Medium Frequency Induction Melting Furnace as a Load on the Power System

Date

2011-10-13

Author

Yilmaz, Ilker
Ermiş, Muammer

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

53
views

0
downloads

The variable frequency operation of the coreless induction melting furnace has been investigated in detail both theoretically and experimentally. The time variations of the operational impedance value of the induction melting furnace, owing to the time-varying resonance frequency and crucible conditions, have been derived for typical melting cycles by using a variable, parallel RLC model derived from extensive field measurements. The work coil and its crucible is supplied at variable frequency from a multi-pulse rectifier and a current-fed, load resonant inverter cascade. Uncharacteristic current harmonics caused by cross modulation phenomenon across the AC-DC-AC link have been derived theoretically, and verified by field tests. These theoretical results and extensive field measurements on a sample induction melting furnace installation have shown that i. the major power quality problem of an induction melting furnace as a load on the power system, is the injection of various characteristic and uncharacteristic current harmonics to the grid, ii. line currents on the supply side are nearly balanced, iii. flicker contribution is below the limits specified in the standards, iv. reactive power demand is relatively low and the variations in the magnitude and rate of change of active power are not drastic, and v. no voltage sag and swell phenomena arising from furnace operation occur.

URI

https://hdl.handle.net/11511/53519

Collections

Graduate School of Natural and Applied Sciences, Conference / Seminar

Suggestions

OpenMETU
Core

Medium-Frequency Induction Melting Furnace as a Load on the Power System Yilmaz, Ilker; Ermiş, Muammer; Cadirci, Isik (2012-07-01) The variable-frequency operation of the coreless induction melting furnace (IMF) has been investigated in detail both theoretically and experimentally. The time variations of the operational impedance value of the IMF, owing to the time-varying resonance frequency and crucible conditions, have been derived for typical melting cycles by using a variable parallel RLC model derived from extensive field measurements. The work coil and its crucible are supplied at variable frequency from a multipulse rectifier a...
Low temperature plasma as a means to transform nanoparticle atomic structure Üner, Necip Berker; Thimsen, E. (2018-07-01) Low temperature plasma (LTP) is a highly nonequilibrium substance capable of increasing the specific free energy of mass that flows through it. Despite this attractive feature, there are few examples of the transformation of solid material with an equilibrium atomic structure into a material with a nonequilibrium atomic structure. As a proposed example of such a transformation, in this work, it is argued that the transformation of crystalline metal nanoparticles into amorphous metal nanoparticles is feasibl...
Low voltage integrated charge pump circuits for energy harvesting applications Pathirana, Walive Pathiranage Manula Randhika; Muhtaroğlu, Ali; Sustainable Environment and Energy Systems (2014-7) Two different low voltage integrated charge pump circuit topologies are studied in this thesis for energy harvesting applications. The circuits are implemented in 0.18 μm standard CMOS technology without the use of off-chip magnetic components and non-standard processes, and are thus suitable for low profile (small and low cost) system-on-chip applications. In the first proposed design, operation at low input voltage (~240 mV) is achieved with a 5-stage subthreshold first stage oscillator, which improves th...
Low temperature oxidation of carbon monoxide over alkali-metal promoted palladium-tin oxide catalysts MİRKELAMOĞLU, Burcu; Karakaş, Gürkan (2005-09-17) The CO oxidation activity of sol-gel prepared tin dioxide based palladium and sodium-palladium promoted catalysts were investigated by XRD, XPS, DRIFTS and temperature programmed desorption techniques. XPS data suggests that alkali-metal promotion results in the formation of super-oxide species and promotes the surface segregation of Pd atoms, increasing the number of active sites for CO adsorption/oxidation. The formation of a ternary oxide of sodium and palladium is Postulated. Through sub-ambient TPD exp...
Low temperature thermoluminescence study of some ternary and quaternary layered structured semiconductors Delice, Serdar; Hasanlı, Nızamı; Department of Physics (2016) Thermoluminescence (TL) experiments for ternary and quaternary layered single crystals were carried out in 10−300 K temperature range by employing various heating rates between 0.2 and 1.2 K/s. The TL emissions coming from the trapping centers in the studied samples brought out the TL spectra exhibiting peaks at different temperature regions for each crystals. These peaks were taken under consideration to reveal the TL properties of the associated trap levels. Characterizations of defect centers existing in...

Citation Formats

I. Yilmaz and M. Ermiş, “Medium Frequency Induction Melting Furnace as a Load on the Power System,” 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53519.