Siemens 7SA511 manual Fault Location Settings, Prerequisite Setting Addr LCD Text Description

7SA511 Line Protection Relay Programming the Relay

Addr.

3432

3433

3434

3435

3436

LCD Text

DAR PROG.

DAR SHOTS

DAR BLOCK

DAR T-ACT.

DAR T-3POL

Description

Select DAR program - only after an unsuccessful RAR cycle; without prior RAR; no DAR

Number of permissible DAR cycles (does not include the RAR)

Specify Z1 trip delay when DAR is blocked

Action time for DAR

Dead time for DAR

Preset

DAR AFTER RAR

0

Z1: T1

0.20s

0.80s

Options/Range

DAR WITHOUT

￿RAR WITHOUT DAR

0 - 9

Z1: T1B

0.01- 320.00 s

0.01- 320.00 s

5.17 Fault Location Settings (3800)

Address block 3800 consists of the settings required for determining the location of a fault. The settings include selecting how fault location is initiated, the length of the line, and the reactance per-unit-length. For relays equipped with parallel line compensation (model number 7SA511*- **A5*-2***), you also indicate at address 3805 that parallel line compensation is effective. See Reference E, “Setting Calculations,” for detailed information on determining the fault location settings and for the prerequisites required for the parallel line compensation application.

Table 5-28 lists the relay presettings and the setting options available for fault location. 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	Description
7805	FAULT LOCAT.	Fault location function

Table 5-28.Fault Location Settings

Setting

EXIST

Addr.

3802

3803*

3804*

3805

LCD Text

START

X SEC

LINE LENGTH

PARAL.LINE

Description

Select how fault location is initiated

Reactance value of the line, per unit line length, as a secondary value related to 1 A.

Total length of the line

Indicate whether or not parallel line compensation is effective

Preset

TRIP COMMAND

0.500 W/km

100.00km

NO

Options/Range

DROP-OFF or TRIP

0.010 - 5.000 W/km

1.00- 550.00 km

YES

*Although the LCD will always display the unit of length as kilometers, the per-unit-length values may be specified as miles as long as both parameters(3803 and 3804) are specified consistently. Reference E, “Setting Calculations” provides details on calculating secondary values from primary values.

5-44 July 27, 1995