Siemens 7SA511 manual General Settings

7SA511 Line Protection Relay Programming the Relay

5.10.1 General Settings (1200)

The 7SA511 relay consists of five distance zones and seven time delays:

Independent distance zones:		Z1		Delay T1
		Z2		Delay T2
		Z3		Delay T3
Controlled (overreaching) zones:		Z1B		Delay T1B
		Z1L		Delay T1L
Final elements:	Fault detection, directional		Delay T4
		Fault detection, nondirectional		Delay T5

The direction of the directional zone and the delay times T4 and T5 are set in address block 1200. You also establish the valid distance measuring range when the circuit breaker is manually closed. Table 5-10 lists the presettings and setting options. 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 5-10.Distance Protection General Settings

Addr.

1201

1202

1203

LCD Text

DIST. PROT.

DIR. FLT&T4.

T4

Description

Turn distance protection on or off

Select direction for directional trip with fault detection

Trip delay T4—fault detection, directional trip

Preset

ON

FORWARDS (line)

0.90 s

Options/Range

OFF

REVERSE (bus) NON-

DIRECTIONAL

0.00 - 32.00 s

1204	T5	Trip delay T5—fault detection,
		nondirectional trip

1.20 s

0.00•- 32.00 s

1205

1206

MAN. CLOSE

MEAS. REPET

Distance measuring range used when circuit breaker is manually closed—Z1B is the directional overreach zone; ZA is the nondirectional fault detection zone; and Z1 is the normal first zone

Set measurement repetition cycle—choose YES if difficult measurement conditions are present; choose NO for automatic measurement repetition in the region of the balance point

Z1B EFFECTIVE

NO

￿ZA EFFECTIVE

Z1 EFFECTIVE

YES

5-26 July 27, 1995