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Home » Step Potential

Step Potential

09/08/2019 By Ian Leave a Comment

Earthing System Design Procedure A Probabilistic Approach

Earthing System Design A Probabilistic Approach

What are the procedures for creating an HV Earthing System Design? Also, how might these differ from an LV Earth design?

Firstly, although the principles underpinning HV and LV earthing are similar, the approaches are very different.

Probabilistic Approach

The first huge difference is the recognition that HV electrical earthing design is probabilistic in nature. Whereas LV earthing is far less so. 

What do I mean?

[Read more…] about Earthing System Design Procedure A Probabilistic Approach

Filed Under: Earthing System Design Tagged With: CDEG HIFREG Software, Earthing Arrangements, earthing design, earthing systems, HV Earthing Protection, Step Potential, Step Voltage, Touch Potential, Touch Voltage

21/05/2018 By Ian Leave a Comment

Rise of Earth Potential (RoEP) Know the Risks

Rise of Earth Potential Risk Site - Sub Station

Awareness of step and touch potential, caused by a rise of earth potential. Is essential for anyone working on high-voltage power transmission and distribution systems above 1 kV.

A rise of earth potential

A rise of earth potential is caused by electrical faults that occur at electrical substations. Power plants, or high-voltage transmission lines. Therefore, short-circuit current flows through the plant structure. And equipment and into the earthing electrode.  Since the Soil Resistivity is not zero. Therefore, any current injected into the earth at the earth electrode produces a ‘Rise of Earth Potential’. This earth potential rise (EPR) is concerning an infinitely distant reference point. The resulting rise of earth potential can cause hazardous voltage. And, many hundreds of metres away from the actual fault location. Thus, many factors determine the level of hazard. Including available fault current. And, soil type, soil moisture, temperature, underlying rock layers. Also, clearing time to interrupt the fault.

[Read more…] about Rise of Earth Potential (RoEP) Know the Risks

Filed Under: Electrical Earthing Tagged With: Charles Dalziel, earth potential rise, EPR, Rise of Earth Potential, ROEP, Step Potential, Step Voltage, Touch Potential, Touch Voltage

17/10/2016 By Ian Leave a Comment

What is Step and Touch Potential And How Can You Reduce its Risk?

touch potential voltage

Awareness of step potential and touch potential risks, caused by an earth potential rise. Is vital for anyone working on high-voltage power transmission. Also, distribution systems above 1 kV.

Earth Potential Rise

Earth Potential Rise (EPR) is caused by electrical faults that occur at

  • electrical substations,
  • power plants,
  • or high-voltage transmission lines.

Therefore short-circuit current flows through the plant structure and equipment and into the earthing electrode. 

Since the Soil Resistivity is not zero. Therefore, any current injected into the earth at the earth electrode produces a Rise of Earth Potential. This EPR earth potential rise is concerning an infinitely distant reference point. The resulting EPR earth potential rise can cause hazardous voltage, many hundreds of metres away from the actual fault location. However, many factors determine the level of hazard. Including available fault current. Also, soil type, soil moisture, temperature, underlying rock layers. And the clearing time to interrupt the fault.

[Read more…] about What is Step and Touch Potential And How Can You Reduce its Risk?

Filed Under: Electrical Earthing Tagged With: Charles Dalziel, earth potential rise, EPR, GPR, Rise of Earth Potential, ROEP, Step Potential, Step Voltage, Touch Potential, Touch Voltage

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