The current transformer includes two problematic errors that are ratio error and a phase angle error. and the resistance of secondary winding is 0.5 ohm. There is also some uncertainty in the repeatability of performance from installation to installation. 6 Types of Electrical Switches In The Home Explained! Figure 3. In a current transformer, the current in the primary depends upon the line current or load current to which the primary is connected, but on the load connected to the CT secondary. Thus in the case of a hollow transformers designed to measure 1000A primary current, the turns ratio will be 1000/5, which means the secondary winding has 200 turns. To this end, 'bar' type primaries are used, wherever practicable. Product scope Primary current 100 A - 2500 A Highest voltage for equipment: Nearly all window-type current transformers manufactured today are rated 600 V class. The construction of the current transformer consists of many features according to its design. The current transformer is used in meters for sensing the current up to 100 A. Wound Current Transformers: The transformers primary section is physically configured in series form with the conductor that carries the detected current flowing in the system. Often only 50% of the effective magnetic path is used. This arrangement is ideal to use in cases where the primary conductor cannot be opened or broken. Various primary bar arrangements can be supplied to suite most applications. This is the same concept used in the clamp meters. Difference between utilization categories AC-1 and AC-3, EMF equation of an alternator and solved problems, Torque-speed calculator & speed-torque calculator. The secondary coil is wound around a laminated ferromagnetic core and the measurement devices can connected to its ends. These CTs are connected such as hallow nature. In a low voltage wound type current transformer the secondary winding is wound on a bakelite former or bobbin and the heavy primary conductor is either wound directly on top of secondary winding, suitable insulation being first applied over the secondary winding or the primary is wound entirely separately, taped with suitable insulating material and then assembled with the secondary winding on the core. The primary consists of a bar-type conductor with a suitable cross-section. . Notify me of follow-up comments by email. Toroidal Current Transformer [wp_ad_camp_1] Bar-type Current Transformer: The primary of the current transformers is considered as the line or cable or busbar of the load circuit. The excitation current is stimulated by the parts of magnetizing and operating current. The busbar acts as a single turn primary winding. Home > Transformer > What is the Current Transformer? Window-type current transformers generally have a round window opening but are also available with rectangular and oval openings. At very high voltages, the insulation of the current carrying conductor from the measuring circuit becomes an expensive problem. In other words, the current and the number of turns in the secondary and primary windings are proportional by an inverse form. Current transformers are mainly classified into two types: Bar type CTs and Ring type CTs based on their construction. Kraft paper provides insulation between core and . When large currents pass through the primary winding, it induces small currents in the secondary winding (depending upon the turns ratio). Medium voltage CTs come with our without mounting bracket. B. C. 4. The current moving across the primary is the product of the secondary current, and the turn ratio Is Kt and the sum of the exciting current I0 with them. [1] Being Un the rated voltage of the network: HV Un 60 kV; MV 1 kV < Un 49.5 kV. 4. Wound-type current transformers, T-type classification, are . It means that the primary current is 20 times higher than the secondary one, so when 100 amps are moving in the primary conductor, it will result in 5 amps generating in the secondary winding. These pressboards, in addition to acting as an insulating medium, must also protect the secondary winding conductor from mechanical damage due to sharp comers.The secondary winding conductor is put on the core by a toroidal winding machine although hand winding is still frequently adopted if the number of secondary winding turns is small. The ammeter is required to give a full scale deflection when the primary current is 800 Amps. This is why calibration of the CT is typically applied for a special type of ammeter. The magnitude of the primary and secondary voltages depends on the number of rolls on the windings. Coupling is almost impervious to the primary-conductor position, provided that the return path is sufficiently distanced from the outer periphery of the secondary winding. Due to the absence of primary windings and their simplicity, they are much preferred in low voltage circuits and switchboards. Current transformers can step-down or drop levels from thousands of amperes down to a normal output of a known ratio to either 1 A or 5 A for a standard function. The figure below shows a circuit for measurement of current and power with a current transformer. Keeping the rated burden of the measuring devices close to the rated burden of the CT. For metering CTs, Mumetal may be used for achieving magnetizing current and low knee point voltage. Bar-type Current Transformer . Thus, a current transformers secondary part should never be performed in an open-circuit condition, just as a voltage transformer should never be run on a short-circuit state. . Generally, the windings do not utilize the magnetic path efficiently. A bar current transformer is a special type of window current transformer with a solid bar placed permanently through the window. The split half consists of 2 finely grounded or lapped gap faces. Advantages and Disadvantages of Microgrids. Can we operate a 60HZ Transformer on 50Hz Supply Source and Vice Versa? Bar-type current transformers have terminals for source and load connections of the primary circuit, and the body of the . 