Siemens 7SA511 manual Distance Protection Settings, Fuse Fail

7SA511 Line Protection Relay Programming the Relay

sufficient. 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 5-8. Measured Value Supervision Settings

Addr.

2901

2902

2903

2904

2905

2906

2910

2911

2912

LCD Text

SYM.Uthres

SYM.Fact.U

SYM.Ithres

SYM.Fact.I

SUM.Ithres

SUM.Fact.I

FUSE FAIL

FFM 3*Uo>

FFM Ie<

Description

Voltage threshold (phase-to-phase) above which the symmetry monitoring is effective

Symmetry factor for the voltage sym- metry = slope of the symmetry charac- teristic

Current threshold above which the symmetry monitoring is effective

Symmetry factor for the current sym- metry = slope of the symmetry charac- teristic

Current threshold above which the summation monitoring reaction is effective

Relative content, related to the maxi- mum conductor current, for operation of current summation monitoring

Condition of fuse failure monitor. This must be set to OFF for grounded systems where ground faults with small or zero ground currents can occur.

Displacement voltage 3V0, above which fuse failure should be detected

Ground current, above which no fuse failure is assumed

Preset

50V

0.75

0.50I/In

0.10I/In

ON

30V

0.50 I/In

Options/Range

10 - 100 V

0.58 - 0.95

0.10- 1.00 I/In

0.10- 0.95

0.10- 2.00 I/In

0.00- 0.95

OFF

10 - 100 V

0.10 - 1.00 I/In

5.10 Distance Protection Settings

Distance protection is the main function of the 7SA511 relay. The distance protection function must be set as “EXIST” under address 7801 (see section 5.6). If “NON-EXIST” was selected, you can skip the rest of this section.

This section identifies the addresses used to configure the relay distance protection functions. Refer to Reference E, “Setting Calculations,” for information on determining the protection settings needed for your operating environment. Table 5-9 identifies, by address block, the distance protection settings in the 7SA511 relay.

5-24 July 27, 1995