2P18U3/60

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The 2P18U3/60 device is a voltage dependent automatic insulation device that can be used in high-voltage electricity distribution and transformer systems. It is commonly used to protect secondary equipment, such as transformers and overhead line equipment, as well as primary substation equipment like cables, circuit breakers and switchgear. The device is made up of two separable units, the external unit and the internal unit.

The external unit houses the voltage sensing coil and the output contact, usually a relay or contactor. The internal unit contains the voltage dependent circuit, typically composed of an analog resistance, a voltage surge suppressor, and other components. The internal unit is connected to the external unit through two lines, normally consisting of a low voltage depending on the application but occasionally a higher voltage.

The 2P18U3/60 can be used in both single-phase and three-phase systems, and is most often used in conjunction with other protection systems for the overall protection of a distribution network. The most common application for this type of device is in the protection of new or upgraded lines or other equipment, providing protection against overvoltage transients such as lightning strikes, and local faults.

The working principle of 2P18U3/60 device depends on the operation of its voltage sensing coil. When an overvoltage appears, the coil receives some of the voltage and allows the operation of the internal unit elements, such as the voltage surge suppressor. This triggers the relay or contactor, which then shuts off the electricity supply to protect the equipment from damage.

When an overvoltage does not appear, the coil is unmoved and does not affect the internal elements. This prevents unnecessary or premature triggering of the 2P18U3/60 device, preserving the reliability and stability of the system. Additionally, the device has an adjustable voltage setting, so that users can adapt the device to the specific application.

In summary, the 2P18U3/60 device is an essential component for the protection of electrical equipment such as transformers, overhead lines, and primary substation equipment in high-voltage electricity distribution systems. Its operation depends on a voltage sensing coil, which, when activated, triggers a relay or contactor to shut off the electricity supply and prevent further damage from overvoltage transients.

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