Problems in the production of box transformers

The high-pressure scheme selects the high-voltage power supply mode into several types: ring network, dual power supply, and terminal. The measurement method is further divided into high supply and high count and high supply and low count. According to the number of transformers in the box-type transformer and the number of ring network loops, the high-voltage power supply unit is composed of an in-out switch cabinet, a transformer return cabinet, and a measuring cabinet. There are three different options for the transformer cabinet according to the primary components: 1 Selection of isolating switches and circuit breakers Organize cabinets. 2 high-voltage fuses and contactor combination appliances (F-C mode). 3 fuse and load switch combination.

High-voltage cabinets have strict five preventive measures and a high degree of protection, with grounding switches and high voltage display devices. Circuit breakers generally use vacuum circuit breakers and are equipped with protection devices. They are suitable for frequent operation and have a wide range of protection. The load switches are gas-producing, air-pressure, vacuum-type, SF6, etc. They are simple in structure, easy to operate and widely used. .

The transformer capacity in transformer box transformers is generally between 160 and 1600 kVA, and one to two units are installed, using dry change and oil change. The effect is better if the cooler air in the tunnel is sent to the room at the base vent. The natural ventilation and heat dissipation are the convection between the ventilation holes of the transformer door panel, the ventilation holes of the transformer door panel and the exhaust fan of the top cover, and the convection between the ventilation holes and the door panel or the top cover exhaust fan. At the same time, the cabinet of the transformer room is provided with a louver. In order to prevent dust, the structure of the louver can prevent dust from entering the room. The transformer room can also be equipped with air conditioning for heat dissipation, which can achieve the desired effect.

There are several ways to protect the transformer against sunlight: Add insulation on the four sides of the transformer. Take a double ply structure. The top cover adopts air floor structure with air cushion or heat insulation material. Low-voltage power distribution scheme The low-voltage power distribution room is composed of inlet cabinets, capacitor cabinets, circuit feeder cabinets, and measuring cabinets. There are generally 4 to 8 units, so there are two types of operation corridors and no operation corridors. The operation corridors are generally The width is 1000mm. In order to make full use of space, the design of the low-voltage cabinet and the wiring scheme adopted should be as compact as possible to accommodate the limited space in the box-type transformer.

It is important to conclude that the selection of the transformer and the manufacturing process of the box-type transformer should fully meet the needs of the site and reflect a certain level of manufacturing. Therefore, China's box-type transformer manufacturing industry, on the basis of fully absorbing foreign technology, continues to make products that offer cheap prices.