ABB Relion 670 Series Applications Manual page 496

Section 17
Monitoring
by knowing the zero sequence currents of other winding(s). The zero sequence current calculation
is done numerically by setting
transformers or zero sequence traps. However, it is necessary to consider zero sequence currents
from every individual winding by proper setting of
On the other hand, winding current transformers measure the winding currents directly so that
there is no need to calculate winding currents. In these cases, the
Disabled and ConnTypeWx should be set as WYE .
The following settings are related to the winding current calculation which is set under advanced
settings.
Common base IED values for primary current (
winding are set in global base values for settings function GBASVAL. The settings
GlobalBaseSelW1 , GlobalBaseSelW2 and GlobalBaseSelW3 in the through fault monitoring function
are used to select the corresponding GBASVAL function as a reference.
GlobalBaseSelW1 : It defines the GBASVAL function instance for the reference of base values for
winding 1. Similarly,
GBASVAL function instance for winding 2 and winding 3 respectively.
NoOfWindings : It defines the number of windings in a transformer. It has two options to select
between;
third winding related outputs are set to zero. General data in the through fault monitoring report
will show zero for all outputs which is related to winding 3 for two-winding configuration.
ConnTypeW1 : It defines the connection type of winding 1. It has two options to select between;
WYE and Delta . Similarly, connection types shall be set for winding 2 and winding 3 in settings
which designated with W2 and W3 in the settings name. In this case, if more than one winding
connection type is
ClockNumberW2 : It defines the phase displacement between winding 1 and winding 2. It has the
options to select the clock number between 0 to 11. Similarly, the phase displacement between
winding 1 and winding 3 shall be set using setting
17.12.3.3 On-line correction with on-load tap changer position
The PTRSTHR (51TF) function in the IED has a built-in logic to correct the calculated winding
current according to the present tap position of an on-load tap changer. The following settings
are related this correction feature which is set under advanced settings:
OLTCWinding : It defines where the OLTC's (OLTC1, OLTC2) are physically located. It has 10 options
to select between;
1, Winding 3 / Winding 2, Winding 1 / Winding 2, Winding 3 / Winding 3, Winding 1 / Winding 3,
Winding 2 .
• If the value
not exist and it disregards all other settings related to OLTC's.
• If either one of the
assumes that only one OLTC has existed and it discards settings related to second OLTC.
• If any values other than the above-mentioned options are selected, then the function assumes
that the OLTC1 is located in first mentioned winding and OLTC 2 is located in secondly
mentioned winding. For example, if the value
function assumes OLTC1 is located in winding 1 and OLTC2 is located in winding 3.
490
ZSCurrCor = Disabled or Enabled and does not require any auxiliary
GlobalBaseSelW2 and GlobalBaseSelW3 settings shall be used to define the
Two windings and Three windings . When the value Two windings is selected, then the
Delta , then setting ZSCurrCor shall be set as Disabled .
Not Used / Winding 1 / Winding 2 / Winding 3 / Winding 1, Winding 2 / Winding
Not Used is selected, then the function assumes that both OLTC1 and OLTC2 do
Winding 1 / Winding 2 / Winding 3 values is selected, then the function
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ZSCurrCor to Disabled or Enabled .
ZSCurrCor should be set as
IBase ) and primary voltage ( UBase ) for a particular
ClockNumberW3 .
Winding 1, Winding 3 is selected, then the
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