Transponder unit for measuring temperature and current on live transmission lines

• US 4,384,289 A
• Filed: 01/23/1981
• Issued: 05/17/1983
• Est. Priority Date: 01/23/1981
• Status: Expired due to Fees

• Current Assignee: Niagara Mohawk Power Corporation (National Grid PLC)
• Original Assignee: General Electric Company
• Inventors: Fernandes, Roosevelt A., Stillwell, Howard R.
• Primary Examiner(s): Groody, James J.
• Application Number:
  US06/227,809
• Time in Patent Office: 844 Days
• Field of Search: 340/870.17, 340/584, 340/595, 340/596, 73/359 R, 73/362 R, 73/340, 73/342, 324/126, 324/127, 374/179, 374/170
• US Class Current: 340/870.17
• CPC Class Codes: G01K 1/024 for remote indication
• CPC Class Codes: G01K 1/143 for measuring surface temperatures
• CPC Class Codes: G01R 1/22 Tong testers acting as secondary windings of current transformers
• 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 15/26 using modulation of waves other than light, e.g. radio or acoustic waves

Abstract

A toroidal shaped transponder unit is connected to a live power transmission line by means of a tripping mechanism and a hinge assembly. The unit includes means for sensing the temperature and current of the power transmission line and for transmitting the information to a local receiver. The toroid housing includes an open frame mounting hub and spoke assembly for mounting the sensors without interfering with the thermodynamics of the transmission line. The unit further includes a power coil and core assembly for receiving magnetic emanations from the transmission line and generating power to operate the electronic components within the unit.

Claims

1. A method for monitoring the operating temperature of a power transmission line comprising the steps of:

separating the two halves of a circular housing containing a temperature sensor and a spring loaded trip mechanism;

at least partially encompassing a power transmission line with said two housing halves;

contacting said trip mechanism with said transmission line causing said spring to force the two halves into contact and to cause said temperature sensor to come in thermal contact with said power transmission line.

2. The method of claim 1 including the step of securing said two housing halves to each other and to said transmission line.

3. A transponder unit for monitoring the conductor temperature of a power transmission line, said transponder unit comprising, in combination:

A. a toroidal-shaped, conductive housing consisting of two semi-annular housing sections;

B. a cylindrical hub consisting of two semi-annular hub sections;

C. angularly spaced spokes separately interconnecting said hub sections to said housing sections;

D. a hinge mechanism interconnecting said housing sections for swinging movement between a relatively open position to admit a transmission line to the open interior of said hub and a relatively closed position with said hub embracing the transmission line to mount said transponder unit thereon;

E. at least one temperature sensing probe carried by said housing and extending radially through an opening in said hub into thermally coupled relation with the transmission line; and

F. electronic signal transmission means accommodated in said housing for wireless communication to a remote location of conductor temperature data obtained by said probe.

4. The transponder unit defined in claim 3, wherein said hub sections are apertured to ventilate the interior of said hub.

5. The transponder unit defined in claim 3, which further includes an annular magnetic sensing coil mounted within said housing for providing an indication of the current flowing in the transmission line.

6. The transponder unit defined in claim 3, which further includes an iron core split loop mounted within said housing and linked with the electromagnetic field associated with the flow of current in the transmission line, and a secondary winding on said core in which is induced operating voltage for said signal transmission means.