EP3151255B1 - Current transformer with additional voltage indication for the use in medium or high voltage equipment - Google Patents

Current transformer with additional voltage indication for the use in medium or high voltage equipment Download PDF

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Publication number
EP3151255B1
EP3151255B1 EP15188241.2A EP15188241A EP3151255B1 EP 3151255 B1 EP3151255 B1 EP 3151255B1 EP 15188241 A EP15188241 A EP 15188241A EP 3151255 B1 EP3151255 B1 EP 3151255B1
Authority
EP
European Patent Office
Prior art keywords
voltage
current transformer
capacitor
primary
conductor
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP15188241.2A
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German (de)
English (en)
French (fr)
Other versions
EP3151255A1 (en
Inventor
Pavel Vano
Black-YongLiang LIANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz 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 Schweiz AG filed Critical ABB Schweiz AG
Priority to EP15188241.2A priority Critical patent/EP3151255B1/en
Priority to CN201610847741.2A priority patent/CN106560903B/zh
Publication of EP3151255A1 publication Critical patent/EP3151255A1/en
Application granted granted Critical
Publication of EP3151255B1 publication Critical patent/EP3151255B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means

Definitions

  • the invention relates to a current transformer with additional voltage indication for the use in medium or high voltage equipment, with primary terminals and primary conductors and a current transformer core.
  • JPS57167612A describes that a purpose is to avoid over concentration of electric field on a current conductor drawn out of the lead out part of a stationary induction apparatus even if the sectional area of the current conductor is large enough only to bear the load current by winding shielded wire around the conductor.
  • a lead out part of the end of a high voltage coil is composed of a conductor with insulation covering and a shielded wire wound around the conductor using the conductor as an axis.
  • the potential of the shielded wire is determined by connecting at least one end of the shielded wire to the high voltage part or by the composition by which the specific voltage is controlled by capacitor potential dividing.
  • US3500197A describes that a first corona shield is disposed on and insulated from the core of the high voltage transformer, thereby to form a first capacitance with another corona shield arranged around the secondary winding and to form a second capacitance with the transformer core, these capacitances being connected in series to define a capacitive voltage divider, an external meter being connected across said second capacitor so as to measure a predetermined portion of the transformer output voltage.
  • US2011/043999A1 describes that a unitary-enclosure housing apparatus and arrangement for protecting and cooling the high voltage electronic conditioning and filtering circuitry components used for providing a high-voltage waveform to an electrostatic precipitator device includes a hermetically sealed dielectric liquid coolant filled tank/housing having one or more side-mounted hollow-panel type radiator structures for dissipating heat from the coolant. It is described that the disclosed unitary-enclosure housing apparatus and the particular arrangement of the internal electronic components results in a relatively external small footprint while containing both the transformer-rectifier set and high-voltage resistor-capacitor filter components associated with a high-voltage electrostatic precipitator device in a single unitary package.
  • EP2136216A describes a combined measurement device for measuring current and/or voltage of an electrical conductor, comprising a supporting body, a current sensor housed inside the supporting body, and a voltage sensor located at least partially inside the supporting body.
  • a shielding is positioned around the current sensor.
  • the current sensor and the voltage sensor are mutually arranged so as the shielding shields at least partially both the current sensor and the voltage sensor against external electric field disturbances.
  • a high amount of variant are causing complexity in manufacture as well as purchasing many different but similar shapes.
  • the object of the invention is, to reduce the number of needed parts, and to support standardization, in the manufacture of the current transformer.
  • a current transformer with voltage indication for use in medium or high voltage equipment as defined in present claim 1.
  • the basic feature combination is, that beside the current transformer an output conductor is arranged in such, that the output conductor is electrically connected to a part of voltage divider used for voltage indication or voltage measurement, which consists of at least one discrete capacitor located within the current transformer body arranged in such, that it provides the primary capacitance from the primary conductor, needed for voltage indication systems.
  • Secondary capacitance of the voltage divider is either fully or at least partly located outside the current transformer body.
  • capacitors are, used.
  • the capacitors are connected in series.
  • a second capacitor is connected between the primary capacitor and the ground, in order to adjust the secondary capacitance value, thus adjusting the voltage ratio of voltage divider.
  • the output wire is shielded in order to reduce influence of stray capacitances or transformer design on the output of voltage divider and thus affects performance or parameters of voltage indicator.
  • the conductive connection between the primary conductor and the primary capacitor is provided with a thermal dilatation compensation element.
  • the thermal dilatation compensation element is formed as a spiral or a cylindrical spring form.
  • the current transformer as well as the voltage indicator are mounted on a support element, which is provided with a grounding terminal.
  • the current transformer as well as the voltage indicator as well as the support element, as well as the grounding terminal, as well as further connecting terminal are moulded in a common housing.
  • the current transformer voltage indication is reduced in the number of variants. Dependencies on geometry of primary conductor and grounded parts are eliminated.
  • Figure 1 displays a perspective view on a current transformer 1.
  • Primary terminals 2 are connected to primary conductor 2' which is passing through at least one secondary circuit 3'.
  • the secondary circuit 3' is connected to secondary terminals 3.
  • the shielded output cable 4 is arranged close beside the secondary circuits 3' and/or close beside the wires connecting the secondary circuits with the secondary terminals 3, in such, that the shielding cable 4 is electrically connected to a voltage divider 5 as voltage indicator which consists of a first primary capacitance C1, and a secondary capacitance C2, which are serially arranged in such, that a first capacitor C1 creates the capacitance between the primary conductor 2 and the shielding cable 4, and the secondary capacitor C2, if used, creates the capacitance between the shielded cable 4 and the ground potential 6.
  • the voltage indicator 5 embellished as voltage divider consist of two capacitances C1 and C2 in line, that means connected in series.
  • the upper end of the voltage divider 5 is electrically connected via a HV connection 8 to the primary conductor, and at the bottom side to ground terminal 6.
  • the voltage divider is connected to its middle point between the capacitances C1 and C2 with the output wire 4.
  • Output wire 4 can be also shielded in order to reduce influence of stray capacitances or current transformer design on the performance or parameters of voltage indicator.
  • Ground terminal (6) can be located either close to the secondary capacitor (C2) or close to the secondary terminals (3).
  • the aforesaid upper-end connection of the voltage divider 5 to the primary conductor 2' (windings) is realized by a conductive element which can be structured as a dilatation compensating element 7.
  • the dilatation compensating element 7 is formed in a spiral or cylindrical spiral spring form.
  • the lower-end of the voltage divider is connected electrically to ground terminal 6.
  • FIG. 2 displays another possible application or housing of the new voltage divider structure described above.
  • This application/product provides voltage indication functionality and does not contain any current transformer, thus no secondary circuits of current transformer.
  • Figure 3 displays the electrical scheme of voltage divider 5 considering the use of shielded output wire and secondary capacitor (C2).
  • the construction of voltage indication functionality consists of output wire (4) and primary capacitor (C1) only.
  • secondary capacitor (C2) is used to define secondary capacitance more precisely, and/or the shielding (4') of the output wire is used to avoid interferences from surrounded parts of current transformer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP15188241.2A 2015-10-02 2015-10-02 Current transformer with additional voltage indication for the use in medium or high voltage equipment Active EP3151255B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15188241.2A EP3151255B1 (en) 2015-10-02 2015-10-02 Current transformer with additional voltage indication for the use in medium or high voltage equipment
CN201610847741.2A CN106560903B (zh) 2015-10-02 2016-09-23 在中或高压设备中使用的具有附加电压指示的电流互感器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15188241.2A EP3151255B1 (en) 2015-10-02 2015-10-02 Current transformer with additional voltage indication for the use in medium or high voltage equipment

