KR102027829B1 - Apparatus for detecting gas in gas insulated transformer and control method thereof - Google Patents

Abstract

According to the present invention, disclosed are a gas detection device of a gas insulated transformer and a control method thereof. The gas detection device of the gas insulated transformer of the present invention comprises: a detection data collection part for detecting a decomposition gas of a sulfur hexafluoride from a gas insulated transformer; a detection server for analyzing and storing the decomposition gas data collected in the detection data collection part; and a data DB for storing an analysis determination result of the decomposition gas data and the decomposition gas data from the detection server. Therefore, the present invention removes noise interference caused by noise, disturbances, and background interference, thereby being capable of monitoring an abnormality of the gas insulated transformer by receiving data of excellent quality.

Description

Gas detection device for gas insulated transformer and its control method {APPARATUS FOR DETECTING GAS IN GAS INSULATED TRANSFORMER AND CONTROL METHOD THEREOF}

The present invention relates to a gas detection apparatus and control method thereof of a gas insulated transformer, and more particularly, to detect in real time the decomposition gas of sulfur hexafluoride (SF6) filled with an insulating gas in the gas insulated transformer to detect abnormality of the transformer. The present invention relates to a gas detection device for a gas insulated transformer and a control method thereof for monitoring.

In general, the water distribution system is provided with electrical equipment such as transformers, switch devices, and other safety devices for operation or control of power plants and substations, distribution of power, and operation of electric motors.

Gas Insulated Transformer (GITr) is a transformer that uses sulfur hexafluoride (SF6) gas, which is an incombustible gas, for insulation and cooling media. It is a transformer that eliminated the problem fundamentally.

Gas measuring method of transformer insulating oil that is used for diagnosis of abnormality of the large power transformer in operation is applied, for example, gas chromatography method, ET-IR method, gas sensor method, etc. In addition, the device is not suitable for the field installation type because of the complex and difficult maintenance, and the price is relatively high, so it is not widely used.

On the other hand, the photoacoustic gas measurement is a field of the infrared detector, since the gas has a unique absorption spectrum can be measured using a light absorption filter based on the gas to be measured using it, Even when the components are mixed, it is possible to detect a specific gas and to measure the gas concentration.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-1012463 (2011.01.26. Announcement, gas extraction device of transformer insulating oil).

In order to detect abnormality of gas insulated transformer like this, regular inspection is necessary, but as the measuring cycle is prolonged, it is difficult to prevent the pre-failure due to the progress of the breakdown, and only some gas is measured due to the insufficient equipment during the regular inspection. It is not enough to detect abnormal phenomenon in advance.

The present invention has been made to improve the above problems, an object of the present invention according to one aspect is to detect the decomposition gas of sulfur hexafluoride (SF6) filled with insulating gas in a gas insulated transformer in real time to detect the abnormality of the transformer It is to provide a gas detection device and control method of the gas insulated transformer to monitor the presence or absence.

Gas detection device for a gas insulated transformer according to an aspect of the present invention, the sensing data collection unit for detecting the decomposition gas of sulfur hexafluoride from the gas insulated transformer; Detection server for analyzing and determining the decomposition gas data collected by the detection data collection unit; And a data DB for storing the analysis determination result of the decomposition gas data and the decomposition gas data from the detection server.

In the present invention, the sensing data collection unit, gas detection unit for detecting the decomposition gas of sulfur hexafluoride from the gas insulated transformer; An amplifier for removing and amplifying noise from the decomposition gas data detected by the gas detector; And a data transmitter for transmitting the cracked gas data processed by the amplifier to the detection server.

Gas detection unit in the present invention, characterized in that for detecting the decomposition gas by the photoacoustic measurement method.

In the present invention, the amplifier includes a lock-in amplifier.

In the present invention, the data transmission unit, modbus. It characterized in that the decomposition gas data transmission in any one of TCP and serial methods.

