S-PRO Sub-Harmonic Protection Relay

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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. Features and Benefits Provides real time processing of voltage and current signals at all sub-harmonic frequencies in the range of 5 - 55 Hz (60 Hz system) and 5-45 Hz (50 Hz system) with a detection resolution of 0.2 Hz Operating speed between 200-450ms Provides incident trending to protect generators and other equipment against sustained sub-harmonics beyond normal levels that may not exceed levels that will cause SSR Operations per duration settable for durations from 1-60 minutes Events accumulated over a long period of time can be used to flag maintenance requirements Sub-harmonic measurements monitoring through 61850 GOOSE, DNP 3 and Modbus. Total Sub Harmonic Distortion (TSHD) reporting 59, 27 and 50LS protection at Show more