Practical Power Plant Engineering

6Site and Equipment Grounding

CHAPTER MENU

• 6.1 Requirements
  • 6.1.1 Grounding Grid Design
  • 6.1.2 Soil Conditions
  • 6.1.3 Test Measurements
• 6.2 Ground Potential Rise and Step and Touch Potential
  • 6.2.1 Ground Potential Rise (GPR)
  • 6.2.2 Step Potential
  • 6.2.3 Touch Potential
  • 6.2.4 Reducing Step and Touch Potential Hazards
  • 6.2.5 Human Tolerance
• 6.3 Computer Study Report
  • 6.3.1 The Study
• 6.4 Below Ground Equipment Grounding
  • 6.4.1 Connections to Rebar
  • 6.4.2 Foundation Grounding (Ufer)
• 6.5 Above Ground Equipment Grounding
• 6.6 Telecommunications in HV Substations
• 6.7 Fence Grounding
• 6.8 Plant Control System Grounding
• 6.9 Overhead Line Grounding
• 6.10 Remote Site Grounding
• 6.11 Effect of Overhead Ground Wires and Neutral Conductors
• References

6.1 Requirements

The grounding system must provide reliable and safe means of equipment grounding in order to

• Provide a low resistance path for the dissipation of ground fault currents, lightning, and switching surges into the earth without exceeding any operating and equipment limits.
• Minimize the ground potential rise (GPR) between the equipment and the soil within safe limits throughout the site for the protection of the operating personnel and equipment.
• Provide a reasonably uniform potential rise in all parts of the plant to minimize the step and touch potentials throughout the plant for the protection of the plant personnel.
• Properly channel the ground fault and unbalanced currents to reduce electrical noise in the communication and data cables. ...