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ln
final
operate
operate
final
n
t
t
æ
ö
Q
- Q
= - × ç
÷
ç
÷
Q
- Q
è
ø
EQUATION1176 V1 EN
(Equation 61)
The calculated time to trip can be monitored as it is exported from the function as a real
figure TTRIP.
After a trip, caused by the thermal overload protection, there can be a lockout to reconnect
the tripped circuit. The output lockout signal LOCKOUT is activated when the
temperature of the object is above the set lockout release temperature setting
ResLo
.
The time to lockout release is calculated, That is, a calculation of the cooling time to a set
value.
_
_
ln
final
lockout release
lockout release
final
n
t
t
æ
ö
Q
- Q
= - × ç
÷
ç
÷
Q
- Q
è
ø
EQUATION1177 V1 EN
(Equation 62)
In the above equation, the final temperature is calculated according to equation
. Since
the transformer normally is disconnected, the current I is zero and thereby the Θ
final
is also
zero. The calculated component temperature can be monitored as it is exported from the
function as a real figure, TRESLO.
When the current is so high that it has given a pickup signal PICKUP, the estimated time
to trip is continuously calculated and given as analog output TTRIP. If this calculated time
get less than the setting time Warning, set in minutes, the output WARNING is activated.
1MRK 502 048-UUS A
Section 8
Current protection
239
Technical manual
Summary of Contents for 650 series
Page 1: ...Relion 650 series Generator protection REG650 ANSI Technical manual ...
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Page 62: ...56 ...
Page 68: ...62 ...
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