Siemens 7SA511 manual MAN. Close, Stage

7SA511 Line Protection Relay Chapter 5

have changed all of the necessary settings, follow the procedure described in section 5.3.4 to save the new settings.

Prerequisite Setting:

Addr.	LCD Text
7803	EMERG. O/C

Description

Emergency overcurrent protection function

Setting

EXIST

Table 5-21.Emergency Overcurrent Protection Settings

Addr.

2601

2603

2604

LCD Text

EMERG. O/C

I> phases

T-I> phase

Description

Turn emergency overcurrent protection on or off

Definite time pickup value for phase currents

Definite time trip delay for phase currents

Preset

ON

1.00I/In

1.50s

Options/Range

OFF

0.10- 4.00 I/In

0.00- 32.00 s

2605	I>> phases	High-set pickup value for phase
		currents
2606	T-I>> phas	High-set trip delay for phase
		currents
2608	I> earth	Definite time pickup value for
		ground currents
2609	T-I> earth	Definite time trip delay for
		ground currents
2610	MAN. CLOSE	Select which overcurrent element
		(high-set or definite time) is
		effective during manual close of
		the circuit breaker

2.00I/In

0.30s

0.20I/In

0.30s

I>> STAGE

0.50- 9.99 I/In

0.00- 32.00 s

0.10 - 4.00 I/In

￿0.00•- 32.00 s

I> STAGE

5.14 Ground Fault Protection for Ungrounded Systems (3000) (optional)

This section applies only for relay models 7SA511*-**A5*-1*** and only when the relay is used in ungrounded networks (isolated or compensated neutral). Skip this section if the relay is used in a grounded network.

Table 5-22 lists the relay presettings and setting options available for configuring ground fault protection for ungrounded systems. Compare these presettings to the information on the completed worksheets and determine which settings you need to change to match your operating environment. When you have changed all of the necessary settings, follow the procedure described in section 5.3.4 to save the new settings.

July 27, 1995 5-37