Dual polarizing
When dual polarizing is selected the function will use the vectorial sum of the voltage
based and current based polarizing in accordance with the following formula:
(
)
0
0
0
3
3
s
VTotPol VVPol VIPol
V
Z
IPol
V
RNPol
jXNPol
IPol
=
+
= -
+
×
= -
+
+
×
ANSIEQUATION1878 V1 EN
(Equation 20)
Vpol and Ipol can be either zero sequence component or negative sequence component
depending upon the user selection.
Then the phasor of the total polarizing voltage VTotPol will be used, together with the
phasor of the operating current, to determine the direction of the ground fault (Forward/
Reverse).
8.2.7.3
External polarizing for ground-fault function
The individual steps within the protection can be set as non-directional. When this setting
is selected it is then possible via function binary input BLKx to provide external
directional control (that is, torque control) by for example using one of the following
functions if available in the IED:
1. Distance protection directional function.
2. Negative sequence polarized General current and voltage multi purpose protection
function.
8.2.7.4
Directional detection for ground fault function
Zero sequence components will be used for detecting directionality for ground fault
function. In some cases zero sequence quantities might detect directionality wrong.
Negative sequence quantities will be used in such scenario. The user can select either zero
sequence components or negative sequence components for detecting directionality with
the parameter
SeqTypeIPol
. I3PDIR input always connected to the same source as I3P
input.
8.2.7.5
Base quantities within the protection
The base quantities are entered as global settings for all functions in the IED. Base current
(
IBase
) shall be entered as rated phase current of the protected object in primary amperes.
Base voltage (
VBase
) shall be entered as rated phase-to-phase voltage of the protected
object in primary kV.
Section 8
1MRK 511 365-UUS A
Current protection
202
Phasor measurement unit RES670 2.1 ANSI
Technical manual
Содержание Relion 670 Series RES670
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