Carlos Rojas
New User
- Location
- Bogotá, Colombia
- Occupation
- Electrical Engineer
Hi colleagues,
Currently, we found in a factory building two separated substations, first substation contains a 630kVA 13.2kV/230V transformer and the second substation contains 500kVA 13.2kV/220 transformer. Each substation is grounding by means of its own grounding system (copper grid with rods in a certain nodes). After earth meter measure we validate that 630kVA substation grounding system has a earth resistance of 0.9 Ohms. On the other hand, 500kVA substation grounding system has a earth resistance of 18 Ohms.
Should i bound both 630 kVA substation and 500 kVA substation grounding systems ? or should eliminate 500kVA substation grounding system and connect 500kVA substation through near of 70 m copper wire to 630kVA substation ?
Best regards ¡¡
Carlos Rojas
Currently, we found in a factory building two separated substations, first substation contains a 630kVA 13.2kV/230V transformer and the second substation contains 500kVA 13.2kV/220 transformer. Each substation is grounding by means of its own grounding system (copper grid with rods in a certain nodes). After earth meter measure we validate that 630kVA substation grounding system has a earth resistance of 0.9 Ohms. On the other hand, 500kVA substation grounding system has a earth resistance of 18 Ohms.
Should i bound both 630 kVA substation and 500 kVA substation grounding systems ? or should eliminate 500kVA substation grounding system and connect 500kVA substation through near of 70 m copper wire to 630kVA substation ?
Best regards ¡¡
Carlos Rojas