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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From Wikipedia, the free encyclopedia. This technique overcomes the problems with open or short circuit taps.
To reduce arcing at the contacts, the tap changer 602214-2 in a chamber filled with insulating transformer oilor inside a vessel filled with pressurized SF 6 gas. The disadvantage is that these tap changers are more complex and require a low voltage power supply for the thyristor circuitry. However, a transformer may include a tap changer on each winding if there are advantages to do so.
A tap changer is a mechanism in transformers which allows for variable turn ratios to be selected in discrete steps.
Diverter resistor A is short-circuited; diverter B is unused. In moving to tap 3, the following sequence occurs:. 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. It commences operation at tap position 2, with load supplied directly via the right hand connection.
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 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. 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. Follow these links to find other Standards similar to the one you are viewing.
If only one tap ifc is required, manually operated tap points are usually made on the high voltage primary or lower current winding of the 6014-2 to minimize the current handling requirements of the contacts.
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.
During a tap change operation, the potential rapidly increases between the two electrodes in the 6014-2, and some of the energy is dissipated in an arc discharge through the bottle instead of flashing across the diverter switch contacts. Views Read Edit View history. Assists in the selection of tap-changers designed in accordance with IEC for use in conjunction with the tapped windings of transformers or reactors.
They are often more costly ief this method is used in some modern transformers. 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.
IEC 60214-2 Ed. 1.0 en(2004)
Covers both on-load tap-changers and off-circuit tap-changers. The iex selection on any tap changer may be made via an automatic system, as is often the case for OLTC, or a manual tap changer, which is more common for NLTC. In other projects Wikimedia Commons. Articles lacking in-text citations from September All articles iecc in-text citations Commons category link is on Wikidata.
Alternatively, in some systems, the process of tap changing may be assisted by means of a rotary or slider switch. Siemens — via http: September Learn how and when to remove this template message.
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We recommend that you check the website of the publishers of the international document before making a purchase. 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.
This page was last edited on 15 Septemberat Also assists in understanding the various types of tap-changers and their associated equipment available.
Tap changer – Wikipedia
Please help to improve this article by introducing more precise citations. 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.
Some arcing is unavoidable, and both the tap changer oil and the switch contacts will slowly deteriorate with use.
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 mode You may be interested in this related standard.
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60241-2 changers typically use numerous tap selector switches which may not be switched under load, broken into even and odd banks, and switch between the banks with a heavy-duty diverter switch which can switch between them under load.
For example, in power distribution networks, a large step-down transformer may 602114-2 an off-load tap changer on the primary winding and an on load automatic tap changer on the secondary winding or ieec. Thyristor-assisted tap changers use thyristors to take the on load current while the main contacts change over from one tap to the next. Solid state tap changers are typically employed only on smaller power transformers.