The decomposition gas of sulfur hexafluoride in the present invention is characterized in that it comprises SO2F2, SO2, HF, CO, CO2 and H2O.

The invention further includes a communication unit for connecting the detection server to the network for remote monitoring.

In the present invention, the communication unit is characterized by using the IEC 61850 standard.

According to an aspect of the present invention, there is provided a control method of a gas detection apparatus for a gas insulated transformer, the detecting server receiving decomposition gas data of sulfur hexafluoride measured by a gas insulated transformer from a sensing data collection unit; Detecting and analyzing the input decomposition gas data by the detection server; And storing, by the detection server, the analysis result of the input decomposition gas data and the decomposition gas data in the data DB.

The decomposition gas of sulfur hexafluoride in the present invention is characterized in that it comprises SO2F2, SO2, HF, CO, CO2 and H2O.

In the present invention, the determining of the analysis may include determining the detection server by comparing the determination criteria of the set decomposition gas data with the input decomposition gas data.

In the present invention, the detection server further comprises the step of providing the decomposition gas data through the communication unit in accordance with the remote monitoring request.

In the present invention, the communication unit is characterized by using the IEC 61850 standard.

Gas detection device and control method of the gas insulated transformer according to an aspect of the present invention detects the decomposition gas of sulfur hexafluoride (SF6) is filled with the insulating gas in the gas insulated transformer in a photoacoustic manner in real time precisely, Lock-in amplifier eliminates noise interference caused by noise, disturbances, background interference, etc., allowing you to monitor the gas isolation transformer for abnormality by receiving high quality data In addition to savings, it can reduce truce time, improve the reliability of power supply, and provide trend management of gas-insulated transformers based on the detected decomposition gas data.

1 is a block diagram showing a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention.
2 is an exemplary view showing an absorption spectrum of a gas measured by a photoacoustic measurement method in a gas detection device of a gas insulated transformer according to an embodiment of the present invention.
3 is a block diagram illustrating in detail an amplifying unit in a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention.
4 is a circuit diagram illustrating an input amplifier applied to an amplifying unit in a gas detection device of a gas insulated transformer according to an embodiment of the present invention.
5 is an exemplary screen showing a result of collecting decomposition gas data in a gas detection device of a gas insulated transformer according to an embodiment of the present invention.
6 is an exemplary screen illustrating a setting screen of a criterion for determining an abnormal symptom in a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention.
7 is a flowchart illustrating a control method of a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a gas detection apparatus and control method of the gas insulated transformer according to the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is a block diagram illustrating a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention, and FIG. 2 is measured by photoacoustic measurement in the gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention. 3 is an exemplary diagram illustrating an absorption spectrum of a gas, and FIG. 3 is a block diagram illustrating amplification unit in a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. FIG. 5 is a circuit diagram illustrating an input amplifier applied to an amplifying unit in a gas detection device of a gas insulated transformer according to an embodiment of the present invention. FIG. 5 is a result of collecting decomposition gas data in a gas detection device of a gas insulated transformer according to an embodiment of the present invention. 6 is an exemplary screen illustrating a determination criteria for determining an abnormal symptom in a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention. An exemplary screen showing a screen.

As shown in FIG. 1, a gas detection apparatus for a gas insulated transformer according to an exemplary embodiment of the present invention may include a communication unit 40 including a sensing data collector 10, a detection server 20, and a data DB 30. It may include.

The detection data collection unit 10 detects the decomposition gas of sulfur hexafluoride from the gas insulation transformer and transmits the detection server 20 in real time to analyze and monitor the abnormal state and trend of the gas insulation transformer.

Sulfur hexafluoride (SF6) is developed as a substitute for freon gas and is used worldwide in semiconductor production processes, gas breakers, fire extinguishers, high pressure switchgear, medium pressure switchgear, transformers, gas insulation line systems, or instrument transformers. The increasing number of artificial greenhouse gases is known to have a global warming effect of about 22,000 times higher than that of carbon dioxide.

Here, when an internal abnormality occurs in the gas insulated transformer, sulfur hexafluoride gas is decomposed into SF4 and F2 gas, and SF4 reacts with H20 to generate SOF2, and SOF2 is unstable to react with H20 to generate SO2 and HF gas. In addition, O2 gas and SF4 gas from the transformer insulating paper react to produce SO2F2 gas.

Therefore, the sensing data collection unit 10 may monitor the presence or absence of a gas insulated transformer by detecting decomposition gas of sulfur hexafluoride including SO 2 F 2, SO 2, HF, CO, CO 2, and H 2 O.

Here, the sensing data collection unit 10 may include a gas detection unit 100, an amplifier 200, and a data transmission unit 300.

The gas detector 100 may detect the decomposition gas of sulfur hexafluoride from the gas insulation transformer by photoacoustic measurement.

Optoacoustic measurement is a method for acoustically detecting dense waves due to intermittent thermal expansion caused by absorption of intermittent excitation light irradiated onto a sample. In general, spectroscopic attempts are made because the size of the optoacoustic signal is proportional to the intensity of incident light. There is an advantage that can be applied to samples having a very high or low absorption rate and a large scattering sample.

Therefore, the photoacoustic measurement method does not measure the change of the intensity of irradiated light itself like the way that a general spectrometer measures, but it measures only the amount of absorbed incident light. Even a small signal can be measured.

As described above, when the gas detection unit 100 measures the decomposition gas of sulfur hexafluoride through the photoacoustic measurement method, it is preferable to apply a filter according to the absorption spectrum of each gas as shown in FIG. Do.

2 is an exemplary view showing an absorption spectrum of SO 2 F 2 gas.

That is, in this embodiment, since the gas interference is more than 99.9% of sulfur hexafluoride gas, it is preferable to measure and eliminate the effect of accurate interference.

The amplifier 200 may amplify the noise by removing noise from the decomposition gas data detected by the gas detector 100.

Here, the amplifier 200 applies a lock-in amplifier as shown in FIG. 3 to reference an unwanted measurement signal due to noise, disturbances, background interference, or the like. Separating through the signal can increase signal to noise.

In this case, the amplification unit 200 may perform signal processing at a DC level by using a chopper, which is a system that blocks light so as to maximize the accuracy of measurement by noise.

As illustrated in FIG. 3, the amplifier 200 may include an input amplifier 210, a bandpass filter 220, a mixer 230, a phase shifter 240, and a lowpass filter 250.

The input amplifier 210 may apply a low noise amplifier to receive and amplify the sensed signal detected from the gas detector 100.

For example, as illustrated in FIG. 4, the input amplifier 210 may include a first to second operational amplifiers 212 and 214 in two stages to implement a low noise amplifier (LNA).

Input resistors R1 and R3 may be connected to the negative terminals (−) of the first to second operational amplifiers 212 and 214, respectively, and a common mode voltage VCM may be applied to the positive terminals (+). have. In addition, capacitors C1 and C2 and feedback resistors R2 and R4 may be connected in parallel to the feedback paths of the first to second operational amplifiers 212 and 214, respectively. The feedback resistor R4 may be implemented as a variable resistor, and the gain of the input amplifier 210 may be adjusted by adjusting the resistance value of the variable resistor R4.

In the present exemplary embodiment, the input amplifier 210 is illustrated as two stages of the first to second operational amplifiers 212 and 214. However, the configuration and the number of stages of the input amplifier 210 may be changed in various ways. Can be.

The band pass filter (BPF) 220 increases the amount of noise when amplifying a small signal of a detection signal, so that only a specific frequency component for detection is filtered to filter the noise. Used to be detectable.

The phase shifter 240 shifts the phase of the reference signal to match the phase of the detection signal to separate the detection signal from the lock-in amplifier, thereby causing an offset caused by the difference in characteristics and coupling between the detection signal and the reference signal. The value can be reduced.

