WO2016052314A1 - 絶縁劣化監視装置 - Google Patents
絶縁劣化監視装置 Download PDFInfo
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- WO2016052314A1 WO2016052314A1 PCT/JP2015/077029 JP2015077029W WO2016052314A1 WO 2016052314 A1 WO2016052314 A1 WO 2016052314A1 JP 2015077029 W JP2015077029 W JP 2015077029W WO 2016052314 A1 WO2016052314 A1 WO 2016052314A1
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- insulator
- metal member
- current sensor
- ground metal
- monitoring device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
Definitions
- the present invention relates to an insulation deterioration monitoring device that monitors the deterioration state of an insulator that supports a charging part of an electrical device such as a switchboard.
- a conductor is provided in the interphase part of the insulating frame that accommodates the three-phase vacuum circuit breaker, this conductor is connected to the ground metal, and is transmitted to the outside or the inside of the insulating frame due to insulation deterioration of the insulating frame, and between the charging unit phases
- a technique for grasping the degree of insulation degradation by guiding the leakage current flowing through the conductor to a ground metal through a conductor and operating the ground fault relay to detect the leakage current is known (see, for example, Patent Document 2). .
- JP 2014-23401 A (page 3, FIG. 1) JP 2003-83831 A (page 3, FIG. 1-3)
- the insulation deterioration monitoring technique described in Patent Document 2 is effective for insulation monitoring of an insulating frame that accommodates a three-phase vacuum circuit breaker.
- a configuration in which a large number of insulators that support the high-voltage charging unit are arranged it is difficult to identify a deteriorated insulator, and there is a problem in applying it to an insulator that supports the charging unit in general.
- the present invention was made to solve the above problems, and even when there are a plurality of insulators that support the high-voltage charging part such as a switchboard, the deterioration state of the insulators is always constantly reduced with a simple configuration.
- An object of the present invention is to obtain an insulation deterioration monitoring device capable of monitoring the deterioration and determining the degree of deterioration.
- An insulation deterioration monitoring device is an insulation deterioration monitoring device for an insulator that insulates and supports a high-voltage charging part of an electric device on a ground metal member, and is inserted into a connection portion between the insulator and the ground metal member, A current sensor that detects a leakage current that flows from the high-voltage charging unit to the ground metal member through the insulator, and a determination unit that is connected to the output side of the current sensor and determines the degree of deterioration of the insulator based on the value of the leakage current. It is what you have.
- a current sensor that detects a leakage current that flows from the high-voltage charging unit to the ground metal member through the insulator, and a determination unit that determines the degree of deterioration of the insulator based on the value of the detected leakage current Therefore, it is possible to constantly monitor the leakage current flowing from the high-voltage charging part to the ground metal member through the insulator, and to determine the degree of deterioration of the insulator by increasing the leakage current value.
- the timing for replacing the insulator can be estimated. Moreover, since it can apply easily to each insulator of an electric equipment which has a some insulator, identification of the deteriorated insulator becomes easy.
- FIG. 1 is a front view showing an insulation deterioration monitoring apparatus according to Embodiment 1.
- FIG. FIG. 2 is a detailed view of the ground side mounting portion of the insulation deterioration monitoring apparatus of FIG. 1, and is an exploded perspective view of FIG. 1 viewed from below.
- an insulator to be monitored for deterioration an insulator that supports a charging unit of an electrical device such as a switchboard is shown as an example, and the high-voltage charging unit 1 is a bus or a main circuit conductor.
- the ground metal member 2 is a part of the casing of the switchboard or a supporting metal member fixed to the casing and is grounded.
- the insulator 3 is a support insulator, for example.
- the high voltage charging unit 1 is supported and fixed to the ground metal member 2 through the insulator 3.
- the high-voltage charging unit 1 is fixed to the insulator 3 by a charging unit fixing bolt 4.
- the insulator 3 and the ground metal member 2 are fixed by a grounding portion fixing bolt 5.
- a current sensor 6 is disposed at a connection portion between the insulator 3 and the ground metal member 2.
