230 KV 220kv Power Transformer

A power transformer is defined as a transformer that operates with high voltages and currents in the power system network. It is mainly used to increase or decrease the voltage level between the generator and the distribution circuits. A power transformers has two or more windings that are magnetically coupled through a core. A varying current in one winding creates a varying magnetic flux in the core, which induces a varying voltage in the other windings. The ratio of the voltages in the primary and secondary windings depends on the number of turns in each winding.

The 230 kV 220kv Power Transformers features a KNAN/KNAF/KNAF cooling system using environmentally friendly and biodegradable vegetable oil as the insulating fluid. The transformers also features two-stage forced air cooling, with a primary power rating of 12.5 MVA and a secondary power rating of 15 MVA.
It features an ingenious sealed tank design, complemented by an oil conservation system, ensuring higher performance and longer service life.

Power Transformer

Power transformers can be categorized based on different criteria, such as their construction, function, application, etc. Some of the common types of power transformers are:

Step-up and step-down transformers: These transformers are used to increase or decrease the voltage level of an AC supply. A step-up transformer has more turns in the secondary winding than in the primary winding, while a step-down transformer has fewer turns in the secondary winding than in the primary winding.

Single-phase and three-phase transformers: These transformers are used to handle single-phase or three-phase AC supplies. A single-phase transformer has one primary winding and one secondary winding, while a three-phase transformer has three primary windings and three secondary windings that are connected in star or delta configuration.

Two-winding and autotransformers: These transformers have either two separate windings or one common winding for both primary and secondary circuits. A two-winding transformer is used when the voltage ratio is greater than 2, while an autotransformer is used when the voltage ratio is less than 2.

Distribution and power transformers: These transformers are used for different purposes in the power system network. A distribution transformer is used to step down the voltage for distribution to domestic or commercial users. It has good voltage regulation and operates at full load or near full load most of the time. A power transformer is used to step up or step down the voltage for transmission between generating stations and substations. It has poor voltage regulation and operates at variable loads depending on the demand.

Instrument transformers: These transformers are used to measure high voltages and currents in a circuit by stepping them down to lower values that can be measured by conventional instruments. They include current transformers (CT) and potential transformers (PT).

Oil-cooled and dry-type transformers: These transformers differ in their cooling methods. Oil-cooled transformers use mineral oil as a cooling medium that circulates through radiators or heat exchangers. Dry-type transformers use air as a cooling medium that flows through vents or fans.

Core type and shell type transformers: These transformers differ in their core shapes and winding arrangements. A core-type transformer has a rectangular core with two vertical limbs and a horizontal yoke. The windings are cylindrical and concentric and are placed on both limbs. A shell-type transformer has a central limb and two outer limbs that form a shell around the windings. The windings are sandwiched between the limbs and have multiple layers.

Outdoor and indoor transformers: These transformers differ in their installation locations and protection levels. Outdoor transformers are designed to withstand harsh weather conditions and are usually oil-cooled and enclosed in metal tanks. Indoor transformers are designed to operate in controlled environments and are usually dry-type and enclosed in metal cabinets.

GNEE Steel always adheres to "quality goes first". We have a strict quality inspection system with 20+ professional inspectors and various sophisticated testing instruments. We perform various tests, such as punching test, bending test, cross-cut test, writing and erasing test, coating thickness test, etc. Third-party quality tests, such as SGS, BV, CE, etc., are also acceptable. More than that, we have a series of advanced equipment to offer further processing services, such as cutting, slitting, profiling, punching, bending, etc.

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