GTCS25-750M-R02

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Gas Discharge Tube Arresters (GDTs) are commonly used in power systems to protect from the transient overvoltages generated by lightning or switching operations. They generally consist of a main discharge tube, which is connected in parallel with a protector, also known as a spark gap. The GTCS25-750M-R02 is a type of GDT typically used in medium voltage applications.

The GTCS25-750M-R02 is designed for use in AC circuits, with a rated maximum continuous voltage of 750 volts. Its main discharge tube is made of Mica and it includes protection networks. It is typically used for the protection of medium-voltage equipment and power supplies, and for the detection of high voltage transients.

The principle of operation of the GTCS25-750M-R02 is based on the GDT vacuum effect or vacuum tube effect. This effect occurs when an external electric field is applied between two electrodes, which are separated by a vacuum. The vacuum has a negative electron affinity and creates an electric field within it, known as the Townsend or space charge region. When a gap between the electrodes becomes too small or a voltage between them surpasses a certain threshold, the vacuum effect is triggered. The electric field between the electrodes increases and a spark is created.

When the GTCS25-750M-R02 is installed in a power system, it is connected in parallel with a protector, also known as a spark gap. The spark gap is connected between the power supply and the protected equipment, and it is designed to divert the current around the GDT and to the ground. When a lightning strike or switching operation occurs, the surge voltage increases. The spark gap of the GTCS25-750M-R02 then triggers the GDT vacuum effect, which causes it to activate and dissipate the surge current before it can reach the protected equipment.

The GTCS25-750M-R02 also includes protection networks that are designed to detect sudden changes in voltage or current. These networks are made up of metal oxide varistors (MOVs), spark gaps, and capacitors. When a high energy surge or transient occurs, these components redirect the surge current and dissipate it as heat. The protection networks also help to mitigate the effects of false high voltage switches generated by motor starts.

In summary, the GTCS25-750M-R02 is a type of Gas Discharge Tube Arrester usually used for the protection of medium-voltage equipment and power supplies. Its main discharge tube is made of Mica and it includes protection networks that are made up of MOVs, spark gaps, and capacitors. It works by triggering the GDT vacuum effect when a lightning strike or switching operation occurs, which causes it to activate and dissipate the surge current before it can reach the protected equipment.

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