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JP4880343B2 - Partial discharge detection method - Google Patents
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JP4880343B2 - Partial discharge detection method - Google Patents

Partial discharge detection method Download PDF

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JP4880343B2
JP4880343B2 JP2006104237A JP2006104237A JP4880343B2 JP 4880343 B2 JP4880343 B2 JP 4880343B2 JP 2006104237 A JP2006104237 A JP 2006104237A JP 2006104237 A JP2006104237 A JP 2006104237A JP 4880343 B2 JP4880343 B2 JP 4880343B2
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partial discharge
ultrasonic sensor
mold switch
mold
discharge detection
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JP2007278794A (en
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一夫 中田
邦明 田中
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Hokuriku Electric Power Co
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Description

本発明は、地中配電線の系統切替用のモールド開閉器から部分放電が発生したことを超音波センサーで検出するための方法に関する。   The present invention relates to a method for detecting by an ultrasonic sensor that a partial discharge has occurred from a mold switch for system switching of an underground distribution line.

配電線を地中に敷設してある箇所では、配電線の系統切替のため、路上機器が設置されている。路上機器は、密閉ケース内にモールド開閉器を複数まとめて収容してあり、密閉ケース及びモールド開閉器には水浸入防止用にパッキンが施されている。というのも、水分がモールド開閉器内部に浸入すると、部分放電が発生し、硝酸等の劣化促進物質が生成され、絶縁抵抗が低下し、最終的に絶縁破壊から停電に至るからである。水分がモールド開閉器内部に浸入する仕組みは、以下のように考えられている。梅雨期や、降雪地域の冬期には、密閉ケース内部に結露が発生する。また、モールド開閉器への通電量は変化するものであり、通電量の変化に伴ってモールド開閉器の温度変化が生じ、パッキンが劣化している場合には温度変化に伴う呼吸作用により結露の水分がモールド開閉器内部に浸入するのである。   In the place where the distribution line is laid in the ground, on-road equipment is installed for switching the distribution line system. The on-road equipment contains a plurality of mold switches in a sealed case, and the sealed case and the mold switch are packed to prevent water from entering. This is because when moisture enters the mold switch, a partial discharge is generated, a deterioration promoting substance such as nitric acid is generated, the insulation resistance is lowered, and finally the insulation breakdown leads to a power failure. The mechanism by which moisture enters the mold switch is considered as follows. In the rainy season and in winter during snowfall, condensation occurs inside the sealed case. Also, the energization amount to the mold switch changes, and when the energization amount changes, the temperature of the mold switch changes, and when the packing is deteriorated, dew condensation occurs due to the breathing action accompanying the temperature change. Moisture enters the mold switch.

停電に至る絶縁低下を確実に防ぐためには、モールド開閉器を実際に開いて内部を点検し、劣化状況(電極や炭素の付着具合)に応じて部品を交換等すれば良いが、開くと停電が生じるので、部品を交換等しない場合にはたとえ点検のためとは言えどもモールド開閉器を開くことは避けたいのが現状である。   In order to prevent the insulation drop leading to the power failure, the mold switch can be opened and the inside can be inspected, and the parts can be replaced according to the deterioration status (electrode and carbon adhesion). Therefore, when parts are not replaced, it is desirable to avoid opening the mold switch even if it is for inspection.

また、路上機器内部にはモールド開閉器が3回路から5回路あり、各回路は3相に分かれているため、点検箇所は9箇所から15箇所あり、その全てに部分放電の有無を検出する装置をつけることは現実的ではない。   In addition, there are 3 to 5 mold switches in the roadside equipment, and each circuit is divided into 3 phases, so there are 9 to 15 inspection points, all of which detect the presence or absence of partial discharge It is not realistic to put on.

