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

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Method of Operation

Switching On and

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

)&7 7HOHS (), or via the system interface (if available) and via binary inputs

(if these are allocated). The switched state is saved internally (refer to Figure 6-70)

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.

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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 directional comparison scheme is a permissive scheme. In Figure 6-71 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

received from the remote end, the trip signal is passed on to the tripping relay.

Accordingly it is a prerequisite for fast tripping that the fault is recognized in the forward

direction 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.

Operation scheme of the directional comparison method

(parameter setting). The prolongation of the

EF Telep. OFF

C53000-G1176-C133-1

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