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Products

 

Line Protection Relay Function Overview

 

DF3320

DF3320A

DF3322

DF3322A

DF3322B

Line Differential

 

 

 

 

 

Phase differential protection

 

 

 

Negative differential protection

 

 

 

Zero differential protection

 

 

 

Line Distance

 

 

 

 

 

Sudden current change

 

 

 

3 zones phase to phase distance protection

 

 

 

3 zones earth distance protection

 

 

 

Consequential fault acceleration protection

 

 

 

Power-swimming detection

 

 

 

Power-swimming blocking protection

 

 

 

Over Current

 

 

 

 

 

Intantaneous phase overcurrent protection

 

 

Definite-time phase overcurrent protection

 

 

Inverse-time phase overcurrent protection

 

 

 

Negative phase overcurrent protection

 

 

 

 

Zero phase overcurrent protection

Single shot reclosing, 3-phase

 

 

Two shot reclosing, 3-phase

 

 

 

 

Acceleration protection

 

 

 

 

Voltage

 

 

 

 

 

Definite-time under-voltage protection

 

 

 

 

Assistant Function

 

 

 

 

 

Inverse blocking busbar protection

 

 

 

 

Digital input logic protection

 

 

 

Busbar charging protection

 

 

 

Therminal-phase overload protection

Under-frequency protection

 

Manual synchronism

 

Fault location

 

 

CT abnormality alarm

PT break alarm

Residual voltage alarm

 

 

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