Directional Comparison Pickup; Unblocking With Z1B - Siemens SIPROTEC 7SA6 Manual

Distance protection relay for all voltage levels

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Table of Contents

FCT Weak Infeed

ECHO and TRIP

Dist. OFF/BLOCK

O/C VTsec lost

O/C OFF/BLOCK

from rec. logic (Figure

6-58 or 6-60)

>Dis.T.BlkEcho

CB open (3pole)

Logic diagram of the echo function with distance protection teleprotection

Applying the Function Parameter Settings

Echo release by earth fault

(refer also to Figure 6-86)

The distance protection teleprotection supplement is only in service if it is set during

the configuration to one of the possible modes of operation in address 121 . Depend-

ing on this configuration setting, only those parameters that are relevant to the select-

ed mode of operation will appear here. If the teleprotection supplement is not required,

address 121 is Teleprot. Dist. = Disabled .

The following teleprotection schemes are available:

− PUTT (Pickup)

− Directional

− Unblocking

2502 Time DELAY

= Permissive underreach transfer trip with pickup, as re-

ferred to in Subsubsection 6.6.1.1,

= Permissive underreach transfer trip with zone accelera-

tion Z1B, as referred to in Subsubsection 6.6.1.2,

= Permissive overreach transfer trip, as referred to in Sub-

subsection 6.6.1.4,

= Directional comparison pickup,

as referred to in Subsubsection 6.6.1.5,

= Unblocking with Z1B, as referred to in Sub-section

= Blocking scheme, as referred to in Sub-section 6.6.1.7,

2503 Trip EXTENSION

C53000-G1176-C156-2