WO2010031697A1 - Dispositif de protection d'un appareil électrique à plusieurs phases, sectionneur mécanique et procédé de fonctionnement - Google Patents

Dispositif de protection d'un appareil électrique à plusieurs phases, sectionneur mécanique et procédé de fonctionnement Download PDF

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Publication number
WO2010031697A1
WO2010031697A1 PCT/EP2009/061434 EP2009061434W WO2010031697A1 WO 2010031697 A1 WO2010031697 A1 WO 2010031697A1 EP 2009061434 W EP2009061434 W EP 2009061434W WO 2010031697 A1 WO2010031697 A1 WO 2010031697A1
Authority
WO
WIPO (PCT)
Prior art keywords
firing pin
phases
rocker
phase
overcurrent
Prior art date
Application number
PCT/EP2009/061434
Other languages
German (de)
English (en)
Inventor
Michael Quade
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
Publication of WO2010031697A1 publication Critical patent/WO2010031697A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/122—Automatic release mechanisms with or without manual release actuated by blowing of a fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/0291—Structural association with a current transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/18—Switches operated by change of liquid level or of liquid density, e.g. float switch

Definitions

  • the invention relates to the mechanical separation in liquid-filled transformers, in particular in isolated over a dielectric liquid and cooled transformers.
  • Polyphase electrical equipment such as transformers are often surrounded for isolation with dielectric fluid. This fluid also serves to cool the electrical equipment.
  • a fuse or protection device for the effect of faults on the electrical equipment usually provides first circuit breaker in each strand of a phase.
  • the device which is usually insulated by a housing, is additionally provided with a ground connected to the housing.
  • the electrical faults may not result in a fast shutdown of all phases.
  • Common faults that are not on the electrical side of an electrical device, such as cracking of the housing and leakage of cooling or insulating fluid may result in delays.
  • at least one fuse may remain in the on state, which means that not all phases are mechanically separated.
  • the invention is based on the object of reliably guiding the mechanical separation of all phases of an electrical appliance immersed in dielectric liquid. The solution to this problem is achieved by the respective feature combinations of claims 1, 8 or 9.
  • the invention is based on the finding that a multiphase-operated electrical device insulated in a dielectric fluid can be protected against the effects of errors on the electrical side by mechanical separation of all existing phases by means of a liquid level measurement and an associated firing pin safety device.
  • a leakage monitoring is possible in addition to such liquid monitoring of the dielectric liquid. Since electrical faults which, for example, lead to local overheating in the case of overcurrent, directly cause a lowering of the level of the dielectric fluid, conversely, the monitoring of the fill level can also serve to control electrical faults with substantial overheating.
  • the system Since it is required that all existing phases are separated in the event of a fault, the system is designed in such a way that a triggering due to a lack of liquid level causes a mechanical separation of all phases.
  • the entire system of a multi-phase electric device cooled by dielectric fluid is conventionally provided on the fault detection side with overcurrent firing block fuses per phase, and additionally with a fault-detecting level measurement, which is also connected to a firing pin fuse incorporated in the mechanical area a separation of the phases effected in the same way as the overcurrent controlled firing pin fuses.
  • a sinking of the dielectric fluid, or a decrease in the fluid level which is detected by level measurement, may occur due to leakage, for example due to a crack in the container or due to gas formation during heat development in the interior when an electrical fault occurs. This leads directly to lack of electrical insulation of the electrical device due to lack of liquid, which has too low a cooling result.
  • Essential is the effect that at least one firing pin actuates a common rocker and acts on all pins. This means that each firing pin for itself moves the rocker with ausrechender force or rotate, so that all pins can be eliminated.
  • Liquid-insulated and cooled are, in particular, transformers which are designed in the usual form of three-phase, for example, in a cross or triangular circuit can be carried out, wherein a monitoring of the dielectric liquid is extremely advantageous.
  • the housing of the transformer is preferably grounded.
  • the contact pin itself is spring assisted. If the filling level is too low, the wire is displaced, relieving the lever system, so that each lever is deflected by its spring support and the corresponding firing pin is released.
  • FIG. 1 shows an overview of an open one
  • Container with a three-phase transformer which is protected in all three phases and additionally via a filling safety device,
  • FIG. 2 shows an overcurrent-controlled firing pin safety device, introduced into a holder, consisting of a rocker and an eliminable contact pin
  • FIG. 3 shows a level-controlled firing pin safety device with a float used for level monitoring
