PLCC schematic
The equipment can be configured for “speech-plus” operation (simultaneous transmission of speech and audio tones). When used for data one, each channel can carry up to twenty four 50 baud telegraphic/data channels or a smaller number of channels at higher baud rates. Elements of the system may also be used for transmission over cable, open-wire lines, and radio multiplex applications.
This is a single-side-band (SSB) carrier system that uses the available frequency spectrum more efficiently than all other modulation techniques. Each terminal is available as either a single or twin channel unit. Each channel provides a voice-grade circuit over the transmission medium, and occupies a separate KHz band in either direction of transmission.
LINE TRAPS
High voltage transmission line are used for the transmission of carrier signals between 30KHz to 50KHz for Speech, Data, and Protection signals. Line traps are used to prevent the loss of these high frequency signals to the sub-station side. The Line Traps are connected in series to the Transmission line and are designed to carry the rated power frequency current, as well as to withstand the substation fault currents.
The 650W Coupling Device comprising of coupling filters and protective devices is used to couple the PLCC terminals onto the high voltage transmission line. The device is purely passive and is inserted between the low voltage terminals of the coupling capacitor and the co-axial connection to the carrier terminal. The coupling filter, together with the coupling capacitor forms T section band pass filter with multi band selections.
IGITAL PROTECTION SIGNALING EQUIPMENT
Tele-protection equipment transmits the trip signal from the protection equipment in power station and substations. Tele-protection links using power line carrier channels are the most economical way of performing all the tasks associated with transmitting tripping signals. Security, dependability and transmission time are the important characteristics of any Tele-protection equipment. Interface on the communication channels should neither be interpreted as a trip command (security) nor in admissibly delay the transmission of genuine trip commands (Dependability and Txn time).
In digital Coupler Digital Signal Processing techniques are used for transmission, reception and validation of signals. This Single Chip solution helps to reduce the total number of cards and also ensures secure and dependable operation with short transmission times.
PROTECTION SIGNALING EQUIPMENT
Tele-protection equipment transmits the trip signal from the protection equipment in power station and substations. Tele-protection links using power line carrier channels are the most economical way of performing all the tasks associated with transmitting tripping signals. Security, dependability and transmission time are the important characteristics of any Tele-protection equipment. Interface on the communication channels should neither be interpreted as a trip command (security) nor in admissibly delay the transmission of genuine trip commands (Dependability and Txn time).
DIGITAL POWER LINE CARRIER COMMUNICATION SYSTEM
The new Digital PLCC equipment provides multiplexed voice-grade channels for the transmission of speech or audio tones over high-voltage transmission lines and insulated static lines. The transmitted audio tones can be used for telemetering, supervisory control, protective relaying, data or other purposes. DSP based technologies makes the filters and other signal processing sections to work at maximum efficiency.
Power Line Carrier Communication Technology (PLCC) is an economical method widely used for communication of speech and signals meeting the essential criteria of reliability and availability. The technique permits transmission over long distances and has the advantage of using an existing medium that extend to all points in the grid.
Digital power line carrier communication equipment offering comprehensive transmission capabilities based on innovative technology. The new PLCC has been developed to cater for the environment and constraints of the power utilities environment. It provides a high quality of service and is cost-effective. Multiple speed and operating modes, tools and services etc.
This high voltage transmission solution is perfectly adapted to the environments of power utilities and their constraints. It offers several speed and operating modes, which can be easily adapted to the user’s needs. The DPLCC, based on innovative technology, includes a comprehensive system tools and services. Cost-effective, quality solution offering a high quality of service and extreme modularity, this cost-effective solution provides uncompromising tele-protection equipment. It is also have user friendly menu driven system utility using TFT display with touch screen and IP/LAN connectivity for remote programmability.
The proven design techniques result in low power consumption, improved reliability and high performance.
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