Siemens manual Line Protection Relay 7SA511, Ground fault detection input

7SA511 Line Protection Relay			Chapter 1
Line Protection Relay	7SA511	A5

Rated current at 60/50 Hz AC

1 A	1
5 A	5
Rated power supply voltage VDC
24, 48 VDC	2
60, 110, 125 VDC	4
220, 250 VDC	5

Mounting construction

Surface mounting	B
Flush mounting	C
Fault detection options

Overcurrent fault detection

Overcurrent, Voltage-controlled Overcurrent, and Polygonal Impedance fault detection

Overcurrent and Voltage-controlled Overcurrent fault detection

Ground fault detection input

For grounded systems, ground current input for protected line only For ungrounded systems, without parallel line compensation

For grounded systems, ground current input for parallel line compensation

Communications interface (rear port)

None

Isolated, hard-wired

Integrated fiber optic

Automatic reclose (AR)/Parameter changeover (PCO)

without AR	without PCO
with AR 3-pole	without PCO
with AR 1/3-pole	without PCO
without AR	with PCO
with AR 3-pole	with PCO
with AR 1/3-pole	with PCO

Power swing (PS)/High-resistance ground fault protection (GF) *

without PS	without GF
with PS	without GF
without PS	with GF
with PS	with GF

1

2

3

0

1

2

A

B

C

A

B

C

E

F

G

0

1

2

3

*The Power swing (PS) option is only applicable when the fault detection system selected is the polygonal impedance detector (code = 2). The High-resistance ground fault (GF) protection is only applicable for grounded systems, i.e., the ground fault detection Input code must be 0 or 2.

Figure 1-1. Reading the 7SA511 Relay Model Number.

July 27, 1995 1-7