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Patent Searching and Data

Document Type and Number:
Japanese Patent JPH0772191
Kind Code:

PURPOSE: To measure the resistance at the junction part of a transmission line path in live wire state by feeding bias current to a light emitting diode, converting the voltage drop of an object to be measured into light, and then transmitting it to an optical fiber.

CONSTITUTION: A voltage drop (e) generated at the junction resistance of a junction part J supplies current to a resistance R. However, the resistance R>> junction resistance is established and the voltage (e) is generated at both terminals of the resistance R so that the quantity of emission of the light emitting diode LED changes according to the voltage (e). The light emitted by the LED is transmitted to a display via an optical fiber O.F and is displayed after light-electricity conversion and operation to resistance by detection voltage and current value. Since the detection part is driven by a battery, it can be laid out closer to a measurement part and light detected near a junction part J can be transmitted by lifht, thus achieving measurement on a live wire stably and safely even in a high-voltage transmission line path. A current (i) of the line can be measured by a clamp ammeter and transmitted to the display by light.

Application Number:
Publication Date:
March 17, 1995
Filing Date:
August 31, 1993
Export Citation:
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International Classes:
G01R27/02; G01R27/16; (IPC1-7): G01R27/16; G01R27/02
Attorney, Agent or Firm:
Kazuo Sugiyama