test code for step-voltage regulators. IEC , Insulated bushings for alternating voltages above 1 V. IEC , Tap-changers – Part 2. This part of IEC is intended to assist in the selection of tap-changers designed in accordance with IEC or IEEE Std. C for use in. Tap-changers –. Part 2: Application guide. Reference number. IEC (E). This is a free 6 page sample. Access the full version online.
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IEC 60214-2 Ed. 1.0 en(2004)
In other projects Wikimedia Commons. September Learn how and when to remove this template message. Solid state tap changers are typically employed only on smaller power transformers. A mechanical tap changer physically makes the new connection before releasing the old using multiple tap selector switches but avoids creating high circulating currents by using a diverter switch to temporarily place a large diverter impedance in series with the short-circuited turns.
We recommend that you check the website of the publishers of the international document before making a purchase. Automatic tap changers can be placed on a lower or higher voltage winding, but for high-power generation and transmission applications, automatic tap changers are often placed on the higher voltage lower current transformer winding for easy access and to minimize the current load during operation.
To prevent contamination of the tank oil and facilitate maintenance operations, the diverter switch usually operates in a separate compartment 602142 the main transformer tank, and often the tap selector switches will be located in the compartment as well. Assists in iiec selection of tap-changers designed in accordance with IEC for use in conjunction with the tapped windings of transformers or reactors. However, a transformer may include a tap changer on each winding if there are advantages to do so.
Articles lacking in-text citations from September All articles lacking in-text citations Commons category link is on Wikidata. Tap changers exist in two primary types,  no load tap changers NLTC which must be de-energized before the turn ratio is adjusted and on load tap changers OLTC which may adjust their turn ratio during operation.
Application guide This document has been re-assessed by the committee, and judged to still be up to date. On load tap changers may be generally classified as either mechanical, electronically assisted, or fully electronic. Wikimedia Commons has media related to Tap changers. For example, in power distribution networks, a large step-down transformer may have an off-load tap changer on the primary winding and an on load automatic tap changer on the secondary winding or windings.
It is designed to cover every economic sector and virtually every activity of the humankind where technical standards may be used. This 6014-2 consumption can add up to a few kilowatts which appears as heat and causes a reduction in overall efficiency of the transformer; however, it results in a more compact design that reduces the size and weight of the tap changer device. This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations.
A tap changer is a mechanism in transformers which allows for variable turn ratios to be selected in discrete steps. The disadvantage is that all non-conducting thyristors connected to the unselected taps still dissipate power due to their leakage currents and they have limited short circuit tolerance. If only one tap changer is required, manually operated tap points are usually made on the high voltage primary or lower current winding of the transformer to minimize the current handling requirements of the contacts.
This technique overcomes the problems with open or short circuit taps. Safety of power transformers, power supply units and similar – Particular requirements – Particular requirements for isolating transformers and power supply units incorporating isolating transformers You may be interested in this related standard Safety of transformers, reactors, power supply units and similar products for supply voltages 60214-22 to 1 V — Part 2.
To minimize the 602142 of winding taps and thus reduce the physical size of a tap changing transformer, a ‘reversing’ tap changer winding may be used, which is a portion of the main winding able to be connected in its opposite direction iecc and thus oppose the voltage.
This page was last edited on 15 Septemberat A reactance type tap changer uses a dedicated preventive autotransformer winding to function as the diverter impedance, and a reactance type tap changer is usually designed to sustain off-tap loading indefinitely.
The disadvantage is that these tap changers are more complex and require a low voltage power supply for the thyristor circuitry.
Although we endeavour to maintain an up-to-date catalogue, on occasion we may not have the latest version uec a document, including where it has not yet been provided through an international feed. From Wikipedia, the free encyclopedia. They are often more costly but this method is used in some modern transformers.
Siemens — via http: Reactance-type tap changers, when operating in oil, must allow for the additional inductive transients generated by the autotransformer and commonly include a vacuum bottle contact in parallel with the diverter switch. Particular requirements and tests for switch mode power supply units and transformers for switch 600214-2 You may be interested in this related standard.
It commences operation at tap position 2, with load supplied directly via the right hand connection. Agbioeletric Balun Buchholz relay Bushing Center tap Circle diagram Condition monitoring of transformers Copper loss Dissolved gas analysis Electrical insulation paper Growler High-leg delta Induction regulator Leakage inductance Magnet wire Metadyne Open-circuit test Polarity Polychlorinated biphenyl Quadrature booster Resolver Resonant inductive coupling Severity factor Short-circuit test Stacking factor Synchro Tap changer Toroidal inductors and transformers Transformer oil Transformer oil testing Transformer utilization factor Vector group.
The low voltage tap may be requested to change positions multiple times each day, without interrupting the power delivery, to follow loading conditions on the low-voltage secondary winding network. The high voltage tap is set to match long term system profile on the high voltage network typically supply voltage averages and is rarely changed.
IEC – IEC Tap changers. Part 2: Application guide
Please help to improve this article by introducing more precise citations. Follow these links to find other Standards similar to the one you are viewing. Thyristor-assisted tap changers use thyristors to take the on load current while the main contacts change over from one tap to the next. In a typical diverter switch, powerful springs are tensioned by a low power motor motor drive unit, MDUand then rapidly released to effect the tap changing operation.
This is a relatively recent development which uses thyristors both to switch the transformer winding taps and to pass the load current in the steady state. If you need help with the purchase or have any queries please email enquiries standards.
In moving to tap 3, the following sequence occurs:. The result operates like a dual-clutch transmissionwith the tap selector switches taking the place of the gearbox and the diverter switch taking the place of the clutch.
Also assists in understanding iwc various types of tap-changers and their associated equipment available. No load tap changers are also employed in high voltage distribution-type transformers in which the system includes a 60214–2 load tap changer on the primary winding to accommodate transmission system variations within a narrow band around the nominal rating.