EP3776780A1 - Procédé et dispositif de détection d'un court-circuit entre spires dans des enroulements disposés en parallèle - Google Patents

Procédé et dispositif de détection d'un court-circuit entre spires dans des enroulements disposés en parallèle

Info

Publication number
EP3776780A1
EP3776780A1 EP18727205.9A EP18727205A EP3776780A1 EP 3776780 A1 EP3776780 A1 EP 3776780A1 EP 18727205 A EP18727205 A EP 18727205A EP 3776780 A1 EP3776780 A1 EP 3776780A1
Authority
EP
European Patent Office
Prior art keywords
current
coils
arrangement
coil
monitoring unit
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.)
Pending
Application number
EP18727205.9A
Other languages
German (de)
English (en)
Inventor
Christoph Armschat
Klaus Pointner
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.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP3776780A1 publication Critical patent/EP3776780A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/44—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the rate of change of electrical quantities
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/72—Testing of electric windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers

Definitions

  • the invention relates to a method for monitoring an electrical arrangement, which has a plurality of coils arranged electrically in a parallel circuit. Farther, the invention relates to such an arrangement.
  • Such electrically arranged in a parallel circuit Spu len can occur, for example, in transformers or electrical's chokes (for example, in an air throttle or in an oil-insulated or gas-insulated throttle).
  • a turn circuit may occur.
  • the thermal energy input in the shorted by the Windungs gleich sene winding is not too large, it is desirable to quickly detect such a Windungs gleich. Then, for example, the arrangement quickly shut down who the. If the input of thermal energy is too high, a fire could otherwise occur.
  • the invention has for its object to provide a method and an arrangement in which a Windungs gleich a single turn can be detected safely and reliably.
  • the process can proceed in such a way that
  • WindungsBankes The occurrence of the Windungs gleiches is detected at the respective Spu le when the change in time of the ratio ses exceeds a predetermined threshold.
  • each Weil the ratio of the current difference and the average value of the current differences is formed for the coils. This ratio changes significantly with the occurrence of a short circuit and can therefore be comparatively easily and reliably monitored.
  • the method can also be such that the coils of the Pa rallelsctiv a (common) monitoring unit is assigned to the signals that describe the flow through the coils describe the currents, or the current differences descriptive bende signals (difference signals) are transmitted and from the the signals are evaluated, whereby the occurrence of the Windungs gleiches is recognized in the respective coil.
  • this monitoring unit advantageously all coils of the parallel circuit can be monitored.
  • the signals describing the coil currents can also be referred to as current signals
  • the signals describing the differences in current can also be referred to as signals representing the current differences.
  • the method can also run so that upon detection of the occurrence of a short circuit in one of the coils of the monitoring unit, a monitoring signal is transmitted to a monitoring receiver over. On the Kochwachungssig signal out then, for example, the electrical arrangement can be switched off.
  • the method can proceed in such a way that the monitoring signal is transmitted from the monitoring unit to the monitoring receiver by means of a wireless signal, in particular by means of a radio signal, and / or by means of an optical waveguide.
  • This type of transmission of the surveillance Signal is advantageously realized an electrical isolation between the monitoring unit and the Matterwachungsempfän ger.
  • the method may also be such that the arrangement has a first terminal and a second terminal, wherein during operation of the arrangement, the second terminal at least temporarily (in particular transient) has a greater electrical potential than the first terminal, and wherein the monitoring unit substantially the electric Po potential of the second terminal is operated.
  • This has the advantage that no electric potential separation between current measuring units (in particular current transformers) and the monitoring unit is required (if the current measuring units are also arranged at this second terminal).
  • An op tional temperature monitoring in the vicinity of the hotspot of the windings which is advantageously arranged in the upper region of Spu le (n) in the vicinity of the hotspot of the winding, then operates in particular on the same electric Po potential, so that the temperature measurement through the same Monitoring unit can be executed.
  • the method can also run so that the monitoring receiver is operated essentially at ground potential.
  • the monitoring receiver which is essentially arranged at ground potential, can be implemented comparatively easily, because no special insulation requirements have to be taken into account here. This is especially true in electrical arrangements, which are arranged at high voltage potential (or means voltage potential).
  • the method can also proceed in such a way that the arrangement has at least 2, in particular at least 3, coils arranged electrically in a parallel circuit.
  • Such Anord calculations with at least two, in particular at least three, electrically arranged in a parallel connection coils occur in particular at air throttles.
