WO2008134994A1 - Ensemble de protection pour un système d'alimentation en énergie, doté d'une barre omnibus, d'une branche d'alimentation et d'une dérivation - Google Patents

Ensemble de protection pour un système d'alimentation en énergie, doté d'une barre omnibus, d'une branche d'alimentation et d'une dérivation Download PDF

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Publication number
WO2008134994A1
WO2008134994A1 PCT/DE2007/000816 DE2007000816W WO2008134994A1 WO 2008134994 A1 WO2008134994 A1 WO 2008134994A1 DE 2007000816 W DE2007000816 W DE 2007000816W WO 2008134994 A1 WO2008134994 A1 WO 2008134994A1
Authority
WO
WIPO (PCT)
Prior art keywords
protection
branch
protection unit
feed
unit
Prior art date
Application number
PCT/DE2007/000816
Other languages
German (de)
English (en)
Inventor
Matthias Kereit
Tevfik Sezi
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/DE2007/000816 priority Critical patent/WO2008134994A1/fr
Priority to DE112007003587T priority patent/DE112007003587A5/de
Publication of WO2008134994A1 publication Critical patent/WO2008134994A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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

Definitions

  • the invention relates to a protective arrangement for a power supply system having at least one busbar, at least one feed branch connected to the busbar and at least one branch connected to the busbar, the feed branch being provided with a feed-in protection unit and the branch having a branch protection unit.
  • Such a protective arrangement serves to monitor and protect the energy supply system, which is embodied in particular as a medium-voltage power supply system, that is to say for busbar and branch nominal voltages in the range between approximately 5 and 40 kV.
  • the feed branch of such a power supply system contains a transformer for converting the high-voltage side rated voltage of e.g. 110 kV to a nominal voltage in said medium voltage range.
  • a circuit breaker is provided in the feed branch and in each branch. The feeder protection unit and the branch protection units initiate a switch-off command on the circuit breakers assigned to each of them if they detect a critical situation in the area they are monitoring in each case.
  • the protection units can perform various protection and monitoring functions.
  • a transformer differential protection, an overcurrent protection, an earth current monitoring, an overload protection and possibly also a branch reserve protection are available in the supply branch.
  • the feeder protection unit and all feeder protection units can also be used to implement a simple busbar protection with rear locking.
  • a two-part single or double busbar with two feed branches each can be provided.
  • the busbar is switched off completely in the event of a recognized or emerging thermal overload of the feeding transformer. This complete shutdown can only be avoided by means of a very complex and costly fully redundant design of the feed.
  • the branch protection units have no possibility to connect a voltage transducer. If such a converter input is present, it is usually not occupied for cost reasons. A fault location is therefore not or only possible with currently common protection arrangements for medium-voltage power supply systems.
  • a substation computer is required for connection to the power supply point, to which the power protection unit and all branch protection units are connected. Again, this is associated with effort. Overall, in known protective arrangements, a high availability of the monitored power supply system can be achieved only with relatively high effort.
  • the object of the invention is to provide a protective device of the type described, which allows for less effort high availability of the monitored power system.
  • the supply protection unit and the branch protection unit for communication with each other are connected to a common digital data bus and the feed-protection unit and the branch protection unit are time-synchronized with each other.
  • all protection units provided, in particular, for monitoring and protecting the optionally multiple feeder branches and branches are in a communication connection which is designed, for example, in accordance with the IEC61850 standard. This communication takes place via the particular designed as an Ethernet bus data bus. He is preferably able to cope with the high data volumes occurring in certain operating situations without data congestion.
  • data can also be transmitted on a timely basis, ie in particular within one period of the mains voltage, from one unit connected to the data bus to any other one connected to the data bus.
  • Time-critical data such as a switch-off command, can also be transmitted even faster if required.
  • a real-time function is preferably ensured.
  • the data bus is designed in such a way that the maximum time delays which occur during data transmission via the data bus correspond to those in the protection arrangement
  • Protective functions is adjusted.
  • the data can then be transmitted without congestion.
  • the dimensioning of the data bus depends in particular on the number of connected units and the selected sampling rate.
  • the standard provides for a sampling rate of up to 25 measured values per second at a mains frequency of 50 Hz and a maximum of 30 measured values per second at a nominal frequency of 60 Hz. Higher sampling rates are also possible for future applications.
