CN209821343U - High-voltage switch cabinet partial discharge positioning and early warning system based on ultrasonic technology - Google Patents

Abstract

Based on ultrasonic technology high-voltage switchgear partial discharge positioning and early warning system, the system is mainly composed of DSP minimum system, ultrasonic sensor, signal amplification unit, signal filter unit, sound and light early warning unit, reset unit, start button, stop button, emergency stop button, parameters It consists of a setting unit, a display drive unit, a liquid crystal display, a data export unit, a communication interface, and a monitoring computer. DSP extracts the early ultrasonic characteristic signals of partial discharge detected by ultrasonic sensors, identifies ultrasonic signals, judges partial discharge faults, and performs fault warnings. The research on partial discharge localization and early warning technology of high-voltage switchgear based on ultrasonic technology can detect switchgear faults in time and improve the security of power distribution network.

Description

Partial discharge localization and early warning system of high voltage switchgear based on ultrasonic technology

technical field

The utility model relates to a high-voltage power distribution switch cabinet monitoring technology, in particular to a high-voltage switch cabinet partial discharge positioning and early warning system based on ultrasonic technology.

Background technique

Insulation faults seriously threaten the normal operation of high-voltage switchgear, and partial discharge is an important means to detect its insulation faults. The insulation test of the existing high-voltage switchgear adopts the method of regular inspection and fault test, and the fault cannot be found before the accident occurs, let alone the location of the impending accident point can not be determined.

Utility model content

Purpose of utility model:

The utility model provides a partial discharge positioning and early warning system of a high-voltage switch cabinet based on ultrasonic technology, and its purpose is to solve the existing problems in the past.

Technical solutions:

In order to solve the above existing problems, the utility model provides a partial discharge positioning and early warning system for high voltage switch cabinets based on ultrasonic technology.

Based on ultrasonic technology, the high-voltage switchgear partial discharge positioning and early warning system is mainly composed of DSP minimum system, ultrasonic sensor, signal amplification unit, signal filter unit, sound and light early warning unit, reset unit, start button, stop button, emergency stop button, parameter setting unit , display drive unit, liquid crystal display, data export unit, communication interface, monitoring computer, wherein the measurement end of the ultrasonic sensor is connected to the grounding device of the high-voltage switchgear, and the signal output end of the ultrasonic sensor is connected to the signal input end of the signal amplification unit Connection, the signal output end of the signal of the signal amplification unit is connected with the signal input end of the signal filter unit, the signal output end of the signal filter unit is connected with the signal input end of the DSP minimum system, the signal input end of the sound and light warning unit is connected with the DSP The signal output terminals of the minimum system are connected, the signal output terminal of the reset unit is connected with the signal input terminal of the DSP minimum system, the signal output terminals of the start button, stop button, and emergency stop button are connected with the signal input terminals of the DSP minimum system, The signal output terminal of the parameter setting unit is connected to the parameter signal input terminal of the DSP minimum system, the signal input terminal of the display drive unit is connected to the signal output terminal of the DSP minimum system, and the signal input terminal of the LCD screen is connected to the signal of the display drive unit The output terminals are connected, the signal input terminal of the data export unit is connected with the signal output terminal of the DSP minimum system, the signal input terminal of the communication interface is connected with the communication signal output terminal of the DSP minimum system, and the signal input terminal of the monitoring computer is connected with the communication interface connected to the signal output terminal.

The display screen (also can be a hand-held display screen) is temporarily fixed by a temporary fixing device (temporarily fixed on the wall or the outer surface of the power distribution switch cabinet, so that it can be observed at any time, and the position can also be adjusted at will to adapt to different scenarios. );

Temporary fixing devices include horizontal plates, external threaded poles and "T" shaped pressure plates;

There are two externally threaded vertical rods, and the two externally threaded vertical rods pass through the two ends of the horizontal plate (the two externally threaded vertical rods pass through the through holes at both ends of the horizontal plate, and the diameter of the through hole is slightly larger than that of the externally threaded vertical rod diameter), so that the horizontal plate can move up and down along the axial direction of the externally threaded vertical rod;

The "T" shaped pressure plate includes a pressure plate vertical rod and a pressure plate horizontal plate, and the pressure plate vertical rod is vertically arranged on the upper end of the pressure plate horizontal plate to form a "T" shape structure with the pressure plate horizontal plate;

