JP2014183189A - Partial discharge measuring device, stationary induction apparatus with the same and partial discharge measuring method - Google Patents

Abstract

The present invention provides a partial discharge measuring device that can be attached to a tank and that can detect electromagnetic waves accompanying partial discharge with high sensitivity while suppressing external noise, a static dielectric device including the same, and a partial discharge measuring method. .
A partial discharge measuring apparatus according to an embodiment includes a flange that can be attached to an opening provided on an upper surface of a static dielectric device tank in which an insulating medium is sealed, and an insulating material provided on one surface of the flange. A cylindrical protective tube, a temperature sensing part which is housed inside the protection tube and detects the temperature of the insulating medium, and is housed inside the protection tube and is electrically insulated from the temperature sensing part. In addition, a conductive member that detects electromagnetic waves caused by partial discharge, a temperature signal output terminal that is provided on the flange and outputs a temperature signal corresponding to the temperature detected by the temperature sensing portion, and the flange And an electromagnetic wave signal output terminal that outputs an electromagnetic wave signal of the electromagnetic wave detected by the conductive member.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a partial discharge measurement device, a static dielectric device including the partial discharge measurement device, and a partial discharge measurement method.

  Static dielectric devices such as transformers and reactors have a high-voltage conductor such as a winding built in the tank, and the high-voltage conductor is insulated from the tank and the outside by an insulating medium such as gas or oil.

  When an insulation failure occurs between the high-voltage conductor inside the static dielectric device and the insulation medium, a partial discharge may occur at this insulation failure portion. If the partial discharge is left unattended, a defective part of the insulation develops, causing a serious dielectric breakdown and possibly damaging the device.

  Examples of a partial discharge measurement method for detecting whether or not a partial discharge has occurred in a poorly insulated part of a device include an ERA method using a bushing test tap, a tuned partial discharge measuring device using a ground current, and a high frequency Examples include an earth current method using a current transformer (CT) and an acoustic method for measuring the internal sound of the tank. In these conventional partial discharge measurement methods, a measuring instrument having a frequency band of several tens of kHz to several hundreds of kHz is used.

  In such a frequency band, it also detects external noise signals such as current pulses generated when operating the power equipment installed in the vicinity, so whether the measured signal is a partial discharge inside the static dielectric equipment There was a problem that it was difficult to judge. In addition, it is necessary to stop applying a voltage to the static dielectric device during measurement.

  As a countermeasure for such a problem, the UHF method has been proposed. This UHF method can detect an electromagnetic wave in the UHF band (800 MHz to 3 GHz) by a UHF sensor.

  This UHF method has a merit that the frequency band of electromagnetic waves caused by partial discharge can be covered in a wide range, but the frequency of UHF band is used for mobile phones and the like, and in order to determine partial discharge with high sensitivity, external noise is used. Need to be removed.

  For that purpose, it is required to install the UHF sensor in an electromagnetically shielded space (shield room), and specifically, there is a method of inserting the UHF sensor from a drain valve.

JP 2010-73984 A

  However, the method of inserting the UHF sensor from the drain valve is cumbersome because it is necessary to stop applying power and take out the insulating medium from the tank and insert the UHF sensor into the tank each time measurement is performed. In addition, since the drain valve is originally provided for taking the insulating medium into and out of the tank, the UHF sensor may not be inserted into the tank depending on the shape of the drain valve.

  Therefore, in order to solve these problems, the embodiment of the present invention includes a partial discharge measuring device that can be attached to a tank, can suppress external noise, and can detect electromagnetic waves accompanying partial discharge with high sensitivity. A static dielectric device and a partial discharge measurement method are provided.

