JPH0373873A - Partial discharge detector for electric apparatus - Google Patents

Partial discharge detector for electric apparatus

Info

Publication number
JPH0373873A
JPH0373873A JP21017289A JP21017289A JPH0373873A JP H0373873 A JPH0373873 A JP H0373873A JP 21017289 A JP21017289 A JP 21017289A JP 21017289 A JP21017289 A JP 21017289A JP H0373873 A JPH0373873 A JP H0373873A
Authority
JP
Japan
Prior art keywords
partial discharge
delay time
pulse
discharge
acoustic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP21017289A
Other languages
Japanese (ja)
Inventor
Katsumi Ekusa
江草 克己
Kunio Migite
右手 邦雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP21017289A priority Critical patent/JPH0373873A/en
Publication of JPH0373873A publication Critical patent/JPH0373873A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • G01R31/1227Testing 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

PURPOSE:To accurately detect the level of partial discharge generated in a tank independently of its generating position by providing the detector with a means for storing the attenuation coefficient of an electric pulse as a function in the partial discharge generating position. CONSTITUTION:Pulse currents detected from an electric pulse detector 7 have the relation of different attenuation coefficients in accordance with discharge generating points. The attenuation coefficient are stored in a coefficient storage device 13. An acoustic signal is transmitted through insulating oil 4 and detected by acoustic pulse detectors 9a to 9c after the lapse of different intervals and respective detecting signals are converted into pulse signals and inputted to a delay time measuring instrument 10. The acoustic delay time is measured by an acoustic signal delay time measurement starting command outputted from the detector 7. An arithmetic unit 11 receiving the measured result calculates the discharge generating position from respective acoustic signal delay time values and highly accurately calculates the level of partial discharge from the positional data, a pulse current peak value generated from a discharge level measuring instrument 8 and the attenuation coefficients outputted from the device 13.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、電気機器例えば油入り変圧器のような容器
内に本体を収納した電気機器の内部で発生した部分放電
を検出する部分放電検出装置に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to partial discharge detection for detecting partial discharge that occurs inside an electrical device whose main body is housed in a container, such as an oil-filled transformer. It is related to the device.

