubber suction cup 3 is higher than the annular magnet 2. It can effectively provide buffering during the adsorption process of the magnetic component, reduce the installation impact force and noise, and extend the service life.

[0046] Example of five-point monitoring and positioning:

[0047] Use specific data to illustrate how to locate the fault point of partial discharge through the signal data received at five monitoring points (top, bottom, left, right and rear side).

[0048] Hypothetical conditions:

[0049] There are five monitoring points, which are respectively located at the top, bottom, left, right and rear side of the cabinet-type power equipment.

[0050] The distances between the monitoring points and their positions relative to the device are known.

[0051] The propagation speed v of the discharge signal in air is known, approximately 340 m / s (under standard conditions).

[0052] The time when each monitoring point receives the discharge signal can be accurately measured.

[0053] Data example:

[0054] Monitoring point X coordinate (m) Y coordinate (m) Z coordinate (m) Receiving time (s) Up 0 0 1 t1 Down 0 0 -1 t2 Left -1 0 0 t3 Right 1 0 0 t4 Back 0 -1 0 t5

[0055] Calculate the time difference:

[0056] Calculate the time difference Δt between the upper and lower monitoring points when receiving the signal 上下 = t 2 - t 1 .

[0057] Similarly, the time differences between other monitoring points can be calculated.

[0058] Calculate the distance difference:

[0059] Use the signal propagation speed and the time difference to calculate the distance difference. For example, Δd 上下 = v × Δt 上下 .

[0060] Hyperbola positioning:

[0061] For the upper and lower monitoring points, the discharge point must be located on the hyperbola with these two monitoring points as the foci, and the distance difference to the two points is equal to Δd 上下 . Similarly, other hyperbolas can be constructed, and these hyperbolas will intersect at a point, which is the estimated position of the discharge point.

[0062] Solve the system of equations:

[0063] Assume the position of the discharge point is (X 0 , Y 0 , Z 0 ). Establish an equation for each hyperbola. Since there are five monitoring points, four independent hyperbola equations can be obtained. By solving this system of equations, we can find the values of (X 0 , Y 0 , Z 0 ).

[0064] Application:

[0065] During implementation, first determine the installation locations of the wireless partial discharge monitoring module according to the structure of the cabinet-type power equipment and the requirements for partial discharge monitoring. These locations include five key positions: the top, bottom, left, right, and rear of the cabinet-type power equipment. Then, install the present utility model at the corresponding positions of the cabinet-type power equipment without power interruption. After installation, transmit the real-time monitored partial discharge data to the server for analysis and processing through a wireless aggregator and a power optical fiber or private network transmission channel. The server performs real-time analysis on the uploaded partial discharge data according to the preset alarm threshold, and issues an alarm signal when the alarm condition is reached to ensure the safety of the power system.

[0066] Users can remotely access the server through a mobile device to view the monitoring data, alarm information, equipment status, etc. in real time. Users can also remotely configure and manage the system according to their needs to meet different monitoring requirements.

[0067] The present utility model can realize real-time and accurate monitoring of the partial discharge signals of cabinet-type power equipment, and provide a strong technical guarantee for the safe and stable operation of the power system.

[0068] The present utility model is particularly applicable to the following scenarios:

[0069] Transformation of old equipment: For old cabinet-type power equipment, due to problems such as equipment aging and difficult maintenance, partial discharge phenomena may be more frequent. By installing the present utility model, real-time monitoring and early warning of old equipment can be realized, the service life of the equipment can be extended, and the maintenance cost can be reduced.

[0070] Monitoring in harsh environments: In harsh environments such as high temperature, high humidity, and high altitude, the operating conditions of cabinet-type power equipment are more demanding, and partial discharge phenomena may be more serious. The present utility model can adapt to various harsh environments to ensure accurate partial discharge monitoring of cabinet-type power equipment under complex conditions.

