JP2903090B2 - Distribution line carrier signal receiver - Google Patents
Distribution line carrier signal receiverInfo
- Publication number
- JP2903090B2 JP2903090B2 JP1263627A JP26362789A JP2903090B2 JP 2903090 B2 JP2903090 B2 JP 2903090B2 JP 1263627 A JP1263627 A JP 1263627A JP 26362789 A JP26362789 A JP 26362789A JP 2903090 B2 JP2903090 B2 JP 2903090B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- phase
- detection
- output
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は配電線搬送信号受信装置に係り、特に、配電
線を信号伝送路として情報の授受を行うシステムにおい
て、配電線を伝送する搬送信号の受信装置として用いる
に好適な配電線搬送信号受信装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution line carrier signal receiving apparatus, and more particularly to a system for transmitting and receiving information using a distribution line as a signal transmission path. The present invention relates to a distribution line carrier signal receiving device suitable for use as a receiving device.
配電線を信号伝送路として情報の授受を行う伝送方式
としては、例えば日立評論Vol71.No.3（1989年３月）
「配電線搬送方式による開閉器遠隔監視制御システム」
に記載されている零相キャリア伝送方式が知れられてい
る。この伝送方式によれば、送信側においては、三相配
電線のうち搬送信号を伝送する基準相と大地間に小容量
のインピーダンスを送信信号の「１」又は「０」に合わ
せて挿入し、ほぼ平衡状態にある対地静電容量を僅かに
変化させて零相電圧を発生させる構成が採用されてい
る。また受信側では、三相配電線の対地間電圧をコンデ
ンサ分圧器を介して取り出し、各相の電圧をベクトル合
成して零相電圧を検出し、零相電圧と基準相の搬送信号
とを積算して直流成分と第２高調波成分を含む検波信号
を抽出し、この検波信号から高調波成分を取り除いて直
流成分のみを抽出し、この直流成分を受信信号として復
調する構成が採用されている。As a transmission method for transmitting and receiving information using a distribution line as a signal transmission path, for example, Hitachi Review Vol. 71, No. 3 (March 1989)
"Remote monitoring and control system for switches using distribution line transport method"
Is known. According to this transmission method, on the transmitting side, a small-capacity impedance is inserted between the reference phase of the three-phase distribution line for transmitting the carrier signal and the ground in accordance with "1" or "0" of the transmission signal, and is almost A configuration is employed in which a zero-phase voltage is generated by slightly changing the ground capacitance in an equilibrium state. On the receiving side, the voltage to ground of the three-phase distribution line is taken out through the capacitor voltage divider, the voltage of each phase is vector-combined to detect the zero-phase voltage, and the zero-phase voltage and the carrier signal of the reference phase are integrated. In this configuration, a detection signal including a DC component and a second harmonic component is extracted, a harmonic component is removed from the detection signal, only a DC component is extracted, and the DC component is demodulated as a reception signal.
しかし、上記従来技術においては、配電系統のインピ
ーダンスが変化するという点については配慮がされてお
らず、気象条件による系統設備の絶縁劣化が発生した
り、塩害が発生したりして配電系統の対地インピーダン
スが低下すると、搬送信号の受信レベルが低下し安定し
た通信ができなくなる。すなわち、配電系統において、
絶縁劣化が発生しない場合には、配電系統の零相等価回
路は第７図のように表わされ、信号送信時に発生する零
相電圧Voは基準相電圧Eaと同相となる。ところが、配電
系統の絶縁劣化によって対地インピーダンスが低下する
と、第８図に示されるように、リーク抵抗Rlを介してリ
ーク電流が流れ、受信信号の位相が変化する。例えば、
リーク抵抗Rlと対地静電容量3Cのインピーダンスが共に
等しくなったときには基準相電圧Eaと零相電圧Voとの位
相差が45度となり、受信信号のレベルが同相のときの71
％（cos45°＝0.71）に低下する。さらに塩害や絶縁劣
化の発生によって配電系統の状態が不安定になると、リ
ーク電流の揺らぎなどによって零相伝送における雑音成
分が大きくなり、S/N比が低下し通信状態が不調になり
やすい。However, the above prior art does not consider that the impedance of the distribution system changes, and insulation degradation of the system equipment due to weather conditions or salt damage may occur, and the distribution system may be grounded. When the impedance decreases, the reception level of the carrier signal decreases, and stable communication cannot be performed. That is, in the distribution system,
If the insulation deterioration does not occur, zero-phase equivalent circuit of the power distribution system is expressed as FIG. 7, the zero-phase voltage Vo generated during signal transmission a reference phase voltage E a same phase. However, when the impedance to the ground decreases due to insulation deterioration of the distribution system, as shown in FIG. 8, a leak current flows through the leak resistor Rl, and the phase of the received signal changes. For example,
The phase difference between the reference phase voltage E a and the zero-phase voltage Vo becomes 45 degrees when the impedance of the leak resistor Rl and the earth capacitance 3C becomes both equal, the level of the received signal when the phase 71
% (Cos 45 ° = 0.71). Further, when the state of the power distribution system becomes unstable due to salt damage or insulation deterioration, noise components in zero-phase transmission increase due to fluctuations in leak current, etc., so that the S / N ratio decreases and the communication state tends to malfunction.
本発明の目的は、配電線の対地インピーダンスが変化
した場合でも安定した状態で搬送信号を受信することが
できる配電線搬送信号受信装置を提供することにある。An object of the present invention is to provide a distribution line carrier signal receiving device capable of receiving a carrier signal in a stable state even when the ground impedance of the distribution line changes.
前記目的を達成するために、本発明は、第１の装置と
して、三相配電線の各相の電圧信号から零相電圧を検出
する零相電圧検出手段と、三相配電線のうち搬送信号が
伝送する基準相の信号と零相電圧検出手段の検出出力と
を積算して検波信号を出力する主検波手段と、主検波手
段出力の検波信号の中から直流成分のみを抽出して復調
信号を出力する主復調手段と、三相配電線の基準相の信
号の位相を移相する移相手段と、移相手段の出力信号と
零相電圧検出手段の検出出力とを積算して検波信号を出
力する副検波手段と、副検波手段出力の検波信号の中か
ら直流成分のみを抽出して復調信号を出力する副復調手
段と、主復調手段と副復調手段の各復調信号のレベルを
比較し、レベルの高い復調信号を選択して出力する選択
手段とを有する配電線搬送信号受信装置を構成したもの
である。In order to achieve the above object, the present invention provides, as a first device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a carrier signal transmitted from a three-phase distribution line. Main detection means for integrating the reference phase signal to be detected and the detection output of the zero-phase voltage detection means to output a detection signal, and extracting a DC component only from the detection signal output from the main detection means and outputting a demodulated signal. Main demodulating means, a phase shifting means for shifting the phase of the signal of the reference phase of the three-phase distribution line, and an output signal of the phase shifting means and a detection output of the zero-phase voltage detecting means are integrated to output a detection signal. The sub-detecting means, the sub-demodulating means for extracting only the DC component from the detection signal output from the sub-detecting means and outputting the demodulated signal, and comparing the levels of the respective demodulated signals of the main demodulating means and the sub-demodulating means, Selecting means for selecting and outputting a demodulated signal having a high level Is obtained by constituting the carrier signal receiving apparatus.
第２の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、主検波手段出力の検波信号の中から直流成分のみ
を抽出して復調信号を出力する主復調手段と、三相配電
線の基準相の信号の位相を順次移相する複数移相手段
と、各移相手段の出力信号と零相電圧検出手段の検出出
力とをそれぞれ積算して検波信号を出力する複数の副検
波手段と、各副検波手段出力の検波信号の中から直流成
分のみを抽出して復調信号を出力する複数の副復調手段
と、主復調手段と各副復調手段の各復調信号のレベルを
比較して、最大レベルの復調信号のみを選択する選択手
段とを有する配電線搬送信号受信装置を構成したもので
ある。As a second device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line Main detection means for integrating the detection output to output a detection signal; main detection means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal; and a reference phase for a three-phase distribution line. A plurality of phase-shifting means for sequentially shifting the phase of the signal, a plurality of sub-detecting means for integrating the output signal of each phase-shifting means and the detection output of the zero-phase voltage detecting means to output a detection signal, A plurality of sub-demodulation means for extracting only the DC component from the detection signal output from the sub-detection means and outputting a demodulated signal, and comparing the levels of the demodulated signals of the main demodulation means and the sub-demodulation means with the maximum level Distribution line having selection means for selecting only the demodulated signal of It is obtained by constituting the signal receiving apparatus.
