JPH09181850A - Protective relay device having loop type data transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the device by separating the function of telephone voice data transmission into a transmission exclusive function for an outgoing system and a reception exclusive function for an incoming system. SOLUTION: The outgoing system is provided with a telephone voice transmission data multiplexer section 10 with a transmission function by a demultiplexer/ multiplexer of telephone voice data from a data frame, a transmission microphone 13, an adder means 14, and the incoming system is provided with a telephone voice reception data section 20 with a reception function by a demultiplexer 21 of telephone voice data from a data frame, and a reception speaker 23. Thus, the telephone voice data transmission for the protection relay device with a loop form data transmission line is realized by separating the transmission function and the reception function and using them exclusively with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay device having a loop type data transmission path, and more particularly to a device having a telephone function added by multiplexing telephone voice data.

[0002]

2. Description of the Related Art In a protective relay device having a loop type data transmission path, a master station cyclically creates a data frame and transmits the data to an intermediate station, and the intermediate station transmits its own measurement data to The multiplexed data is transmitted on the received data frame to the next intermediate station or return station.

FIG. 3 is a conceptual diagram of a protective relay device having this loop type data transmission path. Station A is a master station, stations B, C and D are intermediate stations, and station E is a return station. In the figure, the data flow is in the order of A station → B station → C station → D station → E station. (This data flow is referred to as "downstream system.") The return station (E station) performs an operation using the data on the received data frame and the measurement data of its own station. Also, the measurement data of the own station is calculated using the data frame transmitted from the D station, and the data is transmitted to the next intermediate station or the master station. The flow of data from the return station E station is in the order of E station → D station → C station → B station → A station.
(This data flow is called "upstream".) The master station (station A) receives upstream data received from station B.
Perform an operation using the data on the frame and discard the data frame.

In the loop data transmission system as described above, it has been attempted to multiplex "telephone voice data" on a data frame to provide a telephone function. As a means for realizing this telephone function, the system shown in FIG. 4 can be considered.

FIG. 4 is a block diagram having a telephone voice data demultiplexing / multiplexing function, and reference numerals 30 and 30 'show the telephone voice data demultiplexing / multiplexing units of the downstream system and the upstream system, respectively. The downstream telephone voice data separation unit 30 receives the data frame transmitted from the station preceding the certain station (own station) by the telephone voice data separation unit 31, and the telephone voice data on the received data frame. To separate. Here, the separated telephone voice data (digital data) is transferred to the D / A converter 32.
Is converted into analog data and is output as analog voice data via the handset (speaker) 33 as voice that can be heard by humans.

At the same time, the addition circuit 35 adds analog voice data obtained by converting the telephone voice transmission data from the local transmitter (microphone) 34 by the D / A converter 32. The analog voice data added by the adder circuit 35 is analog-digital converted by the A / D converter 36, and is converted to telephone data from the local station by the transmission data multiplexer 37.
It is multiplexed with the telephone voice data part on the frame and transmitted to the next station in the downstream system.

The above is the telephone voice data demultiplexing / multiplexing unit 30 for the downlink system, but the telephone voice data demultiplexing / multiplexing unit 30 'having the same configuration is also provided for the upstream system. In the components of the telephone voice data demultiplexing / multiplexing unit 30 ', the same components as those of the downlink telephone voice data demultiplexing / multiplexing unit 30 are denoted by the same reference numerals, and a dash is added to the same. The description is omitted.

[0008]

As described above, in the protective relay device having the loop type data transmission line as shown in FIG. 3, any one of the stations A to E can realize the telephone function. In order to achieve this, telephone voice data separation /
It is necessary to provide a multiplex section.

That is, when only the downlink system has a telephone function, the voice transmitted by the A station can be received by all the stations B to E, but the voice transmitted by the C station is the A station. B station cannot receive the call. If only the upstream system has a telephone function, the voice transmitted by the E station can be received by all the stations D to A, but the voice transmitted by the C station can be received by the E and D stations. I can't listen. This is because the data created and transmitted by station A returns to station A and is discarded.