The lower end of the horizontal plate is provided with a standpipe and two vertical ejector rods. The two vertical ejector rods are located on both sides of the vertical pipe. To the telescopic action (the pressure plate vertical rod will not completely break away from the standpipe, this method belongs to the prior art, for example, a cap with a diameter larger than the pressure plate vertical rod (, the diameter of the cap is compatible with the inner diameter of the vertical pipe) can be made on the upper end of the pressure plate vertical rod , and then make a fixed cap at the opening at the bottom of the riser, and open a through hole in the center of the cap that is suitable for the diameter of the pressure plate pole, for the pressure plate pole to pass through, so that the pressure plate pole will not fall off completely); the pressure plate There is a spring on the pole, the upper end of the spring touches the standpipe, and the lower end of the spring touches the horizontal plate of the pressure plate; the bottom of the horizontal plate of the pressure plate is provided with a universal ball head (also called universal wheel, universal ball, universal ball bearing belong to the existing components), the two ends of the horizontal plate of the pressure plate are respectively provided with a through hole, and the lower pressure rod passes through the two through holes of the horizontal plate of the pressure plate, and can move up and down in the through hole; (the lower pressure rod Directly adapt to the diameter of the through hole, as long as it is just enough for the lower pressure rod to move)

The two vertical ejector rods respectively correspond to the upper ends of the two lower pressing rods and keep a gap with the upper ends of the two lower pressing rods;

The upper part of the externally threaded vertical rod is provided with an adjusting nut, and the adjusting nut is arranged on the upper part of the horizontal plate; the lower end of the externally threaded vertical rod is provided with a suction cup; (the existing suction cup can be used)

When in use, attach the suction cup to the ground, then place the display screen frame at the bottom of the universal ball head, twist the adjustment nut, so that the horizontal plate moves down and compresses the spring, giving a preliminary pre-tightening pressure to the screen frame. At this time, Due to the function of the universal ball head, the position of the display frame can still be fine-tuned, such as the angle, etc. At this time, the two vertical ejector rods and the two down-press rods are not in contact, and a distance is kept; adjust the position of the display frame according to needs. Fine-tune, and then continue to twist the adjustment nut, so that the two vertical rods continue to move down and move down against the two lower rods until the lower ends of the two lower rods press against the display frame to complete the positioning. (At this time, due to the continuous downward movement of the horizontal plate, the pressure of the universal ball head on the upper surface of the display screen frame continues to increase, forming the first stage of compression, and the second stage of compression due to the action of the two vertical jacks , to complete the positioning of the lightning impulse withstand voltage generator, to prevent its movement or dumping from affecting the implementation process or damage to the equipment; The two vertical jacks gradually leave the two down-pressing rods and contact the pressing force until the spring fully returns to the initial state, and the two-stage pressing force is released. In addition, as the two vertical jacks move upward, the pull rope will also pull The two push-down levers move up and away from the display bezel.

A stay rope is connected between the vertical ejector rod and the lower pressure rod.

The side walls at the upper and lower ends of the lower pressing rod are respectively provided with a block for preventing the lower pressing rod from falling off from the horizontal plate of the pressing plate.

Description of the working process of the high-voltage switchgear partial discharge positioning and early warning system based on ultrasonic technology: After the system is powered on, set the system operating parameters, press the start button, and the DSP minimum system collects ultrasonic sensor data processed by the signal amplification unit and signal filtering unit, and identifies Ultrasonic signal, judge the insulation state of high-voltage switchgear, display and export the insulation information of high-voltage switchgear, give sound and light warning when a failure is about to occur, and send the insulation state of high-voltage switchgear to the monitoring computer through the communication interface.

Advantages and effects:

In the utility model, the DSP extracts the partial discharge early ultrasonic characteristic signal detected by the ultrasonic sensor, recognizes the ultrasonic signal, judges the partial discharge fault, and performs fault early warning, and carries out the research on the partial discharge positioning and early warning technology of the high-voltage switchgear based on the ultrasonic technology, which can timely Detect switchgear faults and improve the security of power distribution networks.

