EP3417468A1 - Schaltanlagenanordnung, umrichteranordnung mit schaltanlagenanordnung und verfahren zum schutz der umrichteranordnung - Google Patents
Schaltanlagenanordnung, umrichteranordnung mit schaltanlagenanordnung und verfahren zum schutz der umrichteranordnungInfo
- Publication number
- EP3417468A1 EP3417468A1 EP16710145.0A EP16710145A EP3417468A1 EP 3417468 A1 EP3417468 A1 EP 3417468A1 EP 16710145 A EP16710145 A EP 16710145A EP 3417468 A1 EP3417468 A1 EP 3417468A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- transformer
- circuit breaker
- low
- converter
- 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.)
- Granted
Links
Classifications
-
- 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
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
- H01H33/121—Load break switches
- H01H33/125—Load break switches comprising a separate circuit breaker
-
- 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
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
Definitions
- Switchgear arrangement converter arrangement with switchgear arrangement and method for protecting the converter arrangement
- the invention relates to a switchgear arrangement, comprising a first branch, which connects a first electrical system with egg ⁇ ner second electrical system and at least one series circuit of a first circuit breaker and a first th circuit breaker has.
- Such switchgear assemblies are commonly used in electrical supply networks for the separable connection of several electrical systems.
- the supply network can be, for example, a multi-phase AC voltage network.
- the electrical equipment may be high voltage equipment such as converters, power transformers ⁇ or the like, for example.
- the object of the invention is to propose a kind Heidelberganla ⁇ genan extract that is as reliable as possible.
- the object is achieved in an artful switchgear arrangement by an electrical coupling device, which is set up for potential equalization between a first potential point between the first circuit breaker and the first power switch and a second potential point in the switchgear assembly for a voltage-free switching of the first circuit breaker.
- the circuit breaker is energized or de-energized when it is connected without clamping ⁇ voltage via the isolating distance.
- the first separation switch are first geöff- net.
- Arc can occur in such a case when closing the circuit breaker.
- the coupling device By means of the coupling device, it is now advantageously possible to achieve potential equalization on both sides of the circuit breaker. In this way, occurring after opening, for example, the first circuit breaker occurring parasi ⁇ tary earth capacitance with a defined potential.
- the corresponding line portions upstream and downstream of the circuit breaker comprise at existing electrical connection through the coupling is approximately the same voltage, so that the first disconnectors energized or na ⁇ hezu-energized, that is connected without voltage across the separation ⁇ range, are therefore opened or closed can.
- the second potential point is arranged between the first circuit breaker and the disconnector-side system. That way you can Both contacts of the circuit breaker are brought to almost the same electric ⁇ potential.
- the switchgear assembly further comprises a second branch which connects the first system to a third system and min ⁇ least one series circuit of a second circuit breaker and a second circuit breaker, wherein the first and the second branch in a parallel circuit to each other are arranged.
- the first and the second branch are electrically coupled to each other by means of a coupling device, so that a potential equalization between a first potential point between the first circuit breaker and the first circuit breaker and a second potential point between the second circuit breaker and the second circuit breaker can be achieved.
- the equipotential bonding is made possible by an electrical connection between two parallel branches of the switchgear arrangement. In this case, the advantage of the invention for interrupting the connections between the first and the second plant and between the first and the third plant can be achieved.
- the coupling device comprises a first coupling transformer and a second coupling transformer and a line connecting the two coupling transformers.
- the voltage on the side of the first coupling transformer is preferred here again higher voltage level transformed by means of the first coupling transformer on niedri- geres voltage level and by the second Koppeltransfor ⁇ mators (or vice versa). In this way, is a technically simple hither ⁇ vice end and controlling electrical coupling inconveniencege ⁇ provides.
- the first and the second coupling transformer are preferably Power Voltage Transformers. More preferably, the coupling transformers are connected via a capacitor.
- the capacitor can be arranged in the line between the two coupling transformers.
- the line comprises one or more switches for interrupting the line.
- the switch which is for example a switch-disconnector, the line can be safely interrupted.
- the switch may be, for example, a motorized low-voltage circuit breaker.
- a particularly suitable application is the switchgear ⁇ arrangement in connection with the inverter assembly described below.
- the invention relates in this context a
- Inverter arrangement with a converter Inverter arrangement with a converter.
- Such a converter arrangement is known for example from WO 2012/103936 AI.
- the converter arrangement is usually used to convert a DC voltage into an AC voltage or vice versa.