そこでモールド開閉器を閉じたまま部分放電の発生の有無を検出できる方法として、超音波センサーを、シリコングリスのような接触媒体を介してモールド開閉器に数秒程、押し当てる作業を、繰り返す方法が存在する(特許文献1)。
特開2004−61358号公報
Therefore, as a method for detecting the occurrence of partial discharge while the mold switch is closed, there is a method of repeatedly pressing the ultrasonic sensor against the mold switch for several seconds through a contact medium such as silicon grease. Exists (Patent Document 1).
JP 2004-61358 A

接触媒体としてシリコングリスをモールド開閉器の上部に塗布するのは、モールド開閉器上部には微小な凹凸があり、超音波センサーの測定面を凹凸のある部分にそのまま押し当てると、検出精度が悪化するからである。   Silicon grease as the contact medium is applied to the upper part of the mold switch because the upper part of the mold switch has minute irregularities, and if the measurement surface of the ultrasonic sensor is pressed against the irregular part as it is, the detection accuracy deteriorates. Because it does.

ところで、モールド開閉器に多量の水分が浸入し、例えば50pC〜100pC(ピコ・クーロン)程度の放電量が発生したものであれば、シリコングリスを用いた検出方法で部分放電を検出できるが、放電量が微量な場合、例えば20pC程度の場合は検出できないことが図3の試験結果に示すように分かった。従って、放電量が微量のとき、即ち、部分放電の初期段階で発生の有無を検出できることが望ましい。ちなみに、モールド開閉器の点検結果から部分放電は、20pC程度のものが多く存在することが推測される。   By the way, if a large amount of moisture enters the mold switch and a discharge amount of, for example, about 50 pC to 100 pC (pico coulomb) is generated, a partial discharge can be detected by a detection method using silicon grease. As shown in the test results of FIG. 3, it was found that detection was not possible when the amount was very small, for example, about 20 pC. Therefore, it is desirable that the presence or absence of occurrence can be detected when the discharge amount is small, that is, at the initial stage of partial discharge. By the way, it is presumed that there are many partial discharges of about 20 pC from the inspection result of the mold switch.

また、超音波センサーをモールド開閉器に押し当てた場合に、シリコングリスの粘性により、超音波センサーが横方向にずれやすく、作業し難かった。   Also, when the ultrasonic sensor was pressed against the mold switch, the ultrasonic sensor was liable to shift laterally due to the viscosity of silicon grease, making it difficult to work.

さらに、モールド開閉器上部に塗布したシリコングリスを測定後に拭き取ろうとしても、完全な拭き取りは作業スペースや作業時間との関係上難しく、残ったシリコングリスは美観上好ましくないだけでなく、次回測定時までに硬化して悪影響を及ぼすおそれがあるため、残ったシリコングリスを剥がし取る煩わしさがある。かといって、シリコングリスを剥がしとると、モールド開閉器の上面も傷つき、剥がし取った粉末が路上機器内に飛散し、モールド開閉器の絶縁性能を低下させるという問題点があった。   Furthermore, even if you try to wipe off the silicon grease applied to the upper part of the mold switch after measurement, it is difficult to completely wipe it off due to the work space and working time. Since there is a possibility that it will harden and have an adverse effect by the time, there is an annoyance to peel off the remaining silicon grease. However, when the silicon grease is peeled off, the upper surface of the mold switch is damaged, and the peeled-off powder is scattered in the on-road equipment, resulting in a problem that the insulation performance of the mold switch is lowered.

本発明は上記実情を考慮して創作されたもので、その目的は、放電量が微量であっても検出することができ、しかも、検出作業を容易にし、その上、検出作業後の拭き取りを不要とする接触媒体を用いた検出方法を見つけ出すことである。   The present invention was created in consideration of the above circumstances, and its purpose is to detect even a small amount of discharge, and to facilitate the detection work, and furthermore, to wipe off after the detection work. It is to find a detection method using a contact medium that is unnecessary.

