EP0411171B1 - Own demand supply for a medium voltage switchgear device - Google Patents

Own demand supply for a medium voltage switchgear device Download PDF

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Publication number
EP0411171B1
EP0411171B1 EP89114115A EP89114115A EP0411171B1 EP 0411171 B1 EP0411171 B1 EP 0411171B1 EP 89114115 A EP89114115 A EP 89114115A EP 89114115 A EP89114115 A EP 89114115A EP 0411171 B1 EP0411171 B1 EP 0411171B1
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EP
European Patent Office
Prior art keywords
voltage
windings
conductor
intermediate transformer
transformers
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Expired - Lifetime
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EP89114115A
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German (de)
French (fr)
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EP0411171A1 (en
Inventor
Erwin Dipl.-Ing. Hartmann (Fh)
Werner Dipl.-Ing. Heiss
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Siemens AG
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Siemens AG
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Application filed by Siemens AG filed Critical Siemens AG
Priority to AT89114115T priority Critical patent/ATE86049T1/en
Priority to ES198989114115T priority patent/ES2040943T3/en
Priority to EP89114115A priority patent/EP0411171B1/en
Priority to DE8989114115T priority patent/DE58903615D1/en
Priority to NO903364A priority patent/NO177445C/en
Publication of EP0411171A1 publication Critical patent/EP0411171A1/en
Application granted granted Critical
Publication of EP0411171B1 publication Critical patent/EP0411171B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • the invention relates to a self-supply for a medium-voltage switchgear.
  • a device for feeding a mercury vapor rectifier in which a main and an additional transformer can be connected to one another via a formation switch.
  • the windings of the two transformers are each connected in star.
  • This device is designed for the application (supply of a mercury vapor rectifier) and requires special transformers. In the event of faults in the three-phase network, the faults are transmitted by the device.
  • the object of the present invention is to provide a self-supply that does not require a separate self-transformer.
  • the voltage converters which are present in each medium-voltage switchgear and which are used for data acquisition and which have a thermal load which is many times higher than that required for data acquisition are used to supply the power supply network.
  • the voltage transformers transmit - fully in the sense of theirs actual task - also faulty states. For example, in the case of a ground fault in a three-phase medium-voltage network, the voltage in one pole is approximately zero, whereas in the two undisturbed poles the voltage increases ⁇ 3 times. This voltage state is not permitted in a self-supply network.
  • the invention provides for an intermediate transformer to be connected to the secondary windings of the voltage converters, the input windings of which are connected in a triangle. Since the vector triangle of the secondary voltages of the voltage transformers is retained on the primary side in the event of an earth fault, the intermediate transformer also has its normal magnetic excitation in this operating case, ie the voltage between the conductors is retained.
  • the output winding of the intermediate transformer is connected in a star or in a zigzag, the star point being earthed in each case. This means that three single-phase voltages and a three-phase system with a fully resilient neutral conductor are available for the switchgear's own grid, in which earth faults in the medium-voltage network have no effect.
  • a personal supply according to claim 2 can advantageously be used both in single-pole encapsulated gas-insulated switchgear and in air-insulated switchgear.
  • an earth fault in the medium-voltage network can also be seen in the case of an own supply according to claim 2.
  • a voltage converter set 2 with its primary windings 211, 221, 231 is connected to the conductors L1, L2, L3 of this medium-voltage network 1.
  • the voltage converter set 2 consists of three single-pole insulated voltage converters 21, 22, 23, the primary windings 211, 221, 231 and the secondary windings 212, 222, 232 of which are each connected to form a star connection with an earthed star point.
  • the secondary windings 212, 222, 232 are connected to input windings 41, 43, 45 of an intermediate transformer 4, the input windings 41, 43, 45 being connected in a triangle.
  • the intermediate transformer 4 is connected with its output windings 42, 44, 46 to the power grid 5 of the medium-voltage switchgear.
  • the output windings 42, 44, 46 are connected in star.
  • the output windings 42, 44, 46 can also be connected in a zigzag.
  • a zigzag connection is advantageous in the event of extreme unbalanced loads, since a zigzag connection results in better load distribution on the individual output windings 42, 44, 46 of the intermediate transformer 4.
  • the self-supply network with any network form can be used for the "protective measures against dangerous body currents" (VDE 0100, part 410, IEC publication 364-4-41 and 364) with the star point -4-47) can be connected, ie the network types IT, TN and TT as well as the permitted combinations.
  • VDE 0100, part 410, IEC publication 364-4-41 and 364 with the star point -4-47
  • the star point of the output windings 42, 44, 46 is grounded and a PEN conductor is brought out for the connection of a TN network.
  • FIG 2 1 also denotes a three-phase medium-voltage network.
  • a voltage converter set 3 with its primary windings 311, 321 is connected to the conductors L1, L2, L3 of this medium-voltage network 1.
  • the voltage converter set 3 consists of two bipolar isolated voltage converters 31, 32 (both poles are fully isolated from earth). Each voltage converter 31, 32 is connected with the one terminal pole of its primary winding 311 or 321 to a conductor L1 or L3 of the medium-voltage network 1; the other connection poles of the primary windings 311, 321 are connected together to the still free conductor L2.
  • the secondary windings 312, 322 of the voltage converters 31, 32 are connected to ground with their one connection pole and connected to an input winding 41 or 45 of the intermediate transformer 4 with their other connection poles.
  • the remaining input winding 43 is connected to the grounded star point of the secondary windings 312, 322 of the voltage converters 31, 32.
  • the circuit design of the intermediate transformer 4 is identical to the structure of the intermediate transformer in FIG. 1 and is already described there.