- the current sensor 6 is composed of an annular through-type current detector. Specifically, the current sensor 6 is, for example, a small through-type CT, and flows from the high-voltage charging unit 1 through the insulator 3 to the ground metal member 2. Is to detect a leakage current.
- the output side which is the secondary side of the current sensor 6 is connected to the determination means 8 via the lead wire 7.
- the determination unit 8 is provided, for example, in a control unit of an electric device in which the high voltage charging unit 1 and the insulator 3 are accommodated.
- a buried metal 9 made of a cylindrical metal member is embedded in the end of the insulator 3 connected to the ground metal member 2.
- a mounting internal thread is machined in the center of the buried metal 9.
- a projecting portion 9 a is formed by projecting the attachment side end portion from the end surface of the insulator 3.
- the protruding length of the protruding portion 9a is preferably slightly longer than the thickness of the current sensor 6.
- the outer diameter of the protruding portion 9a is smaller than the inner diameter of the annular current sensor 6, and the current sensor 6 can be easily fitted to the protruding portion 9a.
- the insulator 3 is also provided with a buried metal on the side of the connection portion with the high-voltage charging unit 1, illustration and description are omitted because it is not a main part of the present invention.
- the insulating material 3 that supports the high-voltage charging unit 1 deteriorates over time due to long-term use, so that the insulating ability is lowered. Thereby, the leakage current which flows from the high voltage
- the leakage current flows from the high voltage charging unit 1 to the ground metal member 2 through the insulator 3. Since the insulator 3 is fixed by bringing the tip of the protruding portion 9a of the buried metal 9 into contact with the ground metal member 2, leakage current from the insulator 3 is transferred to the ground metal member 2 via the protrusion 9a. And flow.
- the current sensor 6 Since the current sensor 6 is provided so as to penetrate through the protruding portion 9a and the surface thereof is insulated, a minute leakage current flowing from the insulator 3 to the ground metal member 2 causes the protruding portion 9a of the buried metal 9 having low electrical resistance. And flow inside the current sensor 6. Therefore, a minute leak current can be detected with high accuracy and easily by the current sensor 6.
- the value of the leakage current detected by the current sensor 6 is input to the determination unit 8 through the lead wire 7.
- the determination means 8 stores the correlation data of the leakage current of the insulator 3 and the degree of deterioration acquired in advance. Therefore, by comparing with the correlation data, it is determined that the deterioration has progressed when the value of the detected leakage current exceeds a predetermined value, and this is used as a guideline for cleaning or replacement.
- FIG. 3 is an explanatory diagram illustrating an example of a method for determining insulation deterioration.
- the insulation resistance value is used as a parameter for the degree of deterioration.
- Correlation data as shown in FIG. 3 is acquired in advance for the insulator 3 to be monitored.
- the value of the leakage current with respect to the necessary minimum value of the insulation resistance necessary for maintaining the insulation performance is determined as a reference value, and these are stored in the storage unit of the determination means 8.
- correlation data are acquired for every different kind of insulator.
- the necessary minimum value may be determined from, for example, a recommended replacement time or a recommended cleaning time.
- the deterioration proceeds more than a predetermined value. For example, it is determined that the recommended replacement time for the insulator 3 has been reached, and prepares for replacement of the insulator 3. be able to. It is common for a large number of insulators that support high-voltage charging parts to be used in multiple locations inside electrical equipment, but the same insulation deterioration monitoring device must be provided for insulators that require monitoring. Thus, it becomes possible to easily identify the deteriorated insulator. Since it is only necessary to provide a small current sensor for the insulator, the installation is simple.
- the insulator 3 has been described as a support insulator, but the present invention is not limited to this, and any insulator that supports and fixes the high-voltage charging unit 1 to the ground metal member 2 can be used. Applicable to insulating support.
- the material of the insulator is not particularly limited, and can be widely applied to generally known insulating materials such as porcelain and epoxy resin.
- the current sensor 6 has been described as a through-type CT, other than this, for example, a Rogowski coil may be used.
