- High-Impedance Differential Protection
High-impedance differential protection offers immunity against relay misoperation resulting from CT saturation. The SEL-587Z Relay uses internal 2000-ohm resistors to provide security against the effects of CT saturation for through faults. Internally mounted metal oxide varistors (MOV) are connected in parallel with the high-impedance element to clamp secondary peak voltage to less than 2 kV.
- Overcurrent Protection
Separate phase, neutral, and negative-sequence overcurrent elements, including instantaneous, definite-time, and inverse time-overcurrent elements for backup overcurrent protection.
- Protection and Control Logic
SELOGIC® control equations with SELOGIC variables and timers facilitate traditional or advanced protection schemes.
- Monitoring and Reporting
Oscillographic event reports (up to ten 15-cycle reports) and metering functions eliminate or reduce external recorder and metering requirements. Sequential Events Recorder (SER) stores the latest 512 entries in nonvolatile memory.
- Serial Data Communications
Use the front and rear serial ports for communicating with ASCII terminals, local HMI, SCADA, or DCS systems. As an ordering option, select an EIA-232 or EIA-485 rear serial port. Through settings, select and configure the ports for SEL ASCII and interleaved SEL Fast Binary messages, or Modbus® RTU Slave protocol.
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- Panel-mount or rack-mount hardware package.
- EIA-232 front and EIA-232 or EIA-485 rear-mounted serial communications ports. Either rear-mounted port includes a demodulated IRIG-B time-code input.Low energy or high energy clamping MOVs. Use high energy clamping MOVs for 5 A CT applications.
- Accessory lockout relay.
- Conformal Coating—Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.
 Learn more about conformal coating.
- Protect substation buses.
- Apply sensitive restricted earth fault protection on transformers with grounded-wye windings.Use built-in overcurrent elements for transformer bushing fault protection.
- Use SEL-5010 Relay Assistant Software to manage your relay settings.
Budgetary Retail, Quantity 1: $3,940
Fully Optioned Price: $4,255
(Prices displayed are for planning purposes and are subject to change. Contact your SEL sales representative today for a quote on configurations and quantities to meet your needs.)
Cutaway view showing
stabilizing resistors and MOVs.
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