Siemens SIPROTEC Manual page 307

Line differential protection with distance protection

Hide thumbs Also See for SIPROTEC:

Table of Contents

Instantaneous tripping before automatic reclosure

If automatic reclosure is to be carried out, quick fault clearance before reclosure is usually desirable. A release

signal from an external automatic reclosure device can be injected via binary input „>O/C InstTRIP". The

interconnection of the internal automatic reclose function is performed via an additional CFC logic, which typi-

cally connects the output signal 2889 „AR 1.CycZoneRel" with the input signal „>O/C InstTRIP". Any

stage of the overcurrent protection can thus perform an instantaneous trip before reclosure via the parameter

Telep / BI ....

Switching onto a fault

To achieve fast tripping of the circuit breaker in case of an earth fault, the internal line energization detection

can be used. The time overcurrent protection can then trip three-pole without delay or with a reduced delay. It

can be determined via parameter setting for which stage(s) the instantaneous tripping following energization

applies (refer also to the logic diagrams Figure 2-153, 2-154 and 2-155). This function is independent of the

high-current instantaneous tripping described in Section 2.14.

Pickup logic and tripping logic

The pickup signals of the single phases (or earth) and of the individual stages are thus linked with each other

that both the phase information and the stage that has picked up is indicated (Table 2-12).

Internal Indication

SIPROTEC, 7SD5, Manual

C53000-G1176-C169-5, Release date 02.2011

Pickup signals of the single phases

2.16 Backup Time Overcurrent Protection

Output Indication

„O/C Pickup L1"

„O/C Pickup L2"

„O/C Pickup L3"

„O/C Pickup E"

„O/C PICKUP I>>"

„O/C PICKUP I>"

„O/C PICKUP Ip"