A excellent data communication process to transmit the control commands and data between Distribution manipulate Centre (DCC) and a large quantity of device remotely located on the distribution network is a pre-requisite for the great performance of Distribution Automation method (DAS). The communique requirements of every DAS is unique, relying upon the Distribution Automation features chosen for the implementation. A vast variety of communication technologies are to be had to participate in the tasks of DAS. The choice of communication technological know-how also has a enormous have an impact on on the fee of DAS. RTU’s be in contact with the manage room by means of a conversation interface, which would be any of the following :
(a) Power line carrier communication (PLCC) :
Each finish of the transmission line is provided with same service gear in the frequency range of 30 to 500 kHz. The high frequency signals are transmitted by means of energy strains. The provider present equipment compromises the coupling capacitor and the tuning circuit.
(b) Fibre optics data communication :
Utility of fibre optic communique is right now in infant stage and has a substantial scope as a result of freedom from electromagnetic interference and huge information handling ability of a single pair of optical fibre. The understanding is exchanged in the type of digitised gentle alerts transmitted via optical fibres. Fibre optics, with its specific downward rate development in terms of product as well as set up and protection fees has end up a generally authorized alternative, as it offers each technical and commercial advantages over conventional techniques that use metal cables and radio links. The conversation clearly contains a transmitter and a receiver for information indicators coming from the user’s device which is attached by way of copper wire to the switching core or exchange, the place it is changed right into a digital sign like 1s or 0 s for effortless dealing with.
(c) Radio communication :
Radio conversation utilizes frequency bands between eighty five MHz to 13 GHz, factor to point radio hyperlinks, Multi terminal radio conversation facility, restrained subject radio scheme, cell radio sets, Emergency radio communique etc. Are the forms of radio verbal exchange services used in electrical power systems.
(d) Public telephone communication :
Dial-up and committed leased cellphone lines are mostly used for Distribution Automation. The dial-up strains are suitable for infrequent knowledge trans-mission. The leased line are suitable for steady communication however are pricey. The reliability of verbal exchange varies broadly and is dependent upon the cell enterprise. Phone communique provider by means of packet switching community, cell radio are attainable and can have the benefits of providing services in other-smart inaccessible areas.
(e) Satellite communication :
A satellite communi-cation approach utilizing very small aperture terminal (VSAT) is compatible for DAS. VSAT is a factor to multi-point megastar network like TDMA. It consists of one single Hub and quantity of far flung individual Earth Stations (PES). The communication between transponder and Hub is TDM access and between Hub and PES is TDMA access. The communi-cation approach between Hub far off PES is by means of two separate radio links. The link from faraway PES to Hub is called inroute and from Hub to the far off PES is referred to as as outroute. No finish person transmission both originates or terminates on the satellite tv for pc. In India increased ‘C’ band with up link in the 6.15/ 6.815 and down link within the 4.09/ four.Fifty nine KHz variety is used. Fig. 42.Four shows schematic diagram of VSAT network.
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