An Ultracapacitor Integrated Power Conditioner for Intermittency Smoothing and Improving Power Quality of Distribution Grid

2014 ◽  
Vol 5 (4) ◽  
pp. 1145-1155 ◽  
Author(s):  
Deepak Somayajula ◽  
Mariesa L. Crow
Keyword(s):  
Power Quality ◽  
Distribution Grid ◽  
Power Conditioner

Analysis Of Power Quality Effect On The Life Time Transformer

2019 ◽  
Vol 5 (1) ◽  
pp. 57-64
Author(s):  
Jepi Yuli Hindarianto
Keyword(s):  
Power Quality ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Transformer Oil ◽  
Gas Content ◽  
Distribution Grid ◽  
Dissolved Gas ◽  
Industrial Facility ◽  
Step Down

In the industry that runs today, of course, electricity cannot be separated from the electricity used for all production processes. In Indonesia, currently PT. PLN (Persero) (PLN) is the only one of electrical energy provider for the medium and larger scale of industry. The electricity power for industry is usually supplied by 20 kV distribution grid. Meanwhile, industrial utilities, equipment and machinery mostly require lower voltage. Therefore, it is necessary to step down the voltage of the PLN distribution grid from 20 kV to 2 kV, 1 kV, 400 Volt or lower by using step down transformer. Step down transformer has very important role in any industrial facility. Failure and under performance in the maintenance and operation of step down transformer will cause significant effect to the continuation of industrial facility. There are several things that can affect the lifetime of the transformer, one of them is the power quality of the supplied electricity from the grid. The power quality in the form of Total Harmonic Distortion Voltage (THDV), Total Harmonic Distortion Current (THDI), voltage sag, flicker, current, and power must be maintained in required limit or standard range so that it keeps the step down transformer in the best performance and also longer lifetime. In order to know the performance and lifetime of the transformer, there are two important tests that need to carry out periodically which are Dissolved Gas Analysis (DGA) and Break Down Voltage (BDV) test. These tests examine the dissolved gas content and dielectric strength in the transformer oil. The work in this thesis is to carry out a study of power quality effect on a transformer lifetime. The supplied power quality of the PLN grid in the outgoing of step down transformer was measured by using HIOKI PW319 power analyser. Experiment and analysis in this thesis concluded that there is a strong correlation between the supplied power quality of PLN grid and the performance and lifetime of the examined transformers. Poor power quality causes the running lifetime and the performance of the examined transformers decreases.

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