- on the inverter between a DC side and a change ⁇ pannungsseite arranged current valves.
- the inverter can be connected to a DC voltage line or a DC voltage network.
- the inverter can be connected to an AC voltage network.
- Inverter arrangement is a so-called modular multi-stage converter (MMC).
- MMC modular multi-stage converter
- the connection of the converter to the AC voltage network is usually via a transformer.
- a primary winding of the transformer is with the AC side of the inverter and a secondary winding of the transformer with the AC voltage network connectable.
- the object of the invention is to propose a converter arrangement which is as reliable as possible.
- the order ⁇ converters of the converter is the alternating voltage side connected to ei ⁇ ner transformer parallel circuit separable, wherein the transformer parallel circuit comprising a first transformer branch connecting the inverter with a primary winding of a first transformer and a Rei ⁇ henscnies of a first Circuit breaker and a first circuit breaker comprises, and a second transformer branch parallel to the first transformer branch, which connects the inverter to a primary winding of a second transformer and comprises a series circuit of a two ⁇ th circuit breaker and a second circuit breaker, wherein the first and the second Transformer branch can be connected to each other by means of a low-voltage connection, wherein the low-voltage connection with a first potential point between the first circuit breaker and the first circuit breaker second potential point between the second circuit breaker and the second power switch connects. According to their function, the low-voltage connection therefore corresponds to the coupling device.
- the AC side of the Umrich ⁇ ters via two parallel-connected transformers with the AC voltage network is connectable.
- This has several advantages over connecting through a single transformer. Due to the use of two transformers, a redundancy of the system is created. The transmission of electrical power can be continued if one of the transformers Trans ⁇ therefore, the connection between the inverter and the faulty transformer is disconnected. This increases the reliability of the converter arrangement. moreover If one of the transformers is required maintenance, it can be disconnected from the inverter, making maintenance easier. Overall, the reliability of the power transmission can also be increased in this way by means of the converter arrangement according to the invention. Furthermore, due to the transmission of the power in parallel via two transformers, the size of the first and the second transformer can be chosen to be relatively small. This reduces the cost of the inverter assembly.
- connection of the converter to the first and the second transformer is carried out in each case via a series circuit of a circuit breaker and a separation scarf ⁇ age .
- the transformer branches each comprise three phase legs
- ver ⁇ adds each of the phase legs of a corresponding series of ⁇ circuit breakers and disconnectors.
- the first Leis ⁇ tung switch occurring parasitic earth capacitance can for example be driven with a defined potential after opening.
- the corresponding line sections between the switches have at best ⁇ budding electrical communication via the low-voltage link is approximately the same voltage, so that the first disconnectors almost energized, switched without voltage across the isolating distance, Ge ie opened or concluded may be.
- the above-described damage to the converter can thus be avoided and the reliability of the entire converter arrangement can be increased. Any errors that may arise through corresponding operations when connecting one of the transformers can also be avoided in this way.
- any suitable circuit breaker such as a mechanical disconnector or disconnector with a motor drive.
- any suitable AC power switch such as a gas-insulated switchgear (GIS)
- GIS gas-insulated switchgear
- low voltage is understood in the context of the present invention, a voltage of less than 1 kV.
- the configuration of the converter of the converter arrangement is fundamentally arbitrary.
- the converter may, for example, be a line-commutated converter known to the person skilled in the art, in which thyristor valves are used, or a self-commutated converter, which is likewise known to the person skilled in the art, having a voltage intermediate circuit or an MMC.
- said transformer branches are each formed multiphase, the converter arrangement comprising a plurality of low-voltage connections, each of which of each phase to one-one ⁇ sorted.
- each phase of the transformer branches ⁇ branches its own series connection, each with a power ⁇ switch and a circuit breaker, the potential points between the circuit breaker and disconnector of each of the phases with them uniquely associated corresponding potential points in phases of the other transformer branch can be connected by means of its own low-voltage connection
- the low-voltage connection preferably comprises a first and a second voltage converter and a low-voltage line connecting the two voltage transformers. Therefore the first voltage transformer is assigned to the first transformer branch and the second voltage converter is assigned to the second transformer branch .
- the two transformer branches are designed multi-phase.
- the voltage on the side of the first transformer branch is in this case again at high voltage transformed by means of first clamping ⁇ voltage transducer on the low voltage and by said second voltage converter (or vice versa).
- first clamping ⁇ voltage transducer on the low voltage and by said second voltage converter (or vice versa).
- the first and second voltage transformers are Power Voltage Transformers (PVT).
- PVT Power Voltage Transformers
- Such voltage transformers are especially designed and suitable for higher powers.
- PVT can be used in a gas-insulated version.
- the rated power of the PVT may suitably be more than 100 kVA.
- the low-voltage connection comprises a measuring device for detecting the current in the low-voltage line.
- the measuring device serves to monitor and protect components of the converter arrangement, for example a short-circuit current monitoring in the low-voltage connection.
- the measuring device may comprise one or more transducers.
- the low-voltage connection to a low-voltage capacitor may be disposed in the low voltage line between the two voltage transformers.
- the low-voltage capacitor can advantageously occur at the voltage transformers
- the low-voltage connection comprises a surge arrester, which is arranged in a parallel connection to the low-voltage capacitor.
- the surge arrester is a protection of the low voltage capacitor when overvoltages at the low voltage ⁇ capacitor in the case of a ground fault in the low voltage line.
- the surge arrester may be, for example, a metal oxide varistor.
- the low-voltage connection preferably has a discharge resistor.
- Discharge resistor arranged in a parallel circuit to the low-voltage capacitor.
- the discharge resistor serves as ⁇ safe to discharge the low-voltage capacitor after an interruption of the low-voltage connection. In this way, therefore, for example, an additional person ⁇ protection is provided when working on the low-voltage capacitor.
- Discharge resistance between 2 kQ and 50 kH, more preferably between 5 kQ and 30 kQ.
- the low-voltage connection comprises at least one switch-disconnector for interrupting the low-voltage connection.
- the low-voltage connection can be reliably interrupted by means of the switch-disconnector.
- a suitable contactor can also be used.
- the switch-disconnector has the advantage that it generally requires no permanent supply voltage.
- the switch-disconnector can, for example, be a low-voltage motorized
- each of the three phase lines of the low-voltage connection expediently has one or more switch-disconnectors.
- a starting resistor is provided, which is arranged in the low-voltage line.
- the on-resistance is arranged between the two voltage transformers and can be bridged by means of a bridging device.
- the on-resistance is intended to minimize the risk of unfavorable saturation of one of the voltage transformers, which may occur when the low-voltage connection is switched on, if it is performed at an unfavorable phase position of the voltage, for example, when the voltage transformer is energized at a voltage zero crossing becomes.
- the resistor is expediently bridged after a certain time after connecting the low-voltage connection by means of the bridging device.
- the low-voltage line is grounded unipolar.
- the ground made a defined potential in the Niederschreibsver- connection before ⁇ geous. If the low-voltage connection comprises three phases, all three phase lines are expediently grounded in one pole.
- the invention further relates to a method for protecting a converter arrangement with a converter which is connected on the AC side with a transformer parallel circuit, wherein the transformer parallel circuit comprises a first transformer branch which connects the inverter with a pri ⁇ märwicklung a first transformer and a series circuit of a first Circuit breaker and a first power switch, and having a first transformer branch parallel to the second transformer branch, which connects the inverter to a primary winding of a second transformer and comprises a series circuit of a second circuit breaker and a second circuit breaker.
- the invention is to provide a sol ⁇ ches method of damage
- Inverter arrangement when switching on or off one of the two transformers to avoid possible.
- the object is achieved by a method in which a potential equalization between a first potential point between the first circuit breaker and the first power switch and a second potential point between the second circuit breaker and the second circuit breaker is made by the two potential points by means of a low-voltage connection before switching of the first circuit breaker or the second circuit breaker are electrically connected together.
- Described converter arrangement a potential equalization between the two transformer branches is achieved by the inventive method, whereby the ignition of arcs in the opening or closing circuit breaker is avoided due to the Erdkapazticianen.
- the shutdown of one of the Trans ⁇ formators can be performed as follows.
- the two transformers are in an operating state in which both circuit breakers and both disconnectors are closed.
- the first power switch and the first disconnect switch are closed, so that there is an electrical connection between the first transformer and the converter.
- the second circuit breaker and the second disconnector are open. If the second transformer are supplied ⁇ on, so one can proceed as follows. First of all, an equipotential bonding between the potential points between the switches in the transformer branches is established by means of the low-voltage connection. Then, for example, with a time delay, for example, a delay of 1 s, the second disconnect switch is closed. Subsequently, the second power switch is also closed, so that the electrical connection between the second transformer and the inverter is made.
- FIG. 1 shows a first embodiment of a switchgear assembly OF INVENTION ⁇ to the invention in a schematic representation
- FIG. 2 shows a second embodiment of a switchgear assembly OF INVENTION ⁇ to the invention in a schematic representation
- FIG. 3 shows an exemplary embodiment of a converter arrangement according to the invention in a schematic representation.
- a switchgear arrangement 200 is shown in FIG.
- the switchgear assembly 200 connects a first electrical system 101 via a three-phase change ⁇ pannungs effet 4 with a second electrical system 102nd
- the switchgear assembly 200 includes a first branch 51 having a series connection of a first power switch 81 and a first disconnect switch 91.
- the power switch 81 and the disconnect switch 91 can each be controlled by means of a controller not shown graphically in FIG. In the three-phase version of the
- Switchgear assemblies 200 are disposed in each phase of the first branch 51 according to the circuit breakers and disconnectors shown.
- the switchgear assembly 200 further comprises a coupling device 104.
- the coupling device 104 comprises a line 15 which extends between a potential point 41 between the first power switch 81 and the first disconnect switch 91 and a potential point 421 between the first disconnect switch 91 and the disconnector-side, first contactor 101 extends.
- each phase line comprises an own Lei ⁇ processing according to the structure of the cable 15th
- the coupling device 104 comprises a first coupling transformer 11 and a second coupling transformer 12, which are set up for the transformation from a higher voltage level to a lower voltage level (or vice versa).
- the line 15 can be interrupted by means of a switch 18.
- a capacitor 25 is provided.
- the first disconnect switch 91 When the first disconnect switch 91 is to be opened or closed, the first potential point 41 and the second potential point 421 are electrically coupled to each other by closing the switch 18. In this way, an equipotential bonding is generated on both sides of the first circuit breaker 91, whereby the first circuit breaker 91 almost without voltage, ie geöff ⁇ net without voltage across the separation line or can be closed.
- FIG. 2 shows a switchgear arrangement 100.
- the switchgear arrangement 100 connects a first electrical installation 101 via a three-phase alternating current line 4 to a second electrical installation 102 and a third electrical installation 103.
- the switchgear arrangement 100 comprises a first branch 51 and a second branch 52 parallel to the first branch 51
- Branch 51 has a series connection of a first power switch 81 and a first disconnect switch 91.
- the two ⁇ th branch to a series circuit of a second power switch 82 and a second disconnect switch 92nd
- the circuit breakers 81, 82 and the circuit breakers 91, 92 can each be controlled by means of a graphically not shown in the figure 2 ⁇ th controller.
- the three-phase design of the switchgear assembly 100 are arranged in each phase of the two branches 51, 52 according to the power switch and disconnector shown ⁇ .
- the switchgear assembly 100 further includes a coupling device 104.
- the coupling device 104 includes a line 15 extending between a potential point 41 between the first power switch 81 and the first disconnect switch 91 and a potential point 42 between the second power switch 82 and the second disconnect switch 92.
- each phase line comprises its own line corresponding to the structure of the line 15.
- the coupling device 104 comprises a first coupling transformer 11 and a second coupling transformer 12, which are set up for the transformation from a higher voltage level to a lower voltage level (or vice versa).
- the line 15 can be interrupted by means of a switch 18. To compensate for leakage reactances of the two coupling transformers 11 and 12, a capacitor 25 is provided.
- FIG. 3 shows a converter arrangement 1. Identical and identical components in FIGS. 1, 2 and 3 are provided with the same reference numerals.
- the inverter assembly 1 includes an inverter 2 for converting electric power.
- the inverter 2 has a DC side 21 for locking bind ⁇ 3 with a two-pole DC voltage line 2 Further, the converter has an alternating voltage side 22, which is adapted for connection to a three-phase alternating voltage line.
- the AC line 4 connects the inverter 2 with a transformer parallel circuit 5.
- the transformer parallel circuit 5 includes a first transformer branch 51 and a second transformer branch 52, which are connected in parallel with each other.
- the first Trans ⁇ formatorzweig 51 connects the converter 2 with a primary winding 61 of a first transformer ⁇ 6.
- the second Trans ⁇ formatorzweig 52 connects the converter 2 with a primary winding 71 of second transformer 7.
- a secondary winding 62 of first transformer 6 and ⁇ a secondary winding 72 of the second transformer 7 are respectively connected to ei ⁇ nem alternating voltage network 28th
- the two primary windings Lungs 61, 71 are realized in the embodiment shown as three ⁇ eckwicklungen.
