Table. 5.4.28 - 228. General settings (not selectable under setting groups)
Name
Range
Default
Description
TT> LN
mode
1: On
2:
Blocked
3: Test
4: Test/
Blocked
5: Off
1: On
Set mode of TOLT block.
This parameter is visible only when
Allow setting of individual LN mode is enabled in
General menu.
TT> mode
0:
Disabled
1:
Activated
0:
Disabled
The selection of the function is activated or disabled in the configuration. By default it is
not in use.
Temp C or
F deg
0: C
1: F
0: C
The selection of whether the temperature values of the thermal image and RTD
compensation are shown in Celsius or in Fahrenheit.
Table. 5.4.28 - 229. Settings for thermal replica.
Name
Range
Step
Default
Description
IN
thermal
cap
current
0.10…40.00xI
n
0.01xI
n
1.00xI
n
The current for the 100 % thermal capacity to be used (the pick-up current in
p.u., with t
max
achieved in time τ x 5).
tau h (t
const)
0.1…500.0min
0.1min 10.0min
The τ
h
time constant setting. This time constant is used for the heating of the
protected object.
tau c (t
const)
0.1…500.0min
0.1min 10.0min
The τ
c
time constant setting. This time constant is used for the cooling of the
protected object.
k
SF
(service
factor)
0.01…5.00
0.01
1.00
The service factor which corrects the value of the maximum allowed current
according to installation and other conditions varying from the
presumptive conditions.
Cold
reset
default
theta
0.0…150.0%
0.1%
60.0%
The thermal image status in the restart of the function or the device. The
value is given in percentages of the used thermal capacity of the protected
object. It is also possible to reset the thermal element.
This parameter can be used when testing the function to manually set the
current thermal cap to any value.
Table. 5.4.28 - 230. Environmental settings
Name
Range
Step
Default
Description
Object
max.
temp.
(t
max
=
100%)
0…500deg
1deg
90deg
The maximum allowed temperature for the protected object. The default
suits for Celsius range and for PEX-insulated cables.
Ambient
temp. sel.
0: Manual set
1: RTD
-
0:
Manual
set
The selection of whether fixed or measured ambient temperature is used
for the thermal image biasing.
Man.
amb.
temp. set
0…500deg
1deg
15deg
The manual fixed ambient temperature setting for the thermal image
biasing. Underground cables usually use 15 °C. This setting is visible if
"Manual set" is selected for the "Ambient temp. sel." setting.
RTD amb.
temp.
read.
0…500deg
1deg
15deg
The RTD ambient temperature reading for the thermal image biasing.
This setting is visible if "RTD" is selected for the "Ambient temp. sel."
setting.
Ambient
lin. or
curve
0: Linear est.
1: Set curve
-
0:
Linear
est.
The selection of how to correct the ambient temperature, either by
internally calculated compensation based on end temperatures or by a
user-settable curve. The default setting is "0: Linear est." which means
the internally calculated correction for ambient temperature.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
277
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
