Siemens 7SA511 manual Zone & Description, Overcurrent Fault Detection Settings

7SA511 Line Protection Relay Chapter 5

Table 5-12 lists the protection presettings and setting options for overreach zones Z1B and Z1L. 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.

Table 5-12. Distance Protection Settings for Controlled (Overreach) Zones Z1B and Z1L

Addr.

1401

1402

1403

1404

1405*

LCD Text

R1B

X1B

R1BE

DIREC. Z1B

T1B 1phase

Zone & Description

Z1B. Resistance for phase-to- phase faults.

Z1B. Reactance value (reach).

Z1B. Resistance for phase-to- ground faults.

Z1B. Measurement direction.

Z1B. Trip delay for single-phase faults.

Preset

1.50

3.00

3.00

FORWARDS (line direction)

0.00 s

Options/Range

0.05 - 65.00 W

0.05- 130.00

0.05- 130.00 W

REVERSE (bus) NON-

DIRECTIONAL

0.00 - 32.00 s

1406*

T1B>1phase

Z1B. Trip delay for multi-phase faults.

0.00 s

0.00•- 32.00 s

1411

1412

1413

1414

1415

R1L

X1L

R1LE

DIREC. Z1L

T1L

Z1L. Resistance for phase-to- phase faults.

Z1L. Reactance value (reach).

Z1L. Resistance for phase-to- ground faults.

Z1L. Measurement direction.

Z1L. Trip delay.

2.00

4.00

4.00

FORWARDS (line)

0.00 s

0.05 - 65.00 W

0.05- 130.00

0.05- 130.00 W

REVERSE (bus) NON-

DIRECTIONAL

￿0.00•- 32.00 s

5.10.4 Overcurrent Fault Detection Settings

Threshold values for overcurrent detection are set in address 1601 for phase currents and in address 1602 for ground currents. Table 5-13 describes the relay overcurrent fault detection presettings and setting options. Compare these presettings to the information on the completed worksheets and determine which settings, if any, 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

7801 DIST. PROT.

7802 DIST. F. DET.

Description

Distance protection function

Type of fault detection

Setting

EXIST OVERCURRENT

*Normally, addresses 1405 and 1406 are set to the same value.

July 27, 1995 5-29