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Current Transformer - Answers.com

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Why secondry of current transformer should not beopen?A current transformer will always attempt to push a ratio of the primary currentthrough the secondary. So if there is primary current flowing, and you open circuit thesecondary, the CT will attempt to build up voltage to the point where the correctamount of secondary current can flow through the open circuit (meaning you will getan arc). If it succeeds, you'll have a bright light, and some melted copper, and a verystartled person who was unfortunate enough to open circuit the CT. This high voltagecan also damage or ruin the CT.

Why current transformer is step down transformer?Current transformers ('CTs') are used in high-voltage systems to allow the currentsflowing in these systems to be measured or to operate protective systems. A CT'ssecondary winding is isolated from the high-voltage system, allowing measurementsto be made, or protective devices to operate, safely. Actually, a CT is a 'step up' transformer, because the terms 'step up' and 'stepdown', refer to voltages, not currents. For this reason, a CT should NEVER beallowed to have its secondary winding open circuited.

What is a current transformer and how can a currenttransformer be used to extend the range of a wattmeter?A current transformer (CT) works just like any other transformer. It is important tonote it is not referenced to ground. It reflects current flow, not phase to groundvoltage, so it attempts to hold current constant, not voltage.

There is usually one primary "winding": one large cable through a donut CT, andmultiple secondary windings. If a secondary winding is shorted (a wire placed acrossits terminals), the voltage built up in the secondary will be equivalent to V = I*Z,where I is the secondary current, and Z is the impedance of the secondary winding,usually specified as some flat value plus so many ohms per winding.

If too big of an impedance is placed on the secondary, a voltage will build up to thepoint that the donut CT saturates, resulting in an output wave that has a largeamount of harmonics. If the CT is open circuit\'d, voltage will build up until it is highenough to arc over (usually where it should have been shorted). CT\'s can bedamaged by open circuiting them, so don\'t do it.

What is the difference between current transformer andneutral current transformer?Current transformer is measured a positive current flow. we used in neutral ct formeasure the unbalance load

What is a current transformer?Current transformers (together with voltage, or potential, transformers) are classifiedas 'instrument transformers'. A current transformer is used to enable conventional

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What are current transformers?In: Transformers

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ammeters to be used to measure the large currents flowing through high-voltage orheavy-current circuits, while electrically isolating (for the purpose of safety) theinstruments from those circuits. Current transformers are also used to provide theinput to high-voltage protection relays which control the operation of circuit breakers.

Can we drive relays by current transformers?Yes, certain types of relays can be activated by current transformers.

What is principle of Current transformer?why does have to short-circuit secondary wire of current transformer ?

What is magneto optic current transformer?Magneto optic current transformer is a protective device. It measure electric currentby means of faradays effect

Why is the neutral current transformer?A current transformer is primarily used at the neutral point of a transformer for earthfault protection.

A neutral current transformer will measure any ground fault current which willessentially flow from the star point of the transformer. A fault-detection device otherdevices is connected to the current transformer and, if the fault current exceeds acertain trigger value, the fault-detection device will give a trip command to an earth-fault relay to disconnect the supply of electricity to the transformer.

Can I connect current transformer in series?The output of a current transformer must be shorted. Otherwise it will not operate incurrent transformer mode and it could potentially generate dangerously high voltages.

Nothing stops you from connecting the inputs of two current transformers in series.They would simply measure the same thing.

When current transformer is overloaded?when your current transformer is over loaded make sure it turns back into a car anddrives away

Working of current transformer?The current transformer is used to measure the line current special transformer. Direct measurement of the current large and small need to range from a few securityuntil tens of thousands of security many ammeter. This gives the instrumentmanufacture a great deal of difficulty. In addition, some lines are high voltage, directelectricity meter to measure the current of the power lines on the road is extremelydangerous. The current transformer is used to solve these two problems ofequipment.

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The current transformer has two windings insulated from each other, set in a closedcore column. At runtime, the primary winding and the measured line in series, theprimary and secondary windings connected measuring instruments (eg, ammeter,power meter and power meter current coil, the low impedance of the relay coil, etc.).Therefore. Measuring the current of the power lines on the road, despite thetransformer primary voltage is high, then face transformer secondary voltage is verylow, the operator and instrumentation are safe.

