WO2013166428A1 - Capteur de courant comportant une pince de tension intégrée - Google Patents

Capteur de courant comportant une pince de tension intégrée Download PDF

Info

Publication number
WO2013166428A1
WO2013166428A1 PCT/US2013/039528 US2013039528W WO2013166428A1 WO 2013166428 A1 WO2013166428 A1 WO 2013166428A1 US 2013039528 W US2013039528 W US 2013039528W WO 2013166428 A1 WO2013166428 A1 WO 2013166428A1
Authority
WO
WIPO (PCT)
Prior art keywords
current sensor
conductor
core
core segment
voltage clamp
Prior art date
Application number
PCT/US2013/039528
Other languages
English (en)
Inventor
Steven A. Shaw
Jashbhai S. Patel
Hoan D. Le
Original Assignee
Abb Technology Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Technology Ag filed Critical Abb Technology Ag
Publication of WO2013166428A1 publication Critical patent/WO2013166428A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/22—Tong testers acting as secondary windings of current transformers

Definitions

  • the present application relates to a current sensor for measuring the properties of electricity flowing through a power conductor and powering downstream electronic metering devices.
  • Current sensors are used in power measurement applications, in conjunction with downstream electronic metering devices.
  • Current sensors include transformers that "step down" the current to a standardized value that can be handled by the metering devices.
  • Current sensors monitor load current on the secondary side of pole-mounted and pad-mounted transformers in low voltage applications.
  • a current sensor for measuring properties of electricity flowing in a conductor having:
  • a second core segment having at least one end face, the first and second core segments forming a core when the at least one end face of the first core segment adjoins the at least one end face of the second core segment; [0008] a secondary winding disposed around the second core segment, the secondary winding electrically connected to an electronic metering device; and
  • a voltage clamp operable to pierce the insulation and thereby couple with the conductor, the voltage clamp electrically connected to the conductor when coupled with the conductor,
  • Figure 1 is a front view of a case enclosing a current sensor and integral voltage clamp embodied in accordance with the present invention
  • Figure 2 is a side sectional view of the current sensor enclosed in the case
  • Figure 3 is a side sectional view having a portion of the case removed to show the split core of the current sensor
  • Figure 4 is a side view of the case, showing the integral voltage clamp and secondary cables
  • Figure 5 is a top view of the current sensor and integral voltage clamp; and [0018] Figure 6 is a schematic view of a current sensor and integral voltage clamp connected to a secondary cable of a pole-mounted transformer mounted on a utility pole.
  • a current sensor 100 having an integral voltage clamp 50 is depicted.
  • the current sensor 100 is utilized in an outdoor low voltage power distribution system.
  • low voltage refers to a power system for distributing electricity that measures approximately 600 Volts or less and "outdoor” means “not in a building.”
  • the current sensor 100 is disposed in a case 30 having a cover section 10 and a base section 20.
  • the case 30 is formed from a thermosetting material, thermoplastic material, or a metal.
  • the cover section 10, moveable about a hinge 28, is shown in an open position in relation to the base section 20 in Fig. 1.
  • the integral voltage clamp 50 extends laterally from a side of the case 30, as shown in Figs. 4 and 5.
  • the voltage clamp 50 is integrated structurally with the current sensor 100.
  • the structural integration between the current sensor 100 and voltage clamp 50 is due to the current sensor 100 and the voltage clamp 50 sharing the same housing, the case 30.
  • the voltage clamp 50 is an extension of the case 30, and formed from the same material as the case 30.
  • the current sensor 100 has a split-core made up of a first core segment 15 and a second core segment 25.
  • the first core segment 15 is generally C- shaped and the second core segment 25 is generally U-shaped.
  • the first and second core segments 15, 25 each have at least one end face 22, 24 that, when adjoined, form a completed core.
  • the at least one end faces 22, 24 are adjoined in full and even contact when the cover and base sections 10, 20 of the case 30 are in a closed position.
  • the first core segment 15 is disposed within the cover section 10 of the case 30 and the second core segment 25 is disposed within the base section 20 of the case 30.
  • the generally curved shape of an inside portion of the first and second core segments 15, 25 forms a passage 42 through the center of the adjoined first and second core segments 15, 25 of the completed core.
  • the passage 42 through the core allows a conductor 80 such as a power line, a sensor primary input cable, or a transformer secondary output cable to further pass through to an aperture 26 of the integral voltage clamp 50.
  • the first and second core segments 15, 25 are made up of layers of metal strips or a stack of metal plates, formed from ferromagnetic material, such as grain- oriented silicon steel or amorphous steel.