As described above, in order to provide the telephone function in any of the stations A to E, the device shown in FIG. 4 requires two devices for the downstream system and the upstream system. It becomes an uneconomical device because it requires four talkers and receivers, and extra circuits are required.

In view of the above points, an object of the present invention is to simplify the apparatus by dividing the function related to telephone voice data transmission into a transmission-only function for the downstream system and a reception-only function for the upstream system. is there.

[0012]

According to the present invention, a function relating to telephone voice data transmission is divided into a downstream system and an upstream system so that the downstream system has a transmission-only function and the upstream system has a reception-only function. It is characterized by what it did.

That is, the master station, the intermediate station, and the return station are linked in a loop through a data transmission path, and the data flow is from the master station to the return station via the intermediate station and from the return station to the downlink system. In the reverse system, the master station cyclically creates a data frame and sends the data to the intermediate station, and the intermediate station receives the received data frame. Multiplex the measurement data of your own station on top,
Data is transmitted to the next intermediate station or return station, and in the upstream system, the return station performs calculation using the data on the received data frame and the measurement data of its own station, and the measurement data of its own station Of the intermediate station, the data frame transmitted from the intermediate station is transmitted to the intermediate station at the preceding stage, and the other intermediate stations receiving this data are
In a protective relay device that has a loop-type data transmission path that performs calculations using the data on the received data frame and sends the data to the next intermediate station or master station, the telephone voice data transmission The functions are divided into the system and the upstream system, and the downstream system has the multiplex transmission function of telephone voice transmission data and the upstream system has the reception function of telephone voice data.

The telephone voice transmission data multiplexing section having the telephone voice transmission data multiplexing function described above receives the data frame transmitted from the preceding station in the downstream system, and receives the data frame. From the telephone voice data area above, a telephone voice data separation unit for separating digital telephone voice data, a D / A conversion unit for converting the separated digital data into analog data, and A transmitter for transmitting analog telephone voice transmission data, and the voice transmission data of this transmitter and the analog telephone voice data up to the preceding station obtained by the D / A conversion unit are added. An adder circuit and A / A that converts the analog data resulting from the addition in the adder circuit into digital data
Transmission data to be multiplexed to the telephone data area of the transmission data frame by the D conversion section and the digital telephone voice data converted by the A / D conversion section, and transmitted to the downstream downstream station. It is composed of a multiplexing section.

Further, the telephone voice data receiver having the telephone voice data receiving function receives the data frame transmitted from the upstream station in the upstream system, and the telephone voice data area on the data frame is received. , A telephone voice data separation unit for separating voice data for digital telephones, a D / A conversion unit for converting the separated voice data for digital telephones into analog data, and a D / A conversion unit for conversion. It is composed of a receiver which outputs the voice data for analog telephone obtained as a voice.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of telephone voice data separation / multiplexing according to the present invention. As shown in FIG. 1, the present invention shows a telephone voice transmission data multiplexing unit 1 for telephones having a transmission function in a downstream system.
0, and a telephone voice data receiving unit 20 having a receiving function on the upstream side.

The telephone voice transmission data multiplexing unit 10 receives the data frame transmitted from the preceding station in the downstream system, and separates the digital telephone voice data from the telephone voice data area on the data frame. Telephone voice data separating section 11 and a D / A converting section 12 for converting the separated digital data into analog data
And a transmitter (microphone) 13 for transmitting analog telephone voice transmission data from its own station, voice transmission data of the transmitter 13 and the preceding stage obtained by the D / A conversion unit 12. Adder circuit 14 for adding analog telephone voice data up to the station, an A / D converter 15 for analog-digital conversion of the addition result of the adder circuit 14, and the A / D converted digital telephone voice. A transmission data multiplexing unit 16 that multiplexes data in a telephone voice data area on a transmission data frame and transmits it to a station in the subsequent downstream system, and has a multiplex transmission function of telephone voice transmission data. Is equipped with.

