CPR04 Capacitor Protection Relay

The CPR 04 provides comprehensive protection for the capacitive, inductive and resistive elements of three phase medium and high voltage shunt capacitor banks and harmonic filter circuits. The capacitor banks may have a single star, double star, delta or „H“ configuration, with internally fused, externally fused or unfused capacitor units.

The Trench CPR 04 is a comprehensive, numeric protection relay, featuring:

• Compact draw-out design

• Panel or 19 inch rack mounting

• Four software configurable measuring elements

• Five configurable output relays

• One self-supervision output relay

• User configurable, to cater for a wide range of relay settings

• Operating mode software selectable (NORMAL / H-BRIDGE)

• RS232 serial data port at the front

• Software selectable RS232 or RS485 serial data port at the rear

• Time stamping function for trip history and setting menu

CPR04 protective functions

1. Normal Mode operation

• Peak Repetitive Overvoltage Protection

• Thermal Overcurrent Protection

• Star Point Unbalance Protection

• Line Current Unbalance Protection

• Ground Fault Protection

• Fundamental Frequency Overvoltage and Overcurrent Protection

• RMS Overcurrent protection

• Undercurrent Protection Breaker Fail Protectio

• Capacitor Bank Discharge Timer

• Braker fail protection

• Event trip

2. H-Bridge Mode operation

• “H”-Configuration Capacitor Bank Unbalance Protection

• Event trip