Abstract

The invention relates to an own demand supply for a medium voltage switching installation. An own demand supply, which has no separate own demand transformer, is obtained by means of a voltage convertor set (2; 3) whose primary windings (211, 221, 231; 311, 321) are connected to a three-phase medium-voltage network and whose secondary windings (212, 222, 232; 312, 322) are connected to input windings (41, 43, 45) of an intermediate transformer (4), the input windings (41, 43, 45) of the intermediate transformer (4) being connected in delta and the output windings (42, 44, 46) of the intermediate transformer (4) being connected in star or in zig-zag, and the own demand network of the medium-voltage switching installation being connected thereto. <IMAGE>

Description

Die Erfindung betrifft eine Eigenbedarfsversorgung für eine Mittelspannungsschaltanlage.The invention relates to a self-supply for a medium-voltage switchgear.

Für die bisher bekannten Eigenbedarfsversorgungen in Mittelspannungsschaltanlagen ist neben einem Eigenbedarf-Transformator auch ein eigenes Schaltfeld notwendig, das einen beträchtlichen Raumbedarf aufweist. In luftisolierten Schaltanlagen wird der Eigenbedarf-Transformator mit einem Lasttrennschalter geschaltet und mit Sicherungen geschützt. In gasisolierten Schaltanlagen, wo zum Schalten des Transformators sogar ein Leistungsschalter erforderlich ist, erfolgt der Schutz mittels Stromwandler und Schutzrelais. Die Stromwandler sind wegen des kleinen Nennstromes der Eigenbedarf-Transformatoren und der trotzdem erforderlichen vollen Kurzschlußfestigkeit besonders teuer.For the previously known own requirements supplies in medium-voltage switchgear, in addition to an own requirement transformer, a separate control panel is required, which requires a considerable amount of space. In air-insulated switchgear, the in-house transformer is switched with a switch disconnector and protected with fuses. In gas-insulated switchgear, where a circuit breaker is even required to switch the transformer, protection is provided by means of current transformers and protective relays. The current transformers are particularly expensive because of the small nominal current of the own-use transformers and the full short-circuit strength required.

Aus der CH-PS 180 181 ist eine Einrichtung zur Speisung eines Quecksilberdampfgleichrichters bekannt, bei der ein Haupt- und ein Zusatztransformator über einen Formationsumschalter miteinander verbindbar sind. Die Wicklungen der beiden Transformatoren sind jeweils in Stern geschaltet. Diese Einrichtung ist auf den Anwendungsfall (Versorgung eines Quecksilberdampfgleichrichters) ausgelegt und benötigt spezielle Transformatoren. Bei Fehlern im Drehstromnetz werden die Fehler durch die Einrichtung übertragen.From CH-PS 180 181 a device for feeding a mercury vapor rectifier is known, in which a main and an additional transformer can be connected to one another via a formation switch. The windings of the two transformers are each connected in star. This device is designed for the application (supply of a mercury vapor rectifier) and requires special transformers. In the event of faults in the three-phase network, the faults are transmitted by the device.