- the two secondary windings 62, 72 are realized as star windings.
- the first transformer branch 51 has a series connection of a first power switch 81 and a first disconnect switch 91. Accordingly, the second transformer ⁇ branch 52 a series circuit of a second power switch 82 and a second disconnect switch 92.
- the performance-switches 81, 82 and the disconnecting switches 91, 92 can be driven in each case by means of a not graphically dargestell ⁇ th in the Figure 3 control. It should be noted that the representation of FIG. 3 explicitly shows only one of the three phases of the AC voltage line 4. In the three-phase version of the converter arrangement 1, the circuit breaker and disconnector shown are arranged in each phase in correspondence with each other.
- the converter arrangement 1 further comprises a low-voltage connection 10.
- the low-voltage connection 10 extends between a potential point 41 between the first power switch 81 and the first disconnecting switch 91 and a potential point 42 between the second power switch 82 and the second disconnecting switch 92.
- the low-voltage connection 10 corresponds in its function to the coupling device 104 from FIGS. 1 and 2.
- the low-voltage connection 10 comprises a first voltage converter 11 and a second voltage converter 12, which are set up to transform high voltage into low voltage (or vice versa).
- the current on the low voltage side of the voltage transformers 11, 12 is monitored by means of measuring devices 13 and 14. Between the first voltage converter 11 and the second voltage converter 12 extends a low-voltage line 15.
- the low-voltage line 15 has a first grounding device 16 and a second grounding device 17. By means of the two grounding devices 16 and 17, the low-voltage line 15 can be grounded in one pole.
- the low-voltage connection 10 can be separated by means of a first switch-disconnector 18 and a second switch-disconnector 19 by interrupting the low-voltage line 15.
- the low-voltage connection 10 further includes a bridging resistor 24 which can be bridged by means of a bridging device 23.
- a low-voltage capacitance 25 is provided.
- a discharge resistor 26 is arranged, which is incorporated ⁇ directed to kon ⁇ trolled discharge of the low voltage capacity 25th
- the low-voltage capacitor 25 is a
- the first circuit breaker 81 and the first circuit breaker 91 are closed.
- the second circuit breaker 82, the second circuit breaker 92 and the two load-break switches 18 and 19, however, are open.
- the electrical connection between the second transformer 7 and the inverter 2 is to be produced.
- a potential balance between the potential of points 41 and 42 by closing the switch disconnector is prepared 18 and 19 first by means of the low-tension voltage ⁇ compound 10th Thereafter, the second disconnect switch 92 is closed.
- the second circuit breaker 82 is also closed, whereby the electrical connec ⁇ tion between the second transformer 7 and the inverter 2 is made.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2016/055333 WO2017152999A1 (de) | 2016-03-11 | 2016-03-11 | Schaltanlagenanordnung, umrichteranordnung mit schaltanlagenanordnung und verfahren zum schutz der umrichteranordnung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3417468A1 true EP3417468A1 (de) | 2018-12-26 |
| EP3417468B1 EP3417468B1 (de) | 2020-11-18 |
Family
ID=55538213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16710145.0A Active EP3417468B1 (de) | 2016-03-11 | 2016-03-11 | Schaltanlagenanordnung, umrichteranordnung mit schaltanlagenanordnung und verfahren zum schutz der umrichteranordnung |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3417468B1 (de) |
| WO (1) | WO2017152999A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE517814C2 (sv) * | 1999-11-18 | 2002-07-16 | Abb Ab | Elektrisk kopplare, användning av en kopplare, anläggning för ett flerfasnät, ställverk och förfarande för brytning av en strömväg |
| US20130308235A1 (en) | 2011-02-01 | 2013-11-21 | Siemens Aktiengesellschaft | Method for eliminating a fault on a high-voltage dc line, system for transmitting an electric current via a high-voltage dc line, and converter |
| DE102014008706A1 (de) * | 2014-06-18 | 2015-12-24 | Ellenberger & Poensgen Gmbh | Trennschalter zur Gleichstromunterbrechung |
-
2016
- 2016-03-11 WO PCT/EP2016/055333 patent/WO2017152999A1/de not_active Ceased
- 2016-03-11 EP EP16710145.0A patent/EP3417468B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3417468B1 (de) | 2020-11-18 |
| WO2017152999A1 (de) | 2017-09-14 |
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