第３の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、主検波手段出力の検波信号の中から直流成分のみ
を抽出して復調信号を出力する主復調手段と、三相配電
線の基準相の信号の位相を相異なる位相に移相する複数
の移相手段と、各移相手段の出力信号と零相電圧検出手
段の検出出力とをそれぞれ積算して検波信号を出力する
複数の副検波手段と、各副検波手段出力の検波信号の中
から直流成分のみを抽出して復調信号を出力する複数の
副復調手段と、主復調手段と副復調手段の各復調信号の
レベルを比較して、最大レベルの復調信号のみを選択す
る選択手段とを有する配電線搬送信号受信装置を構成し
たものである。As a third device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line. Main detection means for integrating the detection output to output a detection signal; main detection means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal; and a reference phase for a three-phase distribution line. A plurality of phase shifting means for shifting the phase of the signal to different phases, and a plurality of sub-detectors for integrating the output signal of each phase shifting means and the detection output of the zero-phase voltage detecting means to output a detection signal Means, a plurality of sub-demodulation means for extracting only a DC component from the detection signal output from each sub-detection means and outputting a demodulated signal, and comparing the levels of the respective demodulated signals of the main demodulation means and the sub-demodulation means. Selecting means for selecting only the demodulated signal of the maximum level It is obtained by constituting the distribution line carrier signal receiving apparatus.
第４の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、主検波手段出力の検波信号の中から直流成分のみ
を抽出して復調信号を出力する主復調手段と、三相配電
線の基準相の信号の位相を移相する移相手段と、移相手
段の出力信号と零相電圧検出手段の検出出力とを積算し
て検波信号を出力する副検波手段と、副検波手段出力の
検波信号の中から直流成分のみを抽出して復調信号を出
力する副復調手段と、主復調手段と副復調手段から復調
信号を取り込んで、各復調信号の誤り検定を行い、正常
な復調信号のみを選択する配電線搬送信号受信装置を構
成したものである。As a fourth device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of the three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line Main detection means for integrating the detection output to output a detection signal; main detection means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal; and a reference phase for a three-phase distribution line. Phase-shifting means for shifting the phase of the signal, a sub-detecting means for integrating the output signal of the phase-shifting means and the detection output of the zero-phase voltage detecting means to output a detection signal, and a detection signal output from the sub-detecting means The sub demodulator that extracts only the DC component from among the demodulated signals and outputs the demodulated signal, takes in the demodulated signals from the main demodulator and the sub demodulator, performs an error test on each demodulated signal, and selects only the normal demodulated signal. To form a distribution line carrier signal receiving apparatus.
第５の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、主検波手段出力の検波信号の中から直流成分のみ
を抽出して復調信号を出力する主復調手段と、三相配電
線の基準相の信号の位相を順次移相する複数の移相手段
と、各移相手段の出力信号と零相電圧検出手段の検出出
力とをそれぞれ積算して検波信号を出力する複数の副検
波手段と、各副検波手段出力の検波信号の中から直流成
分のみを抽出して復調信号を出力する複数の副復調手段
と、主復調手段と各副復調手段から復調信号を取り込ん
で各復調信号の誤り検定を行い、正常な復調信号のみを
選択する選択手段とを有する配電線搬送信号受信装置を
構成したものである。As a fifth device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line. Main detection means for integrating the detection output to output a detection signal; main detection means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal; and a reference phase for a three-phase distribution line. A plurality of phase shift means for sequentially shifting the phase of the signal, a plurality of sub-detection means for integrating the output signal of each phase shift means and the detection output of the zero-phase voltage detection means and outputting a detection signal, A plurality of sub-demodulation means for extracting only a DC component from a detection signal output from each sub-detection means and outputting a demodulated signal; and receiving demodulated signals from the main demodulation means and each sub-demodulation means and testing each demodulated signal for errors. And selecting means for selecting only a normal demodulated signal. It is obtained by constituting the distribution line carrier signal receiving apparatus having.
第６の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、主検波手段出力の検波信号の中から直流成分のみ
を抽出して復調信号を出力する主復調手段と、三相配電
線の基準相の信号の位相を相異なる位相に移相する複数
の移相手段と、各移相手段の出力信号と零相電圧検出手
段の検出出力の検波信号の中から直流成分のみを抽出し
て復調信号を出力する複数の副復調手段と、主復調手段
と各副復調手段から復調信号を取り込んで各復調信号の
誤り検定を行い、正常な復調信号のみを選択する選択手
段とを有する配電線搬送信号受信装置を構成したもので
ある。As a sixth device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of the three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line Main detection means for integrating the detection output to output a detection signal; main detection means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal; and a reference phase for a three-phase distribution line. A plurality of phase shifting means for shifting the phase of the signal to different phases, and extracting only a DC component from a detection signal of an output signal of each phase shifting means and a detection output of the zero-phase voltage detecting means, and demodulating a signal. A distribution line carrier signal having a plurality of sub-demodulation means for outputting a demodulated signal from the main demodulation means and each sub-demodulation means, performing an error test on each demodulated signal, and selecting only a normal demodulated signal. This is a configuration of a receiving device.
第７の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、三相配電線の基準相の信号を取り込み、こ信号の
位相を移相する移相手段と、移相手段の出力信号と零相
電圧検出手段の検出出力とを積算して検波信号を出力す
る副検波手段と、主検波手段出力の検波信号と副検波手
段出力の検波信号のうち指令に応じて検波信号を選択し
て出力する選択手段と、選択手段出力の検波信号の中か
ら直流成分のみを抽出して復調信号を出力する復調手段
と、復調信号のレベルを監視して、復調信号のレベルが
設定レベル以下となるまでは主検波手段出力の検波信号
の選択を、それ以外のときには副検波手段出力の検波信
号の選択を選択手段に対して指令する選択指令手段とを
有する配電線搬送信号受信装置を構成したものである。As a seventh device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of the three-phase distribution line, a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line. Main detection means for integrating the detection output and outputting a detection signal, a phase shift means for taking in the signal of the reference phase of the three-phase distribution line and shifting the phase of this signal, and an output signal of the phase shift means and a zero phase A sub-detection unit that integrates the detection output of the voltage detection unit and outputs a detection signal, and selects and outputs a detection signal according to a command from the detection signal of the main detection unit output and the detection signal of the sub-detection unit output Selecting means, demodulating means for extracting only a DC component from the detection signal output from the selecting means and outputting a demodulated signal, and monitoring the level of the demodulated signal until the level of the demodulated signal falls below a set level. Select the detection signal output from the main detection means. Sometimes it is obtained by constituting the distribution line carrier signal receiving apparatus and a selection command means for commanding the selection of the detection signal of the sub-detecting means outputs the selection means.
第８の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、三相配電線の基準相の信号の位相を段階的に順次
移相して出力する複数の移相手段と、各移相手段の出力
信号と零相電圧検出手段の検出出力とをそれぞれ積算し
て検波信号を出力する複数の副検波手段と、主検波手段
出力の検波信号と各副検波手段出力の検波信号のうち単
一の検波信号を指令により選択する選択手段と、選択手
段出力の検波信号の中から直流成分のみを抽出して復調
信号を出力する復調手段と、復調信号のレベルを監視し
て、復調信号のレベルが設定レベル以下となるまでは主
検波手段出力の検波信号の選択を、復調信号のレベルが
設定レベル以下となる毎に基準相の信号よりも位相差が
大きくなる移相手段からの信号に基づく検波信号の選択
を順次選択手段に対して指令する選択指令手段とを有す
る配電線搬送信号受信装置を構成したものである。As an eighth device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of the three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line Main detection means for integrating the detection output and outputting a detection signal; a plurality of phase shift means for sequentially and sequentially shifting the phase of the signal of the reference phase of the three-phase distribution line; and a plurality of phase shift means. A plurality of sub-detection means for integrating the output signal and the detection output of the zero-phase voltage detection means to output a detection signal; a single detection signal of the main detection means output signal and a detection signal of each sub-detection means output; Selection means for selecting a detection signal by a command, demodulation means for extracting only a DC component from the detection signal output from the selection means and outputting a demodulated signal, and monitoring the level of the demodulated signal; Until the level falls below the set level, detection of the main detection means output The selection is performed by sequentially instructing the selection means to select the detection signal based on the signal from the phase shift means in which the phase difference becomes larger than the reference phase signal every time the level of the demodulated signal falls below the set level. And a distribution line carrier signal receiving device having command means.
