pollmann electrical components, German pollmann models, pollmann prices

pollmann electrical components are electronic devices made from semiconductor materials (such as silicon, selenium, and germanium). A diode has two electrodes: the positive electrode, also called the anode, and the negative electrode, also called the cathode. When a forward voltage is applied across the two terminals of the diode, it conducts; when a reverse voltage is applied, it blocks current. The conduction and blocking states of a diode are equivalent to the closing and opening of a switch. Diodes exhibit unidirectional conductivity, with current flowing from the anode through the device to the cathode during conduction. As one of the earliest semiconductor devices, diodes are widely used. Particularly in various electronic circuits, reasonable connections using diodes along with resistors, capacitors, inductors, and other components form circuits with different functions, enabling AC rectification, demodulation of modulated signals, limiting and clamping, and voltage stabilization of power supplies.

pollmann Electrical Component Characteristics

Sensitivity refers to the ratio of the change in output to the change in input of a sensor under steady-state operating conditions. It is the slope of the output-input characteristic curve. If the relationship between the sensor's output and input is linear, then the sensitivity S is a constant. Otherwise, it varies with changes in the input quantity. The dimension of sensitivity is the ratio of the dimensions of the output and input quantities. When the dimensions of the sensor's output and input quantities are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity yields higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range, and stability often deteriorates.

pollmann Electrical Component Characteristics

Under normal circumstances, the actual static characteristic output of a sensor is a curve rather than a straight line. In practical applications, to ensure uniform scale readings on instruments, a fitted straight line is commonly used to approximate the actual characteristic curve. Linearity (non-linear error) is a performance indicator of this degree of approximation. There are various methods for selecting the fitted straight line. For example, the theoretical straight line connecting the zero-input point and the full-scale output point can be used as the fitted line; alternatively, the theoretical straight line that minimizes the sum of squared deviations from all points on the characteristic curve is used, known as the least-squares fitted line.

pollmann Electrical Component Requirements

1、Commonly used copper and aluminum rods for power cables are drawn through one or more drawing dies at room temperature 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 companies, and the primary technical parameter of this process is die matching. 2、Copper and aluminum single wires are heated to a specific temperature to improve their toughness and reduce their 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 can be classified into regular stranding and irregular stranding. Irregular stranding includes bunch stranding, concentric composite stranding, and special stranding. To reduce the occupied area of the conductor and minimize the geometric size of the power cable, compacted stranding is used during the stranding process, 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-insulated power cables mainly use extruded solid insulation layers. The tolerance of the insulation thickness is an important 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, without 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 cable profile. The stranding mechanism is similar to that of conductor stranding, but due to the larger lay length, non-back-twist methods are mostly used. Technical requirements for cabling include: preventing twisted insulation cores from causing cable torsion, and avoiding damage to the insulation layer. During cabling, two additional processes are usually performed simultaneously: filling, to ensure the cable remains round and stable after cabling; and binding, to keep the cable core tight. 6、To protect the insulated cores from being damaged by armor, appropriate protection is applied to the insulation layer. Inner sheaths are divided into extruded inner sheaths (separation sleeves) and wrapped inner sheaths (cushioning layers). Wrapped cushioning layers replace binding tapes and are applied synchronously with the cabling process. 7、For power cables installed underground, which may withstand certain positive pressure during operation, an internal steel tape armor structure can be selected. For installations subject to both positive pressure and tensile forces (such as in water, vertical shafts, or soil with significant elevation differences), a structure with internal steel wire armor should be chosen. 12、The outer sheath is the structural component that protects the insulation layer of the power cable from environmental corrosion. Its main functions are to enhance the mechanical strength of the cable, provide resistance to chemical corrosion, moisture, water ingress, and prevent combustion. Depending on specific requirements, plastic sheaths are directly extruded onto the cable using an extruder.

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