JPS60196021A - Calling device using cable shielding layer as transmission line - Google Patents
Calling device using cable shielding layer as transmission lineInfo
- Publication number
- JPS60196021A JPS60196021A JP5196684A JP5196684A JPS60196021A JP S60196021 A JPS60196021 A JP S60196021A JP 5196684 A JP5196684 A JP 5196684A JP 5196684 A JP5196684 A JP 5196684A JP S60196021 A JPS60196021 A JP S60196021A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- shielding layer
- current
- underground
- converter
- 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
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 9
- 238000004891 communication Methods 0.000 claims abstract description 22
- 230000005236 sound signal Effects 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/545—Audio/video application, e.g. interphone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5466—Systems for power line communications using three phases conductors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5483—Systems for power line communications using coupling circuits
- H04B2203/5487—Systems for power line communications using coupling circuits cables
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は通話装置に関する。[Detailed description of the invention] The present invention relates to a telephone communication device.
地中配電設備の工事・保守・運用を行う場合には、安全
の確保、業務の的確処理を図るため線路の開閉操作箇所
と工事施工箇所とは、お互い密に連絡をとりあう必要が
ある。When constructing, maintaining, and operating underground power distribution equipment, it is necessary to maintain close communication between the line opening/closing operation point and the construction site in order to ensure safety and ensure proper work processing.
連絡方法としては、人による直接伝達か、無線器等を利
用する方法があるが、連絡箇所が遠ざかったり、一方が
地下室であったりすると、的U(fな情報伝達が困難で
あり無線機においてはその電波が到達しなかったり、到
達しても雑音が多く聴聞できないため複数箇所に無線中
継の太市を配置したりしてq用がかかったりするという
欠点があった。There are two methods of communication: direct communication by a person or the use of radio equipment, etc. However, if the communication point is far away or one side is in a basement, it is difficult to communicate information to the target The problem was that the radio waves did not reach the station, or even if they did arrive, they were too noisy to be audible, so radio relay stations had to be placed in multiple locations, which required a lot of work.
本発明の目的は、かかる欠点を解消し地中配電系統にお
いて工事作業を行う時、特に作業現場が広がっている時
の作業者間の連絡用手段として好適に使用できる地中ケ
ーブル遮蔽層を伝送路とする保守運用業務の効率化を図
ることにあり、特に地中配電系統で地中ケーブルが布設
されている洞道内又はビルの谷間などで工事作業中、連
絡用無線機などでは電波が届かない所で好適に使用でき
るノイズを低減した地中ケーブル遮蔽層を伝送路とする
通話装置を提供することにある。It is an object of the present invention to provide an underground cable shielding layer that eliminates such drawbacks and can be suitably used as a means of communication between workers when carrying out construction work in an underground power distribution system, especially when the work site is spread out. The purpose is to improve the efficiency of maintenance and operation work for underground power distribution systems, especially when construction work is being carried out in tunnels or valleys between buildings where underground cables are installed in underground power distribution systems, and radio waves cannot be received by communication radios. It is an object of the present invention to provide a telephone communication device using an underground cable shielding layer as a transmission path with reduced noise and which can be suitably used in places where there is no noise.
以下本発明による通話装置の実施例を図面に基づき説明
する。Embodiments of a communication device according to the present invention will be described below based on the drawings.
第1図はケーブル配線による配電系体の一例を示す。主
電源ラインは変電所のフィーダーから多回路開閉器1を
介して複数の分岐電力ケーブル2に分岐され、キャヒネ
ノト3に導入される。キャビネット3はπ形分岐となっ
ていて、一端を需要家に、他端を他のキャビネット3に
分配する。FIG. 1 shows an example of a power distribution system using cable wiring. A main power line is branched from a feeder of a substation to a plurality of branch power cables 2 via a multi-circuit switch 1, and introduced into a cabinet 3. The cabinet 3 has a π-shaped branch, with one end distributed to the customer and the other end distributed to other cabinets 3.
一方電力ケーブルの遮蔽層は、多回路開閉器jやキャビ
名ノド3内で一括接続され、アース線4に接続されてい
る。このアース線に変流器(クランプCT)を介して送
受信装置が取りつけられる。On the other hand, the shielding layer of the power cable is connected all at once in the multi-circuit switch j and the cabinet throat 3, and is connected to the ground wire 4. A transmitting/receiving device is attached to this ground wire via a current transformer (clamp CT).
第2図に本発明通話装置の概略を図示した。FIG. 2 shows an outline of the telephone communication device of the present invention.
