Annual Report 2011-2012

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Annual Research Report 2011-2012 Project Results: • Documentation of the information concerning the installation considerations of the partial discharge equipments in mines with difficult conditions. • Documentation of the experiences in challenging with installation of partial discharge equipments in mines. Project Documentation: • Information and technical specifications of 47 electromotors in Mes Sarcheshme complex. • Photos taken from the terminal box of 47 electric motors and generators • The investigation report of partial discharge in switchgears. • Installation report of partial discharge measuring equipments in Mes Sarcheshmeh complex. 7
Annual Research Report 2011-2012 Project Title: Consulting services in insulation assessment of Damavand power plant units through analysis and interpretation of the partial discharge measurement results and report Department: Electrical machines Employer: Damavand electrical power Generation Company Project manager: S. Gouran Project code:CEMTV01 Project staff: S. AminiValashani, A. Farshidnia, R. Sarafraz Project Summary: On-line partial discharge measurement of the stator winding insulation is one of the appropriate methods in fault diagnosis of the electrical generators insulation. Since this method is inexpensive, simple and nondestructive as well as enables to prepare useful information about generators insulation, it is suitable as a predictive fault diagnosis method. On the other hand, due to poor operating condition of electrical machines in power plants, because of the high contamination and different operating regimes, these machines, in the most cases, are subjected to insulation degradation and reducing the remaining life. The excessive degradation of insulation in electrical equipments, eventually, leads to electrical insulation fault and unexpected stop of the electrical motor or generator which can impose high cost in maintenance and lack of production. Nowadays, implementation of predictive operating and maintenance systems, which are on the basis of on-line monitoring and assessment of an equipment condition, has a key role in reducing the operating and maintenance cost along with increasing the system reliability. Accordingly, on-line monitoring of partial discharge in electrical equipments can help to decrease the cost of maintenance and lack of production using on-time diagnosis of different insulation defects. According to domestic production of the most of the electrical generators in Damavand power plant, its associate manager decided to prepare and installation of partial discharge measurement equipments. Since the interpretation of the measured data needs to high qualified personnel, it was decided to prepare a contract between NRI and Damavand power plant in order to cooperation between engineers of two companies in interpreting of PD measured data. The main objective of this contract was analyzing the PD measured data of 12 gas unit(s). After the primary coordination, the relevant units were tested every two months and the results were sent to NRI where the results were analyzed and a prepared report was sent to Damavand power plant. At the end of this process, six abstract and two detailed reports (were) sent to Damavand power plant. 8
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Annual Report 2011-2012

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