阅读说明：本技术 一种环保型气体绝缘变压器用绝缘混合气体在线监测装置 (Environment-friendly gas insulated transformer is with insulating gaseous mixture on-line monitoring device ) 是由 杨贤 罗颜 马志钦 卓然 邰彬 王邸博 唐念 成传晖 舒想 于 2021-10-12 设计创作，主要内容包括：本申请公开了一种环保型气体绝缘变压器用绝缘混合气体在线监测装置,涉及气体绝缘变压器技术领域,其中绝缘混合气体在线监测装置包括气体传感器组以及处理终端,气体传感器组包括第一气体传感器、第二气体传感器以及第三气体传感器；第一气体传感器用于检测待测变压器内的全氟异丁腈气体浓度；第二气体传感器用于检测待测变压器内的气压大小；第三气体传感器用于检测待测变压器内的氧气浓度；处理终端分别与第一气体传感器、第二气体传感器以及第三气体传感器电连接。本申请这一检测装置的设计,能够能够对全氟异丁腈/二氧化碳混合气体变压器实现高效全面的监测。(The application discloses an insulating mixed gas online monitoring device for an environment-friendly gas insulated transformer, and relates to the technical field of gas insulated transformers, wherein the insulating mixed gas online monitoring device comprises a gas sensor group and a processing terminal, and the gas sensor group comprises a first gas sensor, a second gas sensor and a third gas sensor; the first gas sensor is used for detecting the concentration of the perfluoroisobutyronitrile gas in the transformer to be detected; the second gas sensor is used for detecting the pressure in the transformer to be detected; the third gas sensor is used for detecting the oxygen concentration in the transformer to be detected; the processing terminal is electrically connected with the first gas sensor, the second gas sensor and the third gas sensor respectively. The design of this detection device of this application can realize high-efficient comprehensive monitoring to perfluor isobutyronitrile/carbon dioxide gas mixture transformer.)

1. An online monitoring device for an insulating mixed gas for an environment-friendly gas-insulated transformer is characterized by comprising a gas sensor group and a processing terminal;

the gas sensor group comprises a first gas sensor, a second gas sensor and a third gas sensor;

the first gas sensor is used for detecting the concentration of perfluoroisobutyronitrile gas in the transformer to be detected;

the second gas sensor is used for detecting the pressure in the transformer to be detected;

the third gas sensor is used for detecting the oxygen concentration in the transformer to be detected;

the processing terminal is respectively electrically connected with the first gas sensor, the second gas sensor and the third gas sensor, and is used for monitoring whether the gas concentration, the gas pressure and the oxygen concentration of the perfluoroisobutyronitrile in the transformer to be detected are all within respective corresponding preset range values according to the feedback data of the first gas sensor, the second gas sensor and the third gas sensor, and sending an alarm signal if the monitoring result is negative.

2. The online monitoring device for the insulating mixed gas for the environment-friendly gas-insulated transformer as claimed in claim 1, further comprising a background terminal with a display;

the background terminal is in wireless communication connection with the processing terminal.

3. The online monitoring device for the insulating mixed gas for the environment-friendly gas-insulated transformer as claimed in claim 1, further comprising an alarm device;

the processing terminal is electrically connected with the alarm device and is used for controlling the alarm device to send out an alarm signal.

4. The on-line monitoring device for the insulation mixed gas for the environment-friendly gas insulation transformer as claimed in claim 3, wherein the alarm device is an acoustic signal alarm device, an optical signal alarm device or an acousto-optic signal alarm device.

5. The on-line monitoring device for the insulation mixed gas for the environment-friendly gas insulation transformer as claimed in claim 1, wherein the gas sensor group is installed on the inner wall of the transformer to be tested.

6. The online monitoring device for the insulating mixed gas for the environment-friendly gas-insulated transformer as claimed in claim 5, wherein the first gas sensor, the second gas sensor and the third gas sensor are sequentially distributed from top to bottom.

Technical Field

The application relates to the technical field of gas-insulated transformers, in particular to an insulating mixed gas online monitoring device for an environment-friendly gas-insulated transformer.

Background

The Gas Insulated Transformer (GIT) has the characteristics of non-combustibility, non-explosiveness, low noise and the like, and is suitable for urban areas or underground substations with concentrated population and high requirements on fire prevention and explosion prevention. Currently, the GIT basically adopts SF₆(sulfur hexafluoride) gas acts as the main insulating and cooling medium. But due to SF₆The gas has strong greenhouse effect, and the greenhouse effect index (GWP) of the gas is CO₂23500 times of that, this type of gas is also increasingly being restricted in use, and therefore, the search for replacing SF in GIT₆Is also becoming more and more important.

Perfluoroisobutyronitrile (C), which was developed at the forefront of 3M company in recent years₄F₇N)/carbon dioxide (CO)₂) Mixed gas in SF₆The research and application of alternative gas is gradually becoming the mainstream technical route. Pure C₄F₇N is a less toxic gas belonging to category 4 (same category as ozone, ammonia) in the acute inhalation toxicity classification, although CO will be mixed when actually used in GIT₂Gases, whose toxicity is further reduced, still have a certain risk of inhalation and are therefore of particular importance for the monitoring of mixed gases. However, conventional C₄F₇N/CO₂Efficient and comprehensive monitoring for lack of mixed gas transformerAnd (6) testing the device.

Disclosure of Invention

In view of this, an object of the present application is to provide an online monitoring device for an insulation mixed gas for an environment-friendly gas-insulated transformer, which can realize efficient and comprehensive monitoring on a perfluoroisobutyronitrile/carbon dioxide mixed gas transformer.

In order to achieve the technical purpose, the application provides an insulating mixed gas online monitoring device for an environment-friendly gas insulated transformer, which comprises a gas sensor group and a processing terminal;

the gas sensor group comprises a first gas sensor, a second gas sensor and a third gas sensor;

the first gas sensor is used for detecting the concentration of perfluoroisobutyronitrile gas in the transformer to be detected;

the second gas sensor is used for detecting the pressure in the transformer to be detected;

the third gas sensor is used for detecting the oxygen concentration in the transformer to be detected;

the processing terminal is respectively electrically connected with the first gas sensor, the second gas sensor and the third gas sensor, and is used for monitoring whether the gas concentration, the gas pressure and the oxygen concentration of the perfluoroisobutyronitrile in the transformer to be detected are all within respective corresponding preset range values according to the feedback data of the first gas sensor, the second gas sensor and the third gas sensor, and sending an alarm signal if the monitoring result is negative.

Further, the system also comprises a background terminal with a display;

the background terminal is in wireless communication connection with the processing terminal.

Further, the device also comprises an alarm device;

the processing terminal is electrically connected with the alarm device and is used for controlling the alarm device to send out an alarm signal.

Further, the alarm device is a sound signal alarm device, a light signal alarm device or a sound and light signal alarm device.

Further, the gas sensor group is installed on the inner wall of the transformer to be tested.

Furthermore, the first gas sensor, the second gas sensor and the third gas sensor are distributed from top to bottom in sequence.

According to the technical scheme, the monitoring device is constructed by the gas sensor group and the processing terminal. The gas sensor group comprises a first gas sensor for detecting the concentration of perfluoroisobutyronitrile gas, a second gas sensor for detecting the pressure of the gas and a third gas sensor for detecting the concentration of oxygen. Through the detection to the gas concentration of perfluoroisobutyronitrile, the gas decomposition condition of the perfluoroisobutyronitrile in the equipment can be monitored, and then the equipment operation fault can be found in time and fed back to the maintainers, so that the maintenance can be carried out in time. The detection of the air pressure can monitor the operation pressure in the equipment, the air pressure of the filled perfluoroisobutyronitrile/carbon dioxide mixed gas and the air pressure of the equipment during operation, so as to accurately judge the operation state of the equipment. The detection of the oxygen concentration can be used for monitoring the sealing performance of the equipment and whether the purity of the perfluoroisobutyronitrile/carbon dioxide mixed gas meets the industrial standard of electrical equipment. The design of this detection device of this application can realize high-efficient comprehensive monitoring to perfluor isobutyronitrile/carbon dioxide gas mixture transformer.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an online monitoring device for an insulating mixed gas for an environment-friendly gas-insulated transformer provided in the present application;

fig. 2 is a schematic structural diagram of an online monitoring device for an insulating mixed gas for an environment-friendly gas-insulated transformer, which is provided in the present application, when the online monitoring device is applied to a transformer to be tested;

in the figure: 10. a gas sensor group; 1. a first gas sensor; 2. a second gas sensor; 3. a third gas sensor; 20. a processing terminal; 30. a background terminal; 40. a transformer to be tested; 41. perfluoroisobutyronitrile/carbon dioxide mixed gas; 42. an iron core; 43. a low-voltage coil; 44. a medium voltage coil; 45. a high voltage coil.

Detailed Description

The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

The applicant finds that the operating gas pressure of a gas insulated transformer is closely related to the insulation strength of equipment, and also finds that oxygen may be mixed when a perfluoroisobutyronitrile/carbon dioxide mixed gas is impure or the gas insulated transformer is not tightly sealed when the perfluoroisobutyronitrile/carbon dioxide mixed gas is filled, the perfluoroisobutyronitrile mixed gas can be decomposed due to the mixing of the oxygen, the insulation performance of electrical equipment is affected, metal elements in the equipment can be corroded, and the service life of the electrical insulation equipment is seriously affected.

