JP2748810B2 - Noise removal method in partial discharge measurement - Google Patents
Noise removal method in partial discharge measurementInfo
- Publication number
- JP2748810B2 JP2748810B2 JP4353740A JP35374092A JP2748810B2 JP 2748810 B2 JP2748810 B2 JP 2748810B2 JP 4353740 A JP4353740 A JP 4353740A JP 35374092 A JP35374092 A JP 35374092A JP 2748810 B2 JP2748810 B2 JP 2748810B2
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- JP
- Japan
- Prior art keywords
- noise
- partial discharge
- cable
- line
- signal
- 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.)
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- Testing Relating To Insulation (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は超高圧ＣＶケーブルの
絶縁診断に係り、特に電力ケーブルの部分放電測定の改
良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulation diagnosis of an ultra-high voltage CV cable, and more particularly to an improvement of a partial discharge measurement of a power cable.
【０００２】[0002]
【従来の技術】先行技術として、本件出願人が先に提案
している特願平４−１０２５４２号および特願平４−１
０５３０９号出願の概要について説明する。前者のも
のの一例である図８に示すものは、洞道内に布設された
測定線路１に設けられている絶縁接続部３からの部分放
電を検出する場合、絶縁接続部３に信号検出電極４を取
り付け、さらに測定線路１に並設されている他回線（起
誘導）ケーブル線路２の地上からの引き入れ口付近の洞
道内にもノイズ検出電極１３を取り付け、これらを信号
検出器（Ｚｓ）５とノイズ検出器（Ｚｎ）６にそれぞれ
接続し、ケーブルを伝播して侵入してくる地上からのノ
イズを信号用同期増幅器９およびノイズ用同期増幅器１
０を介してノイズ判別器１１で検出するのである。上記
信号検出器（Ｚｓ）５とノイズ検出器（Ｚｎ）６の両方
に同時にパルス信号が検出された場合、ノイズ判別器１
１でノイズと判別する。また、信号検出器（Ｚｓ）５の
方にのみパルス信号が検出された場合はノイズ判別器１
１で部分放電と判別するのである。2. Description of the Related Art As prior art, Japanese Patent Application Nos. 4-102542 and 4-1 proposed by the present applicant have been proposed.
The outline of the 05309 application will be described. FIG. 8, which is an example of the former, shows that when detecting a partial discharge from the insulated connecting portion 3 provided on the measurement line 1 laid in the sinus, the signal detecting electrode 4 is connected to the insulated connecting portion 3. A noise detection electrode 13 is also mounted in a sinus near the entrance of the other line (leading) cable line 2 from the ground, which is provided in parallel with the measurement line 1, and these are connected to the signal detector (Zs) 5. The noise detector 6 is connected to a noise detector (Zn) 6 to transmit noise from the ground which propagates through a cable and intrudes into the signal synchronous amplifier 9 and the noise synchronous amplifier 1.
The signal is detected by the noise discriminator 11 via 0. If a pulse signal is detected simultaneously by both the signal detector (Zs) 5 and the noise detector (Zn) 6, the noise discriminator 1
1 is determined as noise. If a pulse signal is detected only in the signal detector (Zs) 5, the noise discriminator 1
At 1, it is determined that the discharge is a partial discharge.
【０００３】前者の特願平４−１０２５４２号の図２
の例では、図９に示すように、測定線路１に設けられた
絶縁接続部３に信号検出電極４を取り付け、さらに他回
線（起誘導）ケーブル線路２の地上からの引き入れ口付
近の地上部にノイズ検出用アンテナ１４をセットして気
中端末７や架空線８から発生する気中コロナおよびその
他のノイズを検出する。図９の回路において、信号検出
器（Ｚｓ）５とノイズ検出器（Ｚｎ）６の両方にパルス
信号が同時に検出された場合はノイズ判別器１１におい
てノイズと判別し、信号検出器（Ｚｓ）５の一方からだ
けパルス信号が検出された場合はノイズ判別器１１にお
いて部分放電と判別するのである。FIG. 2 of the former Japanese Patent Application No. 4-102542.
