- Two- and Three-Winding Current Differential Protection
Sensitive current differential protection with programmable single- or dual-slope percentage restraint, supervised by a choice of second- and fourth-harmonic blocking or restraint elements, plus fifth-harmonic and dc blocking elements for secure protection of up to three windings. Phase current harmonic blocking is set for either common or independent winding basis. Unrestrained high-set differential elements provide fast operation for high-magnitude internal faults. "Around the clock" phase angle compensation settings and automatic tap calculations simplify settings.
- Individual Winding Overcurrent Protection
Torque-controllable overcurrent elements, including one instantaneous, one definite-time, and one inverse-time element, each for phase, negative-sequence, and residual ground currents, provide comprehensive overcurrent protection on each winding input. Combined overcurrent feature sums current from two inputs for ring bus and breaker-and-a-half overcurrent applications.
- Through-Fault Recording and Monitoring
Through-fault duty is recorded and accumulated for use in SELogic® control equations or manual monitoring.
- Overexcitation (V/Hz) Protection
Volts-per-hertz elements detect overexcitation conditions in the protected apparatus. Choose from multiple curves (including user-defined) and definite-time elements for alarm and tripping applications.
- Over- / Underfrequency Protection
There are six available frequency elements. The user sets the desired number of frequency elements.
- Restricted Earth Fault
Restricted Earth Fault (REF) logic for sensitive protection of grounded wye windings.
Built-In Web Server
Access basic relay information on a standard Ethernet network with a built-in web server. View relay status, Sequential Events Recorder (SER), metering information, and settings through easy access within a local network. Web server access requires relay password and is limited to read-only viewing of information.
- Control Logic
SELogic control equations with SELogic variables, timers, latch bits, and remote control elements for customizing advanced protection and control schemes. Local programmable control elements and programmable text display points for advanced local operator interface.
- Metering and Reporting
Oscillographic event reports (up to seven 60-cycle reports), Sequential Events Recorder (SER) reporting, and accurate three-phase power metering eliminate or reduce external recorder and metering requirements. Station battery monitor and circuit breaker contact wear monitor provide important data for Reliability Centered Maintenance (RCM) programs.
EIA-232 and EIA-485 serial ports for local/remote access and system integration.
Download event reports using the optional Ethernet port. Quickly move information with IEC 61850 protocol, which includes a Select-Before-Operate function for added operational security. Increase communications dependability with dual failover Ethernet.
acSELerator QuickSet® SEL-5030 Software
Develop relay settings offline, program SELogic control equations, and analyze post-fault event reports.