KR102131576B1 - Portable Partial Discharge Monitoring System - Google Patents

Abstract

The present invention relates to a portable partial discharge monitoring system. A sync transmission-reception module is added so that a synchronization signal can be exchanged through a network, and thus partial discharge can be monitored even in a place where no synchronization signal is provided. As a result, the system can be portably used. Heat dissipation on a main board unit as a whole can be performed and a housing can be kept sealed inside. A surge voltage flowing into the housing is not directly transmitted to the main board unit. No moisture is transmitted to the main board unit mounted in the housing and thus the main board unit is not deteriorated by moisture. The system includes: a sync detection unit connected to a sync source in order to detect a synchronization signal from the sync source; a sync broadcasting unit modulating the synchronization signal input from the sync detection unit into a packet signal and transmitting the signal through a network; a packet sniffer unit monitoring and detecting the packet signal transmitted through the network; a sync generation unit restoring the synchronization signal from the packet signal input from the packet sniffer unit and outputting the restored signal; and a partial discharge monitoring unit detecting partial discharge of a high-power cable in accordance with the synchronization signal input from the sync generation unit.

Description

Portable Partial Discharge Monitoring System

The present invention relates to a portable partial discharge monitoring device, and more specifically, by adding a sync transmission/reception module that allows a synchronization signal to be given to or received from each other through a network, so that partial discharge can be monitored even when a synchronization signal is not provided. It can be used as a portable device, while the inside of the enclosure can be kept sealed, and heat can be radiated to the entire main board, and surge voltage flowing into the enclosure is not directly transmitted to the main board, and inside the enclosure. The present invention relates to a portable partial discharge monitoring device that prevents moisture from being transmitted to a mounted mainboard portion so that the mainboard portion is not deteriorated by moisture.

When a partial defect such as voids, plastic trees, cracks due to manufacturing defects, mechanical stress, insulation aging, and process defects occurs in the insulator of a high-power cable, partial discharge at the defect site ( Partial Discharge (PD) occurs to cause insulation breakdown.

The partial discharge (PD) is represented by a pulse having a duration of approximately several nanoseconds, which is made of a frequency range of 1 MHz to 50 MHz, and in order to diagnose such a partial discharge (PD), a partial discharge monitoring system, PDMS) is used.

For reference, the characteristics of the basic spectral components of the spectrum are determined with respect to the power spectrum of noise on the power line, and the state of the power line is determined based on these characteristics to determine the power of medium and high voltage cables and insulators in an environment with electrical noise. A technique for automated monitoring has been disclosed in Korean Patent Application Publication No. 10-2009-0045154 (published on May 07, 2009) in "Detection and Monitoring of Partial Discharge of Power Lines".

However, the conventional portable partial discharge monitoring apparatus including the above-mentioned published patent application publication no. 10-2009-0045154 is intended to be applied to equipment for fixed installation, and is not suitable as a portable device.

Publication Patent Publication No. 10-2009-0045154

An object of the present invention is to solve the conventional problems as described above, by adding a sync transmission/reception module that can give or receive a synchronization signal to each other through a network, it is possible to monitor the partial discharge even where the synchronization signal is not provided. It is to provide a portable partial discharge monitoring device that can be used as a portable by making it possible.

Another object of the present invention, while allowing the inside of the enclosure to maintain a closed state, while allowing heat dissipation to the entire main board portion, portable partial discharge monitoring to prevent the surge voltage flowing into the enclosure is not directly transmitted to the main board portion In providing the device.

Another object of the present invention is to provide a portable partial discharge monitoring device that prevents moisture from being transmitted to the mainboard portion mounted inside the enclosure so that the mainboard portion is not deteriorated by moisture.

The configuration of the present invention as a means for achieving the above object is connected to a sink source (Sync source) and the sync detection unit for detecting a synchronization signal generated from the sink source, and the synchronization signal input from the above sink detection unit A sync broadcasting unit that modulates a packet signal and transmits it through a network, a packet sniffer unit that monitors and detects a packet signal transmitted through the network, and restores and outputs a synchronization signal from the packet signal input from the packet sniffer unit. It is preferable to include a sink generator and a partial discharge monitoring unit that detects a partial discharge of a high-power cable in accordance with a synchronization signal inputted from the sink generator.

