fantec electrical components, German fantec models, fantec prices

fantec electrical components are devices that convert alternating current to direct current and can be used in power supply units and for detecting radio signals, among other applications. Rectifiers can be made from vacuum tubes, ignitrons, solid-state silicon semiconductor diodes, mercury arcs, and other materials. Conversely, a device that converts direct current to alternating current is called an "inverter." In standby UPS systems, only the battery needs to be charged without supplying power to the load, so only a charger is required. In double-conversion UPS systems, this device supplies power to the inverter and charges the battery, hence it is called a rectifier/charger. A rectifier is a rectifying device; simply put, it is a device that converts AC to DC. It has two main functions: first, to convert AC to DC, which is then filtered and supplied to the load or to the inverter; second, to provide charging voltage to the battery. Therefore, it also serves as a charger.

fantec electrical component features

Mercury switches operate by moving mercury enclosed in a glass or metal housing to make or break the circuit. Compared with mechanical switches, mercury switches have many characteristics: (1) They can be used in harsh environmental conditions. Since the mercury switch is sealed, the internal mercury is isolated from the outside, allowing use in environments with oil, steam, dust, and corrosive gases. (2) The external force required for switching is small. Mercury is the only metal that remains liquid at room temperature; it has high surface tension and specific gravity. A slight tilt caused by minimal external force moves the mercury, enabling the switch to open or close. (3) Mercury has good conductivity, and the contact resistance between the electrodes of a mercury switch is generally very low. (4) The current allowed through a mercury switch depends on the electrode material. (5) Since the switching action is determined by the gravity of the mercury, it can operate reliably over long periods. (6) The electrode contacts are liquid, producing no noise. (7) Because mercury can flow, the switch opens or closes when acceleration exceeds a set value, allowing it to be used as a vibration-sensitive element. (8) Small size, diverse forms, and fully sealed construction. (9) Simple structure and low cost. (10) High quality and premium products, suitable for beginners

fantec electrical component applications

Thermistors can also be used as electronic circuit components for temperature compensation in instrument circuits and cold-junction compensation for thermocouples. Utilizing the self-heating characteristics of NTC thermistors enables automatic gain control, forming RC oscillator amplitude-stabilization circuits, delay circuits, and protection circuits. When the self-heating temperature is much higher than the ambient temperature, the resistance is also related to the heat dissipation conditions of the environment. Therefore, this characteristic of thermistors is often utilized in anemometers, flow meters, gas analyzers, and thermal conductivity analysis to create specialized sensing elements. PTC Thermistors are mainly used for overheat protection of electrical equipment, contactless relays, constant temperature control, automatic gain control, motor starting, time delay, automatic degaussing in color televisions, fire alarms, and temperature compensation. Main disadvantages: (1) The relationship between resistance and temperature is highly nonlinear; (2) Poor consistency and interchangeability of components; (3) Components are prone to aging and have poor stability; (4) Except for special high-temperature thermistors, most thermistors are only suitable for the range of 0 to 154 °C, which must be noted during use.

fantec electrical component principles

Its working principle is the same as that of a transformer, with a basic structure consisting of an iron core and primary and secondary windings. The capacity is very small and relatively constant, operating close to no-load conditions during normal operation. The impedance of the voltage transformer itself is very small; once a short circuit occurs on the secondary side, the current will increase sharply and burn out the coil. For this reason, fuses are connected to the primary side of the voltage transformer, and the secondary side is reliably grounded to prevent high potential to ground on the secondary side in case of insulation damage between the primary and secondary sides, which could cause personal injury and equipment accidents. Voltage transformers for measurement are generally made with a single-phase, two-winding structure. The primary voltage is the voltage to be measured (such as the line voltage of the power system); they can be used singly or two units can be connected in a V-V configuration for three-phase use. Voltage transformers used in laboratories often have multiple taps on the primary side to accommodate the need to measure different voltages. Voltage transformers for protective grounding also include a third winding, known as a three-winding voltage transformer. The third windings of the three phases are connected in an open-delta configuration, with the two terminals of the open delta connected to the voltage coil of the ground protection relay. During normal operation, the three-phase voltages of the power system are symmetrical, and the sum of the three-phase induced electromotive forces on the third winding is zero. Once a single-phase ground fault occurs, the neutral point shifts, and zero-sequence voltage appears between the terminals of the open delta, causing the relay to operate and thus protecting the power system. If zero-sequence voltage appears in the winding, corresponding zero-sequence flux will appear in the iron core. For this reason, such three-phase voltage transformers adopt a side-yoke iron core or use three single-phase voltage transformers. For this type of transformer, the accuracy requirement for the third winding is not high, but it requires certain over-excitation characteristics (i.e., when the primary voltage increases, the magnetic flux density in the iron core increases by a corresponding factor without damage). Voltage transformers are indispensable electrical appliances in power transmission and distribution systems such as power plants and substations. Precision voltage transformers are instruments used in electrical testing laboratories to extend measurement ranges and measure voltage, power, and energy. Voltage transformers are very similar to transformers; both are used to transform voltage on lines. Why is voltage transformation needed on lines? This is because, depending on the different conditions of generation, transmission, and consumption, the voltage on lines varies greatly, with significant differences. Some are low voltages such as 220V and 383V, while others are high voltages of tens of thousands or even hundreds of thousands of volts. To directly measure these low and high voltages, corresponding low-voltage and high-voltage voltmeters and other instruments and relays would need to be manufactured according to the line voltage levels. This would not only bring great difficulties to instrument manufacturing but, more importantly, it is impossible and absolutely prohibited to directly manufacture high-voltage instruments and measure voltage directly on high-voltage lines.

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