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Topic: Current transformer

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	AC Current Transformers or Current Sensors
		A current transformer is a type of transformer that is usually placed in the main circuit to step down a high current circuit to drive a low current device, usually a low current meter or resistor.
		The primary winding current is essentially made up of three components; the loss current that supplies iron and copper loss, the magnetizing current that establishes the flux in the core and the load current.
		If high accuracy current transformer is needed, the loss and magnetizing current need to be kept as low as possible so that the secondary current will truly reflect the primary current which is also the current to be measured or sensed.
	www.toroid.com /knowledge_base/AC_current_transformers.htm (937 words)

	current transformer
		A typical application of current transformers is the current control of heater bands or heating groups at extrusion systems, injection moulding machines or other machines where heating is an important parameter for product quality.
		The current transformer is connected to the measuring instrument by binders (+) and (-).
		Current transformers are suitable for monophase or threephase current.
	www.engelke-online.de /currenttransformer.htm (240 words)

	Toroidal Current Transformers
		The term “toroidal” refers to the shape of the core that the winding of a toroidal current transformer is wound on.
		In contrast, the term “split-core” in split-core current transformers is used because the transformer core is split into two pieces which allow it to be assembled and disassembled around a buss bar without disconnecting either end of the buss bar.
		In application, the toroidal current transformer is slipped over an end of a high current wire or buss bar, which conducts the primary current.
	www.butlerwinding.com /elelectronic-transformer/current/toroidal.html (2158 words)

	Transimpedance Amplifier Buffers Current Transformer - Maxim/Dallas
		Technically, the terms differ: a transimpedance amp delivers an output voltage that is a function of the input current; conversely, a transconductance amp converts a voltage to a current.
		Current transformers are not only a convenient means for current measurement in many applications, but also provide isolation while absorbing very little power from the source.
		Thus, connecting a current transformer to the input shorts that summing node directly to ground, causing the output (VOUT) to equal the input offset multiplied by the amplifier's open-loop gain.
	www.maxim-ic.com /appnotes.cfm/appnote_number/3428 (561 words)

	Transformer - Wikipedia, the free encyclopedia
		The ratio of the currents in the primary and secondary circuits is inversely proportional to the turns ratio.
		That is, the ratio between the primary and secondary currents is the inverse of the ratio between the corresponding voltages.
		In the latter case, the transformer's secondary is resonated with the cable's capacitance.
	en.wikipedia.org /wiki/Transformer (7851 words)

	Current transformers,Voltage transformers and Instrument transformers:India
		Their role in electrical systems is of primary importance as they are a means of "stepping down" the current or voltage of a system to measurable values, such as 5A or 1A in the case of a current transformers or 110V or 100V in the case of a voltage transformer.
		In a "practical" transformer, errors are introduced because some current is drawn for the magnetization of the core and because of drops in the primary and secondary windings due to leakage reactance and winding resistance.
		Their performance is defined in terms of a knee-point voltage (KPV), the magnetizing current (Imag) at the knee point voltage or 1/2 or 1/4 the knee-point voltage, and the resistance of the CT secondary winding corrected to 75C.
	www.kappaelectricals.com /technical.html (2229 words)

	Current Transformer Measurements
		The current error is the error which a transformer introduces into the measurement of a current and which arises from the fact that the actual transformation ratio is not equal to the rated transformation ratio
		If i is the nominal secondary current and a and b are respectively the errors of the comparator and the test transformer secondary currents, the compensation winding current is (i + a) - (i + b) which is equal to (a - b).
		Routine current transformer calibrations can be carried out over a large range of primary to secondary current ratios, generally to rated secondary currents of 1 A and 5 A. Measurements are made at defined frequencies, burdens and power factors according to the customer's requirements.
	www.npl.co.uk /electromagnetic/dclf/magnetics/currenttx.html (884 words)

	Transconductance Amplifier Buffers Current Transformer - Maxim/Dallas
		Current transformers, which offer a convenient means for current measurement in many applications, also provide isolation while absorbing very little power from the source.
		The output current from a current transformer can be converted to voltage with a resistor of a suitable value, but that approach can dramatically reduce the transformer's high frequency response.
		These forms of the transconductance amplifier are useful for inputs that closely resemble an ideal current source, as does (for example) a photo-diode preamplifier, but they are not suitable for use with a current transformer.
	www.maxim-ic.com /appnotes.cfm/appnote_number/3285 (515 words)

