BJB electrical components Germany BJB models BJB prices

BJB electrical components are sensor resistors whose resistance changes with temperature. According to different temperature coefficients, they are divided into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance of positive temperature coefficient thermistors increases as temperature rises, while the resistance of negative temperature coefficient thermistors decreases as temperature rises; both belong to semiconductor devices.

BJB electrical component principle

A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are the primary coil, secondary coil, and iron core (magnetic core). In electrical equipment and wireless circuits, it is commonly used for stepping voltage up or down, impedance matching, safety isolation, etc. In generators, whether the coil moves through a magnetic field or the magnetic field moves through a fixed coil, an electromotive force can be induced in the coil. In both cases, the value of the magnetic flux remains unchanged, but the amount of magnetic flux linking the coil varies; this is the principle of mutual induction. A transformer is a device that utilizes electromagnetic mutual induction to transform voltage, current, and impedance.

BJB electrical component types

1, Classification by mounting type: Thermocouples are widely used as the primary temperature measurement method, so there are various requirements for their mounting devices and technical performance. Therefore, thermocouple mounting devices are divided into six types: without mounting device, threaded type, fixed flange type, movable flange type, movable flange angle form, and tapered protection tube type. 9, Classification by assembly and structural style: According to the performance and structural style of thermocouples, they can be divided into detachable thermocouples, explosion-proof thermocouples, armored thermocouples, and spring-loaded fixed thermocouples for special purposes.

BJB electrical component requirements

1, Commonly used copper and aluminum rods for power cables are passed through one or several drawing dies using a wire drawing machine at room temperature, reducing their cross-section, increasing their length, and improving their strength. Wire drawing is the first process in wire and cable companies, and the primary process parameter is die matching skill. 2, Copper and aluminum single wires are heated to a certain temperature to improve the toughness and reduce the strength of the single wires 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. Based on the stranding method of the conductive core, it can be divided into regular stranding and irregular stranding. Irregular stranding is further divided into bundle stranding, concentric compound stranding, and special stranding. To reduce the occupied area of the conductor and the geometric size of the power cable, compacted methods are adopted during conductor stranding, changing the standard circular shape into semi-circular, sectoral, tile-shaped, and compacted circular shapes. This type of conductor is mainly used in power cables. 4, Plastic power cables mainly adopt extruded solid insulation layers. The deviation value of the insulation thickness of plastic insulation is an important indicator of the extrusion process level. Most product structural dimensions and their deviation values are clearly specified in standards. The surface of the plastic insulation layer must be smooth, without poor quality issues such as roughness, scorching, or impurities. The cross-section of the insulation layer must be dense and firm, with no visible pinholes or bubbles allowed. 5, Multi-core power cables generally need to be stranded into a circular shape to ensure form stability and reduce the cable profile. The mechanism of cabling is similar to conductor stranding; due to the larger lay length, non-back-twist methods are mostly adopted. Technical requirements for cabling include: first, preventing irregular insulated cores from flipping and causing cable twisting; second, avoiding scratches on the insulation layer. Most cables undergo two additional processes during cabling: filling, to ensure the roundness and stability of the cable after cabling; and binding, to ensure the cable core does not loosen. 6, To protect the insulated cores from being damaged by armor, appropriate protection is required for the insulation layer. Inner sheaths are divided into extruded inner sheaths (separator sleeves) and wrapped inner sheaths (bedding). Wrapped bedding replaces binding tapes and is performed synchronously with the cabling process. 7, For power cables laid underground that may withstand certain positive pressure during operation, an inner steel tape armor structure can be selected. For power cables laid in locations subject to both positive pressure and tensile forces (such as in water, vertical shafts, or soil with significant elevation differences), structures with inner steel wire armor should be selected. 8, The outer sheath is the structural part that protects the insulation layer of the power cable from environmental corrosion. The main functions of the outer sheath are to improve the mechanical strength of the power cable, provide chemical corrosion resistance, moisture proofing, water ingress prevention, and flame retardancy. Depending on the different requirements for power cables, plastic sheaths are directly extruded using an extruder.

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