Transformer non-electric quantity protection system

Abstract

The application discloses a transformer non-electric quantity protection system, which comprises a collection module, an inlet module and a master control module.The collection module is used for collecting the pressure inside the transformer to obtain pressure information and sending the pressure information to the master control module; the inlet module is used for collecting and processing the pressure relief diaphragm state and the pressure relief baffle state of the transformer and sending the pressure relief diaphragm state information and the pressure relief baffle state information to the master control module; the master control module is used for receiving the pressure relief diaphragm state information and the pressure relief baffle state information sent by the inlet module, performing logical judgment according to the pressure relief baffle state information and the pressure relief diaphragm state information, sending a trip command to the outlet module when the fault condition is met, and cutting off the power supply of the transformer by the outlet module.When the transformer encounters an arc fault with high energy, the application can collect non-electric quantity information caused by the action of the pressure release system, send an action signal after logical judgment, and cut off the power supply of the transformer in time, so that the pressure wave is prevented from causing damage to other positions.

Description

Technical Field

[0001] This invention relates to the field of transformer equipment fault protection, and in particular to a transformer non-electrical quantity protection system. Background Technology

[0002] Currently, pressure relief valves are widely used as pressure protection devices in transformers. When the internal pressure of the transformer increases during operation, reaching the opening pressure of the pressure relief valve, the valve opens its diaphragm to spray oil, releasing the pressure inside the transformer tank. Simultaneously, the pressure relief valve sends an alarm or trip signal. When a transformer experiences a low-energy fault, the pressure relief valve can release the overpressure, allowing the transformer to continue operating or preventing serious damage. For high-energy faults, the pressure relief valve cannot release the overpressure in a timely manner, especially when the pressure relief valve is too far from the fault location; in such cases, the pressure wave can cause damage to other locations. Summary of the Invention

[0003] The purpose of this invention is to provide a transformer non-electrical quantity protection system, which aims to provide a system for collecting and logically judging information on the diaphragm action of the pressure relief system caused by the high-speed dynamic pressure inside the transformer and the related non-electrical quantity information caused thereby. This system is used to solve the problem of cutting off the system power supply when the transformer encounters an arc fault, thereby preventing the accident from escalating.

[0004] This invention provides a transformer non-electrical quantity protection system, comprising:

[0005] The module includes a data acquisition module, an input module, an output module, a main control module, a human-machine interface module, and a power supply module.

[0006] The acquisition module, connected to the main control module, is used to acquire the pressure information of the transformer and send the pressure information to the main control module.

[0007] The input module, connected to the main control module, is used to collect the status of the pressure relief diaphragm and the pressure relief baffle of the transformer to obtain the pressure relief diaphragm status information and the pressure relief baffle status information. After processing the pressure relief diaphragm status information and the pressure relief baffle status information, it is sent to the main control module.

[0008] The main control module is used to receive pressure information from the acquisition module and convert the pressure information into data format to send to the human-machine interaction module. It also receives pressure relief diaphragm status information and pressure relief baffle status information from the input module, performs logical judgment based on the pressure relief baffle status information and pressure relief diaphragm status information, and sends a trip command to the output module when the fault conditions are met.

[0009] The output module is connected to the main control module and is used to cut off the power supply to the transformer after receiving a trip command;

[0010] The human-machine interaction module is connected to the main control module and is used to receive and display the pressure information sent by the main control module, and to set the pressure alarm threshold.

[0011] By employing the embodiments of the present invention, when a transformer encounters a high-energy arc fault, it can collect non-electrical information caused by the action of the pressure release system and issue an action signal after logical judgment to promptly cut off the power supply to the transformer, preventing the pressure wave from causing damage to other locations.

[0012] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the functional modules of the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram illustrating the principle of pressure analog quantity conversion in the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the input-output conversion principle of the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the trip command logic judgment of the transformer non-electrical quantity protection system according to an embodiment of the present invention. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] System Implementation Examples

[0022] According to an embodiment of the present invention, a transformer non-electrical quantity protection system is provided. Figure 1 This is a schematic diagram of a transformer non-electrical quantity protection system according to an embodiment of the present invention, as shown below. Figure 1 As shown, it specifically includes:

[0023] The module includes a data acquisition module, an input module, an output module, a main control module, a human-machine interface module, and a power supply module.

[0024] The acquisition module, connected to the main control module, is used to acquire the pressure information of the transformer and send the pressure information to the main control module; the pressure includes: air pressure and hydraulic pressure.