  • the second core segment 25 has a secondary winding 77 mounted thereon.
  • the secondary winding 77 is wound upon a bobbin 68 that surrounds a portion of the second core segment 25.
  • the secondary winding 77 may be embodied as two windings, each wound upon a bobbin 68 as depicted in Fig. 2.
  • the secondary output of a pole-mounted transformer 150 being monitored by the current sensor 100 becomes the primary in relation to the secondary winding 77 of the current sensor 100.
  • the case 30 is molded to accommodate the shape of the first and second core segments, 15, 25, respectively.
  • the case 30 is molded to provide a snug fit for the first and second core segments 15, 25, requiring only an adhesive to hold the first and second core segments 15, 25 in place.
  • the first core segment, 15 is positioned against a first compression spring 85 that acts along with an internal portion of the cover section 10 of the case 30 to hold the first core segment 15 in place.
  • the first core segment 15 is not rigidly fixed to the cover section 10 of the case 30, but rather is free floating and held in place by the force of the first compression spring 85 acting against the force generated when the core faces 22, 24 of the first and second core segments 15, 25 are adjoined.
  • the second core segment 25 is held in place by a compression spring 66 mounted on an inside surface of the base section 20 of the case 30.
  • the second core segment 25 is further potted in the case 30 using an epoxy or a polymeric material.
  • the second core segment 25 may be encased in the base section 20 in a hydrophobic cycloaliphatic epoxy resin (HCEP).
  • HCEP hydrophobic cycloaliphatic epoxy resin
  • APG automatic pressure gelation
  • the second core segment 25 is joined to an inside surface of a bottom portion 40 of the base section 20 of the case 30 using only an adhesive and without the use of a second compression spring 66.
  • the case 30 When the case 30 is in a closed position, the outer edges of the cover and base sections are in contact, the at least one end faces of the core are in full and even contact, and a core-enclosing gasket 45 that surrounds the edge surfaces of the at least one end faces 22, 24 of the first and second core segments 15, 25 is compressed.
  • the gasket has a generally square shape with rounded edges and surrounds edge surfaces of the first and second core segments 15, 25.
  • the gasket is formed from ethylene propylene diene monomer (EPDM) or another type of material having similar properties.
  • EPDM ethylene propylene diene monomer
  • the closed case 30 and core-enclosing gasket 45 render the split-core impervious to water, moisture, ultraviolet rays, wind, particulate matter, and other environmental and weather-related intrusions.
  • the bottom portion 40 of the case 30 is rendered impervious to the aforementioned intrusions by a circumferential gasket 59 that fits in a recess formed slightly inside a top edge of the bottom portion 40 of the case 30.
  • a bottom edge of the base section 20 contacts the opposing side of the circumferential gasket 59.
  • a silicone grease is applied to teeth 34 of a second jaw 54 of the voltage clamp 50 to provide a weather-proof and contaminant barrier to the teeth 34.
  • the case 30 is secured by a clip 62 formed from the same material as the case 30.
  • the clip 62 extends downward from the cover section 10 of the case 30.
  • the clip 62 has a protrusion 55 that engages with a groove 64 formed in the base section of the case 30.
  • the case 30 may be secured using other means without departing from the inventive scope set forth herein.
  • Fig. 3 a portion of the case 30 is removed to show a sectional view of the split core and the integral voltage clamp 50.
  • the voltage clamp 50 extends laterally from the side of the case 30.
  • the voltage clamp 50 has first and second jaws 52, 54, each having an arcuate edge surface. When the first and second jaws 52, 54 are in a closed position, the arcuate edge surfaces form an aperture 26 as best depicted in Fig. 1.
  • the first and second jaws 52, 54 when in a closed position act, as a vice to grip the conductor 80.
  • the second jaw 54 has teeth 34 formed from a metal or other conductive material, extending vertically from the second jaw 54.
  • the teeth 34 pierce the insulation of the conductor 80 that extends through the aperture 26.
  • Two, three or more teeth 34 are installed in the second jaw 54.
  • the teeth 34 pierce through the layer of insulation surrounding the conductor 80.
  • the teeth 34 after piercing through the insulation, directly contact the copper, aluminum or other conductive material of the conductor 80, and are electrically connected to the conductor 80.
  • the teeth 34 of the voltage clamp 50 thereby couple with the conductor 80, and the voltage clamp 50 is electrically connected to the conductor 80 when the coupling between the teeth 34 and the conductor 80 are achieved.
  • a secondary cable 72 having three leads has two leads of the three leads connected to the secondary winding 77 and the remaining lead is connected to the teeth 34.
  • the secondary cable 72 electrically connects the teeth 34, and thereby the conductor 80, to downstream electronic metering devices 140 through a meter cable 125.
