Siemens 7SA511 manual Direction NON-DIR, Block, DIREC. Comparison Solidly Earthed

7SA511 Line Protection Relay Programming the Relay

Table 5-23.Settings for Directional, Definite Time Overcurrent Protection With Nondirectional

Backup Element

Addr.

3101

3103

3104

3106

LCD Text

E/F D.T.

Ie>

Ue>

T-DIRECT.

Description

Turn the ground fault definite time protection on or off

Pickup value for ground current detection

Minimum displacement voltage required for directional determination

Trip delay for directional element

Preset

ON

0.20I/In

5.0V

0.90 s

Options/Range

OFF

0.10- 1.00 I/In

1.0- 10.0 V

0.00- 32.00 s

3107

3108

DIRECTION

T-NON-DIR.

Direction used for directional determination

Trip delay time for nondirectional backup element

FORWARDS

1.20 s

REVERSE NON-

DIRECTIONAL

￿0.00•- 32.00 s

3109

T-BLOCK

Time duration during which ground fault protection is blocked when distance protection has picked up

1.30 s

0.00 - 320.00 s

5.15.2Directional Comparison Protection With Nondirectional Backup (3200) For directional, definite time overcurrent protection with directional comparison and nondirectional backup, the parameters are set in address block 3100, as discussed above, and in address block 3200. The parameters for the echo keying function are also in address block 3200.

Table 5-24 lists the relay presettings and setting options available. 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 Settings:
Addr.	LCD Text	Description
7808	EARTH FAULT	Type of earth (ground) fault
		protection
1102	SYSTEMSTAR	System neutral condition
3100	(See Table 5-23 above.)
block

Setting

DIREC. COMPARISON SOLIDLY EARTHED

5-40 July 27, 1995