本発明は、路上機器の密閉ケースを開いてその中に収容された配電線系統切替用のモールド開閉器に超音波センサーを押し当て、超音波センサーから得られる信号波形によって部分放電の有無を見分ける部分放電検出方法であって、30kHz付近の超音波を検出可能な超音波センサーを用いると共に、超音波センサーの測定面にクロロプレンゴム製の接触媒体を止めてあることを特徴とする
The present invention opens an airtight case of a road device , presses an ultrasonic sensor against a mold switch for switching a distribution line system accommodated therein, and identifies the presence or absence of partial discharge by a signal waveform obtained from the ultrasonic sensor A partial discharge detection method, characterized in that an ultrasonic sensor capable of detecting an ultrasonic wave in the vicinity of 30 kHz is used, and a contact medium made of chloroprene rubber is stopped on the measurement surface of the ultrasonic sensor.

本発明は、接触媒体がゴムなので、その弾力性によって超音波センサーをモールド開閉器に確実に押し当てられ、従来のシリコングリスのように横ずれすることなく、検出作業が容易となる。また、予め接触媒体を超音波センサーの測定面に止めてあるので、従来のように塗ったり拭いたりせずに済み、単に押し当てる作業を繰り返すだけでよくなり、作業性が向上すると共に、モールド開閉器を検出作業前と変わらない状態で保持できる。さらに、ゴムは20pC程度の微量の放電量であっても検出できる。その上、クロロプレンゴムを用いているので、シリコンゴムを用いる場合よりも、さらに検出精度が向上する。
In the present invention, since the contact medium is rubber, the ultrasonic sensor is surely pressed against the mold switch by its elasticity, and the detection operation is facilitated without causing lateral displacement as in the case of conventional silicon grease. In addition, since the contact medium is stopped on the measurement surface of the ultrasonic sensor in advance, it is not necessary to apply and wipe as in the conventional case, and it is only necessary to repeat the pressing operation. The switch can be held in the same state as before detection. Furthermore, rubber can be detected even with a small discharge amount of about 20 pC. In addition, since chloroprene rubber is used, the detection accuracy is further improved as compared with the case of using silicon rubber .

路上機器1は図1(イ)、(ロ)に示すように、密閉ケース2内を上下に仕切る仕切板3を備え、仕切板3の上に三相一組からなる一回路分のモールド開閉器4を複数回路分(図1(イ)では3回路分)左右に間隔をあけて並べ、密閉ケース2の底からケーブル5を貫通し、そのケーブル5を仕切板3の下から各組のモールド開閉器4に接続してある。   As shown in FIGS. 1 (a) and 1 (b), the on-road equipment 1 includes a partition plate 3 for partitioning the inside of the sealed case 2 up and down, and a mold opening and closing for one circuit consisting of a set of three phases on the partition plate 3. The devices 4 are arranged for a plurality of circuits (three circuits in FIG. 1 (a)) with a space left and right, and through the cable 5 from the bottom of the sealed case 2, the cable 5 is connected to each set from the bottom of the partition plate 3. It is connected to the mold switch 4.

密閉ケース2は、前面が開放されたケース本体6に扉7を開閉可能に設けたもので、閉じた扉7とケース本体6の間にはパッキン8を介在しており、密閉ケース2内への水分の浸入を防いでいる。   The sealed case 2 is provided with a door 7 that can be opened and closed on a case body 6 whose front surface is open, and a packing 8 is interposed between the closed door 7 and the case body 6 so that the sealed case 2 can be opened. Prevents the ingress of moisture.

