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Overcurrent and Distance Relays - SIPROTEC

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7SJ511 Numerical overcurrent–time protection relay (Version V3)<br />

Technical data (continued)<br />

Definite–time overcurrent protection <strong>Overcurrent</strong> phase �><br />

earth �E><br />

High set current phase �<br />

earth �E<br />

Delay times<br />

Tolerances<br />

Current pick–up value<br />

Time<br />

Reset time<br />

Inverse–time overcurrent protection <strong>Overcurrent</strong> phase �p<br />

earth �Ep<br />

High set current phase �� (DMT)<br />

earth �E� (DMT)<br />

Time multiplier tp<br />

Pick–up value<br />

Characteristics according to IEC255–4, paragraph 3.5.2 or BS142<br />

(if 11th place of order number = 0)<br />

US curves<br />

(if 11th place of order number = 1)<br />

Linear current range<br />

Tolerances<br />

Pick–up value<br />

Time<br />

Shortest operating time201<br />

<strong>Overcurrent</strong> <strong>and</strong> <strong>Distance</strong> <strong>Relays</strong><br />

�/�N = 0.1 to 25<br />

�/�N = 0.1 to 25<br />

�/�N = 0.1 to 25<br />

�/�N = 0.1 to 25<br />

0 to 60 s or infinity<br />

�5 % of set value<br />

�1 % or �10 ms<br />

approx. 30 ms<br />

�p/�N = 0.1 to 4<br />

�p/�N = 0.1 to 4<br />

�/�N = 0.1 to 25<br />

�/�N = 0.1 to 25<br />

0,05 to 3,2 s<br />

1.1 x �p<br />

normal inverse, very inverse, extremely<br />

inverse<br />

�p: 0.1 to 4, D: 0 to 10s<br />

Siemens LSA 2.1.3 . March 1997 9<br />

25 x �N<br />

�5 %<br />

�5 % for 2 �(�/�p>) �20 <strong>and</strong> tp = 1<br />

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