どのカテゴリーでトランスに分類することに基づく冷却方法について教えてほしい。

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 methods. This article will explore the different types of transformers categorized by cooling methods, analyzing their main characteristics and application fields. Content 1. Natural Cooling Transformers Natural cooling transformers dissipate heat to the surrounding environment throughnatural convection, radiation, and conduction. These transformers are simple in structure and easy to maintain, making them suitable formedium and […]

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 specialized tool for lead installation—the lead pulling pulley device—can be developed. First, select 25×25 angle steel and bend it into two door-shaped frames with a height of 350mm. These frames should possess sufficient strength and rigidity to withstand the forces generated during the installation process. Next, weld the frames onto the outside of a clamp,

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 of the impregnation tank, pour in the impregnating varnish until it covers the coil by more than 50mm from the top, and close the transfer valve. (4) Vacuum: Evacuate again and maintain for about 30 minutes. (5) Pressurization: Close the vacuum valve of the impregnation tank, open the pressure valve, and increase the pressure to

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 to voltage increases caused by changes in system parameters due to circuit breaker operations, system faults, or other reasons, leading to the conversion or transfer of electromagnetic energy within the power grid. Contact LuShan, est. 1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 50+ years. Leading products are single-phase transformer,

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 contact of switches, or incorrect lead connections. 3. Insulation Resistance and Absorption Ratio (Ro/R₁s) or Polarization Index Measurement: Measures the insulation resistance R at 2500V for 60 seconds and compares it with the insulation resistance Rs at 15 seconds. This is a sensitive indicator for assessing transformer insulation degradation and moisture levels. The ratio of

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, is a Chinese professional manufacturer specializing in power transformers and reactors for 50+ years. Leading products are single-phase transformer, three-phase isolation transformers, electrical transformer, distribution transformer, step down and step up transformer, low voltage transformer, high voltage transformer, control transformer, toroidal transformer, R-core transformer; DC inductors, AC reactors, filtering reactor, line and load reactor, chokes,

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 or solely as a stable winding to eliminate third harmonic voltage (not connected to the load). If used exclusively for eliminating third harmonic voltage, its short-term thermal capacity should be equal to 1/3 of the main winding. (3) The presence of the d-shaped winding ensures the stability of the neutral point in the Y-shaped winding.

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 the D-shaped winding, the neutral point on the primary side is stable. Therefore, the Yd winding configuration is mainly used in large-scale step-down transformers. If the Dy winding configuration is used, it has similar characteristics to the former but can be applied to step-down transformers for four-wire system supply and large-scale step-up transformers. Contact LuShan,

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 the possibility of the arrester disconnecting from the transformer line terminal. This ensures that when the autotransformer’s output terminal is disconnected, the lightning arrester remains connected to the transformer’s output terminal. This approach has the following advantages: a. In the event of a lightning strike on the high-voltage side, it prevents the occurrence of person-to-wave