- an insulation deterioration monitoring device for an insulator that insulates and supports a high-voltage charging unit of an electric device on a ground metal member, which is inserted into a connection portion between the insulator and the ground metal member
- a current sensor that detects a leakage current flowing from the high-voltage charging unit to the ground metal member through the insulator, and a determination unit that is connected to the output side of the current sensor and determines the degree of deterioration of the insulator based on the value of the leakage current Therefore, the leakage current flowing from the high-voltage charging unit to the ground metal member through the insulator can be monitored at all times, and the deterioration degree of the insulator can be determined by increasing the leakage current.
- a buried metal having a screw hole for mounting is provided at the end of the insulator to be connected to the ground metal member, and the opposite side of the buried metal to the ground metal member is a projecting portion protruding from the end surface of the insulator.
- the current sensor is composed of a through-type current detector, and is disposed between the insulator and the ground metal member so as to penetrate through the protruding portion. Since it flows in a concentrated manner and passes through the inside of the current sensor, the leakage current detection accuracy is improved. Further, the current sensor can be easily attached to the connecting portion between the insulator and the ground metal member, and an insulation deterioration monitoring device excellent in assembling workability can be obtained.
- FIG. FIG. 4 is a partial cross-sectional view showing a current sensor portion of the insulator deterioration monitoring apparatus according to the second embodiment.
- the one-dot chain line in the figure is an axisymmetric line, and the figure shows only the left half. Parts equivalent to those in FIG. 1 or FIG. 2 of the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and differences will be mainly described. Note that the lead wire 7 connected to the current sensor and the determination means 8 are omitted.
- the current sensor 10 of the present embodiment is provided with a plurality of pleats 10a on the outer periphery.
- the cross section of the current sensor 10 is such that the outer side of the coil at the center is covered with an insulating member as shown in the figure, so that a pleat 10a is provided on the outer peripheral side of the insulating member.
- a conductive sleeve 11 made of a cylindrical conductive member having a low electric resistance is inserted into the gap between the inner peripheral side of the current sensor 10 and the outer peripheral side of the protruding portion 9a.
- the dimensional relationship among the protruding length of the protruding portion 9a of the buried metal 9, the height of the current sensor 10 and the length of the conductive sleeve 11 is that the length of the conductive sleeve 11 is the longest, and the protruding length of the protruding portion 9a and the current sensor 10 are The height dimension is shorter than that.
- the operation will be described.
- the creeping distance of the outer peripheral portion becomes longer than that of the inner peripheral portion. For this reason, even if the insulator 3 and the current sensor 10 come into contact with each other, the leakage current mainly flows through the inner periphery of the current sensor 10.
- the conductive sleeve 11 is provided inside the current sensor 10, and the insulator 3 and the conductive sleeve 11, and the conductive sleeve 11 and the ground metal member 2 are brought into contact with each other, so that the leakage current has a low electric resistance. Flows to the ground metal member 2. As a result, the leakage current flows more reliably inside the current sensor 10, and the current sensor 10 can accurately detect a minute leakage current flowing through the insulator 3. It is possible to make a reliable determination.
- the projecting length of the projecting portion 9 a is not particularly required if the projecting length of the projecting portion 9 a is equal to or shorter than the length of the conductive sleeve 11, and the manufacturing is simplified. Further, even when the buried metal is not provided with a protruding portion with the existing insulator, it is possible to insert the conductive sleeve 11 later and attach the current sensor.
- the pleat 10a is provided on the outer periphery of the current sensor 10 and the conductive sleeve 11 is provided.
- the conductive sleeve 11 is not provided, and only the pleat 10a is provided.
- the configuration may be such that only the conductive sleeve 11 is provided without providing it, and in that case, the respective effects can be obtained individually.
- the insulation deterioration monitoring device of the second embodiment since the outer periphery of the current sensor is provided with a plurality of pleats, the leakage current flows mainly on the inner periphery of the current sensor. The detection accuracy of leakage current by the current sensor is improved.
