Siemens, West Germany, Chint XRM stainless steel distribution box electrical Henan Luo Xin

Electrical wiring distribution box is based on the requirements of the switching devices, measuring instruments, protective devices and auxiliary equipment assembly in a closed or semi-closed metal cabinet panel on the web or to form low-voltage power distribution equipment. You can make use of manual or automatic switch on or breaking the circuit during normal operation. With the protection of electrical cut-off circuit or alarm malfunction or normal operation. By measuring instrument can display the running of the various parameters, but also on some of the electrical parameters can be adjusted, for departing from the normal operation prompts or signals. Commonly used in each issue, distribution and substations. Structural use Edit this paragraph structure and distribution cabinet distribution box, distribution boards, power distribution panel, is centrally installed complete installation switches, meters and other equipment. Category commonly used wood metal distribution box two, because the metal distribution box protection level is higher, you still use more metal. Use distribution box use: rational distribution of electric energy, to facilitate the opening and closing operation of the circuit. A higher level of security protection, can directly display circuit conduction state. Easy to manage, when the electrical fault in favor of overhaul. Classification by structural features and usage: (1) fixed panel switchgear, often called the switch board or power distribution panel. It is a kind of masking panel open switchgear, positive protective effect, back and side still touching the live, low degree of protection can only be used for power supply continuity and reliability requirements of low industrial and mining enterprises, as centralized power supply with a transformer room. (2) Protection of formula (ie, enclosed) switchgear, refer to the mounting surface in addition, all other sides are closed up in a low-voltage switchgear. Such a switch cabinet, protection and monitoring control and other electrical components are installed in a steel or enclosure made of insulating material, it can be installed against a wall or away from the wall. You can not add each loop between the cabinet and isolation measures can also be used a grounded metal plate or insulating plate isolation. Usually the main door switch operation with a mechanical interlock. There are also shielded station switchgear (ie the console), the panel is equipped with control, measurement, signal and other electrical appliances. Protective switchgear is mainly used for craft-site power distribution equipment. (3) switch cabinet drawer. Such switch cabinet with sheet steel enclosure, inlet and outlet circuit electrical components are mounted on extractable drawer, constitute a class-powered task to complete functional unit. Between functional units and bus or a cable, use a grounded metal plate or plastic apart, forming the bus, functional units and three regional cable. There isolation between each functional unit. Switch cabinet drawer with high reliability, security and compatibility, is more advanced switchgear, switchgear current production, the majority of switch cabinet drawer. They are suitable for industrial and mining enterprises require high reliability of power supply, high-rise buildings, as centralized control of the distribution center. (4) power, lighting distribution control box. Mostly enclosed vertically. Due to the use of different occasions, shell protection grade is different. They are mainly used as industrial and mining production site of power distribution equipment. Improved Edit this paragraph fault Cause Fault 1. Environmental temperature on low-voltage electrical distribution box failure caused by the impact of the low-voltage electrical appliances, the fuses, AC contactor, residual current protection, capacitors and gauges and other components. These low-voltage electrical appliances according to GB1497 "Low Voltage basic standards" for design and manufacture, and their corresponding provisions under normal operating conditions: maximum ambient air temperature does not exceed 40 ℃; the average ambient air temperature does not exceed 35 ℃ 24h ; lower limit of the ambient air temperature is not lower than -5 ℃ or -25 ℃. Rural power grids of the distribution box in the outdoor run, it not only by direct sunlight to produce high temperature, while running itself will generate heat, so hot in the summer season, temperatures will reach cabinets above 60 ℃, when the temperature much higher than the ambient temperature of the appliances provisions, failure due to the distribution box electrical components due to overheating and thus occur. 2. Caused by a defective product quality in rural power grids in demand was due to the distribution box number, short construction period, distribution boxes for low voltage electrical plant need urgent delivery time and quantity, and thus created a demand for the product quality requirements are not Strict phenomenon, caused some products into operation shortly after the failure. Some models, such as exchanges and contacts soon after closing due to the contactor coil burned out and put into operation in the distribution box, but can not run. 3. Electrical distribution box failure caused by improper selection due to manufacturing capacity for AC contactor chooses not very appropriate for different outlet circuit installed capacity of exchanges and contacts with, and did not take into account a three-phase unbalanced load, without can partially downstream contactor current levels in the normal selection model based on a current level is selected to improve, resulting in exchange of contacts appears burned hot seasons running. 1 improvement program. For the distribution transformer capacity at 100kV · A power distribution box and above, thermal windows in the side wall of the box, it should take into account the installation thermostat relay (JU-3 type or JU-4 ultra-small temperature relay) and a shaft flow fans, electrical control panel is mounted on the side of the left side of the box, so that the inside temperature reaches a certain value (eg 40 ℃) can automatically start the exhaust fan, forced exhaust heat to the cooling box. 2. Use protection circuit prevents power distribution box external circuit failure. Choose smaller smart lack of protection, such as the choice of DA88CM-II phase motor protection module (Shanghai products) installed in the distribution box in order to prevent low-pressure phase electric motor to run and burn. 3. Improve the original wiring distribution box low-voltage capacitor group, the mounting position by the exchanges and contacts on the trailer coupling, into a low-voltage distribution box is connected between the line and meter gauge. To prevent the operation of the capacitor circuit or phase failure occurs when damage to the capacitor, resulting in inaccurate measurement metering device. In addition, capacitor selection model should be BSMJ series of products to ensure quality and reliable components, safe operation. 4. If the new column with a radio rack, in the production of distribution box enclosure, optional 2 mm and stainless steel plate, and appropriately scaled distribution box size (in JP4-100 / 3W type used by the project-based agricultural reform on, in the original box width dimension increased by about 100 mm, that is, change the original 680 mm 780 mm improved power distribution box external dimensions:. 1300 mm × 780 mm × 500 mm), in order to increase each branch between qualifying, electrical safety outlet and tank shell distance, it is a good operation and maintenance electricians and replacement fusible element, but also to the heat. 5. Use energy-saving AC contactor (similar CJ20SI type), and note the AC contactor coil voltage remaining for the selected current device is connected to corresponding terminals, pay attention to correct load matching. When selecting exchanges and contacts, should be used in the insulation rating of A or above grade product, it must ensure that its main circuit contact current rating should be greater than or equal to the load current is controlled lines. Contactor solenoid rated voltage is 380V or 220 V, coil to allow use in a range of 80% to 105% of rated voltage. Company Website: http: //www.henanluoxin.com