In the example shown in FIG. 9, as shown in FIG. 9, a signal detection electrode 4 is attached to an insulated connection portion 3 provided on a measurement line 1, and furthermore, a terrestrial portion near the entrance of the other line (induction) cable line 2 from the ground. The antenna 14 for noise detection is set to detect airborne corona and other noise generated from the aerial terminal 7 and the overhead wire 8. In the circuit of FIG. 9, when a pulse signal is simultaneously detected by both the signal detector (Zs) 5 and the noise detector (Zn) 6 , the noise is determined by the noise determiner 11 as noise, and the signal detector (Zs) 5 is detected. When a pulse signal is detected from only one of the above, the noise discriminator 11 determines that the discharge is a partial discharge.
【０００４】後者の特願平４−１０５３０９号のもの
では、図１０に示すように、測定線路１の絶縁接続部３
から信号検出電極４を介して部分放電信号用検出器５に
より部分放電信号を検出すると同時に、ノイズ検出用ア
ンテナ１４から気中コロナおよび空間ノイズを検出す
る。ノイズ検出器６で検出したノイズ信号をゲート制御
信号としてノイズ除去部１７に出力し、絶縁接続部３か
ら検出された部分放電信号にゲートをかける。このよう
にして測定ケーブル１を伝播して部分放電信号検出器５
で検出された部分放電信号を気中コロナおよび空間ノイ
ズを除去して測定するものである。In the latter Japanese Patent Application No. 4-105309, as shown in FIG.
At the same time, the partial discharge signal is detected by the partial discharge signal detector 5 via the signal detection electrode 4, and the air corona and the spatial noise are detected from the noise detection antenna 14. The noise signal detected by the noise detector 6 is output to the noise removing unit 17 as a gate control signal, and the partial discharge signal detected from the insulating connection unit 3 is gated. In this way, the partial discharge signal detector 5 propagates through the measurement cable 1 and
The partial discharge signal detected in step (1) is measured by removing air corona and spatial noise.
【０００５】[0005]
【発明が解決しようとする課題】上述した先行技術，
およびに挙げた方法は、ある一定レベル以上のノイ
ズに対して判別または除去を行うため、気中コロナ等の
パルス性ノイズに対しては有効であるが、放送波やホワ
イトノイズ等のノイズがほぼ連続的に侵入した場合、常
時ノイズが発生していると判別してこれを除去してしま
うため、低頻度で発生した部分放電パルスそのものが除
去されてしまう虞がある。そこで、放送波やホワイトノ
イズ等の影響を避けようとすると、部分放電の検出精度
が悪くなってしまうという問題点がある。The prior art described above,
The methods described above and above are effective for noises such as airborne coronas because they discriminate or remove noises above a certain level, but noises such as broadcast waves and white noises are almost eliminated. In the case of continuous intrusion, since it is always determined that noise is generated and is removed, there is a possibility that the partial discharge pulse itself generated infrequently may be removed. Therefore, there is a problem that the detection accuracy of the partial discharge is deteriorated when trying to avoid the influence of a broadcast wave, white noise, or the like.
【０００６】また、上記，の場合には、測定線路１
から大きな部分放電信号が発生した場合、逆に測定ケー
ブル１が起誘導ケーブルとして作用し、他回路線路２に
部分放電信号が誘導し、ノイズ検出器６で検出され、ノ
イズ除去部１７のノイズゲートの動作で部分放電パルス
そのものの通過が阻止されてしまう虞がある。そこで、
起誘導ケーブル２を介して侵入してくる外部ノイズは測
定対象ケーブル１に大きなノイズ障害を与えず、また、
測定対象ケーブル１からの部分放電パルスも反対にノイ
ズ起誘導ケーブル２に大きな誘導障害を与えないように
することが望ましい。In the above cases, the measurement line 1
When a large partial discharge signal is generated, the measurement cable 1 acts as an inductive cable, the partial discharge signal is induced in the other circuit line 2, detected by the noise detector 6, and There is a risk that the passage of the partial discharge pulse itself will be blocked by the operation described above. Therefore,
External noise that enters through the induction cable 2 does not cause a large noise disturbance to the cable 1 to be measured.
On the contrary, it is desirable that the partial discharge pulse from the cable 1 to be measured does not cause a large induction disturbance in the noise-inducing cable 2.
