Transmission system PCM30U-OCH is designed especially for energy networks and it evolved from a purely telecommunications multiplexer. This multiplexer was purposefully changed and gradually developed to be entirely adapted to the specific technical requirements of energetics. Transmission system PCM30U-OCH has long been able to meet the high demands of energy industry and provides a wide range of telecommunications and teleprotection services.
The energy transfer leads to undesirable situations, such as network failures due to external factors, network congestion, or excess of energy, which can lead to physical damage and financial losses. Therefore all EHV lines are protected – on each end the protection monitors current, phase and other parameters, and on the basis of their values it considers the occurrence of failure.
Given the complexity and interconnection of energy networks, in order to protect these it is essential to have information about other nodes in the network than just a record from a place where the line protection is located. Therefore it needs to communicate – transmit information. To disconnect a command must be sent – a highly secure binary information – that following the decision on failure will disconnect the faulty section through disconnecters (within 100 ms in the EU and reduction in time needed can be expected), and thus protect the rest of the network infrastructure from failure spread.
If the generator disconnects from the grid, whether because of failure, maintenance, or energy excess in the network, one must re-connect it very carefully. This sensitive process requires knowledge of the frequency and phase of the grid. In order to synchronize the phases of the grid and the generator, specific information about the network must be available. It is fully the responsibility of the network operator to ensure phasing through the communication between the energy supplier and the grid not only with the operators, but also at the level of commands to connect or disconnect the generator and lines.
To minimize costs, many grid substations are converted to unmanned operation. The network operator obtains all relevant information from sensors in the substation, and also confirmation of condition visually (e.g. that the switchgear is really switched) by transmitting images – video.
Geographically large network requires adequate allocation of staff, as well as traditional telecommunications services, services of IP telephony, data transmission, Ethernet etc. These services you can lease at a high rate from telecommunications providers or you can use your own transmission paths and then offer the excess capacity to others, the transmission system PCM30U-OCH can meet all your requirements with ease and provide transmission in a single pair of optical fibers, or via radio link.
