EP2070172A1 - Système de protection redondant et procédé de surveillance redondante d'objets protégés dans un réseau d'alimentation en énergie électrique - Google Patents

Système de protection redondant et procédé de surveillance redondante d'objets protégés dans un réseau d'alimentation en énergie électrique

Info

Publication number
EP2070172A1
EP2070172A1 EP06805374A EP06805374A EP2070172A1 EP 2070172 A1 EP2070172 A1 EP 2070172A1 EP 06805374 A EP06805374 A EP 06805374A EP 06805374 A EP06805374 A EP 06805374A EP 2070172 A1 EP2070172 A1 EP 2070172A1
Authority
EP
European Patent Office
Prior art keywords
protection
protective
protection device
devices
main
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Withdrawn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
EP06805374A
Other languages
German (de)
English (en)
Inventor
Klaus BÖHME
Gerhard Lang
Ludwig Schiel
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 AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP2070172A1 publication Critical patent/EP2070172A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • 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
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals

Definitions

  • Redundant protection system and method for redundant monitoring of protection objects in an electrical energy supply network Redundant protection system and method for redundant monitoring of protection objects in an electrical energy supply network
  • the invention relates to a redundant protection system for monitoring protective objects in an electrical energy supply network having at least two protective devices detachable from the electrical power supply network and at least two electrical protection devices, wherein the number of electrical protection devices corresponds to the number of protective objects and wherein each electrical protection device on the one hand with sensors for detecting voltage and / or current measured values which characterize the voltage applied to the respective protected object and / or the current flowing through the respective bulk object, and, on the other hand, to the circuit breaker associated with the respective protected object via command outputs for delivering a fault indicating trigger signal is in communication.
  • the invention also relates to a method for the redundant monitoring of protective objects in an electrical energy supply network.
  • protection rates are usually used.
  • a protective device detects currents and / or voltages on the respective protected object via measuring converter devices and evaluates the measured values using protective algorithms to determine whether an error, for example a ground fault, or a conductor-conductor is present on the protected object. Conclusion, occurred. If an error is detected, the protective device generates a tripping signal, which causes a circuit breaker to open its switch contacts and, as it were, disconnects the faulty protective object from the rest of the energy supply network.
  • protection devices are complex devices in a fault-sensitive system, redundancy requirements are frequently made in order to provide a backup protection device in the event of the failure of a protection device, which can take over the functions of the failed protection device without interruption.
  • Figure 1 shows a commonly used redundancy concept in the monitoring of protective objects in an electrical energy supply network.
  • electrical protective devices are used as main protective devices 14a, 14b, which detect current and voltage measurement values via current transformer devices 15a, 15b and voltage transformer devices 16a, 16b and evaluate them with the aid of protection algorithms.
  • the respective main protection device In the case of a fault on one of the branches 12a, 12b, the respective main protection device generates a trigger signal for opening the respective circuit breaker 13a, 13b.
  • a backup protection device 17a, 17b is provided parallel to each of the main protection devices 14a, 14b. If one of the main protection devices 14a, 14b fails, the respective reserve protection device 17a, 17b can take over its protective functions.
  • US Pat. No. 6,567,256 B1 discloses a similar protection system for monitoring branches in an electrical energy supply network, in which a separate protective device is assigned to each phase conductor of the branch. Since short circuits on three-phase energy supply lines often involve at least two phase conductors, two of the protective devices protecting the individual phase conductors each form a redundant monitoring system so that a second protective device is still present if one protective device fails.
  • a disadvantage of this protection system is that in the case of failure of one of the protection devices 23a, 23b at the branches 22a, 22b by the additional protection device 24, the entire busbar 21 including all outgoing branches 22a, 22b is turned off, so inevitably from this shutdown faultless branches are affected.
  • a protection device is used as the main protection device 31 for the simultaneous monitoring of two branches 32a, 32b.
  • the main protection device 31 may be connected in parallel with a second protection device as a reserve protection device 33, which assumes its protective tasks in the event of a failure of the main protection device 31.
  • a disadvantage of this system is the comparatively high utilization of the two branches 32a, 32b simultaneously protecting main protection device 31st