What is a c200 current transformer?This is a class of current transformers, and is a fairly low class. This has to do withwhat kind of burden can be placed on the secondary. A general rule is a C200current transformer can supply ~200 volts at full ratio to its' secondary. If the burden(the CT resistance + cable resistance + relay or instrument resistance) times themaximum expected current is higher than 200 volts, the CT is likely to saturate.

During multiple fault events, a CT may keep some magnetizing current causing CTsaturation to be higher on a reclose event. Typically CT's are sized and their ratiosare chosen to minimize saturation when feasible.

How current transformer measure current?A current transformer doesn't 'measure current'. It merely reduces a large currentflowing through its primary to a smaller current which can be read by an ammeterconnected to its secondary. At the same time, it electrically isolates the secondarycircuit from the primary circuit, which is essential if the primary circuit is part of ahigh-voltage system.

What are the bushing in the current transformer?A 'bushing' is a hollow insulator. It allows an energised conductor to pass throughcomponents operating at different potentials. In the case of a current transformer, itprovides the insulation between a 'bar' primary and the secondary windings.

When would you use current transformer?A 'current transformer' (CT) is classified as an instrument transformer, which means itis used to provide a small secondary current that is in proportion to its large primarycurrent, for purposes of metering or protection. At the same time, it electrically-isolates the secondary (metering) circuits from the primary circuits (which are oftenhigh-voltage circuits) for the purpose of safety.

What are the functions of current transformer?Measurements of electric currents Answer

A current transformer allows high values of a.c. current to be measured using anammeter designed to measure lower-values of a.c. current. At the same time, itelectrically isolates the primary circuit from the secondary circuit -essential if theprimary circuit is part of a high-voltage system. CTs are also used to monitor primarycurrents for the operation of high-voltage protection relays.

How do you multiply current transformer output?There are many ways but never can you multiply the power.



A current transformer is specifically designed, by amp turns, to only output 5 amps.Meters that are connected to CT's have a full range deflection (scale) of 5 amps. Todo what you are asking seems pointless as there are no meters with 10 amp fullscale deflection.

What happen if current transformer is shorted?A current transformer (or CT) is constructed in a specific way so as to step down thecurrent in a high power circuit for measuring or protective relaying purposes.Typically, it will have a toroidal-shaped iron core with the secondary windingswrapped around it. the primary "winding" is usually the conductor of the main powersystem passing directly through the hole in the center of the CT. As a result of thisconstruction, if the secondary windings are left open, a very large flux can develop,resulting in damage to the CT and possibly even the other equipment it is attachedto. As such, if the CT is not going to be used, its secondary windings need to beshorted.

What is TPS class current transformer?TPS Class CT is used for transient performance (TP). TPS class Current Transformerhas Low Leakage Flux and there is no limit for remanent flux) further there are alsoTPX,TPY and TPZ class CTs 1. TPX- No Limit for remanent flux due to nil air gap in the core2. TPY - remanent flux does not exceeded 10 % due to less air gap in the core3. TPZ- Having practically null remanent flux because there is large air gap is providein the Core

Er. Anil Prajapati, Protection Engineer,Jaipur RVPNL

How does a current transformer work?A current transformer (CT) works just like any other transformer. It is important tonote it is not referenced to ground. It reflects current flow, not phase to groundvoltage, so it attempts to hold current constant, not voltage.

There is usually one primary "winding": one large cable through a donut CT, andmultiple secondary windings. If a secondary winding is shorted (a wire placed acrossits terminals), the voltage built up in the secondary will be equivalent to V = I*Z,where I is the secondary current, and Z is the impedance of the secondary winding,usually specified as some flat value plus so many ohms per winding.

