KR200422405Y1 - Pulse detection device by partial discharge - Google Patents

Abstract

Disclosed are a pulse detection apparatus and method by partial discharge. The pulse detection apparatus according to the present invention can detect only pulses caused by partial discharge by removing pulsed noise that may be mistaken for a partial discharge state despite being generated outside the power device. Therefore, it is possible to lower the error of the partial discharge detection that can occur in the power device and to increase the reliability.

Power Equipment, Partial Discharge, Pulse, Corona Discharge

Description

Apparatus of detecting pulse by partial discharge

1 is a block diagram of a pulse detection apparatus according to the partial discharge according to the present invention, and

2 is a flowchart provided to explain the operation of the pulse detection apparatus according to the partial discharge according to the present invention.

The present invention relates to a pulse detection device for detecting a pulse due to a partial discharge that can occur in a power device, and more particularly, to the pulsed noise that can be mistaken for a partial discharge state, even though generated outside the power device The present invention relates to a pulse detection device by partial discharge, which has improved the reliability of partial discharge detection.

The presence of conductor foreign material in a power device or the presence of voids or cracks in a spacer causes partial discharge in the form of pulses before accidental power generation. When the partial discharge pulse is detected from the outside, it is possible to predict a problem inside the power equipment, to grasp the degree of the problem, to prevent the accident, and to set up a proper maintenance and maintenance plan.

UHF detection method is used to measure such partial discharge. This method detects the partial discharge pulses in the Ultra High Frequency (UHF) band (300MHz to 3000MHz) that receive relatively less external noise, and predicts the degree and cause of abnormalities in the power equipment. Known as

Since the partial discharge pulse has a rapid rising time of less than 1 ns, the frequency characteristics of the propagating partial discharge pulses appear over almost all frequency bands. Of these, electromagnetic waves below 500 MHz are difficult to distinguish from noise in substations, and electromagnetic waves above 2 GHz can only be measured by expensive measuring equipment. Therefore, it is generally necessary to verify the presence of partial discharge by measuring signals in the UHF band in the 500 to 1500 MHz band. Is common.

However, corona discharges generated in high voltage lines inside substations contain a fairly large signal even at low frequencies over hundreds of MHz. According to the UHF detection method, such pulsed noise can be mistaken as a partial discharge signal, which is a great obstacle to the partial discharge measurement.

It is an object of the present invention to provide a pulse detection device by partial discharge, which improves reliability of partial discharge detection by removing pulsed noise that may be mistaken for a partial discharge state despite being generated outside of a power device.

In order to achieve the above object, a pulse detection apparatus by partial discharge according to the present invention includes a first sensor for detecting a radio signal of a first frequency band generated from a predetermined power device, and installed outside of the power device. Detects a pulse having an amplitude equal to or greater than a predetermined reference value from a wireless signal received through at least one of a second sensor, a first sensor, and a second sensor, which detects a radio signal in one frequency band, and pulse information on the detected pulse. Based on the signal detection unit and the pulse information outputting a, when the pulse is detected through the first sensor of the first sensor and the second sensor, the control unit for determining the pulse caused by the partial discharge generated in the power device Include.

Here, the first frequency band is an Ultra High Frequency (UHF) band, and the pulse information may include amplitude and phase information of the pulse.

The signal detection unit included in the pulse detection apparatus according to the partial discharge of the present invention, the first filter unit for outputting a signal of the second frequency band from the radio signal detected by the first sensor, the output from the first filter unit A first pulse detector for detecting a pulse having an amplitude greater than or equal to the reference value in a signal, a second filter unit for outputting a signal of the second frequency band from a wireless signal detected by the second sensor, and an output from the second filter unit It may include a second pulse detector for detecting a pulse having an amplitude equal to or greater than the reference value in the signal.

Here, the second frequency band is preferably a band of approximately 500 MHz to approximately 1500 MHz.

The pulse detection apparatus according to the partial discharge of the present invention may further include a communication interface unit connected to a predetermined analysis device and outputting pulse information received from the control unit to the analysis device. In this case, the controller may output the pulse information of the pulse determined to be caused by the partial discharge generated in the power device to the communication interface unit.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a pulse detection apparatus according to the partial discharge according to the present invention.

The pulse detection apparatus 100 according to the partial discharge of the present invention may detect and display the partial discharge generated in the power device to the user. In the partial discharge detection process, the pulse detection apparatus 100 by partial discharge ensures reliability in partial discharge detection by removing pulsed noise generated outside the power device and mistaken for a partial discharge state.

Referring to FIG. 1, the pulse detection apparatus 100 by partial discharge includes a first sensor 101, a second sensor 111, a signal detector 110, a communication interface 130, a memory 150, and a controller. And 170.

