How Does Transmission Switching Work And What Are Its Types And Functions?

Updated October 6, 2023

Transmission Switching

Demand for the reliability of an electrical system continues to grow in priority and because of this, electrical service providers are looking for the means to provide this desired improvement. Uninterrupted operation of electrical appliances is always an urgent need for electricians and specialists in the field of energy supply. The requirements for uninterrupted operations are presented at the production site, in medical institutions, security complexes and at home.

An effective method of reducing lightning-related interruptions in transmission lines is the strategic application of lightning arresters. Since the early 1990s, inexpensive and lightweight lightning conductors have been available for installation on transmission lines. Surge arresters can also be an effective means of controlling transmission line costs, such as when used in controlling switching surges, voltage improvement projects, and compact line construction.

However, the transmission switch is designed for reliable operation of the power supply and backup power supply. City energy distribution networks do not always deliver a quality resource. Due to sudden changes in voltage, any electrical appliance may fail. With the help of phase switches, the uninterrupted operation of instruments and equipment during voltage fluctuations is ensured.

In a switching power supply, the “switch” is a semiconductor that is brought to saturation so that it conducts current with almost zero resistance. It performs this operation several thousand times per second, creating an intermediate high-frequency alternating current. As the semiconductor has been placed in a saturation state, its resistance becomes virtually zero, hence its high efficiency and the low thermal release.

Types of transmission switching devices

Manufacturers offer a wide selection of devices for different purposes of operation. Conventionally, switches can be divided into two large groups:

Automatic – depending on the voltage indicators, switching to another line occurs automatically when the current one cannot cope with the load and cannot work normally. The microprocessor digital device arbitrarily selects the network phase. Priority can be any phase.

Manual – the required mode is selected manually. The compact device operates under the constant control and supervision of data from the electric network. The specifics of the work depends on the quantity and quality of the voltage in the phases. Using the device, the optimal phase is selected and power is supplied.

Instrument Functions

Using the transmission switching device, the upper and lower voltage parameters are adjusted. The device is pre-configured. Particular attention is required to set the upper indicator. If set too high, internal wiring may overheat. Low-level voltage results in constant tripping of the switch.

The device has a return time function. After a certain period of time, the main power source is checked. If the indicators are normal, a reverse transition to the previous place is done. Or, at the set interval, the voltage is checked again. The process continues until the voltage returns to normal. The time range is set by a specialist. When the voltage disappears in all phases, the on-time function is activated. The interval is also adjusted before operating the device.

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