EP0980086A1 - Schutzeinrichtung gegen die thermische Überlastung einer Schaltanlage - Google Patents
Schutzeinrichtung gegen die thermische Überlastung einer Schaltanlage Download PDFInfo
- Publication number
- EP0980086A1 EP0980086A1 EP99112165A EP99112165A EP0980086A1 EP 0980086 A1 EP0980086 A1 EP 0980086A1 EP 99112165 A EP99112165 A EP 99112165A EP 99112165 A EP99112165 A EP 99112165A EP 0980086 A1 EP0980086 A1 EP 0980086A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuse
- transformer
- chamber
- protective device
- voltage
- 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
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Classifications
-
- 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
- H01H85/46—Circuit arrangements not adapted to a particular application of the protective device
-
- 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
Definitions
- the invention relates to a protective device against the thermal overload of the Fuse chamber of a switchgear with a downstream transformer, for example to supply a low voltage field, one in the fuse chamber High-voltage high-performance fuse with a tripping device for switching a Transformer switch with free trip is arranged.
- HV fuse The basic task of a high-voltage high-performance fuse, in the following HV fuse called, consists in a short-circuit current in the transformer Bring fuse element to melt, so that the transformer against the most dangerous Consequences of an internal short circuit is protected, for example against the explosion an oil-filled kettle with fire sequence and the like.
- fuses with a stroke detector have been developed so that even in the event of overcurrents, without causing a short circuit in the transformer, by triggering the To open a transformer switch.
- the transformer switch can only switch relatively small currents, for example up to 400 A, while the HV HRC fuse is actually designed for large currents up to 50,000 A, for example. This large currents are not controlled by the transformer switch, so that Sectional fuses the transformer switch for the smaller currents and the Use a fuse for the short-circuit currents.
- Such HV fuses with blow detectors are but has various disadvantages. For example, they can be relatively small Bronze not turn off or not shut off quickly enough, so that overheating and Thermal overload of the fuse box of a switchgear is not always reliable can be avoided.
- the nominal current of a fuse is often chosen so that it corresponds to twice or three times the nominal transformer current. Such large current values must not flow through the transformer permanently. In practice, the network management often prevents the transformer from carrying significant overcurrents, for example so that it does not become excessively hot. Such a high and impermissible current value is below the fuse's nominal current value. The latter is therefore not achieved in practice, so that a protective device cannot be effective for this range of current values.
- the current range between the nominal fuse current and the minimum breaking current I min in known fuses is of no interest to the invention.
- the fuse resistance R of a fuse may increase due to special operating conditions. This can endanger the fuse, even with normal transformer operating currents, for example if individual partial fusible conductors are destroyed from the main fuse element, which is made up of several partial conductors, fused conductor elements running in parallel. If individual fuse elements are successively destroyed, the heat output P a of the fuse, ie the power loss of the fuse, can reach a critical value at very low currents, which is greater than the power consumption of the fuse chamber. As a result, the fuse chamber is thermally overloaded.
- the HV fuse with the release device is designed such that the latter opens the transformer switch at the latest when its permissible power consumption value of the fuse chamber is exceeded via its release voltage U a .
- These measures enable the transformer switch to be opened independently of the operating current, even with a low operating current, ie in extreme cases even below the nominal transformer current value. It is always triggered before and at the latest when the predetermined permissible power consumption value of the fuse chamber is exceeded.
- the triggering according to the invention also takes place, for example, at values far below the fuse rated current I rated . Given the considerable heat output from very small currents below the nominal fuse current value, which can arise if individual fuse elements of the fuse are defective, the fuse chamber must be destroyed, and the new protective device according to the invention prevents thermal overloading of the fuse chamber.
- the power output value of the fuse link is set to an allowable, maximum value set below the power consumption value of the fuse chamber and must not be crossed, be exceeded, be passed. If, for example, the inside of a current-carrying fuse element If the power output is too great, the fuse chamber heats up and can be thermally overloaded if the permissible power consumption value is exceeded.
- the trigger voltage at the latest Exceeding a permissible power output value of the fuse is reached.
