Economical transformer type light source

Great opportunities for energy saving due to the saving of electrical energy lie in the improvement of outdoor, domestic and industrial lighting, because in this area up to 20% of all electricity produced in the world is spent. Any improvements in light sources, start-up control equipment (PRA), luminaire design, increase in the utilization rate of the luminous flux of the lighting installation lead to a significant economic effect. Particular difficulties arise with the illumination of large objects and the creation of powerful emitting devices for photochemical technologies.

This, as a rule, is associated with the low service life of powerful lamps, since all industrial gas-discharge emitters have electrodes that are intensely destroyed at high current densities. Thus, the service life of high-power gas-discharge lamps does not exceed 1000 hours, while up to 40 % of the input power is lost in the electrodes. One of the most effective ways to solve the problem of increasing the service life and efficiency of gas-discharge light sources is the transition to fundamentally new, electrodeless technologies for generating a gas discharge, which make it possible to significantly (10 times or more) increase the service life of gas-discharge lamps. In this case, due to the absence of near-electrode losses, the efficiency of gas-discharge light sources also increases.

At the Institute of Thermophysics of the SB RAS, 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 of the characteristics of these light sources were carried out.

источник света на базе трансформатора

rice. 1

The principle of operation of these lamps is similar to that of a transformer. The gas discharge is a closed toroidal plasma loop covering the magnetic circuit. Also, a system of primary windings is made on the magnetic circuit, to which an alternating voltage is supplied from a power source.In fact, the gas discharge acts as a secondary winding of the transformer (see Figure 1). 
The absence of wear parts (electrodes) allows you to remove the limitation on the power put into the lamp and significantly increase the service life of the gas-discharge lamp. Thus, the power of the experimental sample (Fig. 2) reaches 100 kW, and the service life of the developed lamps (determined only by the aging of the material of the walls of the bulb) exceeds 30,000 hours.

мощный индукционный источник света

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The principle of operation of these lamps is similar to that of a transformer. The gas discharge is a closed toroidal plasma loop covering the magnetic circuit. Also, a system of primary windings is made on the magnetic circuit, to which an alternating voltage is supplied from a power source.In fact, the gas discharge acts as a secondary winding of the transformer (see Figure 1). 
The absence of wear parts (electrodes) allows you to remove the limitation on the power put into the lamp and significantly increase the service life of the gas-discharge lamp. Thus, the power of the experimental sample (Fig. 2) reaches 100 kW, and the service life of the developed lamps (determined only by the aging of the material of the walls of the bulb) exceeds 30,000 hours.

индукционный источник света с ртутно-аргоновым наполнением 200-400ВА

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 For comparison: the most powerful lamp produced by the industry is the DKsTV 50000 xenon lamp with a power of ~ 50 kW and a service life of ~ 600 hours (used in the photochemical industry). Figure 3 shows an induction lamp with a mercury-argon filling. The power of this lamp is 200-400 watts, the service life is more than 50,000 hours, which is 10 times longer than the service life of mercury arc lamps of similar power.

индукционная лампа с неоновым наполнением 500ВА

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Figure 4 shows an experimental sample of an induction lamp with neon filling, with a power of up to 500 watts.
Currently, the IT SB RAS, together with the Novosibirsk Electrovacuum Plant, is carrying out research and development work aimed at developing various types of induction lamps: fluorescent lamps with a power of 100-200 W, low-pressure sodium lamps with a power of 200-400 W, neon and xenon gas-discharge lamps of various powers, metal halide lamps, lamps with metal vapors (zinc, cadmium). At the same time, special attention is paid to the problem of environmental safety of the lamps being developed - the problem of creating effective mercury-free light sources. Thus, the developed low-pressure sodium induction lamps with a luminous efficiency of 100-150 Lm / W are 2-3 times more efficient than "traditional" mercury DRL lamps (luminous efficiency -50 Lm / W), while the service life, due to the electrodeless principle of discharge generation, increases The developed induction gas-discharge light sources can be widely used in public utilities and various industries: illumination of streets and squares of cities, railway stations, oil rigs, quarries, application in the photochemical industry, for the disinfection of water and products by UV radiation, etc. Thus, the scope of application of induction light sources is very wide. In fact, these light sources can be successfully used in any branch of industry and utilities that use gas-discharge light sources. The use of the developed transformer-type induction lamps in the municipal economy, due to the long service life and high efficiency of these lamps, will significantly reduce the cost of lighting, replacement and disposal of used lamps. Example: Lamps DRL-400, with a power of 400 watts, currently used for street lighting, have a luminous flux of ~ 20,000 lumens, a service life of ~ 1 year. The cost of one DRL-400 lamp is ~ 150 rubles, the cost of control gear for the DRL-400 lamp is ~ 500 rubles. The power of a low-pressure sodium induction lamp with a similar luminous flux will be no more than 200 watts, the service life is ~ 7 years. The cost of one induction sodium lamp with ballast will not exceed 2000 rubles. For one year of operation, one sodium induction lamp will save electrical energy by ~ 700 rubles. Thus, after three years of operation, sodium induction lamps will fully pay off due to the saved electricity, and for the entire service life, the economic effect (in terms of 1 lamp) will be ~ 4000 rubles. In Novosibirsk, about 30 thousand lamps with DRL lamps are used for street lighting. Complete replacement of these lamps with lamps with induction sodium lamps will save about 120 million rubles within 7 years. Considering the great energy-saving effect of the application.
of the developed transformer-type induction lamps, scientists of the Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences, together with the design departments of the holding company NEVZ-SOYUZ and a number of other city enterprises, began research aimed at creating industrial induction light sources. A number of consultations were held with the leading specialists of our country in the field of lighting engineering and lighting. All participants of the consultations note the unique possibilities of the obtained method of light emission, the possibility of obtaining a whole range of lamps and lamps for various purposes. Today it is almost impossible to find a lamp (except for an incandescent lamp), in which the technologies of key structural elements would have been mastered in Russia. In our case, very great prospects open up for the creation and development of our own production of a completely new light source. Together with the development of transformer-type induction lamps, modern luminaires with electronic starting and control equipment will be developed, which will also increase the efficiency of lighting devices for street lighting. It should be noted that the lamps used for street lighting in the cities of the Russian Federation are hopelessly outdated. They lose up to 30% of the luminous flux created by gas discharge lamps. In conclusion, it should be noted that the solution of the problem associated with the improvement of lighting devices for outdoor and indoor lighting of buildings and structures will contribute to significant energy savings in every city and village.

I. M. Ulanov, Institute of Thermophysics SB RAS (IT SB RAS), V. S. Medvedko,
S. A. Sidorenko, Novosibirsk Electrovacuum Plant (HC JSC "NEVZ-SOYUZ") (article from the magazine "I am an electrician")

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