[0025] The data acquisition module includes: a current-type pressure sensor, a current-to-voltage conversion circuit, a low-pass filter circuit, a signal isolation circuit, and an AD conversion circuit;

[0026] The current-type pressure sensor is connected to the current-to-voltage circuit to collect the pressure of the transformer and convert the pressure into current, which is then sent to the current-to-voltage circuit. The output of the current-type pressure sensor is 4-20mA.

[0027] The current-to-voltage circuit, connected to the low-pass filter circuit, is used to convert the current sent by the current-type pressure sensor into voltage and send it to the low-pass filter circuit.

[0028] The low-pass filter circuit, connected to the signal isolation circuit, is used to receive the voltage sent by the current-to-voltage circuit, filter it, and then send it to the signal isolation circuit.

[0029] The signal isolation circuit, connected to the AD conversion circuit, is used to electrically isolate the filtered voltage before sending it to the AD conversion circuit.

[0030] The AD conversion circuit, connected to the main control module, is used to convert electrically isolated voltage into digital signals and send them to the main control module.

[0031] The input module, connected to the main control module, is used to collect the status of the pressure relief diaphragm and the pressure relief baffle of the transformer to obtain the pressure relief diaphragm status information and the pressure relief baffle status information. After processing the pressure relief diaphragm status information and the pressure relief baffle status information, it is sent to the main control module.

[0032] The input module is specifically used to collect the status of the pressure relief diaphragm and the pressure relief baffle of the transformer to obtain the pressure relief diaphragm status information and the pressure relief baffle status information. After electrically isolating and amplitude converting the pressure relief diaphragm status information and the pressure relief baffle status information, it is sent to the main control module.

[0033] The main control module receives pressure information from the acquisition module, converts the pressure information into a data format, and sends it to the human-machine interface module. It also receives pressure relief diaphragm status information and pressure relief baffle status information from the input module. Based on the pressure relief baffle status information and pressure relief diaphragm status information, it performs logical judgments and sends a trip command to the output module when the fault conditions are met. Specifically, the main control module performs logical judgments after debouncing the pressure relief diaphragm status information and pressure relief baffle status information. If two of the three pressure relief diaphragm status information channels are abnormal and the baffle is activated, it sends a trip command to the output module.

[0034] The main control module also includes: a storage module, used to receive and store pressure information sent by the acquisition module, send the stored information to the human-machine interaction module for display, and store the set pressure alarm threshold; and a fault analysis module, used to analyze the pressure information to determine the cause of the fault.

[0035] The output module is connected to the main control module and is used to cut off the power supply to the transformer after receiving a trip command;

[0036] The human-machine interaction module is connected to the main control module and is used to receive and display the pressure information sent by the main control module, and to set the pressure alarm threshold information.

[0037] The human-machine interaction module specifically includes: an LCD screen for displaying pressure information and fault causes, and buttons for calibrating the clock and setting alarm thresholds; the main control module is equipped with a clock for timing.

[0038] The power supply module supplies power to the main control module, and through the main control module, supplies power to the acquisition module, input module, and output module.

[0039] The power module is specifically used for:

[0040] The 220V AC / DC power supply is converted to 5V DC to power the main control module, while the acquisition module, input module, and output module are powered by isolated 24V DC power.

[0041] The system also includes a communication module, which is connected to the main control module. It is used to acquire the pressure relief diaphragm status information, pressure relief baffle status information, and pressure information from the main control module and send them to a remote computer. It also receives the time synchronization command and trip command issued by the remote computer and sends the time synchronization command and trip command to the main control module.

[0042] Figure 2 This is a schematic diagram of the structure of the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0043] The circuit described above generally includes: an analog signal acquisition module, a human-computer interaction module, a data processing module, an input / output module, a power supply module, and a communication module.

[0044] The function of the analog signal acquisition module is to convert the analog pressure signal into a digital signal through an AD conversion chip for acquisition and processing by the main CPU.

[0045] Human-computer interaction module functions: display the data size of analog quantities, view alarm report information, set communication parameters, alarm settings and alarm delay, etc.

[0046] The data processing module processes acquired analog and input status signals using algorithms, judges faults based on pre-defined logic, and issues trip commands when conditions are met. After a fault occurs, this module can store data before and after the fault, facilitating post-fault analysis. The module can transmit acquired data to a remote control system via a communication interface and simultaneously receive commands from the remote control system. A hardware watchdog timer ensures system reliability.

[0047] Input / output circuit functions: Input circuit: Collects the status of the three diaphragm circuits and the baffles in the pressure relief system. Output circuit: Can send a trip signal after an abnormal pressure, cut off the power supply to the transformer, and prevent the accident from escalating further.

[0048] Power supply module function: It adopts a switching power supply module to convert the input AC / DC 220V power supply into DC 5V power supply for the main system, and the input and output are isolated DC 24V power supply.