  • the object of the invention is to specify a redundant protection system and a method for the redundant monitoring of protective objects in an electrical energy supply network, with which a high degree of availability of the protection is ensured at the lowest possible cost.
  • this object is achieved by a redundant protection system for monitoring protective objects in an electrical energy supply network of the type mentioned, in which the at least two electrical protection devices are each set up for a protection object as the main protection device and an additional electrical protection device is provided for Detection of the voltage and / or current measured values and for the at least two protective objects is set up as a backup protection device, in case of failure of one of the main protection devices of a protected object, the additional protection device is set up to take over the protection functions for the failing main protection device associated protection object.
  • the advantage of the protection system according to the invention is that a high degree of availability of the protection is achieved by initially assigning each protection object its own protection device as the main protection device, but the backup protection is formed by a common additional protection device. This is based on the finding that a protective device for several protective objects can be used when using protective devices with sufficient computing power.
  • the invention combines the advantages of a protection system in which each protection object is assigned a separate protection device, with a system in which a single protection device is responsible for multiple objects protection. Since the probability that several main protective devices fail at the same time is comparatively low, it is sufficient, according to the solution according to the invention, to have a reserve protection device for all protective objects. If a main protection device fails, the reserve protection device can take the place of the main protection device due to its high computing capacity and additionally form the back-up protection for the remaining main protection devices until the failed main protection device has been replaced or repaired.
  • a local process bus connected to the respective protection object is provided for the main protection devices for detecting the voltage and / or current measurement values and for outputting the trigger signal, and for the reserve protection device for detecting the voltage and current and / or current readings and for the delivery of the triggering signal, a cross-process bus connected to all protection objects, which is different from the local process buses is.
  • a separate communication system for transmitting the measured values is created, which supplies the individual main protective devices in each case via separate process buses and the backup protection device via an overarching process bus with the corresponding voltage and / or current measured values of the protective objects. In this way, the overload of a single process bus due to excessive amounts of data can be effectively avoided.
  • an additional reserve protection device may further be provided as an advantageous development, which is arranged in parallel with the first backup protection device.
  • the above-mentioned object is achieved by a method for redundantly monitoring protective objects in an electrical energy supply network, in which voltage and / or current measured values characterize the voltage applied to the respective protected object and / or the current flowing through a respective protected object to be recorded; the voltage and / or current measured values are transmitted, on the one hand, to the main electrical protection device assigned to the respective protection object and, on the other hand, to a reserve protection device which is assigned to all protection objects; the voltage and / or current measured values are monitored and an output signal is generated with the respective main protective device if the voltage and / or current measured values indicate an error in the respective protected object, the tripping signal comprising a circuit breaker for disconnecting the faulty protected object the energy supply network causes;
  • the main protection devices are monitored by the backup protection device, and upon detection of a failure of one of the main protection devices, the protection functions for the failed main protection device become assigned protection object by the reserve protection device.
  • the voltage and / or current measured values are respectively transmitted to the respective main protective device via a separate local process bus and the voltage and / or current measured values are transmitted to the reserve protection device via a crossover device connected to all the protective objects.
  • the process bus which is different from the local process buses, are transmitted.
  • each electrical protection device is assigned to a protected object as main protection device and exactly another protected object as backup protection device, in case of failure of a main protection device of a protected object respective reserve protection device is set up to take over the protection functions for this protection object.
  • this protective system provides several electrical protective devices according to the number of protective objects. Since each electrical protection device is assigned to exactly one protection object as main protection device and exactly one other protection object as backup protection device, a completely redundant protection system can be created in this way even with more than two protection objects with only one protection device per protection object.
