JPS6154294B2 - - Google Patents
Info
- Publication number
- JPS6154294B2 JPS6154294B2 JP54036943A JP3694379A JPS6154294B2 JP S6154294 B2 JPS6154294 B2 JP S6154294B2 JP 54036943 A JP54036943 A JP 54036943A JP 3694379 A JP3694379 A JP 3694379A JP S6154294 B2 JPS6154294 B2 JP S6154294B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- distribution line
- line
- signal transmission
- zero
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
-
- 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
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
- H04B2203/542—Methods of transmitting or receiving signals via power distribution lines using zero crossing information
-
- 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
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)
Description
【発明の詳細な説明】
本発明は、配電線路を信号伝送路として利用す
る信号伝送方式に係り、特に小形の装置で安定に
信号伝送するに好適な信号伝送方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal transmission method using a power distribution line as a signal transmission path, and particularly to a signal transmission method suitable for stably transmitting signals with a small device.
配電線路を信号伝送路として利用する信号伝送
方式は、例えば第１図のように構成され、配電線
４の変電所側Ａに中央装置１、線路末端側Ｂに端
末装置２を設け、中央装置１から端末装置２に呼
出信号を送る。端末装置２はこれに応答し、各種
の信号１１を送り返す。中央装置１が端末装置２
を呼び出す信号３は、例えば、配電線の商用周波
数（50サイクル又は60サイクル）に、その周波数
の数倍の周波数の信号を重畳したものであり、受
信回路５で信号を解読し、端末装置２が応答す
る。端末装置２は例えば線路の電流、電圧につい
ての情報６を取り込みこれを返送するように構成
されており、入力変換回路７を経て入力を２進コ
ード等に変換するコード変換回路８でコード化
し、コード化した信号を１ビツトずつ（例えば
20，２１…の値に対応するビツト）順次送り出す
直列変換回路９で、コード化信号を決められた速
度で１ビツトづつ出力する。この信号は変調回路
１０で所定の変調を行なわれ例えば、専用回線１
１に乗せられて中央装置に返送される。 A signal transmission system that uses a distribution line as a signal transmission path is configured, for example, as shown in FIG. 1 sends a calling signal to the terminal device 2. In response, the terminal device 2 sends back various signals 11. Central device 1 is terminal device 2
The signal 3 for calling is, for example, a signal with a frequency several times that of the commercial frequency (50 cycles or 60 cycles) of the power distribution line superimposed on the commercial frequency (50 cycles or 60 cycles). responds. The terminal device 2 is configured to take in information 6 about the current and voltage of the line, for example, and send it back.The terminal device 2 passes through an input conversion circuit 7 and encodes it in a code conversion circuit 8 that converts the input into a binary code or the like. Coded signals bit by bit (for example,
The serial conversion circuit 9 outputs the coded signal bit by bit at a predetermined speed . This signal is subjected to predetermined modulation in the modulation circuit 10, and, for example, the dedicated line 1
1 and sent back to the central unit.
ここで、返送信号路に配電線を用いず専用回線
１１を利用する理由は、配電線４の伝送特性か
ら、高い周波数は伝送ロスが大きく、一方比較的
低い周波数を乗せる場合、配電線路全体を信号成
分で揺するため大きい伝送エネルギーを必要と
し、小形の端末装置２では難しいためである。こ
のため専用回線１１を別に設け伝送路とするが、
端末装置２を各線路の端末に用いると、専用回線
を設けることは経済的でなく、改善が望まれてい
る。 Here, the reason why the dedicated line 11 is used instead of the power distribution line for the return signal path is that due to the transmission characteristics of the power distribution line 4, high frequencies have a large transmission loss, whereas when carrying relatively low frequencies, the entire power distribution line is This is because the signal component oscillates, which requires a large amount of transmission energy, which is difficult for a small terminal device 2. For this purpose, a separate dedicated line 11 is provided as a transmission line, but
If the terminal device 2 is used as a terminal for each line, it is not economical to provide a dedicated line, and improvements are desired.
本発明の目的は、配電線路そのものを返送信号
路として利用することで、小型の装置で安定に信
号伝送することのできる信号伝送方式を提供する
にある。 An object of the present invention is to provide a signal transmission system that can stably transmit signals with a small device by using the power distribution line itself as a return signal path.
本発明では、コンデンサを介して三相に線路の
一線を伝送信号に従つて接地することにより、微
少な地絡電流を配電線路の一線と大地により構成
される回路に流し、変電所側ではそのバスに接続
した例えば接地変圧器を利用して前記の微少な地
絡電流による零相電圧を検出したものである。 In the present invention, by grounding one line of the three-phase line via a capacitor according to the transmission signal, a minute ground fault current flows through a circuit consisting of one line of the distribution line and the ground, and the substation side The zero-sequence voltage caused by the minute ground fault current is detected using, for example, a grounding transformer connected to the bus.
