EP0347304B1 - Transformateur électrique de mesure - Google Patents

Transformateur électrique de mesure Download PDF

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Publication number
EP0347304B1
EP0347304B1 EP89401633A EP89401633A EP0347304B1 EP 0347304 B1 EP0347304 B1 EP 0347304B1 EP 89401633 A EP89401633 A EP 89401633A EP 89401633 A EP89401633 A EP 89401633A EP 0347304 B1 EP0347304 B1 EP 0347304B1
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EP
European Patent Office
Prior art keywords
transformer
configuration
measuring
transformer according
adapting
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.)
Expired - Lifetime
Application number
EP89401633A
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German (de)
English (en)
French (fr)
Other versions
EP0347304A1 (fr
Inventor
Jean Paul Avocat
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT89401633T priority Critical patent/ATE95943T1/de
Publication of EP0347304A1 publication Critical patent/EP0347304A1/fr
Application granted granted Critical
Publication of EP0347304B1 publication Critical patent/EP0347304B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to an electrical measuring transformer. More specifically, the present invention applies to transformers, single-phase or multi-phase, capable of adapting an actual electrical value to a value compatible with a measurement, counting, control or monitoring module.
  • the invention will find its application in the field of electrical construction of such transformers and in particular in the industry of manufacturing current transformers.
  • Such transformers are used to supply measurement, metering, control or monitoring modules. These modules are generally designed to work with a reduced current and therefore require the use of measuring transformers when the currents to be controlled have values greater than the nominal value of said modules which, generally, are located at five amps.
  • the transformers are made so that the current reduced at the secondary is exactly proportional to the primary current, that is to say that it is its total image. . This is particularly important when the metering module is used to bill the energy consumed by a subscriber on the national distribution network.
  • the transformer when the transformer is made for a module of the electromechanical type, it is common for the power absorbed to be of the order of 15 VA. In this case, the transformation ratio error curve is within the fixed limits. On the other hand, if this same transformer is used on a metering or other electronic module, the absorbed power will be much lower and of the order of 3 VA and the error curve will be outside the allowed limits, which will distort the measurement.
  • the consumption of subscribers differs from one to the other and one can envisage networks of use consuming 50 amperes while others in consume 2000.
  • the purpose of the current transformer is to adapt the current consumed to the nominal value of the meter, which makes it possible to provide only one type of meter.
  • the variation in resistance of the secondary winding due to the temperature is compensated for by providing a resistance shunting part of the secondary winding.
  • document US-A-3617967 discloses a transformer having different primary switchable windings. According to this document, the switching is carried out winding by winding, by means of small bars, mounted one by one, without voltage, that is to say without operation, in order to carry out series, parallel or series-parallel couplings. of these primary winding portions.
  • the aim of the present invention is to propose an electrical measurement transformer, single-phase or polyphase, capable of adapting an actual electrical value to a value compatible with a measurement, counting, control or monitoring module, which makes it possible to overcome the disadvantages mentioned above while avoiding any risk of human error.
  • One of the aims of the present invention is to propose an electrical measuring transformer, the configuration of which is adapted as a function of the range of use chosen, that is to say which, when its characteristics have been determined with respect to in use, easily adaptable to this use, preventing the risk of incorrect wiring.
  • Another object of the present invention is to provide an electrical measurement transformer which has at least two ratings, that is to say two ranges of use, thus allowing evolution over time without having to change the installation. to transform it if there is evolution.
  • the measurement transformer of the present invention has two consecutive transformation ratios, in particular 10, 20 or 20, 40, etc., which, when it is used for the first time, is configured on the first ratio and whose structure is designed to adapt the configuration of the transformer according to the range of use chosen, in particular by switching the windings according to the range chosen.