- a cylindrical conductive sleeve is inserted on the inner circumference side of the current sensor, and one end of the conductive sleeve is in contact with the insulator and the other end is in contact with the ground metal member. Because it flows to the ground metal member through a conductive sleeve with low resistance, it can flow reliably inside the current sensor, can accurately detect the leakage current flowing through the insulator, and accurately determine the insulation deterioration status of the insulator It becomes possible.
- FIG. FIG. 5 is a diagram showing an insulation deterioration monitoring apparatus according to the third embodiment. The same parts as those in FIGS. The lead wire 7 connected to the current sensor 6 and the determination means 8 are omitted.
- the insulator 12 to be monitored in the present embodiment supports, for example, a plurality of high-voltage charging units 13 and is supported and fixed to the ground metal member 2 at a plurality of locations (two locations on both sides in the figure).
- a switchgear in which a circuit breaker or a bus bar is arranged in a housing is assumed, and a three-phase circuit connected to a three-phase circuit breaker is assumed. This is a case where the high-voltage charging unit 13 is attached to the ground metal member 2 on the housing side via the insulator 12.
- the high-voltage charging unit 13 that is a three-phase main circuit conductor is supported and fixed to one insulator 12, and two places on both sides of the insulator 12 are attached to the ground metal member 2.
- the portion surrounded by the alternate long and short dash line is the same as the attachment portion of the first embodiment, and the current sensor 6 is attached to the protruding portion 9a (not shown) of the buried metal 9 provided on the insulator 12 side. It is fixed by penetrating.
- the configuration of the attachment portion may employ the configuration of FIG. 4 of the second embodiment.
- leakage current flows to either or both of the left and right current sensors 6. Therefore, the leakage current detected by the plurality of current sensors 6 is taken into one determination means (not shown) and the values thereof are integrated to obtain the current value of the leakage current flowing through one insulator 12.
