A *** there are four kinds: 1) power transformers, (2) instrument transformers, (3) test transformers, (4) special transformers.
Specifically, according to the use of subtypes are as follows:
(1) power transformers: used for transmission and distribution systems, step-up and step-down voltage.
(2) Instrumentation transformers: used for measuring instruments and relay protection devices.
(3) test transformer: can produce high voltage, used for high voltage testing of electrical equipment.
(4) special transformers: such as rectifier transformers, adjustment transformers.
What kinds of transformers can be divided into?The general classification of commonly used transformers can be summarized as follows:
(1) according to the number of phases:
1) single-phase transformer: used for single-phase loads and three-phase transformer group.
2)Three-phase transformer: used for three-phase system step-up and step-down voltage.
(2) according to the cooling mode:
1) dry-type transformer: rely on air convection cooling, generally used for local lighting, electronic circuits and other small capacity transformers.
2) oil-immersed transformer: rely on oil as a cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooled, oil-immersed water-cooled, forced oil circulation.
(3) according to the use of points:
1) power transformer: used for transmission and distribution system voltage rise and fall.
2) Instrumentation transformers: such as voltage transformers, current transformers, for measuring instruments and relay protection devices.
3) test transformer: can produce high voltage, high voltage test of electrical equipment.
4) special transformers: such as furnace transformers, rectifier transformers, adjustment transformers.
(4) according to the winding form:
1) double winding transformer: used to connect the two voltage levels in the power system.
2) three-winding transformer: generally used in power system regional substations, connecting three voltage levels.
3) Autotransformer: Used to connect power systems with different voltages. It can also be used as an ordinary step-up or step-down transformer.
(5) According to the iron core form:
1) Core transformer: used for high-voltage power transformers.
2) Shell transformer: used for high-current special transformers, such as furnace transformers, welding transformers; or for electronic instruments and TV, radio and other power transformers.
Transformer can be divided into which kinds of voltage regulation according to whether the need for power failure?On-load voltage regulation and non-excited voltage regulation two kinds of voltage regulation
Low-voltage transformers are divided into which kinds?Classification of power transformers:
(1) according to the capacity of the transformer: small and medium-sized transformers, large transformers, very large transformers
voltage;
(2) according to the number of windings: double-winding transformers, triple-winding transformers;
(3) according to the high and low-voltage coils with or without electrical connection: ordinary transformers, autotransformers;
(4) according to the transformer, the transformer, the autotransformer;
The transformer can be classified into two types of low voltage transformers. p> (4) according to the transformer regulator: non-excited regulator, on-load regulator;
(5) according to the number of phases: single-phase transformers, three-phase transformers;
(6) according to the cooling medium: oil-immersed transformers, dry-type transformers;
(7) according to the core structure: heart-type transformers, shell-type transformers.
Concrete can be divided into what kinds of production purposes?
Divided into structural concrete, road concrete, hydraulic concrete, heat-resistant concrete, acid-resistant concrete and radiation-resistant concrete, etc.
contact network columns can be divided into which kinds of uses
intermediate columns, anchor columns, conversion columns, center columns, locating columns and turnout columns, soft spanning columns, hard beam columns, bridge columns,
power transformers are divided into which kinds offrequency, 50/60HZ high-voltage, silicon bridge rectifier, low voltage, high voltage, low voltage, low voltage, low voltage. Change low-voltage, silicon bridge rectifier filter
High-frequency, switching power supply with the general dozens of K or hundreds of HZ
Transformer according to the capacity can be divided into which levels?According to GB/T6451-"three-phase oil-immersed power transformer technical parameters and requirements", the voltage level 10kV-220kV, the capacity is as follows (kVA):
30,50,63,80,100,125,160,200,250,315,400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000, 20000, 25000, 31500, 40000, 50000, 63000, 90000, 120000, 150000, 180000, 240000, 300000, 360000