SEL SEL-300G Generator Relay

SEL-300G Generator Relay

Protect, Monitor, and Control

Your Generator

Apply the SEL-300G for

comprehensive protection

and control of small,

medium, and large generators.

Features and Benefits

■    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 acSELE r at o r ® 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.

■    Provide    Secure    Remote    Control    and    Monitoring

Use Modbus®, ASCII communications, and SEL Fast SER capabilities

for control, monitoring, and alarm purposes. Control relay operation

and initiate or block automation sequences from remote or local

control systems using serial port commands

Complete Generator Fault Protection

Limit equipment damage and speed repairs with high-speed protection

for all types of phase and ground faults. Current and voltage elements,

combined with optional differential protection, make the SEL-300G

suitable for all generator sizes and configurations.

• Current and voltage elements protect large and small machines

against damaging faults.

• Optional differential protection provides sensitive and fast

protection for generators and unit transformers. Harmonic

blocking provides security when transformers are in the generator

differential zone.

• 100-percent stator ground fault protection uses fundamental and

third-harmonic voltage signals.

• Continuously measure field-to-ground resistance using the

SEL-2664 Field Ground Module. Accurately detect field ground

faults whether the generator is operating, stopped, or de-energized.

Speed repair and troubleshooting to reduce costs and get units back

online. Identify root cause for emergency and triggered shutdown

of generators and prime movers using detailed event reports. Program

recordings of voltage and current waveforms with internal relay and

external monitor points for an accurate record of operations and events.

• Improve operation analysis with a timed record of the last 512

operations of 96 different internal and external events.

• Use the built-in SER to verify startup and shutdown sequencing,

routine and emergency operations, and timing of alarms.

• Dual-element loss-of-field protection prevents rotor heating and

system instability from abnormally low excitation

Simplified Setup and Troubleshooting

Use acSELErator QuickSet to customize your generator protection.

Set and edit relay configuration, settings, and logic.

• View the HMI screens in acSELErator QuickSet to check wiring

polarity and connections.

•    Receive instant alarm messages triggered by selectable relay

events using SEL Fast SER messaging.

• Use the acSELErator QuickSet Software Event Viewer or the more

advanced acSELErator Analytic Assistant SEL-5601 Software to

clearly view and understand system faults. To aid in analysis,

records can be up to 180 cycles long