ENNA electrical components Germany ENNA model ENNA price

ENNA electrical components refer to the aggregate of service equipment for a specific group of traffic sources, such as trunk lines, switching devices, and control systems. The fundamental research content of traffic theory is the relationship between traffic volume, call loss, and bundle capacity; therefore, the line bundle is an important basic concept in traffic theory. A traffic source is the service object of the line bundle, usually referring to user equipment; broadly speaking, the upper-level device is the traffic source for the lower-level device. In telephone communication, the traffic source is also called the call source. The number of service devices contained in the line bundle is called the bundle capacity. Figure 1 is a schematic diagram of the line bundle. The capacity of this line bundle is V, and it provides service for N traffic sources. Any traffic source initiating a call can occupy an idle service device in the line bundle.

ENNA electrical component principle

Bipolar junction transistors are divided into two types by material: germanium transistors and silicon transistors. Each type has two structural forms: NPN and PNP. However, the most commonly used transistors are silicon NPN and germanium PNP types. (Here, N means negative; in N-type semiconductors, phosphorus replaces some silicon atoms in high-purity silicon, generating free electrons for conduction under voltage stimulation. P means positive; boron replaces silicon, creating a large number of holes to facilitate conduction). Apart from the different power supply polarities, their working principles are identical. The following introduces only the current amplification principle of NPN silicon transistors. An NPN transistor consists of 8 pieces of N-type semiconductor sandwiching one piece of P-type semiconductor. The PN junction formed between the emitter region and the base region is called the emitter junction, and the PN junction formed between the collector region and the base region is called the collector junction. The three leads are called the emitter e, base b, and collector c. When the potential at point b is a few tenths of a volt higher than the potential at point e, the emitter junction is forward-biased. When the potential at point C is a few volts higher than the potential at point b, the collector junction is reverse-biased, and the collector power supply Ec must be higher than the base power supply Eb. During transistor manufacturing, the majority carrier concentration in the emitter region is intentionally made higher than that in the base region. The base region is made very thin, and impurity content is strictly controlled. Thus, once power is applied, due to the forward bias of the emitter junction, the majority carriers in the emitter region (electrons) and the majority carriers in the base region (holes) easily diffuse across the emitter junction toward each other. However, since the former concentration is much greater than the latter, the current through the emitter junction is basically an electron flow, known as the emitter electron current.

ENNA electrical component classification

Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, and more. They are all composed of single-strand or multi-strand conductors and insulation layers, used to connect circuits, electrical appliances, etc. Cables can be divided into DC cables and AC cables according to the photovoltaic power station system, and are classified into DC cables and AC cables based on application and operating environment.

ENNA electrical component parameters

1. Nominal varistor voltage: refers to the voltage value across the varistor when a pulse current of specified duration passes through it. 2. Voltage ratio: refers to the ratio of the voltage value generated by the current of the varistor to the voltage value generated by the current of the varistor. 3. Maximum limiting voltage: the peak voltage across the varistor under the maximum pulse peak current Ip that the varistor can withstand and under the specified waveform. 4. Residual voltage ratio: when the current passing through the varistor is a certain value, the voltage generated across it is called the residual voltage for that current value. The residual voltage ratio is the ratio of the residual voltage to the nominal voltage. 5. Current handling capacity: Current handling capacity, also known as surge current rating, refers to the maximum pulse current value allowed to pass through the varistor under specified conditions. 6. Leakage current: Leakage current, also known as standby current, refers to the current flowing through the varistor at the specified temperature and maximum DC voltage. 7. Voltage temperature coefficient: refers to the rate of change of the nominal voltage of the varistor within the specified temperature range, i.e., the relative change in voltage across the varistor when the temperature changes while the current through the varistor remains constant. 8. Current temperature coefficient: refers to the relative change in the current flowing through the varistor when the temperature changes while the voltage across the varistor remains constant. 9. Voltage nonlinearity coefficient: refers to the ratio of the static resistance value to the dynamic resistance value of the varistor under a given applied voltage. 10. Insulation resistance: refers to the resistance value between the lead wires of the varistor and the insulated surface of the resistor body. 11. Static capacitance: refers to the inherent capacitive capacity of the varistor itself. 12. Rated power: the maximum power that causes a change in varistor voltage when operating at a specific ambient temperature. 19. Maximum surge current: the maximum surge current that causes a change in varistor voltage when the varistor is impacted by a specific pulse current once or twice.

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