  • Another object of the present invention is to present a measurement transformer whose control of the configuration of the transformer as a function of the chosen range is possible in order to avoid any anomaly.
  • the present invention provides an electrical measuring transformer having means for controlling the configuration of the transformer, means which may be, in a simplified version, only visual and which, in a more elaborate version, may react automatically by signaling the unsuitability.
  • Another object of the present invention is to provide a measurement transformer which can easily be adapted as a function of the power required for the measurement, counting, control or monitoring module, and in particular which can allow consumption of 3 VA or 15 VA , depending on whether one works respectively in electronic module or in electromechanical module.
  • Another object of the present invention is to provide an polyphase electrical measuring transformer which, during its installation, allows, by a single operation, to adapt the configuration of the transformer according to the range of use chosen without wiring error, d '' adapt the configuration of the transformer according to the use of the measurement and / or control the configuration of the transformer according to the range chosen and / or the use of the measurement.
  • the electric transformer for measuring current (1), single-phase or multi-phase capable of adapting an actual electrical value (i1) to a value compatible (12) with a module (7) for measuring, metering, control or monitoring, in particular said transformer (1) having a primary side (2) and a secondary side (3), defining a transformation ratio (i1 / i2) and consequently its range of use, as well as means (6) for adapting the secondary configuration of the transformer as a function of the range of use chosen, said secondary side (3) having at least one switchable winding (5) comprising a plurality of secondary connection terminals S2, S3 (11 , 12) defining a plurality of respective single transformation ratios, a first output terminal connected to the secondary winding S1, a second free output terminal S0, is characterized in that the means (6) for adapting the secondary configuration of the transformer are constituted by a set of devices (13) for selecting a single current ratio, each device (13) allowing the selection of one of said plurality of ratios single transformation and being provided to be de
  • the transformer comprises at each selection device an auxiliary circuit capable of delivering output information dependent on the single transformation ratio chosen in order to control the configuration of the transformer selected.
  • the transformer comprises means for adapting the configuration of the transformer as a function of the use of the measurement, namely as a function of the power necessary for the measurement, counting, control module. or monitoring, in order to correct the image value of the actual measurement delivered.
  • FIG. 1 schematically illustrates a first embodiment of a single-phase electrical measurement transformer produced according to the present invention.
  • Figure 2 schematically shows a more elaborate variant of a single-phase measurement transformer according to the present invention.
  • FIG. 3 shows a simplified perspective view of the production of a secondary winding of a single-phase current transformer operating according to the principle of FIG. 1.
  • Figure 4 shows a detail of the embodiment of the transformer as for example illustrated in Figure 3, means for adapting the configuration of the transformer.
  • FIG. 5 shows a perspective view of a three-phase current transformer whose winding is provided in accordance with the present invention.
  • FIG. 6 shows a perspective view from below of the means of the present invention for adapting and / or controlling the configuration of the transformer as a function of the range chosen according to one of the embodiments.
  • FIG. 7 illustrates a perspective view from above of the means illustrated in FIG. 6.
  • FIG. 8 shows an alternative embodiment of the means shown in FIG. 4.
  • the invention relates to an electrical measuring transformer, single-phase or multi-phase.
  • a transformer will in particular be provided for adapting an actual electrical value to a value compatible with a measurement, metering, control or monitoring module.
  • a typical application of the present invention will be the production of current transformers intended for metering single-phase or multi-phase energy.
  • other applications could be envisaged for, for example, giving information proportional to the values measured to measuring devices, protection relays or any other monitoring system.
