up to 35kv Oil-Immersed Power Distribution Transformer

BRIEF INTRODUCTION Favorable to meet the power peak demands of summer, CEEG's oil-immersed power transformers are suitable for distribution networks with high load rates under high temperatures and places with shock load and continuous overload requirements. Such as steel, metallurgical industry, railroad transportation, power plant, hydropower station, etc. FEATURES LOSS LOSS LOW NOISE STABLE & RELIABLE . 7-stage temperature control technology system, which combined with the temperature field dinite element analysis, to ensure full play to the performance advantages of various insulation materials.2. The insulation system is based on DuPont Nomex ® Insulation paper technology.3. Low noise: unique noise reduction measures are adopted in different parts to ensure that the noise control is better than the national standards.4. Low loss: The core is made of high-quality cold-rolled silicon steel sheet with high magnetic conductivity, using the Swiss core automatic laminating machine or longitudinal and transverse shearing, multi-stage full-slant seam automatic laminating, core tying using overall pressure and PET tape tying process, effectively reducing the no-load loss and no-load current of the transformer.5. No leakage: The oil tank and oil storage cabinet have been tested for positive and negative pressure to ensure that there will be no oil leakage during normal operation. The components are installed with a flange groove structure, and all seals are made of high-quality once-formed acrylate rubber parts to prevent il-leakage.6. Strong short circuit resistance: The transformer coils are calculated with reasonable ampere-turn balance and semi-rigid copper wire is used. The core claiming parts are calculated for strength and stiffness to meet the safety requirements of maximum short-circuit mechanical force. The winding pads are all densified and made of high-density rigid cardboard and adopted integra set & integral pressing to ensure the accuracy of assembly and the short-circuit resistance. CERTIFICATED & QUALIFIED The oil-immersed power transformers have passed the test of the National Transformer Quality Supervision and Inspection Center, and all indicators have reached the advanced level of domestic and international products. The performance indicators meet the energy efficiency requirements of GB20052-2020  and also won the 3C, PCCC energy-saving certification, ISO-9001, ISO-45001, and ISO-14001 certificates.CEEG's oil-immersed power transformers have been widely adopted in key projects by customers from all over the world. For example, they have been chosen to serve in the construction projects of Beijing China Coal Electric Co., Ltd., Shenhua United Construction Co., Ltd., and Chongqing Yuzhan Electric Co., Ltd. 7- STEP TEMPERATURE CONTROL TECHNOLOGY The mature structure and technology of a traditional transformer shall be adopted as far as possible in the structure of a high-temperature liquid-immersed transformer, which retains the advantages of reliability, good manufacturability, and economy of the traditional transformer. The biggest difference between thistransformer and the traditional transformer is that the actual situation of the temperature field in the transformer is reasonably considered in the design, and the insulation materials with different temperature resistance grades are reasonably used according to the temperature distribution to form a hybrid insulation system. With the help of transformer temperature field simulation technology, the temperature distribution of the transformer (mainly winding and its vicinity) can be determined more accurately. According to different temperature ranges, different grades of insulating materials can be selected to give full play tothe high-temperature resistance characteristics of materials, and at the same time, it has a good economy.The actual maximum oil temperature of this liquid-immersed transformer is set at 95 ºC, which ensures that the transformer has good safety, a thermal performance margin, and long expected life. For the temperature design of the whole transformer, we propose and implement the concept of a "seven-step temperature control technology" as the design principle, that is, gradually extends from the vicinity of the winding hot spot with the highest temperature to the external low-temperature area and divide it into five levels, and consider the short circuit and overload to form a seven-level thermal state for temperature control:1/  Insulation material temperature control technology: different insulation materials shall be selected according to the temperature of different parts of the winding and body. The control winding hot spot temperature.2/  Temperature control technology of liquid flow circuit: it is a technology to determine and control the liquid flow temperature of each part by comprehensively considering the relationship between the liquid velocity field and temperature field. Control the bound