  • the two leads of the secondary cable 72 are connected on one end to the secondary winding 77, and further connect to two conductors of the meter cable 125 to power a current measuring portion of the electronic metering device 140.
  • the remaining lead of the secondary cable 72 connected on one end to the teeth 34 is further connected to a third conductor of the meter cable 125 to power a voltage sensing portion of the electronic metering device 140.
  • the downstream electronic metering devices 140 are directly powered by the current sensor 100 having the electrical connection to the conductor 80.
  • the first jaw 52 of the voltage clamp 50 is held in place by a bolt 48 that threadably engages with a bore that runs the length of the first jaw 52 and into the second jaw 54.
  • the first jaw 52 is released and moved upward from a closed and secured position by turning the bolt 48 counterclockwise.
  • the bolt 48 may be loosened and does not need to be removed from the bore in order to lift the first jaw 52 and position the conductor 80 within or remove the conductor 80 from the aperture 26.
  • a single-phase pole-mounted distribution transformer 150 is mounted to a utility pole 110.
  • a power conductor 112 is connected to a primary bushing 115 of the pole-mounted distribution transformer 150.
  • the secondary terminals 91, 92, 93 or outputs of the transformer 150 may each be attached through conductors 80 to a current sensor 100 having an integral voltage clamp 50.
  • two current sensors 100 having integral voltage clamps 50 are installed on a single-phase pole-mounted transformer 150 at an associated secondary output cable 80 of the transformer 150, as depicted in Fig. 6.
  • the current sensor 100 having an integral voltage clamp 50 may be adapted for use with single- and three-phase pad- mounted transformers.
  • the current sensor 100 and voltage clamp 50 may be installed upon an energized conductor 80 by moving the cover section 10 of the case 30 to an open position, loosening the bolt 48 from the bore formed in the first and second jaws 52, 54 and moving the first jaw 52 away from the second jaw 54.
  • the conductor 80 is then passed through the passage 42 formed between the adjoined first and second core segments 15, 25 and the aperture 26 formed by the partially open first and second jaws 52, 54.
  • the first jaw 52 is then moved toward the second jaw 54 and the bolt 48 is threadably engaged with the bore of the first and second jaws 52, 54.
  • the first and second jaws 52, 54 firmly grip the conductor and the teeth 34 of the second jaw 54 pierce the insulation of the conductor 80.
  • the bolt 48 is then tightened until it is secured in the bore.
  • the current sensor 100 installation is complete upon the conductor 80 and does not require additional mounting or precise positioning. Since the voltage clamp 50 is part of the current sensor 100, there is no further coupling or attachment required between the voltage clamp 50 and current sensor 100.
  • the current sensor 100 is lightweight and can be connected at any point along the length of the conductor 80. The current sensor 100 does not require precise positioning in relation to other current sensors 100 installed on other conductors 80 of the transformer 150.
  • the conductors 80 further extend from the secondary output 72 of the current sensor 100 and supply power to residences and commercial buildings 120.
  • the output of the current sensor 100 provides power to electronic metering devices 140 through meter cables 125 that run from the secondary cables 72 of the current sensor 100 to the electronic metering devices 140.
  • the split-core design of the current sensor 100 provides a one amp output to the electronic metering devices 140.
  • the one amp output of the current sensor 100 is fed directly to the electronic metering devices, precluding the usage of buffering or amplification equipment,
  • the electronic metering devices 140 may be mounted to the utility pole 110, below the current sensor 100 and pole-mounted transformer 150.
  • the electronic metering devices 140 are capable of processing and then communicating the current and voltage values received from the current sensor 100 having an integral voltage clamp 50.
  • the electronics includes a processor, memory and a communication port. The electronics are operable to communicate current and voltage measurement signals through the communication port over a communication link to another location, which may be nearby, such as the base of the utility pole 110 to which the current sensor 100 and the electronic metering devices 140 are mounted. Alternately and/or additionally, the current signal values may be transmitted to a remotely located control center.
  • the communication link may be a physical hardwired link, a satellite link, a cellular link, a modem or telephone line link, an Internet link, a wide area or local area network link, a wireless link and combinations of the foregoing.
  • the communication link is a wireless link for communicating to a nearby location.
  • the communication port includes a radio transceiver connected to an antenna mounted to the exterior of the electronic metering devices 140.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

