F-PRO
L-PRO
M-PRO
S-PRO
TESLA
T-PRO
ERMLG
B-PRO
S-Pro 4000
Sub-Harmonic Protection Relay
The S-PRO sub-harmonic protection relay protects various power system equipment including generators, wind turbines, PV system, series compensated transmission lines, FACTS devices and power transformers from uncontrollable sub-synchronous oscillation conditions known as:
sub-synchronous torsional interaction (SSTI)
sub-synchronous control interaction (SSCI)
sub-harmonic resonance (SSR)
sub-harmonic ferroresonance
These sub-synchronous oscillation conditions introduce opportunities for an exchange of energy at a given sub-synchronous frequency of the system. This exchange of energy results in stress on the power system elements involved that can lead to severe damage.
The S-PRO relay detects these undamped sub-synchronous oscillations and allows the utility to monitor and protect the power system by isolating the healthy grid from sub-harmonic generation sources.
Key Features & Capabilities
Real-time monitoring and detection of Sub-Synchronous Oscillation (SSO)
Sub-Synchronous Resonance (SSR) detection for series-compensated transmission lines
First microprocessor-based relay with 10-second high-speed recording capability
Protection for FACTS devices, HVDC links, and series-compensated networks
Especially designed for wind farm applications where sub-harmonics are most prevalent
Control, automation, metering, and monitoring in an integrated package
Dynamic swing recording and fault oscillography
Easy-to-use intuitive settings and analysis software
IDEAL FOR Wind energy developers, transmission operators using series capacitor compensation, and grid engineers managing HVDC or FACTS systems where sub-synchronous interactions pose a risk to generation equipment.