Claims

1. A partial discharge online monitoring system, characterized in that: It includes a wireless partial discharge monitoring module arranged inside the cabinet-type power equipment for monitoring partial discharge, the signal transmission end of the wireless partial discharge monitoring module is connected to the signal input end of the wireless concentrator, the signal transmission end of the wireless concentrator is connected to the signal input end of the server, and the signal transmission end of the server is connected to an alarm and a mobile device; The wireless partial discharge monitoring module comprises a magnetic shell (1), wherein a partial discharge monitoring sensor for receiving partial discharge pulse signals, a filter processing module connected to the partial discharge monitoring sensor and used for removing noise, a partial discharge monitoring collection device connected to the filter processing module and used for peak calibration of the pulse signal after filtering, and a wireless transmission module for transmitting the signal to a wireless concentrator are arranged inside the magnetic shell; wherein the partial discharge monitoring sensor, the filter processing module, the partial discharge monitoring collection device and the wireless transmission module are all powered by a battery; The wireless partial discharge monitoring module is detachably installed at five key positions of the upper part, the lower part, the two side walls and the rear of the cabinet-type power equipment through magnetic suction parts.

2. A partial discharge online monitoring system according to claim 1, characterized in that: The magnetic attraction component is arranged at the bottom of the magnetic attraction shell (1), and comprises an outer annular magnet (2) fixed on the magnetic attraction shell (1) and an inner spring guide tube (5); a spring (4) with a fixed bottom end and a free top end capable of being compressed and rebounded along the spring guide tube (5) is arranged inside the spring guide tube (5); a rubber suction cup (3) is fixed at the top end of the spring (4) and moves up and down with the spring (4); the inner diameter of the annular magnet (2) is larger than the outer diameter of the rubber suction cup (3) and is larger than the outer diameter of the spring guide tube (5); when the spring (4) is in a free state, the suction end of the rubber suction cup (3) is higher than the annular magnet (2).

3. A partial discharge online monitoring system according to claim 2, characterized in that: Four magnetic attraction members are arranged at the bottom of the magnetic attraction housing (1), respectively located at four corner positions.

4. The partial discharge online monitoring system according to claim 1, characterized in that: The filtering processing module includes a channel 1 circuit, a channel 2 circuit and a channel 3 circuit: The circuit of channel 1 is as follows: the two input lines of the power supply are connected to the magnetic beads Z1 and Z2 respectively, and then connected to the micro-precision voltage converter PT1 to suppress the high-frequency noise and spike interference in the circuit, and connected to the voltage stabilizing diode T1 and the resistor R1 to play the role of voltage stabilization, voltage limiting and circuit protection, and then pass through the resistor R4, capacitors C1 and C4 to obtain the filtered signal. After the filtered signal passes through the operational amplifier U1A, it is connected to the output end through the load resistor R13; The circuit of channel 2 is as follows: the two input lines of the power supply are connected to the magnetic beads Z3 and Z4 respectively, and then connected to the micro-precision voltage converter PT2 to suppress the high-frequency noise and spike interference in the circuit, and connected to the voltage stabilizing diode T2 and the resistor R2 to play the role of voltage stabilization, voltage limiting and circuit protection, and then pass through the resistor R5, capacitors C2 and C5 to obtain the filtered signal, and after the filtered signal passes through the operational amplifier U1B, it is connected to the output end through the load resistor R14; The circuit of channel 3 is as follows: the two input lines of the power supply are connected to the magnetic beads Z5 and Z6 respectively, and then connected to the micro precision voltage converter PT3 to suppress the high-frequency noise and spike interference in the circuit, and are connected to the voltage stabilizing diode T3 and the resistor R3 to play the role of voltage stabilization, voltage limiting and circuit protection, and then pass through the voltage regulating resistor R6 and the capacitor C3 to obtain the filtered signal. After the filtered signal passes through the operational amplifier U2B, it is connected to the output end through the load resistor R15.

5. The partial discharge online monitoring system according to claim 1, characterized in that: The model of the wireless concentrator is YJ_WF_HJQ, and the model of the server is RH5885H V3.

6. A partial discharge online monitoring system according to claim 1, characterized in that: The model of the partial discharge monitoring sensor is AE1045S, and the partial discharge monitoring acquisition device adopts an ARM chip for data acquisition and processing.

7. The partial discharge online monitoring system according to claim 1, characterized in that: The mobile device includes a mobile phone or a tablet.

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