Product Overview

The PCS-921 series is a microprocessor-based digital circuit breaker protection and automatic reclosing device. Functions include breaker failure protection, three-phase inconsistency protection, dead-zone protection, charging overcurrent protection, and automatic reclosing. Among them, the PCS-921C is mainly used for double-circuit lines on the same tower and, when coordinated with PCS-902E or PCS-931E, forms an adaptive reclosing scheme to avoid reclosing onto permanent faults, thereby improving system stability.

Product Functions

Protection Functions

Breaker failure protection

Three-phase inconsistency protection

Dead-zone protection

Charging overcurrent protection

Automatic reclosing function

PT disconnection alarm

TWJ abnormality alarm

Synchronous voltage disconnection alarm

Auxiliary Functions

Online hardware and loop detection

DC power loss alarm

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

256 event reports, 64 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