The distribution box is a switchgear, measuring instrument, protective appliance and auxiliary equipment assembled in a closed or semi-closed metal cabinet or screen according to the electrical wiring requirements to form a low-voltage power distribution device. During normal operation, the circuit can be switched on or off with the help of manual or automatic switches. In the event of malfunction or abnormal operation, the protection circuit is used to cut off the circuit or give an alarm. Various measuring parameters can be displayed by measuring instruments, and some electrical parameters can be adjusted to indicate or signal the deviation from normal working conditions. Commonly used in various hair, distribution and substations.
The following is the product model and its introduction：
EA9F1X8, EA9F1X12, EA9F1X16, EA9F1X20, TXA-36, TXA-54, TXA-72, TXA-96, TXA-36T, TXA-54T, TXA-72T, TXA-96T, TXA-36CT, TXA-54CT, TXA-72CT, TYM-08, TYM-12, TYM-16, TYM-20, TYM-24, TYM-36, TYM-08T, TYM-12T, TYM-16T, TYM-20T, TYM-24T, TYA-08T, TYA-12T, TYA-16T, TYA-20T, TYA-24T, TYA-36T, TYA-08, TYA-12, TYA-16, TYA-20, TYA-24, TYA-36
1 8 TYA-08 13678
1 8 TYA-08-W 13678W (1)
1 12 TYA-12 13679
1 12 TYA-12-W 13679W (1)
1 16 TYA-16 13680
1 16 TYA-16-W 13680W (1)
1 20 TYA-20 13681
1 20 TYA-20-W 13681W (1)
2 24 TYA-24 13684
2 24 TYA-24-W 13684W (1)
3 36 TYA-36 13685
3 36 TYA-36-W 13685W (1)
1 8 TYA-08T 13686
1 8 TYA-08T-W 13686W (1)
1 12 TYA-12T 13687
1 12 TYA-12T-W 13687W (1)
1 16 TYA-16T 13688
1 16 TYA-16T-W 13688W (1)
1 20 TYA-20T 13689
1 20 TYA-20T-W 13689W (1)
2 24 TYA-24T 13690
2 24 TYA-24T-W 13690W (1)
3 36 TYA-36T 13694
3 36 TYA-36T-W 13694W (1)
1 8 TYM-08 13695
1 12 TYM-12 13696
1 16 TYM-16 13697
1 20 TYM-20 13698
2 24 TYM-24 13699
3 36 TYM-36 13701
1 8 TYM-08T 13705
1 12 TYM-12T 13706
1 16 TYM-16T 13711
1 20 TYM-20T 13715
2 24 TYM-24T 13716
Classified by structural characteristics and uses:
(1) Fixed panel switch cabinet, often called switch board or power distribution screen. It is an open-type switchgear with a panel cover. It has a protective effect on the front. It can still touch live parts on the back and sides. The protection level is low. It can only be used for industrial and mining enterprises with low requirements for power supply continuity and reliability. Substation is used for centralized power supply.
(2) Protective (ie closed) switchgear refers to a low-voltage switchgear that is closed on all sides except the installation surface. The electrical components such as the switch, protection, monitoring and control of this cabinet are installed in a closed enclosure made of steel or insulation material, and can be installed on or off the wall. There can be no isolation measures between each circuit in the cabinet, and a grounded metal plate or insulation plate can also be used for isolation. Usually the door is mechanically interlocked with the main switch operation. There are also protective
Table-type switch cabinet (ie console), with control, measurement, signal and other electrical appliances on the panel. Protective switchgear is mainly used as a power distribution device at the process site.
