18K121-K20D3

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18K121-K20D3 is a device used in various industrial applications. It is a three phase diode rectifier which is built using four Thyristors. The device is only suitable for alternating current (AC) networks with a voltage between three hundred and sixty and four hundred and fifty volts and a frequency of fifty or sixty Hertz.

The main functions of 18K121-K20D3 are to convert AC current into Direct Current (DC) current and to provide power factor correction by controlling the power flow of the current. The device also assists in limiting inrush currents and reducing harmonic distortion. The device has an efficiency of ninety two percent and a power factor of ninety five percent.

The device is used in applications such as rectification of AC current for electronic and electrical systems, electric power transmission and distribution, and air conditioners, in addition to many other industrial applications. In each situation, the 18K121-K20D3 device is designed to control the power flow and current in a manner tailored to the application.

18K121-K20D3 device operates according to the principle of four quadrant operation. In each quadrant, the operation of the thyristors is controlled by applying pulses to the gate. This creates a switching action which turns the thyristors on or off according to the need of the application. The reverse voltage region of the thyristors is used to ensure that no current flows during the reverse gaps.

The device also has self-commutation capability, which means that when a pulse is applied to a thyristor, it turns on and only turns off when a pulse is applied to a different thyristor. This helps regulate the flow of current in the system and allows the device to control the power flow in a very precise manner.

The device requires a DC voltage supply, which is usually provided by a separate DC source or a full bridge rectifier and then fed into the first thyristor’s gate. The application also requires a pulsage control unit and a signal transformer. The pulsage control unit is responsible for generating the pulses to be applied to the thyristors, while the signal transformer is used to measure and control the parameters of currents in the system.

In conclusion, 18K121-K20D3 is a three phase rectifier device used in industrial applications. It is designed to control and regulate current flow in a precise manner and to provide power factor correction. Its main components are four thyristors and a DC voltage supply. The device operates according to the principle of four quadrant operation and self-commutation. It also requires a pulsage control unit and a signal transformer.

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