Gas current transformer

Abstract

The invention belongs to the technical field of electrical equipment detection, and particularly relates to a gas current transformer, which comprises a gas sampling module, a gas analysis module and a power supply module for supplying power to the whole transformer, and the other end of the gas sampling module is fixed on the shell of the gas current transformer and is inserted into the gas analysis module. According to the gas sampling device, the design that the gas sampling device is arranged in the gas current transformer in a sealed mode is adopted, the complexity that drilling or dismounting operation needs to be conducted outside the transformer in a traditional gas sampling mode is avoided, the operation difficulty is lowered, and meanwhile potential damage to the structure and performance of the transformer is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment detection, and in particular relates to a gas current transformer. Background Art

[0002] In the power system, gas current transformers, as an important power equipment, play a key role in current conversion and insulation isolation. In order to ensure its stable and safe operation, it is particularly important to monitor the gas composition inside the transformer in real time. The gas composition inside the transformer not only reflects the operating status of the equipment, but is also closely related to its insulation performance and safety.

[0003] With the development of power systems and the increasing requirements for the safety performance of power equipment, existing gas current transformers have exposed some problems and urgently need to be improved and optimized.

[0004] First, the existing system has deficiencies in gas sampling. Traditional gas sampling methods usually require drilling or disassembly operations outside the transformer, which not only increases the complexity of the operation, but also may damage the structure and performance of the transformer. At the same time, due to the single sampling point, the sampling process is easily interfered by environmental factors, which affects the accuracy of the sampling results.

[0005] Secondly, the existing system also has certain limitations in gas analysis. Traditional gas analysis instruments are mostly desktop or portable devices, which are large in size and not convenient to be directly installed inside the transformer for real-time monitoring. In addition, the connection between the analysis instrument and the sampling module is not flexible and convenient, which limits the response speed and detection efficiency of the entire detection system. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a gas current transformer to solve the above-mentioned technical problems.

[0007] A gas current transformer comprises a gas sampling module, a gas analysis module and a power module for supplying power to the entire transformer. One end of the gas sampling module is sealed and arranged inside the gas current transformer, and the other end of the gas sampling module is fixed on the housing of the gas current transformer and plugged into the gas analysis module.

[0008] Further improvements of the technical solution include: the gas sampling module includes a gas sampling probe and a sampling pipeline, the gas sampling probe is arranged inside the gas current transformer, the gas sampling probe is connected to the gas analysis module through the sampling pipeline, a sealing cover is provided at the end of the sampling pipeline away from the gas sampling probe, the sealing cover and the sampling pipeline are detachably sealed, and the outer wall of one end of the sampling pipeline close to the sealing cover is fixedly sealed and connected to the shell of the gas current transformer; after removing the sealing cover, the end of the sampling pipeline away from the gas sampling probe is plugged into the gas analysis module.

[0009] A further improvement of the technical solution is that the gas analysis module includes a shell, which is provided with a plug interface matching the sampling pipeline, and a gas detection unit, a detection signal processing unit and a signal analysis unit are provided in the shell, and the output end of the gas detection unit is connected to the input end of the signal analysis unit through the detection signal processing unit.

[0010] A further improvement of the technical solution is that a display screen is also provided on the housing, and the display screen is connected to the output end of the signal analysis unit.

[0011] A further improvement of the technical solution is that the gas detection unit includes a gas sensor array for detecting various components and their concentrations in the gas sample.

[0012] A further improvement of the present technical solution is that the detection signal processing unit includes a signal amplification circuit, a filtering circuit, an optocoupler isolation circuit and an analog-to-digital conversion circuit, and the output end of the gas detection unit is connected to the input end of the signal analysis unit through the signal amplification circuit, the filtering circuit, the optocoupler isolation circuit and the analog-to-digital conversion circuit in sequence.

