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Punekar, Gururaj S.
- On estimation of rate of change of frequency for relay settings during power export to grid from a CPP
Authors
1 Student, Dept. of EEE, National Institute of Technology, Surathkal Karnataka, IN
2 Manager (Electrical), CPP, Mangalore Chemicals and Fertilizers Ltd., Panambur, Mangaluru, Karnataka, IN
3 Assoc. Professor, Dept. of EEE, National Institute of Technology, Surathkal. Karnataka, IN
Source
Power Research, Vol 13, No 2 (2017), Pagination: 319-326Abstract
Amendments in the Indian Electricity Act in 2003, has opened up the Power Industry to make profitable business. Further, the acute shortage of power in India, can only be addressed by increasing the power generation and allowing smaller capacity distributed generation systems to interconnect to the grid. A captive power plant (CPP) associated with the fertilizer manufacturing sector is contemplating pumping its spare generation to the grid. This requires a study and settings of relays for protection of equipment associated with the CPP. On connecting to the grid the faults within the network may lead to either overloading or over speeding up of CPP generators. This requires a protective mechanism to isolate and island. This in turn is possible using quick response relays which are based on change in frequency or changes in load angle. By studying the related machine and system parameters, the effort is made to evolve the settings of such frequency based relay for the CPP under study. Using the swing equation as the basis along with related system parameters of the CPP and grid, the process of evolving the settings of Rate of Change of Frequency (RoCoF) and Vector Surge Relay (VSR) is discussed in this paper.Keywords
Captive power plant; Grid connection; Loss of mains; Frequency; Rate of change of frequency; Power export; RoCoF relay; Relay settings; Voltage surge relay
- On Choice of Velocity for Acoustic-emission Linear-source-localizationin Metallic Medium
Authors
1 Student, Department of Electrical and Electronics Engineering, National Institute of Technology, Surathkal Karnataka - 575025, IN
2 Associate Professor, Department of Electrical and Electronics Engineering, National Institute of Technology, Surathkal Karnataka - 575025, IN
Source
Power Research, Vol 11, No 4 (2015), Pagination: 689-696Abstract
Acoustic emission (AE) testing is a recognized Nondestructive Test (NDT) to detect and locate flaws in mechanically loaded structures. As the component is subjected to mechanical loading, discontinuities in the components release energy, part of which is converted to sound. In this paper an experiment is conducted to detect and locate the source of acoustic emission (due to pencil lead break test) on a metallic strip. The knowledge of velocity with which the AE signals travel in the metal medium is very crucial in detecting the exact location of the AE source. The effect of velocity error in location detection is studied by conducting ‘event’ analysis with different velocities, using experimental data. This experiment uses the principle of difference in arrival time of the AE signal at each sensor for location detection. Results are supposed to give better understanding of AE based Partial Discharge (AEPD) anlysis, which involve structure borne paths.Keywords
Acoustic emission, events, linear location, metallic strip, pencil lead- Computed Lightning Electric Field Ratios of First and Subsequent Return Strokes
Authors
1 Research Student, Dept. of E&E, NITK, Surathkal, Mangalore - 575025, IN
2 Associate Professor, Dept. of E&E, NITK, Surathkal, Mangalore - 575025, IN
Source
Power Research, Vol 9, No 1 (2013), Pagination: 53–62Abstract
Electromagnetic fi elds generated due to ‘typical’ fi rst return stroke (FS) and subsequent lightning return stroke (SS) have been computed and compared. The simulation results are discussed keeping in view the fi eld data reported in several recent literature, which compares the severity of fi rst and subsequent return strokes. The MTLE based engineering model is adopted to compare the severity of lightning return strokes (FS/SS) as a function of radial distance and the worst case ground conductivity.
In general, the magnitude of electric field peak due to of first return stroke is nearly twice that of field peak due to subsequent return stroke as reported in the literature, based on the data collected by lightning detection, information and field measurement systems. The present simulation results not only substantiate this fact but also try and assess few parameters responsible for low ratio of FS/SS (reported in some cases) through simulation process; as causes for these low ratios are yet to find satisfactory explanation.