Product Overview

As the third line of defense for the power system, the NARI Relays PCS-993 Series Out-of-Step Separation Device is mainly used for out-of-step detection on system tie-lines or power plant outgoing lines. When out-of-step operation of the power system is detected, measures such as separating tie-lines, separating power plant outgoing lines, or generator tripping are taken to prevent system collapse and avoid large-scale blackouts. The device fully supports digital substation functions, the IEC 61850-9-2 sampling value transmission protocol, the IEC 61850 protocol, and real-time GOOSE functionality.

Product Functions

Control Functions

Out-of-step relay based on impedance sequential discrimination principle

Impedance zone relay

Out-of-step relay based on Ucosφ trajectory discrimination principle

Zone relay based on minimum voltage principle

Auxiliary Functions

Online hardware and loop monitoring

Minute pulse, second pulse, and IRIG-B time synchronization

128 event reports, 32 fault recording reports

Diverse communication solutions supporting power industry standards IEC 60870-5-103 and IEC 61850

User-friendly HMI with convenient supporting debugging software and powerful waveform analysis tools