CN110609126A - Hydrogen on-line monitoring system in transformer and internal fault judgment method of transformer - Google Patents

Abstract

The invention discloses an on-line hydrogen monitoring system in a transformer, which includes a hydrogen monitoring device and a monitoring terminal, the monitoring terminal includes monitoring software and a control unit, the hydrogen monitoring device is connected to the control unit, and the control unit includes a data acquisition module, data transmission module, data storage module, data processing module, display module and alarm module. The invention has the advantage of selectively monitoring the hydrogen concentration in the insulating oil, which can be intuitively compared with the laboratory analysis results, and can intuitively adopt the hydrogen attention value in the preventive test procedure of electric equipment through the setting of the alarm value, and issue an early warning in time Or alarm to judge the internal fault of the transformer, which can avoid the further upgrade of the transformer fault, and the abnormality will cause the power system failure.

Description

Hydrogen on-line monitoring system in transformer and internal fault judgment method of transformer

technical field

The invention relates to the technical detection field of transformers, in particular to an online monitoring system for hydrogen in a transformer and a method for judging internal faults of a transformer.

Background technique

During the operation of the transformer, due to overvoltage, lightning strikes, harmonics, and moisture, etc., partial discharge and overheating will occur inside the insulation, resulting in cracking or dehydrogenation of the internal transformer oil to generate hydrogen and other faulty gases. Gas online monitoring is used to judge the fault of the transformer, because the gas in the insulating oil is the first signal of a fault (overheating, discharge, aging) inside the transformer. The gas-in-oil online monitor can detect potential failures in time during operation and avoid sudden accidents. This monitoring method needs to monitor and analyze the content of all gases generated in the transformer, and the monitoring data is large and the process is complicated. With the development of transformer technology, the quality of transformers has improved significantly, and the monitoring technology has also continued to improve. Monitoring and early warning of the operating status of transformers before serious failures of transformers can prevent further fault upgrades of transformers in advance and avoid occurrence. Bigger loss.

Hydrogen is one of the main components in discharge faults. Selectively monitor the H2 concentration in insulating oil, which can be visually compared with the laboratory analysis results. Through the setting of the alarm value, it can be intuitively adopted in the preventive test procedures for power equipment. H2 attention value, timely warning or alarm, and timely comparison and analysis of the operating status of the transformer can avoid further escalation of transformer faults and abnormal power system failures. Therefore, it is urgent to develop an online monitoring system for hydrogen in transformers and A method for judging internal faults of transformers to solve the above problems.

Contents of the invention

The purpose of the present invention is to provide an online monitoring system for hydrogen in a transformer and a method for judging an internal fault in a transformer, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: an online monitoring system for hydrogen in a transformer, including a hydrogen monitoring device and a monitoring terminal, the monitoring terminal includes a control unit, the hydrogen monitoring device is connected to the control unit, The control unit includes a data acquisition module, a data transmission module, a data storage module, a data processing module, a display module and an alarm module;

The data acquisition module is used to be connected with the hydrogen monitoring module, and the collected data is transmitted to the data storage module for storage through the data transmission module, and is transmitted to the data processing module at the same time; the data storage module is used to store laboratory data and The real-time data transmitted by the acquisition module; the data processing module compares and analyzes the data transmitted by the data transmission module and the data of the data storage module, and displays the result on the display module; when the collected real-time data exceeds the hydrogen set value , the alarm module issues an early warning or an alarm according to the preset operating state of the transformer.

Further, the corresponding relationship between the set value of the hydrogen and the operating condition of the transformer is as follows:

When the hydrogen content is ≤150μL/L, the transformer works normally;

When 150μL/L<hydrogen content≤300μL/L, the transformer will give an abnormal warning;

When 300μL/L<hydrogen content, the transformer failure alarm.

Further, when the 150 μL/L<hydrogen content≤300 μL/L, it is necessary to manually observe the oil level, measure the temperature of the transformer through infrared, and judge the internal fault of the transformer according to the temperature of the transformer; when the content of 300 μL/L<hydrogen, stop the mutual induction Transformer work, measure the chromatogram of the transformer oil, and judge the specific fault type of the transformer.

Further, it is characterized in that the hydrogen gas monitoring device is a fuel cell gas sensor.

Further, the number of the hydrogen monitoring device is one or more.

The present invention also provides a method for judging the internal faults of the transformer, which uses the above-mentioned online hydrogen monitoring system in the transformer to monitor the hydrogen content in the transformer and judge the internal faults of the transformer.

