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| Statoric
Resistors |
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- Standard
:
- Power
from 0 to 600kW
-
Start-up time : 6, 8, 12, 15 et 30 secondes
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2 consecutive starts or 10 starts/hour
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Direct start-up
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Start-up with resistor
- Individual
calculations for specail specifications to be specified
- Contractors
can be integrated
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| Technical
Data needed to design the resistors |
Asynchronous
squirrel cage motors
|
| Parameter |
Unit
|
Comment |
| Power |
kW
|
power
of the motor |
| Un |
V
|
nominal
voltage |
| Iflc |
A
|
nominal
current |
| Tsc/Tn |
%
|
short
circuit torque/ nominal torque |
| Isc/Iflc |
%
|
short
circuit current/ nominal current |
| Service |
|
nature
of the cycle(s) carried by the motor |
| Time |
Sec
|
duration
of the starting cycle |
| Rotoric
Resistors |
|
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- Individual
calculations using the following data to be specified :
-
Power (kW)
- Rotor
voltage
-
Rotor current
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Number of start-up steps
-
Peak at the first steps
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Start-up time or inertia of the machine being driven and speed
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High duty service
-
Number and duration of starts/hour
- Contractors
can be integrated
|
| Technical
Data needed to design the resistors |
Asynchronous
squirrel cage motors
|
| Parameter |
Unit
|
Description/
Comment |
| Power |
kW
|
power
of the motor |
| Ur |
V
|
rotoric
voltage |
| Ir |
A
|
rotoric
current |
| Duty
Cycle |
|
nature
of the cycle(s) carried by the motor |
| Number
of Sections |
|
for
starting and braking |
| Ts/Tn |
|
starting
torque/ nominal torque |
| Driven
Machine |
|
|
| Time |
Sec
|
duration
of the starting cycle |
Choice
criteria
-
High start-up and braking frequency.
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Long start-up or braking duration.
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Harsh industrial environment, e.i. : H2S,
high temperatures...
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No limit of power or voltage.
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Speed control, start-up, braking, electro-carriers.
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A.C. generator inductors discharge, electro-carriers.
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We can replace all units of the following brands : La Mécano
FranÇaise, SEIEM, GEC France, FILTREX, TOLREX.
Gridex
|
METALLIC RESISTORS |
 |
Gridex
U :
For standard applications, no matter whether the period of operation
is short or long, Gridex U resistors combine the thermal capacity
of Gridex G resistors and the technical characteristics of Gridex
N and F resistors, although their design is less complicated. Gridex
U resistors consist of solid strips, extra-extended diamond meshes
and lateral stiffeners. |
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Gridex N et F :
When the current transit through the resistor provokes heat dissipation
into the surrounding environment (non-adiabatic heating), the resistor
must be designed to optimize heat exchanges. This is the case of
Gridex N and F resistors. Gridex N resistors are intended for natural
ventilation, Gridex F resistors for forced ventilation. |
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Gridex G :
When a resistor does not produce any significant heat exchange with
the surrounding environment (adiabatic heating) when heated, it
should have as great a mass as possible. This is the case of Gridex
G resistors, which consist of steel sheetmetal elements cut into
rectangles and mounted in staggered configuration. |
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Gridex T :
The Gridex T resistors are made of woven resistive elements. The
chain warp thread wire is not conductive, the weft thread is resistive.
This technology allows high resistance values (reaching hundreds
of ohms) and can be adapted to high voltage application (continuous
or transient) |
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