  • FIG. 4 shows a detail of a detail from FIG. 1, wherein the assignment of the type of firing pin safety device according to FIG. 2 or FIG. 3 is indicated by arrows.
  • the invention solves problems in oil-cooled transformers characterized, then at least one firing pin fuse, which monitors the level of the dielectric liquid in the container or housing is used.
  • a firing pin of such a level controlled firing pin safety device acts on the same mechanical release system, on all present in one phase firing pin fuses act with their firing pin, if triggered overcurrent controlled.
  • Faults which can occur on transformers are, in particular, internal faults which lie on the electrical side of the corresponding devices. Errors that occur at different locations in the system should basically lead to the mechanical separation of all existing phases. All existing fuses, which are designed as firing pin fuses, or are connected to signal at rest overall, a fault-free operation and thus mechanically not separate phases. If an error detection detects an error, a fuse becomes active and thus the associated firing pin safety device will cause a total separation of all phases.
  • an open container 4 is shown schematically, which is connected to a grounding 6.
  • the liquid 7 also serves for cooling.
  • the transformer 5 shown schematically in Figure 1 is three-phase with the phases 1, 2, 3 designed, each phase is monitored and secured by an overcurrent controlled firing pin fuse 311.
  • at least one level-controlled firing pin safety device is provided for monitoring the system for proper filling with dielectric fluid.
  • FIG. 2 shows in detail an overcurrent-controlled firing pin safety device 311 with a corresponding holder 32, a common spar 37 and a spring-assisted contact pin 33 which is locked in the rest position. Furthermore, the rocker 35 is registered with a schematic positioning relative to the firing pin 38 and the contact pin 33 in a sectional side view.
  • the spring-loaded pin 34 serves to lock the contact pin 33.
  • the contact pin 33 is also spring-biased in the locked position by the compression spring 36.
  • the current path in each phase is indicated by the guide of the electric cable 40, wherein in the central region of the holder 32 and with the Electric cable 40 connected contact pin 33 are interposed.
  • the pressure spring 36 is preferably not flowed through and insulated by means of a dielectric ring 41.
  • the U-shaped bracket 32 receives on one side a firing pin safety device 311 and, on the other hand, in a bore, for example, a grooved pin and thus forms part of the electrical path.
  • a firing pin safety device 311 In the case of triggering the firing pin safety strikes the firing pin against a rotatably mounted rocker 35, which in turn strikes the contact pin 33 from the holder 32. This in turn is spring-assisted by means of the prestressed compression spring 36.
  • At least one spring-loaded firing pin safety device can be actuated in a housing 39.
  • the firing pin 38 is locked by a lever 101.
  • the lever 101 is in turn also locked by a second lever 102.
  • In the housing 39 is a slot in which a wire 111 is slidably disposed. Through the wire, the lever 102 is locked.
  • the wire 111 is fixed to a float 112 at its upper end. If the float sinks due to a reduction in the liquid level within the transformer or its housing, the wire 111 releases the lever 102 after a certain float travel. As a result, the lever 101 is relieved, so that the firing pin 38 is released. This meets the rocker 35, whereby the three pins 33 are knocked out of their brackets 32.
  • FIG. 4 again shows, in a front view, the arrangements of 4 firing pin retainers according to FIG. 1, with details taken from FIGS. 2 and 3, respectively.
  • FIG. 4 in particular the placement of the phases 1, 2, 3 is noted, each with an overcurrent controlled firing pin fuse 311.
  • these are provided with corresponding firing pin firing pin fuses 311 installed, wherein the holder 32 forms part of the current path, a contact pin 33 which, as visible in Figure 2, on the rocker 35 when triggering a firing pin safety device on all three Phases 1, 2, 3 is eliminated.
  • the level-controlled firing pin safety device 312 is schematically positioned. This is additionally installed and does not have to act in a straight line of force on a contact pin 33.
  • the firing pin safety device which can be triggered via a float 112, if the dielectric fluid 7 has too low a level, is equipped with a firing pin 38.
  • This acts on the rocker 35 and presses as well as in the analog operating state in an overcurrent firing pin fuse 311 on the rocker, turns them and beats the pins 33 of all existing in the phases fuses by elimination of the corresponding pins.
  • a protection device is realized based on a level monitoring of the already existing dielectric fluid 7. The advantages result from an extremely simple mechanism, whose function can be ensured over a longer period of time. Overall, an intrinsically safe transformer can be realized.
  • Embodiments of the invention relate to the protection of multi-phase transformers.
  • the invention can be generally applied to multi-phase powered electrical appliances insulated in dielectric fluid.
  • liquid level monitoring for example, leaks can be detected on a container 4 and lead to a mechanical or electrical separation.