Aufgabe der vorliegenden Erfindung ist es, eine Eigenbedarfsversorgung zu schaffen, die ohne einen gesonderten Eigenbedarf-Transformator auskommt.The object of the present invention is to provide a self-supply that does not require a separate self-transformer.

Die Aufgabe wird erfindungsgemäß durch die im Anspruch angegebenen Merkmale gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen beschrieben.The object is achieved by the features specified in the claim. Advantageous refinements are described in the subclaims.

Bei der erfindungsgemäßen Eigenbedarfsversorgung werden die in jeder Mittelspannungsschaltanlage vorhandenen Spannungswandler, die der Meßwerterfassung dienen und die eine vielfach höhere thermische Belastbarkeit aufweisen als für die Meßwerterfassung erforderlich, zur Speisung des Eigenbedarfsnetzes verwendet. Die Spannungswandler übertragen jedoch - voll im Sinne ihrer eigentlichen Aufgabe - auch fehlerhafte Zustände. So ist z.B. bei Erdschluß in einem dreiphasigen Mittelspannungsnetz in einem Pol die Spannung annähernd gleich Null, wohingegen in den beiden ungestörten Polen die Spannung auf das √3-fache ansteigt. Dieser Spannungszustand ist in einem Eigenbedarfsnetz unzulässig. Damit sich Erdschlüsse des Mittelspannungsnetzes nicht auswirken, ist erfindungsgemäß vorgesehen, an die Sekundärwicklungen der Spannungswandler einen Zwischentransformator anzuschließen, dessen Eingangswicklungen in Dreieck geschaltet sind. Da das Vektor-Dreieck der Sekundärspannungen der Spannungswandler bei Erdschluß auf der Primärseite erhalten bleibt, hat der Zwischentransformator auch in diesem Betriebsfall seine normale magnetische Erregung, d.h. die Spannung zwischen den Leitern bleibt erhalten. Die Ausgangswicklung des Zwischentransformators ist in Stern oder in Zickzack geschaltet, wobei der Sternpunkt jeweils geerdet ist. Damit stehen für das Eigenbedarfsnetz der Schaltanlage sowohl drei einphasige Spannungen als auch ein Drehstromsystem mit voll belastbarem Nulleiter zur Verfügung, in dem sich Erdschlüsse des Mittel spannungsnetzes nicht auswirken.In the self-supply of the invention, the voltage converters which are present in each medium-voltage switchgear and which are used for data acquisition and which have a thermal load which is many times higher than that required for data acquisition are used to supply the power supply network. However, the voltage transformers transmit - fully in the sense of theirs actual task - also faulty states. For example, in the case of a ground fault in a three-phase medium-voltage network, the voltage in one pole is approximately zero, whereas in the two undisturbed poles the voltage increases √3 times. This voltage state is not permitted in a self-supply network. So that earth faults in the medium-voltage network do not have an effect, the invention provides for an intermediate transformer to be connected to the secondary windings of the voltage converters, the input windings of which are connected in a triangle. Since the vector triangle of the secondary voltages of the voltage transformers is retained on the primary side in the event of an earth fault, the intermediate transformer also has its normal magnetic excitation in this operating case, ie the voltage between the conductors is retained. The output winding of the intermediate transformer is connected in a star or in a zigzag, the star point being earthed in each case. This means that three single-phase voltages and a three-phase system with a fully resilient neutral conductor are available for the switchgear's own grid, in which earth faults in the medium-voltage network have no effect.

