Online monitoring system for dissolved gas in transformer oil

Abstract

The utility model discloses an on-line monitoring system for gas dissolved in transformer oil, and belongs to the technical field of transformers. Comprising a transformer, the bottom of the transformer is provided with a carrier gas unit, the bottom of the carrier gas unit is provided with a degassing unit, one end of the degassing unit is provided with a detection analysis unit, and the bottom of a data acquisition card is provided with an IED unit. According to the utility model, gas in oil can be conveniently separated through the degassing unit, gas to be detected is injected into the chromatographic column, multi-component special gas to be detected which flows into the chromatographic column is separated into single-component gas under the action of the filler, the single-component gas sequentially flows out, and heat on the detector is taken away through catalytic reaction; a voltage signal of the detector is converted into a digital sequence signal, the digital sequence signal is uploaded to the IED unit, and measurement and acquisition of data are completed. The device disclosed by the utility model is compact and reasonable in structural design, convenient for measuring each component and concentration of the gas to be measured, high in control sensitivity and accuracy, and convenient for separating and detecting the dissolved gas in the transformer oil.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field more specifically, relate to a kind of transformer oil dissolved gas on-line monitoring system. BACKGROUND

[0002] In the equipment operation and maintenance of modern electric power industry, safety requirement is extremely strict, the key transformer of power plant or power station operation, especially the monitoring of long-term fault gas, partial discharge, winding deformation etc. of transformer that has found abnormal, preliminary diagnostic information can be obtained from test result, is important basis for preventing control and maintaining safe service and operation cost of electric power department.

[0003] General gas chromatography is applied to the measurement and analysis of the dissolved characteristic gas in transformer oil, as important basis for whether the equipment of electric power department is normal operation. Offline method, due to its measurement cycle is longer, degassing process error is larger, test method influence factor is more, it is difficult to meet the requirements of safety production and condition-based maintenance. Therefore, the application of on-line monitoring system of multiple fault gases in transformer oil becomes urgent demand.

[0004] Although the device has many beneficial effects, but still exist following problems: the device in use, it is not convenient to determine the components and concentration of the gas to be measured, the sensitivity of control and the accuracy of the device are insufficient;Secondly, the device in use is not convenient for separating and detecting the dissolved gas in transformer oil, needs improvement, in view of this, we propose a kind of transformer oil dissolved gas on-line monitoring system. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of transformer oil dissolved gas on-line monitoring system to solve the problems of not being convenient for determining the components and concentration of the gas to be measured, the sensitivity of control and the accuracy of the device are insufficient, not being convenient for separating and detecting the dissolved gas in transformer oil in the above background technology.

[0006] Its technical scheme is:

[0007] A kind of transformer oil dissolved gas on-line monitoring system, including transformer, the bottom of the transformer is equipped with carrier gas unit, the bottom of the carrier gas unit is equipped with degassing unit, one end of the degassing unit is equipped with detection analysis unit, the detection analysis unit includes chromatographic column box, the inside of the chromatographic column box is equipped with chromatographic column, the chromatographic column circumferential outer wall is equipped with heating and temperature acquisition, the other end of the chromatographic column is equipped with detector, the side wall of the heating and temperature acquisition is equipped with temperature controller, the bottom of the detector is equipped with data acquisition card, the bottom of the data acquisition card is equipped with IED unit.

[0008] Preferably, the detection analysis unit comprises a degassing module, a steel pipe is arranged on the sidewall of the degassing module, a gas collecting module is arranged at one end of the steel pipe, and a sample feeding module is arranged at the output end of the gas collecting module.

[0009] Preferably, the sample feeding module comprises a constant volume ring, and the constant volume ring is provided with a six-way valve at one end.

[0010] Preferably, the degassing module is a vacuum degassing machine, and the gas collecting module is a high-precision air cylinder.

[0011] Preferably, the data acquisition card is connected with the IED unit through an RS485 interface, the IED unit adopts a TK-RTOS real-time operating system, and the data acquisition card is composed of an STM32F1 and an AD7124.

[0012] Preferably, the degassing module is provided with an oil inlet at the top, and an oil return port is arranged on one side of the oil inlet.

