Siemens 7SA511 manual Addr LCD Text Description Preset, Permissive Underreach Transfer

7SA511 Line Protection Relay Programming the Relay

Table 5-18.Power Swing Protection Settings
Addr.	LCD Text	Description	Preset
2002	P/S PROGR.	Power swing protection program	BLOCK ALL

Options/Range

BLOCK Z1 ONLY BLOCK ALL BUT

￿Z1

OUT OF STEP TRIP

2003

2004

2005

Delta R

dR/dT

P/S T-ACT.

Distance DR between power swing polygon and fault detection polygon

Rate of change of the power swing vector between the power swing polygon and fault detection polygon, below which the power swing is detected

Power swing action time

5.00

20/s

s

0.10 - 50.00 W

0 - 200 W/s

0.01•- 32.00 s

5.12 Pilot Protection

The setting at address 7804 indicates whether or not the relay is used for pilot protection, and whether a permissive underreach transfer scheme or a permissive overreaching transfer scheme is used. Skip this section if the pilot protection is programmed as non-existing at address 7804 (see section 5.6).

5.12.1 Permissive Underreach Transfer (2100)

Table 5-19 lists the relay presettings and setting options available for the pilot protection permissive underreach transfer scheme. 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.

Prerequisite Setting:

Addr.	LCD Text
7804	TELEPROTEC.

Description

Type of pilot protection

Setting

UNDERREACH

5-34 July 27, 1995