Box transformer (commonly known as box transformer) is a kind of high-voltage circuit breaker machine equipment distribution transformer, low-voltage switching machine equipment, electromagnetic energy measurement and verification equipment and reactive power compensation equipment, etc., according to a certain wiring plan in one or more box body compact complete set of equipment distribution equipment. It is suitable for the rated current 10/0.4k HD V three-phase communication AC system software, as a route and distribution of electromagnetic energy.
Compared with the American box of the same volume, the structure of the box-type substation is more effective. Because the American box changes the transformer and the general high-voltage electrical equipment are installed in the same plastic shell shell, the indoor temperature of the transformer is very high, resulting in difficult heat pipe heat dissipation and harmful load rate; On the other hand, the general high-voltage and high-voltage load switches and circuit breakers and low-voltage distribution cabinets are selected in the housing, so the American box has a large variable volume.
Box-type substation is different from American box-type transformer in structure. From the layout point of view, the bottom pressure chamber, transformer room, and high pressure chamber are not mesh layout, but product layout. From the perspective of structure, this kind of van transformer is divided into front and back two parts. The front side is the actual operating distance of high and bottom pressure. The actual operating distance includes high voltage and low voltage terminal block, high voltage load switch actual operating handle, no-load variable voltage division power switch, plug-in circuit breaker, oil level meter, etc. The rear side is the car fuel tank and radiator, and the transformer winding, transformer core, high voltage and high voltage load switch and circuit breaker are put into the transformer oil tank. The high voltage arrester also uses the oil variable hydroxide high voltage arrester.
The transformer removes the oil pillow and adopts the standard design scheme of oil and magnetic density volume stability. The automobile oil tank and the heat pipe radiator are exposed in the air, and the heat pipe is not difficult to dissipate heat. The low-voltage circuit breaker uses the plastic-case circuit breaker as the main isolation switch and the group outlet isolation switch. Because of the simple structure, the area and volume of this type of box change is greatly reduced, because its volume is not large and only one side of the door is opened, its required area is only 1/4 of the American box change, and the volume is only 1/5-1/3 of the same volume American box change. The high voltage side of the box-type substation uses circuit breaker maintenance, and the bottom pressure side uses plastic-case automatic air circuit breaker maintenance, which is the same as the protection measures of 10kV distribution in China.
The high voltage fuse maintains the common faults inside the transformer, and the automatic air circuit breaker maintains the overcurrent flow, short circuit fault and underworking voltage common faults on the line of the bottom pressure side. The defects of box-type substation. Because the high-pressure load switch is immersed in the oil, the oil is charred and dissolved by the electric arc, resulting in harmful substances such as acetylene gas, which reduces the characteristics and has caused safety accidents. Can not see the significant break point, maintenance is not convenient. Because the maintenance and metrological verification method of the bottom pressure in Britain is different from that in China, there is no maintenance and metrological verification of the box type substation itself. In order to consider the needs of Chinese customers, the domestic box-type transformer is modified in the bottom pressure side of the low-voltage distribution box. Because the van-type variable is under the direct sunlight for a long time, it harms the heat dissipation of the heat pipe of the plasticized case circuit breaker, and causes the isolation switch to not break the load and short circuit capacity normally, which is easy to cause common faults on the high pressure side.
Post time: Sep-29-2024