  • the protection and monitoring functions can be significantly expanded. For example, instead of a complete shutdown of the busbar and dami h sllpr now mncri i nhsn important branches occur when it is detected that the feed branch is overloaded or that there is a risk of overloading there. For this purpose, no intervention of a separate higher-level unit, such as a station unit or a Netzleiststelle required. The partial shutdown can occur solely due to the data exchange between the protection units with each other. This increases the availability of the energy supply system while ensuring high operational reliability. At the same time, existing components can be dispensed with. Thus, a separate station unit as well as - at least to a certain extent - a redundant design of the feed.
  • measured values can be detected synchronously within the entire monitored energy supply system independently of the location of the measuring point.
  • measured values such as current or voltage measured values, irrespective of location • of their recording and initial evaluation are based on a common time base and made available to any other unit for further processing.
  • the feeder protection unit and the feeder protection unit therefore have, in particular, a common time synchronization.
  • a local timer is provided within the energy supply system, which is connected to all relevant units, ie at least to the feed-in protection unit and the branch protection unit, and supplies these units with a uniform time base.
  • the feed-protection unit can preferably have a voltage input for connection of a voltage measuring transducer, which detects an operating voltage applied to the busbar.
  • the voltage measured values thus acquired can also be transmitted to the branch protection units via the data bus. They are therefore available in particular everywhere within the protection arrangement, taking into account the locally measured current measurement values for impedance determination. In particular, it is also possible to carry out fault location determination in the event of a fault, without the need for further voltage measurements in all branches.
  • the supply protection unit is designed to monitor and protect a transformer arranged in the supply branch.
  • it has a data input for data relating to a current state of cooling of the transformer.
  • the information about the current cooling provided in the transformer e.g. Air cooling, increased air cooling by fans, oil cooling or the like. , allows a better assessment of the current load condition and whether an overload is imminent.
  • the data input for this cooling information can either be provided as a physically separately provided data input, for example as a binary input of an optional module, or as part of an already present communication interface, for example the bus interface.
  • the feed-in protection unit fulfills, in addition to the function of the transformer protection, that of a branch reserve protection and is designed as a common structural unit. This reduces the space required and also the number of units to be connected to the data bus.
  • the supply protection unit is connected to a switching element arranged in the feed branch and the branch protection unit is connected to a switching element arranged in the branch, and a switch-off command can also be supplied to the switching elements by means of the data bus and the feed or branch protection unit assigned to the switching element , This can save a higher-level coordinating unit. New switching and protection functions are made possible in the first place.
  • the data bus is designed to transmit current amplitude and phase values of a current flowing in the feed branch or in the branch or of a voltage present there. In this way, a reliable (reserve) busbar protection can be realized without much additional equipment expense.
  • the feeder protection unit and the feeder unit are designed to generate fault records for their respective monitoring area, and the data bus is designed to transmit these fault records. The fault records of a protection unit are then also available to all other protection units for the correct evaluation of a critical operating situation.
  • Their functions are taken over by the anyway required power protection unit. Even without the additional outlay for a station unit, the control center thus receives all the important information about the relevant energy supply system. This ensures a reliable network management.
  • FIG. 1 shows an exemplary embodiment of a protective arrangement with bus-coupled protective units for a power supply system with a busbar, a feed branch and a plurality of branches,
  • FIG. 2 shows an embodiment of a protective device with bus-coupled protection units for a power supply system with a two-part busbar, two feed branches and several branches and
  • FIG 3 shows an exemplary embodiment of a protective arrangement with bus-coupled protective units for a power supply system with a two-part double busbar, two feeder branches and several branches.
  • the power supply system 1 shows an exemplary embodiment of a power supply system 1 with a bus-supported protection arrangement 2.
  • the power supply system 1 embodied as a medium-voltage power supply system in the exemplary embodiment has a single busbar 3, which is fed by means of a feed branch 4 and connects to the four consumers or subdistribution nets not shown in more detail 5.
  • the feed branch 4 comprises a transformer 9 which performs a three-phase transformation of an input high voltage of e.g. 110 kV to an output medium voltage of e.g. 20 kV.
  • the feed branch 4 and all branches 5 to 8 each have a switching element in the form of a circuit breaker 10, 11, 12, 13 and 14, respectively.
  • the transformer 9 and the circuit breaker 10 is associated with a feed-protection unit 15 which monitors and protects the feed branch 4 and partly also other parts of the power supply system 1. If necessary, such as at a detected critical operating condition, the feed-protection unit 15 can issue a switching command to the circuit breaker.