What are the application of current transformers?Current transformers are used to monitor the current flow through larger diameterwires. They are rated in ratio of 1: to the ampacity of the wire they are monitoring.They are used in electrical distribution services over 200 amps. Maximum currentproduced is 5 amps. eg. A conductor has a maximum capacity of 500A and you wantto see how much current is going through the wire at any one time. You have ameter mounted in a control panel with main graduations of 100A, 200A, 300A, 400Aand 500A. The same hold true on a distribution service where the CT is connected tothe meter base. The specs on the meter says full scale deflection 5 amps. The CT ismounted on the conductor like a do-nut and has a ratio of 1:500. 500A through theconductors induces 5 amps in the CT, full scale deflection of the meter to the 500Aposition. The current through the CT is in direct porportion to the current through theconductor. 250A through the conductor, induces 2.5 amps in the CT, half deflection ofthe meter to a position halfway between 200A and 300A, or 250A.

Explain differancnce between instrument currenttransformer and measuring current transformer?



Instrument current transformer is used to adjust the output voltage from power sourceto be conveniently used by instrument.Measuring current transformer is used to measure AC currents.

What are the functions of current transformers and thedifference between current transformers and voltagetransformers?To sense the current flow across the current transformers and to monitor the currentratings. In current transformers no voltage variations occurs. but in voltage transformers it ismainly used to increase or decrease the voltage value.

Can a current transformer be used as a voltagetransformer?Current Transformers cannot be used as a voltage transformers, they are used tomeasure large electrical currents. They are manufactured in the shape of a doughnut, round with a single hole in the middle. The conductor carrying the currentpasses thru this hole. the CT has two terminals, these would be connected to aammeter or can be shorted together. When they are shorted together you can use astandard clamp on ammeter by passing the wire shorting the CT terminals togetherthru the meter jaws. The CT is sized by ratio of turns for the current is measuring,standard ratios of 200 to 5 or 500 to 5 .So if you were meassuring a current of 200amps, your clamp on meter would read 5amps. A panel ammeter would be set up todisplay the amps as 200 amps. Current transformers, when installed should alwayshave their ouput termianls shorted together or attached to an ammeter, to do sootherwise will damage the CT.

What is the reason for using a current transformer in anelectrical service substation?A current transformer is primarily used at the neutral point of a transformer for earthfault protection.

A neutral current transformer will measure any ground fault current which willessentially flow from the star point of the transformer.

A fault-detection device other devices is connected to the current transformer and, ifthe fault current exceeds a certain trigger value, the fault-detection device will give atrip command to an earth-fault relay to disconnect the supply of electricity to thetransformer.

Core balance current transformer?whats a core balance current transformer?

Core Balance CTs are special CTs used to detect Earth faults & usually used forRestricted Earth Fault Protection.

It is a ring type CT through which the cables carrying current of all the three phases(R,Y & B) are passed through. (In a 3phase 3 wire system)

Under normal operating conditions, summation of current through the three phasesshall be equal to zero. In event of a fault, the summation of the current shall nolonger remain zero (zero sequence current shall flow during earth fault) & thus thefault can be detected.



Difference between current transformer and currenttransducer?Current transformer is a device used to measure the flow of current through a powersystem and the measured current is inputted to a protective relay system. It is usedto detect system malfunction. Current transducer is a device used to measure AC and DC current based on thehalt-effect technology.

How do you calculate VA burden of Current Transformer?The method I have seen employed is to estimate the maximum current that will flowin the secondary side of the CT due to fault currents on the primary side, andcalculate the total load (resistance) on the secondary side, including the CTresistance, cable resistance (2 way for ground faults, 1 way for three phase and L-L),resistance of any meters/relays connected to the CT. Once this is known, the voltagerise in the CT can be determined to see if the CT is likely to saturate.

Alternately, you can determine the VA burden by the above, VA = V*I = (I*R)*I, usingOhm's law.

The above answers the question of how to calculate the VA burdon on a currenttransformer. The VA burden of a CT is determined by the resistivity of the CT,multiplied by the current squared through the secondary. In general, this will beprovided by the manufacturer in the form of a CT burden characteristic, developedthrough testing of the CT in question, not through calculations.