第９の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、三相配電線の基準相の信号をそれぞれ取り込み、
この信号の位相を相異なる位相に移相して出力する複数
の移相手段と、各位相手段の出力信号と零相電圧検出手
段の検出出力とをそれぞれ積算して検波信号を出力する
複数の副検波手段と、主検波手段出力の検波信号と各副
検波手段出力の検波信号のうち単一の検波信号を指令に
より選択する選択手段と、選択手段出力の検波信号の中
から直流成分のみを抽出して復調信号を出力する復調手
段と、復調信号のレベルを監視して、復調信号のレベル
が設定レベル以下となるまでは主検波手段出力の検波信
号の選択を、復調信号のレベルが設定レベル以下となる
毎に基準相の信号よりも位相差が大きくなる移相手段か
らの信号に基づく検波信号の選択を順次選択手段に対し
て指令する選択指令手段とを有する配電線搬送信号受信
装置を構成したものである。As a ninth device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of the three-phase distribution line, and a reference phase signal transmitted by the carrier signal and the zero-phase voltage detecting means of the three-phase distribution line The main detection means that integrates the detection output and outputs the detection signal, and the signal of the reference phase of the three-phase distribution line are fetched,
A plurality of phase shifting means for shifting the phase of this signal to a different phase and outputting the signals; and a plurality of means for integrating the output signal of each phase means and the detection output of the zero-phase voltage detecting means to output a detection signal. Sub-detection means, selection means for selecting a single detection signal from the detection signal output from the main detection means and the detection signal output from each sub-detection means by a command, and only the DC component from the detection signals output from the selection means. The demodulation means for extracting and outputting the demodulated signal and the level of the demodulated signal are monitored, and the detection signal output from the main detection means is selected until the level of the demodulated signal falls below the set level, and the level of the demodulated signal is set. Selection command means for sequentially instructing the selection means to select a detection signal based on a signal from the phase shift means in which the phase difference becomes larger than the signal of the reference phase every time the signal level becomes equal to or less than the level. Also composed It is.
第10の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、三相配電線の基準相の信号を取り込み、この信号
の位相を移相する移相手段と、移相手段の出力信号と零
相電圧検出手段の検出出力とを積算して検波信号を出力
する副検波手段と、主検波手段出力の検波信号と副検波
手段出力の検波信号のうち指令に応じて検波信号を選択
して出力する選択手段と、選択手段出力の検波信号の中
から直流成分のみを抽出して復調信号を出力する復調手
段と、復調信号の誤りを検定を行い、正常な復調信号が
得られる検波信号の選択を選択手段に対して指令する選
択指令手段とを有する配電線搬送信号受信装置を構成し
たものである。As a tenth device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line Main detection means for integrating the detection output to output a detection signal, phase-shift means for taking in the signal of the reference phase of the three-phase distribution line and shifting the phase of this signal, and the output signal of the phase-shift means and the zero phase A sub-detection unit that integrates the detection output of the voltage detection unit and outputs a detection signal, and selects and outputs a detection signal according to a command from the detection signal of the main detection unit output and the detection signal of the sub-detection unit output Selection means, demodulation means for extracting only a DC component from the detection signal output from the selection means and outputting a demodulated signal, and testing for errors in the demodulated signal to select a detected signal from which a normal demodulated signal can be obtained. Selection means for instructing the selection means It is obtained by constituting the distribution line carrier signal receiving apparatus.
第11の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、三相配電線の基準相の信号の位相を段階的に順次
移相して出力する複数の移相手段と、各位相手段の出力
信号と零相電圧検出手段の検出出力とをそれぞれ積算し
て検波信号を出力する複数の副検波手段と、主検波手段
出力の検波信号と各副検波手段出力の検波信号のうち単
一の検波信号を指令により選択する選択手段と、選択手
段出力の検波信号の中から直流成分のみを抽出して復調
信号を出力する復調手段と、復調信号の誤りを検定を行
い、正常な復調信号が得られる検波信号の選択を選択手
段に対して指令する選択指令手段とを有する配電線搬送
信号受信装置を構成したものである。As an eleventh device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of the three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line Main detection means for integrating the detection output to output a detection signal, a plurality of phase shift means for sequentially shifting the phase of the signal of the reference phase of the three-phase distribution line in a stepwise manner, and an output of each phase means A plurality of sub-detection means for integrating the signal and the detection output of the zero-phase voltage detection means to output a detection signal; a single detection signal out of the detection signal of the main detection means and the detection signal of each sub-detection means A selecting means for selecting a signal by a command, a demodulating means for extracting only a DC component from a detection signal output from the selecting means and outputting a demodulated signal, and a test for a demodulated signal error to obtain a normal demodulated signal. The selection means to select the detection signal to be used It is obtained by constituting the distribution line carrier signal receiving apparatus and a 択指 Ordinance means.
第12の装置として、三相配電線の各相の電圧信号から
零相電圧を検出する零相電圧検出手段と、三相配電線の
うち搬送信号が伝送する基準相の信号と零相電圧検出手
段の検出出力とを積算して検波信号を出力する主検波手
段と、三相配電線の基準相の信号をそれぞれ取り込み、
この信号の位相を相異なる位相に移相して出力する複数
の移相手段と、各位相手段の出力信号と零相電圧検出手
段の検出出力とをそれぞれ積算して検波信号を出力する
複数の副検波手段と、主検波手段出力の検波信号と各副
検波手段出力の検波信号のうち単一の検波信号を指令に
より選択する選択手段と、選択手段出力の検波信号の中
から直流成分のみを抽出して復調信号を出力する復調手
段と、復調信号の誤りを検定を行い、正常な復調信号が
得られる検波信号の選択を選択手段に対して指令する選
択指令手段とを有する配電線搬送信号受信装置を構成し
たものである。As a twelfth device, a zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a reference phase signal and a zero-phase voltage detecting means transmitted by a carrier signal among the three-phase distribution lines. The main detection means that integrates the detection output and outputs the detection signal, and the signal of the reference phase of the three-phase distribution line are fetched,
A plurality of phase shifting means for shifting the phase of this signal to a different phase and outputting the signals; and a plurality of means for integrating the output signal of each phase means and the detection output of the zero-phase voltage detecting means to output a detection signal. Sub-detection means, selection means for selecting a single detection signal from the detection signal output from the main detection means and the detection signal output from each sub-detection means by a command, and only the DC component from the detection signals output from the selection means. A distribution line carrier signal having demodulation means for extracting and outputting a demodulated signal, and selection command means for testing the error of the demodulated signal and selecting a detection signal for obtaining a normal demodulated signal to the selection means. This is a configuration of a receiving device.
塩害や絶縁劣化による対地インピーダンスの低下分
は、第８図の等価回路に示されるように、抵抗分となる
ところから、受信側で検出される零相電圧Vo′は次の
（１）式によって表わされる。As shown in the equivalent circuit of FIG. 8, the drop in the ground impedance due to salt damage and insulation deterioration becomes resistance, and the zero-phase voltage Vo ′ detected on the receiving side is calculated by the following equation (1). Is represented.
ただし、 上記（１）式により零相電圧Vo′は基準相電圧Eaより
位相 進み位相となることが判る。 However, (1) zero-phase voltage Vo 'phase than the reference phase voltage E a by formula It can be seen that the phase is advanced.