一回路分のモールド開閉器4は図1(ロ)に示すように、三相分のモールド開閉器4を奥行き方向(図の左右方向)に間隔をあけて並べてある。各モールド開閉器4は図2の結線図に示すように3つのモールド開閉器4の導通を図る側の接点9、ケーブル5側の接点10を開閉するものである。また、モールド開閉器4は仕切板3に固定する固定部11と、固定部11に対して開閉可能に設けた蓋部12からなり、固定部11にケーブル5側の電極(図示せず)を内蔵し、一方、蓋部12に短絡用電極(図示せず)を内蔵してある。三相分のモールド開閉器4はその蓋部12上面の横幅中央部を連結金物13で一体化し、図示しないレバー機構を用いて三相分の蓋部12をまとめて開閉する。蓋部12を閉じると、固定部11の回りを囲むシールパッキンPが潰れて密閉が確保される。蓋部12の上面は連結金物13の横側箇所を、超音波センサー14を押し当てる箇所とする。   As shown in FIG. 1 (b), the mold switch 4 for one circuit has the three-phase mold switches 4 arranged in the depth direction (left-right direction in the figure) at intervals. As shown in the connection diagram of FIG. 2, each mold switch 4 opens and closes the contact 9 on the side where the three mold switches 4 are conducted and the contact 10 on the cable 5 side. The mold switch 4 includes a fixing portion 11 that is fixed to the partition plate 3 and a lid portion 12 that can be opened and closed with respect to the fixing portion 11, and an electrode (not shown) on the cable 5 side is provided on the fixing portion 11. On the other hand, a short-circuit electrode (not shown) is built in the lid 12. The mold switch 4 for the three phases integrates the central portion of the width of the upper surface of the lid portion 12 with the connecting hardware 13, and collectively opens and closes the lid portion 12 for the three phases using a lever mechanism (not shown). When the lid portion 12 is closed, the seal packing P surrounding the fixed portion 11 is crushed to ensure sealing. On the upper surface of the lid portion 12, the lateral side portion of the connection hardware 13 is a portion where the ultrasonic sensor 14 is pressed.

超音波センサー14の測定面とモールド開閉器4との間に介在する接触媒体15には、ゴム(天然ゴム、合成ゴム)を用いる。ゴムの大きさは、超音波センサ−14の測定面よりも一回り大きくした。部分放電の検出精度の良いゴムを見つけ出すために比較試験を行った。試験は、何種類かの均一な厚みのゴムを超音波センサー14の測定面全域に両面テープを用いて貼り付け、超音波センサー14の裏に付いたゴムをモールド開閉器4の上面(蓋部12)に適度な圧力で押し当て、超音波センサー14から得られる信号波形をオシロスコープ等で表示する条件で行われた。比較試験の結果を図3のグラフに示す。これによりクロロプレンゴムであれば、放電量の多い場合であっても(50pC〜100pC)、微量の場合であっても(20pC)、確実に部分放電の有無を検出できることがわかる。また、別の試験結果よりクロロプレンゴムは、硬度を約60度以下とし、厚みを約1mm以下とするものが望ましい。さらに、モールド開閉器4内部で生じる部分放電を超音波センサー14で検出した場合の周波数成分は、部分放電が発生していない場合に比較して、約30kHz付近での信号が増加していることより、30kHz付近の検出感度が高い超音波センサー14を用いることで、さらに検出精度が向上する。なお、ここで用いる超音波センサーはAEセンサー(AE:Acoustic Emission)とも言われる。AEセンサーの基本的な構造は、弾性波の検出素子(例えば圧電セラミックス)をケースに封入するとと共に、ケースの測定面側を受信板(例えばセラミックス)で形成し、受信板の上に検出素子を載置した構造である。   Rubber (natural rubber or synthetic rubber) is used for the contact medium 15 interposed between the measurement surface of the ultrasonic sensor 14 and the mold switch 4. The size of the rubber was slightly larger than the measurement surface of the ultrasonic sensor-14. A comparative test was conducted to find rubber with good detection accuracy of partial discharge. In the test, several kinds of uniform-thickness rubbers are attached to the entire measurement surface of the ultrasonic sensor 14 using double-sided tape, and the rubber attached to the back of the ultrasonic sensor 14 is attached to the upper surface of the mold switch 4 (the lid portion). 12) was performed under the condition that the signal waveform obtained from the ultrasonic sensor 14 was displayed on an oscilloscope or the like by pressing with an appropriate pressure. The result of the comparative test is shown in the graph of FIG. Thus, it can be seen that the presence or absence of partial discharge can be reliably detected with chloroprene rubber even when the amount of discharge is large (50 pC to 100 pC) or even when the amount is small (20 pC). From another test result, the chloroprene rubber desirably has a hardness of about 60 degrees or less and a thickness of about 1 mm or less. Furthermore, the frequency component when the partial discharge generated inside the mold switch 4 is detected by the ultrasonic sensor 14 has an increased signal around 30 kHz compared to when the partial discharge is not generated. Therefore, the detection accuracy is further improved by using the ultrasonic sensor 14 having a high detection sensitivity in the vicinity of 30 kHz. In addition, the ultrasonic sensor used here is also called AE sensor (AE: Acoustic Emission). The basic structure of the AE sensor is that an acoustic wave detection element (for example, piezoelectric ceramics) is enclosed in a case, the measurement surface side of the case is formed of a reception plate (for example, ceramics), and the detection element is placed on the reception plate. It is a mounted structure.