Why current transformers secondary is always shortcircuited?Unless a burden (i.e. meters, relays, etc.) is connected to the CT, currenttransformers should always be shorted across the secondary terminals. The reason isvery high voltages will be induced at the terminals. Think of the CT as a transformer,with a 1 turn primary and many turns on the secondary. When current is flowingthrough the primary, the resulting voltage induced in the secondary can be quite high,on the order of kilovolts. When a CT fails under open circuit conditions, the cause offailure is insulation breakdown, either at the shorting terminal strip, or at thefeedthrough (in the case of oil filled apparatus), because the distances betweenterminals are not sufficient for the voltages present.

What is the difference betwen current transformer andpotential transformer?A current transformer is a donut (toroidal) shaped transformer. You use it to measurecurrent (expressed in amperes). You run your wire to be measured through thetransformer and it produces a variable output based on the current.

A potential transformer is basically a high ratio transformer that is used to measurevoltage on high-voltage lines. For example: They will use a 10:1 ratio potentialtransformer to convert 4160v to 416v. Then they can measure this lower voltage witha meter. The meter then applies a user programmed multiplier (10) to this number tocalculate the voltage.

What is difference between a current transformer and apower transformer?A transformer is an electromagnetic device which often consists of two separatewindings around the same iron core. The two windings are called the primary and the



secondary and normally they are electrically insulated from each other. Current in theprimary is normally driven by the circuit to which it is connected. Current in thesecondary normally drives the circuit to which it is connected. Many variations of thistheme exist and most of them aren't relevant here.

A power transformer is intended to transform large amounts of power at one voltageto a very similar amount of power at a different voltage. A little power will always belost in the transformer core and windings, and good transformer design keeps thatloss very small. You will most often come across 'step-down' transformers, where thevoltage on the primary is high and the voltage on the secondary is low. For exampleif you have a model train set with electrically driven trains, for safety reasons thevoltage on the rails has to be quite low - a few volts. Unfortunately for efficiencyreasons the voltage of the power delivered to your home has to be quite high - oneor two hundred volts. A power transformer is used to transform the voltage from thedangerous levels delivered to your home to a few volts, which is much safer. Nobodycares very much how accurately the transformer does this, so a cheap transformerwith a turns ratio of the order of a hundred (on the primary) to one (on thesecondary) will do. Note that in a power transformer, the voltage ratio from primary tosecondary is approximately the same as the turns ratio of primary to secondary. Theprimary winding will usually be placed on the core first, then the secondary windingwill be wound on top of that.

A current transformer is usually a measurement device. The emphasis here is onmeasurement, not on power transformation, and on accuracy, not on efficiency. If youwork in a power station and you want to measure a current of tens of thousands ofamperes you might not have a multimeter which has a range that high. So you canuse a current transformer to make the measurement. The current transformer will(usually) mirror the flow of current in its primary with a current in its secondary whichis exactly proportional to the flow in the primary but very much smaller. For examplea current transformer with a turns ration of one (on the primary) to ten thousand (onthe secondary) will produce a current in the secondary of one ten-thousandth of thecurrent in the primary. Then your multimeter, connected directly across the secondaryof the transformer and set to measure current, will register only 100 milliamps whenthere is a current in the primary of a thousand amps. Do not connect a multimeter ona current range to the secondary of a power transformer!

When a power transformer is not being used, the primary winding can be leftconnected to the power supply and the secondary winding can simply bedisconnected. The transformer itself will consume very little power. With a currenttransformer, if it is left in circuit when it is not being used then the secondary windingmust be short-circuited; otherwise dangerous voltages will be developed in thewinding which may destroy insulation. Do not short-circuit the secondary of a powertransformer!

http://en.wikipedia.org/wiki/Current_transformer-- GWH --

CURRENT TRANSFORMER:Think firstly of ac current indication on a distribution switchboard incomer - maybe ona power condition monitoring relay or an incomer protection relay.For a low voltage board ( 400V ) it may be several hundred amps or more.This current cannot flow directly through the relays, due to a number of reasons ofpracticality.The size of terminations & separation are not suitable for starters - consider the csaof bus bars carrying a few hundred amps....A current transformer is an interface device which will provide a secondary windingcurrent, proportional to that a) in its primary winding if wired or b) the conductorpassing through its centre ( torroidal CT ), which can be used for metering, protection& indication purposes. CTs have standard ratios available, ie 100:5 & 2000:1 arecommon, & are also accuracy classed. Certain protection applications will requirematched pairs of CTs to be used at higher accuracy levels.