Landscapes

  • Housings And Mounting Of Transformers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un dispositif de protection d'un appareil électrique à plusieurs phases, isolé par un liquide diélectrique (7). Chacune des phases (1, 2, 3) possède un fusible à percuteur (311) commandé par surcourant qui répond en cas d'intensité excessive du courant. En cas de déclenchement sur une seule des phases, toutes les phases sont isolées mécaniquement. En outre, il existe un fusible à percuteur (312) commandé par le niveau de remplissage de liquide qui, en cas de chute au-dessous d'une valeur de consigne prédéterminée pour le niveau de remplissage, isole mécaniquement l'ensemble des phases.
PCT/EP2009/061434 2008-09-19 2009-09-04 Dispositif de protection d'un appareil électrique à plusieurs phases, sectionneur mécanique et procédé de fonctionnement WO2010031697A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008047931.4 2008-09-19
DE200810047931 DE102008047931A1 (de) 2008-09-19 2008-09-19 Vorrichtung zur Absicherung eines mehrphasig betriebenen elektrischen Gerätes, mechanischer Trennschalter und Betriebsverfahren

Publications (1)

Publication Number Publication Date
WO2010031697A1 true WO2010031697A1 (fr) 2010-03-25

Family

ID=41138935

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/061434 WO2010031697A1 (fr) 2008-09-19 2009-09-04 Dispositif de protection d'un appareil électrique à plusieurs phases, sectionneur mécanique et procédé de fonctionnement

Country Status (2)

Country Link
DE (1) DE102008047931A1 (fr)
WO (1) WO2010031697A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0800251A1 (fr) * 1996-04-04 1997-10-08 Gec Alsthom T & D Sa Système de protection d'un transformateur de distribution triphasé à isolation dans un diélectrique liquide
EP0817346A1 (fr) * 1996-07-02 1998-01-07 Société Nouvelle Transfix Dispositif de protection contre les effets des défauts internes d'un appareil électrique
FR2759212A1 (fr) * 1997-02-06 1998-08-07 Abb Transmit Oy Coupe-circuit destine a deconnecter un appareil electrique d'un reseau electrique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0800251A1 (fr) * 1996-04-04 1997-10-08 Gec Alsthom T & D Sa Système de protection d'un transformateur de distribution triphasé à isolation dans un diélectrique liquide
EP0817346A1 (fr) * 1996-07-02 1998-01-07 Société Nouvelle Transfix Dispositif de protection contre les effets des défauts internes d'un appareil électrique
FR2759212A1 (fr) * 1997-02-06 1998-08-07 Abb Transmit Oy Coupe-circuit destine a deconnecter un appareil electrique d'un reseau electrique

Also Published As

Publication number Publication date
DE102008047931A1 (de) 2010-04-08

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