(3) Drawer type switch cabinet. This type of switchgear is made of steel with a closed enclosure, and the electrical components of the incoming and outgoing line circuits are installed in a drawer that can be drawn out to form a functional unit that can complete a certain type of power supply task. The functional unit and the bus or cable are separated by a grounded metal plate or a functional board made of plastic to form three areas of the bus, functional unit and cable. There are also isolation measures between each functional unit. Drawer switchgear has higher reliability, safety and interchangeability. It is a more advanced switchgear. Most of the switchgear produced are drawer-type switchgear. They are suitable for industrial and mining enterprises and high-rise buildings that require high reliability of power supply, as a centralized control power distribution center.
(4) Power and lighting distribution control box. Most are enclosed vertical installations. Due to different use occasions, the enclosure protection levels are also different. They are mainly used as power distribution devices on the production site of industrial and mining enterprises.
Structure:
It is a complete set of equipment, such as switches, meters, etc.
Category:
There are two types of commonly used distribution boxes: wooden and metal. Because metal distribution boxes have a higher protection level, they are more often used in metal.
Use:
The purpose of the distribution box: reasonable distribution of electrical energy to facilitate opening and closing operations on the circuit. It has a high level of safety protection and can directly show the conduction state of the circuit. It is easy to manage and facilitates maintenance when a circuit failure occurs.
Indoor distribution box is a new indoor terminal distribution box product developed by Schneider Electric for the mid-to-high end commercial / civilian construction market. With simple lines and generous appearance, she has two choices of light and concealed installation. It can be widely used in apartments, villas, hotels, office buildings and other places. It is used in conjunction with Schneider Electric ’s modular low-voltage terminal power distribution products and panel switches. Provide a safe, reliable, coordinated, complete indoor low-voltage terminal power distribution solution, a good choice for real estate developers, disk manufacturers and end users!
● Single row: 8-bit, 12-bit, 16-bit, 20-bit
Multi-row: 24 (2), 36 (3)
● Rated current of distribution box: single row 63A; 2 rows ~ 3 rows 125A
● Micro-arc transparent door / opaque door
○ Single row: the door opens 110 degrees upwards
○ Multiple rows: the door opens 180 degrees to the left or right
● Material
○ Plastic cover: insulation, environmental protection, flame-resistant self-extinguishing material
Color: white; RAL 9003
○ Cabinet composition
-Concealed: made of 1.0mm steel plate, with inner hemming design. The surface is treated with electrostatic spray technology, which is durable and durable.
Has excellent corrosion resistance, suitable for concealed use.
-Surface mounting: The main structure is made of 1.2mm steel plate, and the surface is treated by electrostatic spraying technology.
Has excellent corrosion resistance;
-Single row: ABS plastic side panels on the left and right sides of the box for better appearance
-Multi-row: ABS plastic side panels on the upper and lower sides of the box for better appearance
-Knock-out tablets for extra positions, 4 x 9mm left and right
-12, 16, 20, 24, 36 position distribution boxes can be installed with two zero rows
● Standard: in accordance with GB 17466-1998
● Protection level
○ IEC 60529: IP 40
○ Level 2 protection against indirect contact
● Resistance to fire and abnormal heat
○ IEC 60695-2-1, 650 ° C / 30 seconds (only for solid wall installation)