The telephone voice data receiver 20 receives the data frame transmitted from the upstream station in the upstream system and separates the digital telephone voice data from the telephone voice data area on the data frame. Telephone voice data separation unit 21, D / A conversion unit 22 for converting the separated digital telephone voice data into digital / analog, and analog telephone voice data obtained by conversion by the D / A conversion unit 22. And a receiver (speaker) 23 for outputting as voice, and has a function of receiving telephone voice data.

Next, the downstream system (A station → B station → C station → D station →
The telephone function of the E station) and the telephone function of the upstream system (E station → D station → C station → B station → A station) will be described.

(1) Regarding the multiplex transmission function of the voice transmission data for the telephone of the downlink system [Station A] The analog voice transmission data for the telephone is A / D converted to the telephone voice data area on the data frame. , And carries voice data for digital telephone to station B for transmission.

[Stations B to D] Each station is a preceding station (Stations A to
The data frame transmitted from the station C) is received by the telephone voice data separation unit 11, the digital telephone voice data is separated from the telephone voice data area on the data frame, and the D / A conversion unit 12 digitally receives the digital voice data. -Analog conversion of the analog telephone voice transmission data from the transmitter 13 of the own station and the analog telephone voice data up to the preceding station obtained by conversion in the D / A conversion unit 12 Adder circuit 14
In the A / D conversion unit 15 performs analog-to-digital conversion, and the transmission data multiplexing unit 16 multiplexes the digital telephone voice data in the telephone voice data area on the transmission data frame. And send it to stations C to E.

[Station E] The data frame transmitted from the station D is received by the telephone voice data separating unit 11, and the digital telephone voice data is separated from the telephone voice data area on the data frame. The A / A conversion unit 12 converts the analog data to analog data, and the analog telephone voice transmission data from the transmitter 13 of the own station is added by the addition circuit 14, and the addition result is A / D. Through the conversion unit 15, the transmission data multiplexing unit 16 multiplexes the digital voice and the telephone voice into the telephone voice data area on the transmission data frame and transmits them to the D station.
The data frame transmitted from the station is received by the telephone voice data receiving unit 20, the digital telephone voice data is separated from the telephone voice data area on the data frame by the telephone voice data separating unit 21, and D / The A converter 22 converts the analog data into analog data, and the obtained analog telephone voice data is output from the handset 23.

(2) Reception function for upstream telephone voice data [Station D to Station B] The telephone voice data separation unit 20 receives the data frames transmitted from the preceding stations (Stations E to C). The received voice data for telephone calls is separated from the telephone voice data area on the data frame by the telephone voice data separation section 21 and is digital-analog converted by the D / A conversion section 22. The voice data is output from the handset 23 as voice.

When transmitting the telephone voice data to the stations (stations C to A) in the latter stage, the telephone voice data transmitted from the stations (stations E to C) in the former stage are transmitted as they are.

[Station A] The data frame transmitted from station B is received by the telephone voice data separation unit 21, and the digital telephone voice data is separated from the telephone voice data area on the data frame. The A / A converter 22 converts the analog voice data and outputs the analog telephone voice data from the handset (speaker) 23. Then, the received data frame is discarded.

As described above, according to the present invention, in the downstream system, the data frame is separated from the telephone voice data, the microphone for multiplexing and transmission, the addition function, and in the downstream system, the telephone voice data is separated from the data frame, and the reception The speaker function and the functions are separated and dedicated to realize telephone voice data transmission of a protective relay device having a loop-type data transmission path.

FIG. 2 is a conceptual diagram in the case where the present invention is applied to a protective relay device having a loop type data transmission line in which a backup transmission line is considered, which is provided with a backup transmission line as shown by a dotted line. When the transmission path is disconnected, for example, when the transmission path between the downstream B station and C station is disconnected, station C becomes the master station, creates a transmission frame, transmits it to station D, transmits it to station D, The stations E and A are intermediate stations, and the station B serves as a return station, so that each station can receive telephone voice data at all stations.