第2図に示すように本発明通話装置は、地中配電系統に
おiJる地中ケーブルの遮蔽層5を伝送路とし、送信側
でマイクロよりの音声をFlv’l変凋回路7でFM信
号に変調し、変調したFM信号を変換器8により電流信
号に変換し、該変換器8により信号電流として前記遮蔽
層5に注入し、受信+!1.11に伝送を行い、電流検
出器9で受信し、受信した信号電流のFMをFM復調回
路10によりii&+yIIL音声に変換し、スピーカ
ー11より出力するようになっている。第2図にて47
は接地抵抗を示す。As shown in FIG. 2, the communication device of the present invention uses the shielding layer 5 of the underground cable connected to the underground power distribution system as a transmission path, and on the transmitting side, the voice from the micro is converted into FM by the Flv'l conversion circuit 7. The modulated FM signal is converted into a current signal by a converter 8, which injects it into the shielding layer 5 as a signal current, and receives +! 1.11, is received by the current detector 9, and the FM of the received signal current is converted into ii&+yIIL sound by the FM demodulation circuit 10, which is output from the speaker 11. 47 in Figure 2
indicates ground resistance.
次に本発明通話装置の詳細を第3図に示すブロック図に
より説明する。Next, details of the telephone communication device of the present invention will be explained with reference to the block diagram shown in FIG.
第3図に示す例では同一構成の装置2台により通話を行
うものとし、いずれも電池を電源とした可搬式のものを
例示している。In the example shown in FIG. 3, it is assumed that two devices having the same configuration are used to make a telephone call, and both are portable devices that use batteries as power sources.
先ず送信例について説明するに、マイクロからの音声信
号を音声増幅回路〔過入力による波形ひずみを防止する
ため、自動レベル制御(ALC)回路をイ」げている〕
12により増幅する。First, to explain a transmission example, the audio signal from the micro is sent to an audio amplification circuit (an automatic level control (ALC) circuit is activated to prevent waveform distortion due to excessive input).
12.
増幅した音声信号をFM変変向回路7IiM信号に変調
する。I!IIち増幅した音声信号は周波数変調(FM
)回路13&こ入力し、発振回路14から出力したtU
送波を音声信号により変調する。The amplified audio signal is modulated into an FM switching circuit 7IiM signal. I! II.The amplified audio signal is frequency modulated (FM
) tU inputted to circuit 13& and outputted from oscillation circuit 14
Modulate the transmitted wave with an audio signal.
尚、搬送波は電波法の電波法第100条第1項第1号の
電線路に10kllz以」−の高周波電流を通ずる電信
、電話、その他通信設備については郵政大臣の許可を必
要とするため7.5ktlzとした。Furthermore, carrier waves must be approved by the Minister of Posts and Telecommunications for telegraphs, telephones, and other communications equipment that conduct high-frequency currents of 10 kllz or less on electrical lines as specified in Article 100, Paragraph 1, Item 1 of the Radio Law. .5 ktlz.
変調した信号は高周波を除去するため、ローパスフィル
ター(1−PF)15を通して電力増幅回路16に入力
する。電力増幅回路16に入力した信号を増幅し、変流
器(CT)8により地中ケーブル遮蔽層5へ注入する。The modulated signal is input to a power amplifier circuit 16 through a low pass filter (1-PF) 15 in order to remove high frequencies. The signal input to the power amplification circuit 16 is amplified and injected into the underground cable shielding layer 5 by a current transformer (CT) 8.
上記の如く音声信号をFM変調回路7でいったんFMに
変調し、しかる後にFM信号を信号電流としてCTによ
り遮蔽層へ注入して通話を行うようにしたのは次の理由
による。The reason why the voice signal is first modulated into FM by the FM modulation circuit 7 as described above, and then the FM signal is injected as a signal current into the shielding layer by CT to perform a telephone call is as follows.