Indoor distribution box is a new indoor terminal distribution box product developed by Schneider Electric for the mid-to-high end commercial / civilian construction market. With simple lines and generous appearance, she has two choices of light and concealed installation. It can be widely used in apartments, villas, hotels, office buildings and other places. Provide a safe, reliable, coordinated and complete indoor low-voltage terminal power distribution solution, which is the best choice for real estate developers, disk factories and end users! ● Single row: 8 bits, 12 bits, 16 bits, 20 bits Multi-row: 24 bits (2 rows), 36 bits (3 rows) ● Rated current of the distribution box: single row 63A; 2 rows ~ 3 rows 125A ● Micro Curved transparent door / opaque door ○ Single row: box door opens 110 degrees upwards ○ Multiple rows: box door opens 180 degrees to the left or right ● Material ○ Plastic cover: insulated, environmentally friendly self-extinguishing material color: white RAL 9003 ○ Box composition-concealed: made of 1.0mm steel plate, with inner hemming design. The surface is treated with electrostatic spraying technology, which is sturdy and durable, has excellent corrosion resistance, and is suitable for concealed use. -Surface mounting: The main structure is made of 1.2mm steel plate, and the surface is treated by electrostatic spraying technology, which is durable and has excellent corrosion resistance; Row: ABS plastic side panels on the upper and lower sides of the box are more beautiful-knock-out tabs for extra positions, left and right 4 × 9mm- 12, 16, 20, 24, 36-bit distribution boxes can be installed separately Two zero rows ● Standard: Meets GB 17466-1998 ● Protection level ○ IEC 60529: IP 40 ○ Level 2 protection against indirect contact ● Fire and abnormal heat resistance ○ IEC 60695-2-1 standard, 650 ° C / 30 seconds (For solid wall installation only) Tianyi series surface-mounted / concealed electrical box model and order number type row digit model product number (18 mm / bit) concealed opaque door 1 8 TYA-08 136781 8 TYA-08-W 13678W (1) 1 12 TYA-12 136791 12 TYA-12-W 13679W (1) 1 16 TYA-16 136801 16 TYA-16-W 13680W (1) 1 20 TYA-20 136811 20 TYA-20-W 13681W ( 1) 2 24 TYA-24 136842 24 TYA-24-W 13684W (1) 3 36 TYA-36 136853 36 TYA-36-W 13685W (1) Type row number model number product number (18 mm / bit) concealed and transparent Door 1 8 TYA -08T 136861 8 TYA-08T-W 13686W (1) 1 12 TYA-12T 136871 12 TYA-12T-W 13687W (1) 1 16 TYA-16T 136881 16 TYA-16T-W 13688W (1) 1 20 TYA-20T 136891 20 TYA-20T-W 13689W (1) 2 24 TYA-24T 136902 24 TYA-24T-W 13690W (1) 3 36 TYA-36T 136943 36 TYA-36T-W 13694W (1) Type row number model product number (18 mm / bit) Surface-mounted opaque door 1 8 TYM-08 136951 12 TYM-12 136961 16 TYM-16 136971 20 TYM-20 136982 24 TYM-24 136993 36 TYM-36 13701 Type Row Number Model Number (18 mm / position) Surface mounted transparent door 1 8 TYM-08T 137051 12 TYM-12T 137061 16 TYM-16T 137111 20 TYM-20T 137152 24 TYM-24T 137163 36 TYM-36T 13720
Causes of electrical failures in distribution boxes
1.1 Failure caused by the influence of ambient temperature on low-voltage electrical appliances
The low-voltage electrical appliances in the distribution box are composed of fuses, AC contactors, residual current action protectors, capacitors, and meters. These low-voltage electrical appliances are designed and manufactured in accordance with GB1497 "Basic Standards for Low-Voltage Electrical Apparatus", and corresponding provisions are made for their normal working conditions: the upper limit of ambient air temperature does not exceed 40 ° C; the average value of ambient air temperature for 24h does not exceed 35 ° C ; The lower limit of the ambient air temperature is not lower than -5 ° C or -25 ° C.
The distribution box reconstructed by the rural power grid operates outdoors. It not only generates high temperature when it is directly exposed to sunlight, but also generates heat during operation. Therefore, in the high summer season, the temperature inside the box will reach above 60 ° C. The temperature greatly exceeds the ambient temperature specified by these appliances, and therefore failures due to overheating of electrical components in the distribution box can occur.
1.2 Faults Caused by Product Quality
During the reconstruction of the rural power grid at that time, due to the large number of distribution boxes required and the short construction period, the distribution box factory needed to supply the low-voltage electrical appliances in a short time and in a large number, which resulted in a strict demand for product quality, resulting Some products failed shortly after being put into operation. For example, some models of AC contactors cannot be operated because the contactor closing coil is burned out shortly after the distribution box is put into operation.
