Neutral-earthing resistor measurement interface

What it represents

Identifies the measurement connection associated with the selected neutral-earthing resistor system. Earthing and lightning interfaces identify the connections between equipment metalwork, primary protection devices and the station earthing network. Their electrical purpose differs from their physical conductor route or electrode geometry.

In a switchyard arrangement, the earthing references help connect each primary equipment structure and surge-protection device to the correct earth-grid interface. Separate details show actual joints, sizes and installation routes. For this reference, the drawing identifies “Neutral-earthing circuit measurements” at the input and “Resistor system monitoring” at the output. Resistance and thermal duty follow the earthing design.

Name every connected item and the earthing design reference. The illustrative connection does not establish touch or step voltages, conductor sizing, lightning coverage or safe working conditions. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

How to read it

• Start at the named input: Neutral-earthing circuit measurements. Identify its source device or document and the state represented on the drawing.
• Follow the named output: Resistor system monitoring. Cross-reference its destination and separate the command from confirmation that the equipment responded.
• Resistance and thermal duty follow the earthing design.
• Name every connected item and the earthing design reference. The illustrative connection does not establish touch or step voltages, conductor sizing, lightning coverage or safe working conditions.

Information to show or reference

• Label the source and connection reference for neutral-earthing circuit measurements.
• Identify the destination and defined state of resistor system monitoring.
• Record the equipment or control-document revision supporting this functional block.
• Check this application limit in the project design: Resistance and thermal duty follow the earthing design.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

About this graphic

This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.

SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.