[従来の技術] 第2図は電気機器例えば油入り変圧器に適用されている
従来の部分放電検出装置のブロック図であり、図におい
て(1)はタンク、(2)、 (3)はこのタンク(1
)内に収納された変圧器のそれぞれ巻線、鉄心であって
、電気機器本体を構成する。(4)はこの電気機器本体
と共にタンク(1)に収納された絶縁油、(5a〉はタ
ンク(1〉の上部に設けられた高圧ブッシング、(5b
)はタンク(1)の側壁に設けられたブッシングであっ
で、その一端がタンク(1)内の接地線(6a)によっ
て巻線(2)に接続されかつその他端がタンク(1)外
の接地線(6b)に接続されている。(7)はこのタン
ク外接地線(6b)に接続され、巻線(2)等の部分放
電が発生した際タンク外接地(6a)に流れる電気パル
ス例えばパルス電流を検出する電気パルス検出器、(8
)はこの電気パルス検出器(7〉の出力により部分放電
の大きさを測定する放電レベル測定器、(9a)〜(9
b)はタンク(1)の互に異る位置に取り付けられ、部
分放電の際発生する音響パルス例えば超音波パルスを検
出するための複数個の音響パルス検出器、(10)は部
分放電が発生してから各音響パルス検出器(9a)〜(
9b〉に音響パルスが到達するまでの遅延時間を測定す
る遅延時間測定器、(11)はこの遅延時間測定器(1
0)の出力である複数個の遅延時間を用いて部分放電発
生位置を演算する演算装置、(12)は部分放電の大き
さを表わす放電レベル測定器出力と、部分放電発生位置
を表わす演算装置出力とを用いて電気機器の異常を標定
し、警報および演算結果を出力する出力装置である。な
お、図中のブロック間を結ぶ実線は信号の経路を示し、
その矢印は信号の流れを示す。第3図は第2図に示した
従来の部分放電検出装置の動作を説明するための各部の
波形図である。
[Prior Art] Fig. 2 is a block diagram of a conventional partial discharge detection device applied to electrical equipment such as oil-filled transformers. Tank (1
) are the windings and core of the transformer housed in the transformer, and constitute the main body of the electrical equipment. (4) is the insulating oil stored in the tank (1) together with the main body of the electrical equipment, (5a) is the high pressure bushing installed at the top of the tank (1), (5b
) is a bushing provided on the side wall of the tank (1), one end of which is connected to the winding (2) by the ground wire (6a) inside the tank (1), and the other end is connected to the winding (2) by the ground wire (6a) inside the tank (1). It is connected to the ground wire (6b). (7) is an electric pulse detector that is connected to the tank external grounding wire (6b) and detects an electric pulse, such as a pulse current, flowing to the tank external grounding (6a) when a partial discharge occurs in the winding (2), etc.; (8
) is a discharge level measuring device (9a) to (9) that measures the magnitude of partial discharge based on the output of this electric pulse detector (7).
b) a plurality of acoustic pulse detectors installed at different positions in the tank (1) for detecting acoustic pulses, such as ultrasonic pulses, generated when partial discharge occurs; After that, each acoustic pulse detector (9a) to (
9b〉, a delay time measuring device (11) measures the delay time until the acoustic pulse arrives at
(12) is an arithmetic device that calculates the partial discharge occurrence position using a plurality of delay times which are the outputs of 0), and (12) is an arithmetic device that shows the discharge level measuring device output that represents the magnitude of the partial discharge and the partial discharge occurrence position. This is an output device that uses the output to locate abnormalities in electrical equipment and outputs alarms and calculation results. In addition, the solid lines connecting blocks in the figure indicate the signal path.
The arrows indicate the signal flow. FIG. 3 is a waveform diagram of each part for explaining the operation of the conventional partial discharge detection device shown in FIG. 2.

従来の部分放電検出装置は上記のように構成され、タン
ク(1)内の巻線(2)で部分放電が発生した場合、そ
れに伴って微小パルス電流と超音波パルスが発生する。
The conventional partial discharge detection device is configured as described above, and when a partial discharge occurs in the winding (2) in the tank (1), a minute pulse current and an ultrasonic pulse are generated accordingly.

この微小パルス電流は、その波形が第3図(八)に示さ
れ、巻線(2)からタンク内接地線(6a)、ブッシン
グ(5b)およびタンク外接地線(6b)を経て大地へ
流出する。このパルス電流はタンク外接地線(6a〉に
接続されている電気パルス検出器(7)で検出され、そ
の内部で波形整形されて第3図(b)に示すような電気
パルス信号になる。
The waveform of this minute pulse current is shown in Figure 3 (8), and flows out from the winding (2) to the earth via the tank internal grounding wire (6a), the bushing (5b), and the tank external grounding wire (6b). do. This pulse current is detected by an electric pulse detector (7) connected to the tank external ground line (6a), and is internally waveform-shaped into an electric pulse signal as shown in FIG. 3(b).

この電気パルス信号の波高値が予め設定されている基準
レベルを超えた場合、遅延時間測定器(10)へ遅延時
間測定開始指令を出す。これと同時に電気パルス検出器
(7)から放電の大きさを表わす信号が放電レベル測定
器(8)に入力され、そこで波高値が測定され、この値
が部分放電の大きさとして出力装置(12)に出力され
る。
When the peak value of this electric pulse signal exceeds a preset reference level, a delay time measurement start command is issued to the delay time measuring device (10). At the same time, a signal representing the magnitude of the discharge is input from the electric pulse detector (7) to the discharge level measuring device (8), where the peak value is measured, and this value is outputted as the magnitude of the partial discharge by the output device (12). ) is output.

