MULTIVAC electrical components Germany MULTIVAC model MULTIVAC price

MULTIVAC electrical components refer to electronic components that can open a circuit, interrupt current flow, or direct it to another circuit. The most common switches are electromechanical devices operated by humans, featuring one or more electrical contacts. "Closed" contacts indicate conduction, allowing current to flow; "open" switches indicate non-conduction, forming an open circuit and preventing current flow. The simplest switch consists of two metal pieces called "contacts." When the contacts touch, they complete the circuit; when separated, the circuit is open. When selecting contact metals, consider their corrosion resistance, as most metals form insulating oxides upon oxidation, preventing proper contact operation. Selection must also account for electrical conductivity, hardness, mechanical strength, cost, and toxicity. Contacts are sometimes plated with corrosion-resistant metals, typically on the contact surface, to prevent performance degradation due to oxides. Non-metallic conductive materials, such as conductive plastics, are also used for contact surfaces. Besides contacts, switches include movable parts that make or break the connection. Based on the movable part, switches are classified as lever switches, push-button switches, rocker switches, etc., while the movable part can also be other types of mechanical linkages.

MULTIVAC electrical component applications

The basic application of a standard thyristor is controlled rectification. Diode rectifier circuits, which are well-known, are uncontrolled. Replacing diodes with thyristors creates a controlled rectifier circuit. 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 the gate of VS receives no trigger pulse Ug, VS will not conduct. The thyristor triggers and conducts only when U2 is in the positive half-cycle and a trigger pulse Ug is applied to the gate. Its waveforms (c) and (d) show that voltage UL appears across the load RL only when the trigger pulse Ug arrives. An earlier Ug results in earlier thyristor conduction; a later Ug results in later conduction. By changing the arrival time of the gate trigger pulse Ug, the average output voltage UL across the load can be adjusted. In electrical engineering, half a cycle of AC is defined as 180°, known as the electrical angle. Thus, in each positive half-cycle of U2, the electrical angle from zero 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. Clearly, α and θ represent the conduction or blocking range of the thyristor during the half-cycle of forward voltage. By changing the control angle α or conduction angle θ, the average value UL of the pulsed DC voltage across the load is altered, achieving controlled rectification. Low-power plastic-sealed bidirectional thyristors are typically used in sound-and-light-controlled lighting systems, with rated currents less than 12A. Medium- and high-power plastic-sealed and metal-sealed thyristors are typically used in power-type controlled voltage regulation circuits, such as adjustable DC power supplies. High-power, high-frequency thyristors are typically used in industrial applications, such as high-frequency melting furnaces.

MULTIVAC electrical component functions

Functions of capacitors: 1. Capacitors used in coupling circuits are called coupling capacitors. These capacitor circuits are widely used in RC-coupled amplifiers and other capacitive coupling circuits to block DC and pass AC. 2. Capacitors used in filtering circuits are called filter capacitors. These capacitor circuits are used in power supply filters and various filter circuits to remove signals within certain frequency bands from the total signal. 2. Capacitors used in decoupling circuits are called decoupling capacitors. These capacitor circuits are used in the DC supply circuits of multi-stage amplifiers to eliminate harmful low-frequency coupling between amplifier stages. 3. Capacitors used in high-frequency oscillation suppression circuits are called high-frequency suppression capacitors. In audio negative-feedback amplifiers, these capacitor circuits are employed to eliminate potential high-frequency self-oscillation and whistling. 4. Capacitors used in LC resonant circuits are called resonant capacitors. Such capacitor circuits are required in both LC parallel and series resonant circuits. 5. Capacitors used in bypass circuits are called bypass capacitors. If a specific frequency band needs to be removed from a signal, a bypass capacitor circuit can be used. Depending on the frequency of the removed signal, there are full-band (all AC signals) bypass capacitor circuits and high-frequency bypass capacitor circuits. 6. Capacitors used in neutralization circuits are called neutralization capacitors. In RF and IF amplifiers for radios and RF amplifiers for televisions, these neutralization capacitor circuits are adopted to eliminate self-oscillation. 7. Capacitors used in timing circuits are called timing capacitors. Timing capacitor circuits are used in circuits requiring time control via capacitor charging and discharging, where the capacitor controls the magnitude of the time constant. 8. Capacitors used in integration circuits are called integrating capacitors. In synchronous separation circuits for potential field scanning, these integrating capacitor circuits are used to extract field synchronization signals from field composite sync signals. 9. Capacitors used in differentiation circuits are called differentiating capacitors. In flip-flop circuits, these differentiating capacitor circuits are employed to obtain sharp-triggered pulses from various signals (mainly rectangular pulses). 10. Capacitors used in compensation circuits are called compensation capacitors. In bass compensation circuits for cassette decks, these low-frequency compensation capacitor circuits are used to boost low-frequency signals in audio playback. Additionally, there are high-frequency compensation capacitor circuits. 11. Capacitors used in bootstrap circuits are called bootstrap capacitors. Common OTL power amplifier output stage circuits use this bootstrap capacitor circuit to slightly increase the amplitude of the positive half-cycle of the signal through positive feedback. 12. Capacitors used in crossover networks are called crossover capacitors. In speaker crossover networks, crossover capacitor circuits ensure that tweeters operate in the high-frequency range, mid-range speakers in the mid-frequency range, and woofers in the low-frequency range. 13. This refers to the effective external capacitance that, together with the quartz crystal resonator, determines the load resonant frequency. Common standard values for load capacitance are 16pF, 20pF, 30pF, 50pF, and 109pF. Load capacitance can be appropriately adjusted according to specific conditions, generally allowing the resonator's operating frequency to be tuned to its nominal value.

MULTIVAC electrical component characteristics

(1) offers a wide transient response range and strong harmonic measurement capability. The quality of transient characteristics is a key parameter for determining whether a transformer can be applied in power systems, particularly regarding coordination with relay protection operation times. Traditional electromagnetic transformers have poor response to high-frequency signals due to their iron cores and cannot accurately reflect the primary side's transient process. In contrast, the frequency range of optical current transformers is mainly determined by the electronic circuitry, avoiding iron core saturation issues, thus accurately reflecting the primary side's transient process. The structure of optical sensors allows measurement of harmonics on high-voltage power lines, which is difficult for electromagnetic induction transformers. (2) Digital interfaces provide strong communication capabilities. Since optical sensors transmit digital optical signals, they interface easily with communication networks without measurement errors during transmission. With the widespread adoption of microprocessor-based protection and control equipment, optical current transformers can directly provide digital quantities to secondary equipment, eliminating the need for converters and A/D sampling sections in original protection devices. This greatly simplifies secondary equipment and promotes research into new protection principles. (3) Small size, light weight, and easy upgradability meet the requirements for miniaturized and compact substations. Optical sensors acquire and process signals via sensor heads and electronic circuits, resulting in small sizes and weights generally below 1005 kg, facilitating integration into AIS or GIS. This significantly reduces the footprint of substations, meeting miniaturization and compactness requirements. Additionally, optical current transformers connect to secondary equipment via a small number of optical fibers, greatly reducing cable trenches and cabling.

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