Description
This reference design is intended for use in molded case circuit breakers (MCCB) electronic trip units. The op amp based design acts as current monitoring for over-current earth fault relays. Utilizing a low cost op amp: this design provides a pick-up (A) accuracy ±10 % and time delay (s) accuracy 0 to -20%. Additionally: this design takes harsh environment conditions in mind with features such as ambient insensitivity from -10 to 70 °C and high electromagnetic immunity. Finally the analog front end of this design seemlessly interfaces to TI MSP430 MCU for quicker evaluation and faster time-to-market.
End equipment reference diagrams
Features
Pick-up accuracy at ±10 % and time delay accuracy at 0 to -20% offer wide range of adjustment for maximum flexibilityAmbient insensitivity from -10 to +70 °C for global design and worldwide acceptanceExcellent trip time repeatabilityWide input DC-DC converter with under voltage and overcurrent protectionSelf-power (CT powered) supply with reduced CT loading and Power lossRobust design that prevents phase reversal in overdrive conditions and high electrostatic discharge (ESD) protection (4-kV HBM)
Applications
- Fault indicator (FI)
- Battery energy storage system
- Residential breakers
- Remote power distribution automation
- Grid asset monitoring
- Binary input module
- Compact relay
- Contractor circuit
- Substation automation
- Circuit breaker (ACB
- MCCB
- VCB)
- Smart electrical panel
Product categories
- Amplifiers
