EP1321951A1 - Appareil de mesure compact pour la protection d'une ligne à moyenne tension - Google Patents

Appareil de mesure compact pour la protection d'une ligne à moyenne tension Download PDF

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Publication number
EP1321951A1
EP1321951A1 EP02080450A EP02080450A EP1321951A1 EP 1321951 A1 EP1321951 A1 EP 1321951A1 EP 02080450 A EP02080450 A EP 02080450A EP 02080450 A EP02080450 A EP 02080450A EP 1321951 A1 EP1321951 A1 EP 1321951A1
Authority
EP
European Patent Office
Prior art keywords
protection
measurement apparatus
current
medium
compact measurement
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.)
Withdrawn
Application number
EP02080450A
Other languages
German (de)
English (en)
Inventor
Alberto Vaghini
Walter Veneziani
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.)
Vei Power Distribution SpA
Original Assignee
Vei Power Distribution SpA
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 Vei Power Distribution SpA filed Critical Vei Power Distribution SpA
Publication of EP1321951A1 publication Critical patent/EP1321951A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01F38/38—Instruments transformers for polyphase ac
    • 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
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/027—Integrated apparatus for measuring current or voltage

Definitions

  • the present invention refers to a compact apparatus for picking up current in a medium-voltage line suitable for being connected to a protection relay, which drives a medium-voltage automatic switch.
  • Medium-voltage automatic tri-polar switches with a nominal voltage of up to 24 kV, are used in all applications of the secondary distribution of medium voltage and in medium-voltage/low-voltage transformation substations in buildings, offices in the industrial sector in general and in tertiary industry.
  • sulphur hexafluoride (SF 6 ) switches are particularly suitable for service in primary and secondary distribution stations, where there is the need to carry out fast shut down cycles in overhead and cable distribution lines, for manoeuvring industrial power factor correction units with heavy-duty operation and limited maintenance, for the command of motors and, in general, for high reliability and long lifetime applications.
  • SF 6 sulphur hexafluoride
  • the interruption of the arc is normally realised through self-pneumatic blow out of SF 6 gas combined with the contribution of self-generation and, therefore, with limited absorption of mechanical energy.
  • the system operates normally sealed under pressure and is suitable for repeated fast shut downs, operating with limited overvoltages also in the manoeuvre of small inductive and capacity voltages.
  • the poles, placed in cylinders of casting resins with gas sealing systems, and the support and command structures of the tri-polar switch can realise fixed or removable front and/or side operations.
  • the aforementioned automatic switches are equipped with current sensors and/or circuit-breakers or electronic maximum current relays, powered by themselves, which allow use in unmanned mediumvoltage/low-voltage transformation substations without auxiliary power supply.
  • the two or three transformers applied to the switch supply the energy necessary for the operation of the relay and for the switching off of the switch through a demagnetisation actuator group applied to the command, which allows overloads (at long reverse time and at adjustable fixed time) and short-circuits (at adjustable independent time) to be detected.
  • the maximum power circuit-breakers can be realised with a microprocessor and are suitable for taking care of the function of protection against overload and against instantaneous and delayed short-circuit, as well as the function of protection against grounding failure.
  • the purpose of the present invention is therefore that of avoiding the aforementioned drawbacks and, in particular, that of realising a compact measurement apparatus for the protection of medium-voltage lines with medium-voltage automatic switches, which allows extreme reliability in general to be obtained, capable of being used without substantial interventions or complex treatments on board the switchboard, at the same time keeping the possibility of effectively measuring the data relative to the problems of protection of the electrical lines.
  • Another purpose of the present invention is that of realising a compact measurement apparatus for the protection of medium-voltage lines, which allows the carrying out of a measurement of the functions or malfunctions of the current circulating in the medium-voltage lines, of a reading and detection of the grounding currents, of a pinpointing of short-circuits and of possible unbalances between the phases, without using particularly expensive components and without foreseeing particular or extremely specific insulation devices.
  • a further purpose of the present invention is that of indicating a compact measurement apparatus for the protection of medium-voltage lines which is highly precise, stable, effective and safe.
  • the last but not least purpose of the invention is that of realising a compact measurement apparatus for the protection of medium-voltage lines at a low cost and without using complex or expensive technologies.
  • the protection apparatus includes within a single epoxy resin block, once enclosed in a container made from thermoplastic material, a combined series of toroidal windings, having a sufficiently long core to obtain good electrical performance, and a further winding, suitable for collecting the phase current, separated from the other windings by the resin insulation.