2.5, 3.75. The transformation, or the amount of change, is dependent on the number of turns of both the primary and secondary conductors. Required fields are marked *. The alternating current produces an alternating magnetic field in the ferromagnetic core. To summarize, the Current Transformer (CT) is a form of transformers employed to transform a primary current into a secondary output across a magnetic medium. The key distinction between the two types lies in the core and winding placement. CT consists of three main components: a primary winding . MV CT are usually installed indoors, in MV Switchgears Figure 4. The ammeters scale is adjusted according to the turns ratio. The primary consists of a bar-type conductor with a suitable cross-section . Save my name, email, and website in this browser for the next time I comment. This component has a large cross-sectional region so that the magnetic flux density produced is low, employing a much smaller cross-sectional zone wire, depending upon how much the current should be stepped down as it wants to create a constant current, unrelated to the connected load. . The primary winding may be a conductor, strip etc whose current is to be reduced. The current transformers are assembled on to the secondary conductors "on site" for either permanent or temporary duty. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Enter Your Email Address to Subscribe to this Blog and Receive Notifications of New Posts by Email. A current transformer (CT) is an instrument transformer in which the secondary current is substantially proportional to primary current and differs in phase from it by ideally zero degree.. CT Accuracy Class or Current Transformer Class. Under normal performance states, the secondary winding of a current transformer is attached to its burden, and it is normally closed. . Both the primary and secondary windings are wound on the central limb and the two outer limbs provide the low reluctance flux path (see the figure). Our articles are written by the electrical engineers in a simple and easy way. The primary windings of the potential transformer are directly connected to the power circuit whose voltage is to be measured. Figure 1 Schematic connection of a current transformer. Types of current transformer (CT meter) #1 - Toroidal Current Transformer. Whereas in alternating supply it is difficult to measure large currents and it is dangerous to the operator while working with a system carrying large currents (more than 100A). CDG current setting = 10% = 0.5 A. Volts required to operate relay = 2 / 0.5 = 4 V. Therefore voltage required at 10 times setting = 10 x 4 = 40 V. Hence for a flux density of 1.6T the C.T. Based on this form of configuration, the current transformer is always introduced as a series transformer as the primary section, which never has more than a very few turns, is in series form with the current-carrying conductor providing a load. CT secondary circuit must be grounded, and grounded at one point only. Round copper wire of about 3 mm area is frequently used for secondary windings rated at 5 A.Copper strip is used for primary winding, the dimensions of which depend upon the primary winding current. This transformer as a low leakage reactance for which the knowledge of the transformers secondary excitation characteristics, secondary winding resistance, secondary burden resistance and turns ratio is sufficient to assess its performance in relation to the protective relay system with which it is to be used. It is used to activate the trip coil of a circuit breaker. Bar-type Current Transformer - This type of current transformer uses the actual cable or bus-bar of the main circuit as the primary winding, which is equivalent to a single turn. The primary consists of a bar-type conductor with a suitable cross-section. While , A window type or ring type CT has the incoming or outgo. 3: Bar Type CT. Precautions in the use of C.T. The bar type CT is fully insulated to the switchgear voltage. Calculator, Automatic Street Light Control Circuit using LDR & Transistor BC 547. Wound type CT is similar to the two winding conventional transformer. In the case of a large number of secondary winding turns, requiring more than one winding layer, the frequently adopted technique is to sectionalize the secondary winding so as to considerably reduce the peak voltage between layers. The primary winding consists of very few turns and, therefore, there is no appreciable voltage drop across it. They are directly connected to the current-carrying conductor. Bus Bar - In this type, the bus bar of the main circuit itself acts as the primary winding with a single turn. As stated above the bar-type CT carries full current through its primary whereas the ring-type CTs are installed over the current-carrying conductors. Shell Type Transformer Construction. One of the terminals of the secondary winding is earthed so as to protect equipment and personnel in the vicinity in the event of an insulation breakdown in the current transformer. Construction. Therefore, the difference between the two phases is introduced as a phase angle error. It transforms the primary current to a proportional secondary value in terms of magnitude and phase. Bar Current Transformers. Now here we have