In power distribution equipment such as voltage distribution cabinets and switchgear at all levels of power plants and substations, the conductors connected between large electrical equipment such as generators and transformers and various electrical equipment are called busbars. Busbars, also known as busbars, are used to collect, distribute, and transmit electrical energy. There are two kinds of bus connection methods for bus bar connection and double bus connection, and today Shanxi power distribution cabinet manufacturer Jin Taiheng will tell you about the advantages and disadvantages of single bus connection.
1. Soft start function
The hard start of the motor has a severe impact on the power grid, and will also require too high the capacity of the power grid, and the large current and vibration that occur during the start will cause great damage to the baffle and valve, and the service life of the equipment and pipeline will be extremely unlucky. After the use of inverter energy-saving equipment, the soft start function of the inverter will make the starting current start from zero, and the maximum value will not exceed the rated current, which reduces the impact on the power grid and the requirements for power supply capacity, and prolongs the service life of equipment and valves. The maintenance cost of the equipment is saved.
At the beginning of the birth of the inverter, it is for the most widely used three-phase asynchronous squirrel cage motor to do, the speed formula of the three-phase asynchronous motor is n=60f(1-s)/p, after changing the input frequency of the motor, and then changing the speed of the motor is the most thorough, most convenient and reliable way. The instantaneous current of the motor direct start is 6-8 times of the normal and stable operation, and the step-down start is 4-5 times, and the frequency conversion speed regulation will not exceed 1.5 times the rated current of the inverter, whether it is the impact on the power grid, or the adaptability of the equipment, its advantages are clear and clear.
2. Stepless speed regulation
Stepless speed regulation, is no grade and no step speed regulation, from zero speed start to speed, and from speed to zero speed, in one go, the speed curve is continuous, smooth and stable, which greatly adapts to the load inertia, improves the adaptability of multiple mechanical equipment to each other, improves the production power, greatly reduces the mechanical conflict, oscillation and noise, prolongs the life of the equipment, and reduces the maintenance cost. The output frequency of ordinary inverters is about 0.00Hz-400.00Hz, the frequency resolution is 0.01Hz, some reach 650.00Hz, and the output of high-frequency inverters can reach 5000Hz, which has completely covered all the scale of industrial speed regulation.
Before the birth of the inverter, we now have many mechanical speed regulation methods, which can be seen everywhere in our daily life, such as large and small gears, belts, reducers, etc., and these speed regulation methods can only output a fixed proportion of speed each time, and it is not so simple to change the speed frequently, of course, there are slip motor methods, but after all, the scale of use is limited, and the maintenance and cost are higher. With the presentation of central components such as transistors and microprocessor chips, we will promote a major breakthrough in stepless speed regulation technology. The birth of the inverter is the result of adapting to the needs of the level of industrial automation and the development of a number of related industries.
3. Frequency conversion function
In order to ensure the reliability of production, all kinds of production machinery are designed with power drive, there is a certain amount of surplus. When the motor cannot run at full load, in addition to meeting the requirements of power drive, the excess torque adds the consumption of active power, forming a waste of electric energy. The traditional speed regulation method of fans, pumps and other equipment is to adjust the air volume and water supply through the baffle plate and valve opening of the inlet or outlet, and the input power is large, and a lot of energy is consumed in the interception process of the baffle and valve. When using frequency conversion speed regulation, if the flow requirement is reduced, the speed through the descending pump or fan can meet the requirements. Take the example of energy saving of fan pump load: a centrifugal pump motor has a power of 55 kilowatts, when the speed drops to 4/5 of the original speed, its power consumption is 28.16 kilowatts, saving 48.8%, and when the speed drops to l/2 of the original speed, its power consumption is 6.875 kilowatts, saving 87.5%.
The energy-saving function of the inverter has been widely used in various industrial and civil development days, especially when the inverter is used for square torque loads, such as fans, fans, pumps, and propeller loads, which are determined by the torque curve of such loads. At low speed, because the flow rate of the fluid is low, the load torque is very small, and with the increase of the motor speed, the flow rate increases, and the load torque and power are also increasing.
Fourth, equipment and self-maintenance function
As we all know, in the actual equipment operation process, there are often a variety of factors leading to a variety of faults and equipment damage, if you can carry out intelligent detection, and active alarm and maintenance, it will be very necessary, such as undervoltage, overvoltage, lightning, overload, load stall, temperature is too high, communication problems, electromagnetic disturbance, power supply phase loss, motor phase loss, load short circuit, grounding short circuit, etc., some problems are fatal, once presented, the consequences are unimaginable.
In the process of research and development, the inverter is mainly for the safety of the internal equipment of the inverter itself, and multiple tests and maintenance are added, such as the promised maximum current of the inverter module will generally not exceed 2 times of the rating, the temperature of the electrolytic capacitor is 85 °C, the electromagnetic compatibility design, etc., coupled with the detection and response of the load side (such as motor temperature detection and maintenance, instantaneous power failure without stopping, etc.), making today's inverter highly intelligent, not only to maintain its own safety and normal operation, It also greatly maintains the safe operation of the front and rear equipment.
5. Power factor compensation function
Reactive power not only adds line loss and equipment heating, but also the decline of power factor leads to the decline of active power of the power grid.
After using the frequency conversion speed regulation equipment, because of the effect of the internal filter capacitor of the frequency converter, the reactive power loss is reduced and the active power of the power grid is added.
6. Automatic control function
The control function of today's inverter is now very complete, and it can cooperate well with other control equipment and instruments to realize centralized real-time monitoring and control of systematic networking, such as cooperative DCS, PLC, sensors, HMI, CNC, host computer, servo drive, etc., which greatly improves the degree of automation of the production line, saves manpower and material resources, improves power, and reduces cost. For example, the inverter can have a variety of frequency given methods, such as digital setting, potentiometer, external analog (0-10V, 4-20mA), multi-section speed, PID and other methods, can be equipped with a variety of controllers, frequency instructions of response signals, remote/local control switching, convenient for a variety of control needs of users, and some companies have continuously launched a variety of professional special aircraft, for some subdivided professional users to carry out personalized customized development, integrated development, for users to save the troublesome selection of system compatibility problems, saving money.
Inverter is an important member of the field of industrial automation. With the rapid development of China's automated chemical industry, the product function and stability of China's inverter brand have surpassed many foreign brands in some aspects, and the market share of domestic brands has gradually increased.
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