puk group electrical components German puk group models puk group prices

puk group electrical components are tools that can accurately determine and measure temperature, divided into pointer thermometers and digital thermometers. Depending on the temperature-sensing substance used and the temperature measurement range, there are kerosene thermometers, alcohol thermometers, mercury thermometers, gas thermometers, resistance thermometers, thermocouple thermometers, radiation thermometers and optical pyrometers, bimetallic thermometers, etc. Digital thermometers can accurately determine and measure temperature, displaying it digitally rather than with a pointer or mercury. Hence they are called digital thermometers or digital temperature gauges.

puk group electrical component classification

Fuses can be classified into high-voltage fuses and low-voltage fuses according to the operating voltage. According to the protected object, they can be classified as fuses for protecting transformers and general electrical equipment, fuses for protecting voltage transformers, fuses for protecting power capacitors, fuses for protecting semiconductor components, fuses for protecting motors, and fuses for protecting household appliances, etc. According to structure, they can be classified as open-type, semi-enclosed, cartridge-type, and expulsion-type fuses. Open-type fuses have a simple structure, with the fusible element fully exposed to the air, supported by porcelain pillars without bases, suitable for low-voltage outdoor use. When interrupting current, they produce significant noise and light in the atmosphere. Semi-enclosed fuses have their fusible elements mounted on porcelain frames, inserted into porcelain boxes with metal sockets at both ends, suitable for low-voltage indoor use. The noise and light produced during current interruption are contained by the porcelain box. In cartridge-type fuses, the fusible element is installed inside the fuse body. It is then inserted into a base or directly connected into the circuit for use. The fuse link is a fully sealed insulating tube with metal caps or contact blades at both ends. If the insulating tube of this type of fuse is filled with quartz sand, it has a current-limiting effect when interrupting current, greatly increasing the breaking capacity, hence it is also called a high-breaking-capacity fuse. If the tube is evacuated, it is called a vacuum fuse. If the tube is filled with SF6 gas, it is called an SF6 fuse, the purpose being to improve arc-extinguishing performance. Since quartz sand, vacuum, and SF15 gas all have good insulating properties, this type of fuse is suitable not only for low voltage but also for high voltage. Expulsion-type fuses have the fusible element installed in an insulating tube made of solid gas-generating material. The solid gas-generating material can be electrical anti-white cardboard or organic glass material, etc. When short-circuit current passes through the fusible element, the element melts immediately, producing an electric arc. The high-temperature arc causes the solid gas-generating material to rapidly decompose, producing a large amount of high-pressure gas, which ejects the ionized gas and electric arc from both ends of the tube, emitting intense noise and light, and extinguishing the arc when the AC current crosses zero, thereby interrupting the current. The insulating tube is usually mounted on an insulating support to form the complete fuse assembly. Sometimes the upper end of the insulating tube is designed to be movable, detaching and dropping down immediately after current interruption. This type of expulsion fuse is commonly known as a drop-out fuse.

puk group electrical component applications

The most widely used type among various motors is the AC asynchronous motor. It is easy to use, reliable in operation, low in price, and robust in structure, but has a low power factor and difficult speed regulation. Synchronous motors are commonly used for high-capacity, low-speed prime movers. Synchronous motors not only have a high power factor, but their speed is independent of load size, determined solely by the grid frequency. They operate relatively stably. DC motors are often used in applications requiring wide-range speed regulation. However, they have commutators, complex structures, high prices, difficult maintenance, and are unsuitable for harsh environments. With the development of power electronics technology, AC motor speed control technology is becoming mature, equipment prices are decreasing, and they have begun to be applied. The maximum output mechanical power that a motor can handle under specified duty cycles without causing overheating is called its rated power; attention must be paid to the ratings on the nameplate during use. During motor operation, care must be taken to match the load characteristics with the motor characteristics to avoid runaway or stalling. Motors can provide a wide range of power, from milliwatts to tens of megawatts. The use and control of motors are very convenient, featuring capabilities such as self-starting, acceleration, braking, reversal, and holding. Generally, when a motor's speed is regulated, its output power changes with the speed.

puk group electrical component applications

The main application of rectifiers is to convert AC power to DC power. Since all electronic devices require DC, but utility power supply is AC, unless batteries are used, all electronic device power supplies inevitably contain rectifiers. Converting DC voltage is much more complex. One method of DC-DC conversion is to first convert the power to AC (using a device called an inverter), then use a transformer to change the AC voltage, and finally rectify it back to DC power. Rectifiers are also used for demodulation of AM radio signals. The signal may be amplified (increasing the signal amplitude) before demodulation; if not amplified, diodes with very low voltage drop must be used. When using rectifiers for demodulation, careful matching of capacitors and load resistors is required. If the capacitance is too small, excessive high-frequency components will pass through; if too large, the signal will be suppressed. Rectifier circuits are also used to provide fixed-polarity voltage required for electric welding. Sometimes the output current of such circuits needs to be controlled; in this case, thyristors (a type of silicon-controlled rectifier) replace the diodes in bridge rectifiers, and their voltage output is adjusted via phase-control triggering. Thyristors are also used in railway locomotive systems at various levels to achieve fine tuning of traction motors.

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