Remote monitoring system for decomposition condition of SF6 in transformer

Abstract

The utility model provides a remote monitoring system for the decomposition condition of SF6 in a transformer, which relates to the technical field of transformer substation monitoring and comprises a detection module, a signal conversion module, a data processing module, a communication module, a digital cloud and a receiving device. Analog signals of obtained regular monitoring signals or abnormal electric signals are converted into digital signals through the signal conversion module, then the digital signals are converted into analyzable information through the data processing module, and the processed information is remotely transmitted to a digital cloud through the communication module. And finally, a user receives real-time monitoring data from the cloud through the receiving equipment to realize real-time remote monitoring of the decomposition condition of the insulating gas of the transformer, and compared with a manual monitoring technology adopted at present, the monitoring method is more convenient, accurate and safe, and the defects in the aspect of the remote monitoring technology of the insulating gas of the transformer are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer substation monitoring, in particular to a remote monitoring system for SF6 decomposition in a transformer. Background Art

[0002] The transformer is one of the most important equipment in the substation. It mainly meets the needs of voltage change and loss reduction in the substation. It plays a vital role in the four links of power generation, transmission, distribution and consumption. It is the heart of the substation. Therefore, ensuring the normal operation of the transformer is an important guarantee for the safe, reliable and economical operation and power supply of the power system.

[0003] According to relevant statistics, nearly 90% of transformer failures are caused by insulation aging, which will reduce the power grid's ability to resist large current shocks, resulting in frequent voltage instability, short circuits, power outages and other faults, seriously endangering the life and property safety of maintenance personnel and electricity users. Therefore, real-time monitoring of transformer insulation aging is a necessary means to ensure the normal operation of the transformer and extend its service life.

[0004] The insulation strength of SF6 gas is relatively high, about 8.9kV / mm at standard atmospheric pressure, which is about 3 times that of air. At the same time, SF6 gas also has a strong arc extinguishing ability, about 100 times that of air. Therefore, SF6 gas is often used as an arc extinguishing and insulating medium and is widely used as an insulating gas for gas-insulated transformers. For electrical equipment in normal operation, the internal temperature is no higher than 80°C. Therefore, there will be no decomposition products of insulating materials such as SF6. However, if there are local discharge and local overheating faults inside the equipment, the sulfur hexafluoride gas in the fault area will decompose and the transformer insulation will age. At this stage, the technology mainly relies on inspection personnel to manually monitor the decomposition of transformer insulating gas, which is inefficient and lacks safety. It is impossible to perform real-time, accurate and safe monitoring. The remote monitoring technology available lacks internal monitoring of the transformer or is not accurate enough.

[0005] Therefore, we propose a remote monitoring system for SF6 decomposition in transformers. Utility Model Content

[0006] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a remote monitoring system for the decomposition of SF6 in a transformer, which effectively solves the problems in the background technology.

[0007] To achieve the above-mentioned object, the utility model provides the following technical solutions: a remote monitoring system for SF6 decomposition in a transformer, comprising a detection module, a signal conversion module, a data processing module, a communication module, a digital cloud and a receiving device;

[0008] The detection module is a gas-sensitive resistive sensor, which is used to detect the concentration of decomposed gas of SF6 insulating gas in the transformer in real time;

[0009] The signal conversion module is connected to the detection module, and includes a voltage signal amplifier and a single-chip digital-to-analog conversion module. The voltage signal amplifier is used to amplify the weak signal captured by the detection module, and the single-chip digital-to-analog conversion module is used to convert the analog signal into a digital signal.

[0010] The data processing module is connected to the single-chip microcomputer and the signal conversion module, and outputs data after performing logical calculations on the program in the single-chip microcomputer;

[0011] The communication module sends the output data of the data processing module to the digital cloud;

[0012] The receiving device receives real-time monitoring data from the digital cloud to realize real-time remote monitoring of the decomposition of transformer insulating gas.

[0013] Furthermore, the detection module, signal conversion module, data processing module and communication module are all installed at the transformer end and are powered uniformly after integration.

[0014] Furthermore, the digital cloud is a remote data receiving and storage terminal, and the receiving device is a user terminal.

[0015] Furthermore, the receiving device is a smart phone and a personal computer.

[0016] Furthermore, the communication module is a GPRS signal sending module, and the digital cloud is composed of a GPRS signal receiving module and a cloud server or a self-built server.

[0017] Furthermore, the detection module, signal conversion module, data processing module and communication module are electrically connected by modules, the communication module transmits data with the digital cloud, and the digital cloud and the receiving device transmit data by broadband mobile communication.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] Through the integrated design of detection module, signal conversion module, data processing module, communication module, digital cloud and receiving equipment, the detection module detects the decomposition gas concentration of the insulating gas SF6 in the transformer in real time. The obtained regular monitoring signal or abnormal electrical signal is converted into a digital signal through the signal conversion module, and then converted into analyzable information through the data processing module. The processed information is remotely transmitted to the digital cloud through the communication module. Finally, the user receives the real-time monitoring data from the cloud through the receiving device to realize the real-time remote monitoring of the decomposition of the transformer insulating gas. Compared with the currently used manual monitoring technology, it is a more convenient, accurate and safe monitoring method, which makes up for the shortcomings in the remote monitoring technology of transformer insulating gas and assists detection personnel to efficiently and safely monitor the decomposition of transformer insulating gas and prevent failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model provides a block diagram of a remote monitoring system for SF6 decomposition in a transformer. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant literature, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0025] Example 1