Publications (2)

Publication Number Publication Date
EP3151255A1 EP3151255A1 (en) 2017-04-05
EP3151255B1 true EP3151255B1 (en) 2024-06-05

Family

ID=54260655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15188241.2A Active EP3151255B1 (en) 2015-10-02 2015-10-02 Current transformer with additional voltage indication for the use in medium or high voltage equipment

Country Status (2)

Country Link
EP (1) EP3151255B1 (zh)
CN (1) CN106560903B (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107749341A (zh) * 2017-10-18 2018-03-02 湖北大二互科技股份有限公司 一种可以提供带电显示信号的电流互感器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2136216A1 (en) * 2008-06-19 2009-12-23 ABB Technology AG A combined electrical measurement device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2969460A (en) * 1957-10-14 1961-01-24 Collins Radio Co Adjustable high-frequency tuning unit
US3500197A (en) * 1968-04-29 1970-03-10 Del Electronics Integrated high voltage transformer and capacitor divider
JPS57167612A (en) * 1981-04-08 1982-10-15 Mitsubishi Electric Corp Winding composition of stationary induction apparatus
DE4123812C2 (de) * 1991-07-18 1993-10-28 Bosch Gmbh Robert Transformator
US6737648B2 (en) * 2000-11-22 2004-05-18 Carnegie Mellon University Micromachined infrared sensitive pixel and infrared imager including same
US8000102B2 (en) * 2009-08-20 2011-08-16 Babcock & Wilcox Power Generation Group, Inc. Apparatus and arrangement for housing voltage conditioning and filtering circuitry components for an electrostatic precipitator
EP2693223B8 (en) * 2012-08-03 2021-09-08 ABB Schweiz AG Voltage measurement device with an insulating body
EP2703208A1 (en) * 2012-09-04 2014-03-05 ABB Technology AG Controlling a modular converter
CN102983001B (zh) * 2012-11-30 2015-05-13 苏州福瑞互感器有限公司 一种自适应温度补偿电容器
CN203950688U (zh) * 2014-07-01 2014-11-19 浙江大荣电气有限公司 一种新型高压电力电容器

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2136216A1 (en) * 2008-06-19 2009-12-23 ABB Technology AG A combined electrical measurement device

Also Published As

Publication number Publication date
CN106560903A (zh) 2017-04-12
CN106560903B (zh) 2019-07-19
EP3151255A1 (en) 2017-04-05

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