What categories can transformers be classified into based on the cooling methods? Transformers, as critical equipment in power systems, generate a significant amount of heat during operation. To ensure the proper functioning of transformers and to extend their service life,effective cooling measures must be implemented. Transformers can be categorized into various types based on their cooling […]
What methods are used for the installation of the flexible cable leads for the wife-carrying ducts? When installing bushings for transformers of 110kV and above, the use of soft cable leads can be labor-intensive and time-consuming, often resulting in lead bending and even partial strand breakage. To address this issue and improve work efficiency, a
What are the steps involved in vacuum pressure impregnation technology? (1) Preheating: Preheat the coil to 135-150°C and maintain for several hours, then remove the coil and lower the surface temperature. (2) Vacuum: Open the impregnation tank cover, place the coil inside, and then close the cover to evacuate. (3) Impregnation: Open the release valve
What is the basic concept of overvoltage? In the operation of various electrical equipment in power systems, besides withstanding normal system voltages, they also encounter various types of overvoltages. Overvoltages are generally classified into two categories based on their sources: external overvoltages and internal overvoltages. External overvoltages typically refer to lightning-induced overvoltages. Internal overvoltages refer
What are the routine electrical tests for transformers? 1. Voltage Ratio Test: Used to verify the voltage ratio and detect faults such as winding inter-turn or inter-layer short circuits, and check if switch leads are connected incorrectly. 2. Winding Resistance Measurement: Determines the quality of wire welding, detects faults such as winding short circuits, poor
Yyy connection：What are the characteristics ? The Yyy connection exhibits third harmonic voltage, but in three-phase three-legged core transformers, the third harmonic voltage does not exceed 5% of the fundamental. Therefore, it is suitable only for three-phase three-legged core medium to large transformers and cannot be used for three-phase five-legged transformers. Contact LuShan, est. 1975,
Yyd and Ydd Connection : What are the characteristics? The Yyd connection is suitable for transformers with various core configurations, and its features include: (1) The adoption of d-shaped winding on the low-voltage side allows for the elimination of third harmonic voltage. (2) The d-shaped winding can serve as the main winding for power transmission
How does humidity affect the operation of transformers? Relative humidity is expressed as a percentage at a certain temperature. At high temperatures, if the relative humidity is high, it is prone to the proliferation of mold. These molds may have adverse effects on the paint on the surface of the transformer tank. Additionally, in situations
Yd and Dy Winding Configurations: What are the characteristics? The Yd winding configuration is suitable for transformers with various core forms and features: a. The third harmonic current can circulate through the secondary side, eliminating the third harmonic voltage. b. The neutral point on the primary side can be grounded; since the secondary side adopts
How is the lightning arrester protection implemented at the output terminals of the autotransformer? When installing lightning arresters, it is necessary to install them at the high-voltage and medium-voltage output terminals of the autotransformer. At this point, it is required that no disconnecting switch be placed between the output terminal and the lightning arrester to prevent
