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The quality of power transformer insulation system is evaluated on a routine basis by measurement of the dielectric dissipation factor and capacitance of the insulation system. The use of dielectric dissipation factor measurements at the end of the production cycle not only assures that the quality of the transformer meets the specified levels but also provides insight into the subtleties of the manufacturing...
FRA is used to determine the mechanical and electrical integrity of the core and the windings of power transformers. It can be used to detect core movement, winding movement, open circuits, short circuits and problems related to core ground. Various practical case studies demonstrate the effectiveness of this technique. This paper will demonstrate the effect of change in moisture content on the resonance...
In the development of metallized film power capacitors, accelerated aging experiments are carried out in order to predict the lifetime of a capacitor under nominal operating conditions. For metallized film capacitors the decrease of capacitance with time is very small even in accelerated aging. Consequently, these experiments require extremely precise measurement methods for the capacitance. We have...
Distribution network system owners and managers are increasingly more conscious on the significance of their ability to improve the condition and reliability of their network system. A combination of pertinent diagnostic testing are sought after for condition assessment. Adoption of the most appropriate diagnostic system between the one that are already developed and practiced and others that are...
Sweep Frequency Response Analysis for condition monitoring of power transformer is today a general accepted technique to identify faults in a transformer. The aim of this paper is to assess the possibility of generating transfer functions which could be realized into networks using the circuit synthesis approach. In circuit synthesis the transfer function has to satisfy the conditions of positive...
This paper proposes a partial discharge analysis in cylindrical insulators model for finding electrical parameters. There are three types of electric insulator, namely liquid, solid and gas insulator. The capacitance, dielectric loss factor (tandelta) are found by measuring PD Pattern of each insulator. The power dielectric loss (Pd) of each electric insulator also calculates by using the result of...
Insulator strings in transmission system are subjected to direct weather during its service. The withstandability to the weather is different for each insulator in a string. The withstand-ability of an insulator drops due to defect on the surface and or internal the insulator. Defect on the surface can be observed by using an visual detector such as daycor corona meter, however the internal defect...
The arcing current signals during the breaking and making operation of switches are measured for monitoring the opening and closing process. A current transducer based on Rogowski coil is developed to detect the arcing current with a wide bandwidth of 3 Hz to 7.54 MHz. Experiments were performed with switching containing resistance, inductance, and capacitance load respectively. Under the opening...
Sweep Frequency Response analysis (SFRA) is a widely used technique for condition assessment of power transformers and reactors. With SFRA, it is possible to analyze the integrity of transformer without prior dismantling. Changes in geometric configuration change the impedance of network which in turn changes the transfer function. Changes in transfer function will reveal a wide range of failure modes...
In this paper a simulation model for a three-phase, three-limb core-type 1000 MVA 400/275/13 kV autotransformer is presented to study Frequency Response Analysis (FRA). The equivalent electric circuit of the magnetic core is derived based on the Principle of Duality. Leakage inductances and capacitances of windings are also included in the model. All the parameters are determined using manufacturer...
In this paper an algorithm for PD localization based on using multi-conductor transmission line model is introduced. In this algorithm sectional winding transfer functions are computed using the winding model. To calculate the parameters of the model including resistances, inductances and capacitances between different turns of the winding, it is necessary to have design data of the transformer. Since...
The overall booming industry has great need for electrical industry. Hence, electrical power generation, transmission and distribution have to respond to the continuously growing demand by e.g. increased transmission capacities or trans-mission voltages but also by longer transmission networks. Hereby, the more and more demanding requirements for devices of power transmission and distribution have...
This present work proposed the compact Tesla transformer which could generate voltage up to 155 kVp with variable frequency between 120-430 kHz. Its size was 1.40 m in length and 0.35 m in width. This Tesla transformer set consisted of a 220V/15 kV transformer, a quenching gap, a capacitor which can withstand the voltage up to 36 kVp and windings used air as insulator. The capacitance was 44 nF which...
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