第２図において、変電所には変圧器２５の他、
バス１３と地絡事故保護のための零相電圧検出用
の接地変圧器１４が設けられている。３相の各配
電線路（フイーダ）４は線路対地容量１５，１８
（零相インピーダンス）をもつている。３０は、
いわゆる柱上変圧器であり、端末装置２は柱上変
圧器を塔載している電柱上に設置される。本願発
明では中央装置から柱上変圧器までの高圧配電線
路を利用して信号伝送するものであるが、さらに
は柱上変圧器から低圧配電線路を介して各家庭と
の間に第２の信号伝送路が設置されて、各家庭の
電気やガス等の検針結果を中央装置１に伝送する
ことにも利用できる。中央装置から柱上変圧器ま
での高圧配電線路のみを利用する信号伝送は、配
電線路管理の目的に利用されることが多い。つま
り、柱上変圧器上の区分開閉器を中央装置から計
画的に開閉制御し、あるいは系統事故発生時の停
電区間を最小とし停電時間を最短とするために使
用されることが多い。なお、１４は接地変圧器で
あり、バス１３には配電系統保護の目的ですでに
配置されている。ここで、本願発明で利用される
接地変圧器１４は図示のように中性線が接地され
ているので信号伝送に使用する高圧配電線の一線
と大地間には接地変圧器１４の一相で定まる電位
があり、これが信号伝送用のエネルギー源とな
る。 In Fig. 2, the substation includes a transformer 25 as well as
A bus 13 and a grounding transformer 14 for detecting zero-phase voltage to protect against ground faults are provided. Each three-phase distribution line (feeder) 4 has a line-to-ground capacity of 15, 18
(zero-sequence impedance). 30 is
This is a so-called pole-mounted transformer, and the terminal device 2 is installed on a utility pole on which the pole-mounted transformer is mounted. In the present invention, signals are transmitted using high-voltage distribution lines from the central equipment to the pole transformers, but a second signal is also transmitted from the pole transformers to each home via the low-voltage distribution lines. A transmission line is installed and can also be used to transmit meter reading results for electricity, gas, etc. in each household to the central device 1. Signal transmission using only high-voltage distribution lines from central equipment to pole-mounted transformers is often used for the purpose of distribution line management. In other words, it is often used to control the planned opening and closing of sectional switches on pole transformers from a central device, or to minimize the power outage section and shorten the power outage time when a system fault occurs. Note that 14 is a grounding transformer, which is already placed on the bus 13 for the purpose of protecting the power distribution system. Here, since the neutral wire of the grounding transformer 14 used in the present invention is grounded as shown in the figure, one phase of the grounding transformer 14 is connected between one line of the high-voltage distribution line used for signal transmission and the ground. There is a fixed potential, which is the energy source for signal transmission.
本発明では、高圧配電線の一線と大地間にコン
デンサ１２とスイツチ１９の直列回路を設け、端
末装置２からの制御信号でスイツチ１９を開閉制
御する。なお、スイツチ１９は機械的スイツチの
他にサイリスタ等の電気弁も使用できる。また、
コンデンサ１２とスイツチ１９の直列回路は、一
線と大地間に直接設けられることとしてもよい
が、等価回路として示したときに配電線と大地間
に直列に接続されていれば良い。 In the present invention, a series circuit of a capacitor 12 and a switch 19 is provided between a high-voltage distribution line and the ground, and the switch 19 is controlled to open and close by a control signal from the terminal device 2. In addition to the mechanical switch, an electric valve such as a thyristor can also be used as the switch 19. Also,
The series circuit of the capacitor 12 and the switch 19 may be provided directly between a line and the ground, but it is sufficient if it is connected in series between the distribution line and the ground when shown as an equivalent circuit.
このように構成するときの、本発明の原理説明
を行なう。まず、全フイーダの線路対地容量１５
〜１８の零相インピーダンスをZ0Aとし、端末で
接地するコンデンサの容量をZ0Bとし、線路の三
相の相電圧をＶとすると、スイツチ１９が閉路す
ると、ほぼ
Ｚ０Ａ×Ｖ／Ｚ０Ａ＋Ｚ０Ｂ
に比例した零相電圧を接地変圧器１４のブローク
ンデルタ回路に出力する。この現象は１線地絡時
に周知の現象である。 The principle of the present invention when configured in this way will be explained. First, the line-to-ground capacity of all feeders is 15
If the zero-sequence impedance of ~18 is Z 0 A, the capacitance of the capacitor grounded at the terminal is Z 0 B, and the phase voltage of the three phases of the line is V, then when switch 19 is closed, approximately Z 0 A×V/ A zero-sequence voltage proportional to Z 0 A+Z 0 B is output to the broken delta circuit of the grounding transformer 14 . This phenomenon is a well-known phenomenon when a one-line ground fault occurs.