- the determination means stores the correlation data of the leakage current and the deterioration level obtained in advance, and the determination means determines the degree of deterioration of the insulator 12 by, for example, the method described in the first embodiment. judge.
- the insulator and the ground metal member are connected at a plurality of locations and have a plurality of connection portions, and each of the plurality of connection portions has a current sensor.
- the determination means integrates the leakage current values detected at the plurality of connecting portions, and determines the degree of deterioration of the insulator based on the integrated leakage current value.
- the embodiments can be freely combined, or the embodiments can be appropriately changed or omitted.
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- Chemical & Material Sciences (AREA)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
Description
また、3相の真空遮断器を収容する絶縁フレームの相間部分に導電体を設け、この導電体を接地金属に接続し、絶縁フレームの絶縁劣化により絶縁フレームの外側あるいは内側を伝わって充電部相間に流れる漏れ電流を、導電体を通じて接地金属に導き、地絡継電器を動作させてその漏れ電流を検出することで、絶縁劣化度合いを把握する技術が知られている(例えば、特許文献2参照)。
また、上記特許文献2に記載の絶縁物の劣化監視技術では、3相の真空遮断器を収容するような絶縁フレームの絶縁監視には有効であるが、例えば、接地された配電盤の筐体内に、高圧充電部を支持する絶縁物が多数配置されているような構成では、劣化した絶縁物の特定が困難であり、充電部を支持する絶縁物一般に適用するには問題があった。
また、複数の絶縁物を有するような電気機器の各絶縁物に容易に適用できるため、劣化した絶縁物の特定が容易となる。
図1は、実施の形態1による絶縁劣化監視装置を示す正面図である。図2は、図1の絶縁劣化監視装置の接地側取付部の詳細図で、図1を下方から見た分解斜視図である。
図では、劣化監視の対象とする絶縁物として、配電盤などの電気機器の充電部を支持する絶縁物の場合を一例として示しており、高圧充電部1は、母線や主回路導体である。接地金属部材2は、配電盤の筐体の一部、またはその筐体に固定された支持金属部材等であり、接地されている。また、絶縁物3は、例えば支持碍子である。この絶縁物3を介して高圧充電部1が接地金属部材2に支持され固定されている。
この絶縁物3と接地金属部材2との接続部に、電流センサ6が配置されている。電流センサ6は、円環状をした貫通型の電流検出器で構成され、具体的には、例えば小形の貫通型CTであり、高圧充電部1から絶縁物3を通り接地金属部材2に流れる微小な漏れ電流を検出するものである。
電流センサ6の2次側である出力側は、リード線7を介して判定手段8に接続されている。
判定手段8は、例えば、この高圧充電部1及び絶縁物3が収容される電気機器の制御部内に設けられている。
接地金属部材2に接続される絶縁物3の端部には、円柱状の金属部材からなる埋金9が埋設されている。埋金9の中心には取付用の雌ねじが加工されている。埋金9の接地金属部材2との対向側は、取付側端部を絶縁物3の端面より突出させて、突出部9aが形成されている。突出部9aの突出長さは、電流センサ6の厚さよりわずかに長い寸法にするのが望ましい。突出部9aの外径は、円環状をした電流センサ6の内径より小さくし、この突出部9aに電流センサ6が容易に嵌合可能としている。
なお、絶縁物3の高圧充電部1との接続部側にも埋金が設けられているのが一般的であるが、本願発明の主要部ではないので、図示及び説明は省略する。
電流センサ6のリード線7は、判定手段8に接続する。リード線7は、接地金属部材2等に束線して充電部に対し絶縁距離を確保して配線されている。
組立後の状態は、図1のようになる。
高圧充電部1を支持する絶縁物3は、長期間の使用により経年劣化することで絶縁能力が低下してくる。これにより、高圧充電部1から接地側へ流れる漏れ電流が大きくなる。
そこで、この漏れ電流を電流センサ6で常時監視し、その変化を見ることにより絶縁物3の劣化を監視するようにしたものである。
漏れ電流は絶縁物3を通って高圧充電部1から接地金属部材2へ流れる。絶縁物3は、埋金9の突出部9aの先端と接地金属部材2とを接触させて固定しているので、絶縁物3からの漏れ電流は、突出部9aを介して接地金属部材2へと流れる。
電流センサ6で検出された漏れ電流の値は、リード線7を介して判定手段8に入力される。判定手段8には、予め取得しておいた絶縁物3の漏れ電流と劣化程度の相関データを記憶させている。そこで、この相関データと比較し、検出した漏れ電流の値が、所定の値を超えた場合に劣化が進行したと判断して、清掃や取り替えの目安とする。