一方、部分放電時に発生した超音波パルスはタンク(1
)内の絶縁油(4)を媒体として伝播し、タンク壁の互
に異なる位置に取り付けられた複数個の音響パルス検出
器(9a)〜(9c)のそれぞれに、部分放電発生時か
ら異った遅れ時間で達し、検出される。これらの音響パ
ルス検出器(9a)〜(9c)では油入変圧器の定常的
な励磁振動等の低周波成分の音響信号やタンク壁に雨と
か砂れき等が当って発生する音響ノズルは除去され、第
3図(C) 、 (E) 、 (G)に示すような放電
音のみが抽出される。更に、これらの抽出された音響信
号は予め設定されている基準値と比較され、基準値を超
過した場合には第3図(D)、(F)、(■)に示すよ
うな電気パルス信号を出力する6遅延時間測定器(10
)は上述したように電気パルス検出器(7)より入力さ
れた遅延時間測定開始指令により内部カウンタ回路が起
動されてカウントしている。そこに音響パルス検出器(
9a)〜(9c)から音響信号すなわち第3図(D) 
、 (F) 、 (H)が入力されることによりそれぞ
れのカウンタ回路は停止され、部分放電発生時点より音
響パルス検出器(9a)〜(9b〉が音響信号を検出す
るまでの音響信号遅延時間(ta) 、 (tb) 、
 (tc)が測定される。この音響信号遅延時間(ta
) 、 (tb) 、 (tc)は演算装置(11)に
入力される。ここでは音響信号遅延時間(ta) 。
On the other hand, the ultrasonic pulse generated during partial discharge is transmitted to the tank (1
) in the insulating oil (4) as a medium, and each of the plurality of acoustic pulse detectors (9a) to (9c) installed at different positions on the tank wall receives a different signal from the time of occurrence of the partial discharge. reached and detected with a delay time. These acoustic pulse detectors (9a) to (9c) remove low-frequency component acoustic signals such as steady excitation vibrations of oil-immersed transformers and acoustic nozzles generated by rain or sand particles hitting the tank wall. , only the discharge sounds shown in FIGS. 3(C), (E), and (G) are extracted. Furthermore, these extracted acoustic signals are compared with a preset reference value, and if the reference value is exceeded, an electric pulse signal as shown in FIGS. 3(D), (F), and (■) is generated. 6 delay time measuring instruments (10
), the internal counter circuit is started and counted by the delay time measurement start command inputted from the electric pulse detector (7) as described above. There is an acoustic pulse detector (
Acoustic signals from 9a) to (9c), ie, FIG. 3(D)
, (F), and (H) are input, each counter circuit is stopped, and the acoustic signal delay time from the time when partial discharge occurs until the acoustic pulse detectors (9a) to (9b) detect the acoustic signal. (ta), (tb),
(tc) is measured. This acoustic signal delay time (ta
), (tb), and (tc) are input to the arithmetic unit (11). Here, the acoustic signal delay time (ta).

(tb) 、 (tc)よりタンク(1〉内部で部分放
電が発生したか否か判定し、もし内部で発生したと判定
した場合は、下記の条件式の連立方程式(式の〉より発
生位置が求められる。
(tb) and (tc) to determine whether or not a partial discharge has occurred inside the tank (1). If it is determined that it has occurred inside, the occurrence position can be determined from the simultaneous equations of the following conditional expressions (formula). is required.

ここで、(Xo、3’o、zo)は部分放電発生位置の
座標点、(xa、ya、za) 、(xb、yb、zb
) 、(xc、yc、zc)はそれぞれ音響パルス検出
器(9a)〜(9c)のタンク壁への取付位置を示す座
標点、■は音響信号の媒体中における伝播速度、(ta
) 、 (tb) 、 (tc)は遅延時間測定器(1
0)によって測定されたそれぞれの音響信号遅延時間を
示すにのようにして求められた位置は出力装置(12)
に入力される。出力装置(12)では放電レベル測定器
(8)より入力された部分放電の大きさより油入変圧器
の異常を判定し。警報を出力する。また、部分放電の大
きさおよび演算装置(11)の演算結果すなわち部分放
電発生位置等を表示あるいはプリントする。
Here, (Xo, 3'o, zo) is the coordinate point of the partial discharge occurrence position, (xa, ya, za), (xb, yb, zb
), (xc, yc, zc) are coordinate points indicating the mounting positions of the acoustic pulse detectors (9a) to (9c) on the tank wall, respectively, ■ is the propagation velocity of the acoustic signal in the medium, and (ta
), (tb), (tc) are delay time measuring instruments (1
0) The positions determined as shown in the figure indicate the respective acoustic signal delay times measured by the output device (12).
is input. The output device (12) determines whether there is an abnormality in the oil-immersed transformer based on the magnitude of partial discharge input from the discharge level measuring device (8). Outputs a warning. Further, the magnitude of the partial discharge and the calculation result of the calculation device (11), that is, the partial discharge occurrence position, etc. are displayed or printed.

