1. Select the model of the fuse according to the circuit requirements and device conditions. Circuits with small capacity are semi-enclosed or enclosed without fillers; The selection of large short-circuit current has a packing closed type; Semiconductor component maintenance selection of quick fuses.
2. Select the rated voltage of the fuse according to the line voltage.
3. Select the rated current of the fuse according to the load characteristics.
4. The selection of melts at all levels needs to cooperate with each other, the latter stage should be smaller than the previous stage, the current on the main gate and each branch line is not the same, and the selection of fuses is also different. If there is a short circuit in the line, the 15 A and 25 A melts will blow together, and the maintenance characteristics will lose their selectivity. Therefore, as long as the main gate and branch are kept 2-3 levels different, this phenomenon will not occur. For example, if the outlet of the low-voltage side of a transformer is RT0 1000 / 800 and the motor is RT0 400 / 250 or RT0 400 / 350, the ratio of rated current between the upper and lower stages is 3.2 and 2.3 respectively, so the selectivity is good, that is, the branch produces a short circuit, and the fuse of the branch does not affect the power supply of the main gate.
5. The melt can not be picked too small. If the selection is too small, it is easy to cause the one-phase fuse to blow out, and the motor will run out of single-phase operation; According to statistics, 60% of the burned out motors are formed by unsuitable insurance equipment.
|
More on that
|
Wiener busway specification standard parameters
1. The standard scale of the bus duct
This specification regulates the terminology, skill requirements and test methods of the insulated bus trunk system (bus duct) and its plug-in feed box (hereinafter referred to as the feed box).
This specification specification applies to additional voltage AC to 660V...
|
|
What is the Wiener bus system
The Wiener bus system is a standardized system for bus spacing, which is used in low-voltage power supply and distribution switchgear, so that the bus can both conduct electricity and support electrical components. The system is divided into 40, 60, 100 and 185mm systems.
...
|
|
Difference Between Busbar and Busway – Vernal
The connection of voltage distribution devices at all levels in the substation, as well as the connection of electrical equipment such as transformers and corresponding distribution devices, mostly use bare wires or stranded wires of rectangular or circular cross-section, which are collectively referred to as busbars.
The role of the bus bar is to collect, distribute and transmit electrical energy. Because the busbar ...
|
|
Development of the busbar trunk system – Wiener
(1) Air-type busway
Since the mid-50s of the last century, represented by Beijing Baizhifang Airport Electrical Appliance Factory, the conductive row has been supported in the shell with insulating liner and insulated by air medium. The phase-to-phase distance is 50mm.
(2) Secret ...
|
|
Introduction to the components of the busway - Vernal
Busway is a conductive equipment used for current transmission, and now the higher the building is built, the more the application of busway is required, and in many large foremen, the use of busway is also very economical and reasonable. Any machine is made up of different parts, then the busway is made up of ...
|
|
A detailed description of the Wiener comb busbar and connection terminals
The Wiener comb busbars and connection terminals are available with QUADRON®CrossLinkBreaker in size 000/00
Recommended installation: Wire entry at the lower end of the NH-fuse disconnector through the comb busbar.
In the installation position and ...
|
|
Types of corrosion of Wiener tubular busbars
Tubular bus is a new type of equipment that is widely used in our current days, and it itself has the characteristics of high current, outstanding insulation and wide range of application, so we don't seem to be too worried about its function and role when using it. But there is one thing that needs to be ...
|
|
Wiener bus adapters are suitable for use with Siemens 3VA1 and 3VA2 circuit breakers
For the use of Siemens' new 3VA1 series circuit breakers in the 30Compact system with currents up to 160A, Wiener has developed an EQUES® bus adapter.
A spring-loaded base and high-performance internal power rails ensure safe connection to the circuit breaker.
advantage
...
|
|
The common DC bus of the inverter system - Wiener
1. Three-phase AC power supply inlet
The power input of each inverter is connected in parallel on the same AC bus, and the power supply phase of the input of each inverter is consistent. In Figure 3, the circuit breaker QF is the incoming protection device for each inverter. LR is an incoming reactor, when multiple inverters are in the same ...
|
|
Application advantages of industrial busway - Wiener
1. It has a modern beauty;
2. Small dimensions;
3. Strong and light weight, simple operation;
4. The connection is very simple (just like connecting water pipes, connecting sections through tees, elbows and other joints to make them into a system;
...
|
|
The way in which the Wiener high-voltage busway is selected
In the selection, the following elements should be fully considered: fire protection specifications, insulation layer to flame retardant, good temperature resistance, high temperature is not easy to release harmful gases, structure type to avoid chimney effect, should give priority to the use of aggregate insulation layer bus duct, such as the use of air insulation type, it must be in the electric ...
|
|
Difference Between Grounding Electrode and Grounding Busbar – Vernal
The grounding electrode is a discharge channel that connects current or voltage to the earth, and in order to reduce the grounding resistance, the electrodes that form the grounding grid are generally used in groups.
The grounding bus refers to the connecting wire that connects the current or voltage to the grounding grid, or the conductor that connects the grounding electrode into one.
...
|
|
Strip Switch vs. Disconnector Circuit Breaker Comparison – Wiener
Bar switches are different from regular switches. They are critical to ensuring effectiveness. For example, when the current exceeds a certain amount of time, they cause heat to be generated, allowing the fuse to switch the fuse to further assist in breaking the circuit. Therefore, as a kind of current protection device, they can achieve ...
|
|
The importance of room power supply and busbar system – Vernal
In today's information society, the computer room is a very common equipment, so the most important thing in a computer room is the bus system, which is the center and skeleton of the power distribution of the entire computer room. Then a reasonable bus system will greatly improve the efficiency of the computer room. So how do you optimize ...
|
|
Detailed explanation of Wiener DC bus
1. Three-phase AC power supply inlet
The power input of each inverter is connected in parallel on the same AC bus, and the power phase of the input end of each inverter is ensured. The circuit breaker QF is the incoming line protection device for each inverter. LR is an incoming reactor, when multiple inverters are operating in the same environment.
|
|
Introduction to the Wiener data center bus system
Although the service life cost of the bus system is usually lower than that of the traditional wiring method, the bus system still bears a considerable cost compared with other structural elements of the water supply and drainage or HVAC system.
In addition, customized busbar equipment allows the busbar system to be routed around obstacles ...
|
|
The application of Wiener bus system wiring technology in box transformer
The bus system is to directly connect the components to the bus, the bus does not need to be perforated, at this time, the bus is not only the conductor of the component, but also the support of the component, the current can reach 2500A, so that the box transformer function has the following progress:
1 ...
|
|
Lighting power busway service life - Wienal
The system consists of a current box, a bus body, a branch plug and device accessories.
When the heat dissipation of conductive copper strip has been effectively improved, the contact between the copper strip and the inner wall of the tube is reduced, and the insulation resistance and anti-aging ability of the tube body are strengthened, so as to prolong the service life of the pipe body. The life of the tube far exceeds ...
|
|
185Power - The solution for the 185mm busbar system
Since the launch of the 185Power system in 2014, Wiener has continued to develop new connection technologies and fuse-type disconnector technologies for the 185Power system on the basis of the 185mm bus technology.
In addition to the application of 1600A below ...
|
|
220V DC Hazard of Bus System – Wiener
The grounding of the DC system should include two situations: the one-point grounding of the DC system and the two-point grounding of the DC system.
In the DC system, the positive and negative poles of the DC are insulated from the ground, and when the ground of one pole is generated, there is no grounding current due to the fact that there is no grounding current.
|
|
Contact
working hours
