JP2008175699A - Salt damage detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a salt damage detector capable of previously, accurately detecting discharge of a facility of an actually used outdoor distribution line to be monitored. <P>SOLUTION: A pair of discharge electrodes 4A having an acute-angled pointed section 4a are disposed in an actually used insulator 1. Thus, an appropriate gap between the pointed sections 4a used as discharge parts can be easily set according to the environment of a field, and the partial discharge characteristic can be adjusted according to a dirt state of the insulator 1 surface. Accordingly, the actually used insulator 1 can be used as a sensor for salt damage prediction and monitoring, and the situation that the actually used insulator 1 of a real machine without using a simulation insulator or the like generates discharge by the salt damage can be detected previously and accurately. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a salt damage detection device that detects in advance the occurrence of partial discharge caused by salt damage on power distribution equipment such as a support insulator that supports an outdoor distribution line.

  Conventionally, insulators have been widely used as electrical insulating members for high-voltage distribution lines. In areas close to the coast, sea salt components are carried by the wind from the sea, and salt is attached to the insulator surface.If moisture is supplied to the salt due to rain, condensation, etc., the surface resistance value of the insulator decreases rapidly. If the flashover voltage on the insulator surface is significantly reduced, a surface leakage current flows and a discharge occurs, eventually causing a surface flash and a power failure. This local discharge is accompanied by an intense light emission event (discharge light emission) and may cause deterioration of power distribution equipment and eventually damage such as ignition, resulting in a public disaster.

  In order to prevent discharge luminescence and public disasters caused by such salt damage in advance, measures such as periodically cleaning the insulator have been taken. Moreover, as what always monitors the contamination state of an insulator, there exists what monitors a contamination state by detecting the leakage current which flows into an insulator (for example, refer patent document 1).

In addition, there is a type in which a simulated insulator that is more easily contaminated than the monitored insulator is installed in the same environment as the monitored insulator, and the state of contamination of the simulated insulator is monitored (for example, see Patent Document 2).
JP-A-6-153374 JP 10-31723 A

  However, according to conventional salt damage prediction and monitoring, the occurrence of salt damage varies depending on the region and topography, and the occurrence of salt damage varies due to weather fluctuations in the same region. I can't. Further, in the pollution monitoring using a simulated insulator or the like, there is a problem that the occurrence of salt damage cannot be detected with high accuracy because it does not necessarily match the condition of contamination of power distribution equipment such as an insulator that is actually used. In particular, in areas with strong salt damage, discharge due to salt damage may not be sufficiently prevented, and it has been difficult to report at night due to discharge luminescence from customers.

  Therefore, the objective of this invention is providing the salt damage detection apparatus which can detect the discharge in the facility of the outdoor distribution line of the monitoring object actually used accurately in advance.

  In order to achieve the above object, the present invention provides an insulator that is provided in the same environment as an outdoor distribution line facility that performs a preliminary prediction of discharge based on salt damage, and an outer peripheral surface of the insulator that is formed of a material excellent in electrical insulation. A salt damage detection apparatus comprising: a discharge electrode formed in an electrode shape that generates a discharge at a voltage lower than a discharge voltage of the insulator based on contamination due to the salt damage.

  ADVANTAGE OF THE INVENTION According to this invention, the discharge in the equipment of the outdoor distribution line of the monitoring object actually used can be detected accurately in advance.

(First embodiment)
1A and 1B show a salt damage detection apparatus according to a first embodiment of the present invention. FIG. 1A is a schematic configuration diagram of the salt damage detection apparatus, and FIG. 1B is a plan view showing a part of a discharge electrode.

  As shown in FIG. 1 (a), the salt damage detection apparatus 10 has an electric wire holding part 1A for holding a high-voltage distribution line at the top, an insulator 1 formed in a cylindrical shape with an insulating material such as porcelain, and a metal A bolt portion 2 having a flange portion 2A formed of a material and used for supporting and fixing to a support column, a nut 3 and a washer 3A mounted on the bolt portion 2, and an outer peripheral surface of the cylindrical insulator 1 are attached in an annular shape. Detected by the discharge electrode 4, the high-voltage power supply 6 connected to the discharge electrode 4 through the conducting wire 5, the current detection unit 7 for detecting the current based on the discharge in the discharge electrode 4 from the conducting wire 5, and the current detection unit 7 And a determination unit 8 configured to determine partial discharge based on the current. In the salt damage detection apparatus 10, a current transformer is used as the current detection unit 7.

