KR100662008B1 - Intelligent partial discharge sensor for gas insulated switchgear - Google Patents

Abstract

The present invention is a kind of partial discharge detection sensor for a gas insulated switchgear (GIS), built-in power supply unit, AC phase detector, signal processing unit, communication unit inside the sensor to provide a partial discharge signal from the sensor itself without a separate power supply from the outside of the sensor The present invention relates to an intelligent partial discharge detection sensor having a function of measuring, analyzing, and transmitting the same to a substation driver.

Description

Intelligent partial discharge sensor for gas insulated switchgear {Intelligent partial discharge sensor for gas insulated switchgear}

1 is a block diagram showing a configuration of the present invention,

2 is an exemplary diagram of a signal detected by a signal detector of a sensor;

3 is an exemplary diagram of a detection signal after passing a low pass filter;

4 is an exemplary diagram of a signal output from an AC power phase detector;

5 is an exemplary signal after roughing in a high pass active control filter;

6 is an exemplary diagram of a detection signal amplified by a signal amplifier;

7 is an exemplary diagram of a detection signal passing through an image detector;

8 is an exemplary diagram of a detection signal converted into a digital signal in a signal processing apparatus;

9 is a circuit diagram of a signal processing unit configuration.

Explanation of symbols on the main parts of the drawing

100: partial discharge detection sensor for intelligent gas insulated switchgear,

110: signal detection unit, 120: surge protection device,

130: low pass filter,

131: high pass active tuneable filter,

140: power supply unit, 150: AC power phase detection unit,

160: signal amplifier, 170: image detector,

180: digital signal processing unit, 181: digital signal converter,

182: Pattern Classifier,

183: buffer, 190: communication unit,

200: gas insulated switchgear, 210: center conductor of gas insulated switchgear,

220: enclosure of gas insulated switchgear,

300: central control room,

410: the partial discharge signal measured by the signal detector,

420: The signal detected by the signal detection unit by the applied voltage of the gas insulated switchgear.

The present invention relates to an intelligent partial discharge detection sensor for a gas insulated switchgear capable of detecting a partial discharge generated in a gas insulated switchgear (GIS) used in a substation and other power receiving facilities.

In general, GIS is widely used in dense water and substation equipment with high stability and small installation space, but it is not easy to inspect because it is sealed inside, and the damage range and ripple effect are great in case of failure. Therefore, there is a need for technologies that can detect abnormalities in the GIS and prevent failures in advance. Among them, the GIS is a technology that uses microwaves in the microwave band (300-3000 MHz) that are induced when discharging partial discharges generated by the precursor of GIS failure. It is a UHF partial discharge detection technique that detects the possibility of failure in advance by detecting it using a sensor installed in the system.

Conventional techniques for the microwave sensor for detecting partial discharge can be divided into the following two types.

The first technique is to attach a sensor that can detect the partial discharge signal in the microwave band inside the GIS or the spacer and transmit the measured signal from the sensor to the signal processing device located away from the sensor through the coaxial line without preprocessing. to be.

In this case, the structure of the sensor itself is relatively simple, but when the output signal of the sensor is transmitted in the coaxial line, the signal attenuation is large, and there is a spatial constraint that the signal processing device must be disposed around the sensor.

The second technology uses an amplifier and a frequency converter at the output of the microwave partial discharge sensor to remove the spatial constraints of the sensor and the signal processing device due to the coaxial signal attenuation. After converting to the frequency band and transmitting to a signal processing device installed relatively far from the sensor.

In this case, the restriction on the installation position of the signal processing device has been solved much compared to the first technology, but there is still a need for a separate signal processing device. There was a disadvantage.

Accordingly, the present invention has been invented to solve the conventional problems, it is equipped with an AC power phase detector and a signal processor that can analyze the discharge signal inside the sensor, and the GIS itself without receiving power from the outside to drive the GIS It can solve the limitation of distance between sensor and signal processing unit by receiving from the system, as well as the built-in communication unit in the sensor to convert the partial discharge information analyzed by the sensor into a digital signal and send it directly to the central control room or remote substation operator. It is an object of the present invention to provide an intelligent partial discharge detection sensor for an insulated switchgear.

The present invention integrates the power supply unit 140, the AC phase detector 150, the signal processing unit 180, the communication unit 190 in the microwave detection sensor 100 to analyze the partial discharge signal in the sensor itself without supplying power from the outside of the sensor The present invention relates to an intelligent microwave GIS partial discharge detection sensor that transmits the substation driver so that the substation driver can read the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

That is, the present invention is a detection sensor that can detect a partial discharge signal generated in the substation GIS, the power supply unit 140 for supplying power to the active element in the detection sensor 100;

An AC power phase detector 150 capable of detecting a phase of an AC voltage applied to the GIS;

A high pass active adjustable filter 131 for adjusting a measurement band of the partial discharge signal, a signal amplifier 160 for amplifying a discharge signal, and an image detector 170 for extracting an image signal;

A signal processor 180 capable of converting the partial discharge signal into a digital signal and processing the digital signal;

It consists of a communication unit 190 that can transmit the information measured and analyzed to the outside of the sensor.

