08/8/2 In stock German 08/8/2 electrical components 08/8/2 inventory

08/8/2 Electrical components are devices that use the principle of electromagnetic induction to change AC voltage. The main components are the primary winding, secondary winding, and iron core (magnetic core). Main functions include: voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer). Transformers can be classified by application into: distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type substation test transformers, phase-shifting transformers, high-current transformers, excitation transformers, etc.

08/8/2 Electrical component composition

Circuit breaker internal accessories: Auxiliary contacts are contacts mechanically linked to the opening and closing mechanism of the circuit breaker's main circuit. They are mainly used to display the open/closed status of the circuit breaker. Connected in the control circuit of the circuit breaker, they implement control or interlocking of related electrical appliances through the opening and closing of the circuit breaker. Alarm contacts are used for circuit breaker accident alarms. These contacts only operate after the circuit breaker trips and opens. They are mainly used when the circuit breaker load experiences faults such as overload, short circuit, or undervoltage, causing free tripping. The alarm contact switches from its normally open position to a closed position, connecting indicator lights, electric bells, buzzers, etc., in the auxiliary circuit to display or alert to the circuit breaker's fault trip status. Since the probability of free tripping due to load faults is not high. Shunt release: A shunt release is a release excited by a voltage source, and its voltage is independent of the main circuit voltage. A shunt release is an accessory for remote opening operation. When the power supply voltage is any value between 70% and 110% of the rated control power supply voltage, the circuit breaker can reliably open. The shunt release operates on a short-time duty cycle; the coil energization time generally must not exceed 4S, otherwise the coil will burn out. To prevent coil burnout in molded case circuit breakers, a microswitch is connected in series with the shunt release coil. When the shunt release attracts via the armature, the microswitch switches from normally closed to normally open. Since the control circuit for the shunt release power is cut off, even if the button is manually held down, the shunt coil will not be energized, thus avoiding coil damage. After the circuit breaker is reset and closed, the microswitch returns to the normally closed position. Undervoltage release: An undervoltage release is a device that causes the circuit breaker to open with or without delay when its terminal voltage drops to a specified range. Under thermal conditions, it must ensure reliable closing of the circuit breaker. Therefore, when a certain voltage drop occurs in the protected circuit's power supply voltage, it can automatically open the circuit breaker to cut off power, protecting downstream load appliances or electrical equipment from undervoltage damage. During use, the undervoltage release coil is connected to the power side of the circuit breaker; the circuit breaker can only close after the undervoltage release is energized.

08/8/2 Electrical component principle

The main raw material for ferrite beads is ferrite. Ferrite is a ferrimagnetic material with a cubic lattice structure. Ferrite materials are iron-magnesium alloys or iron-nickel alloys. Their manufacturing process and mechanical properties are similar to ceramics, and their color is gray-black. One type of magnetic core frequently used in electromagnetic interference filters is ferrite material, and many manufacturers offer ferrite materials specifically for electromagnetic interference suppression. This material is characterized by very high high-frequency loss and high permeability, which minimizes the capacitance generated between inductor windings under high-frequency, high-impedance conditions. For ferrites used in electromagnetic interference suppression, the most important performance parameters are permeability μ and saturation flux density Bs. Permeability μ can be expressed as a complex number; the real part constitutes inductance, and the imaginary part represents loss, which increases with frequency. Therefore, its equivalent circuit is a series circuit composed of inductance L and resistance R, where both L and R are functions of frequency. When a wire passes through this ferrite core, the resulting inductive impedance formally increases with frequency, but the mechanism differs completely at different frequencies. In the low-frequency range, impedance consists of inductive reactance. At low frequencies, R is small, the core permeability is high, so the inductance is large, and L plays the main role. Electromagnetic interference is suppressed by reflection, and core loss is small at this stage. The entire device acts as an inductor with low loss and high Q characteristics. This inductance is prone to resonance, so in the low-frequency range, interference may sometimes increase after using ferrite beads. In the high-frequency range, impedance consists of resistive components. As frequency increases, core permeability decreases, leading to reduced inductance and reduced inductive reactance. However, core loss increases, and the resistive component increases, leading to increased total impedance. When high-frequency signals pass through the ferrite, electromagnetic interference is absorbed and dissipated as heat. Ferrite suppression components are widely used on printed circuit boards, power lines, and data lines. For example, adding ferrite suppression components at the power line entry point of a printed board can filter out high-frequency interference. Ferrite rings or beads are specifically used to suppress high-frequency interference and spike interference on signal lines and power lines. They also have the ability to absorb electrostatic discharge pulse interference. The values of two components are proportional to the length of the bead, and the bead length has a significant impact on suppression effectiveness; the longer the bead, the better the suppression. Inductors can be used for power filtering. The circuit symbol for a ferrite bead is an inductor, but the model number indicates it is a bead. In terms of circuit function, ferrite beads and inductors operate on the same principle, differing only in frequency characteristics. Ferrite beads are composed of oxide magnets. Ferrite beads offer significant resistance only to high-frequency signals; their resistance at low frequencies is much lower than that of inductors. Ferrite beads are a rapidly developing anti-interference component, being inexpensive, easy to use, and effective at filtering high-frequency noise.

08/8/2 Electrical component structure

Generators are typically composed of components such as the stator, rotor, end covers, and bearings. The stator consists of the stator core, winding coils, frame, and other structural parts that fix these components. The rotor consists of the rotor core (or magnetic poles, yoke), windings, retaining rings, centering rings, slip rings, fans, and shafts. Bearings and end covers connect and assemble the generator's stator and rotor, allowing the rotor to rotate within the stator, cutting magnetic flux lines to generate induced electromotive force. This is led out through terminal blocks and connected to the circuit, thereby generating current.

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