Eine Eigenbedarfsversorgung gemäß Anspruch 2 ist in vorteilhafter Weise sowohl in einpolig gekapselten gasisolierten Schaltanlagen als auch in luftisolierten Schaltanlagen einsetzbar. Darüber hinaus ist bei einer Eigenbedarfsversorgung nach Anspruch 2 auch ein Erdschluß im Mittelspannungsnetz erkennbar.A personal supply according to claim 2 can advantageously be used both in single-pole encapsulated gas-insulated switchgear and in air-insulated switchgear. In addition, an earth fault in the medium-voltage network can also be seen in the case of an own supply according to claim 2.

Die Erfindung sowie weitere vorteilhafte Ausgestaltungen werden im folgenden anhand von Ausführungsbeispielen näher erläutert. Darin zeigen:

FIG 1
ein Prinzipschaltbild einer ersten Ausführungsform der erfindungsgemäßen Eigenbedarfsversorgung,
FIG 2
ein Prinzipschaltbild einer zweiten Ausführungsform der erfindungsgemäßen Eigenbedarfsversorgung.
The invention and further advantageous embodiments are explained in more detail below on the basis of exemplary embodiments. In it show:
FIG. 1
2 shows a basic circuit diagram of a first embodiment of the personal supply according to the invention,
FIG 2
a schematic diagram of a second embodiment of the personal supply according to the invention.

In FIG 1 ist mit 1 ein dreiphasiges Mittelspannungsnetz bezeichnet. An die Leiter L1,L2,L3 dieses Mittelspannungsnetzes 1 ist ein Spannungswandlersatz 2 mit seinen Primärwicklungen 211,221,231 gelegt. Der Spannungswandlersatz 2 besteht aus drei einpolig isolierten Spannungswandlern 21,22,23, deren Primärwicklungen 211,221,231 und deren Sekundärwicklungen 212,222,232 jeweils zu einer Sternschaltung mit geerdetem Sternpunkt zusammengeschaltet sind. Die Sekundärwicklungen 212,222,232 sind an Eingangswicklungen 41,43,45 eines Zwischentransformators 4 gelegt, wobei die Eingangswicklungen 41,43,45 in Dreieck geschaltet sind. Der Zwischentransformator 4 ist mit seinen Ausgangswicklungen 42,44,46 an das Eigenbedarfsnetz 5 der Mittelspannungsschaltanlage angeschlossen. Die Ausgangswicklungen 42, 44,46 sind in dem in FIG 1 dargestellten Ausführungsbeispiel in Stern geschaltet. Die Ausgangswicklungen 42,44,46 können aber auch in Zickzack geschaltet sein. Eine Zickzackschaltung ist bei extremer Schieflast von Vorteil, da man durch eine Schaltung in Zickzack eine bessere Lastverteilung auf die einzelnen Ausgangswicklungen 42,44,46 des Zwischentransformtators 4 erzielt. Sowohl bei in Dreieck als auch in Zickzack geschalteten Ausgangswicklungen 42,44,46 kann mit dem herausgeführten Sternpunkt das Eigenbedarfsnetz mit beliebiger Netzform betreffend die "Schutzmaßnahmen gegen gefährliche Körperströme" (VDE 0100, Teil 410, IEC-Publikation 364-4-41 und 364-4-47) angeschlossen werden, d.h. die Netzformen IT, TN und TT sowie die erlaubten Kombinationen. In dem in FIG 1 dargestellten Ausführungsbeispiel ist der Sternpunkt der Ausgangswicklungen 42,44,46 geerdet und ein PEN-Leiter für den Anschluß eines TN-Netzes herausgeführt.1 shows a three-phase medium-voltage network. A voltage converter set 2 with its primary windings 211, 221, 231 is connected to the conductors L1, L2, L3 of this medium-voltage network 1. The voltage converter set 2 consists of three single-pole insulated voltage converters 21, 22, 23, the primary windings 211, 221, 231 and the secondary windings 212, 222, 232 of which are each connected to form a star connection with an earthed star point. The secondary windings 212, 222, 232 are connected to input windings 41, 43, 45 of an intermediate transformer 4, the input windings 41, 43, 45 being connected in a triangle. The intermediate transformer 4 is connected with its output windings 42, 44, 46 to the power grid 5 of the medium-voltage switchgear. In the exemplary embodiment shown in FIG. 1, the output windings 42, 44, 46 are connected in star. The output windings 42, 44, 46 can also be connected in a zigzag. A zigzag connection is advantageous in the event of extreme unbalanced loads, since a zigzag connection results in better load distribution on the individual output windings 42, 44, 46 of the intermediate transformer 4. In the case of output windings 42, 44, 46 connected in a triangle as well as in a zigzag, the self-supply network with any network form can be used for the "protective measures against dangerous body currents" (VDE 0100, part 410, IEC publication 364-4-41 and 364) with the star point -4-47) can be connected, ie the network types IT, TN and TT as well as the permitted combinations. In the exemplary embodiment shown in FIG. 1, the star point of the output windings 42, 44, 46 is grounded and a PEN conductor is brought out for the connection of a TN network.

