IEC 60214-2 PDF
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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It is important to us that you purchase the right document. Transformers with this mechanism obtain this variable turn ratio by connecting to a number of access points known as taps along either the primary or secondary winding.
International Classification for Standards ICS is an international classification system for technical standards. Automatic tap changers can be placed iev a lower or higher voltage winding, but for high-power generation and transmission applications, automatic tap changers are often placed on the higher voltage 6214-2 current transformer winding for easy access and to minimize the current load during operation.
The disadvantage is that these tap changers are lec complex and require a low voltage power supply for the thyristor circuitry. 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.
Also assists in understanding the various types of tap-changers and their associated equipment available.
Also called On Circuit Tap Changerin applications where a supply interruption during a tap change is unacceptable, the transformer is often fitted with a more expensive and complex on load tap changing mechanism.
Thyristor-assisted tap changers use thyristors to take the on load current while the main contacts change over from one tap to the next. One possible design flag type of on load mechanical tap changer is shown to the right.
Views Read Edit View history. All of the winding taps will then be routed into the tap changer compartment through a terminal array.
Tap changer – Wikipedia
This is a relatively recent development which uses thyristors both to switch idc transformer winding taps and to pass the load current in the steady state. It commences operation at tap position 2, with load supplied directly via the right hand connection. Amorphous metal transformer Austin transformer Autotransformer Buck—boost transformer Capacitor voltage transformer Distribution transformer Delta-wye transformer Energy efficient transformer Flyback transformer Grounding transformer Instrument transformer Current transformer Potential transformer Isolation transformer Linear variable differential transformer Pad-mounted transformer Parametric transformer Planar transformers Rotary transformer Rotary variable differential transformer Scott-T transformer Solid-state transformer Trigger transformer Variable-frequency transformer Zigzag transformer.
This prevents arcing isc the main contacts and can lead to a longer service life between maintenance activities. Wikimedia Commons has media related to Tap changers.
Solid state tap changers are typically employed only on smaller power transformers. Retrieved from ” https: Assists in the selection of tap-changers designed in accordance with IEC for use in conjunction with the tapped windings of transformers or reactors. We recommend that you check the website of the publishers of the international document before making a purchase.
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From Wikipedia, the free encyclopedia. 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. This technique overcomes the problems with open or short circuit taps. To reduce arcing at the contacts, the tap changer operates in a chamber filled with insulating transformer oilor inside a vessel filled with pressurized SF 6 gas.
On load tap changers may be generally classified as either mechanical, electronically assisted, or fully electronic. This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations.
If you need help with the purchase or have any queries please email enquiries standards. This page was last edited on 15 Septemberat A tap changer is a mechanism in transformers which allows for variable turn ratios to be selected in discrete steps. Follow these links to find other Standards similar to the one you are viewing. 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.
Some arcing is unavoidable, and both the tap changer oil and the switch contacts will slowly deteriorate with use.
IEC 60214-2 Ed. 1.0 en(2004)
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.
Please help to improve this article by introducing more precise citations. 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. Siemens — via http: In such systems, the tap changer will often be set just once, at the time of installation, although it may be changed later to accommodate a long-term change in the system voltage profile.
In moving to tap 3, the following sequence occurs:. Diverter resistor A is short-circuited; diverter B is unused. Articles lacking in-text citations from September All articles lacking in-text 602214-2 Commons category link is on Wikidata.
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. Covers both on-load tap-changers and off-circuit tap-changers.