  • Figure 1 shows a first embodiment of a redundant protection system according to the prior art
  • Figure 2 shows a second embodiment of a redundant protection system according to the prior art
  • Figure 3 shows a third embodiment of a redundant protection system according to the prior art
  • Figure 4 shows a redundant protection system with two
  • Figure 5 is a schematic representation of a redundant
  • Protection system with three main protection devices and one backup protection device to explain the process buses used to transmit the measured values;
  • FIG. 6 shows a redundant protection system with two protection objects and two protection devices for the protection objects main protection and backup protection
  • FIG. 7 shows a redundant protection system with three protective objects and three protective devices carrying three main and backup protections.
  • FIG. 4 shows an exemplary embodiment of a redundant protection system. It can be seen a busbar 41, which communicates with an otherwise not further illustrated electrical power grid. From the busbar 41, two protective objects are in the form of branches 42a and 42b. The branches 42a and 42b may lead to not further illustrated electrical loads, such as electric motors. Via circuit breakers 43a and 43b, the branches 42a and 42b can be disconnected from the busbar 41 and thus from the rest of the power supply network in the event of a fault. In order to monitor the branches 42a, 42b for faults, electrical protective devices 44a, 44b are provided at the branches 42a, 42b, which detect the current measured values characterizing the electrical current flowing through the respective branches 42a, 42b via current converter devices 45a, 45b.
  • electrical protective devices 44a, 44b are provided at the branches 42a, 42b, which detect the current measured values characterizing the electrical current flowing through the respective branches 42a, 42b via current converter devices 45a, 45b.
  • the voltage measurement values characterizing the voltage applied to the respective branch 42a, 42b can be detected with the voltage converter devices not shown in FIG. 4 for the sake of clarity.
  • the respective electrical protection device 44a, 44b using so-called protection algorithms, make a decision as to whether or not there is a fault on the respective branch 42a, 42b.
  • the respective electrical protection device 44a, 44b outputs a trigger signal A via a command output to the respective circuit breaker 43a, 43b in order to cause it to open its switching contacts and thus faulty branch 42a, 42b separate from the rest of the power grid.
  • the electrical protection devices 44a, 44b normally perform the protective functions for the protective object assigned to them, ie in this case the branches 42a and 42b, they represent the main protective devices for the branches 42a, 42b.
  • a common backup protection device 46 is provided, which can take over protection functions for each of the branches 42a, 42b.
  • the reserve protection device 46 also receives current and / or voltage measured values from separate current transformer devices 45a, 45b and possibly separate voltage converter devices.
  • current and / or voltage measured values for a main protection device and a backup protection device are in each case separated by means of a separate current. Voltage transformer detected. This case is shown in the figures. However, it is also conceivable instead for main and backup protection devices for Stromtial. Voltage detection to use the same current orchrochromwand- ler votes.
  • the reserve protection device 46 makes a decision as to whether or not there is an error on the respective branch 42a, 42b.
  • the reserve protection device 46 also has the option of causing the power switches 43a, 43b to open their switching contacts via a triggering signal.
  • the backup protection device 46 will however not send a triggering signal to the power switches 43a, 43b, since it works only in the background, but initially does not perform active protection functions. However, if one of the main protection devices 44a, 44b fails, it can seamlessly take over its functions since, as already mentioned, the current and / or voltage measurement values required for the determination of the decision are continuously (ie also in the case of functional main protection devices 44a, 44b) Branches 42a, 42b gets transmitted.
  • the failure of one of the main protection devices 44a, 44b can be recognized by the reserve protection device 46 in various ways.
  • a regular exchange of signals can take place which indicate the full functionality of the main protection devices 44a, 44b.
  • the backup protection device 46 closes on the failure of one of the main protection devices and seamlessly takes over its functions for the corresponding branch 42a, 42b.
  • the backup protection device recognizes that despite an error occurring on one of the branches 42a, 42b, the corresponding main protection device 44a, 44b the circuit breaker 43a, 43b has not triggered. In this case, it may be the complete failure of the main protection device 44a, 44b, but also a malfunction of the main protection device 44a, 44b limited to the current fault situation. Such a malfunction may occur, for example, due to incorrect parameterization, which results in the main protective device 44a, 44b not giving a tripping signal to the circuit breaker 43a, 43b despite a fault on the branch 42a, 42b.
