Начало
→
TECHNICAL UNIVERSITY - SOFIA
→
Proceedings of the Technical university of Sofia, 1995 -
→
Последно депозирани

Proceedings of the Technical university of Sofia, 1995 -: Последно депозирани

Показване на публикации 561-580 от 853

Заглавие: Повишаване точността при определяне на електрическите характеристики на електродъгови пещи Автор: Господинов, Васил Спасов Дата: 1995 Резюме: To increase the accuracy when defining the electrical characteristics one must known actual values of the reactance of electric circuit of electrical arc furnaces. The suitable model of defining inductive reactance will be dissented in the article. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Оптимално отношение между активната и конструктивната маса в някои електромагнитни уреди Автор: Русев, Димитър Симеонов; Rusev, Dimitar Simeonov Дата: 1995 Резюме: In this paper the influence of the active mass (moveable ferromagnetic element) on the torque of electromagnetic measurement instruments with round coil and light opening is discussed. On this base the optimal relationship between active and constructive mass, providing maximum coefficient of mechanical quality factor is determined for various instruments. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Метод на частичния разряд и приложението му при изпитване на нисковолтови електрически устройства Автор: Колев, Николай Петков; Манолов, Емил Христов; Kolev, Nikolai Petkov; Manov, Emil Hristov Дата: 1995 Резюме: The application of partial discharge for testing of low-voltage equipment (up to 1000 has significantly grown in the last year. In this paper the basic theoretical statements and measurement structures for partial discharge testing are discussed. The possibilities fin-designing of intelligent measurement systems that simplify the processing ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Възстановяващи се напрежения на прекъсвачи 35kV при комутиране на шунтови реактори Автор: Колев, Валентин Генов; Kolev, Valentin Genov Дата: 1995 Резюме: Calculation of recovery voltage is made in correction with posibility of adding of a vacuum surge breacker type VCI 1-36/25/1250 of company Holec. A tree phase model was investigated using the method of state varyables in the process of switching off of a shunt reactor. A special software is designed for calqulating the transient processes ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Статистически характеристики на хармоничните съставки на тока на газоразрядни светлинни източници Автор: Сидеров, Сидер Тонев; Диканаров, Георги Иванов; Dikanarov, Georgi Ivanov; Siderov, Sider Tonev Дата: 1995 Резюме: The report treats the results of the experimental research on the harmonic components of the electric current of the different types discharge light sources, applied in different circuits. The probability-statistical components of the current are defined. The obtained results alow to carry out an analysis of the nonsinuous regimes of the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изследване на пулсациите на потока на източниците на светлина Автор: Диканаров, Георги Иванов; Пачаманов, Ангел Саракинов; Dikanarov, Georgi Ivanov; Pachamanov, Angel Sirakov Дата: 1995 Резюме: The report treats the results of the research on the pulsations of the radiant flux of a broad scale of lighting sources and the most widely distributed nowadays huninaries with fluorescent lamps, produced in the country or imported by leading companies. The experimental circuits for carrying out the measurements, the methods of research ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Анализ на честотната зависимост на tgδ за оценка на стареенето на кабелна изолация Автор: Тодорова, Антоанета Константинова; Дюстабанов, Георги Иванов; Todorova, Antoaneta Konstantinova; Dustabanov, Georgi Ivanov Дата: 1995 Резюме: A method for valuation of the change in the state of compounded insulation in the process of its ageing is proposed. The ageing degree is observed by periodically measuring of frequency dependancy of tgδ and by calculating the quantity... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изследване на електромагнитното поле в двуслойни плоски среди, възбудено от стрикциомагнитен преобразувател със сложна форма Автор: Гунински, Стефчо Георгиев; Guninski, Stefcho Georgiev; Цанов, Димчо Димитров; Tsanov, Dimcho Dimitrov Дата: 1995 Резюме: In this paper the magnetic vector-potential is analitically determinated and thus the magnetic field in the system "magnetoelastic transducer with complex shape (with jive poles)-ferromagnetic conductive two-layer plane object" is calculated. The obtained results allow its to make various optimization investigations of magnetoelastic, ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изчислителен метод за определяне на параметрите на асинхронна машина Автор: Илиев, Тотьо Илиев; Iliev, Totyo Iliev Дата: 1995 Резюме: The paper offers a new method of approach for determination of asynchronous electric motors There are offered relationships and approximative expressions, determining parameters depending on power of the electric motor, which may be used or projecting electric motors of definite class. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Механични характеристики на мощни асинхронни двигатели Автор: Тодоров, Георти Тодоров; Todorov, Georgi Todorov Дата: 1995 Резюме: The rotor winding parameter's variation is described taking into account the skin effect and unsteady heating in height of the rotor bar at starting. Its effect on the tomtit,- slip characteristics is analysed at a different duration of starting. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Определяне на средногодишния разход на електроенергия на подемно-транспортни механизми с циклично действие Автор: Йорданов, Светослав; Yordanov, Svetoslav; Кутрянски, Крум; Kutryanski, Krum Дата: 1995 Резюме: The application of technical-economical criterion for choose and selling-up of electric drive system needs finding of average annual energy consumption for compared variants and parameters of systems. This problem is very difficult for cyclic duty mechanisms because of the necessity of accounting the laws of probability distribution of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изчисляване на механичните характеристики на асинхронен двигател в режим на кондензаторно спиране Автор: Райнов, Румен Иванов; Raynov, Rumen Ivanov Дата: 1995 Резюме: A method for computing of mechanical characteristics of an asynchronous motor operating of condenser stoppage mode is proposed. The essential influence of the magnetization curve over the form of mechanical characteristic by is shown. The method allows to examine the particular parts of the mechanical characteristics at the beginning and ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Определяне на номиналните параметри на асинхронни двигатели по табелните им данни Автор: Йорданов, Светослав; Райнов, Румен Дата: 1995 Резюме: A method for determination of the equivalent circuit parameters of induction motors, based on the name plates data and using of the statistic relations is propoused. Evaluations of the maximal and the average errors are represented. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Противобоксуващи схеми за токоизправителни електрически транспортни средства Автор: Българанов, Любомир Борисов; Balgaranov, Lyubomir Borisov Дата: 1995 Резюме: The realised adhesion coefficient is influensed very much by the way of collecting the tractive motors, by the way of their control as well as by the existence and the character of the protection against sliping.In this article are suggested and analised some schemes against sliping for alternative current rolling stock. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Към определянето на вероятността за безотказна работа в заден интервал от време в условията на стационарен процес с моментално възстановяване Автор: Цочев, Христо Цветанов; Tschev, Hristo Tsvetanov Дата: 1995 Резюме: The determination of the steady-state probability R+(h) of no failure on the interval (t, t +11) in conditions of renewal process is considered as a problem of designing. A formula for calculation the probability R+(h) in a case of simplified presentation the relationship between the failure rate X and time t is proposed. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Експериментално определяне на динамичните характеристики на електромеханични измервателни уреди Автор: Маджарова, Мария Димитрова; Madjarova, Marija Dimitrova Дата: 1995 Резюме: The amplitude — frequency characteristic of a permanent-magnet moving - coil (PrifIliC) instrument has been experimentally obtained. The prelimenary frequency response characteristic has been determined through the approximation of the logarithmic amplitude —frequency curve. The both performances: Theoretical and experimental, has been ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Върху инвариантността на определителните изрази при различните състояния на променливотоковите измервателни мостове Автор: Ставракев, Желязко Анастасов; Иванов, Иван Николаев; Туренков, Васил Николаев; Stavrakev, Zhelyazko Anastasov; Ivanov, Ivan Nikolaev; Turenkov, Vasil Nikolaev Дата: 1995 Резюме: In the article, it is shown, that for every equilibrated or quasiequilibrated state for a given type of four branches bridge, the determinated expression of the unknown parameter, which can be measured, is the same. It is shown as well, that if one of quasiequili-brated states is possible (amplitude, zero-phase, square phase) the same ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Теорема за съществуването на ефективен коефициент на усилване на веригата на правото предаване Автор: Станчев, Иван Борисов; Stanchev, Ivan Borisov Дата: 1995 Резюме: A theorem, according to which the three, transmission circuit of each amplifier with negative feedback is characterized by a coefficient of transmission, named efficacious gain. This coefficient according to the theorem is deffinited as multiplication of the gain's own of the electronic amplifiers and the coefficient of transmission of the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Възможности за намаляване на грешките от входните токове на операционните измервателни усилватели Автор: Станчев, Иван Борисов; Куртев, Иван Александров; Иванов, Иван Николаев; Stanchev, Ivan Alexandrov; Kurtev, Ivan Alexandrov; Ivanov, Ivan Nikolaev Дата: 1995 Резюме: Possibilities to decrease the input current errors at some circuits of measurement amplifiers are examined. First a method is suggested for compensation of the voltage drop, which appears in math-wig precise tension divider placed at the input of the amplifier. At the second for-the inverting amplifier with variable gain an .optimal value ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Transient processes in three-phase three-winding autotransformers after switching on at open-circuit conditions Автор: Tagarov, Kiril D.; Тагаров, Кирил Д. Дата: 1995 Резюме: One of the most difficult problems by the computation of electromagnetic tran-sients in power autotransformers is, that in most cases some of the necessary data for the transformer paranzetres are not available. In this paper is proposed a method to complete those data that are needed for the computation of electromagnetic transients but ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA

Показване на публикации 561-580 от 853

Търсене в репозиториума

Разширено търсене

Преглед

В целия репозиториум
Тази колекция

Мой профил