このような現象を利用して、第３図のように端
末で各コード信号２０を伝送する場合、図示のよ
うに“１”スイツチ１９閉路、“０”をスイツチ
１９開路とすると、接地変圧器１４の出力は前述
のように、図示２１のように零相電圧として出力
する。これを中央装置で取り込み、波形２２の形
に復調し、受信波形とする。 When using such a phenomenon to transmit each code signal 20 at a terminal as shown in Figure 3, if "1" is the switch 19 closed and "0" is the switch 19 open as shown in the figure, the grounding transformer As described above, the output of 14 is output as a zero-phase voltage as shown in 21 in the figure. This is taken in by the central device and demodulated into the form of waveform 22, which is used as the received waveform.
第４図は中央装置１の受信回路例を示す。接地
変圧器１４の出力を整流回路２３で整流し、零相
電圧値に比例した直流電圧に変換し、波形整形回
路２４で元の波形２２に復調する。 FIG. 4 shows an example of the receiving circuit of the central device 1. The output of the grounding transformer 14 is rectified by a rectifier circuit 23, converted to a DC voltage proportional to the zero-sequence voltage value, and demodulated to the original waveform 22 by a waveform shaping circuit 24.
以上説明のように、本発明により信号伝送可能
であるが、さらに次のようにしても実現可能であ
る。つまり、本発明の原理は、発信信号として配
電線をコンデンサを通して１線地絡現象を起こ
し、この時に発生する対称座標法による零相回路
の変化に注目したものである。このことから、人
工的に発信する１線地絡時の零相電流を検出する
方式でも、同様の伝送効果が得られることは言う
までもない。変電所には配電線路の零相電流を検
出する零相CTも設置されているから、新たな装
置を追加設置する必要がなく、特に、零相CTは
接地変圧器に比べ小形化できる利点がある。 As explained above, signal transmission is possible according to the present invention, but it can also be realized in the following manner. That is, the principle of the present invention is to cause a one-line ground fault phenomenon through a capacitor in a distribution line as a transmission signal, and to pay attention to the change in the zero-phase circuit according to the symmetric coordinate method that occurs at this time. From this, it goes without saying that a similar transmission effect can be obtained by a method of detecting the artificially transmitted zero-sequence current at the time of a one-wire ground fault. Since the substation is also equipped with a zero-sequence CT that detects the zero-sequence current of the distribution line, there is no need to install any new equipment. be.
この本発明方式においては、コンデンサを介し
て接地する点に大きな意味が有り、接地電流によ
る発熱の問題が軽減され、装置の小形化ができ
る。つまり、本発明の場合、地絡電流による消費
電力Ｐは系統の相電圧をＥ、地絡電流Ig、ＥとIg
の位相差をθとするとＰ＝EIgcosθとなり、
IgcosθはＥに対してほぼ90゜進みとなり、Ｐは
最小となりうる。このため接地用コンデンサでの
発熱は殆ど無く、小型化が可能である。 In this method of the present invention, grounding via a capacitor is of great significance, the problem of heat generation due to ground current is alleviated, and the device can be made more compact. In other words, in the case of the present invention, the power consumption P due to ground fault current is the phase voltage of the grid E, the ground fault current Ig, and E and Ig
If the phase difference of is θ, then P=EIgcosθ,
Igcos θ leads E by approximately 90°, and P can be minimized. Therefore, there is almost no heat generation in the grounding capacitor, and miniaturization is possible.
なお、もし抵抗を介して設置するときには抵抗
における熱損失を生じ、このための放熱対策によ
り大型化を免れない。又、リアクトルとするとき
には配電線路の対地間コンデンサとの間で振動を
生じ、安定に信号伝送することが困難になる。コ
ンデンサを使用する本発明方式によれば、たとえ
ケーブル系統であつても、安定に高精度で信号伝
送出来ることが確認されている。 Note that if it is installed through a resistor, heat loss will occur in the resistor, and the size will inevitably increase due to heat dissipation measures for this purpose. Furthermore, when a reactor is used, vibration occurs between the power distribution line and the ground capacitor, making it difficult to stably transmit signals. It has been confirmed that according to the method of the present invention using a capacitor, signals can be transmitted stably and with high precision even in a cable system.