The discharge electrode 4 is formed by forming a metal plate such as stainless steel having excellent corrosion resistance by pressing or the like, and has a longitudinal size that can be wound around the outer peripheral surface of the insulator 1. In the first embodiment, with respect to the insulator 1 that is actually used in the field where salt damage prediction / monitoring is actually performed, a pair of zigzags as a whole and having a pointed portion 4a as an acute protrusion A discharge electrode 4A is prepared, and the pair of discharge electrodes 4A are positioned on the outer peripheral surface of the insulator 1 so that the pointed portions 4a of the pair of discharge electrodes 4A face each other with a predetermined gap (interval). A pair of discharge electrodes 4A are wound in an annular shape and fixed by welding the end 4b shown in FIG. The tip of the pointed portion 4a is provided with a certain distance w _A from the adjacent pointed portion 4a. In the present embodiment, the thickness of the metal plate constituting the discharge electrode 4 is 1 to 2 mm, and the gap between the pointed portions 4a varies depending on the local environment or the like, but is provided to have an interval of 2 to 10 mm. It is desirable.

  The salt damage detection apparatus 10 applies a single phase 400V to the pair of discharge electrodes 4A from the high voltage power source 6 through the lead wire 5 when performing salt damage monitoring in a 6.6 kV distribution system. In a state where the insulator 1 is not fouled, no current flows between the pair of discharge electrodes 4A attached to the insulator 1, but salt is attached to the insulator 1 and fouled, and moisture is supplied to the salt due to rain, condensation, etc. As a result, the surface resistance value of the insulator sharply decreases, and a situation in which discharge is likely to occur between the pair of discharge electrodes 4A is formed. When the contamination progresses, partial discharge occurs between the pointed portions 4a of the pair of discharge electrodes 4A. Arise.

  The current based on the partial discharge is detected by the current detection unit 7 and output to the determination unit 8. The determination unit 8 determines that salt damage has occurred when a value equal to or greater than a preset current value is detected.

(Effects of the first embodiment)
According to the first embodiment described above, the pair of discharge electrodes 4A having the sharp pointed parts 4a are provided in the insulator 1 that is actually used as an actual machine, so the gaps between the pointed parts 4a that become discharge parts are provided. The appropriate gap can be easily set according to the local environment, and the partial discharge characteristics can be adjusted according to the contamination state of the insulator 1 surface. Therefore, the insulator 1 actually used can be used as a sensor for prediction and monitoring of salt damage, and the insulator 1 of the distribution equipment (actual machine) actually used without using the simulated insulator etc. is discharged due to salt damage. It is possible to accurately detect a situation that may cause

  Therefore, for example, for a plurality of insulators 1 that are actually used, a group in which gaps between the pointed portions 4a provided on the pair of discharge electrodes 4A are set in stages with different values is configured, and each group has a partial By monitoring the current based on the discharge, it can be applied not only to the preliminary prediction of the discharge due to salt damage, but also to a system for grasping the progress of contamination.

  As the structure of the discharge electrode 4, the first embodiment has described the discharge electrode 4 in which a metal plate is pressed into a zigzag shape. However, as long as the discharge site can be provided in accordance with the wind direction in which the contamination is carried. For example, a pair of discharge electrodes 4A having sharp comb-shaped or saw-tooth shaped protrusions are prepared, and the protrusions are arranged so as to have a predetermined gap. May be. This makes it possible to easily generate a discharge at the discharge electrode 4 without maintaining a special function of controlling the wet state of the insulator 1 surface.

  In the first embodiment, the configuration in which the discharge electrode 4 including the pair of discharge electrodes 4A is provided on the surface of the insulator 1 has been described. However, if at least two discharge electrodes 4A are provided, the gap between the pointed portions 4a is provided. Since discharge can be generated, the discharge electrode 4 including two or more discharge electrodes 4A may be configured. In this case, since the number of discharge sites increases, the detection sensitivity of partial discharge based on salt damage is improved.

  Further, in a region where the contamination is significant, the contamination may accumulate between the pair of discharge electrodes 4A. Therefore, the pair of discharge electrodes 4A and the insulator 1 are arranged with a certain gap without being in direct contact with each other. By applying this structure, it is possible to avoid a decrease in detection accuracy due to accumulation of contamination.