[発明が解決しようとする課題] 上記のような従来の部分放電検出装置では、タンク(1
)内部で発生した部分放電の大きさをタンク外接地It
! (6b)を通って大地へ流出するパルス電流の波高
値より検出するが、この方法では部分放電の発生場所や
パルス電流の大地への流出経路によっては部分放電時の
パルス電流の全てを検出できない場合があり、すなわち
部分放電の大きさを正確に検出できない場合があると云
う問題点があった。 この発明は、上述したような問題
点を解決するためになされたもので、タンク内部で発生
した部分放電の大きさをの発生場所に係わりなく正確に
検出できる部分放電検出装置を得ることを目的とする。
[Problem to be solved by the invention] In the conventional partial discharge detection device as described above, the tank (1
) The size of the partial discharge that occurred inside the tank is grounded It
! It is detected by the peak value of the pulse current flowing to the ground through (6b), but with this method, it is not possible to detect all of the pulse current during partial discharge depending on the location where the partial discharge occurs and the route of the pulse current flowing to the ground. There is a problem in that there are cases where the magnitude of partial discharge cannot be detected accurately. This invention was made in order to solve the above-mentioned problems, and its purpose is to provide a partial discharge detection device that can accurately detect the magnitude of partial discharge that occurs inside a tank, regardless of the location where it occurs. shall be.

[課題を解決するための手段] この発明に係る部分放電検出装置は、電気機器本体に接
続され、前記電気機器本体を収納するタンク内部で生じ
た部分放電によって発生される電気パルスを検出する電
気パルス検出器と、この電気パルス検出器の出力信号か
ら前記部分放電の大きさを測定する放電レベル測定器と
、前記タンクの異った位置に取り付けられ、前記部分放
電によって発生される音響パルスを検出する複数個の音
響パルス検出器と、前記電気パルス検出器の出力信号に
よって作動され、前記音響パルスの検出遅延時間を測定
する遅延時間検出器と前記タンク内の部分放電発生点か
ら前記電気パルスの検出端子での前記電気パルスの減衰
係数を部分放電発生位置での関数として予め求めて記憶
しておく係数記憶装置と、前記放電レベル測定器の出力
、前記遅延時間検出器の出力および前記係数記憶装置の
出力より前記部分放電の大きさを演算する演算装置と、
この演算装置の演算結果に基づいて電気機器の異常を判
断して警報を出力する出力装置を設けたものである。
[Means for Solving the Problems] A partial discharge detection device according to the present invention is an electric device that is connected to an electrical equipment main body and detects an electrical pulse generated by a partial discharge generated inside a tank housing the electrical equipment main body. a pulse detector; a discharge level measuring device for measuring the magnitude of the partial discharge from the output signal of the electric pulse detector; a plurality of acoustic pulse detectors for detecting a plurality of acoustic pulses; a delay time detector that is activated by the output signal of the electric pulse detector and measures the detection delay time of the acoustic pulse; and a plurality of acoustic pulse detectors for detecting the electric pulse from a partial discharge generation point in the tank. a coefficient storage device for predetermining and storing an attenuation coefficient of the electric pulse at the detection terminal as a function of the partial discharge occurrence position, an output of the discharge level measuring device, an output of the delay time detector, and the coefficient; a calculation device that calculates the magnitude of the partial discharge from the output of the storage device;
An output device is provided for determining abnormality in the electrical equipment based on the calculation result of the calculation device and outputting an alarm.

