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Articles on transformer topics

  • Power transformers. From the practice of repair and design   - It would seem that everything, or almost everything, has already been said about network transformers. However, in the practice of repair and design, there are very interesting and extraordinary situations, in terms of practical application, on which you should pause in order to consider them more closely.
  • Power transformers - healthy recipes - All the variety of today's household radio equipment has one common, unifying element - ...
  • The simplest autotransformer - design features - It is usually necessary to provide for the ability to regulate the voltage on the load when the mains voltage changes. If…
  • Transformers-terms and definitions - Stable and reliable operation of both individual nodes and cascades and the entire equipment as a whole depends on the correct choice and application of transformers. Transformers have a significant impact on the main electrical parameters of equipment and devices, the reliability and durability of devices, as well as on performance under conditions of exposure to elevated temperatures and other climatic factors.
  • Current transformers -In modern conditions, in connection with the renewal of equipment, which is outdated not only morally, but also physically, there is an active replacement of old current transformers with new ones that meet modern requirements. And if for a voltage of 10 kV the cost of a current transformer is not decisive when carrying out reconstruction, then with an increase in the voltage class the picture changes ....
  • Transformers-repair practice - The craft of making transformers is an unbearable, depressing routine for a creative person. Almost any transformer can be replaced with others of a similar design. An abundant experience of such substitutions has been accumulated by the practitioners of the teleceremony. Before replacing a failed transformer, you need to make sure of its complete failure and, if possible, clarify the reason for the failure.
  • Using low voltage lighting - advantages and disadvantages of using low-voltage lighting in the design and construction of lighting systems
  • Operation of power transformers, highlights  - the operating time of a power transformer directly depends on its operating mode and service conditions.
  • Current transformers - basic concepts of current transformers, basic classification.
  • Classification and principle of operation of current transformers - the article provides the main classification of current transformers, as well as a schematic diagram of a current transformer and a method for calculating them
  • TAN power transformers - all data for the selection and calculation of transformers of the TAN type are given
  • The transformer detects a short circuit - Electricians who operate high-voltage cable networks have a lot of trouble with earth faults in individual conductors. They now have a simple device at their disposal.
  • Power transformers type TN-the type of power transformers used in electronic equipment, they, like TA and TAN transformers, are connected to an alternating current network with a frequency of 50Hz and a voltage of 127V or 220V since it was assumed that they would be used for filament circuits of radio tubes, the secondary windings of these transformers provide voltages of only 6 , 3 / 5V
  • Toroidal transformer device and design - toroidal transformer has an ideal design, unlike other transformers. In fact, the first transformer designed by Faraday was
  • Power transformer type TA - the presence of several secondary windings on the transformer, designed for different currents and voltages, and the possibility of their serial and parallel connection, make it possible to obtain different combinations of currents and voltages at the transformer output. The presence of additional taps in the primary winding makes it possible to accurately take into account the features of the supply network.
  • Welding transformers purpose and classification - a classification diagram of the main types of welding transformers used in modern contact machines is presented, depending on the method of their power supply. According to this scheme, all welding transformers are divided into two main groups: transformers that convert electrical energy of alternating current with a frequency of 50 Hz, consumed from the network directly during welding, and transformers, ...
  • Transformers, chokes, inductors - from all the variety of magnetic materials, we will focus on soft magnetic ferrites, because they are capable of operating in a wide frequency range ...
  • Unified universal power transformers (UUTP) - are intended for power supply of electronic equipment of wide use from an industrial AC network with a voltage of 220 V and a frequency of 50 Hz. Only one transformer of the T5 series is designed to be connected to both 127 and 220 V.
  • Low voltage power transformers - single-phase low-voltage power transformers of TP8 type - climatic version, with a supply voltage of 220V with a nominal frequency of 50 Hz and a supply voltage of 115/220 V with a nominal frequency of 400 Hz are intended for operation in power supplies of radio electronic equipment. The design of the transformers is shown ...
  • Signal matching transformers - represent a fairly large group of low-power signal transformers designed to perform certain functions in the electrical circuits of blocks, assemblies, instruments and devices of electronic equipment. This group of transformers includes: matching signal transformers of continuous signals, pulse matching signal transformers, broadband matching signal transformers ..
  • Transformers for switching power supplies - various types of transformers for switching power supplies are widely used. Switching network units and power supply modules for household and office equipment connected to the AC network are used to obtain DC voltages necessary to power all functional units of the electronic equipment
  • Power transformers type TPI- are used in pulsed power supply devices for household and office equipment with intermediate conversion of the supply voltage of 127 or 220 V at a frequency of 50 Hz into rectangular pulses with a repetition rate of up to 30 kHz, made in the form of modules or power supplies: BP, MP-1, MP -2, MP-Z, MP-403, etc.
  • Transformers of the TP type with a power supply frequency of 1000 Hz - Small-sized low-voltage power transformers of the TP type are designed to operate in a moderately cold climate at an ambient temperature of -60 ... + 85 ° С and relative air humidity up to 98% at a temperature of + 40 ° С. Transformers of the TP type are used in power supply devices REA, ACC and devices for powering functional units and blocks manufactured on PPP and microcircuits using printed wiring circuits.
  • Boost autotransformer - A step regulator based on the TC-200 transformer provides regulation of the mains voltage, similar to the functions of an autotransformer. Here the mains voltage goes to the load, as an additive to which the voltage from the secondary winding of the transformer, connected in series with the mains wires, is used.
