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High voltage three phase current and voltage sensor assembly system without ground connection and method

Active Publication Date: 2021-07-22
CLEAVELANDPRICE ENTERPRISES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a sensor assembly system that uses a voltage sensor to measure voltage in a power line. The sensor assembly is connected in a "Y" configuration, which eliminates the need for a ground connection and simplifies installation. The system includes three sensor assemblies, and each is connected to the power line by only one end, reducing the length of the voltage divider and saving money. The overall cost savings are significant, and the system eliminates the need for a ground wire and its associated costs. The technical effects of the present invention are improved voltage accuracy and simplified installation with cost savings.

Problems solved by technology

Also, the cost of the second end of the sensor assembly connection hardware to mount to a power line for the phase to phase sensor assembly arrangement is much greater and requires three of these connectors as compared to the single connection of three very small diameter cables from the second end of the phase to neutral sensor assemblies needing only one small connector.

Method used

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  • High voltage three phase current and voltage sensor assembly system without ground connection and method
  • High voltage three phase current and voltage sensor assembly system without ground connection and method
  • High voltage three phase current and voltage sensor assembly system without ground connection and method

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Embodiment Construction

[0019]With reference to FIG. 1, there is shown schematically a power line monitoring system as disclosed in the previously referenced U.S. Pat. No. 9,664,710 B2 and U.S. Pat. No. 9,746,498 B2 which sensor assemblies are connected in a “Y” configuration connected to ground. As can be seen in FIG. 1 there is a phase A—branch 10, a phase B—branch 12, and a phase C—branch 14. Each branch 10, 12 and 14 includes a sensor assembly 101 operatively connected in circuit to the respective phase A, phase B, or phase C of a power line. Each sensor assembly 101 includes a high voltage resistor 309. The three high voltage resistors are connected to a ground wire 16 which is connected to a ground potential reference point 18.

[0020]With reference to FIG. 2, there is shown schematically a power line monitoring system as disclosed in the previously referenced U.S. Pat. No. 9,810,720 B2. As can be seen in FIG. 2 the three phases also have three branches, i.e., phase A to phase B—branch 20, phase B to p...

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Abstract

A sensor assembly system and method for providing good voltage accuracy for monitoring a three phase high voltage power line without connecting to ground. The sensor assembly system comprises three sensor assemblies having reference point ends not connected to ground. All three sensor assemblies are connected together at the reference point ends to create a neutral common reference point not connected to ground potential that is at zero volts when all of the three phases are at the same line voltage.

Description

BACKGROUND OF THE INVENTION[0001]This disclosure relates to an improved current and voltage sensor assembly system and method for monitoring a high-voltage three-phase power line without connecting to ground. Many high voltage sensors have no connection to ground and have no definitive reference point relative to the high-voltage line. These types of high voltage sensors may yield inaccurate values for voltage even if their current measurements are accurate. The present invention provides a stable reference point not connected to ground relative to the three phase power lines and thus overcomes the inherent inaccuracies of these other ungrounded systems that have no definitive reference point relative to the high-voltage line. The present invention also provides a method for powering the current and voltage sensor assemblies through the stable reference point.[0002]Two systems that use sensor assemblies that are connected to ground are disclosed in U.S. Pat. No. 9,664,710 B2, issued...

Claims

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Application Information

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IPC IPC(8): G01R19/22H02J13/00G01R15/20G01R15/18G01R31/58
CPCG01R19/22H02J13/00002G01R31/58G01R15/18G01R15/202H02J3/26G01R19/2513Y04S10/22Y04S10/30Y02E40/70Y02E40/50
Inventor KOWALIK, PETER M.
Owner CLEAVELANDPRICE ENTERPRISES