Collect and list the electrical symbols of double-winding transformers, three-winding transformers, autotransformers, three-phase transformers, etc., for your reference when drawing or learning.
First, the electrical symbol of the double winding transformer
The most basic type of transformer consists of two sets of coils wound with wires, which are inductively weighed together by each other. When one AC current (with a known frequency) flows into one of the coils, an AC voltage of the same frequency will be induced in the other set of coils, and the amount of the induced voltage depends on the degree of coupling and magnetic interlocking of the two coils.
Double winding transformer symbol
A shielded double-winding single-phase transformer between the windings
A transformer with a center point tap on one winding
Coupling variable transformers
Electrical symbols for two and three winding transformers
The three-winding transformer has 3 windings per phase, and when 1 winding is connected to the AC power supply, the other 2 windings induce different potentials, which are used for loads that require 2 different voltage levels. Power plants and substations usually have three different levels of voltage, so three-winding transformers are widely used in power systems. The high, medium and low voltage windings of each phase are set on the same core column. In order to use the insulation reasonably, the high-voltage windings are usually placed in the outermost layer, and the medium-voltage and low-voltage windings are placed in the inner layer.
Three-winding transformer symbol
Third, the electrical symbol of the autotransformer
The coupling of autotransmitter is the meaning of electromagnetic coupling, the ordinary transformer is transmitted by the electromagnetic coupling of the primary and secondary coils, the primary and secondary sides have no direct electrical connection, the original and secondary sides of the autotransformer have a direct electrical connection, and its low-voltage coil is part of the high-voltage coil.
Autotransformers
Single-phase autotransformer
Three-phase autotransformer with star connection
Single-phase autotransformer with adjustable voltage
Fourth, three-phase transformer electrical symbols
Three-phase transformers are widely used in circuits with AC 50Hz to 60Hz and voltage below 660V, and are widely used in imported important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifier devices, lighting, etc. The various input and output voltages of the product, the connection group, the number and position of the adjustment tap (generally ±5%), the distribution of the winding capacity, the equipment of the secondary single-phase winding, the application of the rectifier circuit, whether the housing is required, etc., can be carefully designed and manufactured according to the user's requirements.
A three-phase transformer connected by a star triangle
A three-phase transformer with a star connection of one tap, each primary winding in addition to its end also shows an available connection point
A three-phase transformer consisting of a single-phase transformer connected by a star triangle
Three-phase transformer with star delta connection with on-load tap-changers
Star-shaped zigzag neutral points lead to a connected three-phase transformer
A three-phase transformer connected by a star-shaped star triangle
This article is quoted from: https://www.vfe.cc/NewsDetail-1109.aspx