Setting Example - ABB REC670 Applications Manual

1MRK 511 401-UUS A
17.11.3
17.11.3.1
Bay control REC670 2.2 ANSI
Application manual
• Top oil temperature = 120°C
• Hot spot winding temperature = 200°C
• Short-time loading (1/2 h or less) = 300%
• For power transformer with 65°C hot spot temperature rise:
• Top oil temperature = 110°C
• Hot spot winding temperature = 180°C
• Maximum loading = 200%
Settings related to warning and alarm are:
WrnHPTmpLev1: This setting is used to set the level 1 value for hot spot temperature
warning.
WrnHPTmpLev2: This setting is used to set the level 2 value for hot spot temperature
warning. This should be more than the WrnHPTmpLev1 setting.
tDelayToAlarm1: This setting is used to set the time delay for the level 1 hot spot
temperature alarm. This time setting can be less than the winding time constant. For
example if the winding time constant is 420 sec, this setting can be 400 sec.
tDelayToAlarm2: This setting is used to set the time delay for the level 2 hot spot
temperature alarm. This should be less than time setting in tDelayToAlarm1.

Setting example

Transformer Rated Data
Table 53: Transformer Rated Data
Parameter
Frequency
Rated Power
Voltage ratio
Tap changer
Winding 1 rated current
Winding 2 rated current
Winding 3 rated current
Connection Type
Cooling
p.u. Impedance
At Base
Table continues on next page
Value
50 Hz
500 MVA / 500 MVA / 20 MVA
415 kV / 230 kV / 20 kV
±9
696 A
1255 A
577 A
YNyn0d1
ONAF
0.120
500 MVA
Section 17
Monitoring
GUID-B3AE440F-CC5E-4742-9483-8D6448A476C8 v1
Note
1.67% of 230 kV
559