The first sensor 101 and the second sensor 111 are ultra high frequency (UHF) sensors, and detect a radio signal in an ultra high frequency band that exists around the sensor. The first sensor 101 and the second sensor 111 correspond to an antenna having a bandpass characteristic of the UHF band.

The first sensor 101 is installed in a power device (not shown). The power device here includes various devices related to power generation, and serves as an object for the pulse detection device 100 by the partial discharge of the present invention to detect the partial discharge. For example, for indoor and outdoor power plants and substations, GIS (Gas Insulated Switchgear), which is a device that securely opens and closes a line in an abnormal state such as an accident or short circuit as well as opening and closing in a normal state, is a power device. It may correspond to.

The second sensor 111 is a sensor for detecting impulse noise outside of a power device (not shown) for detecting partial discharge. It may be mainly installed inside a substation or the like, and is preferably spaced apart from a power device (not shown) to the extent that a pulse by partial discharge cannot be detected. External impulse noise may be generated by corona discharge or the like.

The signal detector 110 detects a pulse having an amplitude equal to or greater than a predetermined reference value from the wireless signals received through the first sensor 101 and the second sensor 111, and outputs the pulse to the controller 170.

The signal detector 110 includes a first filter unit 103, a first pulse detector 105, a second filter 113, and a second pulse detector 115.

The first filter unit 103 and the second filter unit 113 may include a band pass filter (BPF) and a broadcast signal and a radio for filtering a signal in a band of about 500 MHz to about 1500 MHz, which is a frequency band of the partial discharge signal. Includes a band elimination filter (BEF) for removing telephone signals.

The first filter unit 103 filters the signal input from the first sensor 101 and outputs the filtered signal to the first pulse detector 105, and the second filter unit 113 receives the signal input from the second sensor 111. Is filtered and output to the second pulse detector 115.

Each of the first pulse detector 105 and the second pulse detector 115 includes an analog-to-digital converter (ADC), and reads an amplitude and a phase of a pulse whose amplitude is equal to or greater than a predetermined reference value among input signals. The pulse information including the amplitude and phase information of the corresponding pulse is output to the controller 170. The first pulse detector 105 detects a pulse from an input signal of the first filter unit 103, and the second pulse detector 115 detects a pulse from a signal input from the second filter unit 113. .

The pulses detected by the first pulse detector 105 and the second pulse detector 115 may include partial discharge and external noise.

The communication interface unit 130 communicates with an external analysis device (not shown) by a predetermined protocol. The communication interface unit 130 outputs the amplitude and phase information of the pulses by the partial discharge output from the control unit 170 to the analyzer (not shown).

Here, the analysis device (not shown) is a user by analyzing the partial discharge state of the power device (not shown) based on information input from various devices including the pulse detection device 100 by the partial discharge of the present invention Will be displayed to.

The memory 150 includes various active and inactive memories, and various control programs or data of the pulse detection apparatus 100 by partial discharge may be stored.

The controller 170 controls the overall operation of the pulse detection apparatus 100 by the partial discharge, and controls the phase information and amplitude included in the pulse information input from the first pulse detector 105 and the second pulse detector 115. On the basis, only the pulse information by the substantial partial discharge is output to the analysis device (not shown) through the communication interface 130.

The controller 170 determines whether pulse information is input from the first pulse detector 105 and the second pulse detector 115. When pulse information is simultaneously input from the first pulse detector 105 and the second pulse detector 115, it means that the pulse information detected by the first pulse detector 105 is not caused by partial discharge. If there is a pulse due to the partial discharge, the pulse information will be input from the first pulse detector 105 and the pulse information will not be input from the second pulse detector 115.

Therefore, when pulse information is input only in the first pulse detector 105, the controller 170 outputs the pulse information to the communication interface 130 to be transmitted to an analysis device (not shown).

2 is a flowchart provided to explain the operation of the pulse detection apparatus according to the partial discharge according to the present invention. 1 and 2, the operation of the pulse detection apparatus 100 by the partial discharge of the present invention will be described.

The first sensor 101 and the second sensor 111 respectively receive the radio signals around and output them to the first filter unit 103 and the second filter unit 113, respectively (S201).

The first filter unit 103 and the second filter unit 113 extract signals of approximately 500 MHz to approximately 1500 MHz bands from radio signals received from the first sensor 101 and the second sensor 111, and further, broadcast signals. And a radio telephone signal is removed and outputted to the first pulse detector 105 and the second pulse detector 115.

