petitjean electrical components Germany petitjean model petitjean price

petitjean electrical components refer to lightning arrestor tubes or antenna switch tubes used for overvoltage protection. The tube contains two or more electrodes and is filled with a certain amount of inert gas. A gas discharge tube is a gap-type lightning protection component used in the lightning protection of communication systems. Gas discharge tubes are gap-type lightning protection components that have been widely applied in the lightning protection of communication systems. Discharge tubes are commonly used in the first stage or the first two stages of multi-stage protection circuits to discharge instantaneous lightning overcurrents and limit overvoltages. Due to the very high inter-electrode insulation resistance and very small parasitic capacitance of the discharge tube, it has clear advantages for lightning protection of high-frequency signal lines. The main disadvantages of the discharge tube's protection characteristics are its large discharge delay and less-than-ideal operating sensitivity, making it difficult to effectively suppress lightning waves with a steep wavefront rise. There is also a follow-current issue in the lightning protection of power systems. Commonly used gas discharge tubes include two-electrode and three-electrode discharge tubes. Their encapsulation housing material is mostly ceramic, hence they are called ceramic discharge tubes.

petitjean electrical component classification

Printed circuit boards are divided into three major categories based on the number of layers: single-sided boards, double-sided boards, and multilayer boards. First is the single-sided board. On the most basic PCB, components are concentrated on one side, while conductors are concentrated on the other side. Because conductors appear only on one side, this type of PCB is called a single-sided printed circuit board. Single-sided boards are usually simple to manufacture and low in cost, but their disadvantage is that they cannot be applied to overly complex products. Double-sided boards are an extension of single-sided boards. When single-layer routing cannot meet the needs of electronic products, double-sided boards must be used. Both sides have copper cladding and traces, and vias can be used to connect circuits between the two layers, forming the required network connections. Multilayer boards refer to printed boards formed by laminating more than three conductive graphic layers separated by insulating materials, with the conductive graphics interconnected as required. Multilayer printed circuit boards are the product of the development of electronic information technology towards high speed, multi-functionality, large capacity, small volume, thin profile, and lightweight. Based on characteristics, circuit boards are divided into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB).

petitjean electrical component applications

Inductors mainly play roles such as filtering, oscillation, delay, and notch filtering in circuits. They also function in signal selection, noise filtering, current stabilization, and suppression of electromagnetic interference. The most common role of an inductor in a circuit is to form an LC filter circuit together with a capacitor. Capacitors have the characteristic of 'blocking DC and passing AC,' while inductors have the function of 'passing DC and blocking AC.' If DC electricity accompanied by many interference signals passes through an LC filter circuit, the AC interference signals will be converted into heat energy by the inductor and consumed. When the relatively pure DC current passes through the inductor, the AC interference signals within it are also converted into magnetic induction and heat energy. Higher frequencies are most easily impeded by the inductor's impedance, which allows for the suppression of higher-frequency interference signals. Inductors have the characteristic of blocking AC while allowing DC to pass smoothly; the higher the frequency, the greater the coil impedance. Therefore, the main functions of inductors are to isolate and filter AC signals, or to form resonant circuits with capacitors, resistors, and other components.

petitjean electrical component requirements

1、Commonly used copper and aluminum rods for power cables are drawn at ambient temperature through one or several drawing dies using a wire drawing machine, reducing their cross-sectional area, increasing their length, and improving their strength. Wire drawing is the first process in wire and cable manufacturing, and the key technical parameter is die matching. 2、Copper and aluminum single wires are heated to a specific temperature to improve toughness and reduce strength through recrystallization, meeting the requirements for conductive cores in wires and cables. The key to the annealing process is to prevent oxidation of the copper wires. 3、To improve the flexibility of power cables for easier installation, the conductive core is made by stranding multiple single wires. Stranding methods are classified into regular stranding and irregular stranding. Irregular stranding includes bunch stranding, concentric composite stranding, and special stranding. To reduce the occupied area and geometric dimensions of the power cable, compacted stranding is applied to the conductor, transforming the standard circular shape into semi-circular, sector-shaped, tile-shaped, and compacted circular shapes. This type of conductor is primarily used in power cables. 4、Plastic power cables mainly use extruded solid insulation layers. The tolerance of the insulation thickness is a key indicator of the extrusion process quality. Most product structural dimensions and their tolerances are clearly specified in standards. The surface of the plastic insulation layer must be smooth, free from defects such as roughness, scorching, or impurities. The cross-section of the insulation layer must be dense and robust, with no visible pinholes or bubbles. 5、Multi-core power cables are generally stranded into a circular shape to ensure form stability and reduce the overall profile. The stranding mechanism is similar to conductor stranding; due to the larger lay length, non-back-twist methods are mostly used. Technical requirements for cabling include: preventing twisted insulation cores from overturning and causing cable torsion, and avoiding damage to the insulation layer. During cabling, two additional processes are usually performed: filling, to ensure the cable remains round and stable; and binding, to keep the cable core tight. 6、To protect the insulated cores from damage by the armor, an appropriate inner sheath is required. Inner sheaths are classified into extruded inner sheaths (separator sleeves) and wrapped inner sheaths (cushioning layers). Wrapped cushioning layers replace binding tapes and are applied simultaneously with the cabling process. 7、For power cables laid underground that may withstand certain positive pressure, an internal steel tape armor structure can be selected. For locations subject to both positive pressure and tensile forces (such as underwater, in vertical shafts, or in soil with significant elevation changes), a structure with internal steel wire armor should be selected. 17、The outer sheath is the component that protects the cable's insulation layer from environmental corrosion. Its main functions are to improve the mechanical strength of the power cable, provide resistance to chemical corrosion, moisture, water ingress, and prevent combustion. Depending on the specific requirements for the power cable, a plastic sheath is directly extruded using an extruder.

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