WO2022214202A1 - Disjoncteur à réservoir mort avec capteur de courant de rogowski - Google Patents

Disjoncteur à réservoir mort avec capteur de courant de rogowski Download PDF

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Publication number
WO2022214202A1
WO2022214202A1 PCT/EP2021/059357 EP2021059357W WO2022214202A1 WO 2022214202 A1 WO2022214202 A1 WO 2022214202A1 EP 2021059357 W EP2021059357 W EP 2021059357W WO 2022214202 A1 WO2022214202 A1 WO 2022214202A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
rogowski coil
dead
circuit breaker
measurement signal
Prior art date
Application number
PCT/EP2021/059357
Other languages
English (en)
Inventor
Anton Poeltl
Werner Hofbauer
Original Assignee
Hitachi Energy Switzerland 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 Hitachi Energy Switzerland Ag filed Critical Hitachi Energy Switzerland Ag
Priority to PCT/EP2021/059357 priority Critical patent/WO2022214202A1/fr
Publication of WO2022214202A1 publication Critical patent/WO2022214202A1/fr

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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
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • 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 disclosure relates to high voltage dead-tank circuit breakers and, more particularly, to high voltage dead-tank circuit breakers including current transformers.
  • Dead-tank circuit breakers are commonly found in substations and are operable to selectively open and close electrical connections contained within a sealed tank filled with dielectric material for reducing arcing.
  • FIGS 1 and 2 illustrate a conventional dead-tank circuit breaker 10.
  • the circuit breaker 10 is a three phase circuit breaker, and thus includes three pole assemblies including outer pole assemblies 12a and 12c and a central pole assembly 12b.
  • Each pole assembly includes a first electrical conductor 14 carried in a first bushing 16 and a second electrical conductor 18 carried in a second bushing 20.
  • Electrical power lines are coupled to the first and second electrical conductors, and the circuit breaker 10 selectively opens or closes the electrical connection therebetween.
  • an actuating mechanism such as a bell crank 22a, 22b, 22c, is associated with a respective pole assembly 12a, 12b and 12c.
  • Each pole assembly 12a, 12b and 12c includes a tank 24 that houses the electrical contacts 33a, 33b of the breaker 10 that are selectively opened/closed by the operating mechanism 23.
  • the tank 24 is filled with a gas arc-quenching medium to limit/suppress electrical arcing between the electrical contacts 33a, 33b when they are opened or closed.
  • Each tank 24 is fixed to a support frame 28.
  • a local control cubicle 37 also mounted to the support frame 28, houses electronic circuits that monitor and control the operation of the circuit breaker 10.
  • the standard circuits inside the local control cubicle 37 use electromechanical relays.
  • the electronic circuits may also include circuitry to monitor and control the operation of the circuit breaker.
  • a dead-tank circuit breaker includes a tank including a circuit interrupter therein, a bushing coupled to the tank and configured to receive an electrical conductor therethrough, a Rogowski coil around the electrical conductor outside the tank, the Rogowski coil configured to detect a current flow through the electrical conductor and to generate a measurement signal responsive to detecting the current flow through the electrical conductor, and a main electronics circuit configured to receive the measurement signal.
  • the dead-tank circuit breaker may further include a pre-amplifier mounted adjacent the Rogowski coil, wherein the pre-amplifier may be configured to amplify the measurement signal for transmission to the main electronics circuit.
  • the measurement signal generated by the Rogowski coil may be a voltage signal that may be proportional to a time derivative of current flowing through the electrical conductor.
  • the measurement signal may include an analog voltage signal.
  • the main electronics circuit may include an analog to digital converter that receives the measurement signal and converts the measurement signal to a digital measurement signal, and a digital signal processor that integrates the digital measurement signal.
  • the main electronics circuit may transmit the measurement signal to an external processing unit.
  • the dead-tank circuit breaker may further include a wire-wound current transformer around the bushing adjacent the electrical conductor adjacent the Rogowski coil, the wire-wound current transformer configured to detect the current flow through the electrical conductor.