【０００７】この発明はこのような点に鑑みてなされた
もので、起誘導ケーブル線路のノイズを減衰させて、そ
れによって測定ケーブル線路に誘導するノイズを減少さ
せ、また、逆にノイズゲート信号を取り込んでいる起誘
導ケーブルに測定線路からの部分放電パルスが誘導する
のを抑制して測定線路からの部分放電パルスによりノイ
ズゲートが動作するのを阻止させるようにし、確実な部
分放電信号の測定が可能なようにした。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and attenuates noise in an induction cable line, thereby reducing noise induced in a measurement cable line. Suppress the induction of the partial discharge pulse from the measurement line into the incoming induction cable, prevent the noise gate from operating due to the partial discharge pulse from the measurement line, and ensure the measurement of the partial discharge signal. Made possible.
【０００８】[0008]
【課題を解決するための手段】この発明は、地中に布設
されたケーブル線路の部分放電測定を行う場合、測定対
象ケーブル線路と並設されている起誘導ケーブル線路の
ノイズ侵入源付近に高周波鉄心を取り付け、ノイズ侵入
源と高周波鉄心の間にノイズ検出器を取り付け、得られ
たノイズでノイズ除去回路の制御を行うようにした部分
放電測定におけるノイズ除去法である。SUMMARY OF THE INVENTION According to the present invention, when a partial discharge measurement is performed on a cable line laid underground, a high-frequency wave is generated near a noise intrusion source of an inductive cable line juxtaposed with a cable line to be measured. This is a noise removal method in partial discharge measurement in which an iron core is attached, a noise detector is attached between a noise intrusion source and a high-frequency iron core, and a noise removal circuit is controlled by the obtained noise.
【０００９】[0009]
【作用】洞道内のノイズは地上からのケーブル引き入れ
口から侵入してくるものが殆どであるので、ケーブル引
き入れ口付近のケーブル部に高周波鉄心を取り付け、ケ
ーブル部の高周波インピーダンスを高めてノイズが洞道
内に侵入するのを抑制する。また、洞道内に引き入れた
起誘導ケーブルがある場合、引き入れ口付近のケーブル
部に高周波鉄心を取り付けてノイズの洞道内への侵入を
抑制するとともに、その高ノイズ側からノイズゲート信
号を取り込むようにした。また、鉄心で測定ケーブルか
らの部分放電パルスが逆に起誘導ケーブルに誘導してノ
イズゲートが誤動作するのを防止するのである。[Function] Since most of the noise in the cave intrudes from the cable entrance from the ground, a high-frequency iron core is attached to the cable near the cable entrance, and the high-frequency impedance of the cable is increased to reduce the noise. We restrain invasion in way. Also, if there is an inductive cable pulled into the cave, attach a high-frequency iron core to the cable near the entrance to prevent noise from entering the cave and take in the noise gate signal from the high noise side. did. Further, the partial discharge pulse from the measuring cable is prevented from being guided to the induction cable by the iron core, thereby preventing the noise gate from malfunctioning.
【００１０】[0010]
【実施例】以下、図面に基づいてこの発明の実施例を説
明する。図１は測定対象ケーブル線路と並設されている
起誘導ケーブル線路のノイズ侵入源付近に高周波鉄心を
取り付けてノイズ除去を行うようにした部分放電測定手
法を説明するための測定装置の概略構成図である。即
ち、大地１２の下に設けられた地下洞道に２本のモデル
ケーブル線路１，２を線路長３００ｍにわたり布設し
た。一方のケーブル線路１（以下、測定ケーブル線路と
いう）のほぼ中央部に模擬欠陥を入れた絶縁接続部３を
設け、この絶縁接続部３の絶縁筒の両端に信号検出電極
４および部分放電信号検出器５を取り付けた。他方のケ
ーブル線路２は起誘導ケーブルとして作用させるため測
定ケーブル線路１の絶縁接続部３から５０ｍ離れた位置
から地上に引き出した。なお、７はケーブル線路２の気
中終端部、８は気中リード線である。Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is installed side by side with the cable line to be measured
Install a high-frequency iron core near the noise
FIG. 2 is a schematic configuration diagram of a measuring device for explaining a partial discharge measuring method in which noise is removed by being attached . That is, two model cable lines 1 and 2 were laid in an underground cave provided under the ground 12 over a line length of 300 m. An insulation connection portion 3 having a simulated defect is provided substantially at the center of one of the cable lines 1 (hereinafter referred to as a measurement cable line), and a signal detection electrode 4 and a partial discharge signal detection are provided at both ends of an insulating cylinder of the insulation connection portion 3. The vessel 5 was attached. The other cable line 2 was pulled out to the ground from a position 50 m away from the insulated connection portion 3 of the measurement cable line 1 so as to function as an inductive cable. In addition, 7 is an aerial terminal part of the cable line 2, and 8 is an aerial lead wire.
