The valve reactor is an important part of the dc converter valve. Resonant power conversion through a saturable reactor. A simulation model for the saturable reactor, an electromagnetic devices widely used as a protective element for the thyristor circuit, is presented. Saturable reactor article about saturable reactor by the. The ac reactor features a magnetic core that can be deliberately saturated by means of a direct electric current in a control winding. L1 is the schematic symbol for a saturablecore reactor. Making a bladeless wooden fan scrapwood challenge ep38 duration. One phase of a threephase transformer is connected on a 500 kv, 5000 mva network.
The reactors power winding is the one carrying the ac load current, and the control winding is one carrying a dc current strong enough to drive the core into. It makes up a thyristor module by connecting multiple thyristors in series, and two thyristor modules constitute a valve module. Magnetic amplifier technology involves unique techniques that can be tailored to match the fit, form, and function of your application. Saturable reactor hysteresis model based on jilesatherton. Saturable reactors are used in systems when a drop in full line voltage with complete linearity, a need to limit voltage spikes, sags and harmonics is required. Magnetic amplifiers for voltage regulation applications.
The permeability of the core is changed by varying a unidirectional flux flux in one direction through the core. This is helpful for driving a variety of loads including motors, furnaces, and even lighting equipment. Earlier in this article we studied that it is designed based on the design of the saturable reactor, which consists of major parts such as dc source, magnetic core with windings and ac source. Saturable reactors are considered magnetic amplifiers because they can use a relatively small amount of dc voltamps to control the transfer of a significant amount of ac.
Saturable reactors are magnetic amplifiers saturable reactors are not common electromagnetic components. Pdf a simulation model for the saturable reactor, an electromagnetic. Saturable reactor works on the principle by varying the saturation of the core the current flow through a coil wound on a magnetic core can be varied. Magneticamplifier analysis using a generalized model for the saturable reactor core by herbert horace woodson submitted to the department of electrical engineering on may 14, 1956, in partial fulfillment of the requirements for the degree of doctor of science. The dc current control in case of smelting plant typically constitutes of saturable reactors for continuous control and on load tap changer oltc of the group. The invention provides an electrical design method of a saturable reactor for a direct current converter valve, in particular to an electrical design method of a saturable reactor with a simple winding structure, thereby filling the blank of the filed in our country. Saturable core reactors an overview sciencedirect topics. As it is usually connected in series to the anode of the thyristor, it is also referred to as an anode reactor. The cores are high permeability, so they saturate pretty easily. Saturable reactor, temporary overvoltage, hvdc link, thyristor controlled reactor tcr, pscademtdc.
Figure 332 shows a saturable core reactor that is used to control the. Design, test and demonstration of saturable reactor high. The control winding is shown with five loops, and the load winding is shown with three loops. A saturable reactor capitalizes on this effect by forcing the core into a state of saturation with a strong magnetic field generated by current through another winding. A saturable reactor transformer supplies an input to the control terminals of the switching elements of the oscillating drive circuit and the inductance of the saturable reactor transformer is controlled with the output voltage from the secondary of the power source transformer so as to control the oscillating frequency of the oscillating drive. Saturable reactors that are used for controlling variable outputs are provided, in their simplest form, with a dc winding that furnishes the premagnetization and with an ac winding between an ac source and a load to which the current is controlled by varying the amount of premagnetization. It makes up a thyristor module by connecting multiple thyristors in series, and. Saturable reactor 115v, 400hz navy shipboard espey mfg.
An ironcore reactor having an additional control winding that carries direct current whose value is adjusted to change the degree of saturation of the core, thereby changing the reactance that the alternatingcurrent winding offers to the flow of alternating current. The schematic diagram of this circuit is shown in figure 333. Also known as magnetic amplifiers, saturable reactors use a dc control winding to control the flow of ac power in a circuit. Oct 31, 2011 zenergy power has successfully designed, built, tested, and installed in the us electrical grid a saturable reactor fault current limiter. Details on a saturable reactor that can be quickly assembled using two standard power transformers. The active control circuitry connected to it was even more baffling to me so i had to figure out what was going on in the circuit. Saturable reactor model a saturable reactor is a magnetic circuit element consisting of. The model has been simulated using an improved version of spice, which also contains the model of. Saturable reactor definition is an ac reactor coil of variable but limited impedance because of magnetic core saturation by means of an auxiliary dc excitation coil abbreviation sr. Saturable reactor definition of saturable reactor by. Assessment of saturable reactor replacement options ipst.
The pdfreactor software license agreement can be found here. Saturable reactors are used in systems when a drop in full line voltage with complete linearity. A saturable reactor in electrical engineering is a special form of inductor where the magnetic. Self isolating high frequency saturable reactor sematech, inc. Singlecore saturable reactor with premagnetization.
Osborne has been involved in a wide variety of saturable reactor design projects over the years. Saturable reactor for power flow control in electric transmission. Magnetic amplifier mag amp saturable reactor wireless power transfer. A saturable reactor for power flow control srpfc is a novel application of a concept well known to electronics and power electronics engineers that provides continuous modulation of line reactance by controlling the magnetization in a ferromagnetic core. Therefore, a saturable core macro model, utilizing the isspice subcircuit feature, must be created. It looks like a regular transformer power supply except that theres an extra inductive element called a saturable reactor drawn in one of the power connections. The transformer is rated 500 kv230 kv, 450 mva 150 mva per phase. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on reactors. Cn101714450a electrical design method of saturable reactor. The main electrical performance indexes of the saturable reactor are provided, the contents of the electrical design mainly. L1 is the schematic symbol for a saturable core reactor. The saturable core model is capable of simulating nonlinear transformer behavior including saturation, hysteresis, and eddy current losses. Abstract a mathematical representation for a polycrystalline. Figure 2 basic saturable reactor and magnetic amplifier control circuits.
Cn101714450a electrical design method of saturable. A saturable reactor for reducing reverse recovery current at turn off and limiting didt at turn on in a semiconductor switching device, the. This decreases inductive reactance and allows increased flow of the alternating current ac. Us 4152637 a saturable reactor limiter for current the. Saturable core reactor a saturable core reactor is a magneticcore reactor coil whose reactance is controlled by changing the permeability of the core. A major application field of the saturable reactor is power. A saturable reactor device for limiting alternating and direct current in an external electric circuit. May 09, 2010 desperately needing a random electronic release this weekend, i wound a quick saturable reactor.
Pdf a simulation model for the saturable reactor researchgate. The operating principles of saturable reactors have been known for quite a long time, but it is only within the past few years that these units have come into general use. Main applications sample problems saturable reactor. Once saturated, the inductance of the saturable reactor drops dramatically. A saturable reactor in electrical engineering is a special form of inductor where the magnetic core can be deliberately saturated by a direct electric current in a control winding. Here is a brief overview of why saturable reactors are occasionally referred to as magnetic amplifiers. Beginning in 2007, first as sc power systems and from 2008 as zenergy power, inc. The double bar between the inductors stands for an iron core, and the symbol that cuts across the two windings is a. The reactance of the saturable reactance can be varied steplessly by changing the control winding current. The theory of magnetic amplifiers is dated, but its simplistic design has benefits for modern applications.
Pdf a simulation model for the saturable reactor antonio barili. Power magnetics supplies the most reliable saturable reactors available, using our design and manufacturing expertise to meet the demands of industry. Zp ultimately perfected the design of the saturated. Pdf comparison of fault current limitation with saturable. The present invention discloses a saturable reactor and a method for decoupling the interwinding. Saturable reactor for power flow control in electric. Download pdfreactor convert html to pdf, html to pdf.
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