The first pulse detector 105 and the second pulse detector 115 detect a pulse having an amplitude equal to or greater than a predetermined reference value from the signals received from the first filter unit 103 and the second filter unit 113, and detect the pulse. The pulse information is obtained and output to the control unit 170 (S203).

The controller 170 simultaneously detects the detected pulses in the first pulse detector 105 and the second pulse detector 115 based on the pulse information received from the first pulse detector 105 and the second pulse detector 115. It is determined whether it is detected (S205).

As a result of the determination in step S205, if the corresponding pulse is simultaneously detected by the first pulse detector 105 and the second pulse detector 115, the controller 170 determines that the pulse is caused by external noise and ignores it (S207). ).

As a result of the determination in step S205, if the corresponding pulse is not detected by the first pulse detector 105 and the second pulse detector 115 simultaneously, the controller 170 determines whether the pulse is detected by the first pulse detector 105. It is determined (S209).

As a result of the determination in step S209, the control unit 170 determines that the pulse is detected by the first pulse detection unit 105 as being caused by partial discharge, and transmits the pulse information received from the first pulse detection unit 105 to the communication interface. Control to transmit to the analysis device (not shown) through the unit 130 (S211).

If it is determined in step S209 that the pulse is not detected by the first pulse detector 105, it is determined to be caused by external noise, and the corresponding pulse is ignored.

By the above method, the pulse detection apparatus 100 by the partial discharge of this invention operates. Referring to FIG. 2, the process is determined as a pulse due to partial discharge only when a pulse is detected through the first sensor 101.

The present invention can be implemented in devices and systems. In addition, when the present invention is implemented in computer software, the components of the present invention may be replaced with code segments necessary for performing necessary operations. The program or code segment may be stored on a medium that can be processed by a microprocessor and transmitted as computer data coupled with carrier waves via a transmission medium or communication network.

Media that can be processed by a microprocessor include those capable of transmitting and storing information such as electronic circuits, semiconductor memory devices, ROMs, flash memories, EEPROMs, floppy disks, optical disks, hard disks, optical fibers, wireless networks, and the like. Include. Computer data also includes data that can be transmitted over electrical network channels, optical fibers, electromagnetic fields, wireless networks, and the like.

In addition, while the above has been illustrated and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the specific embodiments described above, the technical field to which the subject innovation belongs without departing from the spirit of the subject innovation claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described above, the pulse detection device by the partial discharge of the present invention can detect the pulse generated by the partial discharge generated in the power equipment.

Furthermore, the pulse detection apparatus according to the partial discharge of the present invention can block the misinterpretation of the pulse due to the partial discharge by the noise by removing various pulsed noises generated in the surroundings.

Accordingly, the error of the pulse detection device due to the partial discharge can be lowered and the reliability can be increased.

In addition, the pulse detection device according to the partial discharge of the present invention can be connected to an external analysis device can provide the data for detecting the occurrence of the partial discharge. In this process, by detecting and providing only pulses generated by the partial discharge, it is possible to maximize the reliability of the information finally provided to the user by analyzing the partial discharge.

Claims (6)

A first sensor installed in a predetermined power device and detecting a radio signal of a first frequency band generated from the power device; A second sensor installed outside the power device and detecting a wireless signal of the first frequency band generated outside the power device; A signal detector which receives a radio signal from the first sensor and the second sensor, detects a pulse having an amplitude equal to or greater than a predetermined reference value from the received radio signal, and outputs pulse information on the detected pulse; And A controller for determining that the pulse is caused by a partial discharge generated in the power device when the pulse is detected through the first sensor among the first sensor and the second sensor as a result of the determination based on the pulse information output from the signal detector; Pulse detection device by partial discharge comprising a. The method of claim 1, The first frequency band is a pulse detection device according to the partial discharge, characterized in that the Ultra High Frequency (UHF: Ultra High Frequency) band. The method of claim 1, And the pulse information includes amplitude and phase information of the pulse. The method of claim 1, The signal detection unit, A first filter unit outputting a signal of a second frequency band from the wireless signal detected by the first sensor; A first pulse detector detecting a pulse having an amplitude equal to or greater than the reference value from the signal output from the first filter unit; A second filter unit outputting a signal of the second frequency band from the wireless signal detected by the second sensor; And And a second pulse detector configured to detect a pulse having an amplitude equal to or greater than the reference value from the signal output from the second filter unit. The method of claim 4, wherein And said second frequency band is a band in a range of approximately 500 MHz to approximately 1500 MHz. The method of claim 1, And a communication interface unit connected to a predetermined analysis device and outputting pulse information received from the control unit to the analysis device. And the control unit outputs the pulse information of the pulse determined to be caused by the partial discharge generated in the power device to the communication interface unit.

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