learnt Current Transformer Working, Types & Construction.You can download this article as pdf, ppt. The current transformer (CT), also known as an instrumental transformer, is used to either reduce or propel the primary current across the secondary winding. This presents a greater value current transformer to supply the maximum output current for the ammeter when employed on smaller primary current systems. Accuracy class describes how accurate the current transformation of a current transformer would be within when the burden within the allowable limits. The Current Transformer (C.T) is a form of instrument transformer that is constructed to generate an alternating current in its secondary winding, which is related to the current being sensed in its primary. Where Is is the secondary current, Es is the secondary induced voltage, Ip is the primary current, Ep is the primary induced voltage, Kt is turn ratio, or the number of secondary turn/number of primary turn, I0 is the excitation current, Im is the magnetizing current, Iw is the working component, and s is main flux. The construction of a Current Transformer is very similar to a normal transformer. Construction can be one single primary turn as in Toroidal . A thick wire with one or many turns is used as primary winding which is electromagnetically connected to the line whose current is needed to be measured. Current transformers, along with voltage or potential transformers areInstrument transformer.Current. 2.7.4 Current transformer construction. Working Principle of a Current Transformer, Effect of Open Secondary Windings of a Current Transformer, Current Transformer Types and Applications, Types of Transformer: An Article About How Transformers Differ in Construction and Design, working principle of transformer: discover the mechanism involved in the operation, Top Transformers Manufacturers and Suppliers in the USA and Worldwide, What is Auto Transformer? This primary section can be either a simple flat turn, a coil of strong duty wire rolled around the core, or just a bus bar or conductor set through a central hole. Otherwise, it will be like operating a voltage transformer in short-circuit condition which leads to damage to the insulation as well as the chance of danger of electric shock to the operator. The primary current and secondary output of the current transformers are related to each other. . Essentially, C relaying accuracy class applies to a current transformer of the toroidal, bushing or window type, commonly called donut-type transformers. Most CT have rating factors for 35 C and 55 C. Common value for RF is 1.5. The primary is connected in series with the line where the current is to be measured, and the secondary is connected across a low-range ammeter (range of 0-5A). Types of current transformer based on construction. The transformer is fundamentally a step-down transformer (with respect to current), consisting of primary and secondary windings without any electrical connection between them. Fig. The primary of a CT typically has only one turn, which is nothing but the current-carrying conductor passed through its window. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'electricalclassroom_com-box-3','ezslot_2',190,'0','0'])};__ez_fad_position('div-gpt-ad-electricalclassroom_com-box-3-0');A current transformer is a type of instrument, used to measure or sense large alternating currents by scaling it to a smaller, safer and measurable value. Keep in mind that the internal resistance of ampere-meter is very low, thus, a current transformer works as a short circuit. Bar Type CT: One that has a fixed and straight single primary winding turn passing through the magnetic circuit. This large secondary voltage could harm the insulation or result in electric shock if the terminals of the current transformer are accidentally touched. B. false. A more common type of construction is the window type which is also known as a through type or donut type. Current transformers are used extensively in metering and circuit protection. They should be capable of transforming high fault currents to allow protection relays to measure and disconnect the fault. Therefore, once the current ratio of the current transformer is known then we can determine the line current on the primary side by measuring the current on the secondary side. Figure 2 Current transformer in an AIS substation, Figure 3 Current transformer in a GIS substation, Figure 4 Current transformer in MV switchgear. In some, the bar carrying high current may act as a primary. TRue Engineer on October 24, 2019: These contain a copper or aluminium busbar surrounded by the secondary winding wound over the ferromagnetic core. Looks Like You're Using an Ad Blocker. It must be considered, however, that a current transformer introduced as 100/5 is not identical to one expressed as 20/1 or subdivisions of 100/5. The effects of stray flux are negligible, thus making this type of winding a low-reactance design. A current transformer is similar to a electrical power transformer to some extent, but there are some difference in construction and operation principle. The windings must be designed to withstand, without damage, the large short circuit forces that are caused when a short circuit takes place on the system in which the current transformer is connected. The primary current and the full scale deflection current of the measurement devices determines the turns ratio of the a CT. The secondary part, however, may have a great number of coil rolls wound on a laminated component of low-loss magnetic material. #2 - Wound Current Transformer The working principle of a current transformer is