  • this invention was made in the field of electric current measurement transformers, however it could be transposed in other fields and for example in voltage measurement transformers.
  • Voltage measurement generally poses few problems because the measuring devices are easily achievable for voltages up to 1000 volts. On the other hand, as regards the current, this being able to evolve up to, for example, 2000 amperes, electrical transformers for measuring current are generally used. However, the correct choice of the gauge and their correct wiring depend on the quality and accuracy of the measurement.
  • FIG. 1 illustrates a transformer (1), single phase, current, according to the present invention, in a simplified version to understand the essence of the invention.
  • the transformer (1) traditionally comprises a primary circuit (2), as well as a secondary circuit (3) distributed over a magnetic circuit (4).
  • the magnetic circuit In the case of the single-phase current transformer, the magnetic circuit generally has a toroidal shape defining a central space capable of receiving the phase connector which in this case defines the primary (2) and on which the toroid is wound at least one secondary winding ( 5).
  • the current transformer (1) is defined by its nominal value of the secondary current, its ratio of transformation and the limits imposed on its errors within a range of variation of the primary current, that is to say its operating range.
  • the secondary is provided in such a way that it allows two calibers, that is to say two normal ranges of use.
  • the secondary circuit (3) has at least one winding (5) with intermediate tap or even two separate windings.
  • the primary has two connection terminals (E1) and (E2) while the secondary has three connection terminals (S1), (S2) and (S3).
  • the winding is carried out in such a way that the ratio of the primary currents (i1) to the secondary current (i2) defines two transformation ratios.
  • the ratio is 100/5 while on terminal (S3), the ratio is 200/5.
  • the transformer (1) comprises means (6) for adapting the configuration of the transformer (1) according to the range of use chosen, which performs at least the switching of the secondary winding (s) (5) depending on the range chosen.
  • each secondary circuit (3) has at least on each controlled phase at least one winding (5) with intermediate tap or two separate windings.
  • the means (6) for adapting the configuration of the transformer then simultaneously carry out the wiring of the said winding (s) (5) of each secondary phase considered.
  • FIGS. 5, 6, 7 and more particularly FIG. 6 shows the different connections that are made for example in the case of the ratio 100/5 between (S0) and ( S2) of phase I, (S0) and (S2) of phase II, (S0) and (S2) of phase III.
  • Figures 3, 4 or 8 show a first alternative embodiment of a single-phase transformer.
  • FIG. 3 shows a toroidal magnetic core (4) on which is wound a secondary winding (5) with stitching, inside of which the core will be disposed the primary (2), generally constituted by the same conductive wire in which we want the current measurement.
  • the different outputs of the secondary winding (5), marked (S1), (S2), (S3) as well as the use output marked (S0) are connected to electrical contacts marked (8) and (9) for the outputs (S0) and (S1) to use and respectively (10, 11, 12) for the outputs (S0, S2 and S3) to be switched.
  • the means (6) are in the form of a plate or element (13) wiring support, connectable, pluggable or snap-on on the body of the transformer (1) according to the embodiments, the wiring of which is according to the chosen operating range.
  • the contacts (10, 11, 12) are produced by elastic lyres, obtained in particular by cutting from a strip of phosphorous bronze, identified (14), suitable to cooperate with a cylinder or rod (15) made of copper metal alloy.
  • a strip of phosphorous bronze identified (14)
  • a cylinder or rod made of copper metal alloy.
  • Figure 8 shows another embodiment in which, instead of using an elastic lyre trapping the contact rod, two U-shaped contacts are used on which the contact rod is pushed by a spring (24).
  • the transformer of the present invention advantageously further comprises means (16) for controlling the configuration of the transformer as a function of the range chosen, capable of delivering information dependent on the configuration produced.
  • these means (16) consist of a window cut out from each plate (13) constituting the means (6), window revealing an inscription worn on the body of the transformer indicating the chosen ratio.
  • these means for controlling the configuration will deliver materializable output information, in particular electrically. This will be described in more detail, in particular with regard to FIG. 2.