In FIG 2 ist mit 1 ebenfalls ein dreiphasiges Mittelspannungsnetz bezeichnet. An die Leiter L1,L2,L3 dieses Mittelspannungsnetzes 1 ist ein Spannungswandlersatz 3 mit seinen Primärwicklungen 311,321 gelegt. Der Spannungswandlersatz 3 besteht aus zwei zweipolig isolierten Spannungswandlern 31,32 (beide Pole sind gegen Erde voll isoliert). Jeder Spannungswandler 31,32 ist mit dem einen Anschlußpol seiner Primärwicklung 311 bzw. 321 jeweils an einen Leiter L1 bzw.L3 des Mittelspannungsnetzes 1 angeschlossen; die anderen Anschlußpole der Primärwicklungen 311,321 sind gemeinsam an den noch freien Leiter L2 angeschlossen.In FIG 2, 1 also denotes a three-phase medium-voltage network. A voltage converter set 3 with its primary windings 311, 321 is connected to the conductors L1, L2, L3 of this medium-voltage network 1. The voltage converter set 3 consists of two bipolar isolated voltage converters 31, 32 (both poles are fully isolated from earth). Each voltage converter 31, 32 is connected with the one terminal pole of its primary winding 311 or 321 to a conductor L1 or L3 of the medium-voltage network 1; the other connection poles of the primary windings 311, 321 are connected together to the still free conductor L2.

Die Sekundärwicklungen 312,322 der Spannungswandler 31,32 sind mit ihren einen Anschlußpolen gemeinsam an Erde gelegt und mit ihren anderen Anschlußpolen jeweils mit einer Eingangswicklung 41 bzw. 45 des Zwischentransformators 4 verbunden. Die verbleibende Eingangswicklung 43 ist an den geerdeten Sternpunkt der Sekundärwicklungen 312,322 der Spannungswandler 31,32 angeschlossen. Der schaltungstechnische Aufbau des Zwischentransformators 4 ist mit dem Aufbau des Zwischentransformators in FIG 1 identisch und ist bereits dort beschrieben.The secondary windings 312, 322 of the voltage converters 31, 32 are connected to ground with their one connection pole and connected to an input winding 41 or 45 of the intermediate transformer 4 with their other connection poles. The remaining input winding 43 is connected to the grounded star point of the secondary windings 312, 322 of the voltage converters 31, 32. The circuit design of the intermediate transformer 4 is identical to the structure of the intermediate transformer in FIG. 1 and is already described there.

Claims (6)

