Circuit condition monitoring system having integral test point

• US 4,794,331 A
• Filed: 10/30/1987
• Issued: 12/27/1988
• Est. Priority Date: 10/30/1987
• Status: Expired due to Term

• Current Assignee: Edmund O. Schweitzer III, Jean E. Schweitzer, Marilyn L. Schweitzer
• Original Assignee: E O Schweitzer Manufacturing Company Incorporated Mundelein
• Inventors: Schweitzer, Edmund O. Jr.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Regan, Maura K.
• Application Number:
  US07/115,166
• Time in Patent Office: 424 Days
• Field of Search: 324/538, 324/133, 439/278, 439/279, 439/281
• US Class Current: 324/133
• CPC Class Codes: G01R 19/14 Indicating direction of current; Indicating polarity of voltage

Abstract

A circuit condition monitoring system for an electrical power distribution system includes a connector component having an integrally formed test point which provides fault current or voltage loss monitoring of a conductor within the connector. The connector includes an electrically conductive outer sheath layer. An annular channel formed on the surface of and extending through this layer receives the cylindrical end of a circuit monitoring module to form an electrically-isolated sheath portion which is capacitively coupled to the system conductor and to the module to function as a test point for providing operating power to the module. An electrically conductive end cap may be provided to cover the test point when a module is not installed.

Claims

1. A connector for establishing an electrical monitoring connection between the electrical terminals of components of an electrical distribution system, comprising:

a connector body portion formed of electrically non-conductive material;

first and second terminal means for electrically and mechanically engaging the electrical terminals of said components;

electrical conductor means extending within said body portion between said first and second terminal means for providing an electrical current path therebetween, said conductor means being substantially surrounded by said body portion;

sheath layer formed of an electrically-conductive material overlying the surface of said body portion; and

means defining a channel in said sheath layer, said channel extending through said sheath layer and into said body portion and forming a closed loop whereby an interior portion of said sheath layer is electrically isolated from said sheath layer and capacitively coupled to said conductor means to provide said electrical monitoring connection.

2. A connector as defined in claim 1 wherein said channel is formed into an annular loop.

3. A connector as defined in claim 2 wherein said channel is generally cylindrical in form and projects generally radially relative to said conductor.

4. A connector as defined in claim 3 wherein substantial portion of the sidewalls of said channel are formed of electrically conductive material.

5. A connector as defined in claim 1 wherein said connector body includes a generally cylindrical portion, and said conductor means are disposed generally axially therein, and said electrically conductive sheath comprises a coaxial layer overlying said generally cylindrical portion.

6. A connector for an electrical power distribution system for establishing an electrical monitoring connection between terminals on one or more components of the system, comprising:

a connector body including a generally cylindrical portion formed of electrically non-conductive material;

first and second terminal means for electrically and mechanically engaging the component terminals;

electrical conductor means extending generally axially within said cylindrical portion between said first and second terminal means for providing an electrical current path therebetween, said conductor means being surrounded by said cylindrical body portion;

a concentric sheath layer formed of electrically-conductive material overlying said cylindrical body portion; and

means defining on the surface of said sheath layer a channel extending in a closed loop through said sheath layer to said body portion, said channel defining a central portion of said sheath layer electrically isolated from said sheath layer and capacitively coupled to said conductor for providing said electrical monitoring connection.

7. A connector as defined in claim 6 wherein substantial portion of the sidewalls of said channel are formed of electrically conductive material.

8. A circuit condition monitoring system for an electrical power distribution system providing an electrical monitoring connection btween the terminals of electrical components within the distribution system, comprising:

a connector body formed of electrically non-conductive material;

first and second terminal means for electrically and mechanically engaging the component terminals;

electrical conductor means extending within said body between said first and second terminal means for providing an electrical current path therebetween, said conductor means being substantially surrounded by said body;

a sheath layer formed of an electrically-conductive material overlying the surface of said body;

a circuit condition monitoring module including a monitoring circuit operable from a capactive coupling to said conductor;

means defining a channel in said sheath layer, said channel extending through said sheath layer and into said body portion and forming a closed loop dimensioned to receive said module, and whereby an interior test point portion of said sheath layer is electrically isolated from said sheath layer and capacitively coupled to said conductor means; and

said module including an internal capacitive coupling element at one end for establishing a capacitive coupling to said test point portion and electrical coupling to said monitored conductor.

9. A monitoring system as defined in claim 8 wherein said ground return means comprise an additional capacitive coupling element.

10. A connector as defined in claim 8 wherein said channel is formed into an annular loop.

11. A connector as defined in claim 10 wherein said channel is generally cylindrical in form and projects generally radially relative to said conductor.

12. A connector as defined in claim 11 wherein substantial portion of the sidewalls of said channel are formed of electrically conductive material.

13. A connector as defined in claim 8 wherein said connector body includes a generally cylindrical portion, and said conductor means are disposed generally axially therein, and said electrically conductive sheath comprises a coaxial layer overlying said generally cylindrical portion.

14. A monitoring system as defined in claim 8 wherein said connector body includes a generally cylindrical portion, and said conductor means are disposed generally axially therein, said electrically conductive sheath layer comprises a coaxial layer overlying said generally cylindrical portion, and said test point socket extends through said sheath such that at least a substantial portion of the bottom of said socket is formed by said non-conductive housing material.

15. A monitoring system for providing an electrical monitoring connection between the terminals of electrical components within an electrical power distribution system, comprising:

a connector body including a generally cylindrical portion formed of electrically non-conductive material;

first and second terminal means for electrically and mechanically engaging the component terminals;

electrical conductor means extending generally axially within said cylindrical portion between said first and second terminal means for providing an electrical current path therebetween, said conductor means being surrounded by said cylindrical body portion;

a concentric sheath layer formed of electrically-conductive material overlying said cylindrical body portion;

means defining a channel in said sheath layer, said channel extending through said sheath layer and into said body portion and forming a closed loop dimensioned to receive said module, whereby an interior portion of said sheath layer is electrically isolated from said sheath layer and capacitively coupled to said conductor to provide a test point; and

a circuit condition monitoring module including a monitoring circuit operable from a capacitive coupling to said conductor, said module including an internal capacitive coupling element at one end for establishing when said module is seated in said socket said capacitive coupling to said conductor, and ground return means for establishing electrical coupling to said sheath layer.

16. A monitoring system as defined in claim 15 wherein said ground return means comprise an additional capacitive coupling element.

17. A monitoring system as defined in claim 15 wherein said ground return means comprise a metallic connection to said sidewall of said test point socket.