Ⅰ. Different properties between a distribution transformer and a power transformer
1. Power transformer: A static electrical device used to convert a certain AC voltage (current) value into another or more different voltage (current) values of the same frequency.
2. Distribution transformer: In the power distribution system, according to the law of electromagnetic induction, an electrostatic electrical appliance that transfers AC power by changing the AC voltage and current.
Ⅱ. Different classification between a distribution transformer and a power transformer
1. Power transformer
(1) Power transformers are classified by purpose: step-up (6.3kV/10.5kV or 10.5kV/110kV in power plants, etc.), contact (220kV/110kV or 110kV/10.5kV between substations), step-down (35kV/0.4kV or 10.5kV/0.4kV for power distribution)
(2) This kind of machine made by power transformer suppliers can be divided into two categories according to the number of phases, which includes single-phase and three-phase.
(3) Power transformers are classified according to windings: dual windings (each phase is installed on the same core, the primary and secondary windings are separately insulated), three windings (each phase has three windings, the primary and secondary windings are separated, and the autotransformer ( The center tap of a set of windings is used as primary or secondary output).
(4) Power transformers are classified according to the insulating medium: oil-immersed transformers (flame-retardant, non-flame-retardant), dry-type transformers, and 110kV SF6 gas insulated transformers.
2. Distribution transformer
(1) Our distribution transformer china is divided into oil-immersed transformer and dry-type transformer according to different insulating media.
(2) According to the different voltage regulation methods, it can be divided into non-excitation voltage regulating transformer and on-load voltage regulating transformer.
Ⅲ. Different power supply methods between a distribution transformer and a power transformer
1. Power transformer
(1) The operating mode of the 10kV high-voltage power grid is a three-phase three-wire neutral point ungrounded system.
(2) The user transformer power supply mostly adopts the YYN0 connection mode of the neutral point directly grounded system operation mode, which can realize three-phase four-wire or five-wire power supply, such as TN-S system.
2. Distribution transformer
(1) The operating mode of the 10kV high-voltage power grid is a three-phase three-wire neutral point ungrounded system.
(2) The power supply of the user transformer such as the 110kv oil immersed power transformer mainly adopts the operation mode of the neutral point directly grounded system D/yn11 connection, which can realize the three-phase four-wire system power supply.