La présente invention concerne un capteur de courant servant à mesurer les propriétés de l'électricité circulant dans un conducteur, le capteur comportant un premier segment d'âme, un second segment d'âme, un bobinage secondaire monté sur le second segment d'âme, et une pince de tension conçue pour en percer l'isolation, et de ce fait permettre une connexion électrique avec un conducteur d'un transformateur surveillé par le capteur de courant. Le premier segment d'âme et le second segment d'âme sont attenants de façon à former une âme du capteur de courant. Le capteur de courant est conçu pour alimenter directement des dispositifs de mesure électroniques en aval.
PCT/US2013/039528 2012-05-04 2013-05-03 Capteur de courant comportant une pince de tension intégrée WO2013166428A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261642483P 2012-05-04 2012-05-04
US61/642,483 2012-05-04

Publications (1)

Publication Number Publication Date
WO2013166428A1 true WO2013166428A1 (fr) 2013-11-07

Family

ID=48521405

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2013/039528 WO2013166428A1 (fr) 2012-05-04 2013-05-03 Capteur de courant comportant une pince de tension intégrée

Country Status (1)

Country Link
WO (1) WO2013166428A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015197911A1 (fr) * 2014-06-27 2015-12-30 Efore Oyj Compteur d'énergie électrique et son procédé d'installation
CN105572440A (zh) * 2015-10-20 2016-05-11 浙江华采科技有限公司 一种可安装在电缆上的电能计量装置
US20160131504A1 (en) * 2014-11-07 2016-05-12 GRID20/20, In. Power Monitoring Systems and Methods
CN106531425A (zh) * 2016-11-04 2017-03-22 深圳合纵能源技术有限公司 一种穿刺式取电压的集成电流互感器
CN106680569A (zh) * 2016-12-09 2017-05-17 国网北京市电力公司 电流传感器
WO2017207838A1 (fr) * 2016-05-31 2017-12-07 Smilics Technologies, S.L. Transformateur de courant triphasé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5426360A (en) * 1994-02-17 1995-06-20 Niagara Mohawk Power Corporation Secondary electrical power line parameter monitoring apparatus and system
US5473244A (en) * 1992-09-17 1995-12-05 Libove; Joel M. Apparatus for measuring voltages and currents using non-contacting sensors
US20060284647A1 (en) * 2005-01-19 2006-12-21 Gunn Colin N Sensor apparatus
US20080284410A1 (en) * 2007-05-16 2008-11-20 Square D Company Clamp-on current and voltage module for a power monitoring system
US20090115403A1 (en) * 2007-09-10 2009-05-07 James Bernklau Split core status indicator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5473244A (en) * 1992-09-17 1995-12-05 Libove; Joel M. Apparatus for measuring voltages and currents using non-contacting sensors
US5426360A (en) * 1994-02-17 1995-06-20 Niagara Mohawk Power Corporation Secondary electrical power line parameter monitoring apparatus and system