そこで、配電系統の対地インピーダンスに変化がない
ときには、基準相電圧EaをVa・sinωｔ、零相電圧Vo′
をVo・sin（ωｔ＋ψ）として、これらの信号を積算す
ることによって零相電圧の変化分を抽出する。一方、配
電系統のインピーダンスが低下したときには、基準相電
圧Eaの信号の位相をθ移相させた電圧信号Va・sin（ω
ｔ＋θ）と零相電圧Vo・sin（ωｔ＋ψ）とを積算して
零相電圧の変化分を抽出する構成を採用している。すな
わち、移相手段を通過しない基準相電圧は対地インピー
ダンスの低下に応じてそのレベルが低下するが、移相手
段を通過した基準相電圧は対地インピーダンスの低下に
伴ってレベルが徐々に高くなり、その後低下するため、
移相手段を通過しない信号と移相手段を通過した信号の
うちレベルの高い信号を零相電圧の変化分の信号として
選択すれば、搬送信号を安定した状態で受信することが
できる。また受信信号の選択として、受信レベルの代り
に、零相電圧の変化分を示す信号として、移相手段を通
過しないで得られた信号と移相手段を通過して得られた
信号に対する誤り検定をそれぞれ行い、誤りのない信号
を受信信号として選択することも可能である。Therefore, when there is no change in the ground impedance of the power distribution system, the reference phase voltage E a V a · sinωt, zero-phase voltage Vo '
Is Vo · sin (ωt + ψ), and these signals are integrated to extract a change in the zero-phase voltage. On the other hand, when the impedance of the power distribution system is decreased, the voltage signal the phase of the reference phase voltage E a of the signal obtained by θ phase V a · sin (ω
t + θ) and the zero-phase voltage Vo · sin (ωt + ψ) are integrated to extract a change in the zero-phase voltage. That is, the level of the reference phase voltage that does not pass through the phase shift means decreases in accordance with the decrease in the ground impedance, but the level of the reference phase voltage that has passed through the phase shift means gradually increases in accordance with the decrease in the ground impedance, Then it drops,
If a high-level signal is selected as a signal corresponding to a change in the zero-phase voltage among signals that have not passed through the phase shifting means and signals that have passed through the phase shifting means, the carrier signal can be received in a stable state. Also, as a selection of a reception signal, instead of the reception level, an error test is performed on a signal obtained without passing through the phase shift means and a signal obtained through the phase shift means as a signal indicating a change in the zero-phase voltage. , Respectively, and it is also possible to select an error-free signal as a received signal.
以下、本発明の一実施例を図面に基づいて説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
第１図において、三相配電線10,12,14には送信装置16
と受信装置18が設けられており、送信装置16がＡ相の配
電線10に接続され、受信装置18がコンデンサ分圧器20,2
2を介して配電線10,12,14に接続されている。In FIG. 1, three-phase distribution lines 10, 12, and 14 have transmitting devices 16
And a receiving device 18 are provided, the transmitting device 16 is connected to the A-phase distribution line 10, and the receiving device 18 is connected to the capacitor voltage dividers 20,2.
It is connected to distribution lines 10, 12, and 14 via 2.
送信装置16は、配電線10に接続されたコンデンサ24と
コンデンサ24に直列接続されたスイッチ26と、スイッチ
26を送信データに合わせて駆動するための制御回路など
から構成されており、配電線10を基準相として、基準相
と大地間に送信信号に合わせて小容量のコンデンサ24を
挿入するために、系統周波数の１サイクル単位でスイッ
チ26をオンオフし、基準相の対地電位を僅かに変化させ
て搬送信号を伝送するように構成されている。スイッチ
26が、第２図の（Ａ）に示されるような送信信号に合わ
せてオンオフされると、送信信号に対応して、配電系統
の零相電圧が僅かに変化し、配電系統には、第２図の
（Ｂ）に示されるような零相電圧が発生する。この零相
電圧は、コンデンサ24の容量が零相回路の系統インピー
ダンスの約100倍、非接地系においては対地静電容量28
の１％程度の定められているため、完全一線地絡事故に
より発生する零相電圧の１％程度の大きさの信号とな
る。The transmitting device 16 includes a capacitor 24 connected to the distribution line 10, a switch 26 connected in series to the capacitor 24, and a switch 26.
26 is configured with a control circuit and the like for driving according to the transmission data, and with the distribution line 10 as the reference phase, in order to insert a small-capacity capacitor 24 between the reference phase and the ground in accordance with the transmission signal, The switch 26 is turned on and off in units of one cycle of the system frequency, and the carrier signal is transmitted by slightly changing the ground potential of the reference phase. switch
26 is turned on and off in accordance with the transmission signal as shown in FIG. 2 (A), the zero-phase voltage of the distribution system slightly changes in response to the transmission signal, and A zero-phase voltage is generated as shown in FIG. This zero-sequence voltage is approximately 100 times the system impedance of the zero-sequence circuit when the capacity of the capacitor 24 is about 100 times, and in a non-grounded system, the capacitance to the ground is 28.
Is set at about 1% of the zero-phase voltage, the signal has a magnitude of about 1% of the zero-sequence voltage generated by the complete single-line ground fault.
受信装置18はベクトル合成器30,同期検波回路34,移相
回路36,同期検波回路38,復調回路40,比較回路42,切換ス
イッチ44を備えて構成されており、ベクトル合成器30に
は配電線10,12,14の電圧がコンデンサ分圧器20,22で分
圧されて入力され、同期検波回路32と移相回路36に基準
相の信号が入力されている。The receiving device 18 includes a vector synthesizer 30, a synchronous detection circuit 34, a phase shift circuit 36, a synchronous detection circuit 38, a demodulation circuit 40, a comparison circuit 42, and a changeover switch 44. The voltages of the electric wires 10, 12, and 14 are divided and input by the capacitor voltage dividers 20 and 22, and the reference phase signal is input to the synchronous detection circuit 32 and the phase shift circuit.
ベクトル合成器30は各相の電圧ａ，ｂ，ｃを取
り込み、これらの電圧を加算して零相電圧ｏを検出す
る零相電圧検出手段として構成されている。同期検波回
路32は、基準相の電圧ａと零相電圧ｏを取り込み、
これらの信号の基準波成分のみを抽出するフィルタと、
各フィルタの出力信号をそれぞれ積算する乗算器を有
し、乗算器から第２図の（Ｃ）に示されるような検波信
号を出力する主検波手段として構成されている。この同
期検波回路32から、次の（２）式に示されるように、基
準相電圧ａ，零相電圧ｏとの積算結果から、直流分
と２倍の周波数成分を含む検波信号が出力される。The vector synthesizer 30 is configured as a zero-phase voltage detecting means for receiving the voltages a , b , and c of each phase, adding these voltages, and detecting a zero-phase voltage o. The synchronous detection circuit 32 takes in the reference phase voltage a and the zero-phase voltage o,
A filter for extracting only the reference wave component of these signals,
It has a multiplier for integrating the output signals of the respective filters, and is configured as main detection means for outputting a detection signal as shown in FIG. 2 (C) from the multiplier. As shown in the following equation (2), the synchronous detection circuit 32 outputs a detection signal including a DC component and a frequency component twice as large as the integration result of the reference phase voltage a and the zero-phase voltage o. .
ここにψは対地インピーダンスにより発生する零相電
圧ｏの基準相電圧ａに対する進み位相の角度であ
る。対地インピーダンスが対地静電容量に比較して十分
大きく零相電圧ｏが基準相電圧ａと同相のときには
ψはほぼ零であるが、絶縁劣化によって対地インピーダ
ンスが低下するに従ってψの値が大きくなり、ψの値は
最大90度まで変化する。 Here, ψ is the angle of the leading phase of the zero-phase voltage o generated by the ground impedance with respect to the reference phase voltage a . When the ground impedance is sufficiently large compared to the ground capacitance and the zero-phase voltage o is in phase with the reference phase voltage a , ψ is almost zero, but as the ground impedance decreases due to insulation deterioration, the value of 大 き く increases, The value of ψ varies up to 90 degrees.
復調回路34は、同期検波回路32の出力の検波信号の中
から直流成分のみを抽出するために、基準波の２倍の周
波数成分を除去するフィルタと、受信装置に受信信号が
ないときにフィルタから発生する残留零相電圧成分を記
憶するアナログメモリと、フィルタの出力信号とアナロ
グメモリからの信号との差から真の零相電圧のみを抽出
する加算器を備えており、加算器から比較回路42と切換
スイッチ44へ第２図の（Ｄ）に示されるような復調信号
を出力する主復調手段として構成されている。The demodulation circuit 34 includes a filter for removing only a DC component from a detection signal output from the synchronous detection circuit 32, and a filter for removing a frequency component twice as large as the reference wave, and a filter when the reception device has no reception signal. And an adder for extracting only a true zero-sequence voltage from a difference between an output signal of the filter and a signal from the analog memory. It is configured as main demodulation means for outputting a demodulated signal as shown in FIG.