[作 用コ この発明においては、タンク内で発生した部分放電の大
きさは、従来装置と同様の方法で音響信号の遅延時間よ
り放電位置が求められ、この位置データと係数記憶装置
の減衰係数データとより演算される。
[Function] In this invention, the magnitude of the partial discharge generated in the tank is determined by determining the discharge position from the delay time of the acoustic signal in the same manner as in the conventional device, and by using this position data and the attenuation coefficient of the coefficient storage device. Calculated by data.

[実施例] 第1図はこの発明の一実施例を示すブロック図であり、
(1)〜(12)は上記従来装置と全く同一のものであ
る。(13)は部分放電によって発生した電気パルスが
電気パルス検出器(7)で検出された値まで減衰するタ
ンク内各場所パルス電流減衰係数を予め記憶しておく係
数記憶装置、(14)はタンク(1)の接地線である。
[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention.
(1) to (12) are completely the same as the conventional device described above. (13) is a coefficient storage device that stores in advance the pulse current attenuation coefficient at each location in the tank where the electric pulse generated by partial discharge is attenuated to the value detected by the electric pulse detector (7); (14) is the tank This is the grounding wire in (1).

なお、この発明では、放電レベル測定器(8)の出力側
は出力装置(12)ではなく演算装置(11)の接続さ
れ、係数記憶装置(13〉も演算装置(11)に接続さ
れている。
In addition, in this invention, the output side of the discharge level measuring device (8) is connected not to the output device (12) but to the arithmetic device (11), and the coefficient storage device (13>) is also connected to the arithmetic device (11). .

上記のように構成された部分放電検出装置においては、
タンク(1)内で部分放電が発生すると、従来装置と全
く同様に、パルス電流と超音波パルスが発生し、波高値
測定が行われると共に遅延時間測定が行われる。
In the partial discharge detection device configured as above,
When a partial discharge occurs in the tank (1), a pulse current and an ultrasonic pulse are generated, and the peak value and delay time are measured, just as in the conventional device.

タンク内部で発生する部分放電がタンク内接地線(6a
)を含まない巻線内で発生した場合には、パルス電流は
その一部がタンク(1)間の浮遊容量を介してタンク接
地、!! (14)より大地へ流出する。しかし、タン
ク内部で発生する部分放電がタンク内接地線(6a)を
含む巻線内で発生した場合には、殆ど全てのパルス電流
はタンク内接地線(6a)、ブッシング(5b)および
タンク外接地線(6b)を通って大地へ流出する。従っ
て、放電レベル測定器(8)は上述したように分流され
かつタンク外接地線(6b〉を通って大地へ流出するパ
ルス電流の波高値を測定することになり、タンク内各場
所毎のタンク間浮遊容量が異なるため、パルス電流の分
流割合も放電発生点によって異なってくる。すなわち、
電気パルス検出器(7)から検出されるパルス電流は放
電の発生点により異なった減衰係数の関係を持つたこと
になる。この放電発生点と減衰係数の関係は、タンク(
1)内の各場所に放電の大きさが既知である模擬パルス
電流を印加し、電気パルス検出器(7)によってパルス
電流を検出し、さらに放電レベル検出器(8)によりパ
ルス電流波高値を測定し、この波高値と上記の模擬パル
ス電流とを比較することにより求められる。この減衰係
数は係数記憶装置(13)に格納されている。電気パル
ス検出器(7)は検出されたパルス電流が予め設定され
ているレベルを超えると遅延時間測定器(10)に対し
、音響信号遅延時間測定開始指令を出力する6一方、音
響信号は媒体、例えば絶縁油(4)等を伝播し、異なっ
た時間経過後に音響パルス検出器(9a)〜(9c)で
検出され、パルス信号に変換され、遅延時間測定器(1
0)へ入力される。ここで前述の電気パルス検出器(7
)よりの音響信号遅延時間測定開始指令により音響信号
遅延時間を測定する。
The partial discharge that occurs inside the tank is connected to the tank internal grounding wire (6a
), a part of the pulse current flows through the stray capacitance between the tank (1) to the tank ground, ! ! (14) It flows out into the earth. However, if the partial discharge that occurs inside the tank occurs within the winding that includes the tank internal grounding wire (6a), almost all of the pulse current will flow through the tank internal grounding wire (6a), the bushing (5b), and the tank external connection. It flows out to the ground through the ground wire (6b). Therefore, the discharge level measuring device (8) measures the peak value of the pulse current that is shunted as described above and flows out to the ground through the tank external grounding wire (6b), Since the stray capacitance differs between the discharge points, the splitting ratio of the pulse current also differs depending on the point where the discharge occurs.In other words,
The pulse current detected by the electric pulse detector (7) has a different attenuation coefficient relationship depending on the point at which the discharge occurs. The relationship between this discharge point and the attenuation coefficient is the tank (
1) A simulated pulse current with a known discharge size is applied to each location in the area, the pulse current is detected by an electric pulse detector (7), and the peak value of the pulse current is detected by a discharge level detector (8). It is determined by measuring the peak value and comparing this peak value with the above-mentioned simulated pulse current. This damping coefficient is stored in a coefficient storage device (13). When the detected pulse current exceeds a preset level, the electric pulse detector (7) outputs an acoustic signal delay time measurement start command to the delay time measuring device (10).6 On the other hand, the acoustic signal is transmitted to the medium , for example, propagates through insulating oil (4), etc., is detected by acoustic pulse detectors (9a) to (9c) after different time passes, is converted into a pulse signal, and is detected by a delay time measuring device (1).
0). Here, the aforementioned electric pulse detector (7
) The acoustic signal delay time is measured by the acoustic signal delay time measurement start command.