  • FIG. 2 shows an embodiment of a single-phase transformer according to the present invention, which takes up the specific characters which have just been described and shows in particular said means (6) for adapting the configuration of the transformer according to the range of use chosen.
  • the transformer (1) further comprises means (17) for adapting the configuration of the transformer (1) as a function of the use of the measurement, in particular as a function of the power required by the measurement, counting, control or monitoring module in order to correct the "image" value of the actual measurement delivered.
  • This adaptation of the transformer which as specified above makes it possible to carry out a correction of amperes turns to place the error curve of transformation ratio in an authorized range, will be carried out by switching according to the cases at one end of the secondary winding (5) the output (S1) (9) of the use on the output (S′1) or (S ⁇ 1) of the winding (5).
  • a tapping will be carried out at the start of the winding which in position (S ⁇ 1) will allow the error curve to be slightly displaced for electromechanical use of power consumption of about 15 VA.
  • the secondary circuit (3) having at least one winding (5) with intermediate tap or even two separate windings to define the characteristic of the transformer as a function of the measured measured power consumed , the means (17) carry out the internal wiring at the input of the winding, this according to the same principle as described above for the means (13).
  • the present invention also applies to a polyphase and in particular three-phase transformer.
  • the secondary circuit has at least on each secondary phase at least one winding (5) with intermediate tap or even two separate windings to define the characteristic of the transformer as a function of the necessary power consumed, and the means (17) for adapt the configuration of the transformer according to the use simultaneously carry out the internal wiring of the said winding (s) of each secondary phase.
  • the means (6) for adapting the configuration of the transformer as a function of the range of use chosen and the means (17) for adapting the configuration of the transformer as a function of the use of the measurement are carried by the same wiring support plate (13) which makes the connections simultaneously.
  • each of the four plates or elements (13) making it possible to adapt the configuration of the transformer is in the form of an insulating plate on which are arranged a first series of electrical bridges (15) depending on the connections to be made to determine the size, and a second series of electrical bridges (25) depending on the connections to be made for determine the power.
  • said transformer body carries elastic or other contacts connected to the secondary windings capable of cooperating with the electrical bridges of the first and second series.
  • Figures 5 and 6 illustrate such a three-phase transformer for current measurement, allowing the adaptation of the configuration of the transformer according to the range of use and according to the power of use.
  • the transformer includes means allowing this control (16, 22) which are presented as above under the form of windows revealing the inscriptions engraved on the body of the whole.
  • the transformer will include means (23) capable of delivering output information dependent on the configuration produced.
  • these means (23) are in the form of an auxiliary circuit physically and structurally associated with said means (6) and / or (17) for adapting the configuration of the transformer.
  • Such an auxiliary circuit will give, for example, different electrical output information according to the configuration cases, information which can be exploited for example by the use module and can in particular detect an anomaly.
  • auxiliary circuit To structurally produce this auxiliary circuit, different polarizing devices can be used within the reach of those skilled in the art. For example, as illustrated in FIG. 2, from four contacts, the relative connections of these make it possible to have at least four positions. However, other connections could be used and one could also use ohmic resistors of different values according to the cases.
  • the transformer may also be fitted with any other safety device such as sealing, shielding or other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Organic Insulating Materials (AREA)
  • Regulation Of General Use Transformers (AREA)
EP89401633A 1988-06-17 1989-06-13 Transformateur électrique de mesure Expired - Lifetime EP0347304B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401633T ATE95943T1 (de) 1988-06-17 1989-06-13 Elektrischer messtransformator.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808555 1988-06-17
FR8808555A FR2633093B1 (fr) 1988-06-17 1988-06-17 Transformateur electrique de mesure