移相回路36は基準相電圧ａの位相を60度移相する移
相手段として構成されている。同期検波回路38は同期検
波回路32と同様に一対のフィルタと乗算器から構成され
ており、移相回路36出力の基準相電圧ａと零相電圧
ｏとを積算して同期検波による検波信号を出力するよう
に構成されている。この同期検波回路38からは、次の
（３）式に示されるように、基準相電圧ａと零相電圧
ｏの積算結果から、直流成分と２倍の周波数成分を含
む検波信号が出力される。The phase shift circuit 36 is configured as phase shift means for shifting the phase of the reference phase voltage a by 60 degrees. The synchronous detection circuit 38 is composed of a pair of filters and a multiplier similarly to the synchronous detection circuit 32, and integrates the reference phase voltage a and the zero-phase voltage o of the output of the phase shift circuit 36 to generate a detection signal by synchronous detection. It is configured to output. As shown in the following equation (3), the synchronous detection circuit 38 outputs a detection signal including a DC component and a double frequency component from the integration result of the reference phase voltage a and the zero-phase voltage o. .
ここにθは移相回路36のシフト量＝60度を示す。 Here, θ indicates the shift amount of the phase shift circuit 36 = 60 degrees.
同期検波回路38からは、第２図の（Ｃ）に示されるよ
うな検波信号が出力されるが、同期検波回路32の出力信
号は、第３図の特性（Ａ）に示されるように、対地イン
ピーダンスの低下に応じて出力レベルは順次低下するの
に対して、同期検波回路38からは、第３図の特性（Ｂ）
に示されるように、対地インピーダンスの低下によって
基準相電圧ａと零相電圧ｏとの位相差が60度となっ
たときが最大レベルとなるようになっている。そして基
準相電圧ａと零相電圧ｏとの位相差が30度になった
とき、すなわちψ＝30°となったとき同期検波回路32同
様に、受信信号の87％のレベルの信号を出力することが
できるようになっている。復調回路40は復調回路34と同
様にフィルタ，アナログメモリ，加算器を備え、第２図
の（Ｄ）に示されるような復調信号を出力する復調手段
として構成されている。A detection signal as shown in FIG. 2C is output from the synchronous detection circuit 38. The output signal of the synchronous detection circuit 32 is, as shown in the characteristic (A) of FIG. While the output level sequentially decreases in accordance with the decrease in the ground impedance, the synchronous detection circuit 38 outputs the characteristic (B) shown in FIG.
As shown in (2), the maximum level is reached when the phase difference between the reference phase voltage a and the zero-phase voltage o becomes 60 degrees due to a decrease in the ground impedance. When the phase difference between the reference phase voltage a and the zero-phase voltage o becomes 30 degrees, that is, when ψ = 30 °, a signal having a level of 87% of the received signal is output similarly to the synchronous detection circuit 32. You can do it. The demodulation circuit 40 includes a filter, an analog memory, and an adder similarly to the demodulation circuit 34, and is configured as demodulation means for outputting a demodulated signal as shown in FIG. 2 (D).
比較回路42は復調回路34,40からの出力信号を取り込
み、各出力信号のレベルを判定し、レベルの高い復調信
号を選択するための信号を切換スイッチ42に出力するよ
うになっている。すなわち、配電系統に絶縁劣化が生じ
てないときには復調回路34からの信号を選択し、絶縁劣
化によって復調回路34からの復調信号のレベルが正常時
の87％まで低下するまでは復調回路34からの信号を選択
し、その復調回路34からの復調信号のレベルが87％より
低下した場合には復調回路40からの復調信号を選択し、
選択した復調信号を切換信号44を介して出力する選択手
段として構成されている。The comparison circuit 42 takes in the output signals from the demodulation circuits 34 and 40, determines the level of each output signal, and outputs a signal for selecting a demodulated signal having a high level to the changeover switch 42. That is, when the insulation deterioration has not occurred in the distribution system, the signal from the demodulation circuit 34 is selected. Until the level of the demodulated signal from the demodulation circuit 34 decreases to 87% of the normal state due to the insulation deterioration, the signal from the demodulation circuit 34 is selected. When the level of the demodulated signal from the demodulation circuit 34 is lower than 87%, the demodulation signal from the demodulation circuit 40 is selected.
The selected demodulation signal is configured as a selection unit that outputs the selected demodulated signal via the switching signal 44.
このように、本実施例においては、復調回路34,40の
出力信号のレベルを比較して、レベルの高い復調信号を
選択するようにしているため、配電系統の対地インピー
ダンスが低下しても安定した状態で搬送信号を受信する
ことが可能となる。As described above, in the present embodiment, the levels of the output signals of the demodulation circuits 34 and 40 are compared to select a demodulated signal having a high level, so that even if the impedance to the ground of the power distribution system is lowered, it is stable. It is possible to receive the carrier signal in the state in which it is performed.
また前記実施例においては、復調回路34,40の出力レ
ベルを比較することによって最適な復調信号を選択する
ものについて述べたが、各復調回路34,40の出力信号を
データ処理回路に入力し、データ処理回路においてデー
タの誤り検定を行い、この誤り検定から正常な復調信号
のみを選択する選択手段を設けることも可能である。こ
の誤り検定の方式としては、１ワード単位のワード検定
と全ワードにまたがるフレーム検定の２方式を用いるこ
とが可能である。ワード検定方式としては、伝送内容の
誤認識を避けるため、下り・上りの伝送方向を検定する
同期信号検定方式、6C3定マーク符号構成を検定する定
マーク検定方式、スイッチコード、機能識別コードの固
定マークを検定する固定マーク検定方式が挙げられる。
またフレーム検定方式としては、指令内容によって決ま
る伝送に必要なワード数を検定するフレーム長検定方
式、１ワード毎に反転していることを検定する反転二連
相検定方式、全ワードに対するパリティを検定する水平
パリティ検定方式が挙げられる。Further, in the above-described embodiment, the case where the optimum demodulation signal is selected by comparing the output levels of the demodulation circuits 34 and 40 has been described, but the output signals of the demodulation circuits 34 and 40 are input to the data processing circuit, It is also possible to perform a data error test in the data processing circuit and provide a selection means for selecting only a normal demodulated signal from the error test. As a method of this error test, it is possible to use two methods of a word test in units of one word and a frame test which covers all words. The word assay method, in order to avoid erroneous recognition of transmission content, synchronization signals assay method for assaying transmission direction of the downlink-uplink, a constant mark test method to test the 6 C 3 constant mark code construction, the code on the switch, the function identification code The fixed mark verification method for verifying the fixed mark is described.
The frame verification method includes a frame length verification method for verifying the number of words required for transmission determined by the contents of a command, an inverted dual-phase test method for verifying that each word is inverted, and a parity test for all words. Horizontal parity test method.
前記実施例においては、移相回路36として基準相電圧
ａの位相を60度シフトするものについて述べたが、第
４図に示されるように、基準相電圧ａの位相を順次移
相する移相回路36A1,36B1，…，36N1へ設けることも可
能であり、第５図に示されるように、基準相電圧ａの
位相を相異なる位相にシフトする移相回路36A2,36B2，
…，36N2を設けることも可能である。これらの場合に
は、復調回路34及び復調回路40A1,A2，40B1,B2，…，40
N1,N2からの信号を比較回路46に取り込み、比較回路46
において入力信号の最大レベルを判定し、切換スイッチ
48において最大レベルの復調信号を選択すれば、前記実
施例よりも受信レベルの高い復調信号を選択することが
可能となる。例えば移相回路を５回路で構成すれば、注
入信号成分（送信信号のレベル）の98％以上の信号を受
信することが可能となる。In the above embodiment, the reference phase voltage is used as the phase shift circuit 36.
Although the phase shift of the phase a is shifted by 60 degrees, as shown in FIG. 4, the phase shift circuits 36A 1 , 36B 1 ,..., 36N 1 sequentially shift the phase of the reference phase voltage a. As shown in FIG. 5, the phase shift circuits 36A 2 , 36B 2 , which shift the phase of the reference phase voltage a to different phases, as shown in FIG.
