Smart capacitors

Intelligent capacitors integrate advanced technologies such as modern measurement and control, power electronics, network communication, automation control, and power capacitors. Changing the outdated controller technology of traditional reactive power compensation devices and the outdated mechanical contactors or electromechanical integrated switches as capacitor switching technology, changing the bulky and cumbersome structural mode of traditional reactive power compensation devices, thus making the new generation of low-voltage reactive power compensation equipment have better compensation effects, smaller size, lower power consumption, lower price, more cost savings, more flexible use, and more convenient maintenance, The characteristics of longer service life and higher reliability adapt to the higher requirements of modern power grids for reactive power compensation.

Ordinary capacitors

Two conductors that are close to each other, with a layer of non-conductive insulating medium sandwiched between them, form a capacitor. When a voltage is applied between the two plates of a capacitor, the capacitor will store charge. The capacitance of a capacitor is numerically equal to the ratio of the charge on one conductive plate to the voltage between two plates. The basic unit of capacitance of a capacitor is Farad (F). In circuit diagrams, the letter C is usually used to represent capacitive components. [1] Capacitors play an important role in circuits such as tuning, bypass, coupling, and filtering. The tuning circuit of transistor radios requires it, as well as the coupling circuit and bypass circuit of color televisions. [1] With the rapid development of electronic information technology, the speed of updating and upgrading digital electronic products is getting faster and faster. The production and sales of consumer electronic products, mainly flat panel TVs (LCD and PDP), laptops, digital cameras, and other products, continue to grow, driving the growth of the capacitor industry.

Reactive power compensation capacitor

Intelligent capacitors are intelligent reactive power compensation devices that integrate advanced technologies such as modern measurement and control, power electronics, network communication, automation control, and power capacitors. Intelligent reactive power compensation capacitors have changed the outdated control technology of traditional reactive power compensation devices and the outdated mechanical contactors or mechatronic integrated switches as the switching technology for capacitors. They have also changed the bulky and bulky structural mode of traditional reactive power compensation devices, making the new generation of low-voltage reactive power compensation equipment more effective in compensation, smaller in size, lower in power consumption, lower in price, more cost-effective, and more flexible in use, The characteristics of more convenient maintenance, longer service life, and higher reliability meet the higher requirements of modern power grids for reactive power compensation.

Switching switch

In order to reduce the surge current when capacitors are put into operation, people have invented the CJ19 series dedicated contactors for switching capacitors. The basic principle of this type of device is to use a current limiting resistor to first connect to the circuit to pre charge the capacitor, thereby reducing the voltage difference between the power supply and the capacitor. Then, the main contact will short-circuit the current limiting resistor. This type of device can usually reduce the surge current to less than 5 times, but the arc is inevitable when cutting off the capacitor, so the requirements for the docking point are high to ensure sufficient service life.

Reactor

Reactors, also known as inductors, generate a magnetic field within a certain range of space occupied by a conductor when it is energized. Therefore, all current carrying electrical conductors have a general sense of inductance. However, the inductance of a long and straight conductor is relatively small, and the magnetic field generated is not strong. Therefore, the actual reactor is a wire wound in the form of a solenoid, called a hollow reactor; Sometimes, in order to increase the inductance of this solenoid, an iron core is inserted into the solenoid, which is called an iron core reactor. Reactance is divided into inductive reactance and capacitive reactance. A more scientific classification is that inductive reactance (inductor) and capacitive reactance (capacitor) are collectively referred to as reactors. However, due to the existence of inductors in the past, which were called reactors, capacitors are now referred to as capacitive reactances, and reactors specifically refer to inductors.

Complete compensation device

The compensation complete set device uses a controller to track the changes in the reactive load of the system, selects power factor or reactive power as the judgment basis, automatically and reasonably switches, reduces the number of switching times, and avoids the problems of switching oscillation and reactive power backflow. So as to maintain the power factor of the system at its optimal state. The switching switch can be selected from any of the capacitor specific contactor switching, thyristor switch switching, or intelligent composite switch switching methods, meeting the requirements of different power grid environments for switching switches.

Quality

The issue of power quality has been raised for a long time, in the early stages of power system development! The composition of power load is relatively simple, mainly composed of linear loads such as synchronous motors, asynchronous motors, and various lighting equipment. Therefore, the indicators for measuring power quality are also relatively simple, mainly including frequency offset and voltage offset. Since the 1980s, with the development of power electronics technology, nonlinear power electronic devices and devices have been widely used in modern industry. At the same time, in order to solve the problems existing in the development of the power system itself, DC transmission and FACTS technology are constantly being applied in practical engineering! Speed regulating motors and reactive power compensation capacitors have also been put into operation in large quantities. The operation of these devices leads to increasingly severe distortion of voltage and current waveforms in the power grid, and the level of harmonics continues to rise. In addition, impulsive and fluctuating loads, such as electric arc furnaces, large steel mills, electric locomotives, etc., not only generate a large number of high-order harmonics during operation, but also cause voltage fluctuations, flicker, three-phase imbalance and other power quality problems. On the other hand, with the increasing popularity of various complex, precise, and sensitive electrical equipment for power quality, people's requirements for power quality are becoming higher and higher, making power quality a current research hotspot.

High and low voltage accessories