METHOD AND APPARATUS FOR MEASUREMENT OF GROUNDING IMPEDANCE - Nippon Telegraph and Telephone Corporation

Title:

METHOD AND APPARATUS FOR MEASUREMENT OF GROUNDING IMPEDANCE

Document Type and Number:

Japanese Patent JP3233334

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To measure the grounding impedance of a grounding electrode, to be measured, without installing a new grounding electrode.
SOLUTION: A part in which a low impedance can be expected such as an existing grounding electrode, a return ground at a distribution line, an iron reinforcing rod at a building, a steel frame at a building or the like is used as an auxiliary grounding electrode 2. A current is applied, from an AC current source, across the auxiliary grounding electrode 2 and a grounding electrode 1 to be measured. A voltage which is generated across the auxiliary grounding electrode 2 and the grounding electrode 1 to be measured is measured. The maximum value of the grounding impedance of the grounding electrode to be measured is measured on the basis of the voltage and the current.

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Inventors:

Noriyuki Sato
Kazuo Hamari

Application Number:

JP7932196A

Publication Date:

November 26, 2001

Filing Date:

March 08, 1996

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

G01R27/20; (IPC1-7): G01R27/20

Domestic Patent References:

JP5393072A
JP56169260U
JP5376879U

Attorney, Agent or Firm:

Tsuneaki Nagao

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