  • air throttles can also carry 20 or more coils (layers). point.
  • Such air throttles are often used in power transmission systems, for example, for Blindleis tion compensation or high-voltage direct current
  • the method can proceed in such a way that the arrangement is a coil arrangement, in particular an air coil arrangement.
  • the method it is also conceivable to use the method in oil-insulated coils, in particular in oil-insulated transformers.
  • the method may also be such that the current difference between the current flowing through one of the coils and the average of the currents flowing through the coils is determined by means of a respective current transformer connected in series to the respective coil, the second därwicklitch the current transformers are arranged in a series circuit and the series circuit forms a closed loop. Each coil is therefore associated with its own current transformer. This current transformer is arranged in the current path of the respective coil.
  • the power difference can advantageously be detected by measurement (that is, this current difference need not be calculated by a logic circuit or the like).
  • the monitoring unit can be constructed relatively easily and thus pondere güns tig. This is particularly advantageous in the area of high-voltage technology, where the monitoring unit is at high-voltage potential and therefore large measurement precision requirements are comparatively complicated and cost-intensive.
  • the method can also be such that a resistance (measuring resistor) is connected in parallel to the secondary windings, a signal (voltage signal) being formed by the voltage occurring across the resistor, which signal constitutes the current difference of the associated coil (to the mean value of the coil currents ) describes.
  • This signal can advantageously be supplied to the monitoring unit.
  • the method may also be such that the monitoring unit is supplied with electrical energy which is coupled from at least one of the currents flowing through the coils.
  • the monitoring unit is advantageously enough supplied with electrical energy, which is diverted from the arrangement with the parallel-connected coils.
  • the method can also run so that the monitoring unit is supplied with electrical energy, which is coupled out of at least one of the current transformers.
  • the electrical energy can be decoupled from all current transformers.
  • the entire current flowing through the arrangement is used for the power supply of the monitoring unit.
  • all current transformers are evenly burdened (loaded) and it is the symmetry and thus the measurement result is not affected.
  • the current transformer then advantageously have a dual function: the current transformers are used for measuring and power supply of the monitoring unit (Energy Harvesting).
  • a measuring device for the coils of the parallel circuit in each case determines the current flowing through this coil current (II, 12, 13) or in each case the current difference between the current flowing through this coil and the average value of the currents flowing through the coils, and
  • the signals receives the detected currents (II, 12, 13) or the determined Describe differences in current, and detects on the basis of the currents or differences in current, when one of the coils Win an gleichungsBank occurs.
  • This arrangement can be designed such that
  • the monitoring unit is designed such that it determines an average value of the current differences of the coils
  • WindungsBankes in the respective Spu le detects when the change with time of the ratio exceeds a predetermined threshold ei.
  • the arrangement can also be designed so that when Erken tion of the occurrence of a short circuit in one of the coils, the monitoring unit transmits a monitoring signal to egg nem monitoring receiver.
  • the arrangement can be designed such that the monitoring unit transmits the monitoring signal to the monitoring receiver by means of a wireless signal, in particular by means of a radio signal, and / or by means of an optical waveguide.
  • the arrangement can also be designed such that the arrangement has a first connection and a second connection, wherein during operation of the arrangement the second connection has at least temporarily (in particular transiently) a greater electrical potential than the first connection, and wherein the monitoring unit is arranged substantially on the elec- electric potential of the second terminal.
  • the arrangement can also be designed such that the monitoring receiver is arranged substantially at ground potential.
  • the arrangement may be configured such that the arrangement has at least 2, in particular at least 3, coils arranged electrically in a parallel circuit.
  • the arrangement can also be designed such that the arrangement is a coil arrangement, in particular an air coil arrangement or an arrangement with oil-insulated coils.
  • the arrangement may be configured such that the measuring device for each coil has a current transformer connected in series with the respective coil, the secondary windings of the current transformers being arranged in a series connection and the series connection forming a closed state.
  • the arrangement can also be designed so that parallel to the secondary windings each have a measuring resistor is maral tet, wherein the voltage occurring at the measuring resistor is a signal (voltage signal), which describes the current difference of the associated coil.