  • the feed protection unit 15 is composed of a first subunit in the form of a Tra ⁇ sformatortiklaces 16 and a second subunit in the form of a reserve protection device 17 together.
  • the transformer protection device 16 protects and monitors primarily the transformer 9, whereas the backup protection device 17 performs a higher-level coordinating protection and monitoring function for the entire power supply system 1.
  • a backup protection for the branches 5 to 8 is realized in addition to other functions which are described in more detail below.
  • the transformer protection device 16 and the reserve protection device 17 are combined to form a single common structural unit. An alternative embodiment with two physically separate units is basically also possible.
  • Each of the branches 5 to 8 and in particular each of the circuit breakers 11 to 14 is in each case associated with a branch protection unit 18, 19, 20 and 21 which monitors and protects the respective one of the branches 5 to 8.
  • a branch protection unit 18, 19, 20 and 21 which monitors and protects the respective one of the branches 5 to 8.
  • an overcurrent protection for the respective branches 5 to 8 is realized.
  • the feeder protection unit 15 and all feeder protection units 18 to 21 are connected to a digital data bus 22, by means of which they can communicate with one another.
  • the protection units 15, 18 to 21 are bus-coupled.
  • the data bus 22 is an Ethernet bus in the exemplary embodiment.
  • the communication interfaces of the supply protection unit 15 and the branch protection units 18 to 21 fulfill the IEC61850 standard.
  • the data bus 22 is also part of the protection arrangement 2, such as the power protection unit 15 and each of the branch protection units 18 to 21.
  • the data bus 22 is connected to a GPS (Global Positioning System) - formation on the data bus 22 feeds. From this time information, each of the protection units 15, 18 to 21 connected to the data bus 22 generates a time base which is thus identical at each point within the protection arrangement 2. All protection units 15, 18 to 21 then have a common (internal) time synchronization. Alternatively, the GPS synchronization can also be integrated as a subassembly in one or more of the protection units 15, 18 to 21.
  • GPS Global Positioning System
  • the feed protection unit 15 and in particular its reserve protection device 17 have a certain coordinating function within the protection arrangement 2.
  • the reserve protection device 17 is connected to a higher-level unit in the form of a network control center 24 in a telecontrol connection.
  • the latter works according to a standard protocol.
  • the protection arrangement 2 is connected to a network control system, also referred to as the SCADA (Supervisory Control and Data Acquisition) system. An otherwise for this teleconference connection provided separate station computer is not required. This reduces the implementation effort.
  • SCADA Supervisory Control and Data Acquisition
  • FIG. 2 shows an exemplary embodiment of a power supply system 25 with a likewise bus-supported protective arrangement 26.
  • the energy supply system 25 has a two-part single-manifold rail 27 with two bus-bar partial sections 28 and 29, which can be detachably connected electrically to one another by means of a busbar circuit breaker 30.
  • Each of the busbar sections 28 and 29 has its own feed and is therefore connected to its own feed branch 31 and 32, respectively.
  • Both feed branches 31 and 32 are constructed substantially the same. They each include a transformer 33 or 34 and a circuit breaker 35 or 36 connected in series therewith.
  • the abbreviations 5 to 8 are broadly arbitrary. concluded. In the exemplary embodiment according to FIG. 2, two of the branches 5 to 8 are connected to each of the busbar subsections 28 and 29.
  • the protection arrangement 26 provided for monitoring and protecting the energy supply installation 25 differs only insignificantly from the protection arrangement 2 according to FIG. 1.
  • the main difference is that each of the entry branches 31 and 32 has its own supply protection unit 37 or 38 assigned to it Feed protection unit 15 are constructed. Accordingly, each of the feed-in protection units 37 and 38 in turn has a transformer protection device 39 or 40 and a backup protection device 41 and 42, respectively.
  • the network control center 24 which is provided only with the feed-in protection unit 37, both are feed-in protection units 37 and 38 built the same.
  • the feeder protection units 37 and 38 and the feeder protection units 18 to 21 are connected to a common digital data bus 43.
  • a time synchronization is also provided.
  • the GPS synchronization unit 23 is also integrated into the protection arrangement 26. It is connected to the data bus 43.
  • protection arrangement 26 can also be applied to medium-voltage power supply systems with two-part double busbars.
  • An exemplary embodiment of such a power supply system 44 with associated protective device 45 is shown in FIG.
  • the power supply system 44 has a double busbar with two parallel busbars 46 and 47, which are each divided into two busbar subsections 48 and 49 or 50 and 51.
  • the busbar sections 48 and 49 or 50 and 51 are in each case by means of a busbar r- r, i eo iAohsr mi grove other connectable. through the bus bar sections 48 to 51 and the feed branches 31 and 32 and the branches 5 to 8 are made. Accordingly, the protection arrangement 45 is extended relative to the protection arrangement 26 by the function of the switching fault protection. Otherwise, there are no significant differences, which is why the components of the protective device 45 are provided with the same reference numerals regardless of the additionally provided switching fault protection function.
