Usage:Change voltage Phase:Three Coil Structure:Toroidal Cooling Method:ONAN/ONAF
A three-winding transformer has three windings on each phase. When one winding is connected to AC power, the other two windings induce different potentials. This transformer is used for loads that require two 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, middle and low voltage windings of each phase are sleeved on the same iron core. For reasonable insulation use, high voltage windings are usually placed on the outermost layer, and medium and low voltage windings are placed on the inner layer.
1.High security and reliability in operation.
2.Economic and efficient to reduce network loss and working cost.
3. High short circuit strength and insulating strength.
4. Low temperature rise. Low noise.
5.Good economic: The no-load loss is reduced by 30% on average, and the no-load current is reduced by 70%-85%.
6.Long service life: Transformer tank adopts fully sealed structure, which can be bolted or welded along the tank. Transformer oil does not contact with air and prolongs service life.
7.Running high reliability: The relevant parts of tank seal are improved to increase the reliability and improve the technological level to ensure the reliability of seal.
The three-winding transformer is most commonly used in power systems. Using a three-winding transformer to connect three different voltage transmission systems is more economical, requires less floor space, and is easier to maintain and manage than using two ordinary transformers. The three-phase three-winding transformer usually adopts Y-Y- △ connection, that is, the primary and secondary windings are both Y-connected, and the third winding is connected as △. The △ connection method itself is a closed loop, allowing the third-phase harmonic current in the same phase to pass, so that the third-harmonic voltage does not appear in the Y-connected primary and secondary windings. In this way, it can provide a neutral point for both the primary and secondary sides. In a long-distance power transmission system, the third winding can also be connected to a camera to increase the power factor of the line.
The rated capacity refers to the capacity of the winding with the largest capacity. The percentage of the general capacity is divided into three forms: high, middle, and low voltage windings.