  In the first embodiment, a current transformer is used as the current detection unit 7. However, the current detection unit 7 is not limited to the current transformer, and may have another configuration capable of directly or indirectly detecting partial discharge. .

  In the first embodiment, the configuration in which the discharge electrode 4 is provided in the insulator 1 as an actual machine that is actually used in the field where salt damage prediction / monitoring is performed has been described. It is also possible to perform salt damage detection by providing a pilot insulator having the above-described discharge electrode 4 in the vicinity thereof. In this case, it is more preferable to use a pilot insulator having the same material structure as the insulator to be monitored.

(Second Embodiment)
FIG. 2 is a schematic configuration diagram showing a salt damage detection apparatus according to the second embodiment of the present invention. In the following description, parts having the same configuration and function as those of the first embodiment are denoted by the same reference numerals.

  This salt damage detection apparatus 10 is made of a metal plate such as stainless steel having excellent corrosion resistance instead of the discharge electrode 4A described in the first embodiment, and an electrode piece 40 having a pointed portion 4a at the tip portion; The difference is that the discharge electrode 4 is constituted by a pair of discharge electrodes 4B having a connecting portion 41 that connects electrode pieces 40 arranged in parallel with a certain interval. This is common in a configuration in which it is fixed to the outer peripheral surface of 1 in an annular shape.

  FIG. 3 shows a discharge electrode according to a second embodiment, (a) is a view showing the entire discharge electrode, (b) is a view showing a part of the discharge electrode as viewed from the A direction of (a), (C) is a figure which shows a part of discharge electrode seen from the B direction of (a).

As shown in FIG. 3A, the electrode piece 40 is fixed to the connecting portion 41 by welding in a state of being separated from the adjacent electrode piece 40 by a certain distance w, and one end in the long side direction is fixed. It has a pointed portion 4a processed into a pointed shape. Therefore, the tip of the pointed section 4a is also provided with a certain distance w _A.

  When the discharge electrode 4B is fixed to the outer peripheral surface of the insulator 1, as shown in FIG. 3B, the electrode piece 40 is in close contact with the outer peripheral surface of the insulator 1, and a gap is formed between the connecting portion 41 and the insulator 1. Since d is generated, the electrode pieces 40 are less likely to be contaminated, and even if the contamination occurs, the cleaning performance by rain or the like is improved. In addition, in FIG.3 (b), the part of the insulator 1 is shown in planar form for convenience of explanation.

  As shown in FIG. 3C, the electrode piece 40 is formed in a wedge shape whose thickness decreases toward the tip of the pointed portion 4a.

(Effect of the second embodiment)
According to the second embodiment described above, in addition to the preferable effects of the first embodiment, the discharge electrode fixed to the connecting portion 41 in a state where the electrode pieces 40 are separated by a certain distance w. By using 4, it can be set as the structure excellent in stain resistance and the washing | cleaning property of a pollutant.

(Third embodiment)
FIG. 4 is a schematic configuration diagram showing a salt damage detection apparatus according to the third embodiment of the present invention.

  In this salt damage detection device 10, instead of the discharge electrode 4B described in the second embodiment, an electrode piece 40 having a pointed portion 4a at the tip is fixed to the outside of the connecting portion 41, and the connecting portion 41 and the insulator are fixed. 1 is different in that the discharge electrode 4 is constituted by a pair of discharge electrodes 4C provided with an electrode support portion 42 between them, and is common in a configuration in which the discharge electrode 4 is annularly attached to the outer peripheral surface of the insulator 1. is doing.

  FIG. 5 shows a discharge electrode according to a third embodiment, (a) is a view showing the entire discharge electrode, (b) is a view showing a part of the discharge electrode as viewed from the A direction of (a), (C) is a figure which shows a part of discharge electrode seen from the B direction of (a).

As shown in FIG. 5A, the electrode piece 40 is fixed to the outside of the connecting portion 41 opposite to the insulator side by welding while being separated from the adjacent electrode piece 40 by a certain distance w. And has a pointed portion 4a obtained by processing one end in the long side direction into a pointed shape. Therefore, the tip of the pointed section 4a is also provided with a certain distance w _A.