【００１１】このようなケーブル線路において、初めに
他回路線路２に高周波鉄心を取り付けずに部分放電の測
定を試みた。部分放電検出感度を調べたところ、周波数
７．３ＭＨｚにおいて検出感度は図３に示すように約５
ｐＣであった。In such a cable line, an attempt was made to measure partial discharge without first attaching a high-frequency core to the other circuit line 2. When the partial discharge detection sensitivity was examined, at a frequency of 7.3 MHz, the detection sensitivity was about 5 as shown in FIG.
pC.
【００１２】次に、他回線（起誘導）ケーブル２の地上
引き出し口付近の洞道側に高周波鉄心１９を取り付けて
再度検出感度を調べた。その結果は図４に示す。Next, a high-frequency iron core 19 was attached to the sinus side near the ground outlet of the other circuit (leading) cable 2, and the detection sensitivity was examined again. The result is shown in FIG.
【００１３】高周波鉄心１９を取り付けたことによりノ
イズレベルは減少し、検出感度も約３ｐＣと向上した。
これは高周波鉄心１９を取り付けることによって、他回
線（起誘導）ケーブル線路２の高周波インピーダンスが
高くなり、高周波帯域のノイズレベルが減衰して減少
し、測定ケーブル線路１への誘導量が少なくなったため
である。By attaching the high-frequency iron core 19, the noise level was reduced, and the detection sensitivity was improved to about 3 pC.
This is because the high-frequency iron core 19 is attached, the high-frequency impedance of the other line (induction and induction) cable line 2 is increased, the noise level in the high-frequency band is attenuated and reduced, and the amount of induction to the measurement cable line 1 is reduced. It is.
【００１４】次に、測定ケーブル線路１に課電して部分
放電を検出した。図５に示すような大きな部分放電信号
Ｓが発生していた。Next, a voltage was applied to the measurement cable line 1 to detect a partial discharge. A large partial discharge signal S as shown in FIG. 5 was generated.
【００１５】次に、図２に示すようにこのモデルケーブ
ル線路１の他回線（起誘導）ケーブル線路２の地上から
の引き入れ口付近にノイズ検出用電極１３およびノイズ
検出器６を取り付けてノイズ除去を行った。この際にノ
イズ検出用電極１３の洞道内側に高周波鉄心１９を取り
付けた場合と取り付けない場合の比較を行った。Next, as shown in FIG. 2, a noise detection electrode 13 and a noise detector 6 are attached near the entrance of the other cable (lead-in) cable line 2 of the model cable line 1 from the ground to remove noise. Was done. At this time, a comparison was made between the case where the high-frequency iron core 19 was attached to the inside of the sinus of the noise detection electrode 13 and the case where it was not attached.
【００１６】初めに高周波鉄心１９を取り付けない状態
でノイズ検出を行った。測定ケーブル線路１に電圧を引
加すると、図６に示すように測定ケーブル線路１から発
生している部分放電がノイズとして検出されてしまった
ために、殆どの部分放電信号Ｓが除去されてしまった。
この原因は部分放電電荷量がかなり大きいため、また、
部分放電位置とノイズ検出用電極１３の位置が近いため
に他回線（起誘導）ケーブル線路２に誘導した部分放電
信号が十分に減衰せずにノイズとして検出されたためで
ある。First, noise detection was performed without attaching the high-frequency iron core 19. When a voltage was applied to the measurement cable line 1, most of the partial discharge signal S was removed because the partial discharge generated from the measurement cable line 1 was detected as noise as shown in FIG. .
This is because the partial discharge charge is quite large,
This is because the partial discharge signal guided to the other line (lead-in) cable line 2 was detected as noise without being sufficiently attenuated because the position of the partial discharge was close to the position of the noise detection electrode 13.