[0028]

As described above, according to the present invention, in the protective relay device having the loop type data transmission path, the functions of telephone voice data transmission are divided into "downstream" and "upstream". Is obtained.

(1) It is not necessary for each station to have a telephone voice data separation / multiplexing function as shown in FIG. 4 in both the downstream and upstream systems, and telephone communication can be realized with a simple device.

(2) At each station, a pair of telephone transmitter and receiver may be prepared for each station.

(3) By providing a transmission line backup system as shown in FIG. 2, telephone voice data can be transmitted even if a certain transmission line is broken.

(4) In the downstream system, after converting the telephone voice data into analog voice data, the analog telephone voice data from the own station is added and again converted into digital voice data, which is then transmitted on the transmission data frame. Since multiplexing is performed, N: N conversation between stations is possible through the telephone.

[Brief description of the drawings]

FIG. 1 is a block diagram of telephone voice data separation / multiplexing according to the present invention.

FIG. 2 is a conceptual diagram of an application example of the present invention to a circuit having a backup transmission line.

FIG. 3 is a conceptual diagram of a protective relay device having a loop data transmission path.

FIG. 4 is a conventional telephone voice data separation / multiplexing block diagram.

[Explanation of symbols]

 10 ... Voice transmission data multiplexing unit for telephone 20 ... Voice data receiving unit for telephone 11, 21 ... Voice data separating unit for telephone 12, 22 ... D / A conversion unit 13 ... Transmitter 14 ... Addition circuit 15 ... A / D conversion unit 16 ... Transmission data multiplexing unit 23 ... Handset

Claims (3)

[Claims] 1. A master station, an intermediate station, and a loopback station are linked in a loop through a data transmission path, and a data flow is a downlink system from the master station to the loopback station via an intermediate station and a loopback station to a downlink system. And the upstream system that returns to the master station in the opposite direction,
In the downlink system, the master station cyclically creates a data frame and transmits the data to the intermediate station, and the intermediate station multiplexes the measurement data of its own station on the received data frame, and the next intermediate station or Sends data to the loopback station, and in the upstream system, the loopback station calculates using the data on the received data frame and the measurement data of the local station, and also transmits the measurement data of the local station from the intermediate station in the previous stage. The transmitted data frame is multiplexed with the received data frame and transmitted to the intermediate station at the preceding stage, and the other intermediate stations receiving this data perform an operation using the data on the received data frame, and then In a protective relay device having a loop type data transmission line adapted to transmit data to an intermediate station or a master station, telephone voice data transmission is divided into a downstream system and an upstream system.
A protective relay device with a loop-type data transmission line characterized in that each station is provided with a multiplex transmission function for telephone voice transmission data in the downstream system and an upstream system with a reception function for telephone voice data. 2. A telephone voice transmission data multiplexer having a telephone voice transmission data multiplex transmission function receives a data frame transmitted from a preceding station in a downstream system, and receives the data frame on the data frame. A telephone voice data separation unit that separates digital telephone voice data from the telephone voice data area, a D / A conversion unit that converts the separated digital data into analog data, and an analog signal from the own station. A transmitter for transmitting telephone voice transmission data, and an adder circuit for adding the voice transmission data of the transmitter and the analog telephone voice data up to the preceding station obtained by the D / A converter. And an A / D converter that converts the analog data resulting from the addition by the adder circuit into digital data,
And a transmission data multiplexing unit for multiplexing the digital telephone voice data converted by the A / D conversion unit in the telephone voice data area on the transmission data frame and transmitting the same to the subsequent station in the downstream system. A protective relay device having a loop type data transmission line according to claim 1. 3. A telephone voice data receiver having a telephone voice data receiving function receives a data frame transmitted from a station in the upstream upstream stage, and a telephone voice data area on the data frame. A telephone voice data separation unit for separating the digital telephone voice data from the digital telephone, a D / A conversion unit for converting the separated digital telephone voice data into analog data, and a D / A conversion unit for conversion. 2. A protective relay device having a loop type data transmission line according to claim 1, further comprising a receiver for outputting the obtained voice data for analog telephone as voice.