  • the Rogowski coil may be mounted around the bushing.
  • the dead-tank circuit breaker may further include a second bushing coupled to the tank and configured to receive a second electrical conductor therethrough, a second Rogowski coil around the second electrical conductor, the second Rogowski coil configured to detect a current flow through the second electrical conductor.
  • the second Rogowski coil may be mounted around the second bushing.
  • the dead-tank circuit breaker may further include an integrator circuit coupled to the
  • Rogowski coil and configured to integrate the measurement signal.
  • Some embodiments provide a current sensor for a dead-tank circuit breaker including a tank having a circuit interrupter therein and an electrical conductor extending into the tank and coupled to the circuit interrupter.
  • the current sensor includes a Rogowski coil around the electrical conductor outside the tank, the Rogowski coil configured to detect a current flow through the electrical conductor and to generate a measurement signal responsive to detecting the current flow through the electrical conductor, and a main electronics circuit configured to receive the measurement signal.
  • the current sensor may further include a pre-amplifier mounted in the bushing adjacent the Rogowski coil, wherein the pre-amplifier is configured to amplify the measurement signal for transmission to the main electronics circuit.
  • the measurement signal generated by the Rogowski coil may be a voltage signal that is proportional to a time derivative of current flowing through the electrical conductor.
  • the measurement signal includes an analog voltage signal.
  • the main electronics circuit may include an analog to digital converter that receives the measurement signal and converts the measurement signal to a digital measurement signal, and a digital signal processor that integrates the digital measurement signal.
  • the main electronics circuit may transmit the measurement signal to an external processing unit.
  • the Rogowski coil may be around a bushing connected to the tank through which the electrical conductor extends.
  • the current sensor may further include an integrator circuit coupled to the Rogowski coil and configured to integrate the measurement signal.
  • a method of installing a current sensor on a dead-tank circuit breaker includes providing a Rogowski coil having an output lead, encircling a bushing connected to the dead-tank circuit breaker with the Rogowski coil, wherein the bushing is configured to receive an electrical conductor therethrough, wherein the Rogowski coil is mounted outside a tank of the dead- tank circuit breaker, and connecting the output lead to a main electronics circuit of the dead-tank circuit breaker.
  • Figure 1 is a front view of a conventional high voltage dead-tank circuit breaker.
  • Figure 2 is a side view of the conventional circuit breaker of Figure 1.
  • Figure 3 is a side view of a circuit breaker of in accordance with some embodiments.
  • Figure 4 is a block diagram that illustrates electrical components of a circuit breaker of in accordance with some embodiments.
  • Figure 5 is a side view of a circuit breaker of in accordance with further embodiments.
  • Figure 6 is a side view of a circuit breaker of in accordance with further embodiments.
  • FIG. 7 is a block diagram illustrating operations of installing a circuit breaker of in accordance with some embodiments.
  • FIG. 3 is a side view of a dead-tank circuit breaker 100 in accordance with some embodiments.
  • the circuit breaker 100 includes a first electrical conductor 14 carried in a first bushing 16 and a second electrical conductor 18 carried in a second bushing 20.
  • the bushings 16, 20 are coupled to a tank that encloses a circuit interrupter 33 including first and second electrical contacts 33a, 33b that are coupled to the first and second electrical conductors 14, 18, respectively.
  • Electrical power lines are coupled to the first and second electrical conductors.
  • the circuit breaker 100 selectively opens or closes the electrical connection between the first and second electrical conductors 14, 18, by selectively opening/closing the electrical contacts 33a, 33b of the circuit interrupter 33 inside the tank 24.
  • the circuit breaker 100 may be a three phase circuit breaker, and thus may include three pole assemblies.
  • the circuit breaker 100 includes an external opening/closing mechanism 23 that controls the connection between the electrical contacts 33a, 33b within the tank 24.
  • the tank 24 is fixed to a support frame 28.
  • a local control cubicle 37 also mounted to the support frame 28, houses a main electronic circuit 50.
