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6 kV power distribution transformer Analysis of safety problems
With the rapid growth of power load, especially the safety problems caused by improper design and installation of its outgoing line after the fuse at the low voltage side of the post mounted transformer is burnt out, the author analyzes the power supply reliability, power supply safety and personal safety of maintenance personnel caused by accidents caused by hidden dangers of distribution transformers.
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elementary analysis transformer Abnormal phenomena and troubleshooting in operation
Transformer plays an extremely important role in the power transmission and distribution system. Compared with other electrical equipment, its failure rate is low, but once the failure occurs, it will bring great harm to the power system and industrial and agricultural production. Therefore, it is a basic skill for every power operator to make rapid and correct judgment and treatment for various abnormalities and faults of transformers in operation, eliminate hidden dangers and defects of equipment as soon as possible, so as to ensure the safe operation of transformers and the safe operation of power systems.
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Transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. Its main components are the primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc
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CST series digital transformer Operating procedures for protective devices
1.1 This procedure is formulated to strengthen the operation management of relay protection and automatic safety devices in Guyuan Power Grid, improve the safe and stable operation level of the power system, and ensure the reliable operation of the power grid. 1.2 This procedure is applicable to the corresponding relay protection and safety automatic device of each substation of Guyuan Power Grid. Relay protection management personnel, commissioning personnel, dispatchers and substation (operation team) operators at all levels of Guyuan Power Grid shall be familiar with relevant provisions of this procedure and strictly implement it. 1.3. In the process of implementing this procedure, if any problem is found or inconsistent with the relevant regulations of the superior, it shall be timely contacted with the relay protection room of Guyuan Power Supply Bureau, and the relay protection room shall coordinate to solve the problem. 1.4 The right to revise and interpret this procedure belongs to the relay protection room of Guyuan Power Supply Bureau. 1.5. This procedure shall come into force as of the date of promulgation.
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transformer Oil fault and dissolved gas analysis in oil
The principle of the three ratio method is to select two gases with similar solubility and diffusion coefficient from five characteristic gases according to the interdependence between the relative concentration and temperature of the gas component content generated by the cracking of oil and insulation in oil filled electrical equipment under fault
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Together transformer Analysis of phase sequence reversal accident of HV side cable
The safe operation of the auxiliary power supply directly affects the safety of the generator set. In various accidents of the auxiliary power supply, there are few short circuit accidents caused by the cable phase sequence connection, which accounts for a small proportion in various accidents and is easy to be ignored. However, the short circuit will cause great harm to people and equipment, and serious enough to cause the consequences of machine damage and human death. People should pay attention to it.
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GB/T 7595-2017 In operation transformer Oil quality
This standard specifies the quality standards of mineral transformer oil and circuit breaker oil in operation. This standard is applicable to the quality supervision of mineral transformer oil and circuit breaker oil filled with electrical equipment during operation. This standard does not apply to mineral insulating oils used as impregnant in cables or capacitors.
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2X1600KVA transformer Power distribution system diagram
2X1600KVA transformer distribution system diagram. The project data is in dwg format, including detailed schematic diagrams of each section, internal and external plans, plans of each floor, etc., with design specifications and detailed contents. Welcome to download and view, thank you~
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Minera oil type transformer 3000kVA Minera Oil Type Transformer Parameters up to 20MVA/36kV Even in harsh conditions, Trihal transformers can maintain high performance and efficiency, thus providing a high level of safety and reliability. Trihal transformer is very suitable for demanding indoor environment applications such as hospitals, data centers and airports. With the new
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Small welding transformer design model (Transformer) is a device that uses the principle of electromagnetic induction to change the AC voltage. Its main components are the primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. It can be divided into: power transformer and special transformer (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mine transformer, audio frequency transformer, intermediate frequency transformer, high-frequency transformer, impulse transformer, instrument transformer, electronic transformer, reactor, mutual inductor, etc.) according to the purpose. Circuit symbols commonly used
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Dry type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC mechanical equipment and other places. In brief, dry type transformers refer to transformers whose core and winding are not immersed in insulating oil. This drawing contains high and low voltage winding and casting mould of 1250 capacity dry-type transformer
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High frequency ferrite core transformer model, ferrite core is a kind of high frequency magnetic conductivity material (the principle is the same as silicon steel sheet, but it is only used in high frequency environment), mainly used as high frequency transformer (such as switching power supply, line output transformer, etc.), high frequency magnetic ring (for anti-interference), etc., to increase the permeability, improve the inductance quality factor, and used inside the transformer
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The transformer capacity is 1750kva, and the voltage level is 400v to 600v. Only two voltages are used. Because the voltage is low, there is no tapping gear outlet board. The three-dimensional diagram includes the transformer body, temperature controller and trunking wiring. It is easy for readers to understand. Drawings are drawn with solidworks 2016
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Enclosure design model of outdoor transformer This is a design model diagram of outdoor transformer enclosure. Transformer is a device that changes AC voltage based on the principle of electromagnetic induction. Its main components are primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. (SW2010 drawing, not including parameters, but editable model)
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transformer Straight line fitting of loss curve
At present, it is difficult to calculate the daily loss of large transformers in the general power industry. In this paper, a shortcut to estimate transformer loss value is obtained by fitting the transformer loss curve with a straight line and skillfully using formula transformation.
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The voltage regulating transformer includes the transformer body, voltage regulating switch, temperature controller, fan and other parts. The voltage regulating transformer is used to regulate the grid voltage without power failure to ensure the required voltage. Three dimensional drawing details the structure of each component
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1. Power transformer Design of simulation model
Under the programming environment of Matlab, this paper analyzes the current methods of transformer simulation. In the case of single-phase, the phenomenon of saturated and unsaturated inrush current and the characteristics of single-phase inrush current are analyzed. In the three-phase case, based on the piecewise fitting and curve compression method, the mathematical simulation models of three-phase transformers under the four most commonly used connection modes Yd11, Ynd11, Yny0 and Yy0 are established by using two modified arctangent functions and two modified arctangent functions plus two straight lines to simulate saturation, and are simulated in Matlab. By analyzing the waveform of three-phase inrush current and hysteresis loop, and the characteristics of three-phase inrush current, the main factors affecting the inrush current of three-phase transformer are summarized. Finally, the advantages and disadvantages of the two methods are analyzed, and a relatively perfect transformer simulation model is established.
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Excel format, electromagnetic calculation software.
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Excel format, using power transformer electromagnetic optimization calculation.
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Excel format, electromagnetic calculation of 220kV power transformer.
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Foreign transformer design software, I feel it is OK, excel format
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transformer Measures to reduce consumption, save energy and increase efficiency
According to the characteristics of comprehensive energy consumption of the company's transformers, the important role of enterprise distribution transformers in the field of energy conservation is introduced. Through theoretical analysis, research and practical application, organize the economic operation of the company's transformers, the power saving operation of transformer tap changers, balance the three-phase load of transformers, and adjust the load curve to reduce transformer losses.
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How to strengthen power distribution transformer Optimize configuration
The protection configuration of distribution transformer mainly includes circuit breaker, load switch or load switch plus fuse. Load switch can save investment, but can not break short circuit current; The technical performance of the circuit breaker is good, but the equipment investment is high and the use is complex; The protection configuration mode of combination of load switch and fuse can avoid the use of circuit breaker with complex operation and expensive price. This paper briefly explains various protection configuration types of distribution transformer. Through analysis and comparison, it is proposed to strengthen the optimal configuration of distribution transformer protection and select a reasonable protection scheme, which can improve the reliability of distribution transformer protection action.
