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Transformer Protection Relay Function Overview

 

DF3330

DF3333

DF3333A

DF3331A

DF3331B

Differential

 

 

 

 

 

Intantaneous unrestrained differential protection

 

 

Percentage restraint differential protection

 

 

Harmonic blocking logic, independent/common

 

 

Differential current abnormality detection

 

 

Acquisition abnormality detection

 

 

High-side Overcurrent & Voltage

 

 

 

 

 

Ovecurrent protection combination voltage blocking

 

 

 

Optional blocking: combination voltage or directional

 

 

 

Residual overcurrent protection

 

 

 

Optional blocking: residual voltage or directional

 

 

 

Busbar charging protection

 

 

 

 

Residual overvoltage protection with residual current blocking

 

 

 

Residual overvoltage alarm

 

 

 

 

Therminal overload alarm

 

 

 

Mid-side Overcurrent & Voltage

 

 

 

 

 

Ovecurrent protection combination voltage blocking

 

 

 

 

Busbar charging protection

 

 

 

 

 

Residual overcurrent protection

 

 

 

 

 

Residual overcurrent alarm

 

 

 

 

Busbar charging protection

 

 

 

 

 

Therminal overload alarm

 

 

 

 

 

Low-side Overcurrent & Voltage

 

 

 

 

 

Ovecurrent protection combination voltage blocking

 

Optional blocking: combination voltage or directional

 

Residual overcurrent protection

 

 

 

Busbar charging protection with combination voltage blocking

 

 

 

Residual overvoltage alarm

 

 

 

Therminal overload protection

 

 

 

 

Therminal overload alarm

 

 

 

 

Assistant Function

 

 

 

 

 

Differential tripping failure protection

 

 

 

CT saturation detection

 

 

CT break alarm

PT break detection

 

 

Combination voltage output contact

 

 

 

Monitoring

 

 

 

 

 

Disturbance recorder

Event recorder

Fault recorder

Alarm recorder

Operation recorder

Mesurement

 

 

 

 

 

Analogue input

 

 

 

 

 

Digital input

 

 

 

 

 

Puls counter

 

 

 

 

 

Digital output

 

 

 

 

 

Platform

 

 

 

 

 

Self-supervision

Real-time clock with external syncronization

Four groups of setting

Local Human Machine Interface

Pint interface