..., it is also possible to provide the 36N 2. In these cases, the demodulation circuit 34 and the demodulation circuits 40A 1 , A 2 , 40B 1 , B 2 ,.
The signals from N 1 and N 2 are taken into the comparison circuit 46, and the comparison circuit 46
Judge the maximum level of the input signal at
If the maximum level demodulated signal is selected in 48, it becomes possible to select a demodulated signal having a higher reception level than in the above-described embodiment. For example, if the phase shift circuit is composed of five circuits, it is possible to receive a signal of 98% or more of the injection signal component (transmission signal level).
また第４図及び第５図に示される実施例において、比
較回路46,切換スイッチ48で最大レベルの復調信号を選
択する代りに、各復調信号の出力信号をデータ処理回路
に入力して各復調信号の誤り検定を行い、誤りの少ない
復調信号を受信データとして選択することも可能であ
る。Also, in the embodiment shown in FIGS. 4 and 5, instead of selecting the maximum level demodulated signal by the comparison circuit 46 and the changeover switch 48, the output signal of each demodulated signal is inputted to the data processing circuit and each demodulated signal is inputted. It is also possible to perform a signal error test and select a demodulated signal with few errors as received data.
次に、復調回路を簡素化する場合には、第６図に示さ
れるような構成を採用することが可能である。すなわ
ち、同期検波回路32,38の出力側に切換スイッチ44を配
置し、切換スイッチ44の出力側に復調回路34を配置し、
復調回路34の出力信号のレベルを選択回路50において監
視し、復調信号のレベルの87％以下に低下したときには
同期検波回路32からの信号に代って同期検波回路38から
の信号を選択すれば、単一の復調回路34によっても前記
実施例と同様に安定した状態で搬送信号を受信すること
ができる。Next, when simplifying the demodulation circuit, a configuration as shown in FIG. 6 can be adopted. That is, the changeover switch 44 is arranged on the output side of the synchronous detection circuits 32 and 38, and the demodulation circuit 34 is arranged on the output side of the changeover switch 44.
The level of the output signal of the demodulation circuit 34 is monitored by the selection circuit 50, and when the level of the demodulated signal drops to 87% or less, the signal from the synchronous detection circuit 38 is selected instead of the signal from the synchronous detection circuit 32. Also, the carrier signal can be received in a stable state by the single demodulation circuit 34 as in the above embodiment.
また、前記の場合、選択回路50においてレベルを監視
する代りに、復調回路34の出力信号をデータに変換し、
このデータの内容に関する誤り検定を行い、正常なデー
タが得られるように切換スイッチ44を切換えるようにす
ることも可能である。この方式は、移相回路36の代り
に、第４図及び第５図に示されるような移相回路を有す
るものにも適用することは可能である。In the above case, instead of monitoring the level in the selection circuit 50, the output signal of the demodulation circuit 34 is converted into data,
It is also possible to perform an error test on the contents of this data and switch the changeover switch 44 so as to obtain normal data. This method can be applied to a circuit having a phase shift circuit as shown in FIGS. 4 and 5 instead of the phase shift circuit 36.
以上説明したように、本発明によれば、移相手段を通
過しない信号と移相手段を通過した信号に基づく信号を
それぞれ比較し、受信した搬送信号のうち受信レベルの
高いものあるいは受信データとして誤りのないものを採
用するようにしたため、配電系統の対地インピーダンス
が低下した場合でも安定した状態で搬送信号を受信する
ことができる。さらに移相手段を複数個設ければ、さら
に受信情報の安定度を増すことが可能となる。As described above, according to the present invention, a signal that does not pass through the phase shifting means is compared with a signal based on the signal that has passed through the phase shifting means, respectively, and the received carrier signal having a higher reception level or received data is Since an error-free signal is adopted, the carrier signal can be received in a stable state even when the ground impedance of the power distribution system decreases. Further, if a plurality of phase shift means are provided, it is possible to further increase the stability of received information.
第１図は本発明の一実施例を示す全体構成図、第２図は
第１図に示す装置の作用を説明するための波形図、第３
図は位相とレベルとの関係を示す特性図、第４図及び第
５図はそれぞれ複数の移相回路を設けたときの要部構成
図、第６図は復調回路を単一の回路で構成した場合の要
部構成図、第７図は配電系統に絶縁劣化が生じないとき
の零相等価回路図、第８図は配電系統に絶縁劣化が生じ
たときの零相等価回路図である。 10,12,14……配電線、16……送信装置、18……受信装
置、30……ベクトル合成器、32,38……同期検波回路、3
4,40……復調回路、36……移相回路、42……比較回路、
44……切換スイッチ。FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a waveform diagram for explaining the operation of the apparatus shown in FIG.
FIG. 4 is a characteristic diagram showing the relationship between phase and level, FIGS. 4 and 5 are main part configuration diagrams when a plurality of phase shift circuits are provided, and FIG. 6 is a demodulation circuit configured as a single circuit. FIG. 7 is a zero-phase equivalent circuit diagram when insulation deterioration does not occur in the distribution system, and FIG. 8 is a zero-phase equivalent circuit diagram when insulation deterioration occurs in the distribution system. 10, 12, 14 ... distribution line, 16 ... transmission device, 18 ... reception device, 30 ... vector combiner, 32, 38 ... synchronous detection circuit, 3
4,40 demodulation circuit, 36 phase shift circuit, 42 comparison circuit
44… Changeover switch.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H02J 13/00 - 13/00 311 H04B 3/54 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) H02J 13/00-13/00 311 H04B 3/54
Claims (12)
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、主
検波手段出力の検波信号の中から直流成分のみを抽出し
て復調信号を出力する主復調手段と、三相配電線の基準
相の信号の位相を移相する移相手段と、移相手段の出力
信号と零相電圧検出手段の検出出力とを積算して検波信
号を出力する副検波手段と、副検波手段出力の検波信号
の中から直流成分のみを抽出して復調信号を出力する副
復調手段と、主復調手段と副復調手段の各復調信号のレ
ベルを比較し、レベルの高い復調信号を選択して出力す
る選択手段とを有する配電線搬送信号受信装置。1. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a detection of a reference phase signal transmitted by a carrier signal and the zero-phase voltage detecting means in the three-phase distribution line. A main detection means for integrating the output and outputting a detection signal, a main demodulation means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal, and a reference phase of a three-phase distribution line. A phase shifter for shifting the phase of the signal; a sub-detector for integrating the output signal of the phase shifter and a detection output of the zero-phase voltage detector to output a detection signal; A sub-demodulation means for extracting only a DC component from the output and outputting a demodulated signal; and a selection means for comparing the levels of the respective demodulated signals of the main demodulation means and the sub-demodulation means and selecting and outputting a demodulated signal having a high level. A distribution line carrier signal receiving device having the same.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、主
検波手段出力の検波信号の中から直流成分のみを抽出し
て復調信号を出力する主復調手段と、三相配電線の基準
相の信号の位相を順次移相する複数の移相手段と、各移
相手段の出力信号と零相電圧検出手段の検出出力とをそ
れぞれ積算して検波信号を出力する複数の副検波手段
と、各副検波手段出力の検波信号の中から直流成分のみ
を抽出して復調信号を出力する複数の副復調手段と、主
復調手段と各副復調手段の各復調信号のレベルを比較し
て、最大レベルの復調信号のみを選択する選択手段とを
有する配電線搬送信号受信装置。2. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a detection of a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means in the three-phase distribution line. A main detection means for integrating the output and outputting a detection signal, a main demodulation means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal, and a reference phase of a three-phase distribution line. A plurality of phase shifting means for sequentially shifting the phase of the signal, a plurality of sub-detecting means for integrating the output signal of each phase shifting means and the detection output of the zero-phase voltage detecting means and outputting a detection signal, A plurality of sub-demodulation means for extracting only the DC component from the detection signal output from the sub-detection means and outputting a demodulated signal, and comparing the levels of the demodulated signals of the main demodulation means and the sub-demodulation means with the maximum level Distribution line having selecting means for selecting only the demodulated signal of the distribution line The receiving device.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、主
検波手段出力の検波信号の中から直流成分のみを抽出し
て復調信号を出力する主復調手段と、三相配電線の基準
相の信号の位相を相異なる位相に移相する複数の移相手
段と、各移相手段の出力信号と零相電圧検出手段の検出
出力とをそれぞれ積算して検波信号を出力する複数の副
検波手段と、各副検波手段出力の検波信号の中から直流
成分のみを抽出して復調信号を出力する複数の副復調手
段と、主復調手段と副復調手段の各復調信号のレベルを
比較して、最大レベルの復調信号のみを選択する選択手
