xPEPPERLFUCHS electrical components Germany xPEPPERLFUCHS model xPEPPERLFUCHS price

xPEPPERLFUCHS electrical components are surge absorbers/varistor assemblies. Due to their nonlinear resistance change with voltage, they exhibit symmetry in both directions (positive and negative). They respond to abnormal voltages on the line, absorbing most of the surge/lightning energy while suppressing the abnormal voltage to a safe range, thereby improving the safety and stability of the circuit. In the standby state, the surge absorber (varistor) has very high impedance (several megohms) relative to the protected electronic components and does not affect the characteristics of the original design circuit. However, when an instantaneous surge voltage occurs (exceeding the breakdown voltage of the surge absorber), the impedance of the surge absorber drops low (only a few ohms), causing a short circuit in the line, thereby protecting electronic products or more expensive components.

xPEPPERLFUCHS electrical component characteristics

The most important characteristic of a diode is its unidirectional conductivity. In a circuit, current can only flow into the anode of the diode and out of the cathode. 1. Forward characteristics: In an electronic circuit, when the anode of the diode is connected to the high potential terminal and the cathode to the low potential terminal, the diode conducts. This connection method is called forward bias. It must be noted that when the forward voltage applied across the diode is very small, the diode still cannot conduct, and the forward current flowing through the diode is very weak. Only when the forward voltage reaches a certain value can the diode truly conduct. After conduction, the voltage across the diode remains basically unchanged, known as the "forward voltage drop" of the diode. 3. Reverse characteristics In an electronic circuit, when the anode of the diode is connected to the low potential terminal and the cathode to the high potential terminal, almost no current flows through the diode. At this time, the diode is in the cutoff state. This connection method is called reverse bias. When the diode is under reverse bias, a weak reverse current still flows through the diode, known as leakage current. When the reverse voltage across the diode increases to a certain value, the reverse current increases sharply, and the diode loses its unidirectional conductivity. This state is called diode breakdown. The injection current of a laser diode must be greater than the critical current density to satisfy the population inversion condition and emit laser light. The critical current density is related to the junction temperature and indirectly affects efficiency. During high-temperature operation, the critical current increases, efficiency decreases, and components may even be damaged.

xPEPPERLFUCHS electrical component classification

Plug-in fuses are often used at the end of lines for short-circuit protection of distribution branch circuits or electrical equipment. Spiral fuses have a fuse indicator on the upper cap of the fusible element. Once the fusible element melts, the indicator pops out immediately and can be observed through the glass hole on the porcelain cap. They are often used in machine tool electrical control equipment. Spiral fuses. Enclosed fuses are divided into filled fuses and unfilled fuses. Filled fuses generally use square porcelain tubes containing quartz sand and the fusible element, offering strong breaking capacity. Unfilled enclosed fuses enclose the fusible element in a sealed cylinder, with slightly lower breaking capacity. Fast-acting fuses are mainly used for short-circuit protection of semiconductor rectifier elements or rectifier devices. Since semiconductor components have very low overload capacity and can only withstand large overload currents for extremely short periods, short-circuit protection requires fast-acting fusing capability. The structure of fast-acting fuses is basically the same as that of filled enclosed fuses, but the material and shape of the fusible element differ. It uses a silver sheet stamped with a V shaped deep groove variable cross-section fusible element. Fast-acting fuses are commonly referred to as "fast fuses." Their characteristics include fast fusing speed, high rated current, strong breaking capacity, stable current-limiting characteristics, and small size. Self-resetting fuses use sodium metal as the fusible element, which has high electrical conductivity at room temperature. When a short-circuit fault occurs in the circuit, the short-circuit current generates high temperature, causing the sodium to vaporize rapidly. The gaseous sodium presents a high-resistance state, thereby limiting the short-circuit current. When the short-circuit current disappears and the temperature drops, the sodium metal restores its original good conductivity. Self-resetting fuses can only limit short-circuit current and cannot truly break the circuit. Their advantage is that the fusible element does not need to be replaced, allowing for repeated use.

xPEPPERLFUCHS electrical component principle

Its operating principle is the same as that of a transformer, with a basic structure consisting of an iron core and primary and secondary windings. It is characterized by a very small and relatively constant capacity, 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 winding. For this reason, the primary side of the voltage transformer is equipped with fuses, and the secondary side is reliably grounded to prevent high potential to ground on the secondary side from causing personal injury and equipment accidents when insulation between the primary and secondary sides is damaged. Voltage transformers for measurement are generally made with a single-phase dual-winding structure. The primary voltage is the voltage to be measured (such as the line voltage in a power system). They can be used in single phase, or two units can be connected in 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. The two output 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 winding is zero. Once a single-phase ground fault occurs, neutral point displacement occurs, and zero-sequence voltage appears between the terminals of the open delta, causing the relay to operate, thereby protecting the power system. When zero-sequence voltage appears in the winding, corresponding zero-sequence flux appears in the iron core. Therefore, this type of three-phase voltage transformer uses a side-yoke iron core or employs 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 devices in power transmission and supply 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 electrical energy. Voltage transformers are very similar to transformers, as both are used to transform voltage on lines. Why is voltage transformation needed on lines? This is because, depending on the different conditions of power generation, transmission, and consumption, the voltage levels on lines vary significantly. Some are low voltages such as 220V and 380V, 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 create significant difficulties in 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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