  • the apparatus allows a series of samples of electric current to be taken, in order to obtain both homopolar and directional protection, thus allowing the function of protection against overload, against instantaneous and delayed short-circuit and against grounding failure to be taken care of.
  • a conventional embodiment of a medium-voltage automatic tri-polar switch is generically indicated with 10, in which each apparatus for the protection of medium-voltage lines (in particular, a transformer), which is generically indicated with 15, is applied directly to each pole 13 of the switch 10.
  • a transformer which is generically indicated with 15
  • the switch 10 comprises a switchboard 11 fixed to a support base 12 for the poles 13, each of which essentially consists of an insulating cylinder 17, made from casting resin with gas sealing systems, whereas the protection apparatus 15 in general takes care of the function of protection against current overload, instantaneous and delayed short-circuit and grounding failure.
  • Figures 2, 3 and 4 respectively, refer to an embodiment of the compact measurement apparatus for the protection of medium-voltage lines, according to the present invention (generically indicated with 16 in the figures), and to an example of application of such an apparatus 16 in a compartment with a bar switch and disconnecting switch.
  • the apparatus 16 object of the invention foresees the use of three toroidal transformers 40, 44, 47, one for each phase, which are installed above an attachment support 46 and inside an insulating casing 20, as illustrated in detail in figures 2 and 3.
  • the toroidal transformers 40, 44, 47 are combined together and have a core with a substantially largediameter. Moreover, according to the invention, it is foreseen to couple a homopolar transformer, schematically indicated with 39, for the collection of the three phases.
  • the homopolar transformer 39 is separated from the other three toroidal transformers 40, 44, 47 by means of a resin insulation and allows the grounding failure current to be detected through the execution of a vector sum of the phase currents.
  • the compact protection apparatus 16 can be applied with undoubted advantages in a compartment 21 inside of which is housed a bar switch and disconnecting switch, of the tripolar type, according to a preferred but not limiting embodiment of the present invention, generically indicated with 22 in figure 4.
  • the cables 23 of the medium-voltage line which are arranged inside an underground passage 24, arrive near to the compartment 21 and pass inside the toroidal transformers 40, 44, 47 of the apparatus 16, which is fixed, inside the compartment 21, to the front of the switch 22.
  • One of the medium-voltage cables is used as a cable intended for general use and for input for the general power supply of the switchboard 27 attached to the compartment 21 of the bar switch and disconnecting switch 22.
  • each cable 23, after having crossed the respective toroid, is connected directly to the switch 22, through a specific lower connector 25, whereas a series of signals in output from the toroidal transformers 40, 44, 47 (proportional to the current circulating in the phases) are conducted directly to a protection relay 26 for the switchboard 27.
  • the three connectors 36, 37, 38, through the respective outputs 41, 42, 43 of the apparatus 16 send the respective phase signals of the toroidal transformers 40, 44, 47 to the protection relay 26 in order to detect the current of the separate phases.
  • the connector 45 by means of the output 44A, sends a homopolar output signal, taken directly from the homopolar transformer 39, to the protection relay 26 so as to allow the detection of grounding failures.
  • the self-powered relay 26 realised in microprocessor digital technology, is placed to protect the maximum current values (biphase or triphase) and operates the opening or switching off of the switch 22 directly on the relative command, in the case of intervention of the protection functions.
  • the correct operation of the entire switching off unit of the switch 22 is guaranteed in the presence of a current greater than or equal to 20% of the nominal value on at least one of the phases.
  • the protection apparatus 16 is contained entirely inside a single container casing 20 made from thermoplastic material, which rests upon the attachment surface 46, whereas, inside the casing 20, an epoxy resin suitable for the necessary insulation is used.
  • the apparatus according to the invention is suitable for detecting current signals to realise overload protection at long reverse time and at adjustable fixed time, short-circuit protection at adjustable independent time and, in general, all maximum phase current protection (instantaneous, with adjustable delay as well as with dependent and fixed time), as well as, possibly, maximum grounding failure current protection (with adjustable delay), calculated as a vector sum of the three primary phase currents and realised by means of the homopolar toroid 39, which processes the phase currents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Accessories (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP02080450A 2001-12-21 2002-12-17 Appareil de mesure compact pour la protection d'une ligne à moyenne tension Withdrawn EP1321951A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001MI002788A ITMI20012788A1 (it) 2001-12-21 2001-12-21 Apparecchiatura compatta di misura per la protezione delle linee di media tensione
ITMI20012788 2001-12-21

