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    15 2020-09

    Comparison of toroidal transformer, square transformer and switching power supply

    There are several types of transformers. The types of small transformers include toroidal transformers, square transformers and switching power supplies. I believe that many customers are troubled by how to choose these types of transformers. Shengyuan Transformer has in-depth research in the field of toroidal transformers and waterproof transformers. Today, guided by professional technical engineers, the editor will describe them one by one for everyone. Toroidal transformer Toroidal transformer A, efficiency 50W The operating efficiency of the toroidal transformer is 86%-90%, while the operating efficiency of the 50W square transformer is 80-84%. The working efficiency of 400W toroidal transformer is 90-93%,...
    15 2020-09

    Analysis of common faults of transformers and their solutions

    Transformer failure situation When the staff on duty at the transformer substation finds an abnormal phenomenon in the operation of the transformer, they should try to eliminate it as soon as possible, and immediately report to the superior and make a record. When a serious fault of the transformer is found, the transformer should be shut down without reporting to the dispatcher. If there is a spare transformer in operation, put it into operation as soon as possible, and then report to the dispatch and leadership. Such as: 1. The sound of the transformer is obviously increased, which is very abnormal, and there is a popping sound inside. 2. Severe oil leakage or fuel injection causes the oil level to drop below the design limit of the oil level. 3. The casing has serious damage and discharge. 4. The transformer is smoking and catching fire. transformer...
    15 2020-09

    Anti-theft measures for base station transformers

    In recent years, with the rapid development of mobile communication networks, the amount of base station construction has been much higher than before, and remote independent base stations have repeatedly become the site of choice for criminals to commit theft. We further clarified the anti-theft ideas through the analysis of stolen base stations. From the analysis of the geographical location of the stolen sites, all the stolen sites are remote and independent base stations, which are usually unattended; from the analysis of the time of the theft, most of the cases occurred in the early morning of the night; from the analysis of the stolen components, all were transformer copper cores It was taken away without any anti-theft measures. From the above analysis, the professional maintenance staff of our company prescribe the right medicine and adopt the following scheme: ...
    15 2020-09

    Why is the sound loud when the transformer is no-load?

    Why is the sound louder at no load than at full load? It is because there is no load on the second time at no load, which causes the primary voltage to be slightly higher. Generally, the rated voltage is 10kV, and the actual voltage may be about 10.5kV at no load; the core magnetic density is due to the voltage increase High, larger than the normal design value. B=45*et/S (et is the design turn potential, the number of turns does not change, the no-load voltage increases, so that et increases, causing B to increase); the iron core magnetic density is high, which leads to The large hysteresis vibration of the iron core causes the sound to be louder at no-load; this is the main factor! (The effect is that the no-load current increases) The no-load current is a secondary cause, and the large no-load current reflects... .
    15 2020-09

    Anti-theft measures for base station transformers

    In recent years, with the rapid development of mobile communication networks, the amount of base station construction has been much higher than before, and remote independent base stations have repeatedly become the site of choice for criminals to commit theft. We further clarified the anti-theft ideas through the analysis of stolen base stations. From the analysis of the geographical location of the stolen sites, all the stolen sites are remote and independent base stations, which are usually unattended; from the analysis of the time of the theft, most of the cases occurred in the early morning of the night; from the analysis of the stolen components, all were transformer copper cores It was taken away without any anti-theft measures. From the above analysis, the professional maintenance staff of our company prescribe the right medicine and adopt the following scheme: ...
    15 2020-09

    Common faults of transformers and fault analysis

    1 Common faults of transformers During power transmission and operation, common faults and abnormal phenomena are as follows:    (1) When the transformer is powered off after outage or trial transmission, it is often found that the voltage is abnormal, such as two phases and one phase higher. Low or the indication is zero; some newly commissioned transformers have high three-phase voltages, causing some electrical equipment to be burned due to excessive voltage;    (2) high-voltage fuse is blown and cannot be powered on;    (3) transformer cannot be delivered after a thunderstorm Power on;    (4) The transformer sounds abnormal, such as "squeaking" or "cracking"; during operation, it makes a "squeaky" or "crack" sound;    (5) high...
    15 2020-09

    Analysis on High Voltage Test Technology of Power Transformer

    In recent years, with the continuous improvement of my country's economic and technological level and the rapid development of social development, my country's power input and power demand have also continued to increase. As the most commonly used electrical equipment in the power system, power transformers are one of the main equipment in substations and power plants, and are essential for power generation, power supply and electricity consumption. High voltage test on power transformer is an important means to ensure the safe operation of transformers. Taking the working principle of power transformers as the starting point, research and explore the test conditions, test methods and test contents of high-voltage test technology for power transformers, analyze its feasibility, and how to be safe and effective...
    15 2020-09

    Transformer core and rare earth

    According to sources, electronic transformer cores mainly use soft magnetic materials, while rare earths have relatively few applications in soft magnetics. However, rare earths are very important for the innovation and development of transformer cores. For example, the iron core material of the so-called rare earth transformer is made of silicon steel sheet containing rare earth material. This kind of magnetic core has better magnetic permeability and lower magnetic loss. The main components of ferrite also include iron oxide and rare earth element oxides. Ferrite magnetic materials can be divided into spinel type (MFe2O4); garnet type (R3Fe5O12); magnetoplumbite type (MFe12O19); perovskite type (MFeO3)...
    15 2020-09

    Introduction to transformer protection

    Transformers generally use protection methods. The abnormal working conditions of transformers mainly include overload, overcurrent caused by external short-circuit, neutral overvoltage caused by external grounding short-circuit, oil level reduction caused by oil tank leakage, or temperature caused by cooling system failure Elevate etc. In addition, large-capacity transformers, due to their high rated working magnetic flux density, are proportional to the voltage-frequency ratio. When operating under overvoltage or low frequency, it may cause overexcitation faults of the transformer. In view of the above situation, large transformers generally adopt the following protection methods: 1. Gas protection: protect the internal short circuit of the transformer and reduce the oil level...
    15 2020-09

    The basic principle of transformer differential protection

    1. The working principle of transformer differential protection is the same as that of line longitudinal differential protection, both of which compare the phase and value of the current on each side of the protected equipment. Dividing line 2. The difference between transformer differential protection and line differential protection: Because the rated currents on the high-voltage side and low-voltage side of the transformer are not equal, plus the phases of the current on each side of the transformer are often different. Therefore, in order to ensure the correct operation of the longitudinal differential protection, the transformation ratio of the current transformer on each side and the compensation of the current phase on each side must be appropriately selected so that the secondary currents on both sides are equal during normal operation and external short-circuit faults. For example, the double-winding transformer 7.png3, transformation...

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