  When the discharge electrode 4C is fixed to the outer peripheral surface of the insulator 1, as shown in FIG. 5B, the discharge electrode 4C is disposed by the electrode support portion 42 so as to have a gap d between the connecting portion 41 and the insulator 1. . The electrode support portion 42 is fixed to the connecting portion 41 by welding, and has a configuration integrated with the connecting portion 41 and the electrode piece 40. As shown in FIG. 5C, the electrode piece 40 is bent to the side of the insulator 1 at the bent portion 40B, whereby the pointed portion 4a is in contact with the outer peripheral surface of the insulator 1, so that the electrode piece 40 It has a structure in which it is difficult to cause fouling during cleaning, and the cleaning performance is good even if fouling occurs. In addition, also in FIG.5 (b), the part of the insulator 1 is shown in planar form for convenience of explanation.

  Also in the third embodiment, the electrode piece 40 is formed in a wedge shape whose thickness decreases toward the tip of the pointed portion 4a as shown in FIG. 5 (c).

(Effect of the third embodiment)
According to the third embodiment described above, in addition to the preferable effects of the second embodiment, it is possible to obtain a configuration in which the stain resistance and the cleaning property of the pollutant are further improved.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from or changing the technical idea of the present invention.

  For example, the salt damage detection apparatus described above is intended to monitor the insulator 1 that is actually used, but is not limited to the insulator, and can be applied to facilities for outdoor distribution lines such as electric wires.

  Further, the discharge electrode 4 is not limited to the one in which the pair of discharge electrodes 4A to 4C are annularly mounted on the outer peripheral surface of the insulator 1, and is dispersed on the outer peripheral surface so as not to cause blind spots due to the wind direction. It may be provided.

1A and 1B show a salt damage detection apparatus according to a first embodiment of the present invention. FIG. 1A is a schematic configuration diagram of the salt damage detection apparatus, and FIG. 1B is a plan view showing a part of a discharge electrode. FIG. 2 is a schematic configuration diagram showing a salt damage detection apparatus according to the second embodiment of the present invention. FIG. 3 shows a discharge electrode according to a second embodiment, (a) is a view showing the entire discharge electrode, (b) is a view showing a part of the discharge electrode as viewed from the A direction of (a), (C) is a figure which shows a part of discharge electrode seen from the B direction of (a). FIG. 4 is a schematic configuration diagram showing a salt damage detection apparatus according to the third embodiment of the present invention. FIG. 5 shows a discharge electrode according to a third embodiment, (a) is a view showing the entire discharge electrode, (b) is a view showing a part of the discharge electrode as viewed from the A direction of (a), (C) is a figure which shows a part of discharge electrode seen from the B direction of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... insulator 1A ... electric wire holding part, 2 ... bolt part, 2A ... collar part, 3 ... nut, 3A ... washer, 4 ... discharge electrode, 4A-4C ... discharge electrode, 4a ... pointed part, 4b ... end part DESCRIPTION OF SYMBOLS 5 ... Conductor, 6 ... High voltage power supply, 7 ... Current detection part, 8 ... Determination part, 10 ... Salt damage detection apparatus, 40 ... Electrode piece, 40B ... Bending part, 41 ... Connection part, 42 ... Electrode support part

Claims (4)

An insulator made of a material with excellent electrical insulation, installed in the same environment as the facilities of an outdoor distribution line that performs preliminary prediction of discharge based on salt damage,
A salt damage detection apparatus comprising: a discharge electrode provided on an outer peripheral surface of the insulator and formed in an electrode shape that generates a discharge at a voltage lower than a discharge voltage of the insulator based on the contamination due to the salt damage.   The discharge electrode has a longitudinal size that can be annularly wound around an outer peripheral surface of the insulator, and a plurality of sharp protrusions are arranged at a predetermined distance in the longitudinal direction. The salt damage detection apparatus according to claim 1.   The salt damage detection device according to claim 1, wherein the discharge electrode is fixed in an annular shape with a certain gap between the discharge electrode and an outer peripheral surface of the insulator.   The discharge electrode includes a pair of discharge electrodes that are annularly attached to the outer peripheral surface of the insulator, and the pair of discharge electrodes has a plurality of sharp protrusions, and the plurality of protrusions are spaced apart from each other. The salt damage detection device according to claim 1, wherein the salt damage detection device is fixed to an outer peripheral surface of the insulator so as to be opposed to each other.

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