The configuration of the present invention, among the portable partial discharge monitoring devices connected to the network, the portable partial discharge monitoring device connected to the sink source responds to the request signal for synchronization signal, and monitors the portable partial discharge located at the work site through the network. It is desirable to send a synchronization signal to the device.

In the configuration of the present invention, the partial discharge monitoring unit includes a board receptor mounted inside and sealed inside, an insulating oil filled inside the board receptor, and a housing unit for separating the board receptor from the outside. And, the cover portion is installed to be opened and closed on the front of the housing portion, the heat sink is formed with an insulating oil receiving space for convecting the insulating oil of the board receptor, and the board by insulating the board between the above-described board receptor and the main board portion It is preferable to include a board insulator that prevents the surge voltage transmitted from the receptor from being transmitted to the main board.

The configuration of the present invention is preferably made to further include a silicone pad formed to cover the pressure adjusting hole formed on the upper portion of the board receptor, and a compression bracket to limit the expansion range of the silicone pad.

In the configuration of the present invention, the main board part is electrically connected to a sensor for partial discharge measurement, such as a CT sensor or a UHF sensor installed for each high power cable of R, S, T, and N, and receives a high frequency signal. A signal is generated when a signal processing board for converting a digital signal and an electrical signal connected to the signal processing board described above pattern a digital signal of a high frequency signal to generate a discharge pattern such as a corona discharge pattern or void discharge pattern. The central processing unit and the communication module board for transmitting the pattern information or the dangerous signal analyzed by the central processing unit to the partial discharge monitoring server via LAN or optical communication, the signal processing board and the central processing unit, and It is preferable to include a power supply board for supplying power to the communication module board and a surge board for buffering the surge voltage input to the power supply board or signal processing board.

According to the present invention, a partial discharge can be monitored even when a synchronization signal is not provided by adding a sync transmission/reception module that allows a synchronization signal to be given to or received from each other through a network, so that the inside of the enclosure is sealed. It is possible to maintain heat while maintaining heat dissipation to the entire main board, prevent surge voltage flowing into the enclosure from being directly transmitted to the main board, and prevent moisture from being transmitted to the main board mounted inside the enclosure. It has an effect that the board portion is not deteriorated by moisture.

1 is a block diagram showing an installation position of a portable partial discharge monitoring device according to an embodiment of the present invention.
2 is a block diagram of a portable partial discharge monitoring device according to an embodiment of the present invention.
3 is a front view of the partial discharge monitoring unit of the portable partial discharge monitoring device according to an embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG. 3.
5 is a cross-sectional view taken along line BB in FIG. 3.
6 is an enlarged view of part C of FIG. 7.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail that a person skilled in the art to which the present invention pertains can easily implement the present invention. Other objects, features, and operational advantages, including the objects, actions, and effects of this invention, will be more apparent from the description of the preferred embodiment.

For reference, the embodiments disclosed herein are merely selected and suggested the most preferred embodiments among the various possible examples to help those skilled in the art, and the technical spirit of the present invention is limited or limited only by the presented embodiments. Rather, various changes, additions, and modifications including equivalents or substitutes are possible without departing from the technical spirit of the present invention.

In addition, the term or word expression used in the specification and claims of the present application is defined on the basis of the principle that the inventor can appropriately define the concept of a term in order to best describe his or her invention. , It should not be interpreted as being limited to only ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present invention. As an example, the singular expression includes a plurality of expressions unless the context clearly indicates otherwise, and the expression regarding the direction is set based on the location expressed on the drawing for convenience of explanation, and is “connected” or “connected” The expression “includes” includes not only direct connection or connection, but also connection or connection through another element in the middle. In addition, the expression "~ unit" includes a unit realized using hardware, a unit realized using software, a unit realized using both hardware or software, etc., and one unit includes one or more hardware or software It may be realized using, or two or more units may be realized using one hardware or software.