以上本発明によれば、小型の装置で安定に信号
伝送を行なえる配電線路信号伝送方式を得ること
ができる。 As described above, according to the present invention, it is possible to obtain a distribution line signal transmission system that allows stable signal transmission with a small device.
第１図は従来の配電線路信号伝送方式を示す
図、第２図は本発明になる配電線路信号伝送方式
を示す図、第３図は動作原理波形説明図、第４図
は中央装置の受信回路を示す図である。
１……中央装置、２……端末装置、４……配電
線、１２……接地インピーダンス、１３……バ
ス、１４……接地変圧器、１５〜１８……線路接
地容量、１９……スイツチ、２３……整流回路、
２４……波形整形回路。
Fig. 1 is a diagram showing the conventional distribution line signal transmission system, Fig. 2 is a diagram showing the distribution line signal transmission system according to the present invention, Fig. 3 is a diagram explaining the operating principle waveform, and Fig. 4 is a diagram showing the reception of the central equipment. It is a diagram showing a circuit. 1... Central device, 2... Terminal device, 4... Distribution line, 12... Grounding impedance, 13... Bus, 14... Grounding transformer, 15-18... Line grounding capacity, 19... Switch, 23... Rectifier circuit,
24...Waveform shaping circuit.
Claims (1)
端に伝送するものにおいて、前記三相高圧配電線
路の発信端の一線と大地間にコンデンサとスイツ
チ回路よりなる直列回路を設け、伝送信号にした
がつて前記スイツチを開閉して前記配電線路の零
相回路定数を変化させ、受信端でこの変化を信号
として取りだし、復調して元の信号をとりだすよ
うにしたことを特徴とする配電線路信号伝送方
式。 ２ 特許請求の範囲第１項記載の配電線路信号伝
送方式において、受信端の変化信号をとりだす装
置に接地変圧器を設けてこのブロークンデルタの
出力電圧を受信信号とすることを特徴とする配電
線路信号伝送方式。 ３ 特許請求の範囲第１項記載の配電線路信号伝
送方式において、受信端の変化信号をとりだす装
置に零相変流器を設けてこの零相変流器の出力電
流を受信信号とするこを特徴とする配電線路信号
伝送方式。[Claims] 1. In a three-phase high-voltage distribution line that transmits a signal at one end and transmits it to the other end, a series connection consisting of a capacitor and a switch circuit is connected between one line of the transmission end of the three-phase high-voltage distribution line and the ground. A circuit is provided, and the switch is opened and closed in accordance with the transmission signal to change the zero-phase circuit constant of the distribution line, and the receiving end extracts this change as a signal and demodulates it to extract the original signal. A distribution line signal transmission system featuring: 2. A distribution line signal transmission system according to claim 1, characterized in that a grounding transformer is provided in the device for extracting the changing signal at the receiving end, and the output voltage of this broken delta is used as the received signal. Signal transmission method. 3. In the distribution line signal transmission system according to claim 1, a zero-phase current transformer is provided in the device for extracting the changing signal at the receiving end, and the output current of the zero-phase current transformer is used as the received signal. Characteristic power distribution line signal transmission system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3694379A JPS55130243A (en) | 1979-03-30 | 1979-03-30 | Transmission system for distribution line signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3694379A JPS55130243A (en) | 1979-03-30 | 1979-03-30 | Transmission system for distribution line signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55130243A JPS55130243A (en) | 1980-10-08 |
| JPS6154294B2 true JPS6154294B2 (en) | 1986-11-21 |
Family
ID=12483823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3694379A Granted JPS55130243A (en) | 1979-03-30 | 1979-03-30 | Transmission system for distribution line signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55130243A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851630A (en) * | 1981-09-24 | 1983-03-26 | Hitachi Ltd | Distribution line transmitter |
| JPH0624328B2 (en) * | 1983-04-06 | 1994-03-30 | 株式会社日立製作所 | System frequency synchronous transmission system |
| CN109870626B (en) | 2019-03-22 | 2020-11-06 | 北京集创北方科技股份有限公司 | Open circuit detection method and LED display device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4978417A (en) * | 1972-12-01 | 1974-07-29 | ||
| JPS508040A (en) * | 1973-05-24 | 1975-01-28 | ||
| JPS5314441B2 (en) * | 1974-05-17 | 1978-05-17 |
-
1979
- 1979-03-30 JP JP3694379A patent/JPS55130243A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55130243A (en) | 1980-10-08 |
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