CYG PRS-7367 - Trip logic 94 T

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Protection Functions

PRS-7367 179

3.35 Trip logic 94T

3.35.1 Overview

This relay provides trip logic for tripping BO.

3.35.1.1 Function Block

The function block of the protection is as below.

Block

94T

Reset

CB_Cls

CB_Opn

TripIn

I3P

OpA

OpB

LockOut

BlkAR

TripOut

OpC

SelA

SelB

SelC

1POpEF

OpBlkAR

Figure 3.35-1 The 94T function block

3.35.2 Protection Principle

The operation of 94T can be described by using a module diagram. All the modules in the diagram

are explained in the next sections.

All relay tripping BO after onDelay time delay

All relay tripping BO will return when Block is 1.

 Lockout Type: The relay tripping BO can be connected to external Lockout relay.

 Pulse type: The relay tripping BO pulse is fixed to time delay with setting 94Ti_PulseTime, the