  • the main electronic circuit 50 includes circuitry to process the signal from the Rogowski coil 40 (or a pre-amplifier coupled to the Rogowski coil 40) to make the signal available via analog or digital interfaces (such as, for example IEC-61850).
  • the main electronic circuit 50 also powers the pre-amplifier, if present. Additional circuitry may be provided in the local control cubicle 37 to monitor and control the operation of the circuit breaker 100.
  • Some embodiments described herein provide a dead-tank circuit breaker 100 including a current transformer mounted on the bushing 16 that utilizes a Rogowski coil 40 to sense current passing through the high-voltage conductor 14 protected by the bushing 16. Unlike gas-insulated substations that use Rogowski coils for current sensing, in some embodiments the Rogowski coil is mounted external to a grounded tank that houses the circuit breaker.
  • a Rogowski coil 40 for sensing current passing through high- voltage conductors.
  • a Rogowski coil is an electrical device for measuring alternating current (AC) or high-speed current pulses.
  • a Rogowski coil includes a helical coil of wire with the lead from one end returning through the center of the coil to the other end so that both terminals are at the same end of the coil. The Rogowski coil encircles the electrical conductor whose current is to be measured. When an alternating current is passed through the electrical conductor, a voltage is induced in the Rogowski coil that is proportional to the time rate of change of current in the electrical conductor. The output of the
  • Rogowski coil may be connected to an integrator circuit that generates an output signal that is proportional to the detected current in the electrical conductor.
  • a Rogowski coil for current sensing instead of or in addition to a wire-wound, ring-core current transformers may have a number of advantages relative to the use of wire-wound, ring-core current transformers alone.
  • a Rogowski coil has negligible resistive losses and requires no magnetic core. It may be highly accurate over a wide current range. Because it has no iron core to saturate, it is highly linear even when subjected to large currents. Due to its low inductance, a Rogowski coil can respond to fast-changing currents, down to several nanoseconds.
  • the output of the Rogowski coil 40 can be analog, in which case it can be fed into a merging unit or digitally sampled to generate a digital signal that conforms to IED 61850 SV.
  • a Rogowski coil is smaller than an equivalently rated wire-wound current transformer.
  • Some embodiments provide a dead-tank circuit breaker 100 including a Rogowski coil 40 and associated electronic circuitry 42, 50.
  • the Rogowski coil 40 is mounted within a covered spindle 45 around the high voltage conductor 14 that passes through the bushing 16, and is external to the tank 24 of the circuit breaker 100.
  • the electronic circuitry may include a pre-amplifier 42 for amplifying the voltage signal output by the Rogowski coil 40 and a main electronics circuit 50 mounted in the cubicle 37 that receives and processes the amplified signal.
  • the pre-amplifier 42 may be co-located with the Rogowski coil 40 on the bushing 16. By locating the pre-amplifier 42 with the Rogowski coil 40, the signal-to-noise ratio (SNR) of the signal output by the pre-amplifier 42 may be increased.
  • SNR signal-to-noise ratio
  • a shielded cable 44 transports the signal to the main electronics circuit 50.
  • the shielded cable may also include a powered conductor for powering the pre-amplifier 42.
  • the Rogowski coil 40 and the high-voltage conductor 14 are shown.
  • the Rogowski coil 40 includes a helical coil of wire with the lead from one end 40a returning through the center of the coil to the other end 40b of the coil so that both terminals are at the same end 40b of the coil 40. Because of this construction, the coil 40 includes an opening between the ends 40a, 4b of the coil 40.
  • the output of the Rogowski coil 40 is amplified by a pre-amplifier 42.
  • An optional analog integrator circuit 43 may be used to integrate the signal output by the pre-amplifier 42.
  • the design of amplifier circuits and integrator circuits is well known in the art.
  • the main electronics circuit 50 may include an analog-to-digital converter (ADC) 52 that converts the amplified signal to a digital signal for further processing, a digital signal processor (DSP) 54 and a microprocessor 56.
  • ADC analog-to-digital converter
  • DSP digital signal processor
  • the main electronic circuit 50 converts the amplified signal to a digital signal using the ADC 52, which provides the digital signal to the DSP 54.
