fantec electrical components Germany fantec model fantec price

fantec electrical components are devices that convert alternating current into direct current, and can be used in power supply units and for detecting radio signals, etc. Rectifiers can be made from vacuum tubes, ignitrons, solid-state silicon semiconductor diodes, mercury arcs, etc. Conversely, a device that converts direct current into alternating current is called an "inverter". In standby UPS systems, only the battery needs to be charged, without supplying power to the load, so there is only a charger. In double-conversion UPS systems, this device supplies power to the inverter and also 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 acts as a charger.

fantec electrical component features

Mercury switches achieve switching on and off by the movement of mercury encapsulated within a glass or metal housing. Therefore, compared with mechanical switches, mercury switches have many characteristics: (1) Can be used in harsh environmental conditions. Since the mercury switch is sealed, the internal mercury is isolated from the outside, so it can be used 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. Only a slight external force is needed to tilt the mercury switch, causing the mercury to move and achieve switching. (3) Mercury has good conductivity, and the contact resistance between the electrodes of a mercury switch is generally very low. (4) The current allowed to pass through a mercury switch depends on the electrode material. (5) Since the switching of a mercury switch is determined by the gravity of the mercury, it can operate reliably for long periods. (6) The electrode contacts are liquid contacts, producing no noise. (7) Since mercury can flow, as long as the acceleration exceeds the set value, the mercury switch can turn on or off, so it can be used as a vibration-sensitive element. (8) Small size, diverse forms, and fully sealed devices. (9) Simple structure, low price. (10) High quality, 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 temperature compensation for thermocouples, etc. 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, in flow meters, gas analyzers, and thermal conductivity analysis, this characteristic of thermistors is often utilized to create specialized detection 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 of color TVs, fire alarms, and temperature compensation. Main disadvantages: (1) The relationship between resistance and temperature is severely 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, the vast majority of 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, and its basic structure consists of an iron core and primary and secondary windings. The characteristic is that the capacity is very small and relatively constant, operating close to a no-load state 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 into a single-phase dual-coil 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 adapt to the need to measure different voltages. Voltage transformers for protective grounding also have a third coil, known as a three-coil voltage transformer. The third coils of the three phases are connected in an open-delta configuration. The two terminals of the open delta are 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 coil 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, thereby protecting the power system. If zero-sequence voltage appears in the coil, corresponding zero-sequence flux will appear in the iron core. For this reason, this type of three-phase voltage transformer uses a side-yoke iron core or three single-phase voltage transformers. For this type of transformer, the accuracy requirement for the third coil is not high, but it requires a certain over-excitation characteristic (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 supply systems such as power plants and substations. Precision voltage transformers are instruments used in electrical testing laboratories to expand 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 situations of generation, transmission, and consumption, the voltage on the lines varies greatly, with huge differences. Some are low voltage 220V and 383V, while others are high voltage 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 magnitude. 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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