Project Description

SEL-300G Generator Relay

SEL-300G Generator Relay
In order to make technology available for the first time that complies with IEEE turbine protection standards, SEL has applied its expertise in the production of microprocessor-based relays to create the SEL-300G, a generator relay that includes several unique features designed for unsurpassed protection, monitoring, and control of electrical generators.

SEL designed the SEL-300G to meet the needs of a variety of users, including utility and industrial power plants and generator set manufacturers.

Functional Overview

 SEL-300G Functional Overview
21P/C
51V/C
Phase Mho or Compensator Distance Voltage Restrained/Controlled Time-Overcurrent
24 Volts/Hertz
25 Synchronism Check
27 Undervoltage
32 Directional Power
40 Loss-of-Field
46 Neg. Seq. Overcurrent
49 Thermal
50N Neutral Overcurrent
50 (P,G,Q) Overcurrent (Phase, Ground, Neg. Seq.)
51N Neutral Time-Overcurrent
51G Ground Time-Overcurrent
59N Neutral Overvoltage
59 (P,G,Q) Overvoltage (Phase, Ground, Neg. Seq.)
60 Loss-of-Potential
64F Field Ground
64G 100 Percent Stator Ground
78 Out-of-Step
81 (O,U) Frequency (Over, Under)
87 Three-Phase Current Differential
87N Neutral Current Differential
BRM Breaker Wear Monitor
DFR Event Reports
LGC SELogic Control Equations
MET High-Accuracy Metering
SBM Station Battery Monitor
SER Sequential Events Recorder

* Optional

 

Front- and Rear-Panel Diagrams

SEL-300G Front Panel SEL-300G Rear Panel
Front Rear

 

Limit Equipment Damage

Apply complete phase and neutral protection together with 100-percent stator ground fault detection. Specify optional unit differential and thermal monitoring for important machines. Use out-of-step, loss-of-excitation, overexcitation, frequency, and directional power elements for detection of abnormal operating conditions. Accurately detect generator field grounds. Make settings and check connections with acSELErator® QuickSet™ SEL-5030 Software. Specify the optional synchronism check function for supervision of paralleling operations.

Increase Generator Availability

Simplify fault and system disturbance analysis with oscillographic event reports and a Sequential Events Recorder (SER). Monitor real-time and accumulated off-nominal frequency, run-time hours, full-load hours, and other important quantities. Minimize separate metering devices by using voltage, current, power, power factor, and energy metering capabilities. Monitor up to 12 machine temperatures using the SEL-2600 Series RTD Modules.

Increase Generator Availability

Simplify fault and system disturbance analysis with oscillographic event reports and a Sequential Events Recorder (SER). Monitor real-time and accumulated off-nominal frequency, run-time hours, full-load hours, and other important quantities. Minimize separate metering devices by using voltage, current, power, power factor, and energy metering capabilities. Monitor up to 12 machine temperatures using the SEL-2600 Series RTD Modules.

 

Comparison

300G 700G 547
Generator Protection
Induction Motor Protection
Breaker Failure Protection f f
Equipment Thermal Monitoring + +
Generator Intertie Protection
Synchronism Check + +
Integrated Synchronizer +
21P Phase Mho or Compensator Distance +
24 Overexcitation (Volts/Hertz)
27/59 Under-/Overvoltage
32/37 Directional/Underpower Elements
40 Loss-of-Field
46 Current Unbalance
47 Phase Reversal
49 Thermal
50 (P,N,G) Overcurrent (Phase, Neutral, Ground)
50Q Negative-Sequence Overcurrent
51 (N,G) Time-Overcurrent (Neutral, Ground)
55 Power Factor f f
60 Loss-of-Potential
64G 100 Percent Stator Ground +
64F Field Ground
67 (N,G) Directional Overcurrent (Neutral, Ground)
78 Out-of-Step
81 Over-/Underfrequency
87 Current Differential + +
87G Restricted Earth Fault
Separate Neutral Overcurrent
Inadvertent Energization f f
Flashover Protection f f
SELogic Control Equations/Remote Control Switches
Nonvolatile Latch Control Switches
Multiple Settings Groups
Station Battery Monitor
Breaker Wear Monitor
Event Report (Multicycle Data)/Sequential Events Recorder
Demand Meter
Load Profile Report
RTD (Resistance Temperature Detector) Inputs + +
Ethernet +
IEC 61850 +
DNP3 LAN/WAN +
Simple Network Time Protocol (SNTP)
Modbus TCP
Modbus RTU Outstation +
Synchrophasors With IEEE C37.118 Protocol
Mirrored Bits Communications
DeviceNet +
Accepts Wye or Open-Delta Voltage Transformers +
Connectorized (Quick Disconnect) Available +
Standard Feature
+ Model Option
f This function may be created using settings

Product Literature