マイクロに音声が入力すると3kllzバンドパスフイ
ルターにより30011z以下及び3kllz (30
00117、)以」−の帯域の音声をカットし、約30
0〜3000+17.の帯域における通話とし、他機器
Gこ障害を与えないようにすると共に、この音声信号を
増幅し、信号電流として地中ケーブル遮蔽層に注入して
通話を行うようにすると、地中ケーブル遮蔽層に信号電
流が通過中、音声帯域付近の商用周波数5011zの高
調波が信号電流に含まれることがある。このような高調
波が含まれた信号電流を受信側が受信した時には、高調
波成分が雑音として出力するため通話不可能の場所がを
律することがある7
この雑音対策には上記の如くいったん音声をFM変調し
、FM変調信号を信号電流としてCTより地中ケーブル
遮蔽層へ注入して通話を行う方式がよい。これにより音
声帯域付近の高調波の影響を受けずに送・受信が行える
ことになる。When audio is input to the micro, the 3kllz band pass filter will filter out sounds below 30011z and 3kllz (30
00117,) - cuts the audio in the band of approximately 30
0~3000+17. If the voice signal is amplified and injected into the underground cable shielding layer as a signal current to make the call, the underground cable shielding layer While the signal current is passing through, harmonics of the commercial frequency 5011z near the audio band may be included in the signal current. When the receiving side receives a signal current that contains such harmonics, the harmonic components are output as noise, which may make it impossible to make a call.7 To counter this noise, it is necessary to first turn off the voice as described above. A preferred method is to perform FM modulation and inject the FM modulated signal as a signal current into the underground cable shielding layer from the CT to make a call. This allows transmission and reception to be performed without being affected by harmonics near the voice band.
次に受信側について説明する。Next, the receiving side will be explained.
地中ケーブル遮蔽層5から電流検出器(CT)9により
受信した信号は低レベルのため信号増幅回路(過入力に
よる波形ひずみを防止するへLC回路をイ」けている。Since the signal received by the current detector (CT) 9 from the underground cable shield layer 5 is at a low level, a signal amplification circuit (LC circuit is turned on to prevent waveform distortion due to excessive input) is installed.
)17に入力し増幅する。) 17 and amplified.
増幅した信号を高調波などのノイズを除去するためバン
ドパスフィルター(BPF)1Bを通し、−力をFM復
復調回路lへ、他方はミューテング回路19へ入力され
る。The amplified signal is passed through a band pass filter (BPF) 1B to remove noise such as harmonics, and the negative signal is input to the FM demodulation circuit l, and the other signal is input to the muting circuit 19.
FM復調回路10に入力された信号は音声信号に復調さ
れ信号増幅回路20で適正レベルまで増幅される。The signal input to the FM demodulation circuit 10 is demodulated into an audio signal and amplified to an appropriate level by the signal amplification circuit 20.
信号増幅回路20で増幅された音声信号には搬送成分が
含まれているためLPF21を通して除去する。Since the audio signal amplified by the signal amplification circuit 20 contains a carrier component, it is removed through the LPF 21.
LPF21を通した信号はアナログスイッチ22を通し
て電力増幅回路23に入力される。The signal passed through the LPF 21 is input to the power amplifier circuit 23 through the analog switch 22.
電力増幅回路23に入力された信号は増幅されスピーカ
IIから出力される。The signal input to the power amplification circuit 23 is amplified and output from the speaker II.
また、ミューティング回路19に入力された信号は、受
信側に変調信号がない場合、ノイズによるスピーカから
の不用な音を防止するためミューティング回路19でア
ナログスイッチのON、OFF信号として出力される。Furthermore, when there is no modulation signal on the receiving side, the signal input to the muting circuit 19 is outputted as an analog switch ON/OFF signal by the muting circuit 19 in order to prevent unnecessary sound from the speaker due to noise. .
上記における通話方式は、電池の消耗を大幅に少な(す
る利点があるためと装置の簡易さ等からブレストーク方
式とし相互に片側づつ送話するとよい。The above communication method is preferably a breath talk method, which has the advantage of significantly reducing battery consumption and the simplicity of the device, and allows one side to speak to each other.
本発明通話装置によれば地中配電系統において、工事作
業などを行う時に、特に作業現場か広範囲に広がってい
る時の作業者間の連絡用手段として好適に使用でき、地
中配電系統における保守、運用業務の効率化を図ること
ができる。According to the communication device of the present invention, it can be suitably used as a means of communication between workers when carrying out construction work in an underground power distribution system, especially when the work site is spread over a wide area. , it is possible to improve the efficiency of operational tasks.
本発明通話装置はノイズもなく、無線機では電波の届か
ないような区間でも自由に通話可能である。The telephone communication device of the present invention has no noise and can freely communicate even in areas where radio waves cannot reach with a wireless device.
本発明における前記した接地抵抗4は、接地状況により
異なるが、電流で信号を与えるので接地状況に関係なく
成る値の信号が得られ、受信増幅系により十分再生して
実用できることを確認することができた。更にC,Tを
用いたことにより変調器や検波器を不用とし安価な装置
を提供できると共に使用方法も電力設備に設けられたア
ース線(電線色グリーン)にクランプCTを挿入するだ
けで通信可能となり、誰もが簡便に使用でき、かつ活線
状況にあっても通信可能のものが得られた。The above-mentioned grounding resistor 4 in the present invention differs depending on the grounding situation, but since it provides a signal with a current, it is possible to obtain a signal with a value that is independent of the grounding situation, and it can be confirmed that it can be sufficiently reproduced by the receiving amplification system for practical use. did it. Furthermore, by using C and T, it is possible to provide a low-cost device that does not require a modulator or detector, and communication is possible by simply inserting a clamp CT into the ground wire (wire color green) installed in the power equipment. The result is something that anyone can use easily and that can communicate even when the line is live.
