Impedance of multigrounded neutrals on rural distribution systems

Author

Rajotte, Yves ; Fortin, Jacques ; Raymond, Georges

Author_Institution

Hydro-Quebec, Canada

Volume

10

Issue

3

fYear

1995

fDate

7/1/1995 12:00:00 AM

Firstpage

1453

Lastpage

1459

Abstract

Hydro-Quebec has conducted field tests to study the impedance of multigrounded neutrals on rural distribution systems. Phase-to-neutral faults were staged at different locations along a 25 kV line and the field test results are reported. A simplified computer model implemented on EMTP gives results very close to those yielded by field tests. The main conclusion is that customers´ grounding systems determine the impedance of multigrounded neutrals. Test results also show that the current is shared more or less equally between the neutral conductor and the sheaths of CATV and telephone cables. Overvoltages on phase conductors during phase-to-neutral faults were also measured and results are presented

Keywords

digital simulation; distribution networks; earthing; electric impedance measurement; overvoltage; overvoltage protection; power system analysis computing; power system measurement; power system protection; software packages; voltage measurement; 25 kV; EMTP; computer model; field test; impedance measurements; multigrounded neutrals; overvoltages; phase conductors; phase-to-neutral faults; power systems; rural distribution systems; Circuit faults; Communication cables; Conductors; Grounding; Impedance; Phase measurement; Surges; Telephony; Testing; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.400929

Filename

400929