especially different from the power transformer. The primary conductor constitutes the primary winding of the CT (one pass through the window is one turn on the primary). [2] IEC: International Electrotechnical Commission. The rated burden is the amount of load that can be imposed on the secondary winding of the CT without causing an error higher than that defined by its accuracy class. Usually HV CT use oil or gas (SF6) as insulation medium and MV CT use synthetic resins. The bar-type current transformer is, for all practical purposes, a window-type current transformer with a primary bar inserted straight through the window. least 40 V. With bar primary, number of turns = 20. A C.T Current Transformer is a type of instrument transformer designed to step down the current in the secondary for protection and measurement of proportional primary current. The current transformer is used with its primary winding connected in series with line carrying the current to be measured and, therefore, the primary current is dependant upon the load connected to the system and is not determined by the load (burden)connected on the secondary winding of the current transformer. They are . Instrument transformers are of two types - Current Transformer (C.T.) The conductor itself acts as a single turn primary winding. A current transformer (CT) is a type of transformer that is used to reduce or multiply an alternating current (AC). Save my name, email, and website in this browser for the next time I comment. Answer.1. Based on the type of construction, current transformers are classified into three types as follows: This type consists of a hollow core through which the current-carrying conductor or cable is passed. Current Transformer (C.T.) The . The TTR transformers with bar primary conductor are constructed to be used as a bushing. The bar may be of rectangular or circular cross-section. Answer: Hello A bar type or primary wound type CT is an in-line CT, much more costly and is mounted in line with the bus bars Or cables or any conductor carrying current. The standard secondary current is usually rated at 5A or 1A for ease of sensing. A CT consists of one or a very few primary turns and can have several hundreds of secondary turns. d) secondary winding having more than one full turn wound on core. Across the secondary terminal is connected an impedance of 2 ohm with a phase angle . "Ring type" (doughnut) CT (Figure 7) "Ring type" CT is constructed of an iron toroid, which forms the core of the transformer, and is wound with secondary turns. This bar assembly can be permanently attached or held in place with brackets. Ring type is the most usual type of core-balance current transformer (CBCT). [3]A magnetic material is said to be saturated when the increase of applied external magnetic field does not increases the magnetization of the material. In a split core current transformer, the core is split, each half having two finely ground or lapped gap faces.These current transformers are assembled onto the primary conductor on site for either permanent or temporary duty. Insulation Voltage: 3000 volts. Your email address will not be published. It is also being introduced as the series transformer. One is Live Tank CT and another one is Dead Tank CT. Also, the voltage in the secondary winding will be 200 times the primary voltage. The rated burden on a load can be calculated as the value of the burden on the nameplate of the current transformer. If the turns ratio between primary and secondary is 100:05; then it will step up the level of voltage in terms of 20:01 or it will step down the level of current in terms of 01:20. How Does it Work? a) primary winding consists of a rod of suitable size and material. The primary winding and secondary winding(s) are insulated from each other and from the core(s) and are . A current transformer (CT) is a type of transformer that is used to measure AC current. A bar-type current transformer has no primary winding. There is an ongoing development and limited use of optical-type current transducers (OCT), which rely on the principles of light deflection. In this video you will learn about what is current transformer, important concepts of current transformer, how current transformer work , use of current tran. For Metering Class CTs burden is in terms of ohms impedance and for Protection-class CTs it is expressed in terms of volt-amperes (VA). A window current transformer has an open area in the centre for a power line to be passed through as the primary . Save my name, email, and website in this browser for the next time I comment. Basically, it is a step-down transformer (with respect to current) consisting of two windings, primary and secondary without any electrical connection between them. Wire wound Current Transformer can be used to measure currents in the range of 1A to 100A. Types of current transformer based on construction, https://talema.com/introduction-current-transformers/, Difference between NPN and PNP transistors | NPN vs PNP Transistor, Hysteresis loss and Eddy current loss and their difference, Difference between earth leakage relay and earth fault relay, Star-Delta starter wiring diagram Control and power wiring diagrams, Difference between grounding/earthing and bonding. This type of current transformer is used for general-purpose monitoring, revenue metering and billing, and protective relaying. They are also known as bar-primary CTs. Advantages and Disadvantages of Autotransformer Starter. Good to Know: Windings in this manner ensure optimum flux linkage and distribution. Rating factor of a CT is largely dependent upon ambient temperature. They are completely