The Pylon Box C.A 6474 from Chauvin Arnoux is a special extension for the earthing and earth resistance meter C.A 6472, enabling earthing measurements on high-voltage pylons equipped with an earth wire. The measurement is performed during operation without interrupting the line. The box serves as a connection module that receives measurement signals from four flexible AmpFLEX current transformers and forwards them to the main measuring device C.A 6472. This solution is designed for testing the earthing quality of high-voltage pylons in power supply, particularly in transmission network technology.

Applications

The Pylon Box is used to check the electrical earthing of high-voltage pylons, especially in networks with earth wires. It is suitable for pylons of different constructions, as the flexible AmpFLEX sensors adapt to the geometry of the pylon feet. Measurements are carried out without operational interruption, ensuring the availability of the line. The application is primarily in the field of network infrastructure, during maintenance and inspection work on high-voltage lines.

Functions and Equipment in Detail

The Pylon Box enables the simultaneous capture of multiple parameters: the total earthing resistance of the pylon, the resistance of each individual pylon foot, the total impedance of the line, and the impedance of the chain link via the earth wire. The four flexible AmpFLEX current transformers, each with a loop length of 8 m, are placed around the pylon feet to capture current flow. The measurement can be performed actively, where the C.A 6472 supplies the measurement current, or passively, by utilizing interference voltages from the network. The box is thus suitable for various measurement strategies.

Technology Explained Simply

The AmpFLEX sensors are flexible current transformers that measure the current in the pylon feet without requiring physical connection. The Pylon Box collects the signals from the four sensors and transmits them to the C.A 6472, which calculates the resistance values. The measurement is performed in the frequency range of 41 Hz to 5.018 Hz, which is typical for earthing measurements to minimize interference from the network. The measurement range extends from 0.001 Ω to 99.99 kΩ, with a resolution of 0.001 Ω up to 10 Ω. The voltage range specification of 16 to 32 VRMS refers to the measurement voltage used for earthing measurements. The protection rating IP53 means the device is protected against dust and splashing water, making it suitable for outdoor use.

Compatibility and Accessories

The Pylon Box is specifically developed for use with the earthing meter C.A 6472. The four AmpFLEX sensors are included in the delivery and are designed for a loop length of 8 m. The box is not intended for use with other measuring devices. Compatibility is limited to the C.A 6472 system, with the sensors directly connected to the box.

Installation and Mounting

Installation is performed by wrapping the four AmpFLEX sensors around the pylon feet. The sensors are flexible and adapt to different diameters and shapes. The Pylon Box is then connected to the C.A 6472. Measurement can begin immediately once the connections are established. No additional tools or aids are required.

Operational Advantages

The Pylon Box enables fast and efficient measurement without operational interruption. The simultaneous capture of multiple parameters reduces measurement time and increases accuracy. The flexible adaptation of the AmpFLEX sensors to different pylon constructions increases applicability. The IP53 protection rating ensures safe outdoor use, even in light rain. The measurement requires minimal effort, as no additional connections or auxiliary lines are needed.