段とを有する配電線搬送信号受信装置。3. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of the three-phase distribution line, and a detection of the reference phase signal transmitted by the carrier signal and the zero-phase voltage detecting means in the three-phase distribution line. A main detection means for integrating the output and outputting a detection signal, a main demodulation means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal, and a reference phase of a three-phase distribution line. A plurality of phase shifting means for shifting the phase of the signal to a different phase, and a plurality of sub-detecting means for integrating the output signal of each phase shifting means and the detection output of the zero-phase voltage detecting means to output a detection signal And a plurality of sub-demodulation means for extracting only the DC component from the detection signal output from each sub-detection means and outputting a demodulated signal, and comparing the levels of the respective demodulated signals of the main demodulation means and the sub-demodulation means, Selecting means for selecting only the maximum level demodulated signal Carrier signal receiving apparatus.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、主
検波手段出力の検波信号の中から直流成分のみを抽出し
て復調信号を出力する主復調手段と、三相配電線の基準
相の信号の位相を移相する移相手段と、移相手段の出力
信号と零相電圧検出手段の検出出力とを積算して検波信
号を出力する副検波手段と、副検波手段出力の検波信号
の中から直流成分のみを抽出して復調信号を出力する副
復調手段と、主復調手段と副復調手段から復調信号を取
り込んで、各復調信号の誤り検定を行い、正常な復調信
号のみを選択する配電線搬送信号受信装置。4. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a signal of a reference phase transmitted by a carrier signal of the three-phase distribution line and detection of the zero-phase voltage detecting means. A main detection means for integrating the output and outputting a detection signal, a main demodulation means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal, and a reference phase of a three-phase distribution line. A phase shifter for shifting the phase of the signal; a sub-detector for integrating the output signal of the phase shifter and a detection output of the zero-phase voltage detector to output a detection signal; A sub-demodulation unit that extracts only a DC component from the inside and outputs a demodulated signal, fetches demodulated signals from a main demodulation unit and a sub-demodulation unit, performs an error test on each demodulated signal, and selects only a normal demodulated signal. Distribution line carrier signal receiver.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、主
検波手段出力の検波信号の中から直流成分のみを抽出し
て復調信号を出力する主復調手段と、三相配電線の基準
相の信号の位相を順次移相する複数の移相手段と、各移
相手段の出力信号と零相電圧検出手段の検出出力とをそ
れぞれ積算して検波信号を出力する複数の副検波手段
と、各副検波手段出力の検波信号の中から直流成分のみ
を抽出して復調信号を出力する複数の副復調手段と、主
復調手段と各副復調手段から復調信号を取り込んで各復
調信号の誤り検定を行い、正常な復調信号のみを選択す
る選択手段とを有する配電線搬送信号受信装置。5. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a signal of a reference phase transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line. A main detection means for integrating the output and outputting a detection signal, a main demodulation means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal, and a reference phase of a three-phase distribution line. A plurality of phase shifting means for sequentially shifting the phase of the signal, a plurality of sub-detecting means for integrating the output signal of each phase shifting means and the detection output of the zero-phase voltage detecting means and outputting a detection signal, A plurality of sub-demodulation means for extracting a DC component from the detection signal output from the sub-detection means and outputting a demodulated signal, and taking in demodulated signals from the main demodulation means and each sub-demodulation means to perform an error test on each demodulated signal. And a selecting means for selecting only a normal demodulated signal. Distribution line carrier signal receiving apparatus.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、主
検波手段出力の検波信号の中から直流成分のみを抽出し
て復調信号を出力する主復調手段と、三相配電線の基準
相の信号の位相を相異なる位相に移相する複数の移相手
段と、各移相手段の出力信号と零相電圧検出手段の検出
出力の検波信号の中から直流成分のみを抽出して復調信
号を出力する複数の副復調手段と、主復調手段と各副復
調手段から復調信号を取り込んで各復調信号の誤り検定
を行い、正常な復調信号のみを選択する選択手段とを有
する配電線搬送信号受信装置。6. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a detection of a reference phase signal transmitted by a carrier signal and the zero-phase voltage detecting means in the three-phase distribution line. A main detection means for integrating the output and outputting a detection signal, a main demodulation means for extracting only a DC component from the detection signal output from the main detection means and outputting a demodulated signal, and a reference phase of a three-phase distribution line. A plurality of phase shifting means for shifting the phase of the signal to different phases, and extracting only a DC component from a detection signal of an output signal of each phase shifting means and a detection output of the zero-phase voltage detecting means, thereby demodulating a demodulated signal. Distribution line carrier signal reception having a plurality of sub-demodulation means for outputting, and a selection means for taking in demodulated signals from the main demodulation means and each sub-demodulation means, performing an error test on each demodulated signal, and selecting only a normal demodulated signal. apparatus.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、三
相配電線の基準相の信号を取り込み、こ信号の位相を移
相する移相手段と、移相手段の出力信号と零相電圧検出
手段の検出出力とを積算して検波信号を出力する副検波
手段と、主検波手段出力の検波信号と副検波手段出力の
検波信号のうち指令に応じて検波信号を選択して出力す
る選択手段と、選択手段出力の検波信号の中から直流成
分のみを抽出して復調信号を出力する復調手段と、復調
信号のレベルを監視して、復調信号のレベルが設定レベ
ル以下となるまでは主検波手段出力の検波信号の選択
を、それ以外のときには副検波手段出力の検波信号の選
択を選択手段に対して指令する選択指令手段とを有する
配電線搬送信号受信装置。7. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a detection of a reference phase signal transmitted by a carrier signal and the zero-phase voltage detecting means in the three-phase distribution line. Main detection means for integrating the output to output a detection signal, phase shift means for taking in the signal of the reference phase of the three-phase distribution line and shifting the phase of this signal, output signal of the phase shift means and zero-phase voltage A sub-detection unit that integrates the detection output of the detection unit and outputs a detection signal; and a selection that selects and outputs a detection signal according to a command from the detection signal of the main detection unit output and the detection signal of the sub-detection unit output Means, a demodulating means for extracting only a DC component from a detection signal output from the selecting means and outputting a demodulated signal, and monitoring a level of the demodulated signal until the level of the demodulated signal becomes equal to or lower than a set level. When the detection signal output from the detection means is selected, Distribution line carrier signal receiving apparatus and a selection command means for commanding the selection of the detection signal of the sub-detecting means outputs the selection means.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、三
相配電線の基準相の信号の位相を段階的に順次移相して
出力する複数の移相手段と、各移相手段の出力信号と零
相電圧検出手段の検出出力とをそれぞれ積算して検波信
号を出力する複数の副検波手段と、主検波手段出力の検
波信号と各副検波手段出力の検波信号のうち単一の検波
信号を指令により選択する選択手段と、選択手段出力の
検波信号の中から直流成分のみを抽出して復調信号を出
力する復調手段と、復調信号のレベルを監視して、復調
信号のレベルが設定レベル以下となるまでは主検波手段
出力の検波信号の選択を、復調信号のレベルが設定レベ
ル以下となる毎に基準相の信号よりも位相差が大きくな
る移相手段からの信号に基づく検波信号の選択を順次選
択手段に対して指令する選択指令手段とを有する配電線
搬送信号受信装置。8. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a signal of a reference phase transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line. Main detection means for integrating the output and outputting a detection signal, a plurality of phase shift means for sequentially shifting the phase of the signal of the reference phase of the three-phase distribution line in a stepwise manner, and outputs of each phase shift means A plurality of sub-detection means for integrating the signal and the detection output of the zero-phase voltage detection means to output a detection signal; a single detection signal out of the detection signal of the main detection means and the detection signal of each sub-detection means Selecting means for selecting a signal by a command, demodulating means for extracting only a DC component from a detection signal output from the selecting means and outputting a demodulated signal, monitoring the level of the demodulated signal, and setting the level of the demodulated signal Until the level falls below the level, the detection signal Selection command means for sequentially instructing the selection means to select a detection signal based on a signal from the phase shift means in which the phase difference becomes larger than the reference phase signal every time the level of the demodulated signal falls below the set level. And a distribution line carrier signal receiving device.