[0049] Figure 3 This is a schematic diagram of the functional modules of the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0050] General principle introduction:

[0051] The input circuit collects switch signals such as the diaphragm circuit status, baffle position status, and oil leakage switch status of the rapid pressure relief device. After photoelectric isolation, the external high voltage signal is converted into a low voltage signal for the main CPU to read in real time. The software performs anti-bouncing processing on the original switch status and uses it as the input condition for logic judgment. After the trip condition is met, a trip command is sent through the output circuit.

[0052] An output circuit is used to realize the output of alarm signals or trip commands, and opto-isolation chips are used to improve anti-interference performance.

[0053] The analog signal acquisition circuit acquires the pressure value at the installation location of the rapid pressure relief device. This circuit performs signal isolation and amplitude conversion of the pressure value, outputting a voltage signal that meets the input requirements of the analog-to-digital converter (ADC). The main CPU reads the output of the ADC, calculates the actual magnitude of the corresponding analog signal using a suitable algorithm, and then stores and performs logical judgments on it.

[0054] The data processing module incorporates a large-capacity external data storage and flash memory chip to store analog data and set parameters, respectively. A key function of this section is to perform logical function judgments and record and store fault data. When it is determined that an overpressure has caused the explosion-proof diaphragm to rupture, a trip command is issued, and the pressure values ​​before and after the fault are stored to provide reference data for subsequent fault analysis.

[0055] The communication module can transmit the collected data to a remote monitoring computer, and can also receive time synchronization commands and remote control commands issued by the remote computer.

[0056] The technical solution of the present invention:

[0057] Figure 4 This is a schematic diagram illustrating the principle of pressure analog quantity conversion in the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0058] The pressure sensor used for acquisition is a current-type pressure sensor with an output of 4-20mA. Current-type sensors have a long transmission distance and strong anti-interference capability. The input current signal is converted into a voltage signal through a current-to-voltage circuit, during which the voltage amplitude is conditioned. After passing through a low-pass filter circuit to eliminate interference signals, it passes through a signal isolation circuit. This provides electrical isolation between the input and output circuits, improving anti-interference capability. The analog-to-digital converter converts the input voltage signal into discrete digital values. The main CPU system acquires this signal in real time and performs storage and logical judgment.

[0059] Figure 5 This is a schematic diagram of the input-output conversion principle of the transformer non-electrical quantity protection system according to an embodiment of the present invention;

[0060] The pressure relief device outputs three diaphragm circuit monitoring nodes to indicate the status of the diaphragm circuit. During transformer operation, when the pressure is within the normal range, the diaphragm circuit monitoring nodes are normally open. When the pressure exceeds the limit, the pressure relief valve activates, the normally open node output by the diaphragm rupture closes, and a diaphragm abnormality signal is sent. After the diaphragm ruptures, transformer oil is sprayed through the pressure relief device, triggering a baffle switch, whose normally open node closes, sending a baffle activation signal.

[0061] The position status of the three diaphragm circuits and the baffle switch is electrically isolated and amplitude-converted via optocouplers to improve anti-interference capability. The amplitude conversion transforms external high-voltage signals into low-voltage signals for real-time acquisition and logical judgment by the main CPU system, which then determines whether to output a trip command based on the logical judgment result. When any two of the three diaphragm circuits are detected to be abnormal, and the baffle switch is activated simultaneously, it is determined that the pressure relief protection system has been activated, the internal pressure of the transformer has exceeded the limit, and a trip command needs to be issued to cut off the power supply to the transformer and prevent secondary disasters caused by transformer explosion and fire.

[0062] Figure 6 This is a schematic diagram of the trip command logic judgment of the transformer non-electrical quantity protection system according to an embodiment of the present invention. It illustrates the logic judgment for issuing a trip command when the diaphragm circuit is abnormal.

[0063] This invention collects the status of the three diaphragm circuits of the pressure relief protection system in real time, uses a two-out-of-three logic for judgment, and combines the action signal of the baffle switch to output a trip command to cut off the power supply to the transformer, prevent the transformer from exploding and catching fire, and avoid secondary disasters caused by the fault.

[0064] This invention collects transformer pressure data in real time. When a transformer malfunctions and the internal pressure rises, the pressure relief protection system is activated and oil is injected to relieve the pressure. The changes in pressure values ​​before and after the activation are recorded, providing analytical data for finding the cause of the accident.

[0065] When a transformer encounters a high-energy arc fault, this invention can collect non-electrical information caused by the action of the pressure release system and issue an action signal after logical judgment to cut off the power supply to the transformer in a timely manner, preventing the pressure wave from causing damage to other locations.

