ABB Relion 670 Series Applications Manual page 520

Section 18
Monitoring
Setting
CurrTypeTestW1
CurrTypeTestW2
CurrTypeTestW3
EnaAgeCalc
InitialLife
ExpectedLife
AgeingRateMeth
ThermalUpgrade
TimeToUpdate
WrnHPTmpLev1
WrnHPTmpLev2
tDelayToAlarm1
tDelayToAlarm2
18.12 Through fault monitoring PTRSTHR
18.12.1 Identification
Function description
Through fault monitoring
18.12.2 Application
The through fault monitoring function PTRSTHR is used to monitor the mechanical stress on a
transformer and place it against its withstand capability. During through faults, the fault-
current magnitude is higher as the allowed overload current range. At low fault current
magnitudes which are below the overload capability of the transformer, mechanical effects are
considered less important unless the frequency of fault occurrence is high. Since through fault
current magnitudes are typically closer to the extreme design capabilities of the transformer,
mechanical effects are more significant than thermal effects.
The point of transition between mechanical stress and thermal stress cannot be precisely
defined. However, mechanical stresses tend to have a prominent role in larger kilovolt-amps
ratings, since the currents are higher. It is important to identify all transformer through faults,
capture the energy profile of each individual through fault, and ascertain the consequences of
aggregate effects to the transformer.
According to IEEE C57.12.00-1993 standard, transformers rated over 10 MVA come under
category IV. For these transformers, a single curve represents both thermal and mechanical
damage considerations. The recommended duration limit is based upon the curve in
251. The validity of these damage limit curves cannot be demonstrated by tests since the
514
Short Description
Set the current applied to the winding
1 during type test
Set the current applied to the winding
2 during type test
Set the current applied to the winding
3 during type test
Enable the transformer insulation loss
of life calculation
Set the initial loss of insulation life
Set the expected life of the
transformer
Select the ageing rate method of
calculation
Select the transformer insulation
paper type
Set the time interval for the update of
loss of life outputs
Set the hot spot temperature value for
the level 1 warning
Set the hot spot temperature value for
the level 2 warning
Set the time delay for the alarm level 1
Set the time delay for the alarm level 2
IEC 61850
identification
PTRSTHR
© Copyright 2017 Hitachi Power Grids. All rights reserved
Selected value
696.0 A
1255.0 A
577.0 A
Enable
0.0 Hours
1, 80,000 Hours
IEC
Upgraded
1 Hour
110° C
120° C
1800 sec
900 sec
GUID-7AE60CB5-3CD5-4FE2-8D54-664AA78DD2DE v1
GUID-B62A30E5-C1F3-4E1F-B351-4F4CC60BA53F v1
IEC 60617 ANSI/IEEE C37.2
identification device number
- 51TF
GUID-A859F4D6-635E-4116-9416-EF50948FA6C9 v1
1MRK 511 401-UEN Rev. K
Figure
Bay control REC670
Application manual