The power distribution cabinet (box) is divided into power distribution cabinet (box), lighting distribution cabinet (box), and metering cabinet (box). It is the final equipment of the power distribution system. The power distribution cabinet is the general term for the motor control center. The power distribution cabinet is used in the occasions where the load is relatively dispersed and there are few circuits; the motor control center is used in the occasion where the load is concentrated and there are many circuits. They distribute the electric energy of a certain circuit of the upper-level power distribution equipment to the nearby load. This level of equipment should provide protection, monitoring and control of the load.
Classification:
The first-level power distribution equipment is collectively referred to as the power distribution center. They are centrally installed in the enterprise's substations to distribute electric energy to lower-level power distribution equipment in different locations. This level of equipment is close to the step-down transformer, so the electrical parameter requirements are higher, and the output circuit capacity is also larger.
Secondary power distribution equipment is a collective term for power distribution cabinets and motor control centers. The power distribution cabinet is used in the occasions where the load is relatively dispersed and there are few circuits; the motor control center is used in the occasion where the load is concentrated and there are many circuits. They distribute the electric energy of a certain circuit of the upper-level power distribution equipment to the nearby load. This level of equipment should provide protection, monitoring and control of the load.
The final power distribution equipment is collectively called the lighting power distribution box. They are far from the power supply center and are scattered small-capacity power distribution equipment.
The electrical components and lines in the distribution board (box) should be in good contact and reliable connection; there should be no serious heating or burning. The door of the switchboard (box) should be intact; the door lock should be kept by someone. In view of the current situation that the power distribution in the computer room is prone to single-point failures, it integrates the most advanced technological achievements and hardware and software design in one. Committed to bringing a new experience to the construction and management of power distribution in the computer room, it is mainly used in data centers and computer rooms such as finance, telecommunications, enterprises, and government, with a capacity range of 30KVA-160KVA. The entire power distribution system adopts a standard network cabinet and modular structure design, with a wealth of optional accessories, and can customize personalized high-reliability products for customers according to the actual needs of the computer room.
The intelligent power distribution cabinet monitors the current of each output branch in real time, and can set the pre-warning value of the abnormal current of each output branch. For example, if the 16A switch is set, the alarm value is set to 14A, and the load exceeds 14A. Or hidden dangers of human operation, to avoid overloading, the switch cuts off the power supply, causing the entire cabinet to power off. In addition, a hot-swappable circuit breaker is selected for the output shunt, which has the ability to adjust the phase of the power, and easily realizes the flexible adjustment of the 3-phase unbalance. It can also increase the output shunt online and replace the switch when the power is uninterrupted.
EDM is a machining process that uses a discharge electrode (EDM electrode) with a specific geometry to burn out the geometry of the electrode on a metal (conductive) part. EDM technology is often used in the production of blanking dies and casting molds.
The method of sizing materials using the corrosion phenomenon generated during spark discharge is called EDM. EDM is the spark discharge in the liquid medium in the lower voltage range. EDM is mainly done by the machine factory. Electric spark is a self-excited discharge, and its characteristics are as follows: The two electrodes of spark discharge have a higher voltage before discharge. When the two electrodes are close, after the medium is broken down, spark discharge occurs immediately. With the breakdown process, the resistance between the two electrodes decreases sharply, and the voltage between the two electrodes also decreases sharply. The spark channel must be extinguished in time after a short period of time (usually 10-7-10-3s) in order to maintain the "cold electrode" characteristic of spark discharge (that is, the heat energy converted by the channel energy cannot be transmitted to the depth of the electrode), so that Channel energy acts on a very small area. The effect of channel energy can cause the electrode to be corroded locally.
Corona refers to the phenomenon that partial discharge occurs on the surface of a charged body in a gas or liquid medium. It often occurs around high-voltage wires and near the tip of a charged body, which can produce ozone, nitrogen oxide and other substances. In substations and lines above 110kV, light layers similar to solar halos often appear, making sounds of "chichi" and "bimile". Corona can consume electricity and interfere with radio waves. Corona is a stable discharge in the form of electron avalanche-streaming that is unique in extremely uneven electric fields.
The corona is produced because the uneven conductor produces an extremely uneven electric field. When the voltage rises to a certain value near the electrode with a small radius of curvature around the uneven electric field, a discharge will occur due to the free air, forming a corona. Because the electric field around the corona is very weak, no collision and dissociation occurs. The charged particles around the corona are basically charged ions, and these ions form the corona discharge current. To put it simply, a conductor electrode with a small radius of curvature discharges into the air, causing a corona.
Recommend a UV sensor for electric spark and corona detection caused by poor insulation in power distribution cabinets. The waterproof UV sensor imported from Germany-UV-Arc, UV-Arc is a waterproof sensor with a thread The body (G3/4”) will be used on the train to measure the strength and length of the bow according to EN50317. This indicates the quality of contact between the pantograph and the catenary, and allows defects to be found on the wire ropes in the rail network Position. The UV-Arc sensor is configured for this particular application. It contains a very sensitive photodiode and an additional fi lter to suppress the sensitivity of solar UVB. The time constant is adjusted to the typical arc length and the metal housing provides high The electromagnetic compatibility safety.