  • the arrangement can be designed such that the arrangement has a power supply device which decouples electrical energy for the supply of the monitoring unit from at least one of the currents flowing through the coils.
  • the arrangement can also be designed such that the energy supply device couples the electrical energy for the supply of the monitoring unit from at least one of the current transformers.
  • Figure 1 shows an embodiment of an arrangement with three electrically arranged in a parallel circuit coils and a monitoring unit, and in
  • Figure 2 shows the arrangement with an advantageous embodiment example of a measuring device for determining current differences.
  • FIG. 1 an embodiment of an electrical arrangement 1 is shown.
  • This electrical arrangement 1 has a first electrical coil LI, a second electrical coil L2 and a third electrical coil L3. These three coils LI, L2 and L3 are arranged electrically in a direction Parallelschal.
  • Each of the coils LI, L2 and L3 has a first coil terminal and a second coil terminal respectively.
  • the first coil terminals of the three coils are electrically connected to a first terminal 3 of the arrangement 1 a related party.
  • the second coil terminals of the three coils are electrically verbun with a second terminal 6 of the arrangement 1 to. From the outside, only the first terminal 3 and the second terminal 6 of the arrangement are accessible. Therefore, from the outside, the arrangement 1 acts like a coil with the first terminal 3 and the second terminal 6.
  • the coils LI, L2 and L3 can be configured, for example, as concentric cal hollow-cylindrical coils LI, L2 and L3.
  • the first coil LI can form, for example, a first (inner) position of the arrangement, the second coil L2 a second (middle) position and the third coil L3 a third (outer) position.
  • the layers are then concentric hollow cylin such layers.
  • the arrangement may be hollow cylinder-like, with the axis of rotation of the arrangement aligned vertically can be. As a result of this type of installation of the arrangement, heated air can rise inside the hollow-cylinder-like arrangement, resulting in air cooling.
  • the first terminal 3 may be arranged, for example, on one of the circular surfaces (which is also referred to as a supporting star) of the hollow-cylindrical arrangement and the second terminal 6 on the other circular surface (supporting star) of the arrangement.
  • the first terminal 3 may be arranged at the lower circular area (ie, at the lower edge) of the hollow cylinder-like arrangement, and the second terminal 6 at the upper circular area (ie at the upper edge) of the arrangement.
  • a first current II (first coil current II) flows through the first coil LI.
  • a second current 12 (second coil current 12) flows through the second coil L2, and a third current 13 (third coil current 13) flows through the third coil L3.
  • the sum of the currents II, 12 and 13 forms the total current of the arrangement, which flows via the first terminal 3 and the second terminal 6.
  • Each of the coils is in each case assigned a current branch of the parallel circuit.
  • a first current sensor Ml is arranged.
  • the first Stromsen sor Ml is therefore assigned to the first coil.
  • the first current sensor Ml measures the current II flowing through the first coil LI or a variable derived from this current II.
  • the first current sensor Ml transmits a first signal S1 to a monitoring unit 9.
  • a second current sensor M2 is arranged on the current path of the second coil L2 and on the current path of the third coil L3 a third current sensor M3.
  • the second current sensor M2 sends a second signal S2 to the monitoring unit 9;
  • the third current sensor M3 sends a third signal S3 to the monitoring unit 9.
  • the monitoring unit 9 evaluates the first signal Sl, the second signal S2 and the third signal S3 and recognizes from the signals Sl, S2 and S3, if in one of the coils LI, L2 or L3 a winding short occurs. Upon detection of such an occurrence of a Windungsschlus ses the monitoring unit 9 transmits a monitoring signal 11 to a monitoring receiver 12.
  • the monitoring signal 11 can be transmitted by means of a radio signal 20 and / or by means of an optical waveguide 23 from the Kochwachungssein unit 9 to the monitoring receiver 12.
  • the monitoring signal 11 can be transmitted to the monitoring receiver 12 both by means of the radio signal 20 and by means of the Lichtwellenlei age 23. This advantageously results in a redundant signal transmission.
  • another wireless signal ie, another wireless signal transmission technique may be used.
  • the monitoring receiver 12 is arranged outside the arrangement 1.
  • the monitoring receiver 12 is arranged substantially at ground potential 15.
  • the arrangement 1 can be arranged on egg nem high electrical potential, example, at a high voltage potential greater than 10 kV.
  • the first current sensor Ml, the second current sensor M2 and the third current sensor M3 form a measuring device, which for each of the three coils LI, L2, L3 of the parallel circuit ei nen current difference DIh between flowing through this coil sequent current II, 12 or 13 and a Mean Iav determined.
  • the mean value Iav is the mean value of the currents II, 12 and 13 flowing through the coils LI, L2 and L3.
  • the mean value can also be referred to as the average current Iav flowing through the coils LI, L2 and L3.
  • a particularly advantageous possibility of realizing such a measuring device is shown below in connection with FIG.
  • the signals Sl, S2 and S3 describe the respective current differences DII, DI2 and DI3.
