Annual Report 2011-2012

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.
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