1 is a basic configuration of an intelligent microwave partial discharge detection sensor, the sensor 110 of the sensor as shown in Figure 2 the microwave partial discharge signal 410 in the GIS and the power signal 420 derived from the GIS central conductor 210 as shown in FIG. After sensing and passing the surge protection device 120 to protect the signal processor from surges, it is input to the low pass filter 130 and the high pass active adjustable filter 131.

The low pass filter 130 removes the partial discharge signal 410 having a high frequency among the input signals and then supplies only the power signal 420 applied to the GIS as shown in FIG. 3 to the power supply 140 and the AC power phase detector 150. send. The power supply unit 140 smoothes the input GIS AC power signal, converts it into DC, and supplies power to various active elements inside the sensor. AC power phase detector 150 is 0 ° as shown in Figure 4 when the phase of the AC power is 0 ° Indicating location Generate a signal.

The high pass active adjustable filter 131 extracts only the partial discharge signal of a band having a relatively small external noise from the microwave signal input from the sensor detector 110 as shown in FIG. 5 and inputs it to the signal amplifier 160. do. The signal amplifier 160 amplifies the small discharge signal as shown in FIG. The amplified signal is transformed into a unipolar type video signal having a relatively low frequency as shown in FIG. 7 that can be processed by the signal processor 180 as shown in FIG. 7 while passing through the image detector 170. It is transmitted to the signal processor 180. In FIG. 9, the digital signal converter 181 of the signal processor 180 outputs the partial discharge video signal at an appropriate time interval based on a signal generated at 0 ° of the GIS AC voltage phase output from the AC power phase detector 150. Convert to a digital signal as shown.

At this time, if there is a signal higher than the threshold set by the digital signal converter 181 in advance, a pattern classifier composed of a technique such as a neural network, a fuzzy, etc. mounted in a microprocessor or a DSP in the signal processor 180 ( In 182, the GIS defect cause or the type of noise are inferred from the measured signal and stored in the buffer 183 together with the converted partial discharge video signal.

The communication unit 190 stores the stored discharge cause and the image signal based on the IEC61850 or the TCP / IP protocol, such as an optical fiber, a coaxial line, a twisted pair, a wireless LAN, a Bluetooth, a broadband communication, a mobile communication (CDMA, TDMA) to transmit to the substation central control room, remote monitoring room other than the substation, or personal portable terminal so that the substation operators can check and store the discharge signal detected by the sensor regardless of the place.

As described above, the present invention does not need to replace the battery or arrange the power line because the present invention directly receives power through the GIS from the sensor itself without supplying a battery or external power.                     

In addition, the signal processing unit is built into the sensor to eliminate the distance limit between the signal processing unit and the sensor, as well as process the measured signal directly from the sensor and transmit only the necessary information to the central control room and other places, thereby dramatically reducing the traffic volume of the communication line. Can be reduced.

In addition, the communication unit embedded in the sensor can directly send the information of the sensor to the personal portable terminal from a long distance, and in particular, when using the communication method of the communication unit as a wireless LAN, it is possible to remove any physical transmission lines at the rear of the sensor. There is no need for maintenance, and there is no fear of damaging the substation aesthetics by the complicated tracks.

In addition, the intelligent sensor of the present invention has a digital signal processing unit and a communication unit having a power supply function, so that the sensor itself can serve as a device when installed in the GIS of the digital substation.

Claims (4)

A detection sensor having an AC power phase detector for detecting a phase of an AC voltage applied to the GIS for detecting a partial discharge signal generated inside a substation GIS, A power supply unit 140 for supplying power of the active element in the detection sensor 100; A high pass active adjustable filter 131 for adjusting a measurement band of the partial discharge signal, a signal amplifier 160 for amplifying a discharge signal, and an image detector 170 capable of extracting an image signal; A signal processor 180 capable of converting the partial discharge signal into a digital signal and processing the digital signal; Intelligent partial discharge detection sensor for a gas insulated switchgear consisting of a communication unit 190 that can transmit the measured and analyzed information to the outside of the sensor. The gas insulated switchgear of claim 1, wherein the power supply unit 140 supplies driving power to the active element in the sensor using power induced from an AC voltage applied to the GIS without supplying power to the battery or the outside of the sensor. Intelligent partial discharge detection sensor. 2. The gas insulated switchgear according to claim 1, wherein a pattern classifier 182 is built in the signal processing unit 180 so that the sensor is equipped with a function of inferring the cause of the GIS defect or the kind of noise from the partial discharge signal. Intelligent partial discharge detection sensor According to claim 1, wherein the communication unit 190 is a digital communication method, such as IEC61850 or TCP / IP protocol, and discharge information and discharge signal measured and inferred by the optical fiber, coaxial line, double twisted line, wireless LAN, Bluetooth, broadband Intelligent partial discharge detection sensor for gas insulated switchgear, characterized in that it can be transmitted to a substation central control room, a remote monitoring room outside the substation, or a personal portable terminal by communication, mobile communication (CDMA, TDMA) or other methods.

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