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Capacitor Protection and Control System

Simplify relay setting and application while reducing inventory by using one relay for all of your capacitor bank needs. The versatile SEL-487V Capacitor Bank Protection and Control System can handle grounded and ungrounded, single- and double-wye capacitor bank applications. It provides sensitive voltage differential and current unbalance protection with compensation adjustment for small voltage differential levels due to variations in individual capacitor elements from manufacturing, PT, or instrument transformer measurement errors. Application-based settings simplify setup and installation while fault-finding logic locates faulty capacitor units to speed up necessary maintenance. Synchrophasor technology provides situational awareness and real-time control.

SEL-400 Series Relay Mimic Diagrams

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Starting At

$4,350 USD

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Capacitor Bank Protection—Protect a variety of capacitor configurations, including grounded and ungrounded, single- and double-wye configurations. The SEL-487V has phase- and neutral-current unbalance elements and phase- and neutral-voltage differential elements to provide reliable protection for virtually any application. Apply the IEC 60255-149-compliant thermal model to trigger control actions or issue warnings in adverse operating conditions.

Faulted-Capacitor Location—Save time and money using the relay’s advanced faulted-phase identification logic. The relay provides discrete indications for the phase and location of faulted capacitor units for efficient dispatch of personnel.

Capacitor Bank Monitoring—Record disturbances automatically at key capacitor bank locations using optional voltage sag, swell, and interruption (VSSI) recording. Harmonic metering provides measurements from the fundamental through 15th harmonic as well as information on total harmonic distortion.

Capacitor Control—Obtain full control of capacitor banks without additional devices. The SEL-487V-1 can operate the capacitor bank based on voltage, VAR, power factor, or time-of-day/ day-of-week scheduling. Use local and remote data from IEEE C37.118-compliant synchrophasors to make operation decisions with the real-time control system.




Capacitor Protection Control System

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Capacitor Protection Control System

Achieve Complete Capacitor Bank Protection and Control With One Relay
Protect and control grounded and ungrounded, single- and double-wye capacitor bank applications with a single relay. The SEL-487V includes both voltage differential and overcurrent elements for complete protection.

Provide Flexible Multibank Protection and Control
Provide sensitive capacitor failure detection with application-based settings that provide voltage and current unbalance elements. Select from voltage, power factor, VAR, or time-of-day/day-of-week control schemes. Prevent equipment damage to capacitor banks and switching apparatus using control instability (hunting) detection.

Automatically Sequence Capacitor Banks
The new universal sequencer available in the SEL-487V-1 replaces SELogic control equations or an external programmable logic controller (PLC). It automatically sequences up to three capacitor banks on and/or off, based on which capacitor bank has accumulated the most operations. SELogic-based settings allow a variety of inputs for the sequencing variable, including time, number of operations, kVARs, and fixed (1, 2, 3). It is also possible to reset and preload functions.

Simplify Settings Calculations
Automatically perform calculations for application-based settings using IEEE C37.99 specification settings assistant software.

Improve Power System Reliability and Stability With Built-In Synchrophasor Measurement System
Obtain real-time measurements of electrical quantities. Provide local control based on wide-area measurements.

Save Time Identifying Faults
Find faulty capacitor units using the patented advanced faulted phase and section identification logic.

Apply Flexible Communications

  • An Ethernet card option provides two copper or fiber ports for communication with failover redundancy.
  • Simplify Ethernet network topology and reduce external equipment with dual Ethernet ports that offer a switched mode for looped Ethernet networks.
  • Available Ethernet communications protocols include FTP, Telnet DNP3, LAN/WAN, IEC 61850, IEEE C37.118 synchrophasors, and the Parallel Redundancy Protocol (PRP).


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