[0066] This invention collects the status of three independent diaphragm circuits in the pressure relief protection system. Based on any two diaphragm circuits showing anomalies, it initially determines that the transformer's internal pressure is abnormal. Simultaneously, it collects the status of the baffle switch to further confirm that the pressure relief protection system has activated, issuing a trip command to disconnect the transformer's power supply. Using this logic algorithm ensures that false trip commands are not issued, thus preventing malfunctions and improving the reliability of the operation.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions to the technical solutions of the embodiments of the present invention do not cause the essence of the corresponding technical solutions to deviate from the scope of the present solution.

Claims

1. A transformer non-electric quantity protection system, characterized in that, The application relates to a transformer pressure leakage alarm device. The device comprises a collection module, an input module, an output module, a main control module, a man-machine interaction module and a power module. The collection module is connected with the main control module and is used for collecting the internal pressure of a transformer to obtain pressure information and sending the pressure information to the main control module. The input module is connected with the main control module and is used for collecting the pressure leakage diaphragm state and the pressure leakage baffle state of the transformer to obtain pressure leakage diaphragm state information and pressure leakage baffle state information, processing the pressure leakage diaphragm state information and the pressure leakage baffle state information, and sending the processed information to the main control module; the pressure leakage baffle state information is a baffle position state. The main control module is used for receiving the pressure information sent by the collection module, converting the data format of the pressure information, sending the converted data format to the man-machine interaction module, receiving the pressure leakage diaphragm state information and the pressure leakage baffle state information sent by the input module, and sending a trip instruction to the output module if two of the three pressure leakage diaphragm state information are abnormal and the baffle is in action. The output module is connected with the main control module and is used for receiving the trip instruction and cutting off the power supply of the transformer. The man-machine interaction module is connected with the main control module and is used for receiving the pressure information sent by the main control module and displaying the pressure information and setting a pressure alarm threshold. The power module is used for supplying power to the main control module and supplying power to the collection module, the input module and the output module through the main control module. The collection module comprises a current type pressure sensor, a current-to-voltage circuit, a low-pass filter circuit, a signal isolation circuit and an AD conversion circuit. The current type pressure sensor is connected with the current-to-voltage circuit and is used for collecting the pressure of the transformer and converting the pressure into current to send the current to the current-to-voltage circuit. The current-to-voltage circuit is connected with the low-pass filter circuit and is used for converting the current sent by the current type pressure sensor into voltage to send the voltage to the low-pass filter circuit. The low-pass filter circuit is connected with the signal isolation circuit and is used for receiving the voltage sent by the current-to-voltage circuit, filtering the voltage and sending the filtered voltage to the signal isolation circuit. The signal isolation circuit is connected with the AD conversion circuit and is used for electrically isolating the filtered voltage and sending the electrically isolated voltage to the AD conversion circuit. The AD conversion circuit is connected with the main control module and is used for converting the electrically isolated voltage into a digital signal to send the digital signal to the main control module.

2. The system of claim 1, wherein, The input module is specifically used for collecting the pressure leakage diaphragm state and the pressure leakage baffle state of the transformer to obtain the pressure leakage diaphragm state information and the pressure leakage baffle state information, electrically isolating and amplitude converting the pressure leakage diaphragm state information and the pressure leakage baffle state information, and sending the electrically isolated and amplitude converted information to the main control module.

3. The system of claim 1, wherein, The main control module further comprises a storage module which is used for receiving the pressure information sent by the collection module and storing the pressure information, sending the stored information to the man-machine interaction module for display, and storing the set pressure alarm threshold.

4. The system of claim 1, wherein, The main control module further comprises a fault analysis module which is used for analyzing the fault reason according to the pressure information.

5. The system of claim 4, wherein, The man-machine interaction module specifically comprises a liquid crystal screen used for displaying the pressure information and the fault reason, and a button used for calibrating a clock and setting an alarm threshold; the main control module is provided with the clock used for timing.

6. The system of claim 1, wherein, The master control module is specifically used for performing anti-shake processing on the pressure relief diaphragm state information and the pressure relief baffle state information, and performing logical judgment.

7. The system of claim 1, wherein, The power module is specifically used for: The 220V AC / DC power supply is converted into 5V DC to supply power to the master control module, and the acquisition module, the input module and the output module are powered by an isolated 24V DC power supply.

8. The system of claim 1, wherein, The current type pressure sensor outputs 4-20mA.

9. The system of claim 1, wherein, The system further comprises a communication module connected with the master control module, configured to send the pressure relief diaphragm state information, the pressure relief baffle state information and the pressure information in the master control module to a remote computer, receive a calibration clock command and a trip instruction issued by the remote computer, and send the calibration clock command and the trip instruction to the master control module.

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