Deif electrical components Germany Deif model Deif price

Deif electrical components consist of wire wound turn by turn around an insulating tube. The wires are mutually insulated, and the insulating tube can be hollow or contain an iron core or magnetic powder core. An inductor coil is a device that operates based on the principle of electromagnetic induction. When current flows through a wire, it generates an electromagnetic field around the wire, and this electromagnetic field induces effects on other wires within its range. The effect on the wire generating the electromagnetic field itself is called "self-inductance," meaning the changing current generated by the wire produces a changing magnetic field, which further affects the current in the wire; the effect on other wires within this electromagnetic field range is called "mutual inductance." The electrical characteristics of an inductor coil are opposite to those of a capacitor: it "passes low frequencies and blocks high frequencies." High-frequency signals encounter significant resistance when passing through an inductor coil and struggle to pass through, whereas low-frequency signals encounter less resistance and can pass through more easily. The resistance of an inductor coil to direct current is almost zero. Resistance, capacitance, and inductance all present certain resistance to the flow of electrical signals in a circuit, which we call "impedance." The impedance presented by an inductor coil to current signals utilizes the self-inductance of the coil. Inductor coils are sometimes abbreviated as "inductance" or "coil," represented by the letter "L." When winding an inductor coil, the number of turns wound is generally referred to as the "number of turns" of the coil.

Deif electrical component classification

Plug-in fuses are commonly used at the end of lines for short-circuit protection of distribution branches 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 ceramic cap. They are commonly used in machine tool electrical control equipment. Spiral fuses. Enclosed fuses are divided into filled fuses and unfilled fuses. Filled fuses generally use square ceramic 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. Due to the low overload capacity of semiconductor components, they can only withstand large overload currents for extremely short periods, requiring fast-acting fuses with rapid melting capabilities. 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 into a variable cross-section fusible element with V shaped deep grooves. Fast-acting fuses are often abbreviated as "fast fuses," characterized by fast melting 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 temperatures that rapidly vaporize the sodium. The gaseous sodium presents a high-resistance state, thereby limiting the short-circuit current. After the short-circuit current disappears, the temperature drops, and 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.

Deif electrical component functions

The main purposes of isolating switches (disconnectors) are: 1, to isolate the power supply, disconnecting high-voltage maintenance equipment from live equipment, creating a clearly visible break point. 2, isolating switches cooperate with circuit breakers to perform switching operations according to system operation requirements, changing the system wiring configuration. 3, to connect or disconnect low-current circuits. Isolating switches can perform the following operations: connect or disconnect bypass currents of closed-loop switches; connect or disconnect grounding wires of transformer neutral points, but if an arc-suppression coil is connected to the neutral point, operation is only permitted when the system is fault-free; connect or disconnect voltage transformers and lightning arresters; connect or disconnect capacitive currents of busbars and equipment directly connected to busbars; connect or disconnect no-load lines with capacitive currents not exceeding 5 amperes; triple-pole isolating switches can connect or disconnect loads with voltages up to 10 kilovolts and currents below 15 amperes. When operating isolating switches, note that when energizing a line, first close the busbar-side isolating switch, then the line-side isolating switch, and finally the circuit breaker. When de-energizing a line, first open the circuit breaker, then open the isolating switch. Do not operate high-voltage isolating switches under load.

Deif electrical component characteristics

The main parameters characterizing resistor characteristics include nominal resistance and its tolerance, rated power, load characteristics, and temperature coefficient of resistance. Load characteristics: When the ambient temperature is below tR, the resistor must not exceed its rated power. When exceeding tR, the load power must be reduced. Each type of resistor has specified load characteristics. Additionally, allowable load reduction applies under low-pressure conditions. Under pulse loads, the average pulse power is far lower than the rated power, usually governed by separate specifications. Within the specified ambient temperature range, the average relative change in resistance per 1℃ change in temperature is expressed in ppm/℃. In addition to these parameters, there are other technical indicators such as nonlinearity (degree of deviation of the current-voltage characteristic from a linear relationship), voltage coefficient (relative change rate of resistance per volt change in applied voltage), current noise (ratio of the effective value of noise potential generated by current flow within the resistor body to the test voltage, expressed by the current noise index), high-frequency characteristics (curve showing resistance decrease with increasing operating frequency due to distributed capacitance and inductance within the resistor body), and long-term stability (process of irreversible resistance changes during long-term use or storage due to environmental conditions).

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