•
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
.
17.11.3
Setting example
17.11.3.1
Transformer Rated Data
GUID-B3AE440F-CC5E-4742-9483-8D6448A476C8 v1
Table 53:
Transformer Rated Data
Parameter
Value
Note
Frequency
50 Hz
Rated Power
500 MVA / 500 MVA / 20 MVA
Voltage ratio
415 kV / 230 kV / 20 kV
Tap changer
±9
1.67% of 230 kV
Winding 1 rated current
696 A
Winding 2 rated current
1255 A
Winding 3 rated current
577 A
Connection Type
YNyn0d1
Cooling
ONAF
p.u. Impedance
0.120
At Base
500 MVA
Table continues on next page
1MRK 511 401-UUS A
Section 17
Monitoring
Bay control REC670 2.2 ANSI
559
Application manual
Summary of Contents for Relion REC670
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