  • the DSP 54 may integrate the digital signal to obtain an output digital signal that is proportional to current passing through the high voltage conductor 14.
  • the output digital signal may be processed by a microprocessor 56 to convert the signal to values conforming to a standard, such as IEC 61850.
  • Figure 5 illustrates a dead-tank circuit breaker 100' according to further embodiments.
  • the dead-tank circuit breaker 100' of Figure 5 is similar to the dead-tank circuit breaker 100 of Figure 3 (with like numbers referring to like elements), except that the dead-tank circuit breaker 100' includes a wire-wound current transformer 47 in additional to the Rogowski coil 40.
  • the wire-wound current transformer 47 provides an analog current sensing output that makes the dead-tank circuit breaker 100' backward-compatible with electronic circuits that do not support a digital current sensing signal.
  • Figure 6 illustrates a dead-tank circuit breaker 100" according to further embodiments.
  • the dead-tank circuit breaker 100" of Figure 6 is similar to the dead-tank circuit breaker 100 of Figure 3 (with like numbers referring to like elements), except that the dead-tank circuit breaker 100" includes
  • the dead-tank circuit breaker 100" can thereby detect current faults based on currents in both high-voltage conductors 14, 18.
  • the use of a Rogowski coil as a current sensor for a dead-tank circuit breaker may provide additional benefits, such as reduced installation/replacement costs and/or reduced installation/replacement time.
  • the installation of a conventional current transformer on a circuit breaker is costly and difficult, in part because conventional current transformers use large, heavy iron cores.
  • the current transformer is typically installed on a dead-tank circuit breaker by lowering it with a crane onto a support spinning mounted to the tank before the high voltage conductors are attached.
  • a Rogowski coil has no core and is open (i.e., does not form a closed loop).
  • a Rogowski coil can therefore be installed or removed from a dead-tank circuit breaker without need of a crane and with the high voltage conductor in place, which can significantly reduce the time and/or expense needed for installation and maintenance of the current sensor.
  • a current sensor based on a Rogowski coil can be refit to an existing installation to provide a redundant or additional current sensor to an existing installation that includes a conventional current transformer.
  • some embodiments provide a method of installing a current sensor on a dead-tank circuit breaker 100 including a tank 24.
  • the method includes providing (block 702) a Rogowski coil 40 having an output lead 41a, encircling (block 704) a bushing 16 connected to the dead-tank circuit breaker 100 with the Rogowski coil 41, and connecting (block 706) the output lead 41a to a main electronics circuit 50 of the dead-tank circuit breaker 100.
  • the Rogowski coil 100 may be installed with a high voltage conductor 14 in place within the bushing 16.
  • the Rogowski coil 40 incudes a first end 40a and a second end 40b, wherein the output lead 41a extends from the second end 40b of the coil 40.
  • the Rogowski coil 40 may be installed by extending the first end 40a of the Rogowski coil 40 into a covered spindle 45 on the tank 24 and encircling the high voltage conductor
  • Coupled may include wirelessly coupled, connected, or responsive.
  • the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • Well-known functions or constructions may not be described in detail for brevity and/or clarity.
  • the term “and/or” includes any and all combinations of one or more of the associated listed items.
  • the phrase “at least one of A and B” means “A or B" or "A and B".
  • Example embodiments are described herein with reference to block diagrams and/or flowchart illustrations of computer-implemented methods, apparatus (systems and/or devices) and/or computer program products. It is understood that a block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions that are performed by one or more computer circuits.
  • These computer program instructions may be provided to a processor circuit of a general purpose computer circuit, special purpose computer circuit, and/or other programmable data processing circuit to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, transform and control transistors, values stored in memory locations, and other hardware components within such circuitry to implement the functions/acts specified in the block diagrams and/or flowchart block or blocks, and thereby create means (functionality) and/or structure for implementing the functions/acts specified in the block diagrams and/or flowchart block(s).

