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Preparations for use
4.9 Switching high-voltage motors
4.9
Switching high-voltage motors
If vacuum circuit breakers and vacuum contactors are used, then what are known as multiple
restrikes can occur when the machine is switched off. This depends on various factors, such
as:
● Arc-extinguishing principle of the switch
● Machine size
● Length of the power supply cable
● System capacitance, etc.
A surge suppressor to ground is installed in the switchgear between the circuit breaker and
the cable termination for each of the three conductors. The level of protection for the machine
windings is sufficient when the limiter is correctly selected (machine rated voltage / response
voltage).
Example
This current limit corresponds to the following upper power limits, depending on the relationship
between the starting current I
20%) while the machine is starting up:
Table 4-1
See also
Prior to commissioning (Page 59)
4.10
Thermal protection
The machine is equipped with measuring equipment to directly monitor the motor temperature
to protect the machine against overheating during operation. Plan a corresponding circuit for
monitoring. More information is provided in Technical Data.
4.11
Transport and storage
Observe the following when carrying out any work on the machine:
● Comply with the general safety instructions (Page 13)
● Comply with the applicable national and sector-specific regulations.
● When using the machine within the European Union, comply with the specifications laid
24
Power limits
Rated voltage V
3 kV
6 kV
10 kV
down in EN 50110‑1 regarding safe operation of electrical equipment.
and rated current I
and on the voltage dip (up to approximately
A
N
N
Power limit
750 kW
1500 kW
2500 kW
SIMOTICS HV C 1NA14544WA600AG0-Z
Operating Instructions 06/2018
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