(イ)(ロ)図は部分放電検出方法を示す正面方向の断面図、側面方向の断面図である。(A) and (b) are a front sectional view and a side sectional view showing a partial discharge detection method. モールド開閉器の結線図である。It is a connection diagram of a mold switch. ゴムの性能を示すグラフである。It is a graph which shows the performance of rubber | gum.

符号の説明Explanation of symbols

1路上機器、2密閉ケース、3仕切板、4モールド開閉器、5ケーブル、6ケース本体、
7扉、8パッキン、9接点、10接点、11固定部、12蓋部、13連結金物、
14超音波センサー、15接触媒体、Pシールパッキン
1 on-road equipment, 2 sealed case, 3 partition plate, 4 mold switch, 5 cable, 6 case body,
7 doors, 8 packings, 9 contacts, 10 contacts, 11 fixed parts, 12 lid parts, 13 connecting hardware,
14 ultrasonic sensors, 15 contact media, P seal packing

Claims (1)

路上機器(1)の密閉ケース(2)を開いてその中に収容された配電線系統切替用のモールド開閉器(4)に超音波センサー(14)を押し当て、超音波センサー(14)から得られる信号波形によって部分放電の有無を見分ける部分放電検出方法であって、
30kHz付近の超音波を検出可能な超音波センサー(14)を用いると共に、超音波センサー(14)の測定面にクロロプレンゴム製の接触媒体(15)を止めてあることを特徴とする部分放電検出方法。
Open the airtight case (2 ) of the roadside equipment (1) and press the ultrasonic sensor (14) against the mold switch (4) for switching the distribution line system housed in the sealed case (2). A partial discharge detection method for distinguishing the presence or absence of partial discharge from the signal waveform obtained,
Partial discharge detection characterized by using an ultrasonic sensor (14) capable of detecting ultrasonic waves in the vicinity of 30 kHz and stopping a contact medium (15) made of chloroprene rubber on the measurement surface of the ultrasonic sensor (14). Method.
JP2006104237A 2006-04-05 2006-04-05 Partial discharge detection method Expired - Fee Related JP4880343B2 (en)

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CN116047240A (en) * 2022-12-29 2023-05-02 国网重庆市电力公司市南供电分公司 Switch cabinet partial discharge detection device based on combined detection of ozone and ultrasonic

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JPS5618762A (en) * 1979-07-25 1981-02-21 Fuji Electric Co Ltd Detecting method and apparatus for internal corona for molded electric appliance
JPS62194475A (en) * 1985-08-22 1987-08-26 Mitsubishi Electric Corp Apparatus for monitoring internal discharge of stationary induction machinery
JPH05172894A (en) * 1991-12-26 1993-07-13 Fujikura Ltd Partial discharge detection device
JP3678837B2 (en) * 1996-03-29 2005-08-03 株式会社日立メディコ Acoustic medium for probe of ultrasonic diagnostic equipment

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