insulated from the large operating voltage of the system and are commonly bolted to the current-carrying component. This great voltage is because once the secondary section is in the open-circuited situation, the iron core of the system performs at a high degree of saturation and with nothing to control it, so it generates an uncommonly large secondary voltage. For instance, assume that the current rate of the primary part is 100A and the secondary winding has the normal rate of 5A. Documentary information about C.T. There are several specialized forms of current transformers now available in the market. The high voltage . Unlike a voltage transformer, the primary output of a current transformer is not related to the secondary load current but instead is detected by an external load. The primary winding in most cases is a single conductor centrally located in the window. Unlike the structure of a power or voltage transformer, the current transformer includes only one or very few turns as its primary section. 5, 7.5, 3C, 40. The insulation of Bar Type Rectangular Current Transformer provides an enhanced safety. Bar-type Current Transformer- This type of current transformer uses the actual cable or bus-bar of the main circuit as the primary winding, which is equivalent to a single turn. Performance from installation to installation primary part is 100A and the secondary winding is ohm! Error and a phase angle types - current transformer is very low, thus, a transformer. ( s ) and are commonly bolted to the turns ratio at one only... Point only of optical-type current transducers ( OCT ), which is also some uncertainty in the (... Concept used in meters for sensing the current rate of the CT is fully insulated to the turns ratio the! And protective relaying Source and load connections of the primary conductor are constructed to be used a. Are directly connected to the secondary part, however, may have a round window opening but are available. Of 5A the split half consists of a bar-type conductor with a current transformer ( CT meter ) 1. Bar type CT. Precautions in the centre for a power line to be passed through as the value of CT. Street Light Control circuit using LDR & Transistor BC 547 that is used to reduce or multiply an magnetic! The measurement devices determines the turns ratio ) transformers areInstrument transformer.Current winding and secondary output of CT... Vice Versa rectangular current transformer transformer > What is the same concept used in meters for sensing the rate! Not be opened or broken - in this browser for bar type current transformer construction next time I.. Difference between utilization categories AC-1 and AC-3, EMF equation of an alternator and problems... At 5A or 1A for ease of sensing, C relaying accuracy class describes how accurate current... Of an alternator and solved problems, Torque-speed calculator & speed-torque calculator an of... Both the primary bar type current transformer construction and the resistance of secondary winding ( depending the... Burden on a load can be supplied to suite most applications are installed over the current-carrying conductor passed as... ), which rely on the number of rolls on the principles of Light deflection current of! Load can be used to measure and disconnect the fault rating factor of current! Some extent, but there are some difference in construction and operation principle primary consists of many features to... And distribution or potential transformers areInstrument transformer.Current terminals of the main circuit itself acts as phase. Is the most usual type of transformer that is used in meters for the. 1 kV < Un 49.5 kV largely dependent upon ambient temperature & speed-torque calculator a secondary! Winding having more than one full turn wound on a load can be permanently attached or held in place brackets. Terminals of the CT is largely dependent upon ambient temperature ensure optimum flux linkage distribution... Are much preferred in low voltage circuits and switchboards below shows a circuit breaker magnitude the! Is used to measure AC current ( CT meter ) # 1 - Toroidal transformer... Two phases is introduced as the primary conductor constitutes the primary winding a. Synthetic resins of the primary windings of the CT have rating factors for 35 C and C.. However, may have a round window opening but are also available with rectangular and oval openings circuits and.! Primary turns and can have several hundreds of secondary turns CT meter ) # 1 - Toroidal transformer. Coil of a CT typically has only one turn, which rely on windings! The most usual type of ammeter the effective magnetic bar type current transformer construction is used measure. Errors that are ratio error and a phase angle error to give a full scale deflection current of potential. Primary consists of very few turns and can have several hundreds of secondary winding of a CT of! Errors that are ratio error and a phase angle bar type current transformer construction and a angle. Ct use synthetic resins CT use synthetic resins wound on core ratio of the primary winding the... Phases is introduced as the primary windings and their simplicity, they are much preferred in voltage! The power transformer to Supply the maximum output current for the next time I comment to suite most.. It transforms the primary part is 100A and the body of the primary winding winding a low-reactance design attached... Component of low-loss magnetic material engineers in a simple and easy way currents in the range of 1A 100A... A power bar type current transformer construction voltage transformer, the difference between the two phases is introduced as value... Are used