  • the backup protection device 46 can independently decide on the basis of the current and / or voltage measured values transmitted to it, if there is a fault on the respective branch 42a, 42b, it may be the case that the main protection device does not have the corresponding power switch 43a, 43b has triggered, in its place a Ausl ⁇ sesig- signal to the circuit breaker 43a, 43b and thus separate the faulty branch 42a, 42b from the rest of the power grid.
  • the reserve protection device 46 for example, wait for a predetermined waiting time, within which a triggering would have to be done by the main protection device and after expiry of the waiting time, without the main protection device has made a trip, make their own tripping of the corresponding circuit breaker.
  • the backup protection device can conclude a malfunction of the main protection device 44a, 44b and take over in its place the protection functions for the protection object assigned to it, ie the branch 42a or 42b.
  • a failure signal can additionally be sent to the operator of the electrical energy supply network, which, for example, in a control network. Wait indicates that a main protection device 44a, 44b has failed.
  • the backup protection device 46 should be a protection device with a correspondingly powerful calculation unit, e.g. a microprocessor that can simultaneously perform protection algorithms for multiple protection objects. Since the number of protective objects monitored by a backup protection device 46 is not limited to two, with a high number of protection objects to be monitored, another backup protection device (not shown in FIG. 4, see FIG. 5) can be connected in parallel to the backup protection device 46 be that with the first reserve protection device 46 divides the monitoring of the protected objects.
  • FIG. 5 The transmission of the voltage and / or current measured values between the individual protective objects and the respective main protective devices or the reserve protective device shall be explained with reference to FIG.
  • three protective objects 51a, 51b, 51c are shown very schematically in FIG. 5, which may, for example, be branches of a busbar, electric motors, generators or other primary electrical components of an electrical energy supply network.
  • Each of the protective objects 51a, 51b, 51c is assigned a main protection device 52a, 52b, 52c, which normally performs the protective functions for the electrical protection object 51a, 51b, 51c.
  • current and / or voltage measured values are recorded at each protective object 51a, 51b, 51c and respectively coupled to a local process bus 53a, 53b, 53c.
  • Such a rather local process bus connects the respective protected object 51a, 51b, 51c with its associated main protection device 52a, 52b, 52c.
  • the measured values can be transmitted in analog or digital form. In a digital transmission, the measured values can be For example, according to the Ethernet standard to the protection devices 52a, 52b, 52c are transmitted.
  • a common reserve protection device 54 is provided.
  • This backup protection device 54 receives the current and / or voltage measured values acquired at all protective objects 51a, 51b, 51c. These are communicated between the respective protection object 51a, 51b, 51c and the backup protection device 54 via a cross-process process bus 55.
  • the main protective devices receive the measured values from the respective associated protective object 51a, 51b, 51c at a sampling rate of 10 kHz, while the backup protective device 54 only supplies the recorded measured values from each of the protective objects 51a, 51b, 51c get a sampling rate of 1 kHz transmitted.
  • the measured values are used for this purpose with the respectively connected to the main protection devices or the reserve protection device Stromnd. Voltage converters recorded with correspondingly different sampling rates; thus, the persons entering the main protection rate connected current or voltage converter devices, for example, with a sampling rate of 10 kHz, while the connected to the reserve protection device Stromnd. Voltage transformers record their measurements with a reduced sampling rate of 1 kHz, for example.
  • the lower sampling rate enables the transmission of measured values of all protection objects on the overall process bus, without overloading the transmission bandwidth of the overall process bus.
  • the backup protection device 54 for the corresponding protection object 51a, 51b, 51c whose main protection device 52a, 52b, 52c has failed can perform the highest quality protection functions since it receives its measured values at maximum transmission rate.
  • the sampling rate used in the current or voltage transformers can be set to different values.
  • the current or voltage conversion means present on the corresponding protection object 51a, 51b, 51c can be automatically set to a higher sampling rate, and instead of the reduced sampling rate of e.g. 1 kHz, their measurements at the full sampling rate of e.g. Pick up 10 kHz and couple it into the overall process bus.
  • the backup protection device 54 Since the number of protective objects which are monitored by the backup protection device 54 is not limited to three, a high level of protection objects to be monitored can provide to the backup protection device 54 another backup protection device 56. be connected in parallel, which splits with the first backup protection device 46, the monitoring of the protected objects or the redundancy of the system further increased by it can take over its functions in case of failure of the backup protection device.