In order to achieve the above object, a partial discharge measuring apparatus according to an embodiment is provided with a flange that can be attached to an opening provided on an upper surface of a static dielectric equipment tank in which an insulating medium is sealed, and the static dielectric equipment. A cylindrical protective tube that is provided on one surface of the flange and is made of an insulating material, and at least a part of which can be placed in the insulating medium, is housed inside the protective tube, and the temperature of the insulating medium is adjusted. A temperature sensing part to be detected; and a conductive member that is housed inside the protective tube and electrically insulated from the temperature sensing part and detects electromagnetic waves caused by partial discharge; and the flange, A temperature signal output terminal that outputs a temperature signal corresponding to the temperature detected by the temperature sensing unit, and an electromagnetic wave that is provided on the flange and outputs an electromagnetic wave signal of the electromagnetic wave detected by the conductive member And a signal output terminal.

Sectional drawing which shows the structure of the static dielectric equipment which concerns on 1st Embodiment. The perspective view which shows the structure of the partial discharge measuring apparatus which concerns on 1st Embodiment. FIG. 3 is an AA arrow view of FIG. 2. The flowchart which shows the partial discharge measurement operation | movement of the partial discharge measuring apparatus which concerns on 1st Embodiment. The flowchart which shows the temperature measurement operation | movement of the partial discharge measuring apparatus which concerns on 1st Embodiment. The perspective view which shows the structure of the partial discharge measuring apparatus which concerns on 2nd Embodiment. The BB arrow line view of FIG. Sectional drawing which shows the structure of the static dielectric equipment which concerns on 3rd Embodiment. The top view which shows the structure of the static dielectric equipment which concerns on 4th Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a static dielectric apparatus according to the first embodiment, FIG. 2 is a perspective view showing a configuration of a partial discharge measuring apparatus according to the first embodiment, and FIG. It is an arrow view.

  As shown in FIG. 1, the static dielectric device includes a partial discharge measuring device 1, a tank 2, an iron core 3, and a winding 4.

  An insulating medium 5 such as oil or gas is enclosed in the tank 2, and the transformer contents including the iron core 3 and the winding 4 wound around the main leg of the iron core 3 are accommodated together with the insulating medium 5. When gas is used as the insulating medium 5, SF6 (sulfur hexafluoride) gas can be given as an example.

  A circular opening 6 is provided on the upper surface of the tank 2, and the partial discharge measuring device 1 is attached to the opening 6.

  For example, the opening 6 is an opening for attaching a dial thermometer for measuring the temperature of the insulating medium 5 in the tank 2.

  The partial discharge measuring apparatus 1 includes a flange 101, a protective tube 102, a temperature sensing unit 103, a conductive member 104, a temperature signal output terminal 105, an electromagnetic wave signal output terminal 106, a temperature signal transmission unit 107, and a first electromagnetic wave signal transmission unit 108. A temperature display unit 109 and a partial discharge measurement unit 110.

  As shown in FIGS. 2 and 3, a temperature sensing portion 103 and a conductive member 104 are accommodated in a protective tube 102 made of an insulating material.

  The conductive member 104 is a thin metal foil such as copper, for example, and the temperature-sensitive portion 103 is disposed on the central axis of the protective tube 102, and the conductive member 104 is disposed along the inner surface of the protective tube 102. The insulation distance between the temperature sensing unit 103 and the conductive member 104 is maintained. That is, the temperature sensing unit 103 and the conductive member 104 are electrically insulated.

  The conductive member 104 may be electrically insulated from the conductive member 104 by winding the conductive member 104 around the temperature-sensitive unit 103 via an insulating material.

  One surface of the cylindrical flange 101 is provided with a protective tube 102 in which the temperature sensing portion 103 and the conductive member 104 are housed, and the conductive member 104 is positioned perpendicular to the one surface of the flange 101. . A temperature signal output terminal 105 and an electromagnetic wave signal output terminal 106 are penetrated through the flange 101, the temperature sensing part 103 and the temperature signal output terminal 105 are electrically connected, and the conductive member 104 and the electromagnetic wave signal output terminal 106 are electrically connected. Connected.