The mixer 230 multiplies the sensed signal passed through the bandpass filter 220 with a reference signal in phase with the sensed signal.

When multiplying the sinusoidal detection signal having the same phase by the reference signal, the DC component and the sinusoidal wave of 2f sum are obtained.

The low pass filter 250 outputs only a DC component, which is a low frequency component, from the signal multiplied by the mixer 230.

The data transmitter 300 transmits the cracked gas data processed by the amplifier 200 to the detection server 20.

Here, the data transmission unit 300 is modbus. The cracked gas data can be transmitted in either TCP or serial mode.

The detection server 20 analyzes and analyzes the decomposition gas data collected from the detection data collection unit 10.

The data DB 30 stores the decomposition gas data and the analysis result collected by the detection server 20.

Accordingly, as shown in FIG. 5, the detection server 20 not only displays the decomposition gas data collected in real time from the sensing data collection unit 10 but also analyzes the trend through the decomposition gas data stored in the data DB 30. It is possible to select and display the individual gas selectively.

In addition, as shown in FIG. 6, a determination criterion for determining a critical section and an abnormal section may be set and analyzed to analyze the collected decomposition gas data.

The communication unit 40 may monitor the decomposition gas data collected in real time by the detection server 20 remotely by connecting the detection server 20 to the network for remote monitoring, as well as stored in the data DB 30. Results and cracked gas data can be made available.

Here, the communication unit 40 may be applied to the substation comprehensive prevention diagnosis system using the IEC 61850 standard.

As described above, according to the gas detection device of the gas insulated transformer according to an embodiment of the present invention, the decomposition gas of sulfur hexafluoride (SF6) filled with the insulating gas in the gas insulated transformer in a photoacoustic manner in real time precisely By detecting the noise and removing noise interference caused by noise, disturbances and background interference through lock-in amplifier, it is possible to monitor the gas insulated transformer by receiving high quality data. In addition to reducing inspection costs and reducing interruption time, it is possible to increase the reliability of power supply and provide trend management of gas insulated transformers based on the detected decomposition gas data.

7 is a flowchart illustrating a control method of a gas detection apparatus of a gas insulated transformer according to an embodiment of the present invention.

In the control method of the gas detection device of the gas insulated transformer as shown in FIG. 7, first, the detection server 20 analyzes the decomposition gas data of sulfur hexafluoride (SF6) measured by the gas insulated transformer from the sensing data collection unit 10. To receive the input (S10).

Here, the decomposition gas of sulfur hexafluoride may include SO 2 F 2, SO 2, HF, CO, CO 2 and H 2 O.

Sulfur hexafluoride gas is decomposed into SF4, F2 gas, and SF4 reacts with H20 to produce SOF2 when the internal abnormality of gas insulated transformer occurs. SOF2 is unstable and reacts with H20 to produce SO2 and HF gas. In addition, O2 gas and SF4 gas from the transformer insulating paper react to produce SO2F2 gas.

Therefore, the sensing data collection unit 10 may monitor the presence or absence of a gas insulated transformer by detecting decomposition gas of sulfur hexafluoride including SO 2 F 2, SO 2, HF, CO, CO 2, and H 2 O.

After receiving the cracked gas data of sulfur hexafluoride from the sensing data collection unit 10 in step S10, the detection server 20 can analyze and determine the input cracked gas data (S20).

The detection server 20 not only displays the decomposition gas data collected in real time from the sensing data collection unit 10, but also compares the decomposition gas data collected by comparing with a set criterion for determining a critical section and an abnormal section for the decomposition gas. Analysis can be judged.

Thereafter, the detection server 20 stores the decomposition gas data collected in the step S10 and the result of the analysis and determination in the step S20 in the data DB 30 (S30).

