Figure 12-4 Networking Application Of The Tp Card - Raisecom RC3000-15 Hardware Description

Raisecom
RC3000-15 (P100R001) Hardware Description
12.2.8 Networking applications
Networking application
Generally, the teleprotection devices, together with telecontrol devices, relay devices, and
circuit breakers, are installed in the telecommunication room of the high-voltage power
system and used for power grid protection. To communicate with each other, teleprotection
devices should transmit services to the telecommunication room where the multiplexing
device is located (the transmission distance ranges from 2 km to 4 km generally), and then
services are transmitted by the multiplexing device through the transmission network for
long-distance transmission.
The C37.94 standard defines parameters and functions between the teleprotection device and
multiplexing device, such as N× 64 kbit/s (N = 1–12), frame format, interfaces, metrics, and
alarms, to ensure that teleprotection devices and multiplexing devices from different vendors
and compliant with this standard can be interconnected. This standard avoids the problem that
teleprotection devices from different vendors cannot cooperate with each other and enhances
the fault location and detection performance through standard alarm definitions.
Figure 12-4 shows the TP card networking. Insert one TP card and one STM1 card into the
two RC3000-15 devices respectively.
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Figure 12-4 Networking application of the TP card

Fault location
Services of the teleprotection devices are important, so you need to monitor service
transmission faults. Based on the alarm function defined by the C37.94 standard,
teleprotection device and multiplexing device cooperate with each other to monitor
transmission faults and locate faults according to the alarm status.
Figure 12-5, Figure 12-6, and Figure 12-7 show common faulty points, service status, and
alarm status. And corresponding descriptions are listed in Table 12-14, Table 12-15, and Table
12-16.
Services accessed by the TP card are cross-connected to the STM1 aggregation card
through the backplane, and then are transmitted uplink to the transmission network
through the STM1 card after being multiplexed.
The TP card of the RC3000-15 at one end accesses services of the teleprotection device
based on the C37.94 standard. These services are transmitted to the RC3000-15 at the
other end after being crossed and multiplexed. And then the RC3000-15 at the other end
demultiplexes the services and sends the C37.94 services to the teleprotection device
through the TP card.
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