  • Selection of group and connection diagram of transformer windings - The group of connecting windings of power transformers is chosen so that the transformers meet the following conditions as much as possible: prevent the occurrence of higher harmonics in electrical networks, equalize the load between the phases of the primary winding with an asymmetric load of the secondary winding
  • Selection of power transformers - By design, transformers are divided into oil, filled with synthetic fluids and dry / 3 /. The first of them have good heat dissipation from the windings and core, good dielectric impregnation of insulation, reliable protection of active parts from environmental influences, ..
  • Classification of transformers - Small-sized transformers used in household and office electronic equipment. are classified according to the following main features: according to the conditions of use and operation, taking into account the requirements for resistance to external influencing factors; according to the functional purpose, which is determined by the types of electronic equipment ...
  • Transformers and Chokes for Switching Power Supplies - the article gives an answer to the question of calculating transformers and inductors, including chokes. Readers will be able to use this information to check and change the parameters of the CI when repeating and repairing radio amateur or industrial structures.
  • Pulse transformer test methods - pulse transformers of power supplies and line scanners fail most often due to overheating of the windings. Most often this happens in small-sized transformers wound with a thin wire, simple reliable methods of testing pulse transformers in a mode close to operating are offered ...
  • Transformers for converting installations - the article provides the characteristics of transformers for converting installations. The device of power converting transformers is described
  • Phasing of transformer windings - It is well known that the phase of the voltage at the outputs of the choke and the phase of the current through its winding are spaced in time by a quarter of a period (zero voltage coincides with the maximum current and vice versa) - the inductive element "turns the phase". In a transformer, everything is different. Although the operation of a transformer is based on the law of electromagnetic induction, with respect to the phases of the signals, everything is different here.
  • Industrial furnace transformers - Electric transformers (EPT) are part of electrothermal installations (ETU) - installations of electric furnaces and electric heating devices used to obtain ferrous, non-ferrous and rare metals and their alloys with specified properties, as well as ore-smelting furnaces. Features of operation, modes and technical requirements distinguish EPT in a separate class of power transformers ...
  • Power supply autotransformers for a frequency of 50 Hz - the difference between an autotransformer (AT) and a transformer is that the AT has only one winding, which is both a primary and a secondary circuit. This is an AT with one tap. It is possible to manufacture AT with several taps, both for changing U1 and for changing Un. The AT design is exactly the same.
    The principle of operation of the AT practically does not differ from the principle of operation of the transformer. Consider the work of AT ...
  • Incandescent halogen lamps. main parameters - All about halogen lamps - technical parameters, connection methods, characteristics.transformers for connecting halogen lamps ...
  • Transformer condition monitoring - Any power transformer has been in operation for years (cases of operation of a transformer for 40 years or more are known) in a variety of modes and under different external influences. This diversity cannot be represented analytically. Some kind of system for assessing the condition of the transformer, organized in the enterprise, is needed.
  • Autotransformers - the article gives a comparative analysis of a two-winding transformer and an autotransformer, the purpose of the autotransformer, methods of calculation and selection, voltage regulation circuits in the autotransformer.
  • Spot welding device - the article gives an idea of the structural arrangement of a spot welder, the most suitable device for automatic and semi-automatic welding of small metal parts. The main component of spot welding is a power welding transformer, recommendations for its selection and calculation are given. 
    Surge Protectors - describes the general method for selecting voltage stabilizers, their main purpose, taking into account correction factors when selecting power. The characteristics of the stabilizer protection systems are given. The influence of the speed of the stabilizer on the speed of voltage regulation.
  • Dry power transformers - Power transformers are one of the most important elements of electrical networks and electrical installations. Earlier, up to the last third of the last century, power oil transformers were exclusively used in power grids. However, over the past 40 years, dry power transformers have become more and more widely used instead of them, which is one of the ...
  • Wires for transformer windings- For the manufacture of transformers and chokes, special winding wires are used. Copper enameled wires with insulation based on oil varnishes (PEL) are produced with a core diameter of 0.002 ... 2.5 mm. Such wires have high electrical insulating characteristics, which practically do not depend on the external influence of high temperatures and humidity. Enameled wires with PET-155 ...
  • Welding machine from two transformers- The proposed design is intended for direct current welding and is made of two chokes with transformer iron USh40x80. The total cross-section of the core is 64 cm2, which is quite enough for a welding transformer. The design uses standard coil frames and fasteners without alteration, which minimized the use of additional materials and labor costs for manufacturing.
  • Economical transformer type light source - On the basis of studies of low-frequency (10 kHz) induction discharges of the "transformer type", experimental samples of induction electrodeless gas-discharge lamps of various powers - from 100 W to 100 kW were developed and created, experimental studies were carried out characteristics of these light sources.
  • Mains voltage normalizer. Principles of construction-The article describes a general approach to building an inexpensive AC voltage normalizer based on an autotransformer with 4 taps, switched by triac switches.
    A method of decreasing the switching step using phase voltage boost without changing the structure of the device is considered.
  • Test for knowledge of the device and the principle of operation of the transformer - an interesting test to test the theory of transformers from the school course 
  • The stability of the electrical system can be described as "power quality". The first step to assessing the health of an electrical system is collecting data from equipment, infrastructure, and a service panel. The stability of the electrical system can be described as "power quality". The first step to assessing the health of an electrical system is collecting data from equipment, infrastructure, and a service panel.

 

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