As such, the decomposition gas data stored in the data DB 30 sets a period for each decomposition gas in the detection server 20 to analyze and manage the trend.

On the other hand, the detection server 20 may provide the decomposition gas data collected in real time, including the decomposition gas data and the determination result stored in the data DB 30 in step S30 according to the remote monitoring request through the communication unit 40 ( S40).

Here, the communication unit 40 may be applied to the substation comprehensive prevention diagnosis system using the IEC 61850 standard.

As described above, according to the control method of the gas detection device of the gas insulated transformer according to the embodiment of the present invention, the decomposition gas of sulfur hexafluoride (SF6) filled with the insulating gas in the gas insulated transformer through the photoacoustic method By detecting in real time and receiving high quality data through lock-in amplifier, it is possible to monitor the gas insulated transformer for abnormality, thereby reducing inspection cost and shortening interruption time, thus increasing the reliability of power supply. The trend management of the gas insulated transformer can be performed based on the detected decomposition gas data.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: detection data collection unit 20: detection server
30: data DB 40: communication unit
100: gas detection unit 200: amplification unit
210: input amplifier 220: band pass filter
230: mixer 240: phase shifter
250: low pass filter 300: data transmission unit

Claims (13)

Sensing data collection unit for detecting the decomposition gas of sulfur hexafluoride from the gas insulated transformer;
A detection server for analyzing and determining the decomposition gas data collected by the detection data collection unit; And
And a data DB for storing analysis determination results of the cracked gas data and the cracked gas data from the detection server.
The detection data collection unit, the gas detection unit for detecting the decomposition gas of sulfur hexafluoride from the gas insulation transformer; An amplifier for removing and amplifying noise from the cracked gas data detected by the gas detector; And a data transmitter for transmitting the cracked gas data processed by the amplifier to the detection server.
The amplifying unit, an input amplifier for receiving the sensed signal detected from the gas detector to amplify a low noise amplifier; A bandpass filter for passing only a specific frequency component in the sensed signal amplified by the input amplifier; A phase shifter for shifting a phase of a reference signal to match a phase of the detection signal; A mixer for mixing the sensed signal passing through the bandpass filter and the reference signal shifted in phase from the phase shifter; And a low-pass filter for passing only a DC component, which is a low frequency component, from the mixed signal in the mixer and outputting the low-pass filter.
The decomposition gas of sulfur hexafluoride, the gas detection device of a gas insulated transformer, characterized in that SO2F2, SO2, HF, CO, CO2 and H2O.
delete The gas detection device of a gas insulated transformer according to claim 1, wherein the gas detection unit detects the decomposition gas by photoacoustic measurement.
delete The method of claim 1, wherein the data transmission unit, modbus. Gas detection device of a gas insulated transformer, characterized in that for transmitting the decomposition gas data in any one of TCP and serial method.
delete The gas detection device of a gas insulated transformer according to claim 1, further comprising a communication unit for connecting the detection server to a network for remote monitoring.
The gas detection device of a gas insulated transformer according to claim 7, wherein the communication unit uses an IEC 61850 standard.
Receiving, by the detection server, decomposition gas data of sulfur hexafluoride measured by a gas insulated transformer from a detection data collection unit;
Analyzing and determining the cracked gas data inputted by the detection server; And
And storing, by the detection server, an analysis determination result of the input decomposition gas data and the decomposition gas data in a data DB.
In the analyzing and determining, the detection server compares the set criterion of the decomposition gas data with the input decomposition gas data to determine the result.
The decomposition gas of sulfur hexafluoride, SO2F2, SO2, HF, CO, CO2 and H2O characterized in that the control method of the gas detection device of a gas insulated transformer.
delete delete 10. The method of claim 9, wherein the detection server further comprises providing the cracked gas data through a communication unit according to a remote monitoring request.
The control method of a gas detection device of a gas insulated transformer according to claim 12, wherein the communication unit uses an IEC 61850 standard.

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