第1図はケーブル配線による配電系体の一例を示す系統
図、第2図は本発明通話装置の実施例を示す系統図、第
3図は本発明通話装置のブロック図の一例である。
5−−−m−−−地中ケーブルの遮蔽層6−−−−−−
− マイク
7、−−−−−−− F M変調回路
8−−−・変換器(C′r )
9−−−−− 電流検出(CT)
IQ−−−−F M復調回路
] 1−−−−−−−−スピーカ
特許出願人 東光電気株式会社
(を埋入弁理士 佐藤良博
第1図FIG. 1 is a system diagram showing an example of a power distribution system using cable wiring, FIG. 2 is a system diagram showing an embodiment of the communication device of the present invention, and FIG. 3 is an example of a block diagram of the communication device of the present invention. 5---m----Underground cable shielding layer 6------
- Microphone 7, ----- FM modulation circuit 8 --- Converter (C'r) 9 --- Current detection (CT) IQ --- FM demodulation circuit] 1- −−−−−−−Speaker patent applicant Toko Electric Co., Ltd. (Patent attorney Yoshihiro Sato Figure 1)
Claims (1)
を電流信号に変換し電カケーブルの遮蔽層へ注入する変
換器と、該変換器より受信した信号を音声信号に連関す
るFM復凋回路とを備えて成る電カケーブル遮蔽層を伝
送路とする通話装置。A modulation circuit that FM modulates an audio signal, a converter that converts the modulated FM signal into a current signal and injects it into the shielding layer of the power cable, and an FM recovery circuit that links the signal received from the converter to the audio signal. A communication device that uses a power cable shielding layer as a transmission path, comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5196684A JPS60196021A (en) | 1984-03-17 | 1984-03-17 | Calling device using cable shielding layer as transmission line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5196684A JPS60196021A (en) | 1984-03-17 | 1984-03-17 | Calling device using cable shielding layer as transmission line |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60196021A true JPS60196021A (en) | 1985-10-04 |
Family
ID=12901607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5196684A Pending JPS60196021A (en) | 1984-03-17 | 1984-03-17 | Calling device using cable shielding layer as transmission line |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60196021A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995026068A1 (en) * | 1994-03-21 | 1995-09-28 | Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co. Kg | Data transmission device in power supply cable networks |
EP0889602A2 (en) * | 1997-07-03 | 1999-01-07 | OBAG, Energieversorgung Ostbayern AG | Data transmission system for transmission of data on at least one power cable |
JP6870754B1 (en) * | 2020-01-15 | 2021-05-12 | 住友電気工業株式会社 | Communication system and communication equipment |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51147107A (en) * | 1975-06-11 | 1976-12-17 | Toyo Commun Equip Co Ltd | Electromagnetic communication method using open magnetic coupler |
JPS57194641A (en) * | 1981-05-27 | 1982-11-30 | Dainichi Nippon Cables Ltd | Communicating method using underground cable line |
-
1984
- 1984-03-17 JP JP5196684A patent/JPS60196021A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51147107A (en) * | 1975-06-11 | 1976-12-17 | Toyo Commun Equip Co Ltd | Electromagnetic communication method using open magnetic coupler |
JPS57194641A (en) * | 1981-05-27 | 1982-11-30 | Dainichi Nippon Cables Ltd | Communicating method using underground cable line |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995026068A1 (en) * | 1994-03-21 | 1995-09-28 | Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co. Kg | Data transmission device in power supply cable networks |
EP0889602A2 (en) * | 1997-07-03 | 1999-01-07 | OBAG, Energieversorgung Ostbayern AG | Data transmission system for transmission of data on at least one power cable |
EP0889602A3 (en) * | 1997-07-03 | 1999-10-20 | OBAG, Energieversorgung Ostbayern AG | Data transmission system for transmission of data on at least one power cable |
JP6870754B1 (en) * | 2020-01-15 | 2021-05-12 | 住友電気工業株式会社 | Communication system and communication equipment |
WO2021145040A1 (en) * | 2020-01-15 | 2021-07-22 | 住友電気工業株式会社 | Communication system and communication device |
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