In addition, in order to facilitate the observation of data, a separate display screen is used, and the display screen can be temporarily fixed at any position at will, which is convenient for users to perform corresponding adaptive operations according to different scenarios, and the position can be changed at will, which is very convenient to use. Greatly improve work efficiency.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 Structural diagram of partial discharge localization and early warning system of high-voltage switchgear based on ultrasonic technology;

Figure 2 Flow chart of partial discharge location and early warning system for high-voltage switchgear based on ultrasonic technology;

Figure 3 is a schematic diagram of the temporary fixing device.

Detailed ways

Partial discharge positioning and early warning system of high voltage switchgear based on ultrasonic technology, characterized in that the system mainly includes DSP minimum system, ultrasonic sensor, signal amplification unit, signal filter unit, sound and light early warning unit, reset unit, start button, stop button, emergency Stop button, parameter setting unit, display drive unit, liquid crystal display, data export unit, communication interface and monitoring computer;

The measuring end of the ultrasonic sensor is connected to the grounding device of the high-voltage switchgear, the signal output end of the ultrasonic sensor is connected to the signal input end of the signal amplifying unit, and the signal output end of the signal amplifying unit is connected to the signal input end of the signal filtering unit The signal output end of the signal filtering unit is connected with the signal input end of the DSP minimum system, the signal input end of the sound and light warning unit is connected with the signal output end of the DSP minimum system, and the signal output end of the reset unit is connected with the DSP minimum system The signal input terminals of the start button, stop button, and emergency stop button are connected to the signal input terminals of the DSP minimum system, and the signal output terminals of the parameter setting unit are connected to the parameter signal input terminals of the DSP minimum system. The signal input terminal of the display drive unit is connected to the signal output terminal of the DSP minimum system, the signal input terminal of the LCD screen is connected to the signal output terminal of the display drive unit, and the signal input terminal of the data export unit is connected to the signal output terminal of the DSP minimum system The signal input end of the communication interface is connected with the communication signal output end of the DSP minimum system, and the signal input end of the monitoring computer is connected with the signal output end of the communication interface.

The system also includes an instruction input unit connected with the DSP minimum system.

The display screen (can also be a hand-held display screen) is temporarily fixed by a temporary fixing device (temporarily fixed on the wall or the outer surface of the power distribution switch cabinet, so that it can be observed at any time, and the position can be adjusted at will to adapt to different scenarios);

The temporary fixing device includes a horizontal plate 111, an externally threaded vertical rod 222 and a "T" shaped pressing plate;

There are two externally threaded vertical rods 222, and two externally threaded vertical rods 222 pass through the two ends of the horizontal plate 111 (the two externally threaded vertical rods 222 pass through the through holes at the two ends of the horizontal plate 111, and the diameter of the through hole is approximately greater than the diameter of the externally threaded vertical rod 222), so that the horizontal plate 111 can move up and down along the axial direction of the externally threaded vertical rod 222;

The "T" shaped pressing plate includes a pressing plate vertical rod 333-1 and a pressing plate horizontal plate 333-2, and the pressing plate vertical rod 333-1 is vertically arranged on the upper end of the pressing plate horizontal plate 333-2 to form a "T" shaped structure with the pressing plate horizontal plate 333-2;

The lower end of the horizontal plate 111 is provided with a standpipe 111-1 and two vertical ejector rods 111-2, and the two vertical ejector rods 111-2 are located on both sides of the vertical pipe 111-1. The lower end opening of -1 stretches into the standpipe 111-1 and the pressure plate vertical rod 333-1 can do axial telescopic movement relative to the standpipe 111-1 (the pressure plate vertical rod 333-1 will not be completely out of the vertical pipe 111-1) Disengage, this method belongs to prior art, for example can make a diameter bigger than the cap of pressure plate vertical rod (333-1 at the upper end of pressure plate vertical rod 333-1, the diameter of cap is adapted to the internal diameter of standpipe 111-1, then in standpipe Make a fixed cap at the opening at the bottom of 111-1, and open a through hole in the center of the cap that is compatible with the diameter of the pressure plate vertical rod 333-1, for the pressure plate vertical rod 333-1 to pass through, so that the pressure plate vertical rod will not fall off completely 333-1 is covered with a spring 333-3, the upper end of the spring 333-3 touches the standpipe 111-1, and the lower end of the spring 333-3 touches the pressure plate horizontal plate 333-2; the pressure plate horizontal plate 333 The bottom of -2 is provided with universal ball head 333-6 (also known as universal wheel, universal ball, universal ball bearing, etc., which belong to existing components), and the two ends of the pressure plate horizontal plate 333-2 are respectively provided with a through hole , the lower pressing rod 333-4 passes through the two through holes of the pressing plate horizontal plate 333-2, and can move up and down in the through hole; (the lower pressing rod 333-4 directly adapts to the diameter of the through hole, as long as it is just Satisfy that the lower pressure rod 333-4 can move)

