Product Overview

The PCS-931 series is a digital ultra (extra) high-voltage transmission line complete fiber-optic current differential protection device. It features fast primary protection based mainly on split-phase current differential and zero-sequence current differential elements, unique power-frequency variation distance protection, and a full set of backup protection consisting of three-stage phase-to-phase and ground distance protection plus multi-stage zero-sequence directional overcurrent protection. It also includes automatic reclosing functionality and can serve as primary and backup protection for 220kV and above transmission lines. The device fully supports digital substation functions, IEC 61850-9-2 sampling value transmission protocol, IEC 61850 communication protocol, and real-time GOOSE functionality.

Product Functions

Protection Functions

Split-phase power-frequency variation differential protection

Split-phase current differential protection

Zero-sequence current differential protection

Transient capacitive current compensation

Power-frequency variation distance protection

Three-stage phase-to-phase distance protection

Three-stage ground distance protection

Two-stage or inverse-time zero-sequence directional overcurrent protection

Overcurrent protection and overcurrent protection upon PT disconnection

Overvoltage and remote trip protection

Distance and zero-sequence acceleration protection

Oscillation blocking

Automatic reclosing

Supports multiple pilot communication modes including dedicated fiber, multiplexed fiber, and 5G

Supports two-phase electrified railway power supply lines

Supports three-terminal / four-terminal differential application scenarios

Auxiliary Functions

Online hardware and loop detection

Impedance-based fault location

Traveling-wave fault location (optional)

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