Products Relays


S-PRO 4000 Sub-Harmonic Protection Relay

S-PRO 4000 Sub-Harmonic Protection Relay

The S-PRO 4000 is a digital, microprocessor-based sub-harmonic protection system that provides comprehensive sub-harmonic protection for transmission lines at any voltage level, particularly those with serial compensation and interconnected with wind farms. Use the S-PRO Sub-Harmonic Protection Relay for monitoring and protection of uncontrolled sub-harmonics, ensuring a reliable operation of the power grid.

Protect against sustained sub-harmonics in wind farm operations
Undamped sub-harmonic current oscillations created by series capacitors interacting with the wind system can cause serious damage to wind turbine controllers and also to conventional generators. The wind turbine's own mechanical system interactions (tower-to-blade) can also generate sub-harmonics, which are detrimental to induction generators, transformers, and may cause resonance at the point of common coupling in the electrical grid.

The S-PRO 4000 relay detects these sub harmonic oscillations and allows the utility to monitor and protect the power system by isolating the healthy grid from sub-harmonic generation sources.

Features and Benefits

  • Built on a contemporary new substation hardened hardware platform and powered by a state-of-the-art processor
  • Protects the grid from sub harmonic oscillations at the point-of-common-coupling every 1 second, with additional user-configurable delays
  • Provides real time processing of voltage and current signals, comprehensive sub-harmonic protection, with sub-harmonic monitoring for each frequency in the range from 5 Hz to 40 Hz
  • Flexible Communications
    • State-of-the-art communications (2 rear ports, 100BASE-TX RJ-45 or 100BASE-FX 1300 nm multimode optical with ST style connector to accommodate the industry’s latest network-based communications)
    • Ethernet ports with 2 unique MAC addresses that easily accommodate network access security needs
    • Front panel USB and 100BASE-TX RJ-45 Ethernet port interfaces (readily accommodate modern standard laptops)
  • Reduced Cost
    • Product setting time – 240 x 128 LCD graphical user interface provides convenient means to check/change specific settings and parameters
  • Improved Overall Response Time
    • Expedited response to systems events (11 generic front panel LEDs can be mapped to internal elements) allowing operators to quickly identify the cause of system events
  • SPRO screen shotsEasy to Use
    • Flexible programmable logic for building customized schemes with ProLogic™ statements – 24 control logic statements (total of 192 statements)
    • User-friendly, Windows®-based relay setting and record analysis software
    • Enhanced DNP3.0 Level 2 SCADA communication protocol including user-selectable point lists, class support and multiple master station support
    • Exceptional fault recording capabilities with 96 s/cycle, all channels with events (best combination of waveform accuracy and file size)



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Winnipeg, Canada