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If this calculated relative temperature is larger than the relative temperature level
corresponding to the set operate (trip) current a pickup output signal PICKUP is activated.
The actual temperature at the actual execution cycle is calculated as:
If
final
n
Q
> Q
EQUATION1172 V1 EN
(Equation 57)
(
)
1
1
1
t
n
n
final
n
e
t
D
-
-
-
æ
ö
Q = Q + Q
- Q
× -
ç
÷
è
ø
EQUATION1173 V1 EN
(Equation 58)
If
final
n
Q
< Q
EQUATION1174 V1 EN
(Equation 59)
(
)
1
t
n
final
final
n
e
t
D
-
-
Q = Q
- Q
- Q
×
EQUATION1175 V1 EN
(Equation 60)
where:
Q
n
is the calculated present temperature
Q
n-1
is the calculated temperature at the previous time step
Q
final
is the calculated final (steady state) temperature with the actual current
D
t
is the time step between calculation of the actual and final temperature
t
is the set thermal time constant Tau1 or Tau2 for the protected transformer
The calculated transformer relative temperature can be monitored as it is exported from
the function as a real figure HEATCONT.
When the transformer temperature reaches any of the set alarm levels
Alarm1
or
Alarm2
the corresponding output signals ALARM1 or ALARM2 are activated. When the
temperature of the object reaches the set trip level which corresponds to continuous
current equal to
ITrip
the output signal TRIP is activated.
There is also a calculation of the present time to operation with the present current. This
calculation is only performed if the final temperature is calculated to be above the
operation temperature:
Section 8
1MRK 502 048-UUS A
Current protection
238
Technical manual
Содержание 650 series
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