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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Tap 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.
They are often more costly but this method is used in some modern transformers. September Learn how and when to remove this template message. 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.
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.
Wikimedia Commons has media related to Tap changers. Views Read Edit View history. 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. From Wikipedia, the free encyclopedia. One possible design flag type of on load mechanical tap changer is shown to the right.
This page was last edited on 15 Septemberat Application guide This document has been re-assessed by the committee, and judged to still be up to date. Articles lacking in-text citations from September All articles lacking in-text citations Commons category link is on Wikidata. It commences operation at tap position 2, with load supplied directly via the right hand connection.
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. 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.
In a resistance type tap changer, the changeover must be made rapidly to avoid overheating of the diverter. All of the winding taps will then be routed into the tap changer compartment through a terminal array.
Diverter resistor A is short-circuited; diverter B is unused. Solid state tap changers are typically employed only on smaller power transformers. Thyristor-assisted tap changers use thyristors to take the on load current while the main contacts change over from 6014-2 tap to the next.
In moving to tap 3, the following sequence occurs:. It is important to us that you purchase the right document. 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.
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Alternatively, in some systems, the process of tap changing may be assisted by means of a rotary or slider switch. Retrieved from ” https: The disadvantage is that these tap changers are more complex and require a low voltage power supply for the thyristor circuitry. During a tap change operation, the potential rapidly increases between the two electrodes in the bottle, and some of the energy is dissipated in an arc discharge through the bottle instead of flashing across the diverter switch contacts.
To minimize the number 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 buck and thus oppose the voltage. 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 60214-22 diverter impedance in series with the short-circuited turns.
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. 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.
Tap changer – Wikipedia
The 602144-2 voltage tap is set to match long term system profile on the high voltage network typically supply voltage averages and is rarely changed. On load tap changers may be generally classified as either mechanical, electronically assisted, or fully electronic.
If you need help with the purchase or have any queries please email enquiries standards. 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 up to 1 V — Part 2.
60214-22 tap 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 oec common for NLTC. 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.