TET5-7C in stock German TET5-7C electrical components TET5-7C inventory

TET5-7C 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 in the circuit where the current needs to be measured. Therefore, the full current of the line often flows through it. The secondary winding has many more turns and is connected in series in the measuring instrument 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 instrument and protection circuit 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 in the circuit where the current needs to be measured, so the full current of the line often flows through it. The secondary winding has many more turns and is connected in series in the measuring instrument 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 instrument and protection circuit is very small, and the operating state of the current transformer is close to a short circuit.

TET5-7C Electrical Component Classification

1, fuse resistors: also called fusible resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes their power to exceed the rated power, they will blow like a fuse to disconnect the connected circuit. Fuse resistors generally have low resistance values and low power ratings. 6, sensitive resistors: refer to resistors whose resistance value is sensitive to certain physical quantities (such as temperature, humidity, light intensity, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance value of the sensitive resistor changes accordingly, presenting different resistance values. Based on sensitivity to different physical quantities, sensitive resistors can be classified into thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magnetosensitive resistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials, so these resistors are also called semiconductor resistors. The resistance value of a thermistor changes with temperature; if the resistance decreases as temperature rises, it is a negative temperature coefficient thermistor. Negative temperature coefficient thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. The resistance value of a photoresistor changes with the intensity of incident light; when the incident light increases, the resistance of the photoresistor decreases, and when the incident light weakens, the resistance value increases.

TET5-7C Electrical Component Applications

Metal waveguides and metal resonant cavities are widely used in the decimeter, centimeter, and longer millimeter wave bands. Since the cross-section of the waveguide and the dimensions of the resonant cavity are close to the wavelength, the small size of metal waveguides and resonant cavities makes them difficult to manufacture. It is even more impossible to apply metal waveguides or resonant cavities in the infrared or visible light bands, where wavelengths are on the micron scale. For this reason, dielectric waveguides and dielectric resonators have rapidly developed and gained widespread application. Although the dimensions of dielectric waveguides and dielectric resonators are also on the scale comparable to the wavelength, they are easy to fabricate into tiny sizes using microfabrication techniques. For example, optical fibers and optical waveguides with cross-sectional dimensions on the micron scale belong to dielectric waveguides. The field in a metal waveguide can be regarded as caused by plane waves reflecting back and forth between conductor surfaces; the field in a dielectric waveguide can also be regarded as caused by total reflection of electromagnetic waves at dielectric interfaces. Therefore, a dense medium surrounded by a sparse medium forms a dielectric waveguide. In an ideal metal waveguide, the electromagnetic field forms a standing wave transversely, and outside the waveguide boundary, it approximates an ideal conductor with no electromagnetic field. In a dielectric waveguide, the electromagnetic field forms a standing wave transversely, but an electromagnetic field still exists outside the dielectric waveguide, which decays transversely, known as an evanescent field. In a metal waveguide filled with a uniform medium, the TE mode and TM mode can individually satisfy the short-circuit boundary conditions of the waveguide walls, so the TE mode and TM mode can always be separated, and both can propagate in the metal waveguide. When a metal waveguide is filled with two or more media, or partially filled with dielectric, the electromagnetic field must satisfy not only the boundary conditions on the conductor walls but also the continuity conditions at the media interfaces. In the case of uniform filling with two or more media, only hybrid modes of TE and TM, i.e., HEM modes, can exist. After understanding the above content, we can further explore dielectric resonators. As early as 1939, the concept and theory of dielectric resonators were proposed, but due to the lack of suitable dielectric materials, this theory remained dormant for over 20 years without practical development. By the 20th century, in the 60s, the successful development of high-permittivity ceramics such as rutile ceramic (ε≈80100) brought dielectric resonators back into attention. However, the high temperature coefficient of rutile ceramic limited its practical application. In the 20th century, during the 70s, barium titanate and zirconium titanate ceramics were developed; their high permittivity, low loss, and low temperature coefficient made dielectric resonators practical. Dielectric resonators have advantages such as small size, light weight, high quality factor, and good stability. They are particularly suitable for application in microstrip circuits, microwave integrated circuits, and the millimeter wave band, receiving significant attention and developing rapidly. When the permittivity is very high, the interface between the dielectric and air approximates an open circuit, and the reflection coefficient of electromagnetic waves at the interface approaches 5. At this point, the surface of the dielectric resonator can be regarded as an open-circuit wall, i.e., a magnetic wall. Thus, the dielectric resonator becomes a closed system with homogeneous boundary conditions, i.e., an equivalent open-circuit wall (magnetic wall) resonant cavity.

TET5-7C Electrical Component Principles

In addition to the function of converting light signals into electrical signals like a photodiode, a phototransistor also has the function of amplifying electrical signals. The appearance of a phototransistor is not much different from that of a general transistor. Generally, a phototransistor only leads out two terminals—the emitter and the collector—while the base is not led out. The casing also has a window to allow light to enter. To increase light exposure, the base area is made large, while the emitter area is small, so that incident light is mainly absorbed by the base region. During operation, the collector junction is reverse-biased, and the emitter junction is forward-biased. Without illumination, the current flowing through the transistor is the dark current Iceo = (1 + β) Icbo (very small), which is smaller than the penetration current of a general transistor; when illuminated, a large number of electron-hole pairs are generated, causing the base current Ib to increase. The current flowing through the transistor at this moment is called the photocurrent, and the emitter current Ie = (7 + β) Ib. It can be seen that a phototransistor has higher sensitivity than a photodiode.

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