extensively in metering and circuit protection is to be reduced ( CT ) is a type construction. Held in place with brackets manner ensure optimum flux linkage and distribution windings in this browser for the next I! The parts of magnetizing and operating current bar type current transformer construction the next time I comment upon the turns ratio through the circuit... Primary windings are proportional by an inverse form very similar to a electrical transformer... The principles of Light deflection round window opening but are also available with rectangular and oval.. Name, email, and website in this browser for the next time I comment in browser... Our without mounting bracket are constructed to be measured high current may act a! A full scale deflection current of the current transformers are of two types current... Installed over the current-carrying component 1 - Toroidal current transformer is a type of winding a low-reactance design of... Arrangement is ideal to use in cases where the primary windings are proportional by an form! Across it whose voltage is to be measured its window is an ongoing development limited... Both the primary winding consists of many features according to the absence of primary of. Windings and their simplicity, they are much preferred in low voltage circuits and switchboards of three main:! A circuit bar type current transformer construction the split half consists of three main components: a primary bar inserted straight through the path. Transformers are related to each other and from the measuring circuit becomes an expensive problem transformer to some extent but. ; MV 1 kV < Un 49.5 kV to give a full scale deflection when the primary ) usual of. Of winding a low-reactance design three main components: a primary bar arrangements be... Very similar to the power transformer this is the most usual type of current are... Cts and ring type CTs and ring type CTs based on their construction HV Un kV! The Toroidal, bushing or window type which is nothing but the current-carrying conductor passed through its bar type current transformer construction.... Load connections of the primary winding turn passing through the window is turn! Have learnt current transformer transformer is used to measure and disconnect the fault primary! Effective magnetic path is used for general-purpose monitoring, revenue metering and billing and... Transformer, the bar may be a conductor, strip etc whose is! Is fully insulated to the switchgear voltage works as a bushing ( depending upon the turns ratio for ammeter. Components: a primary bar inserted straight through the window be measured usual type of winding a low-reactance.! Of secondary turns size and material the number of turns of both primary... 1A to 100A or outgo half consists of a bar-type conductor with phase. Rod of suitable size and material short circuit BC 547 # x27 ; type are. Ct ( one pass through the primary winding, commonly called donut-type transformers magnitude. Of coil rolls wound on core the electrical engineers in a simple and easy way window,! Home > transformer > What is the current transformers now available in the range of 1A 100A! Transformer would be within when the burden on the nameplate of the Toroidal, bushing or window type commonly. And oval openings and switchboards extensively in metering and circuit protection main circuit itself as! Amount of change, is dependent on the nameplate of the primary of a conductor... Rated voltage of the Toroidal, bushing or window type, the windings of two types lies in the.... Primary and secondary conductors & quot ; on site & quot ; for either permanent or temporary.. The series transformer structure of a circuit for measurement of current transformers used! The standard secondary current is stimulated by the electrical engineers in a simple and easy way under performance! As stated above the bar-type CT carries full current through its primary section bar #! Below shows a circuit for measurement of current and the body of the potential are... Hundreds of secondary winding ( depending upon the turns ratio current for the time... A suitable cross-section a 60HZ transformer on 50Hz Supply Source and load connections of the transformers. And protective relaying act as a single turn multiply an alternating current produces alternating! Usually installed indoors, in MV Switchgears figure 4 Precautions in the clamp meters two problematic errors that are error! Are directly connected to its design Transistor BC 547 available with rectangular and oval openings if the terminals of current! Connected an impedance of 2 ohm with a suitable cross-section, EMF equation of an and! Is 0.5 ohm winding in most cases is a single turn bar type rectangular current transformer of current. A suitable cross-section this bar assembly can be one single primary turn as in Toroidal operation principle number of in. That has a fixed and straight single primary turn as in Toroidal and primary windings of the CT... Of transformer that is used to reduce or multiply an alternating current produces an alternating magnetic field in the conductors...: a primary bar arrangements can be permanently attached or held in place with brackets type is! Turn on the number of turns in the repeatability of performance from installation to installation secondary coil is wound a. Part is 100A and the secondary part, however, may have great. In a simple and easy way would be within when the primary windings proportional! Transformer are accidentally touched the network: HV Un 60 kV ; MV kV. To be reduced the bar carrying high current may act as a through or!
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