その測定結果は演算装置! (11)へ入力される。演
算装置(11)では各音響信号遅延時間より放電発生位
置を算出し、この位置データ、演°算レベル測定器(8
)からパルス電流波高値および係数記憶装置(13)の
減衰係数から演算を行い、部分放電の大きさを高精度に
算出する。出力装置(12)は演算装置(11〉より入
力された部分放電の大きさより油入変圧器の異常を判定
し、警報信号を出力すると共に、部分放電の大きさ、そ
の他演算装置(11)の結果を表示あるいは記録する。
The measurement result is a calculation device! (11). The arithmetic unit (11) calculates the discharge occurrence position from each acoustic signal delay time, and uses this position data and the arithmetic level measuring device (8).
), the pulse current peak value and the attenuation coefficient of the coefficient storage device (13) are calculated, and the magnitude of the partial discharge is calculated with high precision. The output device (12) determines the abnormality of the oil-immersed transformer based on the magnitude of partial discharge inputted from the computing device (11), outputs an alarm signal, and outputs the magnitude of the partial discharge and other information from the computing device (11). Display or record results.

なお、上記実施例ではパルス電流を検出するための電気
パルス検出器(7)をタンク外接地線(6b)に接続し
たが、タンク接地線(14)やタンク(1〉内の鉄心(
3)のタンク外接地線(図示しない〉に接続しても良い
。また、高圧ブッシング(5a)の静電容量を介してパ
ルス電流を検出できるように電気パルス検出器(ア)を
接続しても良い。
In the above embodiment, the electric pulse detector (7) for detecting pulse current was connected to the tank external grounding wire (6b), but the tank grounding wire (14) and the iron core inside the tank (1)
3) may be connected to the tank external grounding wire (not shown).Also, an electric pulse detector (A) can be connected so that the pulse current can be detected via the capacitance of the high voltage bushing (5a). Also good.

