The current and voltage transformers for the neutral point and grid side are installed in the discharge fields on a project-specific basis. Additional components, e.g., for neutral point treatment or an excitation transformer, can also be installed. Short circuits near the generator cause very high short-circuit currents, which generate high electromagnetic forces and thermal effects. These can lead to the destruction of the affected components. For this reason, these fault scenarios are simulated in advance during the design of the discharge fields and taken into account in the design.
Features
| Max. rated current | 3,000 A |
| Peak current | 50 kA |
| Continuous short-circuit current | 7,1 kA |
| Max. rated voltage | 20 kV |
| Effective value of short-time alternating current | 20 kA |
| Standing alternating voltage | 50 kV |
Execution
- Indoor or outdoor installation
- Solid sheet steel or stainless steel housing
Machine connection
- Connection to the generator via busbar, single-conductor cable, or solid-insulated busbar.
- Optional delivery of the connection channel or busbar or cable connection to the machine.
Expansion and use
Individual, e.g. with:
- 3 + 1 current transformer on the mains side
- 3 + 1 current transformer at the star point
- 3 + 1 voltage transformer conductor - earth
- 1 voltage transformer conductor - conductor
- Power connection machine
- Star point formation in the control cabinet
- Provision and connection of all control and regulation variables of the machine via secondary terminal box
Type testing according to IEC 62271
IEC 62271-200
- Metal-clad alternating current switchgear for rated voltages above 1 kV up to and including 52 kV
DIN VDE 0101
- High-voltage systems with rated alternating voltages above 1 kV
DIN VDE 0141
- Grounding for special high-voltage installations with rated voltages above 1 kV
DIN EN 60694, VDE 0670, Teil 1000
- Common provisions for high-voltage switchgear Standards
IEC 62271-1 Section 6.2
- Partial dielectric test of the AC voltage test and lightning impulse voltage test
IEC 62271-1 Section 6.5
- Heating test up to 2750 A
Criteria 1 to 5 of IEC 62271-200: 2003-11
- Assessment of behavior in the event of internal errors
Options for expansion
- Star point resistors, grounding resistors
- Cable connection sockets for multi-conductor cables
- Interference protection capacitors
- Surge arresters