CTs are tested to demonstrate their kneepoint, which is the point at which theysaturate, electromagnetically.A typical application of CTs would be on a large motor feeder circuit. At the MCC, theoutgoing cable ends wound each pass through perhaps a 100 : 5 CT, & then allthree cables would pass through a common CT for earth fault detection which maybe2000:1 ratio.POWER TRANSFORMER:Changes voltage level up for distribution or down for consumption.Range from a few VA rated, to several hundred MVA.Can be tapped to control voltage.May be star or delta connected on each winding, and give phase shift depending onthis connection & resultant vector group. eg Dyn11May be air or oil, forced or natural cooled - ONAN, ONAF ( with fans ), OFAF ( fansand pumps )Are protected for over temp, over pressure, over current, gas in oil etc.CTB.

How current transformer works explain with circuitdiagram?Current transformers are used to transform high currents to standardized values forcontrol equipment as relays and meters.The primary winding in a current transformeris incorporated in the line and carries the current flowing in the network. Themagnitude of the secondary current is dependent of the ratio of the transformer.Acurrent transformer (CT) is a type of instrument transformer designed to provide acurrent in its secondary winding proportional to the alternating current flowing in itsprimary. They are commonly used in metering and protective relaying in the electricalpower industry where they facilitate the safe measurement of large currents, often inthe presence of high voltages. The current transformer safely isolates measurementand control circuitry from the high voltages typically present on the circuit beingmeasured.The most common design of CT consists of a length of wire wrapped manytimes around a silicon steel ring passed over the circuit being measured. The CT'sprimary circuit therefore consists of a single 'turn' of conductor, with a secondary ofmany hundreds of turns.The CT acts as a constant-current series device with anapparent power burden a fraction of that of the high voltage primary circuit. Hencethe primary circuit is largely unaffected by the insertion of the CT.UsageCurrenttransformers are used extensively for measuring current and monitoring the operationof the power grid. The CT is typically described by its current ratio from primary tosecondary. Often, multiple CTs are installed as a "stack" for various uses (forexample, protection devices and revenue metering may use separate CTs). Similarlypotential transformers are used for measuring voltage and monitoring the operation ofthe power grid.

What is the relationship between a current transformerand a voltage transformer?A transformer is a device that steps up, or steps down voltage. During this processcurrent is also stepped up or down:however, voltage and current are inverselyproportional ( meaning an increase in voltage results in a decrease in current andvice versa ) As an example: A step up transformer of 10:1 ratio with 12 volts and 10amper of current applied to the primary will have ten times the voltage ( 120 volts )and ten times less current ( 1 amrere ) at the secondary...and a step downtransformer with the same turns ratio with 120 volts and 1 ampere applied to theprimary will have 12 volts and ten ampere available at the secondary. The electricitysupplied into homes and business uses wires carrying very high voltage and lowcurrent over long distances, then uses step down transformers to step down thevoltage and step up the current.

However, in power engineering and protective relaying applications, there are whatare called "instrument transformers" which have the specific purpose of providing



information to devices (such as relays or meters) about the voltages or currents inthe power system. Therefore, there are some differences in construction andconnectivity between a Current Transformer (CT) and a Voltage (or Potential)Transformer (PT).

A CT will typically have a toroidal core and evenly distributed secondary windings soas to minimize leakage reactance. The primary is typically the main power lineconductor, which passes directly through the toroidal core. This type of transformer isspecifically for the purpose of measuring current values, and the secondary windingscannot be left open-circuited, or a large voltage will be produce, resulting in dielectricfailure (and often an explosion). If a device is not connected to the CT, its secondarymust be short-circuited.