[0026] like Figure 1 As shown, the utility model provides a technical solution: a remote monitoring system for SF6 decomposition in a transformer, including a detection module, a signal conversion module, a data processing module, a communication module, a digital cloud and a receiving device;

[0027] The detection module is a gas-sensitive resistive sensor, which is used to detect the concentration of decomposed gas of SF6 insulating gas in the transformer in real time;

[0028] The signal conversion module is connected to the detection module. The signal conversion module includes a voltage signal amplifier and a single-chip digital-to-analog conversion module. The voltage signal amplifier is used to amplify the weak signal captured by the detection module. The single-chip digital-to-analog conversion module is used to convert the analog signal into a digital signal. The voltage signal amplifier is composed of an operational circuit. Its key component, the operational amplifier, has many models available on the market.

[0029] The data processing module is connected to the single-chip microcomputer and the signal conversion module, and the program in the single-chip microcomputer is logically calculated and then the data is output. The STM32F103C8T6 is used for digital-to-analog conversion and information processing functions, and the STM32F103C8T6 programming is used to realize the logical calculation of the obtained voltage information and generate the processed information signal;

[0030] The communication module sends the output data of the data processing module to the digital cloud;

[0031] The receiving device receives real-time monitoring data from the digital cloud to realize real-time remote monitoring of the decomposition of transformer insulation gas.

[0032] Example 2

[0033] like Figure 1 As shown, the detection module, signal conversion module, data processing module and communication module are all installed at the transformer end and are powered uniformly after integration.

[0034] The digital cloud is the remote data receiving and storage end, and the receiving device is the user end.

[0035] The receiving devices are smartphones and personal computers.

[0036] The communication module is a GPRS signal sending module, and the digital cloud consists of a GPRS signal receiving module and a cloud server or a self-built server.

[0037] The detection module, the signal conversion module, the data processing module and the communication module are electrically connected, the communication module and the digital cloud are used for data transmission, and the digital cloud and the receiving device are used for data transmission by broadband mobile communication.

[0038] The working process of the utility model is as follows: when using a remote monitoring system for the decomposition of SF6 in a transformer, first, when the transformer is operating normally, a detection module composed of a gas-sensitive resistive sensor transmits a normal voltage signal to a signal conversion module regularly (such as one hour). When the transformer has SF6 insulating gas decomposition, the sensor resistance changes, the voltage value is abnormal, and the abnormal voltage signal is transmitted to the signal conversion module, wherein the voltage signal amplifier amplifies the signal and transmits it to the single-chip microcomputer digital-to-analog conversion plate. After the signal conversion, a logical operation is directly performed in the single-chip microcomputer, and the operation result is directly connected to the communication module for data transmission. STM32F103C8T6 is used for digital-to-analog conversion and information processing functions, and it is directly connected to the GPRS communication module. STM32F103C8T6 programming is used to realize the logical calculation of the obtained voltage information and generate a processed information signal. The information is transmitted to the GPRS communication module, and the communication module sends the information to a cloud server or a self-built server. By building a web program, maintenance personnel can access the server from a mobile phone or a personal computer, thereby realizing the monitoring of the decomposition of the transformer insulating gas and deciding whether to perform maintenance work on the transformer.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A remote monitoring system for SF6 decomposition in a transformer, characterized by: It includes detection module, signal conversion module, data processing module, communication module, digital cloud and receiving equipment; The detection module is a gas-sensitive resistive sensor, which is used to detect the concentration of decomposed gas of SF6 insulating gas in the transformer in real time; The signal conversion module is connected to the detection module, and includes a voltage signal amplifier and a single-chip digital-to-analog conversion module. The voltage signal amplifier is used to amplify the weak signal captured by the detection module, and the single-chip digital-to-analog conversion module is used to convert the analog signal into a digital signal. The data processing module is connected to the single-chip microcomputer and the signal conversion module, and outputs data after performing logical calculations on the program in the single-chip microcomputer; The communication module sends the output data of the data processing module to the digital cloud; The receiving device receives real-time monitoring data from the digital cloud to realize real-time remote monitoring of the decomposition of transformer insulating gas.

2. The remote monitoring system for SF6 decomposition in a transformer according to claim 1, characterized in that: The detection module, signal conversion module, data processing module and communication module are all installed at the transformer end and are powered uniformly after integration.

3. The remote monitoring system for SF6 decomposition in a transformer according to claim 1, characterized in that: The digital cloud is a remote data receiving and storage terminal, and the receiving device is a user terminal.

4. The remote monitoring system for SF6 decomposition in a transformer according to claim 1, characterized in that: The receiving devices are smart phones and personal computers.

5. The remote monitoring system for SF6 decomposition in a transformer according to claim 1, characterized in that: The communication module is a GPRS signal sending module, and the digital cloud is composed of a GPRS signal receiving module and a cloud server or a self-built server.

6. The remote monitoring system for SF6 decomposition in a transformer according to claim 1, characterized in that: The detection module, signal conversion module, data processing module and communication module are electrically connected by modules. The communication module transmits data with the digital cloud. The digital cloud and the receiving device transmit data with broadband mobile communication.

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