The two vertical jack rods 111-2 respectively correspond to the upper ends of the two lower pressing rods 333-4 and maintain a gap with the upper ends of the two lower pressing rods 333-4;

The top of the externally threaded vertical rod 222 is provided with an adjusting nut 222-1, and the adjusting nut 222-1 is arranged on the top of the horizontal plate 111; the low end of the externally threaded vertical rod 222 is provided with a suction cup 222-2; )

A stay rope 111-3 is connected between the vertical jack rod 111-2 and the lower pressing rod 333-4.

The sidewalls at the upper and lower ends of the lower pressing rod 333-4 are respectively provided with a block 333-5 for preventing the lower pressing rod 333-4 from falling off from the pressing plate horizontal plate 333-2.

When in use, attach the suction cup 222-2 to the ground, then place the display screen frame 1-1 on the bottom of the universal ball head 333-6, twist the adjusting nut 222-1, so that the horizontal plate 111 moves down and compresses the spring 333- 3. Give the display frame 1-1 a preliminary pre-tightening pressure. At this time, due to the function of the universal ball head 333-6, the position of the display frame 1-1 can still be fine-tuned, such as the angle or the pressure on the frame. position, etc.; at this time, the two vertical ejector rods 111-2 are not in contact with the two push-down rods 333-4, and the distance is kept; fine-tune the position of the display screen frame 1-1 as required, and then continue to twist the adjustment nut 222- 1. Make the two vertical ejector rods 111-2 continue to move down and move down against the two lower pressing rods 333-4 until the lower ends of the two lower pressing rods 333-4 press against the display frame 1-1 to complete the positioning. (At this time, due to the continued downward movement of the horizontal plate 111, the pressure of the universal ball head 333-6 on the upper surface of the display screen frame 1-1 continues to increase, forming the first stage of compression, and due to the two vertical jacks 111 The function of -2 forms the second level of compression, completes the positioning of the lightning impulse withstand voltage generator, and prevents its movement or dumping from affecting the implementation process or damage to the equipment; when it needs to be disassembled, reversely screw the adjustment nut 222-1 , with the reset of the spring 333-3 moving up against the horizontal plate 111, the two vertical ejector rods 111-2 gradually leave the two lower pressing rods 333-4, contacting the pressing force until the spring 333-3 completely returns to the initial state , the two-level pressing force is released. In addition, as the two vertical ejector rods 111-2 move upward, the stay rope 111-3 will also pull the two lower pressing rods 333-4 to move upward and leave the display frame 1-1. .

The positioning and early warning method implemented by the above-mentioned high-voltage switchgear partial discharge positioning and early warning system based on ultrasonic technology is characterized in that: after the system is powered on, the system operating parameters are set, the start button is pressed, and the DSP minimum system acquisition passes through the signal amplification unit. And the ultrasonic sensor data processed by the signal filtering unit, (the error layer-by-layer return algorithm can be used) to identify the ultrasonic signal, judge the insulation status of the high-voltage switchgear, display and export the insulation information of the high-voltage switchgear, and give an audible and visual warning when a failure is about to occur. At the same time, the insulation status of the high-voltage switchgear is sent to the monitoring computer through the communication interface.

When the DSP minimum system recognizes the partial discharge signal, it adopts the error layer-by-layer back algorithm to realize the effective identification of the partial discharge signal; the error layer-by-layer back algorithm has two input variables, and the two variables are power spectra in different frequency ranges. The normalized value of the area also has two output variables. If the output signal is [0,1], it means that the high-voltage switchgear has no partial discharge, and the output signal is [1,0], which means that the high-voltage switchgear has partial discharge.