A PT is connected between the main conductor and ground and can be either woundin the normal way, or the voltage can be taken from a subsection of a string ofcapacitors (this is called a Capacitive Voltage Tansformer or CVT, and is usuallycheaper than the wound type, but is typically not as accurate). This type oftransformer measures voltage values, and the secondary winding cannot be short-circuited, as this will produce excessively high currents, resulting in the failure of thePT or the wires it is connected to. A PT can be left open-circuited.

How do you disconnect ammeter from currenttransformer?A CT's secondary winding must never be open circuited as it may provide a shockhazard to the user. The terminals to which an ammeter is connected to a CT isnormally provided with a set of links that must be closed, short-circuiting the CT,before the ammeter can be removed. The ammeter must the be reinstalled beforethe shorting links are reopened.

Why you must never leave the secondary of a currenttransformer open circuited?If current flows in the primary with the secondary open circuit, a large voltage will beproduced on the secondary most likely causing it to burn up. The condition is verydangerous and should be avoided.so,the secondary of the current transformer shouldbe always close circuited.

What happen when current transformer saturate?I am assuming that we are referring to an ordinary power transformer working at 50-60 Hz of alternating current circuit system. Saturation in these transformers is theresult of the magnetic field in the iron core reaching the saturation phase. At lowcurrent levels on the input side (currents are measured in amperes or amps) themagnetic filed produced in the core increases linearly with the current. Consequently,the current produced in the output coils is proportional to the input currents. If theamount of current in the input coil is large, the magnetic field in the core will not be asmooth sine wave, but a sine wave with tops and bottoms chopped as the magneticcore reaches saturation at the peak current level. This happens even if the inputcurrent remains a sine wave. The current induced in the output is directly proportionalto the magnetic field and hence has the same shape - chopped off sine wave. Hereare some of the implications: 1. Energy transfer from input to output is now limited by the chopping process whichlimits the peak current that can be induced into the output coil. 2. Energy transfer efficiency goes down - more energy may be poured in, but outputenergy does not increase significantly. Transformer will heat up as input coilsexperience greater currents. There will also be greater heating of the magnetic coredue to magnetic hysteresis effects. 3. The output current has a chopped sine wave shape and hence has more



'harmonics' - waves with frequencies that are multiples of the input waves. The outputcurrent wave shape resembles a square wave more than the input sine wave. This isakin to waves produced by electric guitar distortion equipment. While this may not beimportant in some applications such as heating, it is usually unacceptable in audiotransformers.

How do you do a megger test on a current transformer?to perform insulation test on the ctyou need a conductor on the primary side.connect the equipment test lead one o the coductor on primary and the other to thesecondary

What is magneto optical current transformer?moct is device measure the current by means of faraday's effect..

What is the difference between 5P10 and 5P20 currenttransformers?

PS class means protectionclass CT. 5P10 means 5% errorshown while 10 times fault current flows.and 5P205% error shown while 20 times fault current flowshence 5P20 superior comparing to 5P10

What is knee point voltage of current transformer?10 % increase in voltage gives you 50 % increase in excitation current is called knee point voltage.To measure this first demagnetise the CT and applyvoltage gradually from secondary keeping primarywinding open circuited. while doing this above phenomeneo will be obsesrved.

Why secondary of current transformer not to be keptopen?The secondary of a CT must always have a load connected. An open circuitsecondary can result in the development of a dangerously high secondary voltage. Ifa CT is energized but is not used, the output terminals of the CT must be shortedout.

Current transformers vs potential transformers?Current tranformers transform amps(current) and usually have ratios of 100/1 or2400/1. They come in different classes and accuracy factors depending on theapplication which can be for instrumentation or protection. Voltage transformers transform voltage. Either up, like at power stations fortransmission to distribution, or down, like your cellphone charger from your housesupply to the low voltage your cellphone needs. Ratios are for example 6600/400Volts or 110/12 Volts. they also come in different classes and ratings as needed.



What is Ratio error and phase error in a CurrentTransformer?RATIO ERRORThe secondary current is less than the expected value. Thesecondary is less in magnitude. This diffence is known as ratio error.PHASEERRORThe angle between the expected and actual secondary current is known asphase error.

