Answer / akshay chauhan

High Resistance Grounding (HRG) is a method where high resistance is connected between a system's neutral point and ground to limit ground fault current, usually to less than 10 amps, allowing the system to continue operating during a single ground fault while protecting equipment.

Selection Criteria:
System Voltage: Suitable for low (up to 600V) and medium-voltage (up to 15kV) systems.
Fault Current Limit: Typically limits fault current to 5-10 amps.
Neutral Availability: Requires an accessible neutral point (e.g., wye transformer).
System Continuity: Used where continuous operation during faults is critical.
Ground Fault Detection: Should include monitoring for fault identification.

What is the significance of %Z in case of transformer?

1 Answers  

---

what is the function of supervison relay?Draw its wiring diagram.

2 Answers   IBM, R.R. ISPAT LIMITED,

---

only some transformers and some generator requires NGR why?

1 Answers  

---

where is core-type and shell-type construction suitable for transformers ?

0 Answers  

---

Why air gap in rotating machines should be small?

3 Answers  

---

how to select a cap,when a fan is required 2.5 micro ferad cap,then how we know about 1 hp motor?

1 Answers  

---

What is an Automatic Voltage Regultor & what is its use? What are the general componets we use to design an Automatic Voltage Regulator..What are the factors to be considered for its design?

3 Answers  

---

What is the difference between bundled conductors and double circuit?

1 Answers   Power Grid,

---

where we use 1 phase & 3 phase supply ?what is major advantage using 3 phase over than single phase ?

3 Answers  

---

What is neutral earth voltage of transformer and what should be the value

3 Answers  

---

How can we calculate the cable size??? plz give the formula !!!!!

3 Answers  

---

What is the need of black rock stones under the transformer yard?

5 Answers   TNEB Tamil Nadu Electricity Board,

---