SGCC Nanjing Automation PSC641U Capacitor Protection and Control Device

1 Overview

The PSC 641U Capacitor Protection and Control Device is a multifunctional device with basic configurations including current and voltage protection and unbalance protection. It integrates various measurement

and control functions, suitable for shunt capacitors at voltage levels of 35kV and below. Its application fields cover industries such as power, water conservancy, transportation,

petroleum, chemical, coal, metallurgy, etc.

1.1 Protection Function Configuration

a) Two-stage phase current protection

b) Two-stage zero-sequence current protection

c) Overcurrent inverse-time protection

d) Zero-sequence inverse-time protection

e) Undervoltage protection

f) Overvoltage protection

g) Three independent unbalance protections

h) Automatic switching function

i) Non-electrical protection

j) TV disconnection detection

1.2 Measurement and Control Function Configuration

a) Measured quantities such as current, voltage, power, power factor, etc.

b) 14 external switch input telemetry collection

c) Circuit breaker position, manual tripping, and accident telemetry

d) Normal circuit breaker opening and closing

e) 2 pulse inputs, electric energy accumulation

f) GPS time synchronization input (adaptive to minutes and seconds)

Main Models and Functions

a) PSL 641U Line Protection and Control Device, suitable for protection and control of transmission or distribution lines;

b) PSL 642U Line Protection and Control Device, includes phase-to-phase distance protection, suitable for important lines;

c) PSL 646U Line Protection and Control Device, includes optical fiber current differential protection, suitable for important short lines.

1.1.2 Transformer Protection and Control Device

a) PST 641U Transformer Differential Protection Device, suitable for transformers with capacities of 6.3MVA and above or important transformers in industrial enterprises;

b) PST 642U Transformer Protection and Control Device, suitable for backup protection of transformers with capacities of 6.3MVA and above or important transformers in industrial enterprises.

c) PST 644U Non-Electrical Protection Device is for non-electrical protection and can be used in conjunction with PST 641U and PST 642U.

d) PST 645U Transformer Protection and Control Device, suitable for station service/grounding transformers.

1.1.3 Capacitor Protection and Control Device

PSC 641U Capacitor Protection and Control Device, suitable for protection and control of shunt capacitor banks in substations, configured with differential voltage (or differential current), unbalance voltage (or current) inputs.

1.1.4 Reactor Protection and Control Device

PST 648U Reactor Protection and Control Device, suitable for protection and control of series and shunt reactors at voltage levels of 35kV and below.

1.1.7 Automatic Transfer Switch Device

a) PSP 641U Automatic Transfer Switch Device, suitable for simple automatic transfer of backup power sources with various wiring methods at different voltage levels.

b) PSP 642U Automatic Transfer Switch Device, suitable for complex automatic transfer of backup power sources with various wiring methods at different voltage levels.