What is current transformer and its function?A current transformer is used in high voltage circuits where it is not possible tomeasure current directly. A CT is a step up transformer with only one turn in primary.There will be as many cores based on the purposes like metering, protection etc. Thesecondary of a CT should never be kept open circuited bcoz very high flux will bedeveloped in the secondary and hence it may be damaged.

How to calibrate a current transformer?how to calibrate current transformer ?

What types of current transformer?CURRENT TRANSFORMERS ARE BROADLY CLASSIFIED ASRING TYPE CTs : A CT which has an opening in the center to accommodate aprimary conductor (busbar or cable) through it.BAR -PRIMARY CTs A CT in which the primary winding consists of bar of suitablesize and, material forming an integral part of the CT.WOUND TYPE CTs : A CT having a primary winding of more than ane full turnwound on the core.

Ring type (or rectangular type) CTs are normally preferred over other types of CTs.because they are simple in construction, mechanically stronger and cheaper. In a ringtype/bar primary type CTs the working ampere-turns are determined by the primarycurrent and therefore necessarily, the accuracy that can be offered with these CTsbecomes progressively inferior as the rated primary current decreases.'-If higheraccuracy and burdens are required for CTs of low primary current wound types CTsare used.

Current transformers are also classified in accordance with their nature of application,i.e.MEASURING CURRENT TRANSFORMER & PROTECTIVE CURRENTTRANSFORMER. CTs can be manufactured to suit above individual application orcombined dual purpose application.FOLLOWING ARE FEW GENERAL TYPES OF CTs.

1) INTERPOSING CTs. : These CTs are used in conjuction with main CTs to alterthe ratio of main CT or to provide isolation to meters or relays from main CTssecondary circuit. Primary current of these CTs are generally lower than 1 0 amp.Due to which they are always wound primary types.

2) SUMMATION CTs : 'When current flowing, in more than one feeder is required tobe meteredi summation current transformer are used. These CTs are provided withmore than one primary winding and one common secondary. The standard primary &secondary currents are 5 or 1 amp. Summation current transformers are generallymanufacture-confirming to ISS 6949.

3) BUSHING TYPE OR BUSDUCT CTs These CTs are Ring type construction & can



be mounted on Busduct or Bushing turrert of power transformer.

4) CORE BALANCE CTs : These are ring type CTs & suitable for the measurementof the sum of three phase currents in a 3-ph cable. Under normal operatingconditions this sum is zero. In the event of an earth-fawt the sum of the current isequal to the zero sequence current. These CTs are generally used with EnglishElectric make CTUM 15 static relay. It is necessary to specify leakage current to bedetected along with minimum setting of the relay and size of cable at the time ofordering CT.

5) FURNACE TRANSFORMERS : These transformers are generally split core typewhich can be easily mounted on the bus of furnace transformer. Primary current ofthese transformers are o value 10,000 Amp & above.? Special precaution isnecessary to reduce the heat de@eloped in the transformers due to eddy currentduring design and manufacture.

6) PRECISION GRADE CURRENT TRANSFORMERS : These CTs are of accuracyof 0.1, 0.2 or 0.5 and used as a standard current transformer to check

accuracies of other transformer. These current transformers are either wound primaryor ring type and manufactured -in. teakwood cases.

What is class PS in current Transformer?What is class PS in current transformer. application

How does current transformer works in a substation?A current transformer works on the same principle as that of a simple transformerhowever it steps down the high current into a low level so that it can be measuredusing an ammeter of a suitable range. In some current transformers extra cores areprovided. This is done in order to prevent the faulty currents i.e. the over currents,earth faults, differential protections. The extra cores of a C.T. gets saturated as soonas the faulty currents starts flowing and thereby does not harm the main core of thetransformer and the ammeter connected. The C.T. is always connected in the linecarrying current. It first steps down the current to a measureable form and furthergives this current to the ammeter.

Why current transformer connect in series in powersystem equipment?CT(Current Transformer) is used to measure current flowing in the circuit. Currentcan be fully drawn or sensed in series condition. That's why , it is connected inseries.

In parallel , the current is divided; and hence the total current cannot be measured)

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