【００１７】そこで他回線（起誘導）ケーブル線路２に
高周波鉄心１９を取り付けて測定ケーブル線路１に電圧
を印加した。その結果を図７に示す。殆どの部分放電信
号Ｓは除去されずに部分放電が有ると正確に判別でき
た。Then, a high-frequency iron core 19 was attached to the other circuit (induction) cable line 2 and a voltage was applied to the measurement cable line 1. FIG. 7 shows the result. Most of the partial discharge signal S was not removed, and it could be accurately determined that there was a partial discharge.
【００１８】今回行ったモデル線路のように検出部付近
から他回線ケーブルが地上に引き込まれている場所は実
線路においても数多く存在するので、この手法によるノ
イズ除去は有効であると考えられる。洞道内布設ケーブ
ル線路は勿論のこと、管路布設ケーブル内マンホール部
にもこの手法は適用することができる。また、必ずしも
洞道内とは限らずノイズの起誘導ケーブルが特定するこ
とができ、そのノイズ源の方向が明らかな場合にはこの
手法は適用可能である。Since there are many places where the other line cable is pulled into the ground from the vicinity of the detection section, such as the model line performed this time, even on the actual line, it is considered that the noise removal by this method is effective. This method can be applied not only to the cable line laid in the tunnel, but also to the manhole portion in the cable laid in the conduit. In addition, a noise-inducing cable can be specified, not necessarily in a sinus, and this method can be applied when the direction of the noise source is clear.
【００１９】[0019]
【発明の効果】以上説明したとおり、この発明の部分放
電測定におけるノイズ除去法によれば、他回線ケーブル
線路のノイズ侵入源付近に高周波鉄心を取り付け、ノイ
ズ侵入源と高周波鉄心の間にノイズ検出器を取り付け、
得られたノイズでノイズ除去回路の制御を行うようにし
たことによって、洞道内に侵入してくるノイズの減衰に
よる部分放電信号の検出感度を向上させることができ
る。また、ノイズ（Ｎ）と部分放電信号（Ｓ）のＮ／Ｓ
比の高いノイズ検出を行うことによるより確実なノイズ
除去の制御信号を得ることが可能になり、部分放電測定
の精度を向上させることができる。As described above, according to the noise elimination method in the partial discharge measurement of the present invention, a high-frequency iron core is mounted near the noise intrusion source of the other cable line, and the noise is reduced.
Install a noise detector between the intrusion source and the high-frequency core,
Control the noise elimination circuit with the obtained noise.
As a result, the detection sensitivity of the partial discharge signal due to the attenuation of the noise that enters the sinus can be improved. Also, N / S of noise (N) and partial discharge signal (S)
By performing noise detection with a high ratio, a more reliable noise removal control signal can be obtained, and the accuracy of partial discharge measurement can be improved.
【図１】測定対象ケーブル線路と並設されている起誘導
ケーブル線路のノイズ侵入源付近に高周波鉄心を取り付
けてノイズ除去を行うようにした部分放電におけるノイ
ズ除去法を説明するための測定装置の概略構成図、FIG. 1 is an induction system juxtaposed with a cable line to be measured .
A high-frequency iron core is installed near the noise entry source of the cable line
Schematic configuration diagram of a measuring apparatus for explaining a noise removal method in partial discharge in which noise removal is performed
【図２】この発明の一実施例の部分放電におけるノイズ
除去法を説明するための測定装置の概略構成図、FIG. 2 is a schematic configuration diagram of a measuring device for explaining a noise removal method in partial discharge according to one embodiment of the present invention;
【図３】高周波鉄心を取付け前のノイズの波形図、FIG. 3 is a waveform diagram of noise before a high-frequency iron core is attached;
【図４】高周波鉄心を取付け後のノイズの波形図、FIG. 4 is a waveform diagram of noise after attaching a high-frequency iron core,
【図５】図１に示す回路で検出されたノイズの無い部分
放電信号の波形図、FIG. 5 is a waveform diagram of a noise-free partial discharge signal detected by the circuit shown in FIG. 1;
【図６】高周波鉄心を取付け前の部分放電信号の波形
図、FIG. 6 is a waveform diagram of a partial discharge signal before attaching a high-frequency iron core,
【図７】高周波鉄心を取付け後の部分放電信号の波形
図、FIG. 7 is a waveform diagram of a partial discharge signal after attaching a high-frequency iron core,
【図８】先行技術の部分放電測定装置の一例を示す構成
図、FIG. 8 is a configuration diagram showing an example of a prior art partial discharge measuring device;
【図９】先行技術の部分放電測定装置の他の例を示す構
成図、FIG. 9 is a configuration diagram showing another example of the prior art partial discharge measuring device;
【図１０】先行技術の部分放電測定装置の他の例を示す
構成図である。FIG. 10 is a configuration diagram showing another example of the prior art partial discharge measuring device.