1 is a block diagram showing the installation position of a portable partial discharge monitoring device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a portable partial discharge monitoring device according to an embodiment of the present invention.

1 and 2, the configuration of the portable partial discharge monitoring devices 30a and 30b according to an embodiment of the present invention is connected to the sink source 20 and is generated from the sink source 20 A sync detector 301 for detecting a sync signal, a sync broadcaster 302 for modulating the sync signal input from the sync detector 301 into a packet signal, and transmitting it through the network 40, and a network. A packet sniffer unit 303 that monitors and detects a packet signal transmitted through 40, and a sink generator 304 that restores and outputs a synchronization signal from the packet signal input from the packet sniffer unit 303 described above. , It comprises a partial discharge monitoring unit 305 for detecting the partial discharge of the high-power cable in accordance with the synchronization signal input from the sink generator 304.

3 is a front view of a partial discharge monitoring unit of a portable partial discharge monitoring apparatus according to an embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, FIG. 5 is a cross-sectional view taken along line BB in FIG. 3, and FIG. This is an enlarged view of part C of 7.

3 to 6, the configuration of the partial discharge monitoring unit 305 of the portable partial discharge monitoring apparatus according to an embodiment of the present invention, the main board unit 1 is mounted therein to be sealed The board receiving body 3, the insulating oil 4 filled inside the above-described board acceptor 3, the housing part 5 for separating the above-described board receiving body 3 from the outside, and the above-described housing part (5) A heat sink (7) is provided with a cover portion (6) that is installed to be openable and closed on the front side, an insulating oil receiving space for allowing insulating oil of the above-described board acceptor (3) to convect, and the above-described board acceptor (3). ) And the main board portion (1) by insulating the surge voltage transmitted from the board acceptor (3) to the main board portion (1) and the board insulator (8) and the above-described board acceptor (3) It comprises a silicone pad 10 formed to cover the pressure control hole 3a formed on the upper portion, and a compression bracket 11 for limiting the expansion range of the silicone pad 10 described above.

The main board 1 receives a discharge signal from a CT (Current Transformer) sensor or UHF (Ultra High Frequency) sensor installed on a high power cable, detects a partial discharge pattern signal of a high power cable, and analyzes the pattern signal When a partial discharge occurs, a dangerous signal including ID information of a high-power cable and type information of a discharge pattern is generated and transmitted to a partial discharge monitoring server (not shown).

The main board portion 1 is composed of a plurality of substrates (1a, 1b, 1c, 1d, 1e) is laminated by a substrate stacking bolt, is coupled to the inside of the board receiving body 3, such as insulating bolts. More specifically, the main board part 1 is electrically connected to a sensor for partial discharge measurement such as a CT sensor or a UHF sensor installed for each high-power cable of R, S, T, and N, and transmits a high-frequency signal. Discharge patterns such as corona discharge pattern or void discharge pattern by patterning the digital signal of the high-frequency signal by being electrically connected to the signal processing substrate 1a that receives the input and converts the digital signal and the signal processing substrate 1a described above When it occurs, the central operation processing board (1b) that generates a danger signal and the pattern information or danger signal analyzed by the central operation processing board (1b) as a partial discharge monitoring server (not shown) to LAN or optical communication A communication module substrate (1c) for transmission, a power supply substrate (1d) for supplying power to the above-described signal processing substrate (1a), the central processing processing substrate (1b) and the communication module substrate (1c), and the power It comprises a surge substrate (1e) for buffering the surge voltage input to the substrate (1d) or the signal processing substrate (1a).

The above partial discharge monitoring server (not shown) is installed in a management center that manages and controls the substation, and interlocks with the main board unit 1 over a network to receive a dangerous signal and, if a dangerous signal is received, an administrator An alarm on the occurrence of a dangerous signal is transmitted to the communication terminal of a manager such as PC or smartphone. In addition, the above partial discharge monitoring server (not shown) receives pattern information on the frequency and phase of the high voltage cable to the main board unit 1 and transmits the pattern information for each of the high voltage cables to the communication terminal of the administrator for monitoring. It can be done.