を検出する零相電圧検出手段と、三相配電線のうち搬送
信号が伝送する基準相の信号と零相電圧検出手段の検出
出力とを積算して検波信号を出力する主検波手段と、三
相配電線の基準相の信号をそれぞれ取り込み、この信号
の位相を相異なる位相に移相して出力する複数の移相手
段と、各位相手段の出力信号と零相電圧検出手段の検出
出力とをそれぞれ積算して検波信号を出力する複数の副
検波手段と、主検波手段出力の検波信号と各副検波手段
出力の検波信号のうち単一の検波信号を指令により選択
する選択手段と、選択手段出力の検波信号の中から直流
成分のみを抽出して復調信号を出力する復調手段と、復
調信号のレベルを監視して、復調信号のレベルが設定レ
ベル以下となるまでは主検波手段出力の検波信号の選択
を、復調信号のレベルが設定レベル以下となる毎に基準
相の信号よりも位相差が大きくなる移相手段からの信号
に基づく検波信号の選択を順次選択手段に対して指令す
る選択指令手段とを有する配電線搬送信号受信装置。9. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a detection of a reference phase signal transmitted by a carrier signal and the zero-phase voltage detecting means in the three-phase distribution line. Main detection means for integrating the output and outputting a detection signal, and a plurality of phase shift means for taking in the signal of the reference phase of the three-phase distribution line, shifting the phase of this signal to a different phase, and outputting the same, A plurality of sub-detection means for integrating the output signal of each phase means and the detection output of the zero-phase voltage detection means to output a detection signal; a detection signal of a main detection means output and a detection signal of a sub-detection means output; Selecting means for selecting a single detected signal by a command, demodulating means for extracting only a DC component from the detected signal output from the selecting means and outputting a demodulated signal, monitoring the level of the demodulated signal and demodulating Until the signal level falls below the set level Selects the detection signal output from the main detection means, and sequentially selects the detection signal based on the signal from the phase shift means that the phase difference becomes larger than the reference phase signal every time the demodulated signal level falls below the set level. And a selection command means for commanding the means.
圧を検出する零相電圧検出手段と、三相配電線のうち搬
送信号が伝送する基準相の信号と零相電圧検出手段の検
出出力とを積算して検波信号を出力する主検波手段と、
三相配電線の基準相の信号を取り込み、この信号の位相
を移相する移相手段と、移相手段の出力信号と零相電圧
検出手段の検出出力とを積算して検波信号を出力する副
検波手段と、主検波手段出力の検波信号と副検波手段出
力の検波信号のうち指令に応じて検波信号を選択して出
力する選択手段と、選択手段出力の検波信号の中から直
流成分のみを抽出して復調信号を出力する復調手段と、
復調信号の誤りを検定を行い、正常な復調信号が得られ
る検波信号の選択を選択手段に対して指令する選択指令
手段とを有する配電線搬送信号受信装置。10. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line. Main detection means for integrating the output and outputting a detection signal,
A phase shifter for taking in the signal of the reference phase of the three-phase distribution line and shifting the phase of the signal, and a sub-output for integrating the output signal of the phase shifter and the detection output of the zero-phase voltage detector to output a detection signal. Detecting means, selecting means for selecting and outputting a detection signal according to a command among the detection signal output from the main detection means and the detection signal output from the sub-detection means, and selecting only a DC component from the detection signal output from the selection means. Demodulation means for extracting and outputting a demodulated signal;
A distribution line carrier signal receiving apparatus, comprising: a selection commanding unit that tests an error of a demodulated signal and selects a detection signal from which a normal demodulated signal can be obtained.
圧を検出する零相電圧検出手段と、三相配電線のうち搬
送信号が伝送する基準相の信号と零相電圧検出手段の検
出出力とを積算して検波信号を出力する主検波手段と、
三相配電線の基準相の信号の位相を段階的に順次移相し
て出力する複数の移相手段と、各位相手段の出力信号と
零相電圧検出手段の検出出力とをそれぞれ積算して検波
信号を出力する複数の副検波手段と、主検波手段出力の
検波信号と各副検波手段出力の検波信号のうち単一の検
波信号を指令により選択する選択手段と、選択手段出力
の検波信号の中から直流成分のみを抽出して復調信号を
出力する復調手段と、復調信号の誤りを検定を行い、正
常な復調信号が得られる検波信号の選択を選択手段に対
して指令する選択指令手段とを有する配電線搬送信号受
信装置。11. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a detection of a reference phase signal transmitted by a carrier signal and the zero-phase voltage detecting means in the three-phase distribution line. Main detection means for integrating the output and outputting a detection signal,
A plurality of phase shifting means for sequentially shifting the phase of the signal of the reference phase of the three-phase distribution line in a stepwise manner, and integrating and detecting the output signal of each phase means and the detection output of the zero-phase voltage detecting means, respectively. A plurality of sub-detection means for outputting a signal, a selection means for selecting a single detection signal from a detection signal output from the main detection means and a detection signal output from each sub-detection means by a command, and a detection signal output from the selection means. Demodulating means for extracting a DC component from the output of the demodulated signal and outputting a demodulated signal, and selecting command means for testing an error of the demodulated signal and instructing the selecting means to select a detection signal from which a normal demodulated signal is obtained. A distribution line carrier signal receiving device having the same.
圧を検出する零相電圧検出手段と、三相配電線のうち搬
送信号が伝送する基準相の信号と零相電圧検出手段の検
出出力とを積算して検波信号を出力する主検波手段と、
三相配電線の基準相の信号をそれぞれ取り込み、この信
号の位相を相異なる位相に移相して出力する複数の移相
手段と、各位相手段の出力信号と零相電圧検出手段の検
出出力とをそれぞれ積算して検波信号を出力する複数の
副検波手段と、主検波手段出力の検波信号と各副検波手
段出力の検波信号のうち単一の検波信号を指令により選
択する選択手段と、選択手段出力の検波信号の中から直
流成分のみを抽出して復調信号を出力する復調手段と、
復調信号の誤りを検定を行い、正常な復調信号が得られ
る検波信号の選択を選択手段に対して指令する選択指令
手段とを有する配電線搬送信号受信装置。12. A zero-phase voltage detecting means for detecting a zero-phase voltage from a voltage signal of each phase of a three-phase distribution line, and a reference phase signal transmitted by a carrier signal and a zero-phase voltage detecting means of the three-phase distribution line. Main detection means for integrating the output and outputting a detection signal,
A plurality of phase shifting means for taking in the signal of the reference phase of the three-phase distribution line, shifting the phase of this signal to a different phase, and outputting the output signal of each phase means and the detection output of the zero-phase voltage detecting means. A plurality of sub-detecting means for respectively integrating and outputting a detection signal, a selection means for selecting a single detection signal from a detection signal output from the main detection means and a detection signal output from each sub-detection means by a command, selecting Demodulating means for extracting only a DC component from a detection signal of the means output and outputting a demodulated signal,
A distribution line carrier signal receiving apparatus, comprising: a selection commanding unit that tests an error of a demodulated signal and selects a detection signal from which a normal demodulated signal can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1263627A JP2903090B2 (en) | 1989-10-09 | 1989-10-09 | Distribution line carrier signal receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1263627A JP2903090B2 (en) | 1989-10-09 | 1989-10-09 | Distribution line carrier signal receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03128634A JPH03128634A (en) | 1991-05-31 |
| JP2903090B2 true JP2903090B2 (en) | 1999-06-07 |
Family
ID=17392145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1263627A Expired - Fee Related JP2903090B2 (en) | 1989-10-09 | 1989-10-09 | Distribution line carrier signal receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2903090B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010278759A (en) * | 2009-05-28 | 2010-12-09 | Mitsubishi Electric Corp | Water distribution management communication system |
-
1989
- 1989-10-09 JP JP1263627A patent/JP2903090B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03128634A (en) | 1991-05-31 |
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