	A current transformer design (Site not responding. Last check: 2007-10-10)
		In linear current transformers there are generally air gaps in the iron core to reduce the time constant and remanence.
		These are auxiliary current transformers in which a small air gap is included in the core to produce a secondary voltage output proportional in magnitude to current in the primary winding.
		Sometimes termed ´transactors´ or ´quadrature current transformers´, this form of current transformer has been used as an auxiliary component of unit protection schemes in which the outputs into multiple secondary circuits must remain linear for and proportioned to the widest practical range of input currents.
	leeh.ee.tut.fi /transformer/tra351.htm (563 words)

	Exploring Current Transformer Applications - current transformer
		Current monitoring is necessary at frequencies from the 50 Hz/60 Hz power line to the higher frequencies of switchmode transformers that range into the hundreds of kilohertz.
		The object with current transformers is to think in terms of current transformation rather than voltage ratios.
		Current ratios are the inverse of voltage ratios.
	powerelectronics.com /mag/power_exploring_current_transformer (659 words)

	Transformer - HvWiki
		This is accomplished using a current transformer (CT), a "donut" (toroidal) shaped core through which is threaded the wire whose current is to be measured.
		Current transformers are designed to produce either an alternating current or alternating voltage proportional to the current being measured.
		These transformers use a tank circuit composed of a high-voltage resonant winding and a capacitor to produce a nearly constant average output with a varying input.
	wiki.4hv.org /index.php/Transformer (1387 words)

	Current Transformers Toroidal Split Core Transformers
		Since it is used to measure current, a current transformer is often classified as a type of instrument transformer.
		A current transformer can accurately measure the alternating current and put out a reasonable voltage, which is proportional to the current, but without as much heat and size that an appropriate resistor would require.
		Split core current transformers are designed so that they can be assembled around a buss bar without disconnecting the buss bar.
	www.butlerwinding.com /elelectronic-transformer/current/index.html (1605 words)

	TESCO Current Transformer Field Test Set (Site not responding. Last check: 2007-10-10)
		The Catalog 1043 Current Transformer Field Test Set is a simple and inexpensive means whereby a current transformer installation may be quickly checked for many sources of trouble.
		Extensive precautions have been taken in the design so that there will be a continuous and closed path in the watthour meter current circuit at all times, and the secondary of the current transformer will not be opened by accident.
		Current ranges selected such that a half-scale reading on any range will be a full-scale deflection on the next lowest range.
	www.tesco-advent.com /tesco-current.html (361 words)

	Current Transformer Design Software from MAGNETICS®
		Their main purpose is to produce, from the primary current, a proportional secondary current that can easily be measured or used to control various circuits.
		The primary winding is connected in series with the source current to be measured, while the secondary winding is normally connected to a meter, relay, or a burden resistor to develop a low level voltage that is amplified for control purposes.
		In the specific case of current sensors, the Hall generator/sensor is placed within air gap of a magnetic core.
	www.mag-inc.com /software/transformer.asp (441 words)

	Transformer Testing
		Our voltage and current transformer test equipment is used by electric utilities throughout the world to verify the accuracy of transformers used to measure electric energy.
		The transformers are supplied on a wheeled dolly and are designed to be placed one on top of the other for ease of use and minimum footprint.
		The KATC Automatic Transformer Comparators are used to check the accuracy of an unknown transformer by comparing it to a known reference transformer.
	www.knoppinc.com /transfor.htm (600 words)

	Current transformer test set
		The Current Transformer Test Set, Model CTX-2000 has been designed to test current transformers for Excitation, Saturation, Ratio and Polarity.
		A SATURATION test is performed by applying voltage to the current transformer which increases the test current linearly until near saturation at which time a large increase of current is easily seen on the bar graph meter and accurately read on the digital ammeter.
		Current transformers can be tested while mounted in bushings.
	www.adwel.com /current.html (292 words)

	current transformer Manual
		Power Modules current transformers are ring type toroidal transformers for primary or application currents from 50 to 800 amps.
		The 5A secondary of the current transformer is then connected directly to the PSM with the PSM amp range set at 5A.
		When current is flowing through the primary of the current transformer, always have a wire between the secondary terminals.
	www.brunelcorp.com /ECC/CTX.HTM (325 words)

	Constant-Current Transformer
		When larger regulators must be installed and are not readily available, a booster transformer may be used with its secondaries connected into the series street circuit and its primaries connected to the primary feeder supplying the regulator (fig.
		The additional load handled by this device preferred to an ordinary distribution transformer for use equals the product of the street-circuit current and the with constant-current regulators of 10 kilowatts and secondary voltage of the transformer.
		In using a booster transformer, the primary coil 2,400/ 240-volt transformer is used, the additional load Since transformers used for this purpose should have must be isolated from the secondary coil that
	www.tpub.com /ceb/88.htm (732 words)