  • the monitoring unit 9 evaluates these differences in current DIh and recognizes from the differences in current DIh when one of the coils LI, L2 or L3 turns off.
  • the measuring device with the three current sensors Ml, M2 and M3 can also determine only the currents flowing through the coils, II, 12 and 13.
  • the signals S1, S2 and S3 then describe the respective currents II, 12 and 13.
  • the monitoring unit 9 determines from the currents 12, 12, 13 the current differences DII, DI2, DI3. By means of evaluation of these differences in current DIh, it is determined when a winding short circuit occurs in one of the coils LI, L2 or L3.
  • the arrangement 1 is a coil arrangement.
  • the arrangement 1 may be an air-core coil arrangement.
  • the arrangement has ironless coils LI, L2 and L3.
  • the coils LI, L2 and L3 can also be oil-insulated coils, such as oil-insulated coils of a Transforma sector.
  • the arrangement 1 may also have only two coils (for example, the first coil LI and the second coil L2).
  • the Anord tion 1 also have more than three coils. For example, four coils, five coils or even more than five coils can be arranged in the parallel circuit and electrically connected in parallel.
  • the second terminal 6 has a greater electrical potential than the first terminal 3.
  • the monitoring unit 9 is arranged in the embodiment substantially at the electrical potential of the second circuit 6 conclusion.
  • the signal 11 by means of the wireless transmission technology Sprint (for example, as a radio signal 20) and / or means of the optical waveguide 23 is a sufficient electrical cal insulation between the monitoring unit 9 and the monitoring receiver 12 ensured.
  • the first Stromsen sor Ml, the second current sensor M2 and / or the third current sensor M3 may preferably be configured in each case as a transducer.
  • the first current sensor Ml, the second current sensor M2 and / or the third current sensor M3 may preferably be configured in each case as a transducer.
  • the first current sensor Ml, the second current sensor M2 and / or the third current sensor M3 may preferably be configured in each case as a transducer.
  • the first current sensor Ml, the second current sensor M2 and / or the third current sensor M3 may preferably be configured in each case as a
  • Current sensor M2 and / or the third current sensor M3 can each be designed as a current transformer, for example (in each case For example, as a commercially available Lucasumaustromwandler).
  • the current transformers M1, M2 and M3 can advantageously be adapted with respect to their transmission ratio to the currents expected in each case for the individual coils In. This has the consequence that at each current transformer approximately equal output sizes (in particular equal seconds därströme) occur.
  • the monitoring unit 9 can be supplied with electrical energy which is latestkop pelt from one of these current transformers Ml, M2 or M3, from the totality of the current transformers Ml, M2 and M3 or from a separate current transformer.
  • the power supply of the monitoring unit 9 can thus be done either via one of the three current transformers Ml, M2 or M3, via all three current transformers or via a se paraten current transformer.
  • a separate current transformer it would be advantageous to separate the measuring technology and the power supply from each other (and use their own current transformers for measurement and for energy supply).
  • the monitoring unit can be supplied with electrical energy in a simple and cost-effective manner (especially in the case of high-voltage applications).
  • the monitoring unit 9 is a common monitoring unit 9 for all coils LI, L2 and L3 of the parallel circuit. This monitoring unit 9 is advantageously part of the arrangement.
  • the monitoring unit 9 is mechanically integrated into the arrangement and can therefore be arranged comparatively close to the current sensors M1, M2 and M3. be net. This avoids problems due to interference signals or reduced interference voltages.
  • the monitoring unit 9 can be mounted directly on a Tragan Regulation for the coils (in large air throttles, this support arrangement is also referred to as a supporting star).
  • the monitoring unit 9 may be provided in example with a sheath made of aluminum sheet.
  • the eddy currents occurring in this casing serve to shield the monitoring unit.
  • the magnetic field can be limited to an acceptable level.
  • An arrangement of the current sensors and the monitoring unit in the lower part of the arrangement may be advantageous because there is usually a lower operating temperature and thus the monitoring unit 9 is uncoupled from the current-induced heating of the throttle.
  • the first current sensor Ml is designed as a current transformer.
  • This current transformer Ml has a first secondary winding 205.
  • This first secondary winding 205 is connected to the electrical conductor via an iron core symbolized as a vertical line. ter, which leads the first current II of the first coil LI.
  • a first ohmic resistor 208 (first measuring resistor 208) is connected.
  • the voltage occurring at the first resistor 208 forms the first signal S1 (first voltage signal Sl), which describes the current difference DI1 of the associated coil LI (to the mean value of the coil currents).
  • This first signal Sl is transmitted to the monitoring unit 9.
  • the second current sensor M2 and the third current sensor M3 are each manufactured tet as a current transformer.
  • the second current transformer M2 has a second secondary winding 215 and a second measuring resistor 218.
