Transmission lines are one of the electrical power grid facilities used for electricity transmission from the generators to the consumers.
Transmission lines typically connect between substations. Since the length of transmission lines spans dozens of kilometers
by nature, transmission lines are exposed to natural environment and thus vulnerable to fault due to natural factors such as rain, wind
and lightening. Thus, the faultsoccur on the transmission lines more frequently than on the other types of facilities.
A reliable transmission line protection scheme is necessary because transmission lines not only deliver electricity but also
have great impacts on stability of electrical power systems due to changes in power flows when they get fault.
An IED is applied as a reliable main protection relay with a protection function that is designed to protect the target transmission
line section, and a separate IED is applied for backup protection having another protection function to widely protect the series of
transmission lines.
Division | Item | Specification | ||
---|---|---|---|---|
SLP-K120 | SLP-K140 | SLP-K310 | ||
Ratings | Input power | DC 90~140[V],60Hz | DC 90~140[V],60Hz | DC 90~140[V],60Hz |
Rated voltage(PT) | 110/√3[V] | 110/√3[V] | 115/√3[V] | |
Rated current(CT) | 5[A] | 5[A] | 5[A] | |
Digital output | 10[A] : 250VAC 24 points |
10[A] : 250VAC 32 points |
10[A] : 250VAC 48 points |
|
Digital input | DC 70 ~ 150[V] 40 points |
DC 70 ~ 150[V] 36 points |
DC 70 ~ 150[V] 24 points |
|
Communication | Communication port | USB B-Type, Ethernet, Fiber Optic | RS-232, Ethernet, Fiber Optic | RS-232, Ethernet, Fiber Optic |
Protocol | IEC61850, TCP/IP, IEEE C37.94 | IEC61850, TCP/IP, IEEE C37.94 | TCP/IP, IEEE C37.94 | |
Time sync. | IRIG-B, SNTP | IRIG-B, SNTP | IRIG-B, SNTP |