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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
A
and rated current I
N
and on the voltage dip (up to approximately
20%) while the machine is starting up:
Table 4-1
Power limits
Rated voltage V
N
Power limit
3 kV
750 kW
6 kV
1500 kW
10 kV
2500 kW
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
down in EN 50110‑1 regarding safe operation of electrical equipment.
Preparations for use
4.9 Switching high-voltage motors
SIMOTICS HV C 1NA14544WA600AG0-Z
24
Operating Instructions 06/2018
Содержание Simotics HV C 1NA14544WA600AG0-Z
Страница 2: ...14 06 2018 09 34 V3 00 ...
Страница 10: ...Table of contents SIMOTICS HV C 1NA14544WA600AG0 Z 10 Operating Instructions 06 2018 ...
Страница 74: ...Operation 8 9 Faults SIMOTICS HV C 1NA14544WA600AG0 Z 74 Operating Instructions 06 2018 ...
Страница 90: ...Maintenance 9 3 Corrective Maintenance SIMOTICS HV C 1NA14544WA600AG0 Z 90 Operating Instructions 06 2018 ...
Страница 98: ...Disposal 11 4 Disposal of components SIMOTICS HV C 1NA14544WA600AG0 Z 98 Operating Instructions 06 2018 ...
Страница 100: ...Service and Support SIMOTICS HV C 1NA14544WA600AG0 Z 100 Operating Instructions 06 2018 ...
Страница 104: ...Quality documents SIMOTICS HV C 1NA14544WA600AG0 Z 104 Operating Instructions 06 2018 ...
Страница 106: ...Additional documents SIMOTICS HV C 1NA14544WA600AG0 Z 106 Operating Instructions 06 2018 ...
Страница 110: ...Index SIMOTICS HV C 1NA14544WA600AG0 Z 110 Operating Instructions 06 2018 ...
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