Claims (5)

1. Based on ultrasonic technology high tension switchgear partial discharge location and early warning system, its characterized in that: the system mainly comprises a DSP minimum system, an ultrasonic sensor, a signal amplification unit, a signal filtering unit, an acousto-optic early warning unit, a reset unit, a start button, a stop button, an emergency stop button, a parameter setting unit, a display driving unit, a liquid crystal display screen, a data export unit, a communication interface and a monitoring computer;

wherein the measuring end of the ultrasonic sensor is connected with the grounding device of the high-voltage switch cabinet, the signal output end of the ultrasonic sensor is connected with the signal input end of the signal amplifying unit, the signal output end of the signal amplifying unit is connected with the signal input end of the signal filtering unit, the signal output end of the signal filtering unit is connected with the signal input end of the DSP minimum system, the signal input end of the acousto-optic early warning unit is connected with the signal output end of the DSP minimum system, the signal output end of the reset unit is connected with the signal input end of the DSP minimum system, the signal output ends of the start button, the stop button and the emergency stop button are connected with the signal input end of the DSP minimum system, the signal output end of the parameter setting unit is connected with the parameter signal input end of the DSP minimum system, the signal input end of the display, the signal input end of the liquid crystal display screen is connected with the signal output end of the display driving unit, the signal input end of the data exporting unit is connected with the signal output end of the DSP minimum system, the signal input end of the communication interface is connected with the communication signal output end of the DSP minimum system, and the signal input end of the monitoring computer is connected with the signal output end of the communication interface.

2. The ultrasonic technology-based high-voltage switch cabinet partial discharge positioning and early warning system as claimed in claim 1, wherein: the system also includes an instruction input unit coupled to the DSP minimal system.

3. The ultrasonic technology-based high-voltage switch cabinet partial discharge positioning and early warning system as claimed in claim 1, wherein:

the liquid crystal display screen is temporarily fixed through a temporary fixing device;

the temporary fixing device comprises a transverse plate (111), an external thread upright stanchion (222) and a T-shaped pressing plate;

the number of the external thread vertical rods (222) is two, and the two external thread vertical rods (222) penetrate through two ends of the transverse plate (111) so that the transverse plate (111) can move up and down along the axial direction of the external thread vertical rods (222);

the T-shaped pressing plate comprises a pressing plate vertical rod (333-1) and a pressing plate transverse plate (333-2), wherein the pressing plate vertical rod (333-1) is vertically arranged at the upper end of the pressing plate transverse plate (333-2) to form a T-shaped structure with the pressing plate transverse plate (333-2);

the lower end of the transverse plate (111) is provided with a vertical pipe (111-1) and two vertical ejector rods (111-2), the two vertical ejector rods (111-2) are positioned at two sides of the vertical pipe (111-1), the upper end of the pressing plate vertical rod (333-1) extends into the vertical pipe (111-1) from the lower end opening of the vertical pipe (111-1), and the pressing plate vertical rod (333-1) can axially extend and retract relative to the vertical pipe (111-1); a spring (333-3) is sleeved on the pressure plate vertical rod (333-1), the upper end of the spring (333-3) is in top contact with the vertical pipe (111-1), and the lower end of the spring (333-3) is in top contact with the pressure plate transverse plate (333-2); the bottom of the pressing plate transverse plate (333-2) is provided with a universal ball head (333-6), two ends of the pressing plate transverse plate (333-2) are respectively provided with a through hole, and the lower pressing rod (333-4) penetrates through the two through holes of the pressing plate transverse plate (333-2) and can move up and down in the through holes;

the two vertical ejector rods (111-2) respectively correspond to the upper ends of the two lower pressure rods (333-4) and keep a gap with the upper ends of the two lower pressure rods (333-4);

the upper part of the external thread upright stanchion (222) is provided with an adjusting nut (222-1), and the adjusting nut (222-1) is arranged on the upper part of the transverse plate (111); the lower end of the external thread upright stanchion (222) is provided with a sucker (222-2).

4. The ultrasonic technology-based high-voltage switch cabinet partial discharge positioning and early warning system as claimed in claim 3, wherein:

a pull rope (111-3) is connected between the vertical ejector rod (111-2) and the lower pressure rod (333-4).

5. The ultrasonic technology-based high-voltage switch cabinet partial discharge positioning and early warning system as claimed in claim 3 or 4, wherein:

the side walls of the upper end and the lower end of the lower pressure rod (333-4) are respectively provided with a clamping block (333-5) for preventing the lower pressure rod (333-4) from falling off from the pressure plate transverse plate (333-2).