Method Of Operation; Directional Comparison Scheme - Siemens SIPROTEC 7SA6 Manual

Distance protection relay for all voltage levels

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Table of Contents

Method of Operation

Switching On and

The teleprotection function can be switched on and off by means of the parameter

3201 FCT Telep. E/F , or via the system interface (if available) and via binary inputs

(if these are allocated). The switched state is saved internally (refer to Figure 6-77)

and secured against loss of auxiliary supply. It is only possible to switch on from the

source where previously it had been switched off from. To be active, it is necessary

that the function is switched on from all three switching sources.

FCT Telep. E/F

EF TeleprotOFF

EF Teleprot.ON

System port: EF Telep. OFF

System port: EF Telep. ON

Switching on and off of the signal transmission logic

The following procedure is suited for both conventional and digital transmission media.

The directional comparison scheme is a permissive scheme. In Figure 6-78 the

ation scheme

When the earth fault protection recognizes a fault in the forward direction, it initially

sends a permissive signal to the opposite line end. If a permissive signal is also re-

ceived from the remote end, the trip signal is passed on to the tripping relay. Accord-

ingly it is a prerequisite for fast tripping that the fault is recognized in the forward direc-

tion at both line ends.

The send signal can be prolonged by T

send signal only comes into effect if the protection has already issued a trip command.

This ensures that the permissive signal releases the opposite line end even if the earth

fault is very rapidly cleared by a different independent protection.

EF Telep. OFF

(parameter setting). The prolongation of the

C53000-G1176-C156-2