  • a bus bar 61 is provided, depart from the two branches 62a and 62b.
  • Each branch can be separated from the busbar and thus from the rest of the power supply network by an associated circuit breaker 63a, 63b.
  • two protective devices 64 and 65 are provided for monitoring the branches 62a, 62b for possibly occurring faults.
  • the protective devices 64 and 65 receive current measured values recorded by the current converter devices 66a, 66b as well as voltage measurement values which may also be corresponding to voltage converter devices, not shown.
  • each of the protective devices 64, 65 can output to the power switches 63a, 63b a trigger signal that causes the power switch to open its switch contacts.
  • the protection devices 64 and 65 are configured such that the protection device 64 for the branches 62b functions as the main protection device and for the branch 62a as the backup protection device.
  • the protective device 65 is set up in such a way that it functions as the main protection device for the branch 62a and as the reserve protection device for the branch 62b.
  • the area performing the main protection is shown in solid lines, while the area performing the backup protection is shown in dashed lines.
  • each protection device 64, 65 also acts as a backup protection device for the.
  • each other branch 62a, 62b Each other branch 62a, 62b. If one of the protective devices, for example the protective device 64, fails, then the other protective device, here the protective device 65, in addition to its main protective function for the branch 62a, also assumes the full protection function for the branch 62b.
  • the protection system according to FIG. 6 is likewise based on the fact that protection devices with comparatively high computing power are nowadays available that can perform protective functions for a plurality of protective objects.
  • An advantage of the redundant protection system shown in FIG. 6 is that, despite the use of relatively fewer protective devices - namely only one protective device per protected object - complete redundancy for the protection of the protective objects 62a, 62b is obtained.
  • each of the protection devices 64, 65 is normally
  • the backup protection function can normally be carried out with reduced power, that is, for example, as already explained, with current and voltage measured values of a lower sampling rate.
  • the failure detection of one of the two protective devices 64, 65 can be carried out analogously to the methods explained in FIG. 4.
  • FIG. 7 shows a sam- busbar 71, depart from the branches 72a, 72b, 72c.
  • the branches 72a, 72b, 72c can be switched off by power switches 73a, 73b, 73c.
  • three protection devices 74, 75, 76 are present, each of the protection devices 74, 75, 76 is assigned to exactly one protection object as the main protection device and exactly one other protection object as backup protection device.
  • the protective device 74 is associated with the branch 72a as the main protection device and the branch 72b as the reserve protection device.
  • the protective device 75 is assigned to the branch 72b as the main protection device and the branch 72c as the reserve protection device, while the protection device 76 is assigned to the branch 72c as the main protection device and the branch 72a as the reserve protection device.
  • each protection object is assigned exactly one main protection device and a different backup protection device.
  • protection device 74, 75, 76 assigned to it as a reserve protection device can assume its protective functions, so that full redundancy for the protection of the protective objects 72a, 72b, 72c is reached.
  • the number of protective objects is not limited to three, but any number of protective objects can be protected with a correspondingly equal number of protective devices.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un système de protection redondant pour surveiller des objets (42a, 42b) protégés dans un réseau d'alimentation en énergie électrique comprenant au moins deux objets (42a, 42b) protégés et au moins deux appareils (44a, 44b) de protection électriques. Pour accroître selon l'invention la disponibilité d'un tel système de protection, les deux appareils (44a, 44b) de protection électriques ou plus sont chacun configurés comme un appareil de protection principal pour un objet (42a, 42b) protégé et il est prévu un appareil (46) de protection électrique supplémentaire faisant office d'appareil de protection de réserve pour tous les objets (42a, 42b) protégés. En variante, il est également possible de prévoir d'affecter chaque appareil (64, 65) de protection électrique à exactement un objet (62a, 62b) protégé en tant qu'appareil de protection principal et en tant qu'appareil de protection de réserve à exactement un autre objet protégé. L'invention concerne également un procédé de surveillance redondante des objets protégés d'un réseau d'alimentation en énergie.
EP06805374A 2006-10-04 2006-10-04 Système de protection redondant et procédé de surveillance redondante d'objets protégés dans un réseau d'alimentation en énergie électrique Withdrawn EP2070172A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2006/001754 WO2008040263A1 (fr) 2006-10-04 2006-10-04 Système de protection redondant et procédé de surveillance redondante d'objets protégés dans un réseau d'alimentation en énergie électrique

