System for rating electric power transmission lines and equipment
First Claim
1. A sensing device adapted to be clamped to an electrically energized overhead electric power line, comprising:
- a housing;
sensing means in said housing;
first and second jaws carried by said housing, said jaws being shiftable relative to each other from a closed position clamping said line therebetween and an open position releasing said line from jaws;
power supply means carried by said housing for supplying electrical power to said sensing means, said power supply means including an electrical transformer for supplying electrical current to said sensing means, said transformer including a magnetic core for inductively coupling said line with said transformer when said jaws are in said closed position thereof;
said magnetic core including first and second core portions shiftable relative to each other,at least said first jaw being shiftable relative to said housing and mounted thereon; and
said first core portion connected to said first jaw.
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Accused Products
Abstract
A system for determining the current carrying capability of one or more overhead power transmission lines monitors one or more spans of each line on real-time basis and identifies the span having the lowest current carrying capacity which in turn establishes the maximum capacity of the entire line. The thermal state of each monitored line span is determined by measuring the conductor temperature, line current, solar radiation, ambient temperature, and in some cases wind speed and wind direction. These parameters are monitored by a sensor-transmitter unit that may be removably clamped on the line conductor which may range in size from one to several inches in diameter, and includes a radio transmitter for transmitting sensed data to a receiving substation. The data from the sensor-transmitter is multiplexed and transmitted by a telecommunications link to a computer which automatically determines line capacity using the real-time data and also calculates the time required for the "critical span" having the lowest current capacity to reach its maximum safe temperature based on any of a number of step changes in load demands. Each sensor-transmitter may include sensors for monitoring the current level, conductor temperature, solar radiation impinging on the conductor, ambient temperature, wind direction and velocity and conductor sag. These sensors and the transmitter are enclosed in a corona-free housing and are powered by a power supply that includes a transformer core which surrounds and is inductively coupled with the monitored conductor.
125 Citations
49 Claims
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1. A sensing device adapted to be clamped to an electrically energized overhead electric power line, comprising:
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a housing; sensing means in said housing; first and second jaws carried by said housing, said jaws being shiftable relative to each other from a closed position clamping said line therebetween and an open position releasing said line from jaws; power supply means carried by said housing for supplying electrical power to said sensing means, said power supply means including an electrical transformer for supplying electrical current to said sensing means, said transformer including a magnetic core for inductively coupling said line with said transformer when said jaws are in said closed position thereof; said magnetic core including first and second core portions shiftable relative to each other, at least said first jaw being shiftable relative to said housing and mounted thereon; and said first core portion connected to said first jaw. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A device for sensing a parameter related to the electrical current carrying capacity of an overhead power line, comprising:
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a housing; means on said housing for clamping said housing on said line; a sensing element for sensing said parameter when said housing is clamped on said line by said clamping means; said housing including means for reducing arcing between said housing and said line when said device is installed on said line; and means for shiftably mounting said sensing element on said housing, including means for biasing said sensing element into contact with said line. - View Dependent Claims (40, 41, 42, 43, 44)
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45. A sensing device adapted to be clamped to an overhead electrical power line, comprising:
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a housing including first and second halves, said halves respectively including opposing compartments therein; a shiftable jaw for clamping said housing on said line; electrical means for sensing a parameter related to the capacity of said line to carry electrical current; first and second electrical circuits respectively disposed in said first and second compartments and connected with said sensing means for controlling the operation of said device; first means for mounting said jaw for movement between said housing halves; said housing including means for reducing arcing between said housing and said line when said device is installed on said line; and second means for mounting said first means and said first and second circuits in said housing, including a pair of opposing spaced apart plates. - View Dependent Claims (46, 47, 48, 49)
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Specification