Nanjing Maodian Control Technology Research Institute (210007)
Abstract: This paper puts forward the selection principle of street lamp power saver from the perspective of street lamp power saving and extending lamp life and reducing maintenance workload. It also shows that for high-intensity gas discharge lamp energy-saving equipment, the current when voltage regulation should be proposed from the standard. Intermittent, inrush current, transient over-voltage or voltage drop, etc., which affect the life of the lamp, these indicators are in line with the actual requirements of energy-saving products for high-intensity discharge lamps, and can be relaxed for insignificant indicators.
Key words: street lamp power standard products
The European IEC 555-2 standard (subsequently replaced by EN61000-3-2) is the first to make clear requirements for the input harmonic current of electrical equipment, thus promoting the research and progress of global PFC technology. Street lamp energy saving, standard first, is very necessary. In fact, street lamp energy-saving products are far ahead of the standard, and some products that are not compatible with the industry characteristics have caused a lot of unnecessary losses and waste.
LED street lights have many advantages, of course, there are also shortcomings. At present, the use of LED street lights is also very high, but according to the latest report of China Energy Information Network [6] , polysilicon used in solar photovoltaic power generation is a high-energy, high-pollution product. [7] At the same time, some people believe that the power regeneration ratio of solar power generation systems is too low. The application of solar street lamps is essentially a waste of energy, and solar street lamps should not be promoted [8] . In this paper, we do not make in-depth analysis of LED street lamps. Below we talk about the power saving of street lamps such as high-intensity discharge lamps and the impact on the life of lamps.
For the choice of street light single-lamp power saver, we recommend the electronic ballast with the best quality pass for energy saving and extending the life of the lamp.
For the selection of centralized streetlight saver, we believe that from the perspective of system engineering, we should adhere to the following three principles: First, the life of the lamp is extended rather than reduced, second, it will not damage the street light transformer, and third, the power saver product itself. High reliability, no additional maintenance work is required. Based on these three principles, in the current centralized street lighting power saver, we first recommend the use of non-contact electromagnetic voltage regulator products and high-frequency switching power supply voltage regulation products, the precondition for using these two types of products is Their technology must be cleared, that is to say, in the process of voltage regulation, there is no overvoltage or voltage drop, and the current is continuous and without impact. For products with simple voltage regulation and non-contact electromagnetic voltage regulation, we have several years of practical experience. When the mains voltage is high, its highest step-down voltage is 4×12V (we do not recommend using such a high file). The bit voltage) does not cause the lamp to be extinguished, and can really extend the life of the lamp and reduce the maintenance workload. For high-frequency switching power supply voltage regulation products, it is only recommended according to theoretical analysis and individual manufacturers' propaganda. By the way, for streetlight saver, one-sided pursuit of power saving rate is not advisable.
Also known as contactless voltage regulation or voltage regulation, the performance of products designed or produced varies greatly depending on the level of technology. Some non-contact voltage regulation technologies have not been completely cleared. When the gear position is switched, overvoltage or voltage drop, current interruption or current surge may occur, which may adversely affect the load or the electrical appliances around the regulator. These products usually use current-limiting components such as resistors, inductors, and high-leakage transformers in the electrical circuit, or use long-term (near milliseconds) discontinuities in gear shifting.
For equipment that does not have strict requirements for current interruption or products with a rectifying device at the front end of the computer, the mains supply is interrupted for 10 milliseconds or instantaneously, and has no effect on the work. However, for high-intensity gas discharge lamps of sodium lamps, there are millisecond currents. Intermittent can cause arc instability or even extinction. Immediately after the extinction, re-triggering in the hot state will affect the life of the lamp. This is the main reason why some street lighting departments say that “the life of the lamp will be shortened after using the power saverâ€. If an overvoltage occurs during voltage regulation or the voltage drops significantly, the lamp will be extinguished and restarted, which will affect the life of the sodium lamp. This is based on the technical articles and the conclusions of our extensive experiments.
Regarding the non-contact electromagnetic voltage regulation technology and street lamp energy-saving technology, the discussion of experts on the Century Power Network has come to an end [4] , which has been fully affirmed and highly praised by relevant scientists and inventors in the National Science and Technology Achievements Network Forum. As the first "recommendation of signature responsibility" [9] , you can also view more detailed information on the website of Nanjing Institute of Control Technology [10] (including news content, technical debate summary, test waveform pictures and videos, etc.) ). For the breakthrough of the non-contact electromagnetic voltage regulation technology, the incorrect conclusions of the high-pressure sodium lamp experiment which is not related to the original technology can be corrected to some extent.