Compact dc link
- General Electric Co., Malvern, PA (United States)
The EPRI Compact Substation Project (a HVDC Converter Station) was developed, designed, and constructed per EPRI Agreement RP213. In December 1983, the converter station operated at its rating (100 MW power transmission and 300 kV dc bias plus 100 kV operating voltage). From January to May 1984, the converter station operated at various power transmission levels. Operation was intermittent due to a randomly occurring voltage breakdown. The voltage breakdown was isolated to the steel tanks containing the thyristor valves in an SF{sub 6} environment. The type of insulators stressed within the valve tanks were: (1) the epoxy cone shape insulators providing an interface to the bus entering the valve tank; (2) epoxy fiberglass hydraulic columns for the flow of the R113 refrigerant to and from the thyristor valves; and (3) the epoxy fiberglass support columns supporting the thyristor valves from the floor of the valve tank. The cause of the randomly occurring breakdown was investigated and determined to be the epoxy fiberglass support columns. The random dielectric breakdowns were due to excessive voltage gradients existing at the epoxy fiberglass support columns. This probably was caused by the misplacement of an internal insert within the column with respect to an external shield on the column. The cost and time to retrofit the support columns outweighed the benefits expected from resuming the project. Consequently, work was terminated and the equipment disassembled. Examination of the epoxy fiberglass support columns revealed several arcing tracks along the inside surface confirming the earlier hypothesis. 53 figs., 32 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); General Electric Co., Malvern, PA (United States)
- Sponsoring Organization:
- EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 5079910
- Report Number(s):
- EPRI-EL-7101
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
240202* -- Power System Networks
Transmission & Distribution-- DC Systems-- (1990-)
ANALOG-TO-DIGITAL CONVERTERS
BREAKDOWN
CHALCOGENIDES
COMPOSITE MATERIALS
CONSTRUCTION
CONTROL EQUIPMENT
DC SYSTEMS
DESIGN
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
ELECTRICAL INSULATION
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
ENERGY SYSTEMS
EPOXIDES
EQUIPMENT
FAILURES
FIBERGLASS
FLOW REGULATORS
FLUORIDES
FLUORINE COMPOUNDS
GAS-INSULATED SUBSTATIONS
HALIDES
HALOGEN COMPOUNDS
HVDC SYSTEMS
INSULATING OILS
MATERIALS
MECHANICAL STRUCTURES
OILS
OPERATION
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWER SUBSTATIONS
POWER SYSTEMS
SEMICONDUCTOR DEVICES
SIZE
SULFUR COMPOUNDS
SULFUR FLUORIDES
SUPPORTS
TESTING
THYRISTORS
VALVES
ZINC COMPOUNDS
ZINC OXIDES