Publications (2)

Publication Number Publication Date
EP0347304A1 EP0347304A1 (fr) 1989-12-20
EP0347304B1 true EP0347304B1 (fr) 1993-10-13

Family

ID=9367718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401633A Expired - Lifetime EP0347304B1 (fr) 1988-06-17 1989-06-13 Transformateur électrique de mesure

Country Status (11)

Country Link
US (1) US5150039A (no)
EP (1) EP0347304B1 (no)
AT (1) ATE95943T1 (no)
CA (1) CA1308451C (no)
DE (1) DE68909847T2 (no)
DK (1) DK170124B1 (no)
ES (1) ES2046504T3 (no)
FR (1) FR2633093B1 (no)
MA (1) MA21576A1 (no)
NO (1) NO177513C (no)
TN (1) TNSN89064A1 (no)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2664738B1 (fr) * 1990-07-13 1993-11-12 Robert Conroi Transformateur de mesure de courant debrochable a plusieurs rapports de reduction.
US5982257A (en) * 1996-10-31 1999-11-09 Siemens Electromechanical Components, Inc. Integral armature retention spring for electromagnetic relays
US5834932A (en) * 1997-03-17 1998-11-10 May; Gregory R. Watthour meter system
US6040689A (en) * 1997-06-17 2000-03-21 Ssac, Inc. Current sensing method and apparatus
US6198268B1 (en) * 1999-06-30 2001-03-06 General Electric Company Dual-rated current transformer circuit having at least two input circuits
US6865073B2 (en) * 2003-03-06 2005-03-08 General Electric Company Panelboard metering arrangement and method of assembly thereof
FR2894034B1 (fr) * 2005-11-28 2008-01-18 Renault Sas Mesure deportee du courant traversant une charge
DE102011102978B4 (de) 2011-05-23 2018-05-17 Phoenix Contact Gmbh & Co. Kg Strommessumformer
CN103472429A (zh) * 2013-08-28 2013-12-25 国家电网公司 一种多功能多变比比对装置

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US249574A (en) * 1881-11-15 Switch-board for electric circuits
US1641757A (en) * 1924-05-26 1927-09-06 Gen Electric Combined voltmeter and phase-rotation indicator
US1800474A (en) * 1929-10-30 1931-04-14 Western Electromechanical Co I Meter for alternating current
US2384350A (en) * 1942-02-19 1945-09-04 John V Skulley Meter and scale therefor
US2594069A (en) * 1948-02-28 1952-04-22 Mallory & Co Inc P R Battery voltage selector jumper board and terminal board for industrial truck chargers
US2608626A (en) * 1949-05-18 1952-08-26 Donald P Morgan Circuit closing panel
US2891438A (en) * 1950-03-23 1959-06-23 S L F Engineering Company Photoelectric photometer having compensating means for line voltage fluctuations
US3002169A (en) * 1957-03-06 1961-09-26 Gen Dynamics Corp Electrical interconnection device
US3049645A (en) * 1959-06-29 1962-08-14 Skirpan Stephen James Preset lighting control system
US3514694A (en) * 1968-01-09 1970-05-26 Robert W Beachley Means for ground fault detection,metering and control of alternating current electrical systems
US3584299A (en) * 1969-07-11 1971-06-08 Sun Oil Co Hook-on power factor, volt and ampere meter
US3564392A (en) * 1969-09-19 1971-02-16 Gen Electric Magnetic transducer with means for compensating for temperature changes
US3617967A (en) * 1970-04-14 1971-11-02 Electromagnetic Ind Inc Current transformer having primary side switchable to different measuring ranges
US3957333A (en) * 1974-11-01 1976-05-18 Dana Corporation Universal control system interface

Also Published As

Publication number Publication date
DK299589A (da) 1989-12-18
NO892525L (no) 1989-12-18
ES2046504T3 (es) 1994-02-01
DK170124B1 (da) 1995-05-29
NO177513B (no) 1995-06-19
DK299589D0 (da) 1989-06-16
CA1308451C (en) 1992-10-06
FR2633093A1 (fr) 1989-12-22
ATE95943T1 (de) 1993-10-15
US5150039A (en) 1992-09-22
FR2633093B1 (fr) 1992-02-28
NO177513C (no) 1995-09-27
NO892525D0 (no) 1989-06-16
DE68909847T2 (de) 1994-05-05
MA21576A1 (fr) 1989-12-31
TNSN89064A1 (fr) 1991-02-04
DE68909847D1 (de) 1993-11-18
EP0347304A1 (fr) 1989-12-20

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