  • the protective device 45 also includes a common digital data bus 66 to which the feeder protection units 37 and 38 and the anti-tamper units 18 to 21 are connected.
  • These information transmitted on the data bus 22, 43 or 66 may be, for example, the current measured values detected at different points within the respective energy supply system 1, 25 or 44 and the voltage measured values detected in the feed branch 15 or 31 or 32. These current and voltage measured values are transmitted with their respectively current amplitude and phase values, ie as complex pointer or phasor quantities.
  • the sampling intervals provided between temporally successive current or voltage measured values correspond to the requirements applicable to the various protective functions. Due to the common time synchronization, the measured values each relate to the same time base and are therefore comparable with each other, even if they come from different sources.
  • fault records which have been recorded in one of the protection units 15, 18 to 21 or 37, 38 can also be transmitted on the data bus 22, 43 or 66.
  • the data bus 22, 43 or 66 is also adapted to transmit (off) switching commands for one of the power switches 10 to 14, 35 and 36.
  • This transmission is time-critical and has high priority, since rapid action is required in an error case detected by one of the protection units 15, 18 to 21 or 37, 38 in order to prevent personal injury and / or damage to the equipment.
  • the selection of the turn-off branches 5 to 8 applies the feed-protection unit 15 on the basis of a pre-defined and stored in the feed unit 15 Priori- sation of the branches 5 to 8.
  • the respective load flows in the branches 5 to 8 are taken into account. Active and reactive components of the power consumption in branches 5 to 8 can be determined and taken into account on the basis of the current current and voltage vector quantities available on the data bus 22.
  • the branch protection units 18 to 21 of the branches 5 to 8 to be disconnected recognize that a switch-on command directed to them is pending on the data bus 22. You then arrange the desired
  • a similar selective load shedding is also possible with the energy supply systems 25 and 44 according to FIGS. 2 and 3. Becomes 26 and 45 detects that one of the feeding transformers 33 and 34 is overloaded, this transformer 33 or 34 is turned off. At the same time, as described above, load shedding of individual ones of the branches 5 to 8 can be initiated by the feed-in protection unit 37 or 38 by transmitting turn-off commands via the data bus 43 or 66 to the relevant one of the branch protection units 18 to 21. Thus, a follow-on overload of the second hitherto intact transformer 34 or 33 is prevented and at least a partial operation of the power supply system 25 and 44 maintained.
  • the protection arrangements 2, 26 and 45 allow fault location in the event of a fault, even without each branch protection unit 18 to 21 being connected to voltage transducers.
  • the branch protection units 18 to 21 have only inputs for the connection of current measuring transducers, but no inputs for the connection of voltage transducers. This reduces the acquisition costs.
  • the current operating voltage is determined on the medium-voltage side only once or twice in the feed branch (s) 4 or 31 and 32. Due to the time synchronization, the voltage measured values determined in this way can also be directly related to the current measured values detected at the same time in branches 5 to 8. In particular, it is thus possible to determine impedance values from which, if appropriate, the exact location of the fault can be determined taking account of stored line parameters and fault records recorded in the event of a fault.
  • Protective arrangements 2, 26 and 45 take place.
  • a higher-level unit is not required for this purpose.
  • a part of the tasks otherwise performed by the network control center 24 can be advanced into the protection arrangement 2, 26 or 45.
  • load flow calculations within the protection arrangement 2, 26 or 45 can be carried out or at least prepared to such an extent that the network control center 24 is considerably relieved. This significantly improves the quality and reliability of the power supply.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Ensemble de protection (2) pour la surveillance et la protection d'un système d'alimentation en énergie (1). Ce système d'alimentation en énergie (1) comprend une barre omnibus (3), une branche d'alimentation (4) reliée à la barre omnibus (3) et plusieurs dérivations (5 - 8) reliées à la barre omnibus (3). La branche d'alimentation (4) est pourvue d'une unité (15) de protection pour alimentation et chaque dérivation (5 - 8) est pourvue d'une unité (18 - 21) de protection de dérivation. L'unité (15) de protection pour alimentation et les unités (18 - 21) de protection pour dérivations sont reliées à un bus (22) de données numériques commun pour communiquer entre elles.
PCT/DE2007/000816 2007-05-03 2007-05-03 Ensemble de protection pour un système d'alimentation en énergie, doté d'une barre omnibus, d'une branche d'alimentation et d'une dérivation WO2008134994A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/DE2007/000816 WO2008134994A1 (fr) 2007-05-03 2007-05-03 Ensemble de protection pour un système d'alimentation en énergie, doté d'une barre omnibus, d'une branche d'alimentation et d'une dérivation
DE112007003587T DE112007003587A5 (de) 2007-05-03 2007-05-03 Schutzanordnung für eine Energieversorgungsanlage mit Sammelschiene, Einspeisezweig und Abzweig

