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.
|Published (Last):||12 December 2012|
|PDF File Size:||1.24 Mb|
|ePub File Size:||18.39 Mb|
|Price:||Free* [*Free Regsitration Required]|
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. 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.
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.
Solid state tap changers are typically employed only on smaller power transformers. 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.
This article includes a list of referencesbut its sources remain unclear because it 62014-2 insufficient inline citations.
Tap changer – Wikipedia
This technique overcomes the problems with open or short circuit taps. This page was last edited on 15 Septemberat They are often more costly but this method is used in some modern transformers. September Learn how and when to remove this template message. 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.
In other projects Wikimedia Commons. Views Read Edit View history. This power 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. 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 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. From Wikipedia, the free encyclopedia. Application guide This document has been re-assessed by the committee, and judged to still be up to date. A tap changer is a mechanism in transformers which allows for variable turn ratios to be selected in discrete steps. It is important to us that you purchase the right document.
Diverter resistor A is short-circuited; diverter B is unused. 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.
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 type of transformer is frequently employed in low power, low voltage transformers in which the tap point often may take the form of a transformer connection terminal, requiring the input line to be disconnected by hand and connected to the new terminal.
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.
We recommend that you check the website of the publishers of the international document before making a purchase. Alternatively, in some systems, the process of tap changing may be assisted by means of a rotary or slider switch.
In moving to tap 3, the following sequence occurs:. 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.
Some arcing is unavoidable, and both the tap changer oil and the switch contacts will slowly deteriorate with use. However, a transformer may include a tap changer on each winding if there are advantages to do so. Please help to improve this article by introducing more precise citations.
In a resistance type tap changer, the changeover must be 60214-22 rapidly to avoid overheating of the diverter. This prevents arcing on the main contacts and can lead to a longer service life between 6021-42 activities.
If you need help with the purchase or have any queries please email enquiries standards. It commences operation at tap position 2, with load supplied directly via the right hand 602214-2.
Particular requirements and tests for switch mode power supply units and transformers for switch mode You may be interested in this related standard. 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.
No load tap changers are also employed 602214-2 high voltage distribution-type transformers in which the system includes a no load tap changer on the primary winding to accommodate transmission system variations within a narrow band around 6024-2 nominal rating. Retrieved lec ” https: To prevent contamination of the tank oil and facilitate maintenance operations, the diverter switch usually operates in a separate compartment from the main transformer tank, and often the tap selector switches will be located in the compartment as well.
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. The 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 more common for NLTC.