The above-described board acceptor 3 is formed in a box shape of a metal material, and accommodates the main board part 1, but is sealed so that the main board part 1 is not exposed to the outside. In addition, the above-described board acceptor 3 is filled with insulating oil 4 inside, while protecting the main board portion 1 from contamination by foreign substances such as worms, dust, and rainwater, while insulating oil 4 is outside It is sealed to prevent leakage. In addition, the above-described board acceptor 3 is provided with a connection terminal portion electrically connected to the main board portion 1 on the outside. The above-described connection terminal portion is composed of terminals such as an optical communication terminal portion, a LAN cable terminal portion, a power terminal portion, and a sensor contact terminal, and an optical communication terminal portion, a LAN cable terminal portion, a power terminal portion, and a sensor contact terminal on the outside of the board acceptor 3 are selectively configured. It is electrically connected to each connection cable to be connected to the field to perform a power supply function, a sensor signal transmission function, and a communication function. When the connection terminal portion is coupled to the board receiving body 3, the gap is sealed with a rubber packing or a sealing caulking agent so that the insulating oil 4 accommodated inside the board receiving body 3 is not exposed to the outside.

The above-described insulating oil 4 is accommodated in the board acceptor 3, and is composed of components such as vegetable insulating oil, mineral oil, alkyl benzene, polybutene, and silicone oil.

The above-described housing part 5 has a front opening area formed on a part of the front part and is configured in a box shape. On the inside of the above-mentioned housing part 5, the board receiving body 3 containing the insulating oil 4 is coupled to the inside by bolting or fitting. In addition, the housing portion 5 is formed with a rear opening area so that the heat sink 7 coupled with the board receiving body 3 is exposed on the rear surface, foreign matter such as rain or dust flows between the heat sink 7 and the rear opening area. In order not to be sealed, it is sealed by rubber packing.

The above-described cover portion 6 is coupled to be detachably attached to the front opening area of the enclosure portion 5 to isolate the enclosure portion 5 from the outside. The cover part 6 is in a state in which a rubber packing is formed between the cover part 6 and the housing part 5 to seal the front opening area of the housing part 5, the cover part 6 and the housing part By bolting (5), the front opening area of the housing portion 5 is sealed. The housing part 5 and the cover part 6 isolate the board housing 3 from the outside so that dust, insects, or rainwater do not flow into the connection terminals of the board housing 3 from the outside.

The heat sink 7 is formed by protruding a plurality of wings spaced apart from each other, and an insulating oil receiving space is formed to allow the insulating oil 4 to be convected toward the board receiving body 3. The heat sink 7 is coupled to the rear surface of the board receiving body 3, and may be integrally coupled to the board receiving body 3. That is, the above-described heat sink 7 may be formed integrally with the board receiving body 3 or bolted with the board receiving body 3, and a rubber packing or the like may be coupled between the bonding areas to maintain a closed state. The heat sink 7 is exposed in the rear direction of the housing part 5 in the middle of the outside of the housing part 5 and is generated from the main board part 1 by allowing the insulating oil 4 to flow in and transmitted through the insulating oil 4 Allow heat to conduct outside.

The above-described board insulator 8 is formed in a plate shape, and is formed of an insulating material such as paper fiber, fabric, silicone, and epoxy. The above-described board insulator (8) is formed with a hole through which a bolt can be inserted, and is disposed between the board housing (3) and the main board section (1) between the board housing (3) and the main board section (1). By isolating, the surge voltage transmitted from the board acceptor 3 is insulated so as not to be transmitted to the main board part 1. The above-described board insulator 8 may be combined by a board acceptor 3 and bonding, in this case, the main board part 1 may be coupled by a board acceptor 3 and a bolt coupling.

The above-described silicon pad 10 is formed in a plate shape of silicon material. In this case, the board receiving body 3 is formed with a pressure control hole 3a on the top, and the above-described silicon pad 10 is formed to cover the pressure control hole 3a. When the internal pressure of the board receptor 3 increases above a certain value, the silicon pad 10 expands in a certain area by the air pressure to be discharged through the input control hole 3a.