  • the third current transformer M3 has a third secondary winding 225 and a third measuring resistor 228. The voltage occurring at the second measuring resistor 215 forms the second signal S2; the voltage applied to the third measuring resistor 225 forms the third signal S3.
  • the first secondary winding 205 of the first current transformer, the second secondary winding 215 of the second current transformer and the third secondary winding 225 of the third current transformer are arranged in a series connection, said Rei henscrien forms a closed loop.
  • the first Se kundärwicklung 205, the second secondary winding 215 and the third secondary winding 225 thus form a closed Ma tion.
  • this closed loop flows a current Iav *, which is proportional to the mean Iav of the currents flowing through the three coils LI, L2 and L3 currents II, 12 and 13.
  • the differences in current DIh are thus advantageously determined by that the secondary windings of the current transformers are arranged in a closed loop, so that flows through all the secondary windings of the same current lav.
  • the current differences DIh can be very easily averaged (by analog means). This is possible with simple Messtech technology with relatively low accuracy requirements. This avoids that in the vonwachungssein unit 9, the current differences DIh by arithmetic means he must be averaged.
  • n 1 where x is the number of coils of the parallel circuit.
  • the mean value Alav thus represents an averaged current difference Alav. Thereafter, the ratio of the respective current difference DIh and the mean value Alav is formed for each coil. The temporal change of this ratio DIh / hIav is monitored to see if the time change exceeds a predetermined threshold SW:
  • the monitoring unit 9 sends the monitoring signal 11 with data about the affected coil Ln to the monitoring receiver 12.
  • the monitoring signal 11 transmits data on the affected coil Ln, for example, a number or Ken tion (ID) of the affected by the Windungs gleich coil Ln.
  • ID Ken tion
  • the ratio Aln / Alav is monitored for the occurrence of a threshold value SW exceeding temporal change (ie, the occurrence of a large temporal change).
  • the current differences DIh are related to the average value Alav of the current differences of all coils.
  • a short circuit is also called winding short circuit.
  • a short-circuit monitoring for the arrangement can be realized, in particular a short-circuit monitoring for a choke with at least two coils (at least two layers).
  • the individual coils can be configured as cylindrical coils, which each form a concentric position of the arrangement.
  • the method described realizes a so-called magnifying function by applying a differential measurement. As eliminated by the influence of the absolute size of the spool currents II, 12 and 13, respectively.
  • Each coil is assigned its own current sensor, which is coupled to the current path of the coil. According to the expected current of the respective coil, the gear ratio of the current sensor (for example, a current transformer) is roughly adjusted to obtain uniform secondary currents of the current transformer.
  • the secondary windings of the current transformer are connected in series, wherein the series circuit are connected to a closed loop.
  • a middle current sets which describes the average Ren Iav the current flowing through the coils LI, L2 and L3 coil currents.
  • Each secondary winding is provided with a resistor connected in parallel (measuring resistor) in order to determine the current difference DIh for each coil.
  • the resistance value of the measuring resistor may also be adapted to the different coil currents II, 12 and 13, respectively, that during operation of the arrangement approximately equal voltages at the measuring resistances of the individual current transformers occur. This achieves a uniform evaluation (scaling) of the three parallel-connected currents.
  • the monitoring unit only evaluates the current differences DIh.
  • the absolute size of the currents II, 12 and 13 flowing through the coils and the absolute value of the mean value Iav are thereby eliminated as it were.
  • small permanent deviations between the individual current differences DIh will usually also set in normal operation, ie. H. in the absence of a turn conclusion.
  • the monitoring unit may in particular comprise the following units: A measuring unit with potential-free inputs, an evaluation unit with logic as described above, a radio data transmission unit and a power supply unit.
  • the monitoring unit can also be referred to as a sensor node, in particular as a sensor node with a logic unit.
  • the power supply unit may in particular have a rectifier and achronsta bilisator.
  • the signal cables used to transmit the signals Kings nen preferably be designed as Triaxialkul. These signal cables can be guided along an equipotential surface of the order, so for example along a support arrangement for the individual coils.
  • the two screens of the Triaxiallie can be placed on one side or both sides of the electrical potential of the support assembly (ie connected to this) to shield electrical and magnetic fields. Since the signal cables are laid in a heavily loaded electromagnetic field (for example in a Dros selfeld), it may be advantageous, instead of said voltage signals (measuring resistor voltages) To use current signals (differential currents). In this case, the monitoring unit 9 can have potential-separated Stromein courses.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

