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R. S., Shivakumara Aradhya
- Investigation on Flashover Performance of 25 kV Traction System Section Insulator Assembly in DMRCL System
Authors
1 High Voltage Division, Central Power Research Institute, Bangalore - 560 080, IN
2 DMRCL, Metro Bhavan, 6th Floor, Fire Brigade Lane, Barakhamba Road, New Delhi - 110 001, IN
Source
Power Research, Vol 9, No 2 (2013), Pagination: 183–190Abstract
This paper describes the failure analysis of a section insulator assembly at one of the depot of Delhi Metro Rail Corporation Limited (DMRCL). Frequent breaker tripping at Saritavihar depot of DMRCL due to flashover of the section insulator assembly was observed; the cause of failure of the section insulator was investigated and presented in this paper. As a first step laboratory tests on new and used section insulator assemblies were conducted to make comparative analysis, and then simulation studies were carried out to estimate the possible over voltages during different switching operations and their relationship with the test voltages used in the experimental investigation. This paper presents the laboratory experiments and simulation studies for the failure analysis of section insulator assembly of DMRCL.Keywords
Section Insulator, Electric Traction, Insulation Level and Impulse Testing
- Dynamic Compensation Studies using RTDS for Large Wind Farm Integration with Grid
Authors
1 Joint Director, Powers Systems Division, CPRI, Bangalore - 560080, IN
2 Additional Director, High Voltage Division, CPRI, Bangalore - 560080, IN
Source
Power Research, Vol 9, No 1 (2013), Pagination: 1–8Abstract
Amongst all renewable energy sources so far identifi ed in India for commercial exploitation, wind energy is the one, which has been found to be more viable for generation of grid quality power. Following recent growth of wind generation, utilities have responded by developing various interconnection requirements/guidelines to which the wind farm must abide. The guidelines provide for penalty to be levied by State Electricity Boards, if the projects fail to achieve minimum monthly average power factor of specifi ed value at the coupling point. Suitable penalties are also levied for reactive power to discourage drawl of reactive power from the grid and to avoid free wheeling of the machine.
Majority of wind generator topologies are asynchronous machines, which draws reactive power from the grid. Thus, there is a requirement that the wind farms be self suffi cient with respect to the needs of reactive power of the wind farm. The methods of reactive power control may be provided in the form of capacitor banks, static power converter based devices (SVC, TSC, or STATCOM) or by employing machines capable of reactive power control, such as the doubly-fed induction machine topology.
This paper discusses the results of grid integration studies of wind farms, based on three phase dynamic simulation utilizing the real time digital simulator (RTDS). It investigates the application of STATCOM for a typical wind farm for providing an effective means in dynamic voltage control of the wind farm, meet the reactive power requirements of the wind farm and enhance the capability of the wind farm to ride through the grid disturbances.