Earth Fault Protection; Directional Elements; Non-Directional Elements; Sef Protection (Residually Connected) - GE MiCOM P40 Agile Technical Manual

P14x
Instantaneous phase overcurrent elements
(
V I R
= +
K sp CT
2.2

EARTH FAULT PROTECTION

2.2.1

DIRECTIONAL ELEMENTS

Instantaneous earth fault overcurrent elements
I
fn
(
V R
= +
K CT
2
2.2.2

NON-DIRECTIONAL ELEMENTS

Time-delayed earth fault overcurrent elements
I
cn
V ( R
= +
K CT
2
Instantaneous earth fault overcurrent elements
(
V I R
= +
K sn CT
2.3

SEF PROTECTION (RESIDUALLY CONNECTED)

2.3.1 DIRECTIONAL ELEMENTS
Time delayed SEF protection
I
≥ +
cn
V ( R
K CT
2
Instantaneous SEF protection
I
≥ +
fn
(
V R
K CT
2
2.3.2 NON-DIRECTIONAL ELEMENTS
Time delayed SEF protection
I
≥ +
cn
(
V R
K CT
2
Instantaneous SEF protection
I
≥ +
sn
(
V R
K CT
2
P14xEd1-TM-EN-1
)
R R
+
L p
2 )
R R Rn
+ +
L p
2 R R R )
+ +
L p n
2 )
R R R
+ +
L p n
+ +
2 R R Rn )
L p
+ +
2 )
R R Rn
L p
+ +
2 )
R R Rn
L p
+ +
2 )
R R Rn
L p
Chapter 9 - Current Transformer Requirements
201