Fleet Asset Management Opportunities Arising from Transient Monitoring of Power Transformers and Shunt Reactors

Abstract

Power transformers and shunt reactors are strategic assets for every system operator and their downtime should be kept as low and controlled as possible. During their multi-decade service life, they are regularly exposed to transient overvoltages. These situations stress their insulation systems and can cause accelerated deterioration and aging. Since the shapes of these overvoltages are usually unknown, an additional approach to assessing the health index can be realized using monitoring systems with transient recorders. Analyzing the transient overvoltages using frequency domain severity factor, a quantification of additional stress on the transformer’s/shunt reactor’s insulation can be given. This can help in assessing the current state of the insulation system and can lead to more advanced fleet asset management.

Integral Approach for Overvoltage Management Based on Field Data and Modelling

“…The system is already installed and operates on different locations in Croatian transmission system. The performance check of the system has been done in both frequency and time domain [10], [16]. In [16], the system was tested in the high voltage laboratory for SI, LI and LIC on 100 MVAr 220 kV shunt reactor, while in [10] the system was tested against the simulation results of transferred overvoltage, caused by lightning.…”

“…The performance check of the system has been done in both frequency and time domain [10], [16]. In [16], the system was tested in the high voltage laboratory for SI, LI and LIC on 100 MVAr 220 kV shunt reactor, while in [10] the system was tested against the simulation results of transferred overvoltage, caused by lightning. The simulation included wideband black box power transformer model in EMTP.…”

“…The system is already installed locations in Croatian transmission system. The performance check of in both frequency and time domain [10], [16]. In [16], the system was laboratory for SI, LI and LIC on 100 MVAr 220 kV shunt reactor, was tested against the simulation results of transferred overvoltage, simulation included wideband black box power transformer model in tinuously measured in 220/110 kV substation, the same substation as ious section.…”

“…The performance check of in both frequency and time domain [10], [16]. In [16], the system was laboratory for SI, LI and LIC on 100 MVAr 220 kV shunt reactor, was tested against the simulation results of transferred overvoltage, simulation included wideband black box power transformer model in tinuously measured in 220/110 kV substation, the same substation as ious section. The observed events have occurred from May 2020 until a period of the year with most severe lightning activity.…”