The pressure bracket 11 is formed of a metal or resin material, and is formed in a cover shape covering the pressure control hole 3a, but to form an expansion region therein so that a certain area of the pressure control hole 3a is not covered. do. In addition, the pressing bracket 11 may be bolted to the upper space of the board receiving body 3 in order to press the outer region of the silicon pad 10, in this case, the board receiving body 3 and the bolted region are packed It is formed so that a gap is not formed by caulking or caulking. As such, the pressure bracket 11 is pressed so that the silicon pad 10 is in close contact with the board receptor 3, in this case, the fall bracket is the silicon pad 10 near the region where the pressure control hole 3a is formed. Is formed so that the pressure is not pressed, but by limiting the space so that the silicon pad 10 does not expand more than a certain volume, the silicon pad 10 is prevented from falling off due to overexpansion.

By the above-described configuration, the operation of the portable partial discharge monitoring device according to an embodiment of the present invention is as follows.

The portable partial discharge monitoring device 30b located at the work site receives a discharge signal from a CT (Current Transformer) sensor or a UHF (Ultra High Frequency) sensor installed on a high power cable to detect a partial discharge pattern signal of the high power cable, By analyzing this pattern signal, when a partial discharge occurs, a dangerous signal including ID information of a high-power cable and type information of a discharge pattern is generated and transmitted to a partial discharge monitoring server (not shown). Is required.

There is no problem if the synchronization signal can be obtained at the work site, but if the synchronization signal cannot be obtained at the work site, the portable partial discharge monitoring device 30b transmits the synchronization signal request signal to the network 40.

At this time, among the portable partial discharge monitoring devices connected to the network 40, the portable partial discharge monitoring device 30a connected to the sink source 20 responds to the synchronization signal request signal to establish the network 40. Through this, a synchronization signal is transmitted to the portable partial discharge monitoring device 30b located at the work site. In this case, the portable partial discharge monitoring device 30a detects the synchronization signal generated from the sink source 20 using the sink detection unit 301, and uses the sink broadcasting unit 302 to detect the synchronization signal. It is modulated with a packet signal and transmitted through the network 40.

The portable partial discharge monitoring device 30b of the work site, which has transmitted the synchronization signal request signal to the network 40, monitors and detects the packet signal transmitted through the network 40 using the packet sniffer unit 303, The sync signal is recovered from the above-described packet signal using the sink generator 304 and transmitted to the partial discharge monitoring unit 305.

The partial discharge monitoring unit 305 continuously receives a discharge signal from a CT (Current Transformer) sensor or a UHF (Ultra High Frequency) sensor, and continuously performs monitoring to detect and analyze a partial discharge pattern signal of a high power cable. The signal processing substrate 1a for processing and the central processing substrate 1b for pattern analysis are continuously operated to generate continuous heat.

At this time, when the portable partial discharge monitoring device 30b is installed in a high temperature and high humidity area such as the tropics, the outdoor temperature rises to 50 degrees Celsius in the case of summer, and the air cooling method using a cooling fan is adopted as a common cooling means. If this is done, high temperature and high humidity air must be introduced into the main board part 1, thereby shortening the life of the equipment due to deterioration due to corrosion of the main board part 1 and, in addition, it is necessary to allow air to pass through. However, frequent breakdown occurs due to the inflow of dust.

For this reason, in the present invention, the main board part 1 of the partial discharge monitoring part 305 is kept sealed by the board receptor 3, so that high temperature and high humidity air, insects, or dust are not introduced, and thus high temperature The main board part 1 is shortened due to humid air, insects, or dust, or a cause of failure is fundamentally blocked.

In this case, the partial discharge monitoring unit 305 discharges the heat inside through the heat sink 7, but the enclosure 5 surrounding the board receiving body 3 on the outside is divided into stars to rise to 50 degrees Celsius in summer. While direct sunlight, which is a factor, is not directly transmitted to the board receptor 3, heat of each of the substrates constituting the main board part 1 is distributed through the insulating oil 4, and through the insulating oil 4 Since the heat dissipated is discharged through the heat sink 7 located on the rear surface of the housing part 5, the heat dissipation function is implemented so that the main board part 1 does not deteriorate even when the main board part 1 is sealed. It becomes possible.