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2007/000816 WO2008134994A1 (fr) 2007-05-03 2007-05-03 Ensemble de protection pour un système d'alimentation en énergie, doté d'une barre omnibus, d'une branche d'alimentation et d'une dérivation

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Publication Number Publication Date
WO2008134994A1 true WO2008134994A1 (fr) 2008-11-13

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PCT/DE2007/000816 WO2008134994A1 (fr) 2007-05-03 2007-05-03 Ensemble de protection pour un système d'alimentation en énergie, doté d'une barre omnibus, d'une branche d'alimentation et d'une dérivation

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DE (1) DE112007003587A5 (fr)
WO (1) WO2008134994A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8884467B2 (en) 2011-05-19 2014-11-11 Abb Technology Ag System and method for protecting an electrical power grid
AT15357U1 (de) * 2016-03-10 2017-07-15 VERBUND Solutions GmbH Vorrichtung zur Echtzeiterfassung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0910149A1 (fr) * 1994-02-07 1999-04-21 Kabushiki Kaisha Toshiba Système de relais de protection
EP0948111A2 (fr) * 1998-03-23 1999-10-06 Electric Boat Corporation Dispositif et procédé de protection contre des défauts pour un système d'alimentation d'énergie électrique
WO2000048284A1 (fr) * 1999-02-12 2000-08-17 Alstom T&D Bitronics, Inc. Systeme de protection et de surveillance reparties destine a un reseau d'energie repartie
EP1195876A2 (fr) * 2000-10-06 2002-04-10 Kabushiki Kaisha Toshiba Système de relais digital à protection
WO2002061907A1 (fr) * 2001-01-31 2002-08-08 Alstom Systemes de protection pour reseaux d'energie
EP1276201A2 (fr) * 2001-07-12 2003-01-15 Siemens Aktiengesellschaft Appareil de protection et procédé de protection pour un conducteur
US20040010350A1 (en) * 2000-05-31 2004-01-15 Per-Anders Lof Distributed power generation system protection scheme
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
EP1780858A1 (fr) * 2005-10-31 2007-05-02 ABB Technology AG Dispositif et procédé de protection d'un réseaux de puissance électrique

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0910149A1 (fr) * 1994-02-07 1999-04-21 Kabushiki Kaisha Toshiba Système de relais de protection
EP0948111A2 (fr) * 1998-03-23 1999-10-06 Electric Boat Corporation Dispositif et procédé de protection contre des défauts pour un système d'alimentation d'énergie électrique
WO2000048284A1 (fr) * 1999-02-12 2000-08-17 Alstom T&D Bitronics, Inc. Systeme de protection et de surveillance reparties destine a un reseau d'energie repartie
US20040010350A1 (en) * 2000-05-31 2004-01-15 Per-Anders Lof Distributed power generation system protection scheme
EP1195876A2 (fr) * 2000-10-06 2002-04-10 Kabushiki Kaisha Toshiba Système de relais digital à protection
WO2002061907A1 (fr) * 2001-01-31 2002-08-08 Alstom Systemes de protection pour reseaux d'energie
EP1276201A2 (fr) * 2001-07-12 2003-01-15 Siemens Aktiengesellschaft Appareil de protection et procédé de protection pour un conducteur
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
EP1780858A1 (fr) * 2005-10-31 2007-05-02 ABB Technology AG Dispositif et procédé de protection d'un réseaux de puissance électrique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8884467B2 (en) 2011-05-19 2014-11-11 Abb Technology Ag System and method for protecting an electrical power grid
AT15357U1 (de) * 2016-03-10 2017-07-15 VERBUND Solutions GmbH Vorrichtung zur Echtzeiterfassung

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