US20060284647A1 (en) * 2005-01-19 2006-12-21 Gunn Colin N Sensor apparatus
US20080284410A1 (en) * 2007-05-16 2008-11-20 Square D Company Clamp-on current and voltage module for a power monitoring system
US20090115403A1 (en) * 2007-09-10 2009-05-07 James Bernklau Split core status indicator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015197911A1 (fr) * 2014-06-27 2015-12-30 Efore Oyj Compteur d'énergie électrique et son procédé d'installation
EP2960659A1 (fr) * 2014-06-27 2015-12-30 Efore OYJ Compteur d'énergie électrique et procédé d'installation de celui-ci
US20160131504A1 (en) * 2014-11-07 2016-05-12 GRID20/20, In. Power Monitoring Systems and Methods
US10408865B2 (en) * 2014-11-07 2019-09-10 GRID20/20, Inc. Power monitor protective shroud
CN105572440A (zh) * 2015-10-20 2016-05-11 浙江华采科技有限公司 一种可安装在电缆上的电能计量装置
WO2017207838A1 (fr) * 2016-05-31 2017-12-07 Smilics Technologies, S.L. Transformateur de courant triphasé
CN106531425A (zh) * 2016-11-04 2017-03-22 深圳合纵能源技术有限公司 一种穿刺式取电压的集成电流互感器
CN106680569A (zh) * 2016-12-09 2017-05-17 国网北京市电力公司 电流传感器

Similar Documents

Publication Publication Date Title
WO2013166428A1 (fr) Capteur de courant comportant une pince de tension intégrée
US9271563B2 (en) Portable self powered line mountable electric power line current monitoring transmitting and receiving system
US20230003812A1 (en) Overhead power line sensor
US8760254B2 (en) Apparatus and method for mounting an overhead monitoring device
US8594956B2 (en) Power line energy harvesting power supply
CA2858407C (fr) Capteur de courant de fuite pour isolateur suspendu
CA2873500C (fr) Appareil et procede de mesure des courants de fuite sur des chaines de disques d'isolateurs en verre et en porcelaine
US20100013457A1 (en) Power Line Takeoff Clamp Assembly
CN103426620B (zh) 开合式电子式电流互感器
CN104133103A (zh) 架空线负荷电流监测装置
US20070109088A1 (en) Snap-On Parasitic Power Line Transformer
KR100934247B1 (ko) 무선 열감응 센서 모듈을 구비한 주상 변압기
KR20210033660A (ko) 부스바 성능감시장치
CN107946126B (zh) 具有测温功能的剪刀式隔离开关静触头
CN204614659U (zh) 一种抗干扰的高灵敏度零序电流互感器
US10984940B2 (en) Compression housing for a laminate core of an inductive current transformer
CN211045255U (zh) 一种大容量高精度的零序电流互感器
CN216387192U (zh) 一种数据中心用低压交流电流采集模块
CN214429304U (zh) 一种高压配电线路防水取电装置
CN107833736B (zh) 一种组合式高压电流互感器
CN215834390U (zh) 一种铁芯夹件电流传感器
CN219736432U (zh) 一种无源无线温湿度传感器
CN203178317U (zh) 开关柜试验用金属抽带式夹子
CN212587444U (zh) 一种带有电气量检测接口的跌落式熔断开关
CN208889459U (zh) 一种用于户外安装的电压互感器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13725236

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13725236

Country of ref document: EP

Kind code of ref document: A1