PSC 691U Capacitor Protection Measurement and Control Device

Guodian Nanzi PSC 691U Capacitor Protection and Control Device

1 Functions
Instantaneous Overcurrent Protection
Overcurrent Protection
Overvoltage Protection
Undervoltage Protection
Zero-sequence Overcurrent Protection
Unbalanced Current Protection
Unbalanced Voltage Protection
Phase Voltage Differential Protection
Bridge Differential Current Protection
Three-phase Measurement
Two-phase Measurement
GPS Time Synchronization

Technical Features
 Equipped with a high-speed processor running at 200 MHz, rich built-in resources, and a simplified peripheral circuit design, ensuring manufacturing quality and stability. Ample hardware resources include 4MB Flash Memory and 8MB SDRAM.
 Features a USB interface for direct firmware upgrades via USB drive and storage of operation information and fault recording data, facilitating fault analysis.
 Measures three-phase currents and zero-sequence current (Ia, Ib, Ic, Io), three-phase or line voltages (Uan, Ubn, Ucn, Uab, Ubc, Uca), active power P, reactive power Q, power factor cosφ, frequency f, active energy kWh, and reactive energy kVarh.
 Measurement values for current, voltage, power, and energy accurately reflect both fundamental and 2nd to 13th harmonics, ensuring consistency with precision measuring instruments.
 Includes one 4–20mA DC analog output (configurable as current, voltage, or power), replacing AC acquisition transmitters.
 Supports up to 14 user-configurable digital input interfaces with customizable names.
 Protection element trip outputs can be configured via a trip matrix, allowing users to select which relays to activate. All relay output contacts can be set as trip contacts (auto-reset) or signal contacts (manual reset).
 Built-in operating circuit adapts to breaker trip/close currents from 0.5A to 5A.
 GPS time synchronization supports hard contact minute/second pulse or IRIG-B time code (via RS485 interface).
 Differential protection includes criteria to prevent maloperation due to TA saturation during equipment startup or external faults.
 Reliable PT broken line detection criteria effectively prevent misoperation of motor undervoltage elements.
 Two 100M Ethernet communication interfaces and one RS485 interface, supporting protocols such as IEC60870-5-103 and Modbus.
 Records 9 fault waveforms, each containing 1.9 seconds of sampled points and amplitude data. Sampled points include up to 14 analog channels (1ms interval), and amplitude data includes up to 40 analog values and 32 digital signals (5ms interval). Two motor startup recordings (100ms interval) cover 1 second before and 29 seconds after startup. Waveforms are stored in standard Comtrade format.
 Utilizes full graphical programming and a stable, reliable protection relay library to enhance program reliability and accuracy.
 Low static power consumption (approx. 6W). The LCD module employs new technology for significantly extended lifespan.
 High immunity to interference, passing 10 EMC tests with high-level (Grade IV) performance in transient, electrostatic discharge, and surge immunity.
 Operating temperature range: -25°C to +55°C (no LCD blurring or lag).