  On the other surface of the flange 101, the temperature signal output terminal 105 and one end of the temperature signal transmission unit 107 are connected, and the electromagnetic wave signal output terminal 106 and one end of the first electromagnetic wave signal transmission unit 108 are connected.

  A temperature display unit 109 is provided on the side surface of the tank 2 and is connected to the other end of the temperature signal transmission unit 107.

  The other end of the first electromagnetic wave signal transmission unit 108 is connected to the partial discharge measurement unit 110. The partial discharge measuring unit 110 is preferably one that can select a measurement frequency band.

  The partial discharge measuring apparatus 1 configured as described above is detachably attached to the tank 2 by fitting the flange 101 into the opening 6 and fastening with the bolt 111.

  When the flange 101 is attached to the tank 2, at least a part of the protective tube 102 can be disposed in the insulating medium 5.

  The partial discharge measuring device 1 may be detachably attached to the tank 2 by screwing the outer peripheral side surface of the flange 101 and the inner peripheral side surface of the opening 6.

  Next, the operation of each component of the partial discharge measuring apparatus 1 will be described with reference to FIGS.

  FIG. 4 is a flowchart showing a partial discharge measuring operation of the partial discharge measuring apparatus according to the first embodiment.

  As shown in FIG. 1, when a partial discharge occurs inside the static dielectric device, an electromagnetic wave is radiated and propagates radially toward the inner wall surface of the tank 2. A part of the electromagnetic wave generated by the partial discharge passes through the protective tube 102 made of an insulating material and reaches the conductive member 104.

  The conductive member 104 detects an electromagnetic wave caused by the partial discharge (Step S201).

  Since the conductive member 104 is positioned perpendicular to one surface of the flange 101, it can be regarded as equivalent to a monopole antenna. When the length in the vertical direction of the conductive member 104 with respect to one surface of the flange 101 is L and the wavelength of the electromagnetic wave is λ, the maximum sensitivity is obtained when λ = 4L. Therefore, the frequency f [Hz] expressed by Equation (1) ] Can be detected.

f = v / λ = v / 4L (1)
Here, v is the propagation speed of the electromagnetic wave.

  The electromagnetic wave signal output terminal 106 outputs an electromagnetic wave signal (electromagnetic wave signal) detected by the conductive member 104 to the first electromagnetic wave signal transmission unit 108 (step S202).

  The partial discharge measurement unit 110 acquires the electromagnetic wave signal output from the electromagnetic wave signal output terminal 106 via the first electromagnetic wave signal transmission unit 108, and measures the partial discharge based on the electromagnetic wave signal (step S203).

  FIG. 5 is a flowchart showing the temperature measuring operation of the partial discharge measuring apparatus according to the first embodiment.

  The temperature sensing unit 103 detects the temperature of the insulating medium 5 (step S301).

  The temperature signal output terminal 105 outputs a signal (temperature signal) corresponding to the temperature detected by the temperature sensing unit 103 to the temperature signal transmission unit 107 (step S302).

  The temperature display unit 109 acquires the temperature signal output from the temperature signal output terminal 105 via the temperature signal transmission unit 107, and displays the temperature corresponding to the temperature signal (step S303).

  Since the protective tube 102 is made of an insulating material, it can transmit the electromagnetic waves generated by the partial discharge as described above. Further, since the protective tube 102 is disposed in the tank 102, it needs to be able to withstand the internal pressure due to the insulating medium 5. Therefore, specifically, for example, glass fiber reinforced plastic (FRP) is suitable.

  As described above, the partial discharge measuring apparatus 1 according to the first embodiment can be attached to the opening 6 of the tank 2 of the stationary dielectric device. When the partial discharge measurement device 1 is attached to the tank 2 of the static dielectric device and the partial discharge measurement is performed, the conductive member 104 is disposed in a space electromagnetically shielded by the tank 2 and the flange 101, so that external noise is present. The electromagnetic waves accompanying partial discharge can be detected with high sensitivity.

