Table of Contents
Advertisement
3.3 DIRECT INPUT AND OUTPUT COMMUNICATIONS
3.3DIRECT INPUT AND OUTPUT COMMUNICATIONS
The N60 direct inputs and outputs feature makes use of the type 7 series of communications modules. These modules are
also used by the L90 Line Differential Relay for inter-relay communications. The direct input and output feature uses the
communications channels provided by these modules to exchange digital state information between relays. This feature is
available on all UR-series relay models except for the L90 Line Differential relay.
The communications channels are normally connected in a ring configuration as shown below. The transmitter of one mod-
ule is connected to the receiver of the next module. The transmitter of this second module is then connected to the receiver
of the next module in the ring. This is continued to form a communications ring. The figure below illustrates a ring of four
UR-series relays with the following connections: UR1-Tx to UR2-Rx, UR2-Tx to UR3-Rx, UR3-Tx to UR4-Rx, and UR4-Tx
to UR1-Rx. A maximum of sixteen (16) UR-series relays can be connected in a single ring
3
Figure 3–25: DIRECT INPUT AND OUTPUT SINGLE CHANNEL CONNECTION
The interconnection for dual-channel Type 7 communications modules is shown below. Two channel modules allow for a
redundant ring configuration. That is, two rings can be created to provide an additional independent data path. The required
connections are: UR1-Tx1 to UR2-Rx1, UR2-Tx1 to UR3-Rx1, UR3-Tx1 to UR4-Rx1, and UR4-Tx1 to UR1-Rx1 for the first
ring; and UR1-Tx2 to UR4-Rx2, UR4-Tx2 to UR3-Rx2, UR3-Tx2 to UR2-Rx2, and UR2-Tx2 to UR1-Rx2 for the second
ring.
Figure 3–26: DIRECT INPUT AND OUTPUT DUAL CHANNEL CONNECTION
The following diagram shows the connection for three UR-series relays using two independent communication channels.
UR1 and UR3 have single type 7 communication modules; UR2 has a dual-channel module. The two communication chan-
nels can be of different types, depending on the Type 7 modules used. To allow the direct input and output data to cross-
over from channel 1 to channel 2 on UR2, the
forces UR2 to forward messages received on Rx1 out Tx2, and messages received on Rx2 out Tx1.
3-24
UR #1
UR #2
UR #3
UR #4
UR #1
UR #2
UR #3
UR #4
DIRECT I/O CHANNEL CROSSOVER
N60 Network Stability and Synchrophasor Measurement System
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
842006A1.CDR
Tx1
Rx1
Tx2
Rx2
Tx1
Rx1
Tx2
Rx2
Tx1
Rx1
Tx2
Rx2
Tx1
Rx1
Tx2
Rx2
842007A1.CDR
setting should be "Enabled" on UR2. This
3 HARDWARE
3.3.1 DESCRIPTION
GE Multilin
Advertisement
Table of Contents