[0013] Beneficial effects, compared with the prior art, the advantages of the utility model lie in:

[0014] The utility model discloses a degassing unit is inputted to the gas after separation to the inside of chromatographic column, and the chromatographic column is separated into single component gas under the action of filler to the multi-component gas to be measured of flowing in, and sequentially flows out, and the heat on the detector is taken away through catalytic reaction, and the change is converted into the change of electric signal through Wheatstone bridge, and the voltage signal of conversion detector is converted into digital sequence signal through high-precision A / D converter and differential sampling circuit, and is uploaded IED unit, and the signal after DSP digital filtering of these digital sequence signals carries the relevant information of gas concentration, and the measurement and collection of data are completed.

[0015] Secondly, the degassing module realizes the circulation and quantitative oil taking of transformer oil, facilitates the separation of gas in oil, the gas collecting module is used for temporarily storing the measured gas, prevents escape, and realizes the sample feeding of the measured gas after collecting a certain volume through the sample feeding module, the utility model discloses compact and reasonable structure design, and the concentration of each component of the measured gas is convenient for determination, the sensitivity of control and the accuracy of device are high, and it is convenient for separating and detecting the dissolved gas in transformer oil. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the whole structure schematic view of the utility model discloses;

[0017] Figure 2 It is the partial structure schematic view of the utility model discloses;

[0018] Figure 3 It is the partial structure schematic view of the carrier gas unit of the utility model discloses;

[0019] Figure 4 Part structure schematic diagram of the degassing unit of the utility model;

[0020] Figure 5 Part structure split schematic diagram of the utility model;

[0021] Label explanation in the drawing: 1, transformer;2, carrier gas unit;3, degassing unit;4, detection analysis unit;5, IED unit;6, chromatographic column box;7, chromatographic column;8, heating and temperature acquisition;9, detector;10, temperature controller;11, data acquisition card;12, degassing module;13, steel pipe;14, gas collection module;15, sample injection module;16, quantitative ring;17, six-way valve;18, oil inlet;19, oil return port. DETAILED DESCRIPTION

[0022] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited.

[0024] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] Please refer to Figures 1-5 , the utility model provides a technical scheme:

[0026] The utility model provides an on -line monitoring system of transformer oil dissolved gas, including transformer 1, the bottom of transformer 1 is equipped with carrier gas unit 2, the bottom of carrier gas unit 2 is equipped with degassing unit 3, and one end of degassing unit 3 is threadedly connected with detection analysis unit 4, and detection analysis unit 4 includes chromatographic column box 6, and the inside of chromatographic column box 6 is equipped with chromatographic column 7, and the circumferential outer wall of chromatographic column 7 is equipped with heating and temperature acquisition 8, and one end of chromatographic column 7 is threadedly connected with detector 9, and the side wall of heating and temperature acquisition 8 is equipped with temperature controller 10, and the bottom of detector 9 is electrically connected with data acquisition card 11, and the bottom of data acquisition card 11 is clamped with IED unit 5, the utility model discloses a gas is input to the inside of chromatographic column 7 through degassing unit 3 after separation, and the chromatographic column 7 is separated into single component gas under the action of filler under the inflow of multiple component characteristic gas to be measured, and sequentially flows out, and the heat on the detector 9 is taken away through catalytic reaction, and the change is converted into the change of electric signal through Wheatstone bridge, and the voltage signal of conversion detector 9 is converted into digital sequence signal by high-precision A / D converter and differential sampling circuit, and is uploaded IED unit 5, and the signal after DSP digital filtering of these digital sequence signals carries the relevant information of gas concentration, and the measurement and collection of data are completed.

[0027] Specifically, detection analysis unit 4 includes degassing module 12, steel pipe 13 is fixedly arranged on the side wall of degassing module 12, gas collection module 14 is fixedly arranged on one end of steel pipe 13, and sample injection module 15 is fixedly arranged on the output end of gas collection module 14. The degassing module 12 realizes the circulation and quantitative oil taking of the transformer 1 oil, facilitates the separation of the gas in the oil, and the gas collection module 14 is used for temporarily storing the to-be-measured gas to prevent escape, and the sample injection module 15 realizes the sample injection of the to-be-measured gas after collecting a certain volume.

[0028] Further, the sample injection module 15 includes a quantitative ring 16, and a six-way valve 17 is fixedly arranged on one end of the quantitative ring 16. The cooperation of the high quantitative ring 16 and the six-way valve 17 ensures the consistency of the sample injection amount, and further ensures the repeatability of the device.

[0029] It is worth noting that the degassing module 12 is a vacuum degassing machine, and the gas collection module 14 is a high-precision air cylinder. The degassing module 12 of the vacuum degassing machine facilitates better separation of oil gas.

