Current and/or voltage detector for a distribution system

• US 4,999,571 A
• Filed: 04/20/1989
• Issued: 03/12/1991
• Est. Priority Date: 04/22/1988
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Kansai Electric Power Company Incorporated, Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Miura, Akihiro, Kamada, Osamu, Toda, Kazurou, Ishiko, Daisuke
• Primary Examiner(s): Wieder, Kenneth
• Assistant Examiner(s): BURNS, WILLIAM
• Application Number:
  US07/340,934
• Time in Patent Office: 691 Days
• Field of Search: 324/96, 324/117 R, 324/1266, 324/127, 324/142
• US Class Current: 324/96
• CPC Class Codes: G01R 15/142 Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
• CPC Class Codes: G01R 15/24 using light-modulating devices

Abstract

A current and voltage detector for a distribution system is provided with a lower section, an upper section and a fastener for combining the lower and upper sections into one body. The lower section comprises: a first groove for receiving an electric wire of the distribution system; an optical type current sensor; an optical type voltage sensor; and a potential divider for supplying a voltage to the voltage sensor. The upper section comprises: a second groove for receiving the electric wire; and a U-shaped magnetic core for applying a magnetic field to the current sensor.

Claims

1. A current detector for a distribution system, comprising a lower section, an upper section, and a fastening means for combining said lower and upper sections into one body,

said lower section comprising:

a first receiving portion for receiving an electric wire of the distribution system, said first receiving portion being disposed on the upper surface of said lower section; and

an optical type current sensor,

said upper section comprising a second receiving portion for receiving the electric wire, said second receiving portion being disposed on the lower surface of said upper section to face said first receiving portion, said upper section further including a U-shaped magnetic core surrounding said second receiving portion, the two end portions of said magnetic core protruding from the surface of said upper section, said lower section further comprising two recesses for receiving the two end portions of said U-shaped core when said upper and lower sections are combined into one body, and wherein said current sensor means is disposed within the gap of said U-shaped magnetic core when said upper and lower sections are combined into one body.

2. A detector according to claim 1, wherein the position of said current sensor is adjustable.

3. A detector according to claim 1, wherein said current sensor has a magnetic optical sensor element which detects, using the Faraday effect, the strength of a magnetic field generated by the current flowing through the electric wire received in said first and second receiving portions.

4. A detector according to claim 1, wherein an output signal of said current sensor is transmitted outside through an optical fiber.

13. A detector according to claim 1, wherein said first and second receiving portions are for engaging the electric wire.

5. A current and voltage detector for a distribution system, comprising a lower section, an upper section and a fastening means for combining said lower and upper sections into one body,

said lower section comprising:

a first receiving portion for receiving an electric wire of the distribution system, said first receiving portion being disposed on the upper surface of said lower section;

an optical type current sensor; and

an optical type voltage sensor,

said upper section comprising a second receiving portion for receiving the electric wire, said second receiving portion being disposed on the lower surface of said upper section to face said first receiving portion, said upper section further including a U-shaped magnetic core surrounding said second receiving portion, the two end portions of said magnetic core protruding from the surface of said upper section, said lower section further comprising two recesses for receiving the two protruding end portions of said U-shaped core when said upper and lower sections are combined into one body, and wherein said current sensor is disposed within the gap of said U-shaped magnetic core when said upper and lower sections are combined into one body.

6. A detector according to claim 5, wherein the position of said current sensor is adjustable.

7. A detector according to claim 5, wherein said current sensor has a magnetic optical sensor element which detects, using the Faraday effect, the strength of a magnetic field generated by the current flowing through the electric wire received in said first and second receiving portions.

8. A detector according to claim 5, wherein said lower section further comprises a capacitive type potential divider disposed in the vicinity of said first receiving portion, the output voltage of said potential divider being applied to said voltage sensor.

9. A detector according to claim 5, wherein said upper section further comprises a further capacitive type potential divider disposed in the vicinity of said second receiving portion, said further potential divider and said potential divider of said lower section being electrically connected through a connecting means.

10. A detector according to claim 5, wherein said voltage sensor has a sensor element which utilizes the Pockels effect.

11. A detector according to claim 5, wherein at least either of the electrode area and electrode distance of said potential divider is adjustable.

12. A detector according to claim 5, wherein output signals of said current and voltage sensors are transmitted outside through optical fibers.

14. A detector according to claim 5, wherein said first and second receiving portions are for engaging the electric wire.