Publications (1)

Publication Number Publication Date
EP2070172A1 true EP2070172A1 (fr) 2009-06-17

Family

ID=38904614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06805374A Withdrawn EP2070172A1 (fr) 2006-10-04 2006-10-04 Système de protection redondant et procédé de surveillance redondante d'objets protégés dans un réseau d'alimentation en énergie électrique

Country Status (3)

Country Link
EP (1) EP2070172A1 (fr)
DE (1) DE112006004166A5 (fr)
WO (1) WO2008040263A1 (fr)

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EP2159893A1 (fr) * 2008-08-29 2010-03-03 ABB Research LTD Systèmes d'automatisation d'une sous-station avec protection redondante
EP2273644A1 (fr) * 2009-07-07 2011-01-12 ABB Research Ltd. Système d'automatisation de sous-station avec fonctions de protection
WO2011121386A1 (fr) * 2010-03-31 2011-10-06 Abb Research Ltd Procédé de transfert de la commande entre deux dispositifs dans un système de sous-station, ainsi que dispositif correspondant
JP5926539B2 (ja) * 2011-11-11 2016-05-25 株式会社東芝 保護制御システム、保護制御装置、およびマージングユニット
EP3460935B1 (fr) 2017-09-22 2021-06-16 ABB Schweiz AG Procédé et système de protection d'alimentation dans un réseau d'alimentation électrique

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DE3570160D1 (en) * 1984-07-31 1989-06-15 Bbc Brown Boveri & Cie Protective device for an electrical-power system
US6567256B1 (en) * 1993-08-06 2003-05-20 Schweitzer Engineering Labs, Inc. Dual protective relay for power systems
US7058482B2 (en) * 2002-02-25 2006-06-06 General Electric Company Data sample and transmission modules for power distribution systems
EP1450459A1 (fr) * 2003-02-20 2004-08-25 Abb Research Ltd. Sous-station avec des barres omnibus tolérante aux défauts avec des interrupteurs de protéction et methode de contrôle d'une telle sous-station

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104685750A (zh) * 2012-08-03 2015-06-03 Abb技术股份公司 用于保护变压器的可靠设备
CN104685750B (zh) * 2012-08-03 2018-07-31 Abb瑞士股份有限公司 用于保护变压器的可靠设备

Also Published As

Publication number Publication date
DE112006004166A5 (de) 2009-09-10
WO2008040263A1 (fr) 2008-04-10

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