A, Introduction:
Three-phase transformers are widely used in AC 50Hz to 60Hz, voltage 660V circuit, widely used in the import of important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifier, lighting and so on. Products of various input and output voltage level, connection group, adjust the number and location of the tap (generally ± 5%), the distribution of winding capacity, secondary single-phase winding equipment, rectifier circuit, whether the use of shell, etc., can be based on the user's requirements for the careful design and manufacture.
Product features
The establishment of a new center line in the three-phase transformer - grounding can be lifted from the grid in the *** mode interference and other center line of the trouble, three-phase transformer will be converted from three-wire △ wiring into a four-wire Yo system, shielding will be further exempted from high-frequency impulses coupled from within the transformer interference and noise, although there is a shielded three-phase transformer to a variety of N-G to the interference (impulses and high-frequency noise) can be effectively used to prevent the interference. Although shielded three-phase transformers are effective in preventing a variety of N-G interference (pulse and high-frequency noise), the transformer must be properly grounded or the anti-*** mode interference will be ineffective.
Use conditions
1 Applicable altitude: ≤5000m
2 Ambient temperature: -15 ℃ ~ +45 ℃
3 Relative humidity: ≤90%
4 Installation should be free of serious impact on the transformer's dielectric strength of the gas, steam, chemical deposition, dirt, conductive dust, and no other explosive and flammable and easily corrosive substances.
5 Where not in line with the above conditions of use, should be determined in consultation with us
6 according to the user's requirements for the careful design and manufacture.
Application range
Three-phase transformer products are widely used in industrial and mining enterprises, textile machinery, printing and packaging, petrochemical industry, schools, shopping malls, elevators, postal and telecommunication, medical machinery, office equipment, test equipment, industrial automation equipment, household appliances, high-rise buildings, machine tools, tunnels, power transmission and distribution and imported equipment, and so on all the occasions that need to be guaranteed by normal voltage.
Featured advantages
1, high isolation
2, good N-G performance
3, high ****-mode interference suppression
4, △ will be converted to Y or Y to △
5, the voltage taps are easy to convert
6, according to the user's special performance requirements
Technical specifications
1 Input rated voltage: three-phase 380V or single-phase 380V or single-phase 220V2 Operating frequency: 50Hz-60Hz
3 Efficiency: ≥95%
4 Temperature rise: <60
5 Waveform distortion: <0.1%
6 High-voltage test: 2500V, 1 minute without breakdown
6 High-voltage test: 2500V, 1 minute without breakdown
7 High-voltage test: 2500V, 1 minute without breakdown
8 High-voltage test: 2500V, 1 minute without breakdown
9 High-voltage test: 2500V, 1 minute without breakdown Breakdown
Two, analysis and anatomy:
Transformer is a transformer to change the AC voltage, current and impedance of the device, when the primary coil with AC current, the iron core (or core) in the AC flux, so that the secondary coil induced voltage (or current). With the continuous development of the transformer industry, more and more industries and enterprises use the transformer, more and more enterprises into the transformer industry, the transformer by the iron core (or core) and coil composition, the coil has two or more than two windings, which is connected to the power supply of the winding called the primary coil, the rest of the windings called the secondary coil.
Transformer Parameter Variables
Views: three-phase transformer parameter variables several non-primary parameter variable notes, three-phase transformer parameter variables
1 rated power Being the frequency and voltage, the current transformer characteristics of the sign of the parameter variables
2 rated voltage Axe in the transformer's coils of the promised voltage. Transformer can work for a long time, without exceeding the temperature rise of the output power.
3 voltage ratio refers to the ratio of transformer high voltage and secondary voltage, no no-load voltage ratio and load voltage ratio difference.
4 work frequency transformer core injury consumption with frequency relationship is very large, it should be in accordance with the use of frequency to envision and use, that kind of frequency is called work frequency.
5 rate refers to the secondary power P2 to primary power P1 ratio of the percentage. As long as the transformer's rated power the greater, the higher the rate. 6 no-load injury refers to the transformer when the secondary open, the higher measured power injury. Non-major injury is the core injury, followed by the no-load current is occurring in the original coil copper resistance of the injury (copper loss) that the department of injury is small.
6 no-load current three-phase transformer secondary open there is still no certainty of the current, the current is called no-load current. No-load current by the magnetization current (flux) and iron loss current (caused by core wear). For 50Hz current transformer, the no-load current root level is higher than the magnetizing current.
7 Insulation resistance private illustration of the transformer between the coils, between the coils and the core of the insulation function. Insulation resistance is related to the function of the insulating material utilized, temperature and humidity.
Three, the use of instructions:
1. Transformer connection and linkage group
2. 60 and 35kV domestic transmission system voltage has two different phase angle.
Three-phase five-column core transformer must be used YN, yn0, yn0 connection, in the transformer to be connected to the fourth winding of the angular connection, which does not lead out of the head (structure to be done when the electrical test lead out of the head is not in this case).
Used in the domestic transformer high-voltage winding is generally associated with the Y connection, medium-voltage winding and low-voltage winding connection depends on the system situation and decide. The so-called system situation is the high voltage transmission system voltage phase quantity and medium voltage or low voltage transmission system voltage phase quantity relationship. Such as low-voltage distribution system, it can be decided according to the standard provisions.
Four, protection equipment:
Microcomputer protection device
Three-phase transformer microcomputer protection device consists of highly integrated, bus not out of the chip microcontroller, high-precision current and voltage transformers, high dielectric strength export intermediate relay, high reliability switching power supply module and other components. Microcomputer protection device is mainly used as 110KV and the following voltage level of power plants, substations, distribution stations, etc., can also be used as part of the 70V-220V voltage level between the system's voltage and current protection and measurement and control.
Differential protection device
Three-phase transformer differential protection device is mainly used to protect transformer equipment. Transformer differential protection device should have differential quick-break protection and compound ratio differential protection with or without second harmonic braking, maximum can be used for three-side differential current input occasions (three-turn transformer), with the primary equipment voltage and current analog and switching quantities of the complete and powerful collection function, equipped with standard RS485 and industrial CAN communication port, and through a reasonable configuration to realize the three-turn main transformer differential protection, two-turn main transformer differential protection, two-turn distribution transformer differential protection, and two-turn distribution transformer differential protection. It is equipped with standard RS485 and industrial CAN communication ports, and through reasonable configuration, it can realize the protection and measurement and control functions of three-turn main transformer differential protection, two-turn main transformer differential protection, two-turn distribution transformer differential protection, and non-electricity protection.
The above is all I want to share with you all the information related to three-phase transformer parameters, may not be very comprehensive, but these are what I can provide to you. In fact, there are a lot of items similar to three-phase transformers in our daily life, although they are right beside us, accompany us and bring us help, but we never pay attention to them. Since it is mentioned here today, we hope that we can pay more attention to these subtle things around us.