GE L60 Instruction Manual page 26

2.1 INTRODUCTION
2
Diagnostic features include a sequence of records capable of storing 1024 time-tagged events. The internal clock used for
time-tagging can be synchronized with an IRIG-B signal or via the SNTP protocol over the Ethernet port. This precise time
stamping allows the sequence of events to be determined throughout the system. Events can also be programmed (via
FlexLogic™ equations) to trigger oscillography data capture which may be set to record the measured parameters before
and after the event for viewing on a personal computer (PC). These tools significantly reduce troubleshooting time and sim-
plify report generation in the event of a system fault.
A faceplate RS232 port may be used to connect to a PC for the programming of settings and the monitoring of actual val-
ues. A variety of communications modules are available. Two rear RS485 ports allow independent access by operating and
engineering staff. All serial ports use the Modbus
with baud rates up to 115.2 kbps. The RS232 port has a fixed baud rate of 19.2 kbps. Optional communications modules
include a 10BaseF Ethernet interface which can be used to provide fast, reliable communications in noisy environments.
Another option provides two 10BaseF fiber optic ports for redundancy. The Ethernet port supports IEC 61850, Modbus
TCP, and TFTP protocols, and allows access to the relay via any standard web browser (L60 web pages). The IEC 60870-
5-104 protocol is supported on the Ethernet port. DNP 3.0 and IEC 60870-5-104 cannot be enabled at the same time.
The L60 IEDs use flash memory technology which allows field upgrading as new features are added. The following Single
Line Diagram illustrates the relay functionality using ANSI (American National Standards Institute) device numbers.
2-2
~ 5c
Tx1P
~ 6c
Rx1P
~
5b
BATT+
L60 - 1
PLC
~ 6b
BATT-
~
5a
Tx1N
~ 6a
Rx1N
FOR DUAL COMPARISON
TYPICAL 2-TERMINAL APPLICATION
~ 5c
Tx1P
PLC
~
6c
Rx1P
~
5b
BATT+
L60 - 1
~ 6b
BATT-
~
Tx1N 5a
PLC
~ 6a
Rx1N
TYPICAL 3-TERMINAL APPLICATION
Figure 2–1: 87PC COMMUNICATIONS
®
RTU protocol. The RS485 ports may be connected to system computers
L60 Line Phase Comparison Relay
~
6c
~ 5c
~ 5b
PLC
~
6b
~ 6a
~
5a
SECOND CHANNEL
~
6c
PLC
~ 5c
~ 5b
~
6b
~ 6a
PLC
~
5a
CH1
2 PRODUCT DESCRIPTION
Rx1P
Tx1P
BATT+
L60 - 2
BATT-
Rx1N
Tx1N
Rx1P
Tx1P
BATT+
L60 - 2
BATT-
Rx1N
Tx1N
831788A1.CDR
GE Multilin
®
/