[発明の効果] この発明は、以上説明したとおり、電気機器本体に接続
され、前記電気機器本体を収納するタンク内部で生じた
部分放電によって発生される電気パルスを検出する電気
パルス検出器と、この電気パルス検出器の出力信号から
前記部分放電の太きさを測定する放電レベル測定器と、
前記タンクの異った位置に取り付けられ、前記部分放電
によって発生される音響パルスを検出する複数個の音響
パルス検出器と、前記電気パルス検出器の出力信号によ
って作動され、前記音響パルスの検出遅延時間を測定す
る遅延時間検出器と前記タンク内の部分放電発生点から
前記電気パルスの検出端子での前記電気パルスの減衰係
数を部分放電発生位置での関数として予め求めて記憶し
ておく係数記憶装置と、前記放電レベル測定器の出力、
前記遅延時間検出器の出力および前記係数記憶装置の出
力より前記部分放電の大きさを演算する演算装置と、こ
の演算装置の演算結果に基づいて電気機器の異常を判断
して警報を出力する出力装置とを備えているため、従来
の装置のように放電発生位置により検出される放電の大
きさが左右されることなく、どの場所の放電発生に対し
ても、高精度で放電の大きさを検出できると云う効果を
奏する。
[Effects of the Invention] As explained above, the present invention includes an electric pulse detector that is connected to an electrical equipment main body and detects electrical pulses generated by partial discharge generated inside a tank that houses the electrical equipment main body; a discharge level measuring device that measures the thickness of the partial discharge from the output signal of the electric pulse detector;
a plurality of acoustic pulse detectors installed at different positions in the tank to detect acoustic pulses generated by the partial discharge; and a plurality of acoustic pulse detectors actuated by the output signal of the electric pulse detector and detecting the acoustic pulses with a delay. a delay time detector for measuring time; and a coefficient memory for predetermining and storing an attenuation coefficient of the electric pulse from the partial discharge generation point in the tank to the electric pulse detection terminal as a function of the partial discharge generation position. a device, and an output of the discharge level measuring device;
an arithmetic device that calculates the magnitude of the partial discharge from the output of the delay time detector and the output of the coefficient storage device; and an output that determines an abnormality in the electrical equipment based on the arithmetic result of the arithmetic device and outputs an alarm. Since the device is equipped with a device, the size of the discharge detected is not influenced by the location of the discharge unlike conventional devices, and the size of the discharge can be detected with high accuracy regardless of the location where the discharge occurs. It has the effect of being detectable.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例を示すブロック図、第2図
は従来の部分放電検出装置を示すブロック図、第3図は
第2図の装置の動作を説明するための各部の波形図であ
る。 図において、(1)はタンク、(2)は巻線、(3)は
鉄心、(7〉は電気パルス検出器、〈8)は放電レベル
測定器、(9a)〜(9c)は音響パルス検出器、(1
0)は遅延時間測定器、(11〉は演算装置、(12)
は出力装置、(13)は係数記憶装置である。 なお、各図中、同一符号は同一または相当部分を示す。 代  理  人     曾  我  道  照第 1 図 第 図 第 図
Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing a conventional partial discharge detection device, and Fig. 3 is a waveform diagram of each part to explain the operation of the device shown in Fig. 2. It is. In the figure, (1) is the tank, (2) is the winding, (3) is the iron core, (7> is the electric pulse detector, <8) is the discharge level measuring device, and (9a) to (9c) are the acoustic pulses. Detector, (1
0) is a delay time measuring device, (11> is an arithmetic unit, (12)
is an output device, and (13) is a coefficient storage device. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Zeng Wado Teru 1 Figure 1 Figure 1

Claims (1)