  In addition, since the conductive member 104 is housed in the protective tube 102 and does not directly touch the insulating medium 5, it is possible to prevent foreign matter and moisture from entering the tank 2.

  In addition, since the opening part provided in the existing static dielectric apparatus can be utilized as the opening part 6 in order to install a dial thermometer, it can be easily applied to the existing static dielectric apparatus.

  Furthermore, both partial discharge measurement and temperature measurement are possible, leading to a reduction in the burden on the measurer.

(Second Embodiment)
The configuration of the second embodiment will be described with reference to the drawings. In addition, the same part as 1st Embodiment is shown with the same code | symbol, and description is abbreviate | omitted.

  FIG. 6 is a perspective view showing the configuration of the partial discharge measuring apparatus according to the second embodiment, and FIG. 7 is a view taken along arrow BB in FIG.

  The second embodiment is different from the first embodiment in that a plurality of conductive members 104 are accommodated in the protective tube 102.

  Inside the protective tube 102 attached to one surface of the flange 101, a temperature sensing part 103 and a plurality of strip-like conductive members 104a, 104b, 104c, 104d are housed. The temperature sensing part 103 and the conductive member 104 are accommodated. Is electrically insulated.

  In addition, the conductive members 104a, 104b, 104c, and 104d have different vertical lengths with respect to one surface of the flange 101 on which the protective tube 102 is provided.

  A plurality of electromagnetic wave signal output terminals 106 corresponding to the conductive member 104 are penetrated through the flange 101, and the conductive members 104a to 104d and the electromagnetic wave signal output terminals 106a to 106d are electrically connected to each other.

  On the other surface of the flange 101, one end of each of the electromagnetic wave signal output terminals 106a to 106d and the first electromagnetic wave signal transmission units 108a to 108d is connected.

  The other ends of the first electromagnetic wave signal transmission units 108 a to 108 d are connected to the partial discharge measurement unit 110.

  In the second embodiment, since a plurality of conductive members 104 having different vertical lengths with respect to one surface of the flange 101 are accommodated in the protective tube 102, different frequency bands as shown in Equation (1) are stored. Electromagnetic waves can be detected. By detecting electromagnetic waves with different frequency bands, partial discharge can be measured with higher sensitivity.

(Third embodiment)
The configuration of the third embodiment will be described with reference to the drawings. In addition, the same part as 1st Embodiment and 2nd Embodiment is shown with the same code | symbol, and description is abbreviate | omitted.

  FIG. 8 is a cross-sectional view showing a configuration of a static dielectric device according to the third embodiment.

  The third embodiment is different from the first embodiment and the second embodiment in that a relay unit 401 and a second electromagnetic wave signal transmission unit 402 are provided.

  The relay unit 401 is provided on the side surface of the tank 2 and has a first connection terminal 403 and a second connection terminal 404.

  A protective tube 102 is provided on one surface of the flange 101, and the electromagnetic wave signal output terminal 106 and one end of the first electromagnetic wave signal transmission unit 108 are connected to the other surface of the flange 101.

  The other end of the first electromagnetic wave signal transmission unit 108 is connected to the first connection terminal 403 of the relay unit 401. When there are a plurality of first electromagnetic wave signal transmission units 108, the relay unit 401 has a plurality of first connection terminals 403, and the first connection terminals 403 are connected to the respective first electromagnetic wave signal transmission units 108. You may comprise.

  One end of the second electromagnetic wave signal transmission unit 402 is connected to the second connection terminal 404 of the relay unit 401, and the other end of the second electromagnetic wave signal transmission unit 402 is connected to the partial discharge measurement unit 110.

  Since the temperature of the insulating medium 5 is higher in the upper part than in the lower part in the tank 2, a dial thermometer for measuring the temperature of the insulating medium 5 is often provided in the upper part of the tank 2.

  Therefore, when an opening for installing a dial thermometer is used as the opening 6, the measurer climbs to the upper surface of the tank 2 and directly connects the first electromagnetic wave signal transmission unit 108 to the electromagnetic wave signal output terminal 106 located on the upper surface of the tank 2. Or the second electromagnetic wave signal transmission unit 402 needs to be connected.