[0013] A further improvement of the technical solution is that the signal amplification circuit includes an amplifier U1, a resistor R1, a capacitor C1, a capacitor C2 and a resistor R2; The inverting input terminal of the amplifier U1 is connected to the output terminal of the gas detection unit, the non-inverting input terminal of the amplifier U1 is grounded through the resistor R1, the gain setting pin of the amplifier U1 is connected to the ground pin of the amplifier U1 through the resistor R2, the positive power supply pin of the amplifier U1 is connected to the +5V power supply, the negative power supply pin of the amplifier U1 is connected to the -5V power supply, the reference voltage pin of the amplifier U1 is grounded, the reference voltage pin of the amplifier U1 is connected to the first end of the capacitor C1 and the first end of the capacitor C2, the second end of the capacitor C1 is connected to the +5V power supply, the second end of the capacitor C2 is connected to the -5V power supply, and the output terminal of the amplifier U1 is connected to the input terminal of the filter circuit.

[0014] A further improvement of the technical solution is that the filter circuit includes a capacitor C3, a resistor R3, an amplifier U2, a resistor R4, a resistor R5 and a capacitor C4; A first end of capacitor C3 is connected to the output end of amplifier U1, a second end of capacitor C3 is connected to a first end of resistor R3 and a non-inverting input end of amplifier U2, a second end of resistor R3 is grounded, an inverting input end of amplifier U2 is grounded through resistor R4, an output end of amplifier U2 is connected to a first end of resistor R5, a first end of capacitor C4 and an input end of an optocoupler isolation circuit, and a second end of resistor R5 and a second end of capacitor C4 are both connected to an inverting input end of amplifier U2.

[0015] A further improvement of the technical solution is that the optocoupler isolation circuit includes an optocoupler isolator of model HCNR201, the input end of the optocoupler isolator is connected to the output end of the amplifier U2, and the output end of the optocoupler isolator is connected to the input end of the analog-to-digital conversion circuit.

[0016] A further improvement of the technical solution is that the analog-to-digital conversion circuit includes an analog-to-digital conversion chip of model ADC0804LCN.

[0017] The beneficial effect of the present invention is that the present invention adopts a design of sealing inside the gas current transformer, which avoids the complexity of drilling or disassembly operations outside the transformer in the traditional gas sampling method, reduces the difficulty of operation, and also reduces the potential damage to the structure and performance of the transformer. The gas sampling probe is directly arranged inside the transformer, which can more accurately obtain the gas composition information inside the transformer, avoids the interference of environmental factors on the sampling process, and thus improves the accuracy of the sampling results. A sealing cover is arranged at one end of the sampling pipeline away from the gas sampling probe, which is detachably sealed and connected to the sampling pipeline, which is convenient for maintenance and replacement when necessary, and at the same time ensures the airtightness of the entire gas current transformer. A gas detection unit, a detection signal processing unit and a signal analysis unit are arranged in the shell, forming a complete detection link. The gas detection unit can accurately detect the gas composition, the detection signal processing unit amplifies and filters the detection signal, and the signal analysis unit analyzes and judges the processed signal, thereby improving the detection accuracy and reliability.

[0018] In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the structure of the gas current transformer.

[0021] Figure 2 This is the schematic diagram of the signal amplification circuit.

[0022] Figure 3 This is the schematic diagram of the filter circuit.

[0023] 111 is a gas sampling probe, 112 is a sampling pipeline, 120 is a gas analysis module, 121 is a gas detection unit, 122 is a signal amplification circuit, 123 is a filter circuit, 124 is an optocoupler isolation circuit, and 200 is a gas current transformer. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] like Figure 1 As shown, the present invention provides a gas current transformer, including a gas sampling module, a gas analysis module and a power supply module for powering the entire transformer. One end of the gas sampling module is sealed inside the gas current transformer, and the other end of the gas sampling module is fixed on the housing of the gas current transformer and plugged into the gas analysis module.

