1.4
SEL-700G Relay
Instruction Manual
Date Code 20170814
Introduction and Specifications
Features
Generator Protection
Element Selection
The SEL-700G provides protection elements suitable for applications
protecting many different generators. Use Table 1.3 to select the protection
elements to enable for specific applications.
Monitoring Features
➤
Event Summaries that contain relay ID, date and time, trip cause,
and current/voltage magnitudes
➤
Event Reports including filtered and raw analog data
➤
Sequential Events Record (SER)
➤
Compatibility with SEL-3010 Event Messenger
➤
A complete suite of accurate metering functions
➤
Generator operating statistics monitoring
➤
Breaker wear monitoring
➤
Load profile recorder
➤
Generator automatic synchronization report
Communications and
Control
➤
EIA-232, front-panel port
➤
EIA-232, EIA-485, single or dual, copper or fiber-optic
Ethernet, and fiber-optic rear panel EIA-232 ports
➤
IRIG-B time-code input
Table 1.3
Recommended Protection Elements by Generator Grounding Method
Element/Function
High-Impedance
Grounded
Resistance
Grounded
Solidly
Grounded
21 Backup Element Compensator Distance(DC)
Available
a
Available
Available
24 Volts/Hertz Element
Recommended
Recommended
Recommended
27 Undervoltage
Optional
Optional
Optional
32 Reverse/Low-Forward Power
Recommended
Recommended
Recommended
40 Loss-of-Field
Recommended
Recommended
Recommended
46 Negative-Sequence Overcurrent
Recommended
Recommended
Recommended
50N/51N Neutral Overcurrent
Suggested
b
Suggested
Recommended
50P Phase Overcurrent
Not Recommended
Not Recommended
Recommended
51C/51V Voltage-Controlled and Voltage-Restrained
Time-Overcurrent
Available
Available
Available
59 Overvoltage
Optional
Optional
Optional
64G 100% Stator Ground Elements
Recommended
Suggested
c
Not Recommended
78 Out-of-Step
Recommended
Recommended
Recommended
81 Over- and Underfrequency Elements
Recommended
Recommended
Recommended
81 AC Abnormal Frequency Scheme
Available
Available
Available
87 Current Differential Elements
Suggested for large machines
Optional
Optional
87N Ground Differential Element
Not Recommended
Suggested
Suggested
a
Select no more than one of 21DC, 51C, or 51V elements for backup protection.
b
If neutral CT is available.
c
If neutral PT is available.
Summary of Contents for SEL-700G Series
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