nexans electrical components Germany nexans model nexans price

nexans electrical component is a transducer that converts guided waves propagating on a transmission line into electromagnetic waves propagating in an unbounded medium (usually free space), or performs the reverse conversion. It is the component used in radio equipment to transmit or receive electromagnetic waves. Engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, and radio astronomy, which use electromagnetic waves to transmit information, all rely on antennas for operation. In addition, in terms of transmitting energy using electromagnetic waves, non-signal energy radiation also requires antennas. General antennas are reversible, meaning the same antenna can be used as both a transmitting antenna and a receiving antenna. The basic characteristic parameters of the same antenna for transmission or reception are identical. This is the reciprocity theorem of antennas. As we know, radio equipment such as communication, radar, navigation, broadcasting, and television devices transmit information via radio waves and require the radiation and reception of radio waves. In radio equipment, the device used to radiate and receive radio waves is called an antenna. The antenna provides the necessary coupling between the transmitter or receiver and the medium through which radio waves propagate. Like the transmitter and receiver, the antenna is also an important component of radio equipment.

nexans electrical component characteristics

The main characteristics of circuit breakers include: rated voltage; rated current; tripping current setting range for overload protection and short-circuit protection; rated short-circuit breaking current, etc. Rated ultimate short-circuit breaking capacity refers to the ability of a low-voltage circuit breaker to operate normally again and break this short-circuit current once more after breaking the maximum three-phase short-circuit current at its output terminals; the circuit breaker does not guarantee whether it can normally connect and break thereafter. Rated service short-circuit breaking capacity refers to the ability of the circuit breaker to break normally multiple times when the maximum three-phase short-circuit current occurs at its output terminals. Rated service short-circuit breaking capacity is a breaking current value lower than the rated ultimate short-circuit breaking current. Generally, circuit breakers with three-stage protection functions—long-time delay for overload, short-time delay for short-circuit, and instantaneous action for short-circuit—can achieve selective protection. Most main lines (including the output terminals of transformers) use them as main protection switches. Circuit breakers without short-time delay for short-circuit function (only having long-time delay for overload and instantaneous action for short-circuit, i.e., two-stage protection) cannot provide selective protection and can only be used in branch circuits. "Marine Electrical Engineering" points out that for circuit breakers with three-stage protection, emphasis is placed on their service short-circuit breaking capacity value, while for circuit breakers used in branch lines, it is essential to ensure they have sufficient ultimate short-circuit breaking capacity value. A common bias is to prefer larger values rather than appropriately matched ones, believing that larger is safer. However, selecting excessively large values causes unnecessary waste. Therefore, there is no need for circuit breakers on branch lines to blindly pursue high service short-circuit breaking capacity indicators. For circuit breakers used on main lines, they must not only meet the requirements for rated ultimate short-circuit breaking capacity but also satisfy the requirements for rated service short-circuit breaking capacity. A circuit breaker is a basic low-voltage electrical appliance with overload, short-circuit, and undervoltage protection functions, capable of protecting lines and power sources. The main technical indicators are rated voltage and rated current. Circuit breakers have different functions depending on the application, with many varieties and specifications, and numerous specific technical indicators. Free tripping of circuit breakers: If the protection action closes the tripping circuit at any moment during the closing process of the circuit breaker, the circuit breaker can reliably disconnect completely; this is called free tripping. Circuit breakers with free tripping can ensure rapid disconnection when a short-circuit fault occurs during closing, thereby preventing the expansion of the accident scope.

nexans electrical component principle

Electrodynamic loudspeakers, also known as moving-coil loudspeakers, are electroacoustic transducers based on the electrodynamic principle. They are the most widely used loudspeakers, primarily for three reasons: 1. Electrodynamic loudspeakers have a simple structure, are easy to manufacture, and do not require large space, resulting in low prices and widespread adoption. 2. These loudspeakers can achieve excellent performance, obtaining uniform frequency response in the mid-frequency range. 3. These loudspeakers are continuously improving; decades of loudspeaker development history reflect continuous improvements in design, craftsmanship, and materials, as well as performance advancements over time. Electrodynamic loudspeakers are mostly cone-shaped or dome-shaped. The structure of a cone loudspeaker can be divided into three parts: 1. The vibration system includes the diaphragm, voice coil, centering spider, dust cap, etc. 2. The magnetic circuit system includes the upper pole piece, pole piece, lower pole piece, magnet, etc. 12. The auxiliary system includes the basket, surround, terminal board, and phase plug. According to Faraday's law, when a current-carrying conductor passes through a magnetic field, it experiences an electromagnetic force whose direction conforms to Fleming's left-hand rule. The force is perpendicular to both the current and the magnetic field directions, and its magnitude is proportional to the current, wire length, and magnetic flux density. When an alternating audio current is input to the voice coil, the voice coil experiences an alternating driving force, producing alternating motion that drives the paper cone to vibrate, repeatedly pushing air to produce sound.

nexans electrical component parameters

(1) Nominal capacitance is the capacitance marked on the capacitor. However, there is a deviation between the actual capacitance and the nominal capacitance. The accuracy class corresponds to the allowable error. General capacitors commonly use classes I, II, and III, while electrolytic capacitors use classes IV, V, and VI to indicate capacitance precision, selected according to the application. The capacitance value of an electrolytic capacitor depends on the impedance presented during operation under AC voltage. The capacitance value changes with variations in operating frequency, temperature, voltage, and measurement methods. The unit of capacitance is F (Farad). Since a capacitor is a "container" for storing electric charge, the issue of "capacity" size arises. To measure the ability of a capacitor to store electric charge, the physical quantity of capacitance is defined. A capacitor can only store electric charge under the influence of an applied voltage. Different capacitors may store different amounts of charge under voltage. Internationally, it is uniformly stipulated that when a DC voltage of 1 volts is applied to a capacitor, the amount of charge it can store is defined as the capacitance of that capacitor (i.e., the charge per unit voltage), represented by the letter C. The basic unit of capacitance is the Farad (F). (2) Rated voltage is the maximum DC voltage that can be continuously applied to the capacitor at the minimum and rated ambient temperatures. If the working voltage exceeds the capacitor's withstand voltage, the capacitor will break down, causing damage. In practice, as the temperature rises, the withstand voltage decreases. (3) Insulation resistance. When DC voltage is applied to a capacitor, a leakage current is generated. The ratio between the two is called insulation resistance. When the capacitance is small, its value mainly depends on the surface state of the capacitor. Generally, the higher the insulation resistance, the better. (4) Loss. The energy consumed by heating per unit time under the action of an electric field is called loss. Loss is related to frequency range, dielectric material, conductivity, and the resistance of the metal parts of the capacitor. (8) Frequency characteristics. As the frequency increases, the capacitance of general capacitors tends to decrease. When the capacitor operates below its resonant frequency, it exhibits capacitive behavior; when it exceeds its resonant frequency, it exhibits inductive behavior, acting as an inductor rather than a capacitor. Therefore, it is essential to avoid operating the capacitor above its resonant frequency.

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