Documents

IEEE.docx

Description
Challenges Associated With Assessment and Testing of Fault Ride-Through Compliance of Variable Power Generation in Australian National Electricity Market Abstract - A method and a computer program for interpreting soil measurement data are presented. The method employs a statistical estimation of soil parameters from four pin or three pin measurements. The analysis provides (1) the best estimate of soil parameters, (2) the error of the parameters versus confiden
Categories
Published
of 2
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
  Challenges Associated With Assessment and Testing of Fault Ride-Through Compliance of Variable Power Generation in Australian National Electricity Market Abstract - A method and a computer program for interpreting soil measurement data are presented. The method employs a statistical estimation of soil parameters from four pin or three pin measurements. The analysis provides (1) the best estimate of soil parameters, (2) the error of the parameters versus confidence level, (3) a pictorial view of how well the estimated soil model fits the measurements, and (4) the measurements which are not consistent (bad measurements). The methodology is applicable to data obtained with four or three pin method over a small or a large area. It performs best when applied to measurements taken at various locations of the area of interest. A computer program has been developed based on this methodology with the symbolic name SOMIP (SOil Measurements Interpretation Program). Implementation details are discussed in this paper. The performance of the methodology is compared with test model data. In addition, the experience gained in interpreting soil resistivity measurement with the program SOMIP is presented in this paper. Specifically, many sets of actual data, taken from four major utilities, has been analyzed and the results are presented and discussed. Characterization of Static Electrification in Power Transformers ABSTRACT Static electrification due to oil flow causes many field failures of large forced-oil cooled power transformers. Also, in practice under normal operating conditions, the oil volume in these power transformers is reduced due to the internal heat generated (from the energized windings) which accelerates the chemical processes occurring inside. To complete filling of the oil tanks of such transformers, either new oil of the same or different type is used. Laboratory analogs of these transformers; namely a closed and an open cycle, have been used for investigating this phenomenon. Such tests have been performed upon different types of fresh and aged oils and oil mixtures to measure the electrification current. Investigations of the effect of oil temperature, oil velocity, frequency and type of the applied voltage, type of the solid-phase material, and the length of the oil gap are introduced. Also, a 200 kVA, 3.3 kVl380 V distribution power transformer is used where the oil is forced and heated externally to examine and demonstrate this phenomenon for unenergized and energized cases and for both fresh and aged oils. SOME ACCESSORY APPARATUS FOR PRECISE MEASUREMENTS OF ALTERNATING CURRENT. SUMMARY. The paper describes apparatus for obtaining for purposes of measurement a voltage  proportional to, and in phase with, a given alternating current. The Introduction outlines defects  in the water-cooled tube resistors which have been in use at the National Physical Laboratory for this purpose; these defects have led to the construction of air-cooled resistors for moderate currents, and current transformers with nickel-iron cores for heavy currents. Section (1) deals with the requirements for the air-cooled resistors, and with theoretical and practical points in their design; tests showing very satisfactory performance are described. Section (2) outlines the construction of the special current transformers, and deals at some length with the method of calibrating hem. Finally, the effects of a number of variables on the transformer performance are investigated: the characteristics are shown to be very good, and no sign of instability is found.  
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks