The high-voltage switchgear is a complete set of products. Although there are hundreds of manufacturers in China, the core components are still imported products. If technical problems are encountered, equipment maintenance and replacement are more troublesome. Therefore, the budget is sufficient. In the case of the situation, we should try to choose a well-known brand. Because of its sufficient stocking, the solution efficiency is higher when encountering problems.
2. Inspection qualification
Before purchasing, you should ask the manufacturer for the factory test outline (or requirements) of the switchgear. Generally, regular manufacturers will have it. It should be clear whether the main components are configured according to the drawings and select the designated brands, such as Siemens, Schneider, etc. .
3. Cabinet material
The high-voltage switchgear has a large volume. Therefore, the cabinet material has a great influence on the price. Under normal circumstances, the component brackets and the like are all made of imported aluminum-zinc plate, and the door plate is made of 300 series high-quality steel plates.
4. The whole set of cabinets
The arrangement order of the cabinets and the position of the operating surface are the correct construction basis for the manufacturer to consider the problems of making the inner partition, the terminal guard and the busbar bracket. The layout plan should be consistent with the actual position of the on-site and in-out lines, especially to correctly represent Out of the direction of the operating surface of the cabinet, the high-voltage cabinet can be installed smoothly after it arrives at the site. It is often not taken seriously at first. After the equipment arrives at the scene, it is found that it does not meet the requirements of the site, and finally leads to rework.
5. In and out line mode
There are basically two connection methods for the conventional inlet and outlet lines on the switchgear: (1) the cable compartment of the inlet and outlet cables, and (2) the inlet and outlet lines are led out by the wall through the cabinet, and the busbar bridge is connected to the busbar bridge and then through the wall bushing. Overhead line connection. There are also a few users, the cable cable holder is introduced from the top of the cabinet, the cabinet is connected, the cabinet top is connected, and a safety net frame is additionally provided. The user provides a system diagram and standard plan when ordering, but the way of entering and leaving the line cannot be fully expressed. The user should explain it in the actual installation requirements of the technical agreement on site, and it is difficult to install it on site.
6. Circuit breaker breaking capacity is correctly selected
On the system diagram, the selected circuit breaker indicates that the circuit breaker breaking capacity must be selected in addition to the circuit breaker model, rated operating voltage, and rated operating current. There are user drawings, the breaker breaking capacity is not selected, which makes the engineering plant difficult to design. The breaking capacity selection is selected according to the system short-circuit parameters. If the manufacturer does not understand the system short-circuit parameters, it is difficult to make the correct. select. There are also some user drawings, regardless of the system short-circuit parameters, blindly choose high breaking parameters, resulting in unnecessary waste of funds. It is important to choose the right breaking capacity, both to ensure safe operation and to reduce product costs.
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