Publications (1)

Publication Number Publication Date
EP1321951A1 true EP1321951A1 (fr) 2003-06-25

Family

ID=11448751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02080450A Withdrawn EP1321951A1 (fr) 2001-12-21 2002-12-17 Appareil de mesure compact pour la protection d'une ligne à moyenne tension

Country Status (2)

Country Link
EP (1) EP1321951A1 (fr)
IT (1) ITMI20012788A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007029775A1 (de) * 2007-06-25 2009-01-08 Siemens Ag Messwandleranordnung mit mehreren Sekundärkreisen
WO2009010493A1 (fr) * 2007-07-17 2009-01-22 Siemens Aktiengesellschaft Dispositif transformateur d'un appareillage sous enveloppe métallique à isolation gazeuse et appareillage sous enveloppe métallique à isolation gazeuse
CN103219170A (zh) * 2013-03-26 2013-07-24 中国科学院等离子体物理研究所 中性束注入高压电源输出机械保护开关
CN107146701A (zh) * 2017-06-28 2017-09-08 国网山东省电力公司烟台供电公司 一种互感器及接线装置
CN111579949A (zh) * 2020-05-28 2020-08-25 海南驿电通科技有限公司 一种电缆绝缘检测装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024434A (en) * 1957-09-13 1962-03-06 Gen Electric Electromagnetic induction apparatus
US3512045A (en) * 1968-06-28 1970-05-12 Gen Signal Corp Ground fault responsive apparatus for electric power distribution apparatus
DE19830017A1 (de) * 1998-06-26 1999-12-30 Siemens Ag Mehrpoliger strombegrenzender Leistungsschalter
DE19828890A1 (de) * 1998-06-23 2000-02-03 Aeg Kondensatoren Und Wandler Stromwandler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024434A (en) * 1957-09-13 1962-03-06 Gen Electric Electromagnetic induction apparatus
US3512045A (en) * 1968-06-28 1970-05-12 Gen Signal Corp Ground fault responsive apparatus for electric power distribution apparatus
DE19828890A1 (de) * 1998-06-23 2000-02-03 Aeg Kondensatoren Und Wandler Stromwandler
DE19830017A1 (de) * 1998-06-26 1999-12-30 Siemens Ag Mehrpoliger strombegrenzender Leistungsschalter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007029775A1 (de) * 2007-06-25 2009-01-08 Siemens Ag Messwandleranordnung mit mehreren Sekundärkreisen
DE102007029775B4 (de) 2007-06-25 2023-02-16 Siemens Energy Global GmbH & Co. KG Messwandleranordnung mit mehreren Sekundärkreisen
WO2009010493A1 (fr) * 2007-07-17 2009-01-22 Siemens Aktiengesellschaft Dispositif transformateur d'un appareillage sous enveloppe métallique à isolation gazeuse et appareillage sous enveloppe métallique à isolation gazeuse
CN103219170A (zh) * 2013-03-26 2013-07-24 中国科学院等离子体物理研究所 中性束注入高压电源输出机械保护开关
CN107146701A (zh) * 2017-06-28 2017-09-08 国网山东省电力公司烟台供电公司 一种互感器及接线装置
CN111579949A (zh) * 2020-05-28 2020-08-25 海南驿电通科技有限公司 一种电缆绝缘检测装置
CN111579949B (zh) * 2020-05-28 2023-06-23 创新电力技术(海南)有限公司 一种电缆绝缘检测装置

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Publication number Publication date
ITMI20012788A1 (it) 2003-06-21

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