	Current Transformers
		Coil Craft 50/60 Hz current transformer measures 5-50 amps with a 1 turn primary passing through center hole.
		Weston portable, adjustable current transformer with 10, 25, 50, 100, 250, 500 and 1000 amp ranges.
		Current control relay opens single 75 amp 30 vdc contact when 50 amps is drawn through coil.
	www.surplussales.com /Transformers/CurrentT-1.html (537 words)

	Residual-current device - Wikipedia, the free encyclopedia
		A residual current device (RCD), or residual current circuit breaker (RCCB), is an electrical wiring device that disconnects a circuit whenever it detects that the flow of current is not balanced between the phase ("hot") conductor and the neutral conductor.
		RCDs operate by measuring the current balance between two conductors using a differential current transformer, and opening the device's contacts if there is a balance fault (i.e.
		Residual current detection is complementary to, rather than a replacement for, conventional over-current detection, as residual current detection cannot provide protection for faults which do not involve an external leakage current, for example faults that pass the current directly from one side of the circuit through the victim to the other.
	en.wikipedia.org /wiki/Residual-current_device (1783 words)

	Current-Doubler Rectifier Reduces Ripple Current
		Also, a finer resolution in the transformer turns ratio is possible since the two secondaries of the full-wave rectifier are replaced with a single secondary winding in a current-doubler application.
		However, because the volt-seconds applied to the transformer primary must be equal for each half of the power-transfer cycle, the current doubler is limited to a maximum duty cycle of 50% per phase.
		The transformer turns ratio deserves attention as it has direct effect upon the amount of output ripple-current cancellation that can be achieved.
	powerelectronics.com /mag/power_currentdoubler_rectifier_reduces (1189 words)

	Trio Transformer-Control transformers, current transformer, line communicating chokes India
		A control Transformer is a Transformer, which supplies power to control and or Auxiliary Equipment not intended for Direct Connection to the Main Circuit.
		Control Transformer is specifically used to provide control supply voltage for the control circuits of AC Motor Starter.
		Current Transformer is used for measuring current and protects the Electro - Mechanical systems.
	triotransformer.com (332 words)

	Current transformer series
		Resistance of current transformer is very low,so that secondary winding of current transformer should be operated as a short-circuit,when required...
		The most current transform need the special mounting and the MES series used the mounting of DIN typing......
		The DP series of current transformers have been especially designed to facilitate their installation in new or already existing networks.
	www.accontactor.com /current-transformer.html (186 words)

	Current measurement transformer with the European leader Enerdis division
		The current measurement transformer is specially adapted to meet the customer's specific needs or a unique and original design created in one of its six R & D centers and manufactured in one of its production sites (4 in France,.
		The current measurement transformer belongs to the power, measurement and control range of products.
		The current measurement transformer, together with current totalizer transformer, protection for C.T. and measurement shunt belong to the LV current transformer, measurement shunts.
	www.chauvin-arnoux.com /current_measurement_transformer.html (156 words)

	Sola/Hevi-Duty Transformers
		When connected properly, these transformers can be used to raise or lower the supply voltage to match the needs of the load.
		If the load is expressed in KVA, select the appropriate transformer from the following selection charts (make sure the selected transformer's KVA rating is equal to or greater than the required load KVA).
		Some applications may require a transformer design that limits the BTU output of the unit at full load or a design to withstand and mitigate specific electridcal anomalies.
	www.sola-hevi-duty.com /products/transformers (505 words)

	Test Set Performs Current Transformer Saturation Test
		Apr 12, 2006 3:04 PM The EZCT-S2 from Vanguard Instruments is a second-generation, microprocessor-based, current transformer set.
		The EZCT-S2 will perform the current transformer saturation test and the CT (current transformer) turns-ratio automatically.
		Test voltage and current data are collected and stored in the EZCT-S2 internal memory.
	tdworld.com /test_monitor_control/highlights/Vanguard-test-set (601 words)

	Current Transformers, Transformer Winding Services, Current Transformer Manufacturers
		Designed to provide a convenient and cost effective means of installing current tranformser (CT's) for metering onto different sized busbars and cables.
		High accuracy standard current transformers designed to a very wide range of specifications.
		A complete custom design service is available to provide you with exactly the tape wound current transformer for your specific requirements.
	www.transformer.co.nz /CurrentTransformers.htm (107 words)

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