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I'm assume by VA you mean Volt-Amperes.
VA is a measurement for "Reactive Power". In simplest of ways you can think of 10 VA as 10 watts. Usually VA is used for Transformers to denote how much electrical energy is being transformed. Sometimes 10 VA of Reactive Power can take 15 or 20 watts to create, But transformers are very efficient nowadays so the 10 VA is either equal to or very close to 10 watts.
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Can a 20 VA rated transformer be used in place of a 10VA?
Yes provided the voltages are the same.
How many low voltage 20w lights can you connect to a 10Va transformer?
The low voltage needs to be stated of the 20 watt lamps.
What is the importance on transformer utilization factor?
Ulitization factor is how much of the designed total is used. My house is fed off a 50KVA transformer. It's capable of supplying 50KVA continuously, but it's probably only gets used at its' full potential every once in awhile (when my neighbors and I wake up in the morning, and when we get home from work and eat dinner, perhaps). Say it only gets used at 30KVA on average. The utilization factor would be 30/50, or 60%.
What is High frequency transformer?
High frequency power transformer as a product (ie goods) starting, that its design principles and requirements, and describes its design process. Keywords: High frequency power transformer; design principles; located Abstract: The high-frequency power transformer as a product (ie goods) starting, that its design principles and requirements, and describes its design process. Keywords: High frequency power transformer; design principles; design requirements; design process features a foreword power transformer is the power transfer, voltage transformation and isolation isolation, as a major soft magnetic components, power supply and power electronics technology been widely used. Transmission power according to the size, power transformers can be divided into several files: 10kVA or more for the power, 10kVA ~ 0.5kVA is in power, 0.5kVA ~ 25VA for the low-power, 25VA Following is a micro-power. Different transmission power, the power transformer design are not the same, should be self-evident. It was based on its primary function is the power transfer, the English name "Power Transformers" into "power transformer", in many documents and data are still in use. What is called "power transformer" or called "power transformer" is good? Science and technology terminology to be authority to select the decision. With an English name "Power Transformer", also translated as "power transformer." Power transformers used for power transmission and distribution system from the power transmission, voltage transformation and isolation insulating effect than the primary voltage is 6kV high-voltage, power minimum 5kVA, the largest over the million kVA. Power transformers and power transformers, although the working principle is based on the principle of electromagnetic induction, but both stressed the power transmission transformer big, but also stressed the high isolation voltage insulation, both in the **** coil, or the insulation structure design, with the power to send small , insulation and low voltage power transformer isolated significant differences, but can not be designed to optimize the design of power transformer condition mechanically applied to the power transformer to go. Power transformers and power transformer design method is not the same, it should be self-evident. High frequency power transformer is the operating frequency over frequency (10kHz) power transformers, high frequency switching power supply is mainly used for high frequency switching power transformers, but also for high-frequency and high frequency inverter power supply for high-frequency inverter welding machine inverter transformer. According to the level of the operating frequency can be divided into several grades: 10kHz ~ 50kHz, 50kHz ~ 100kHz, 100kHz ~ 500kHz, 500kHz ~ 1MHz, 1MHz or more. Larger transmission power, the operating frequency is relatively low; transmission power is relatively small, the operating frequency is relatively high. Thus, both the frequency difference, there are differences in transmission power, frequency of different grades of power transformer design is different, it should be self-evident. As noted above, of the high-frequency power transformer design principles, requirements and procedures are error concept, but in early July 2003, read "Application of Power" 2003 No. 6 specifically recommend two high-frequency magnetic components Design article, had doubts and felt some issues worthy of further discussion, it was to write this article. As the "power technology," Editorial put it: "concrete analysis of concrete situations," the purpose of writing is to try to detail and selection of the most difficult component of the magnetic high-frequency power transformer design to clarify . The place where it is wrong, please correct me by several authors and readers. 