7.12
High speed distance protection ZMFPDIS
GUID-CC4F7338-2281-411D-B55A-67BF03F31681 v3
7.12.1
Identification
GUID-8ACD3565-C607-4399-89D2-A05657840E6D v3
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
High speed distance protection zone
ZMFPDIS
S00346 V1 EN-US
21
7.12.2
Application
IP14961-1 v2
GUID-2F952D87-6BEB-4425-B823-DF8511B9E742 v3
The fast distance protection function ZMFPDIS in the IED is designed to provide sub-cycle,
down to half-cycle operating time for basic faults. At the same time, it is specifically designed
for extra care during difficult conditions in high-voltage transmission networks, like faults on
long heavily loaded lines and faults generating heavily distorted signals. These faults are
handled with utmost security and dependability, although sometimes with a reduced
operating speed.
7.12.2.1
System earthing
GUID-EB5B5594-AA81-4FC5-BBC0-7627A8609A23 v1
The type of system earthing plays an important role when designing the protection system.
Some hints with respect to distance protection are highlighted below.
Solidly earthed networks
GUID-6B0F02F4-18ED-415E-8D48-0A1648F7CE00 v2
In solidly earthed systems, the transformer neutrals are connected directly to earth without
any impedance between the transformer neutral and earth.
IEC05000215 V2 EN-US
Figure 185: Solidly earthed network
The earth-fault current is as high or even higher than the short-circuit current. The series
impedances determine the magnitude of the fault current. The shunt admittance has very
limited influence on the earth-fault current. The shunt admittance may, however, have some
marginal influence on the earth-fault current in networks with long transmission lines.
The earth-fault current at single phase-to-earth in phase L1 can be calculated as equation
L1
L1
0
1
2
0
f
1
N
f
3 U
U
3I
Z
Z
Z
3Z
Z
Z
Z
×
=
=
+
+
+
+
+
EQUATION1267 V3 EN-US
(Equation 309)
Section 7
1MRK 505 343-UEN B
Impedance protection
302
Application manual
Содержание Relion 670 series
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