[0030] It is worth noting that the data acquisition card 11 is connected with the IED unit 5 through the RS485 interface, the IED unit 5 adopts the TK-RTOS real-time operating system, and the data acquisition card 11 is composed of the STM32F1 and the AD7124. The high-precision data acquisition card 11 composed of the STM32F1 and the AD7124 facilitates the on-site sensor data acquisition, avoids the measurement disturbance caused by the long-distance transmission of the analog quantity from the root, improves the accuracy of the device, and improves the autonomy through the IED unit 5 of the TK-RTOS real-time operating system, so that the multi-task operation has higher real-time performance.

[0031] In addition, the degassing module 12 is fixedly provided with an oil inlet 18 at the top, and an oil return port 19 is fixedly arranged on one side of the oil inlet 18. Through the oil inlet 18 and the oil return port 19, the oil circulation is facilitated, and it is ensured that the analyzed oil sample can reflect the real oil sample in the transformer 1.

[0032] Working principle: when the device needs to perform online monitoring of dissolved gas in transformer oil, the degassing module 12 is placed at the bottom of the transformer 1. In the initial state, the preheating of the chromatographic column box 6 is realized through the IED unit 5 control heating and temperature acquisition 8, the temperature controller 10, the carrier gas unit 2 is turned on, the carrier gas flows through the sample introduction module 15 to the chromatographic column box 6 to realize the purging work of the chromatographic column 7 and the detector 9, after completion, the degassing module 12 is communicated with the transformer 1, the transformer oil is driven by the degassing module 12 to enter the degassing module 12 through the oil inlet 18 and then return to the transformer through the oil return port 19, the transformer oil in the pipeline is updated, and the oil circuit is completed. After the circulation is completed, the degassing module 12 extracts a quantitative oil sample from the transformer 1, opens the degassing module 12 to separate the oil and gas, the separated to-be-measured characteristic gas enters the gas collection module 14 and is stored, when enough to-be-measured gas is collected, the gas collection module 14 transfers the to-be-measured gas to the sample introduction module 15, the to-be-measured gas enters the chromatographic column box 7 under the pushing of the carrier gas in the sample introduction module 15, the chromatographic column 7 is separated into single-component gas which enters the detector 9 in turn, the detector 9 converts the gas concentration value into a voltage signal, and the voltage signal is converted into a digital sequence signal by the data acquisition card 11 and is uploaded to the IED unit 5 through the RS485 communication line or the network cable.

[0033] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An on-line monitoring system of dissolved gases in transformer oil, comprising a transformer (1), characterized in that: The transformer (1) bottom is equipped with carrier gas unit (2), carrier gas unit (2) bottom is equipped with degassing unit (3), degassing unit (3) one end is equipped with detection analysis unit (4), detection analysis unit (4) includes chromatographic column box (6), chromatographic column box (6) inside is equipped with chromatographic column (7), chromatographic column (7) circumference outer wall is equipped with heating and temperature acquisition (8), chromatographic column (7) the other end is equipped with detector (9), heating and temperature acquisition (8) side wall is equipped with temperature controller (10), detector (9) bottom is equipped with data acquisition card (11), data acquisition card (11) bottom is equipped with IED unit (5).

2. The transformer oil dissolved gas online monitoring system of claim 1, wherein: The detection analysis unit (4) includes degassing module (12), the degassing module (12) side wall is equipped with steel pipe (13), the steel pipe (13) one end is equipped with gas collection module (14), the gas collection module (14) output is equipped with sample introduction module (15).

3. The transformer oil dissolved gas online monitoring system of claim 2, wherein: The sample introduction module (15) includes a quantitative ring (16), the quantitative ring (16) one end is equipped with six-way valve (17).

4. The transformer oil dissolved gas online monitoring system of claim 3, wherein: The degassing module (12) is a vacuum degassing machine, and the gas collection module (14) is a high-precision air cylinder.

5. The transformer oil dissolved gas online monitoring system of claim 4, wherein: The data acquisition card (11) and the IED unit (5) are connected through the RS485 interface, the IED unit (5) adopts the TK-RTOS real-time operating system, and the data acquisition card (11) is composed of STM32F1 and AD7124.

6. The transformer oil dissolved gas online monitoring system of claim 5, wherein: The degassing module (12) top is equipped with oil inlet (18), oil inlet (18) one side is equipped with oil return port (19).

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