絶縁物3の劣化が進行すると絶縁抵抗が低下する。そこで、劣化程度のパラメータとして、絶縁抵抗値を利用するものである。絶縁物3の絶縁抵抗と漏れ電流の間には図3に太線で示すような相関関係がある。監視対象となる絶縁物3に対し、予め図3のような相関データを取得しておく。そして絶縁性能の維持に必要な絶縁抵抗の必要最小値に対する漏れ電流の値を基準値として定めておき、これらを判定手段8の記憶部に記憶させておく。
なお、基準値等は絶縁物の形状,材質等によって異なるので、相関データは種類の異なる絶縁物毎に取得しておく。また、必要最小値は、例えば、交換推奨時期や清掃推奨時期から決めればよい。
電気機器の内部には、高圧充電部を支持する絶縁物が複数箇所に多数個用いられているのが一般的であるが、監視を必要とする絶縁物に同様の絶縁劣化監視装置を備えることで、劣化した絶縁物を容易に特定することが可能となる。絶縁物に対しては、小形の電流センサを設けるだけでよいので、設置は簡単である。
また、電流センサ6は、貫通型CTとして説明したが、これ以外に、例えばロゴスキーコイルであってもよい。
また、複数の絶縁物を有する電気機器でも、容易に電流センサを設置でき、劣化した絶縁物の特定が容易となる。
図4は、実施の形態2による絶縁物の劣化監視装置の電流センサ部を示す部分断面図である。図中の一点鎖線は軸対称線であり、図は左半分のみを示している。実施の形態1の図1または図2と同等部分は同一符号で示して詳細な説明は省略し、相違点を中心に説明する。なお、電流センサにつながるリード線7と判定手段8は省略している。
さらに、電流センサ10の内周側と突出部9aの外周側との隙間に、電気抵抗の低い筒状導電部材からなる導電スリーブ11を挿入している。
埋金9の突出部9aの突出長さと電流センサ10の高さと導電スリーブ11の長さの寸法関係は、導電スリーブ11の長さを一番長くし、突出部9aの突出長さと電流センサ10の高さ寸法をそれより短くしている。これにより、図4のような取付状態において、導電スリーブ11の一端が絶縁物3と接触し他端が接地金属部材2と接触するように構成されている。
電流センサ10の外周部にひだ10aを設けることで、外周部の沿面距離が内周部より長くなる。このため、もし絶縁物3と電流センサ10が接触しても漏れ電流は主に電流センサ10の内周部を流れることになる。
また、電流センサ10の内側に導電スリーブ11を設け、絶縁物3と導電スリーブ11、及び導電スリーブ11と接地金属部材2とを確実に接触させることで、漏れ電流は電気抵抗の低い導電スリーブ11を通って接地金属部材2へと流れる。これにより、漏れ電流が、より確実に電流センサ10の内側を流れるようになり、電流センサ10で、絶縁物3に流れる微少な漏れ電流を精度よく検知できるため、絶縁物3の絶縁劣化状況を確実に判定することが可能となる。
さらに、既設の絶縁物で埋金に突起部を持たない場合でも、後から導電スリーブ11を挿入して電流センサを取り付けることも可能である。
図5は、実施の形態3による絶縁劣化監視装置を示す図である。図1,2と同等部分は同一符号を付して説明は省略する。電流センサ6につながるリード線7と判定手段8は省略している。
本実施の形態の監視対象となる絶縁物12は、例えば複数の高圧充電部13を支持し、複数箇所(図では両側の2箇所)で接地金属部材2に支持固定されている。このような絶縁物12が使用される電気機器の具体例としては、例えば、筐体内に遮断器や母線が配置されたスイッチギヤ等が想定され、3相の遮断器に接続される3相の高圧充電部13を、絶縁物12を介して筐体側の接地金属部材2に取り付けるような場合である。
Claims (5)
- 電気機器の高圧充電部を接地金属部材に絶縁支持する絶縁物の絶縁劣化監視装置であって、
前記絶縁物と前記接地金属部材との接続部に挿入されて、前記高圧充電部から前記絶縁物を通じて前記接地金属部材へ流れる漏れ電流を検出する電流センサと、
前記電流センサの出力側に接続されて、前記漏れ電流の値に基づき前記絶縁物の劣化程度を判定する判定手段と、
を有することを特徴とする絶縁劣化監視装置。 - 請求項1に記載の絶縁劣化監視装置において、
前記接地金属部材と接続する前記絶縁物の端部に、取付用のねじ穴を有する埋金が設けられ、前記埋金の前記接地金属部材との対向側が、前記絶縁物の端面より突出した突出部と
なっており、
前記電流センサは、貫通型の電流検出器で構成され、前記突出部に貫通させて前記絶縁物と前記接地金属部材との間に配置されていることを特徴とする絶縁劣化監視装置。 - 請求項2に記載の絶縁劣化監視装置において、
前記電流センサの外周部には複数のひだが設けられていることを特徴とする絶縁劣化監視装置。 - 請求項2または請求項3に記載の絶縁劣化監視装置において、
前記電流センサの内周側に円筒状の導電スリーブが挿入され、前記導電スリーブの一端が前記絶縁物と接触し他端が前記接地金属部材と接触するように構成されていることを特徴とする絶縁劣化監視装置。 - 請求項1から請求項4のいずれか1項に記載の絶縁劣化監視装置において、
前記絶縁物と前記接地金属部材とは、複数箇所で接続されて複数の接続部を有し、
前記複数の接続部のそれぞれに前記電流センサが設けられ、
前記判定手段では、前記複数の接続部において検知された前記漏れ電流の値を積算し、前記積算した漏れ電流の値に基づき前記絶縁物の劣化程度を判定するようにしたことを特徴とする絶縁劣化監視装置。
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