Description - GE t60 Instruction Manual

3.3 DIRECT I/O COMMUNICATIONS
3.3DIRECT I/O COMMUNICATIONS
The T60 direct inputs/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 I/O feature uses the communications
channel(s) 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 eight (8) UR-series relays can be connected in a single ring
3
The following diagram shows the interconnection for dual-channel Type 7 communications modules. 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 as follows: 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 UR2-Rx2, UR2-Tx2 to UR3-Rx2, UR3-Tx2 to UR4-Rx2, and UR4-Tx2 to UR1-
Rx2 for the second ring.
3-20
UR #1
UR #2
UR #3
UR #4
Figure 3–21: DIRECT I/O SINGLE CHANNEL CONNECTION
UR #1
UR #2
UR #3
UR #4
Figure 3–22: DIRECT I/O DUAL CHANNEL CONNECTION
T60 Transformer Management Relay
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
3 HARDWARE

3.3.1 DESCRIPTION

GE Multilin