[0027] Specifically, the gas sampling module includes a gas sampling probe and a sampling pipeline. The gas sampling probe is arranged inside the gas current transformer. The gas sampling probe is connected to the gas analysis module through the sampling pipeline. A sealing cover is provided at the end of the sampling pipeline away from the gas sampling probe. The sealing cover and the sampling pipeline are detachably sealed and connected. The outer wall of one end of the sampling pipeline close to the sealing cover is fixedly sealed and connected to the shell of the gas current transformer. After removing the sealing cover, the end of the sampling pipeline away from the gas sampling probe is plugged into the gas analysis module.

[0028] In addition, the gas analysis module includes a shell, which is provided with a plug interface matching the sampling pipeline. A gas detection unit, a detection signal processing unit and a signal analysis unit are arranged in the shell. The output end of the gas detection unit is connected to the input end of the signal analysis unit through the detection signal processing unit.

[0029] Furthermore, a display screen is also provided on the housing, and the display screen is connected to the output end of the signal analysis unit.

[0030] In addition, the gas detection unit includes a gas sensor array for detecting various components and their concentrations in the gas sample. According to the detection requirements, it includes various types of gas sensors (SF6 gas sensors), such as electrochemical sensors, semiconductor sensors, infrared sensors, etc. Each sensor has high sensitivity to a specific gas or gas category and can measure its concentration in real time.

[0031] Specifically, the detection signal processing unit includes a signal amplification circuit, a filtering circuit, an optocoupler isolation circuit and an analog-to-digital conversion circuit, and the output end of the gas detection unit is connected to the input end of the signal analysis unit through the signal amplification circuit, the filtering circuit, the optocoupler isolation circuit and the analog-to-digital conversion circuit in sequence. Among them, the optocoupler isolation circuit includes an optocoupler isolator of model HCNR201, the input end of the optocoupler isolator is connected to the output end of the amplifier U2, and the output end of the optocoupler isolator is connected to the input end of the analog-to-digital conversion circuit; the analog-to-digital conversion circuit includes an analog-to-digital conversion chip of model ADC0804LCN, the input end of the analog-to-digital conversion chip is connected to the output end of the optocoupler isolation chip, and the output end of the analog-to-digital conversion chip is connected to the input end of the signal analysis unit; the signal analysis unit includes a single-chip microcomputer of model STM32F103C8.

[0032] like Figure 2 As shown, the signal amplification circuit includes an amplifier U1, a resistor R1, a capacitor C1, a capacitor C2 and a resistor R2; the inverting input terminal of the amplifier U1 is connected to the output terminal of the gas detection unit, the non-inverting input terminal of the amplifier U1 is grounded through the resistor R1, the gain setting pin of the amplifier U1 is connected to the ground pin of the amplifier U1 through the resistor R2, the positive power supply pin of the amplifier U1 is connected to the +5V power supply, the negative power supply pin of the amplifier U1 is connected to the -5V power supply, the reference voltage pin of the amplifier U1 is grounded, the reference voltage pin of the amplifier U1 is connected to the first end of the capacitor C1 and the first end of the capacitor C2, the second end of the capacitor C1 is connected to the +5V power supply, the second end of the capacitor C2 is connected to the -5V power supply, and the output terminal of the amplifier U1 is connected to the input terminal of the filter circuit. The amplifier U1 adopts an amplifier of model AD627.

[0033] like Figure 3As shown, the filtering circuit includes a capacitor C3, a resistor R3, an amplifier U2, a resistor R4, a resistor R5 and a capacitor C4; a first end of the capacitor C3 is connected to the output end of the amplifier U1, a second end of the capacitor C3 is connected to the first end of the resistor R3 and the non-inverting input end of the amplifier U2, a second end of the resistor R3 is grounded, an inverting input end of the amplifier U2 is grounded through the resistor R4, an output end of the amplifier U2 is connected to a first end of the resistor R5, a first end of the capacitor C4 and an input end of the optocoupler isolation circuit, and a second end of the resistor R5 and a second end of the capacitor C4 are both connected to the inverting input end of the amplifier U2.