L'invention concerne une procédé de surveillance d'un dispositif électrique (1) comprenant une pluralité de bobines (L1, L2, L3) disposées électriquement dans un circuit parallèle. Dans ce procédé, la différence de courant (ΔI1, ΔI2, ΔI3, ΔI3) entre le courant traversant cette bobine (I1, I2, I3) et la valeur moyenne (Iav) des courants traversant les bobines (I1, I2, I3) est déterminée pour les bobines (L1, L2, L3) de la connexion parallèle. Les différences de courant (ΔI1, ΔI2, ΔI3, ΔI3) sont utilisées pour détecter quand un court-circuit se produit dans l'une des bobines.
EP18727205.9A 2018-05-17 2018-05-17 Procédé et dispositif de détection d'un court-circuit entre spires dans des enroulements disposés en parallèle Pending EP3776780A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/062902 WO2019219196A1 (fr) 2018-05-17 2018-05-17 Procédé et dispositif de détection d'un court-circuit entre spires dans des enroulements disposés en parallèle

Publications (1)

Publication Number Publication Date
EP3776780A1 true EP3776780A1 (fr) 2021-02-17

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Application Number Title Priority Date Filing Date
EP18727205.9A Pending EP3776780A1 (fr) 2018-05-17 2018-05-17 Procédé et dispositif de détection d'un court-circuit entre spires dans des enroulements disposés en parallèle

Country Status (5)

Country Link
US (1) US11131719B2 (fr)
EP (1) EP3776780A1 (fr)
CN (1) CN112154585B (fr)
CA (1) CA3100210C (fr)
WO (1) WO2019219196A1 (fr)

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CN111025196B (zh) * 2019-12-03 2024-08-13 国网河南省电力公司鹤壁供电公司 太阳能红外遥控ct极性检测装置
CN116420088A (zh) 2020-11-06 2023-07-11 西门子能源全球有限公司 对电线圈装置的运行的监视
CN114137443B (zh) * 2021-11-19 2022-09-27 华北电力大学 一种基于漏磁和压力的变压器匝间短路检测系统和方法

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CN112154585A (zh) 2020-12-29
US11131719B2 (en) 2021-09-28
CA3100210C (fr) 2021-11-16
WO2019219196A1 (fr) 2019-11-21
CA3100210A1 (fr) 2019-11-21

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