  However, in this third embodiment, the measurer climbs to the upper surface of the tank 2 by having the relay unit 401, and the first electromagnetic wave signal transmission unit 108 and the second electromagnetic wave signal transmission unit 402 are directly connected to the electromagnetic wave signal output terminal 106. No need to connect.

  That is, when the electromagnetic wave signal output terminal 106 and the first connection terminal 403 are connected via the first electromagnetic wave signal transmission unit 108, the measurer transmits the second electromagnetic wave signal connected to the partial discharge measurement unit 110. The partial discharge can be measured only by connecting the portion 402 to the second connection terminal 404, and the work can be performed safely and efficiently.

  Therefore, the relay unit 401 is provided at a height of about 150 cm from the ground on which the tank 2 is installed so that the operator can easily connect the second electromagnetic wave signal transmission unit 402 to the second connection terminal 404. Is preferred.

  In addition, partial discharge can be measured without stopping the application of static dielectric equipment.

  Note that the relay unit 401 may have a function of converting the electromagnetic wave signal transmitted by the first electromagnetic wave signal transmission unit 108 into an optical signal. At this time, by using an optical cable as the second electromagnetic wave signal transmission unit 402, it is possible to suppress the influence of external noise and to measure partial discharge with higher sensitivity.

(Fourth embodiment)
The configuration of the fourth embodiment will be described with reference to the drawings. The same parts as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 9 is a plan view showing the configuration of a static dielectric device according to the fourth embodiment.

  The fourth embodiment is different from the first to third embodiments in that the tank 2 has a plurality of openings 6.

  The tank 2 has a plurality of openings 6 on the upper surface, and the partial discharge measuring device 1 is attached to each opening 6.

  By being configured in this way, the partial discharge occurrence position can be evaluated by the difference in time when each partial discharge measuring device 1 detects the electromagnetic wave.

  For example, openings 6a, 6b, and 6c are provided at three positions in the four corners of the upper surface of the tank 2, and the partial discharge measuring devices 1a, 1b, and 1c are attached to the openings. The sections to which the partial discharge measuring devices 1a, 1b, and 1c are attached when the upper surface of the tank 2 is virtually divided into four are defined as sections 501a, 501b, and 501c, respectively.

  The longer the linear distance between the partial discharge occurrence position and the partial discharge measurement device 1, the slower the arrival time of the electromagnetic wave. Therefore, the partial discharge measurement device 1a is compared with the partial discharge measurement device 1b, and the partial discharge measurement device 1a is first. When the electromagnetic wave is detected, it can be determined that the section 501a is closer to the partial discharge occurrence position.

  Next, the partial discharge measurement device 1a and the partial discharge measurement device 1c are compared. When the partial discharge measurement device 1a detects the electromagnetic wave first, it can be determined that the partial discharge occurrence position is in the vicinity of the section 501a.

  Finally, by comparing the partial discharge measuring device 1b and the partial discharge measuring device 1c, it can be determined whether the partial discharge occurrence position in the vicinity of the section 501a is close to the section 501b or the section 501c.

  By attaching at least three partial discharge measuring devices 1 to the tank 2 in this way, the partial discharge occurrence position can be evaluated.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1,1a, 1b, 1c ... Partial discharge measuring device 2 ... Tank 3 ... Iron core 4 ... Winding 5 ... Insulating medium 6, 6a, 6b, 6c ... Opening part 101 ... Flange 102 ... Protection tube 103 ... Temperature sensing part 104, 104a, 104b, 104c, 104d ... conductive member 105 ... temperature signal output terminal 106, 106a, 106b, 106c, 106d ... electromagnetic wave signal output terminal 107 ... temperature signal transmission unit 108, 108a, 108b, 108c, 108d ... first Electromagnetic wave signal transmission unit 109 ... temperature display unit 110 ... partial discharge measurement unit 111 ... bolt 401 ... relay unit 402 ... second electromagnetic wave signal transmission unit 403 ... first connection terminal 404 ... second connection terminals 501a, 501b, 501c ... Division