  1. Power supply for operation of a medium-voltage switching installation having the following features:
    - a set of voltage transformers (2;3) is applied with its primary windings (211,221,231;311,321) to a three-phase medium-voltage network (1) and is connected by its secondary windings (212,222,232;312,322) to input windings (41,43,45) of an intermediate transformer (4),
    - the input windings (41,43,45) of the intermediate transformer (4) are connected in delta,
    - the output windings (42,44,46) of the intermediate transformer (4) are star-connected or zigzag-connected and the specific-requirement network of the medium-voltage switching installation is attached thereto.
  2. Power supply according to claim 1, in which the set of voltage transformers (2) consists of three voltage transformers (21,22,23) insulated on one pole, the primary windings (211,221,231) of which and the secondary windings (212,222,232) of which are in each case star-connected and both star points are earthed.
  3. Power supply according to claim 1, having the following features:
    - the set of voltage transformers (3) consists of two voltage transformers (31,32) insulated on two poles,
    - each voltage transformer (31,32) is connected by the one terminal pole of its primary winding (311;321) in each case to a conductor (L1;L3) of the three-phase medium-voltage network (1), the other terminal poles of the primary windings (311,321) are together connected to the conductor (L2) which is still free,
    - the secondary windings (321,322) of the voltage transformers (31,32) are applied together to earth by their one set of terminal poles and are connected by their other set of terminal poles in each case to an input winding (41;45) of the intermediate transformer (4), the further input winding (43) of which is connected to the earthed star point of the secondary windings (312,322) of the voltage transformers (31,32).
  4. Power supply according to claim 2, in which the voltage transformers (21,22,23) insulated on one pole are designed for a secondary nominal voltage (conductor-earth-voltage) of 100/√3 V and the intermediate transformer (4) is designed for an input voltage (conductor-conductor-voltage) of 100 V.
  5. Power supply according to claim 2, in which the voltage transformers (21,22,23) insulated on one pole are designed for a secondary nominal voltage (conductor-earth-voltage) of 220 V and the intermediate transformer (4) is designed for an input voltage (conductor-conductor-voltage) of 380 V.
  6. Power supply according to one or more of the preceding claims, in which the output windings (42,44,46) of the intermediate transformer (4) are designed in each case for an output voltage (conductor-earth-voltage/conductor-conductor-voltage) of 220/380 V.
EP89114115A 1989-07-31 1989-07-31 Own demand supply for a medium voltage switchgear device Expired - Lifetime EP0411171B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT89114115T ATE86049T1 (en) 1989-07-31 1989-07-31 OWN SUPPLY FOR A MEDIUM VOLTAGE SWITCHGEAR.
ES198989114115T ES2040943T3 (en) 1989-07-31 1989-07-31 SUPPLY OF OWN CONSUMPTION FOR A MEDIUM VOLTAGE CONNECTION INSTALLATION.
EP89114115A EP0411171B1 (en) 1989-07-31 1989-07-31 Own demand supply for a medium voltage switchgear device
DE8989114115T DE58903615D1 (en) 1989-07-31 1989-07-31 SELF-REQUIRED SUPPLY FOR A MEDIUM VOLTAGE SWITCHGEAR.
NO903364A NO177445C (en) 1989-07-31 1990-07-30 Self-supply in medium-voltage apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89114115A EP0411171B1 (en) 1989-07-31 1989-07-31 Own demand supply for a medium voltage switchgear device

Publications (2)

Publication Number Publication Date
EP0411171A1 EP0411171A1 (en) 1991-02-06
EP0411171B1 true EP0411171B1 (en) 1993-02-24

Family

ID=8201697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114115A Expired - Lifetime EP0411171B1 (en) 1989-07-31 1989-07-31 Own demand supply for a medium voltage switchgear device

Country Status (5)

Country Link
EP (1) EP0411171B1 (en)
AT (1) ATE86049T1 (en)
DE (1) DE58903615D1 (en)
ES (1) ES2040943T3 (en)
NO (1) NO177445C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105896783B (en) * 2016-05-20 2018-05-29 杨建华 A kind of dual power supply motor for single-phase 220V and two-phase 380V

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH180181A (en) * 1934-11-27 1935-10-15 Oerlikon Maschf Device for feeding a mercury vapor rectifier with p.n anodes through a main transformer with an n-phase secondary winding and with p anodes working in parallel per phase.
CH234652A (en) * 1942-03-28 1944-10-15 Licentia Gmbh Large multi-phase transformer consisting of single-phase transformers.

Also Published As

Publication number Publication date
ATE86049T1 (en) 1993-03-15
DE58903615D1 (en) 1993-04-01
EP0411171A1 (en) 1991-02-06
ES2040943T3 (en) 1993-11-01
NO903364L (en) 1991-02-01
NO903364D0 (en) 1990-07-30
NO177445C (en) 1995-09-13
NO177445B (en) 1995-06-06

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