AROVASERVIS electrical components Germany AROVASERVIS model AROVASERVIS price

AROVASERVIS electrical components are instruments that measure by converting high primary current to low secondary current based on the principle of electromagnetic induction. A current transformer consists of a closed iron core and windings. Its primary winding has very few turns and is connected in series with the circuit where the current needs to be measured. Therefore, the full line current often flows through it. The secondary winding has more turns and is connected in series with measuring instruments and protection circuits. When the current transformer is in operation, its secondary circuit is always closed, so the impedance of the coils connected in series with the measuring instruments and protection circuits is very small, and the operating state of the current transformer is close to a short circuit. The current transformer converts high primary current to low secondary current for measurement; the secondary side must not be open-circuited. The principle of the current transformer is based on electromagnetic induction. A current transformer consists of a closed iron core and windings. Its primary winding has very few turns and is connected in series with the circuit where the current needs to be measured, so the full line current often flows through it. The secondary winding has more turns and is connected in series with measuring instruments and protection circuits. When the current transformer is in operation, its secondary circuit is always closed, so the impedance of the coils connected in series with the measuring instruments and protection circuits is very small, and the operating state of the current transformer is close to a short circuit.

AROVASERVIS electrical components applications

The most basic application of ordinary thyristors is controlled rectification. The familiar diode rectifier circuit belongs to uncontrolled rectifier circuits. If diodes are replaced with thyristors, a controlled rectifier circuit can be formed. Taking the simplest single-phase half-wave controlled rectifier circuit as an example, during the positive half-cycle of the sinusoidal AC voltage U2, if there is no input trigger pulse Ug at the control gate of VS, VS still cannot conduct. Only when U2 is in the positive half-cycle and a trigger pulse Ug is applied externally to the control gate, the thyristor is triggered to conduct. Draw its waveforms (c) and (d). Only when the trigger pulse Ug arrives, will there be voltage UL output across the load RL. If Ug arrives early, the thyristor conducts earlier; if Ug arrives late, the thyristor conducts later. By changing the arrival time of the trigger pulse Ug at the control gate, the average value UL of the output voltage across the load can be adjusted. In electrical engineering technology, half a cycle of AC is often defined as 180°, called the electrical angle. Thus, in each positive half-cycle of U2, the electrical angle experienced from the zero value to the instant the trigger pulse arrives is called the control angle α; the electrical angle during which the thyristor conducts in each positive half-cycle is called the conduction angle θ. Obviously, both α and θ are used to indicate the conduction or blocking range of the thyristor during the half-cycle when it withstands forward voltage. By changing the control angle α or the conduction angle θ, the average value UL of the pulsed DC voltage across the load is changed, achieving controlled rectification. Low-power plastic-packaged bidirectional triacs are usually used in sound and light control lighting systems. Rated current is less than 2A. Large and medium-power plastic-packaged and metal-can packaged thyristors are usually used in power-type controlled voltage regulation circuits, such as adjustable output DC power supplies, etc. High-power high-frequency thyristors are usually used in industry, such as in high-frequency melting furnaces.

AROVASERVIS electrical components composition

Transformer components include the body (core, windings, insulation, leads), transformer oil, tank and cooling device, voltage regulation device, protection devices (breather, safety air duct, gas relay, oil conservator and temperature measuring device, etc.), and outlet bushings. Specific composition and functions: (1) The core is the main magnetic circuit part of the transformer. It is usually made of stacked hot-rolled or cold-rolled silicon steel sheets with high silicon content and surface coated with insulating varnish. The core is divided into two parts: the core column and the yoke. The core column is fitted with windings; the yoke is used to close the magnetic circuit. (2) The winding is the circuit part of the transformer, wound with double-silk insulated flat wire or enamel-coated round wire. The basic principle of a transformer is electromagnetic induction. Taking a single-phase two-winding transformer as an example to explain its basic working principle: when voltage is applied to the primary winding, current flows, generating alternating magnetic flux in the core. This flux is called the main flux. Under its effect, electromotive forces are induced in the windings on both sides, finally driving the transformer control device.

AROVASERVIS electrical components performance

The main performance indicators of loudspeakers include parameters such as sensitivity, frequency response, rated power, rated impedance, directivity, and distortion. (1) Rated Power: Loudspeaker power is distinguished into nominal power and maximum power. Nominal power, also called rated power or non-distortion power, refers to the maximum input power allowed within the rated non-distortion range of the loudspeaker. The power marked on the loudspeaker's label and technical manual is this value. Maximum power refers to the peak power the loudspeaker can withstand at any instant. (2) Rated Impedance: The impedance of a loudspeaker is generally related to frequency. (3) Frequency Response: When audio signals of the same voltage but different frequencies are applied to a loudspeaker, the resulting sound pressure will change. Generally, the sound pressure produced at mid-frequencies is higher, while it is lower at low and high frequencies. The frequency range of high and low tones where the sound pressure drops to a certain value of the mid-frequency sound pressure is called the frequency response characteristic of that loudspeaker. (4) Distortion: The phenomenon where a loudspeaker cannot faithfully reproduce the original sound is called distortion. There are two types of distortion: frequency distortion and nonlinear distortion. Frequency distortion is caused by stronger reproduction of signals at some frequencies and weaker reproduction at others, destroying the original proportion of high and low volume and changing the original timbre. Nonlinear distortion is caused by the vibration of the loudspeaker's vibration system not being completely consistent with the signal fluctuations, adding new frequency components to the output sound waves. (5) Directivity Characteristic: Used to characterize the distribution of sound pressure radiated by the loudspeaker in all directions in space. The higher the frequency, the narrower the directivity; the larger the cone, the stronger the directivity.

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