GE Multilin
G60 Generator Protection System
2-1
2 PRODUCT DESCRIPTION
2.1 INTRODUCTION
2
2 PRODUCT DESCRIPTION 2.1INTRODUCTION
2.1.1 OVERVIEW
The G60 Generator Protection System is a microprocessor based relay that provides protection, monitoring, control, and
recording functions for AC generators driven by steam, gas, or hydraulic turbine. Current, voltage and frequency protection
are provided along with fault diagnostics. Breaker fail function is provided for up to four breakers.
Voltage, current, and power metering is built into the relay as a standard feature. Current parameters are available as total
waveform RMS magnitude, or as fundamental frequency only RMS magnitude and angle (phasor).
Diagnostic features include an event recorder capable of storing 1024 time-tagged events, oscillography capable of storing
up to 64 records with programmable trigger, content and sampling rate, and data logger acquisition of up to 16 channels,
with programmable content and sampling rate. The internal clock used for time-tagging can be synchronized with an IRIG-
B signal, using the Simple Network Time Protocol (SNTP) over the Ethernet port, or using the Precision Time Protocol
(PTP). 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 trouble-
shooting time and simplify report generation in the event of a system fault.
Several options are available for communication. A faceplate RS232 port can be used to connect to a computer for the pro-
gramming of settings and the monitoring of actual values. The RS232 port has a fixed baud rate of 19.2 kbps. The rear
RS485 port allows independent access by operating and engineering staff. It can be connected to system computers with
baud rates up to 115.2 kbps. All serial ports use the Modbus RTU protocol. The 100Base-FX or 100Base-T Ethernet inter-
face provides fast, reliable communications in noisy environments. The Ethernet port supports IEC 61850, IEC 61850-90-5,
Modbus/TCP, and TFTP protocols, PTP (according to IEEE Std. 1588-2008 or IEC 61588), and allows access to the relay
via any standard web browser (G60 web pages). The IEC 60870-5-104 protocol is supported on the Ethernet port, and
DNP 3.0 and IEC 60870-5-104 cannot be enabled at the same time. The Ethernet port also supports the Parallel Redun-
dancy Protocol (PRP) of IEC 62439-3 (clause 4, 2012) when purchased as an option.
Settings and actual values can be accessed from the front panel or EnerVista software.
The G60 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.
Table 2–1: ANSI DEVICE NUMBERS AND FUNCTIONS
DEVICE
NUMBER
FUNCTION
DEVICE
NUMBER
FUNCTION
21P
Phase distance backup
51N
Neutral time overcurrent
24
Volts per hertz
59N
Neutral overvoltage
25
Synchrocheck
59P
Phase overvoltage
27P
Phase undervoltage
59X
Auxiliary overvoltage
27TN
Third harmonic neutral undervoltage
59_2
Negative-sequence overvoltage
27X
Auxiliary undervoltage
64F
Field ground protection
32
Sensitive directional power
64S
Sub-harmonic stator ground protection
40
Loss of excitation
64TN
100% stator ground
46
Generator unbalance
67_2
Negative-sequence directional overcurrent
49
Thermal overload protection (RTD)
67N
Neutral directional overcurrent
50BF
Breaker failure
67P
Phase directional overcurrent
50G
Ground instantaneous overcurrent
68
Power swing blocking
50N
Neutral instantaneous overcurrent
78
Out-of-step protection
50P
Phase instantaneous overcurrent
81O
Overfrequency
50SP
Split phase protection
81R
Rate of change of frequency
50/27
Accidental energization
81U
Underfrequency
51G
Ground time overcurrent
87RGF
Restricted ground fault
51PV
Phase time overcurrent with voltage
restraint
87S
Stator differential
Summary of Contents for Multilin g60
Page 10: ...x G60 Generator Protection System GE Multilin TABLE OF CONTENTS INDEX ...
Page 32: ...1 22 G60 Generator Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 160: ...4 30 G60 Generator Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 486: ...5 326 G60 Generator Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 518: ...6 32 G60 Generator Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 532: ...7 14 G60 Generator Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Page 748: ...D 10 G60 Generator Protection System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 760: ...E 12 G60 Generator Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...