Referring to fig. 1, an embodiment of an online monitoring device for an insulating mixed gas for an environment-friendly gas-insulated transformer provided in the embodiments of the present application includes:

the gas sensor group 10 and the processing terminal 20, the processing terminal 20 may be specifically a PLC control module, a microprocessor module, etc., without limitation. The gas sensor group 10 includes a first gas sensor 1, a second gas sensor 2, and a third gas sensor 3.

The first gas sensor 1 is used for detecting the concentration of perfluoroisobutyronitrile gas in a transformer to be detected, and is specifically a perfluoroisobutyronitrile gas concentration sensor; the second gas sensor 2 is used for detecting the pressure in the transformer to be detected, and is specifically a gas pressure sensor; the third gas sensor 3 is used for detecting the oxygen concentration in the transformer to be detected, and is specifically an oxygen concentration sensor; the processing terminal 20 is electrically connected to the first gas sensor 1, the second gas sensor 2, and the third gas sensor 3, and is configured to monitor whether the perfluoroisobutyronitrile gas concentration, the gas pressure, and the oxygen concentration in the transformer to be detected are within respective corresponding preset range values according to the feedback data of the first gas sensor 1, the second gas sensor 2, and the third gas sensor 3, and send an alarm signal if the monitoring result is negative.

Through the detection to the gas concentration of perfluoroisobutyronitrile, the gas decomposition condition of the perfluoroisobutyronitrile in the equipment can be monitored, and then the equipment operation fault can be found in time and fed back to the maintainers, so that the maintenance can be carried out in time. And the detection to atmospheric pressure size can know the sealed condition of equipment in real time, because the perfluoroisobutyronitrile gas has toxicity, when equipment operation atmospheric pressure changes, can know that equipment breaks down to ensure the reliability of environmental protection insulating transformer operation, reduced the pollution of perfluoroisobutyronitrile gas to the environment. The detection of the oxygen concentration can be used for monitoring the sealing performance of the equipment and whether the purity of the perfluoroisobutyronitrile/carbon dioxide mixed gas 41 meets the industrial standard of the electrical equipment. The design of this detection device of this application can realize high-efficient comprehensive monitoring to perfluor isobutyronitrile/carbon dioxide mist 41 transformer, conveniently guides the model machine or the daily operation maintenance of product.

The above is a first embodiment of the online monitoring device for the insulating mixed gas for the environment-friendly gas-insulated transformer provided in the embodiments of the present application, and the following is a second embodiment of the online monitoring device for the insulating mixed gas for the environment-friendly gas-insulated transformer provided in the embodiments of the present application, specifically referring to fig. 1 and fig. 2.

The scheme based on the first embodiment is as follows:

further, in order to facilitate remote supervision of the staff, the system further comprises a background terminal 30 with a display, and the background terminal 30 is in wireless communication connection with the processing terminal 20. Real-time data monitored by the gas sensor group 10 are transmitted to the processing terminal 20 through a signal line, the processing terminal 20 analyzes and processes transmitted data and sends the data to the background terminal 30, and the data are displayed to a worker through a display, so that the worker can know the working condition inside the insulating gas transformer in real time, and further can take corresponding measures in time when finding that the data are abnormal. The background terminal 30 may be an integrated computer, a mobile phone, a tablet, etc., and is not limited specifically.

Further, the alarm signal in the present application may be specifically realized by an alarm device, and the processing terminal 20 is electrically connected to the alarm device by adding a configuration alarm device, so as to control the alarm device to send out the alarm signal. Of course, the alarm signal may also be directly generated to the backend terminal 30 in the form of data information and displayed to the staff for knowing, and is not limited specifically.

Further, the alarm device may be a sound signal alarm device, a light signal alarm device, or a sound and light signal alarm device, and is not particularly limited.

In the present application, the iron core 42, the low voltage coil 43, the medium voltage coil 44, the high voltage coil 45, and the like are configured inside the transformer 40 to be tested, and the design may be specifically performed with reference to the existing transformer structure or the existing transformer structure may be directly used without limitation.

Further, the gas sensor group 10 may be mounted on the inner wall of the transformer 40 to be tested.

Further, since the higher the voltage level is, the larger the capacity of the transformer gas tank is, and the components of the mixed gas at different heights of the gas tank may have dispersibility after the mixed gas is filled, the gas tank surface using the mixed gas in the gas insulation transformer prototype or product, especially the corresponding gas sensors are arranged at different positions on the surface, in the middle and at the lower part, preferably, the first gas sensor 1, the second gas sensor 2 and the third gas sensor 3 are distributed in sequence from top to bottom.

Of course, the number of the gas sensor groups 10 in the present application may also be multiple, and a plurality of gas sensor groups 10 may also be dispersedly installed and fixed according to actual tests, so as to ensure better detection accuracy, and no limitation is specifically made.

The above detailed description is provided for the online monitoring device of the mixed insulating gas for the environmentally friendly gas insulated transformer, and for those skilled in the art, according to the ideas of the embodiments of the present application, there are variations in the specific implementation and application scope.