In addition, since the board receiving body 3 is sealed in a state containing the insulating oil 4, when the insulating oil 4 rises to a high temperature, the board receiving body 3 is forced to expand due to an increase in internal pressure. When the internal pressure increases, the silicon pad 10 located on the upper portion of the board receiving body 3 expands to a predetermined volume, thereby preventing the board receiving body 3 from breaking due to overpressure.

And, the main board part 1 accommodated in the board receiving body 3 is coupled with the board receiving body 3 insulated, and is insulated by the insulating oil 4. Therefore, since the surge voltage flowing into the outside of the housing portion 5 by lightning, etc. is not transmitted directly through the main board portion 1, it is possible to improve the stability of the main board portion 1.

In addition, in the present invention, it is possible to install the ready-made main board unit 1 as it is so that the manufacturing cost of the product does not increase, but the inside of the enclosure maintains a closed state, and heat is radiated to the entire main board unit 1 Since the surge voltage flowing into the housing is prevented from being directly transmitted to the main board part 1, the life of the main board part 1 is prevented from being deteriorated due to the temperature of the air or the outside air.

In addition, in the present invention, since the main board portion 1 performs a heat dissipation function in a closed state by the board receiving body 3, moisture is not transferred to the main board portion 1 mounted inside the board receiving body 3 The main board part 1 is prevented from being deteriorated by moisture.

1: Main board part 3: Board receptor
4: insulating oil 5: housing
6: cover part 7: heat sink
8: Board insulator 10: Silicone pad
11: Compression bracket 20: Sink sauce
30a, 30b: portable partial discharge monitoring device 40: network

Claims (5)

It is connected to the sink source and the sink detection unit for detecting a synchronization signal generated from the sink source,
A sync broadcasting unit that modulates a synchronization signal input from the above-described sink detection unit into a packet signal and transmits it through a network.
A packet sniffer unit for monitoring and detecting packet signals transmitted through a network;
A sink generator for restoring and outputting a synchronization signal from the packet signal inputted from the packet sniffer unit.
And a partial discharge monitoring unit configured to detect partial discharge of a high-power cable in accordance with the synchronization signal input from the sink generator. According to claim 1,
Among the portable partial discharge monitoring devices connected to the network, the portable partial discharge monitoring device connected to the sink source transmits a synchronization signal to the portable partial discharge monitoring device located at the work site through the network in response to the synchronization signal request signal. Portable partial discharge monitoring device, characterized in that. According to claim 1,
The above-described partial discharge monitoring unit includes a main board unit mounted therein to be sealed,
An insulating oil filled inside the board receptor,
A housing portion for isolating the above-described board receptor from the outside,
And the cover portion is installed to be opened and closed in front of the housing portion,
A heat sink having an insulating oil accommodating space to convect the insulating oil of the above-described board receptor,
A portable partial discharge monitoring device comprising a board insulator that prevents the surge voltage transmitted from the board acceptor from being transmitted to the main board by insulating the board acceptor from the main board. According to claim 3,
And a silicon pad formed to cover the pressure control hole formed on the upper portion of the board receptor,
Portable partial discharge monitoring device, characterized in that further comprises a compression bracket for limiting the expansion range of the silicon pad. According to claim 3,
The main board portion described above,
A signal processing board that converts digital signals by receiving high-frequency signals that are electrically connected to sensors for partial discharge measurement, such as CT sensors or UHF sensors installed for each high-power cable of R, S, T, and N,
A central computational processing board that is electrically connected to the signal processing board to generate a dangerous signal when a discharge signal such as a corona discharge pattern or a void discharge pattern is generated by patterning a digital signal of a high frequency signal;
A communication module substrate for transmitting the pattern information or the danger signal analyzed by the central computation processing board to the partial discharge monitoring server through LAN or optical communication
A power supply board for supplying power to the signal processing board, the central processing board, and the communication module board,
A portable partial discharge monitoring device comprising a surge board for buffering the surge voltage input to the power supply board or the signal processing board.

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