【特許請求の範囲】[Claims] 電気機器本体に接続され、前記電気機器本体を収納する
タンクの内部で生じた部分放電によつて発生される電気
パルスを検出する電気パルス検出器と、この電気パルス
検出器の出力信号から前記部分放電の大きさを測定する
放電レベル測定器と、前記タンクの異った位置に取り付
けられ、前記部分放電によって発生される音響パルスを
検出する複数個の音響パルス検出器と、前記電気パルス
検出器の出力信号によって作動され、前記音響パルスの
検出遅延時間を測定する遅延時間測定器と、前記タンク
内の部分放電発生点から前記電気パルスの検出端までの
前記電気パルスの減衰係数を部分放電発生位置での関数
として予め求めて記憶しておく係数記憶装置と、前記放
電レベル測定器の出力、前記遅延時間検出器の出力およ
び前記係数記憶装置の出力より前記部分放電の大きさを
演算する演算装置と、この演算装置の演算結果に基づい
て電気機器の異常を判断して警報を出力する出力装置と
を備えたことを特徴とする電気機器の部分放電検出装置
an electric pulse detector that is connected to an electrical equipment main body and detects electrical pulses generated by partial discharge generated inside a tank that houses the electrical equipment main body; a discharge level measuring device for measuring the magnitude of the discharge; a plurality of acoustic pulse detectors installed at different positions in the tank to detect acoustic pulses generated by the partial discharge; and the electric pulse detector. a delay time measuring device that is activated by an output signal of the acoustic pulse and measures the detection delay time of the acoustic pulse; and a delay time measuring device that measures the detection delay time of the acoustic pulse; a coefficient storage device that is determined in advance and stored as a function of the position; and an operation that calculates the magnitude of the partial discharge from the output of the discharge level measuring device, the output of the delay time detector, and the output of the coefficient storage device. 1. A partial discharge detection device for an electrical device, comprising: a device; and an output device that determines an abnormality in the electrical device based on the calculation result of the calculation device and outputs a warning.
JP21017289A 1989-08-16 1989-08-16 Partial discharge detector for electric apparatus Pending JPH0373873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21017289A JPH0373873A (en) 1989-08-16 1989-08-16 Partial discharge detector for electric apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21017289A JPH0373873A (en) 1989-08-16 1989-08-16 Partial discharge detector for electric apparatus

Publications (1)

Publication Number Publication Date
JPH0373873A true JPH0373873A (en) 1991-03-28

Family

ID=16584970

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21017289A Pending JPH0373873A (en) 1989-08-16 1989-08-16 Partial discharge detector for electric apparatus

Country Status (1)

Country Link
JP (1) JPH0373873A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103823168A (en) * 2014-03-10 2014-05-28 中国科学院电子学研究所 Circuit and device for detecting local discharge of gas insulated enclosed composite apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103823168A (en) * 2014-03-10 2014-05-28 中国科学院电子学研究所 Circuit and device for detecting local discharge of gas insulated enclosed composite apparatus

Similar Documents

Publication Publication Date Title
US5530366A (en) Acoustic optical system for partial discharge detection and location
US4095173A (en) Method and system for corona source location by acoustic signal detection
US6441622B1 (en) Method and apparatus for time domain reflectometry moisture sensing in various media
WO1999014562A1 (en) Ultrasound sensor for detecting the level of liquids
US7952362B2 (en) Device for measuring the loss factor
JP2008232973A (en) Device and method for determining partial discharge of electric apparatus
JP2004093565A (en) Filling level measuring apparatus
JPH0373873A (en) Partial discharge detector for electric apparatus
US4372151A (en) Automatic fault locating apparatus for a pressurized pipeline
JPS62194475A (en) Apparatus for monitoring internal discharge of stationary induction machinery
JPH04194762A (en) Device for monitoring partial discharge of electric apparatus
JPH03170878A (en) Partial discharge detector
JPS5944668A (en) Position marking device for partial electric discharge
JPS6069570A (en) Impulse corona detector of stationary electric apparatus
Darley Partial discharges within power transformers and the use of ultrasonic techniques in their location
Beltle et al. Investigations of in-oil methods for PD detection and vibration measurement
JPH03273174A (en) Monitoring devices for local electric discharge on stationary apparatus
JPH04283670A (en) Detecting device for partial discharge of high-voltage machinery and apparatus
JP3073124B2 (en) Airborne noise suppression device for partial discharge test
JPH026742A (en) Gas insulated apparatus
JPS60100061A (en) Apparatus for measuring partial discharge generating position of cable
JPH0225763A (en) Partial discharge detecting device
JPS5815167A (en) Electric discharge position measuring device of winding of electric apparatus
COENEN et al. CIGRE SC A2 & C4 JOINT COLLOQUIUM 2013
JPH0252992B2 (en)