[0034] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A gas current transformer, characterized in that: It includes a gas sampling module, a gas analysis module and a power supply module for powering the entire transformer. One end of the gas sampling module is sealed inside the gas current transformer, and the other end of the gas sampling module is fixed on the shell of the gas current transformer and plugged into the gas analysis module.

2. A gas current transformer according to claim 1, characterized in that: The gas sampling module includes a gas sampling probe and a sampling pipeline. The gas sampling probe is arranged inside the gas current transformer. The gas sampling probe is connected to the gas analysis module through the sampling pipeline. A sealing cover is arranged at the end of the sampling pipeline away from the gas sampling probe. The sealing cover and the sampling pipeline are detachably sealed. The outer wall of the end of the sampling pipeline close to the sealing cover is fixedly sealed with the shell of the gas current transformer. After removing the sealing cover, the end of the sampling pipeline away from the gas sampling probe is plugged into the gas analysis module.

3. A gas current transformer according to claim 2, characterized in that: The gas analysis module includes a shell, which is provided with a plug interface matching the sampling pipeline. A gas detection unit, a detection signal processing unit and a signal analysis unit are arranged in the shell. The output end of the gas detection unit is connected to the input end of the signal analysis unit through the detection signal processing unit.

4. A gas current transformer according to claim 3, characterized in that: The shell is also provided with a display screen, which is connected to the output end of the signal analysis unit.

5. A gas current transformer according to claim 3, characterized in that: The gas detection unit includes a gas sensor array for detecting various components and their concentrations in a gas sample.

6. A gas current transformer according to claim 3, characterized in that: The detection signal processing unit includes a signal amplification circuit, a filtering circuit, an optocoupler isolation circuit and an analog-to-digital conversion circuit. The output end of the gas detection unit is connected to the input end of the signal analysis unit through the signal amplification circuit, the filtering circuit, the optocoupler isolation circuit and the analog-to-digital conversion circuit in sequence.

7. A gas current transformer according to claim 6, characterized in that: The signal amplification circuit includes an amplifier U1, a resistor R1, a capacitor C1, a capacitor C2 and a resistor R2; The inverting input terminal of the amplifier U1 is connected to the output terminal of the gas detection unit, the non-inverting input terminal of the amplifier U1 is grounded through the resistor R1, the gain setting pin of the amplifier U1 is connected to the ground pin of the amplifier U1 through the resistor R2, the positive power supply pin of the amplifier U1 is connected to the +5V power supply, the negative power supply pin of the amplifier U1 is connected to the -5V power supply, the reference voltage pin of the amplifier U1 is grounded, the reference voltage pin of the amplifier U1 is connected to the first end of the capacitor C1 and the first end of the capacitor C2, the second end of the capacitor C1 is connected to the +5V power supply, the second end of the capacitor C2 is connected to the -5V power supply, and the output terminal of the amplifier U1 is connected to the input terminal of the filter circuit.

8. A gas current transformer according to claim 7, characterized in that: The filter circuit includes capacitor C3, resistor R3, amplifier U2, resistor R4, resistor R5 and capacitor C4; A first end of capacitor C3 is connected to the output end of amplifier U1, a second end of capacitor C3 is connected to a first end of resistor R3 and a non-inverting input end of amplifier U2, a second end of resistor R3 is grounded, an inverting input end of amplifier U2 is grounded through resistor R4, an output end of amplifier U2 is connected to a first end of resistor R5, a first end of capacitor C4 and an input end of an optocoupler isolation circuit, and a second end of resistor R5 and a second end of capacitor C4 are both connected to an inverting input end of amplifier U2.

9. A gas current transformer according to claim 8, characterized in that: The optocoupler isolation circuit includes an optocoupler isolator of model HCNR201, the input end of the optocoupler isolator is connected to the output end of the amplifier U2, and the output end of the optocoupler isolator is connected to the input end of the analog-to-digital conversion circuit.

10. A gas current transformer according to claim 9, characterized in that: The analog-to-digital conversion circuit includes an analog-to-digital conversion chip of model ADC0804LCN.

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