Lightning protection grounding assembly, due to equipment aging, poor performance of the main body, overtime service and later operation and maintenance to get rid of all kinds of things, the addition of in-situ improvement in the field of poor planning, consistent layout, poor construction quality and other issues, always endanger the power grid It is suitable for operation. Take care of everyone's lightning protection grounding on the above things: the ground net excavation. The local substation has been running for a long time, and some even run for 37 years. The test and test personnel shake the grounding resistance every year, can meet the requirements, and issue test reports, but rarely analyze the test data. Variety.
The structure is grounded. There are four kinds of erroneous scenes: one of the busbar frames is grounded through the main rib of the cement rod. The metal structure of the hook string is held between the two switch frames, and the bolts are grounded through the joints. The three lightning rods lead the lower line through the main rib of the cement rod. The four lightning rods are additionally applied to the lower end of the line to be reinforced within the reinforced concrete pier. The gap is horizontally arranged. The neutral discharge gap of the original 110kV transformer is mostly vertical installation. The fact that many years of operation proves that the discharge gap is installed vertically, and there are many disadvantages. It is easy to form an icicle when it encounters the image of a despicable scene, which has an effect and affects the suitability. The neutral grounding down conductor is stably grounded at two points on the main network. . The neutral point of the transformer shall have two grounding down conductors that are connected to the main grounding grid, and each grounding down conductor shall meet the requirements of thermal fluctuation. The primary equipment and equipment frame shall have two main grounding grids. The grounding leads are connected to different grounding lines, and each grounding down conductor should meet the requirements of thermal fluctuations. The connecting leads should also be convenient for live search and testing. The neutral point of the transformer is grounded, and once the problem occurs, the equipment will run off.
The expanded ground network and the original grounding network should be connected at multiple points. Grounding grid grounding resistance with time and its own erosion, grounding resistance will be tampering, and some even exceed the standard, in order to lower the main network grounding resistance, the laying of the ground net is a good action, the local substation according to the topography At the end of the main network, the grounding pile is delayed in one place, and the grounding resistance of the main network is high and low.
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The distance between the main net and the lightning rod network. As time goes by, the grounding resistance of the main network and the lightning rod network will always be added, and some even exceed the standard. It is imperative to lay the corresponding grounding grid low resistance. Directly equipped with the 'three-in-one' wiring situation, the low-voltage arrester leads the wire to be correctly wired. The substation is directly equipped with a lightning arrester on the high voltage side (because the incoming line is installed, and the protection distance of the arrester does not exceed the maximum electrical distance between the arrester and the transformer, so the scheme is omitted), the low voltage side is equipped with a low voltage arrester, low voltage arrester and transformer The neutral point of the low-voltage side and the metal casing of the transformer are grounded all the way to form the so-called 'three-in-one' wiring situation of the transformer. The low-voltage side arrester leads the lower casing to hold the outer casing of the transformer as the leakage passage of the arrester, which is not suitable for technical requirements.
Aluminum Die Casting Mould
Die-casting molds are a method of casting liquid forging, a process performed on a dedicated die-casting forging machine. Its basic technological process is: Molten metal is first filled into the mold cavity at a low speed or high speed. The mold has a movable cavity surface. It pressurizes forging with the cooling process of the molten metal, which eliminates shrinkage shrinkage of the blank. Loose defects also make the internal structure of the blank reach the forged broken grains. The overall mechanical properties of the blank have been significantly improved.
Designing Process
1. according to the product used in the type of materials, product shape and accuracy of the indicators such as the process analysis, set out the process.
2. Determine the position of the product placed in the mold cavity, analyze and design the parting surface, overflow system, and pouring system.
3. Design core assembly and fixing methods for each activity.
4. pull core distance and force design.
5. the design of the ejection mechanism.
6. determine the die casting machine, the mold frame and cooling system design.
7. Check the relative dimensions of the die and the die casting machine, draw the die and the artwork of each component.
8. the design is completed.
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