1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
301
Technical Manual
the share of the steep part of the heating curve. When
Weighting factor p
=1, only
Short-time constant
is used. When
Weighting factor p
= 0, only
Long time constant
is used.
Figure 144:
Effect of the
Weighting factor p
factor and the difference between the
two time constant and one time constant models
The actual temperature of the transformer is calculated by adding the ambient temperature
to the calculated temperature.
(Equation 19)
Θ
temperature in transformer (°C)
ΔΘ calculated temperature rise (°C) in transformer
Θ
amb
set
Env temperature Set
The
Env temperature Set
setting is used to define the ambient temperature.
The temperature calculation is initiated from the value defined with the
Initial temperature
setting. This is done when the IED is powered up or the function is “disabled” and “enable”
or reset through the Clear menu. The temperature is stored in a non-volatile memory and
restored if the IED is restarted.
The
Max temperature
setting defines the maximum temperature of the transformer in
degrees Celsius (°C). The value of the
Max temperature
setting is usually given by
transformer manufacturers. The actual alarm, operating and lock-out temperatures for 49T
are given as a percentage value of the
Max temperature
setting.
When the transformer temperature reaches the alarm level defined with the
Alarm
temperature
setting, the
ALARM
output signal is set. When the transformer temperature
reaches the trip level value defined with the
Operate temperature
setting, the
TRIP
output
is activated. The
TRIP
output is deactivated when the value of the measured current falls
Θ
Θ Θ
= Δ +
amb
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Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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