TET7-10 in stock. German TET7-10 electrical components. TET7-10 inventory.

The TET7-10 electrical component is a high-power electronic component, also known as a thyristor. It offers advantages such as compact size, high efficiency, and long service life. In automatic control systems, it can serve as a high-power drive device, enabling low-power control elements to manage high-power equipment. It is widely used in AC/DC motor speed control systems, power regulation systems, and servo systems. Thyristors are categorized into unidirectional thyristors and bidirectional thyristors. The bidirectional thyristor is also called a triac, abbreviated as TRIAC. Structurally, a bidirectional thyristor is equivalent to two unidirectional thyristors connected in reverse parallel. This type of thyristor has bidirectional conduction capability. Its on/off state is determined by the gate G. Applying a positive pulse (or negative pulse) to the gate G enables forward (or reverse) conduction. The advantages of this device include a simple control circuit and no reverse voltage withstand issue, making it particularly suitable for use as an AC contactless switch.

TET7-10 Electrical Component Classification

(1) Generator classification includes: DC generators and AC generators; (2) AC generators are divided into synchronous generators and asynchronous generators (rarely used); (3) AC generators can also be classified into single-phase generators and three-phase generators. There are many types of generators. Based on principle, they are divided into synchronous generators, asynchronous generators, single-phase generators, and three-phase generators. Based on generation method, they are divided into steam turbine generators, hydroelectric generators, diesel generators, gasoline generators, etc. Based on energy source, they are divided into thermal power generators, hydropower generators, etc.

TET7-10 Electrical Component Structure

Unidirectional thyristors, commonly known as conventional thyristors, are used. They consist of four layers of semiconductor material and have three PN junctions, with three external electrodes: the electrode drawn from the first layer of P-type semiconductor is called the anode A, the electrode drawn from the third layer of P-type semiconductor is called the gate G, and the electrode drawn from the fourth layer of N-type semiconductor is called the cathode K. As can be seen from the circuit symbol of the thyristor, it is a unidirectional conductive device like a diode, but with an additional gate G, which gives it completely different operating characteristics compared to a diode. The P1N1P2N2 four-layer three-terminal device, based on silicon monocrystal, is internationally known as a silicon-controlled rectifier because its characteristics are similar to those of a vacuum thyratron, abbreviated as thyristor T. Since thyristors were initially used in static rectification, they are also referred to as silicon-controlled rectifiers, abbreviated as SCR SCR. In terms of performance, SCRs not only have unidirectional conductivity but also possess more valuable controllability than silicon rectifiers (commonly known as "dead silicon"). They have only two states: conduction and cutoff. SCRs can control high-power electromechanical equipment with milliampere-level current. If this power is exceeded, due to a significant increase in switching losses, the allowable average current decreases, and the nominal current should be derated. SCRs have many advantages, such as controlling high power with low power, with a power amplification factor reaching hundreds of thousands; extremely fast response, turning on and off within microseconds; contactless operation, no sparks, no noise; high efficiency, low cost, etc. Weaknesses of SCRs include poor static and dynamic overload capacity and susceptibility to interference causing false triggering. SCRs are mainly classified by their physical appearance into bolt-type, flat-type, and flat-bottom types. Structure of SCR components. Regardless of the physical appearance of the SCR, their core consists of a four-layer P1N1P2N2 structure made of P-type silicon and N-type silicon. It has three PN junctions (J1, J2, J3), with the anode A drawn from the P1 layer of the J1 structure, the cathode K drawn from the N2 layer, and the gate G drawn from the P5 layer, making it a four-layer three-terminal semiconductor device.

TET7-10 Electrical Component Principle

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. Its characteristic is very small and relatively constant capacity, operating close to no-load condition 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. Therefore, the primary side of the voltage transformer is equipped with a fuse, 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 double-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 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 for measuring different voltages. Voltage transformers for protective grounding also have a third coil, called a three-coil voltage transformer. The third coils of the three-phase unit 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. When zero-sequence voltage appears in the coil, corresponding zero-sequence flux appears in the iron core. Therefore, 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 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 supply systems such as power plants and substations. Precision voltage transformers are instruments used in electrical testing laboratories to extend measurement ranges for measuring voltage, power, and energy. Voltage transformers are very similar to transformers, both 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 on lines varies greatly, with significant differences. Some are low voltage 220V and 390V, 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 for direct voltage measurement on high-voltage lines.

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