FR2596903A1 - EQUIPMENT FOR FACILITATING THE REMOTE CONTROL OF A POWER CONTROL DEVICE FOR A DATA TRANSMISSION LINK - Google Patents

Abstract

EQUIPMENT TO FACILITATE THE REMOTE CONTROL OF AN ENERGY REGULATION DEVICE FOR A LINK FOR DATA TRANSMISSION. IT INCLUDES AT LEAST ONE LINK CONNECTING REMOTE CONTROL A AND B CONTROL STATIONS, AND INCLUDING ISOLATION TRANSFORMERS 3, 4 TO THE RESPECTIVE A STATIONS, B AND TWO CONDUCTORS 1, 2 CONNECTING THESE STATIONS, HAVING A 5 CONDUCTOR SHIELD WITH CENTRAL TAP ON TRANSFORMER 3, 4 WINDINGS A DIRECT CURRENT OR LOW FREQUENCY ALTERNATIVE CIRCUIT REMOTE CONTROLS A REGULATOR 8 OF ENERGY SUPPLY FROM STATION B, TO CONNECT A MAIN ENERGY SUPPLY MS TO A DECODER TO DECODER AND ENABLE TRANSMISSION SIGNALS INDICATING THE STATUS OF THE POST. APPLICATION TO THE REMOTE CONTROL OF POSTS AND DATA TRANSMISSION CIRCUITS.

Description

The present invention relates to equipment for the transmission of

  data, and the invention relates more specifically to equipment for data transmission, facilitating the remote control of control devices and control of power on

  links for data transmission.

  According to the present invention, this provides a data transmission equipment, comprising at least one data transmission link extending between remote command and control stations, said link comprising isolation transformers present. at the respective stations and a pair of preferably twisted conductors extending between said stations, wherein there is a relatively low frequency direct current or alternating current power circuit for operating a remote control device and energy control, located at one or more stations controlled from the control station, for connecting a main power supply to a data decoding equipment and for enabling the transmission of status signals to the control station. control, and wherein said energy circuit includes parallel paths through the pair of conductors via central outlets on coils of the respective isolating transformers and a conductive shield for isolating and protecting said

twisted conductors.

  The invention will now be described in more detail, by way of illustration and in no way limitative, with reference to the accompanying drawings in which: FIG. 1 shows a conventional link for data transmission between remote control and controlled stations; FIG. 2 shows the link for data transmission, according to FIG. 1, adapted according to the invention for providing, with the aid of the data transmission link, energy intended to operate a remote control device. and power and power control FIG. 3 shows a link for transmission, between multiple stations, of data and energy, of the kind shown in FIG. 2; and FIG. 4 shows a connection according to the invention for transmitting data and transmitting energy.

in direct current.

  FIG. 1 shows a connection for the transmission of coded two-phase data between control remote stations A and control station B. The data link comprises two twisted conductors 1 and 2 having a grounded shield which are connected to alternating current at positions A and B

  by means of transformers 3 and 4 respectively 15 dc isolation.

  In FIG. 2, it can be seen that a low-frequency low-power power supply is supplied from a control station A to a remote controlled station B, to operate a device 8 for controlling and regulating energy at station B , via a power supply circuit comprising central points of engagement on the windings of the transformers 3 and 4, the pair of the conductors 1 and 2, the conductive shield 5, set to the

  earth, for the conductors 1 and 2, and the current transformers 6 and 7 at the respective A and B stations.

  The frequency of the alternating current supplied to operate the energy control and regulation device 8 at the station B may be up to about 1/5 of the frequency of the coded data, which may be between 25 and 100 kHz. As will be readily understood from the examination of FIG. 2, the current flowing in the power supply circuit is divided equally between the twisted conductors 1 and 2, which ensures

  high separation between the power signal and the data transmitted on the link for data transmission.

  FIG. 3 shows an arrangement similar to that of FIG. 2, but which comprises additional remote control stations C and DA: 4s-2596903 connected to the data transmission link and to the low-frequency power supply circuit for operation. energy control and regulation devices at stations C and D as well as at station B. FIG. 4 shows an assembly combining a link for energy transmission and a power supply or power supply circuit for supply AC power from station A to station B using the twisted pair of parallel-connected conductors, the assembly including the grounded shield for the protection of the transmission conductors

of data.

  The power control and regulation device 8, located at the remote station B or at the remote stations B, C and D, as the case may be, may comprise semiconductor switching devices and serves to connect a main current supply. or energy, MS, for example from a power supply network, to a decoding equipment DEC at the station (s) ordered to enter the station (s) ) corresponding to receive coded data to be transmitted, via the data link, from the station A, and to initiate the transmission of status signals thereto by the data link, to provide an indication that the remote station B, or the remote stations B, C and D, are or are capable of receiving transmitted data. As will be understood from the foregoing, the energy control and regulation device is remotely controlled by low frequency low power energy received via the data link conductors, and it is sufficient that the positive control and energy control dis35 is connected to a pole of the main power supply, for example from the network, to avoid the risk that this device for control and regulation of energy

  causes an internal short circuit, and also to ensure good electrical integrity.

  In the figures, - denotes a power supply

  alternating current and DC a DC power supply. It goes without saying that, without departing from the scope of the invention, many modifications can be made to the data transmission equipment, described and shown.

Claims (2)

  1. Equipment for data transmission, comprising at least one data transmission link extending between remote command and control stations, said data transmission link comprising isolation transformers placed at the respective stations and a pair of conductors extending between said stations, characterized in that it comprises a relatively low frequency DC or AC circuit for operating a remote energy control or regulation device placed in one or more station (s) controlled from the control station (A) for connecting a main power supply to a data decoding equipment (DEC) and for transmitting signals indicative of the status of the station equipment in which the power supply circuit comprises parallel paths (1, 2) passing through the pair of conductors using central outlets on windings of the respective isolation transformers (3, 4),   a conductive shield (5) for protecting the data transmission conductors (1, 2).   2. Equipment for data transmission according to claim 1, characterized in that the link for data transmission comprises a pair of twisted conductors (1, 2).