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  • 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

Un disjoncteur à réservoir mort comprend un réservoir comprenant un interrupteur de circuit à l'intérieur de celui-ci, une douille couplée au réservoir et conçue pour recevoir un conducteur électrique à travers celle-ci, et une bobine de Rogowski autour du conducteur électrique à l'extérieur du réservoir. La bobine de Rogowski est conçue pour détecter un flux de courant à travers le conducteur électrique et pour générer un signal de mesure en réponse à la détection du flux de courant à travers le conducteur électrique. Le disjoncteur à réservoir mort comprend en outre un circuit électronique principal conçu pour recevoir le signal de mesure.
PCT/EP2021/059357 2021-04-09 2021-04-09 Disjoncteur à réservoir mort avec capteur de courant de rogowski WO2022214202A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/059357 WO2022214202A1 (fr) 2021-04-09 2021-04-09 Disjoncteur à réservoir mort avec capteur de courant de rogowski

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/059357 WO2022214202A1 (fr) 2021-04-09 2021-04-09 Disjoncteur à réservoir mort avec capteur de courant de rogowski

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WO2022214202A1 true WO2022214202A1 (fr) 2022-10-13

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214544A (en) * 1961-03-24 1965-10-26 Westinghouse Electric Corp Cooling structures for closed-system gaseous electrical apparatus having terminal bushings
US4810840A (en) * 1987-07-02 1989-03-07 Mitsubishi Denki Kabushiki Kaisha Dead tank circuit breaker
EP3055702A1 (fr) * 2013-10-09 2016-08-17 ABB Research Ltd. Dispositif de mesure de courant et procédé utilisant un transducteur de courant de type rogowski
DE102019211950B3 (de) * 2019-08-08 2020-11-26 Siemens Aktiengesellschaft Messen einer elektrischen Spannung an einem metallgekapselten Schaltgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214544A (en) * 1961-03-24 1965-10-26 Westinghouse Electric Corp Cooling structures for closed-system gaseous electrical apparatus having terminal bushings
US4810840A (en) * 1987-07-02 1989-03-07 Mitsubishi Denki Kabushiki Kaisha Dead tank circuit breaker
EP3055702A1 (fr) * 2013-10-09 2016-08-17 ABB Research Ltd. Dispositif de mesure de courant et procédé utilisant un transducteur de courant de type rogowski
DE102019211950B3 (de) * 2019-08-08 2020-11-26 Siemens Aktiengesellschaft Messen einer elektrischen Spannung an einem metallgekapselten Schaltgerät

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS ED - ANONYMOUS: "IEEE Guide for the Application of Rogowski Coils Used for Protective Relaying Purposes; IEEE Std C37.235-2007", 22 February 2008, IEEE STANDARD; [IEEE STANDARD], IEEE, PISCATAWAY, NJ, USA, PAGE(S) C1 - 45, ISBN: 978-0-7381-5713-9, XP017601862 *
SKENDZIC VESELIN ET AL: "Using Rogowski coils inside protective relays", 2013 66TH ANNUAL CONFERENCE FOR PROTECTIVE RELAY ENGINEERS, IEEE, 8 April 2013 (2013-04-08), pages 1 - 10, XP032598347, DOI: 10.1109/CPRE.2013.6822022 *
VARDHAN HARSH ET AL: "Deploying digital substations: Experience with a digital substation pilot in North America", 2018 71ST ANNUAL CONFERENCE FOR PROTECTIVE RELAY ENGINEERS (CPRE), IEEE, 26 March 2018 (2018-03-26), pages 1 - 9, XP033336071, DOI: 10.1109/CPRE.2018.8349795 *

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