Claims (9)

A flange attachable to an opening provided on an upper surface of a static dielectric equipment tank in which an insulating medium is enclosed;
A cylindrical protective tube provided on one surface of the flange attached to the stationary dielectric device, made of an insulating material, and at least a part of which can be placed in the insulating medium;
A temperature sensing part that is housed inside the protective tube and detects the temperature of the insulating medium;
A conductive member that is housed inside the protective tube and is electrically insulated from the temperature sensing portion, and that detects electromagnetic waves caused by partial discharge;
A temperature signal output terminal that is provided on the flange and outputs a temperature signal corresponding to the temperature detected by the temperature sensing unit;
The partial discharge measuring device which has an electromagnetic wave signal output terminal which is provided in the flange and outputs an electromagnetic wave signal of the electromagnetic wave detected by the conductive member.   The partial discharge measuring device according to claim 1, wherein a plurality of conductive members having different vertical lengths with respect to the one surface of the flange are housed in the protective tube.   The partial discharge measuring device according to claim 1, wherein the protective tube is made of glass fiber reinforced plastic. A tank filled with an insulating medium and provided with at least one opening on the upper surface;
An iron core stored in the tank;
A winding wound around the main leg of the iron core;
A flange attached to the opening;
A cylindrical protective tube attached to one surface of the flange, made of an insulating material, and at least partially positioned in the medium when the flange is attached to the stationary dielectric device;
A temperature sensing part that is housed inside the protective tube and detects the temperature of the insulating medium;
A conductive member that is housed inside the protective tube and is electrically insulated from the temperature sensing portion, and that detects electromagnetic waves caused by partial discharge;
A temperature signal output terminal that is provided on the flange and outputs a temperature signal corresponding to the temperature detected by the temperature sensing unit;
An electromagnetic wave signal output terminal that is provided on the flange and outputs an electromagnetic wave signal of the electromagnetic wave detected by the conductive member;
One end of the flange on the other surface is connected to the temperature signal output terminal, and a temperature signal transmission unit that transmits the temperature signal;
A static dielectric device having a temperature display unit that is connected to the other end of the temperature signal transmission unit and displays a temperature corresponding to the temperature signal. A first electromagnetic wave signal transmission unit for transmitting the electromagnetic wave signal, one end of which is connected to the electromagnetic wave signal output terminal on the other surface of the flange;
The stationary dielectric device according to claim 4, further comprising a relay unit provided on a side surface of the tank and provided with a connection terminal connected to the other end of the first electromagnetic wave signal transmission unit.   The static dielectric device according to claim 5, wherein the relay unit converts the electromagnetic wave signal into an optical signal. A second electromagnetic wave signal transmission unit having one end connected to the relay unit and transmitting the electromagnetic wave signal;
The static dielectric apparatus according to claim 5 or 6, further comprising a partial discharge measurement unit that is connected to the other end of the second electromagnetic wave signal transmission unit and measures partial discharge based on the electromagnetic wave signal.   The stationary dielectric device according to claim 7, wherein the second electromagnetic wave signal transmission unit is an optical cable. A thermometer for measuring the temperature of an insulating medium sealed in a tank of a stationary dielectric device can be attached, and the inside of a cylindrical protective tube made of an insulating material inserted into an opening provided on the upper surface of the tank An electromagnetic wave detecting step in which the conductive member accommodated in the electromagnetic wave detects electromagnetic waves caused by partial discharge;
An electromagnetic wave signal output terminal for outputting an electromagnetic wave signal of the electromagnetic wave detected by the conductive member;
A partial discharge measuring method, comprising: a partial discharge measuring step in which a partial discharge measuring unit measures a partial discharge based on the electromagnetic wave signal.

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