１ 測定線路 ２ 他回路線路 ３ 絶縁接続部 ４ 信号検出電極 ５ 部分放電信号検出器 ６ ノイズ検出器 ９ 部分放電信号用同調増幅器 １０ ノイズ用同調増幅器 １１ ノイズ判別器 １２ 大地 １３ ノイズ検出電極 １４ ノイズ検出用アンテナ １５ 信号用検波器 １６ ノイズ用検波器 １７ ノイズ除去部 １８ モニター １９ 高周波鉄心 DESCRIPTION OF SYMBOLS 1 Measurement line 2 Other circuit line 3 Insulated connection part 4 Signal detection electrode 5 Partial discharge signal detector 6 Noise detector 9 Tuning amplifier for partial discharge signal 10 Tuning amplifier for noise 11 Noise discriminator 12 Ground 13 Noise detection electrode 14 Noise detection Antenna 15 signal detector 16 noise detector 17 noise remover 18 monitor 19 high-frequency iron core
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 ＨＥＮＲＹ Ｗ．ＯＴＴ著、松井孚夫 監訳 「実践ノイズ低減技法」 （昭53 −６−15 （株）日本技術経済センター 出版部発行 （ジャテック出版発売） ＰＰ．159−164 ──────────────────────────────────────────────────続 き Continued on the front page (56) References HENRY W. OTT, translated by Fusio Matsui, "Practical Noise Reduction Techniques" (Showa 53-6-15, published by Japan Technology Economic Center Publishing Co., Ltd. (released by Jatec Publishing) PP.159-164
Claims (1)
測定を行う場合、測定対象ケーブル線路と並設されてい
る起誘導ケーブル線路のノイズ侵入源付近に高周波鉄心
を取り付け、ノイズ侵入源と高周波鉄心の間にノイズ検
出器を取り付け、得られたノイズでノイズ除去回路の制
御を行うようにしたことを特徴とする部分放電測定にお
けるノイズ除去法。1. A case where the partial discharge measurement of laying the cable line in the ground, fitted with a high-frequency core in the vicinity of the noise invasion source of measured cable line and juxtaposed with that caused induction cable line, and noise intrusion source Noise detection between high frequency cores
Install the output unit and use the obtained noise to control the noise removal circuit.
A noise elimination method in partial discharge measurement, characterized in that the control is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4353740A JP2748810B2 (en) | 1992-12-15 | 1992-12-15 | Noise removal method in partial discharge measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4353740A JP2748810B2 (en) | 1992-12-15 | 1992-12-15 | Noise removal method in partial discharge measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06180340A JPH06180340A (en) | 1994-06-28 |
| JP2748810B2 true JP2748810B2 (en) | 1998-05-13 |
Family
ID=18432902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4353740A Expired - Fee Related JP2748810B2 (en) | 1992-12-15 | 1992-12-15 | Noise removal method in partial discharge measurement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2748810B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047302B (en) * | 2022-08-15 | 2022-12-30 | 国网江西省电力有限公司电力科学研究院 | Cable series resonance partial discharge detection system and method based on double transformers |
-
1992
- 1992-12-15 JP JP4353740A patent/JP2748810B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| ＨＥＮＲＹ Ｗ．ＯＴＴ著、松井孚夫監訳 「実践ノイズ低減技法」 （昭５３−６−１５ （株）日本技術経済センター出版部発行 （ジャテック出版発売） ＰＰ．１５９−１６４ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06180340A (en) | 1994-06-28 |
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