2 high-frequency power transformer high frequency power transformer design principles as a product of natural products with the properties, so high-frequency power transformer design principles and other commodities, is done under the specific conditions of use in the pursuit of specific performance of the functions price than the best. Emphasis on performance and efficiency may sometimes, sometimes emphasis on price and cost. Now, light, thin, short and small, to become the development direction of high frequency power supply is that of cost. Which became a major difficulty of the high-frequency power transformers, but more efforts in this regard. Therefore, high-frequency power transformer "design features" a text, talk about performance, not talk about the cost, can not be said to be a major shortcoming, if you will seriously consider the principle of high-frequency power transformer design, the pursuit of better performance and low cost to send less than 10VA the chip switching power supply high frequency transformers, should be designed lighter, thin, short, small programs. Cost aside, the market value of the law is merciless! Many properties of a good product, often because the price can not be accepted by the market who were left out and eliminated. Often the cost of a new product was finally rejected. Some "saving money is not festival" products why not open the market to promote worth pondering. Product cost, including not only material costs, production costs, including research and development costs, design costs. Therefore, in order to save time, based on past experience, high-frequency power transformer iron loss ratio of copper losses, leakage inductance and magnetizing inductance ratio, primary and secondary winding loss ratio, the current density to provide some reference data, the extent of the window fill winding wires and structure to some of the programs, what is wrong? Why must progressively projected back and forth and simulation, it is not the concept of error? Of 80 years in the 20th century to develop high-frequency magnetic amplifier switching power supply to the lowest temperature conditions, optimized high-frequency power transformer design. Difficult to determine the thermal resistance, a far cry from the sample results and trial had again amended. Now some of the company's **** product specifications in order to reduce the user time high-frequency power transformer, and some simplified design formulas are listed, some with the table lists the **** operating frequency in a certain transmission power. This not only for the sake of users, but also to promote the company's products win-win behavior is entirely consistent with the behavior of market rules, not what is needed misconceptions Analysis. The problem is to provide reference data, the recommended solution is a summary of experience? There is no universal? Including the "Analysis" article to some of the claims, we need proven to hold water. In short, do keep in mind: high-frequency power transformer is a product (ie, commodities), the design principle is to be completed under the specific conditions of use of specific functions in the pursuit of best price performance. The sole criterion for testing the design is to design products that can withstand the test of the market. 3 high-frequency power transformer design requirements to design principles as a starting point, you can make four high-frequency power transformer design requirements: Conditions, completion, improve efficiency and reduce costs. 3.1 Conditions of Use Conditions of Use, including two aspects: reliability and electromagnetic compatibility. Previously only pay attention to reliability, since the increased awareness of environmental protection, must pay attention to electromagnetic compatibility. Reliability refers to the specific conditions of use, high-frequency power transformer can work to life so far. General Conditions of Use of High Frequency Power Transformer is the biggest environmental temperature. Some soft magnetic materials, relatively low Curie point, temperature sensitive. For example: Mn-Zn ferrite, the Curie point only 215 ? the magnetic flux density, permeability and loss changes with the temperature, so the addition to the normal temperature of 25 ? but also gives the 60 ? 80 ? 100 ? a variety of reference data. Therefore, Mn-Zn ferrite **** of the operating temperature limits below 100 ? which is the ambient temperature is 40 ? the temperature rise of only less than 60 ? the equivalent of A-temperature insulating materials. Mn-Zn ferrite cores with the matching pieces of magnet wire and insulation, are generally used E-class and B class insulation material, the use of triple H class insulation magnet wire and polyamide insulating film, is not overkill? Costs how much? H class insulation is not because of the high-frequency power transformer design optimization can make the volume reduced by 1 / 2 to 1 / 3 the reason? If yes, please give specific examples of data. Development of the H class insulation has frequency 50Hz, 10kVA dry-type transformers, and insulation class B frequency 50Hz, 10kVA dry-type transformers compared to volume decreased 15% to 20%, is already quite substantial. Have been relatively small volume of high-frequency 100kHz10VA high frequency power transformers, such as the secondary windings are triple insulated wire, can reduce the size of 1 / 2 to 1 / 3, it must be a very valuable experience. Detailed information about optimal design of programs for readers to learn.
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