The beneficial effects of the present invention are: the present invention selectively monitors the hydrogen concentration in the insulating oil, which can be visually compared with the laboratory analysis results, and the H2 attention in the preventive test procedure for electric equipment can be intuitively adopted through the setting of the alarm value. Value, timely early warning or alarm, to judge the internal fault of the transformer, can avoid the further upgrade of the fault of the transformer, and the power system failure caused by the abnormality.

Description of drawings

Figure 1 is a schematic diagram of the hydrogen on-line monitoring system of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, the present invention provides a kind of hydrogen on-line monitoring system in transformer, comprises hydrogen monitoring device and monitoring terminal, and described monitoring terminal comprises control unit, and described hydrogen monitoring device is connected with described control unit, and described control unit Including data acquisition module, data transmission module, data storage module, data processing module, display module and alarm module;

The data acquisition module is used to connect with the hydrogen monitoring module, and the collected data is transmitted to the data storage module through the data transmission module for storage, and at the same time transmitted to the data processing module; the data storage module is used to store the laboratory data and the real-time data transmitted by the acquisition module. Data; the data processing module compares and analyzes the data transmitted by the data transmission module and the data of the data storage module, and displays the result on the display module; when the collected real-time data exceeds the set value of hydrogen, the alarm module will It can send out early warning or alarm according to the operating status of the device.

The hydrogen monitoring device is a fuel cell gas sensor. In this embodiment, 3 monitoring devices are used to monitor 3 mutual inductors at the same time.

The method for judging an internal fault of a transformer includes the following steps:

When the hydrogen content is ≤150μL/L, the transformer works normally;

When 150μL/L<hydrogen content≤300μL/L, the transformer will give an abnormal warning;

When 300μL/L<hydrogen content, the transformer failure alarm.

When 150μL/L<hydrogen content≤300μL/L, it is necessary to manually observe the oil level, measure the temperature of the transformer through infrared, and judge the internal fault of the transformer according to the temperature of the transformer;

When 300μL/L<hydrogen content, stop the transformer, measure the transformer oil chromatogram, and judge the specific fault type of the transformer.

This monitoring system can simultaneously monitor multiple monitoring devices and gas information in transformer oil continuously online, remotely read and quickly store the operating parameters of the monitoring devices, and display and browse all monitoring records stored in the monitoring storage module.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (6)

1. A hydrogen on-line monitoring system in a transformer, characterized in that it comprises a hydrogen monitoring device and a monitoring terminal, the monitoring terminal includes a control unit, the hydrogen monitoring device is connected to the control unit, and the control unit includes a data Acquisition module, data transmission module, data storage module, data processing module, display module and alarm module; The data acquisition module is used to be connected with the hydrogen monitoring module, and the collected data is transmitted to the data storage module for storage through the data transmission module, and is transmitted to the data processing module at the same time; the data storage module is used to store laboratory data and The real-time data transmitted by the acquisition module; the data processing module compares and analyzes the data transmitted by the data transmission module and the data of the data storage module, and displays the result on the display module; when the collected real-time data exceeds the hydrogen set value , the alarm module issues an early warning or an alarm according to the preset operating state of the transformer. 2. The hydrogen online monitoring system in a transformer according to claim 1, wherein the corresponding relationship between the set value of the hydrogen and the operating status of the transformer is as follows: When the hydrogen content is ≤150μL/L, the transformer works normally; When 150μL/L<hydrogen content≤300μL/L, the transformer will give an abnormal warning; When 300μL/L<hydrogen content, the transformer failure alarm. 3. An online monitoring system for hydrogen in a transformer according to claim 2, characterized in that, when the hydrogen content of 150 μL/L<≤300 μL/L, the oil level needs to be manually observed, and the temperature of the transformer is measured by infrared. Judging the internal fault of the transformer according to the temperature of the transformer; when the hydrogen content is 300μL/L, stop the transformer, measure the chromatogram of the transformer oil, and judge the specific fault type of the transformer. 4. An on-line monitoring system for hydrogen in a transformer according to any one of claims 1-3, wherein the hydrogen monitoring device is a fuel cell gas sensor. 5. An online hydrogen monitoring system in a transformer according to claim 4, characterized in that the number of said hydrogen monitoring devices is one or more. 6. A method for judging an internal fault of a transformer, characterized in that the hydrogen content in the transformer is monitored and the internal fault of the transformer is judged by using the hydrogen online monitoring system in the transformer according to any one of claims 1-5 .