Name
Range
Step
Default
Functions
Description
HV-LV side
mag
correction
0.0…100.0xI
n
0.1xI
n
0.0xI
n
- transformer status
monitoring
- transformer
differential
The magnitude correction for the HV-LV side
currents (in p.u.), if the currents are not
directly matched through the calculations of
the nominal values. The selection is visible
only if the option "Manual set" for the vector
group setting.
Check
online HV-LV
configuration
0: -
1: Check
-
0: -
- transformer status
monitoring
- transformer
differential
The selection of whether or not the function
checks the current going through the
transformer and then compares it to the
settings. For this to work, the transformer
needs to have a current flowing on both sides
and "see" no faults. The selection is visible
only if the option "Manual set" is selected for
the vector group setting.
Table. 5.3.8 - 71. Calculations of the transformer status monitoring function.
Name
Range
Step
Default Functions
Description
HV side
nominal
current (pri)
0.01...50 000.00A
0.01A
0.00A
Info
The calculated primary current of the transformer's
HV side primary current.
HV side
nominal
current (sec)
0.01…250.00A
0.01A
0.00A
Info
The calculated primary current of the transformer's
HV side secondary current.
HV CT nom. to
TR nom. factor 0.01…250.00p.u.
0.01p.u. 0.00p.u. Info
The transformer's HV side calculated nominal to
the CT primary rate.
LV side
nominal
current (pri)
0.01…50 000.00A
0.01A
0.00A
Info
The calculated primary current of the transformer's
LV side primary current.
LV side
nominal
current (sec)
0.01…250.00A
0.01A
0.00A
Info
The calculated primary current of the transformer's
LV side secondary current.
LV CT nom. to
TR nom. factor 0.01…250.00p.u.
0.01p.u. 0.00p.u. Info
The transformer's LV side calculated nominal to
the CT primary rate.
Transformer
nom.
impedance
0.01…250.00
Ω
0.01
Ω
0.00
Ω
Info
The calculated nominal impedance of the
transformer.
Transformer
nom. Zk
0.01…250.00
Ω
0.01
Ω
0.00
Ω
Info
The calculated nominal short-circuit impedance of
the transformer.
Transformer
nom. SC
inductance
0.001…250.000µH 0.01µH
0.000µH Info
The calculated nominal short-circuit inductance of
the transformer.
Transformer
ratio
0.01…250.00
0.01
0.00
Info
The transformer's calculated ratio (= HV/LV).
LV side max.
3ph SC curr.
0.001…500.000kA 0.001kA 0.000kA Info
The calculated maximum three-phase short-circuit
current in the LV poles of the transformer.
LV side 3ph
SC to HV side
0.001…500.000kA 0.001kA 0.000kA Info
Shows how the calculated maximum three-phase
short-circuit current in the LV side is seen in the
HV side.
LV side max.
2ph SC curr.
0.001…500.000kA 0.001kA 0.000kA Info
The calculated maximum two-phase short-circuit
current in the LV poles of the transformer.
LV side 2ph
SC to HV side
0.001...500.000kA
0.001kA 0.000kA Info
Shows how the calculated maximum two-phase
short-circuit current in the LV side is seen in the
HV side.
A
AQ
Q-T256
-T256
Instruction manual
Version: 2.06
92
© Arcteq Relays Ltd
IM00028
Summary of Contents for AQ-T256
Page 1: ...AQ T256 Transformer protection IED Instruction manual...
Page 2: ......