Analyze and handle the abnormity of disconnector during operation
There are many abnormalities of disconnectors in the substation equipment. Analyze and deal with the abnormalities of disconnectors in operation (1) The disconnector is allowed to operate for a long time under the rated current and rated voltage. The temperature of the connector with the conductor during operation should not exceed 70 ℃. The disconnector should not have a special arc extinguishing device. Therefore, it is forbidden to open and close with l
Types and descriptions of power cables
The core of yjv cable mainly includes single core, 2 core, 3 core, 4 core, 5 core, 3+1, 3+2, 4+1. 3+1 represents 3 phase lines+1 ground wire, 3+2 represents 3 phase lines+2 ground wires, and 4+1 represents 4 phase lines+1 ground wire. According to the standard models, the specific size models include: 1 square, 1.5 square, 2.5 square, 4 square, 6 square, 10 square, 16 square, 25 square, 35 square, 50 square, 70 square, 95 square, 120 square, 150 square
What are the main components of oil-immersed transformer?
Oil-immersed transformer is composed of primary winding, secondary winding, iron core, oil tank, base, high and low voltage bushing, respirator, radiator (or cooler), oil purifier, oil conservator, gas relay, safety airway, tap switch, thermometer and other components and accessories. Oil-immersed transformer is a new type of high-performance transformer with more reasonable structure and better performance. Its three-dimensional winding iron core has no air
What is the normal operating temperature of dry-type transformer
The insulation and heat resistance of dry-type transformers are usually Class F and Class H. For dry-type transformers with Class F insulation, the temperature of the hottest point of the winding shall not exceed 155 ℃. For dry-type transformers with Class H insulation, the temperature of the hottest point of the winding shall not exceed 180 ℃.
Characteristics of high voltage post resin insulator
Its main raw materials are the pellet prepreg formed by fully mixing GF (chopped glass fiber), UP (unsaturated resin), MD (filler calcium carbonate) and various additives. BMC materials were first applied in the former West Germany and Britain in the 1960s, and then developed greatly in the United States and Japan in the 1970s and 1980s respectively. Because BMC bulk molding compound has excellent electrical properties, mechanical properties, heat resistance, chemical corrosion resistance, and is suitable for various molding processes,
Can dry-type transformers be installed outdoors?
The dry-type transformer cannot be installed in the open air, which is very dangerous. The dry-type transformer must be installed in a dry place during operation, so it cannot be installed in the open air. Distribution box must be used for protection, with the protection grade of IP54 or above, and the transformer is not likely to be contaminated with water. In addition, the distribution box needs to consider heat dissipation, which can ensure that the tempera
Daily maintenance of power transformer
In the daily maintenance of transformer, it is necessary to monitor the operation status of transformer in real time, especially in the case of overload operation, and shorten the monitoring period. Regularly inspect the voltage, current, upper oil temperature, etc. of the transformer, and often inspect the external part of the transformer. Check the cleanness of the casing and magnetic skirt and clean them in time. When the cooling device is running, confirm the butterfly valves of the cooler inlet and outlet pipes to ensure that
The types of waste transformers are divided into oil immersed transformers, distribution transformers, oil immersed distribution transformers, amorphous alloy transformers, copper core distribution transformers, aluminum core transformers, etc. The prices of waste transformers are different, for example, about $1450/t for the second-hand copper core transformer s9 series; The second-hand aluminum core transformer is about $950/ton. As the price of raw material
Box-type transformer station exported to Africa
On January 2, 2023, our company completed the final assembly of a batch of prefabricated box-type substations exported to Africa, and is stepping up the commissioning. It is expected to ship next week. The substation product is independently developed by our company, with the advantages of high integration and high informatization, which can be used for emergency rescue and mobile operation, and can greatly shorten the installation period. A total of two sets
West African politicians visited the factory
On the afternoon of June 17, 2017, West African customers visited the factory for inspection. The general manager accompanied and went deep into the production workshop to learn about the development history of TNNPI, the scale of the group, and the R&D and production of products. The guests appreciated the strength and scale of our transformer and distribution cabinet manufacturing technology, and said that the visit was very fruitful, which effectively promoted friendly exchanges and cooperation between the two sides, And re
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