- the maximum power output value is reached when the power consumption of the Security chamber is exceeded. As long as the power output of the fuse maximum power consumption of the fuse chamber does not exist for the switchgear no danger.
- the maximum power consumption is determined by the specified manufacturer of the switchgear.
- the measure according to the invention allows easier measurement.
- the power or heat output P a of the fuse must not exceed the permissible power consumption value of the fuse chamber.
- the tripping voltage U a of the system with the protective device according to the invention is dimensioned such that the product of the tripping voltage U a and the operating current I b does not exceed the value of, for example, 75 W with increasing melting resistance R.
- the protective device according to the invention not only monitors the power output of the fuse, but also triggers the transformer switch before the permissible power output value or at the latest when this value or the power consumption value of the fuse chamber is exceeded. In contrast to a known solution, the protection works independently of the nominal fuse current and only depending on the power output of the fuse.
- the protective device can thus be designed for the usual permissible power consumption values of fuse boxes in SF 6 -insulated switchgear.
- the invention is also expediently designed such that the HV fuse is arranged in a cast resin housing within an SF 6 chamber as a fuse chamber.
- the insulating sulfur hexafluoride gas has excellent insulating properties, can reduce the spacing of the components and thus also make an enclosed switchgear very compact.
- the fuses are used in narrow chambers, which on the one hand severely restrict the heat dissipation from the fuse and on the other hand only have a limited heat absorption capacity. If the protective device according to the invention is correctly assigned to the transformers, there is no risk of thermal overload for the fuse chambers as long as the fuses are in order. In the event of their damage or partial destruction, the power output value of the fuse is reached or exceeded under special circumstances, and then the tripping device opens the transformer switch.
- the triggering device is designed as a striker device.
- the above formula of the product of tripping voltage U a and operating current I b applies in the same way.
- the protective device according to the invention works particularly cheaply, if after a another advantageous embodiment, the HV fuse at least one main fuse and at least has an auxiliary fuse element. You can then go to the Recall suggestions for striking pin devices that have already been given in the literature, that respond to the melting down of an auxiliary fuse element, for example.
- the melting device according to the invention is the possibility of monitoring the heat output of the fuse, for example, freedom from aging and the functionality regardless of the installation position of the fuse.
- the new protective device is also based on Ohm's law.
- the new device according to the invention is used in a switchgear with encapsulated compartments, for example in a transformer house with a medium-voltage switchgear, then the feared damage in the destruction of SF 6 switchgear can be prevented with advantage. In this way, switchgear can also be set in populated areas and operated there safely. Because the protective device according to the invention works perfectly even at low trigger voltages for the firing pin system, good and safe protection can still be provided up to large operating currents.
- FIG. 1 shows the fuse chamber 1 schematically by a dash-dotted line.
- This is specifically an SF 6 -insulated switchgear.
- the entire switchgear 23 is divided into a lower cable section 2, an upper cable section 3 and the transformer section 4 located in the middle.
- the upper cable switch 6 of the cable section 3 leads from a busbar 5 which passes through all three sections 2, 3, 4 to a ring cable outlet 7, while the cable switch 8 in the lower cable panel 2 leads to the ring cable outlet 9.
- the cable or transformer switch 10 arranged in the center of the transformer field 4 also creates an outlet from the busbar 5 when it is closed, but via the high-voltage high-power fuse designated by 11. This is connected to the transformer outlet 14 towards the transformer 15.
- the transformer 15 is together with the transformer outlet 14 and HV fuse 11 in Figure 2 enlarged and clearly drawn out.
- the one connected to the HV fuse 11 dashed line 16 illustrates the striker device on the HV fuse Transformer switch 10 is shown with free trip.
- the protective device shown in the drawings also protects the fuse chamber 1 against thermal overload if one or the other (or more) of the partial fuse elements of the main fuse element 21 have melted and the resistance of the HV fuse block 11 thereby undesirably increased. If, for example, a 20 kV-40A fuse has three partial fuse elements, two of which are defective, the power output of the fuse P a exceeds the predetermined threshold value of 75 W, with the result that the striker pin 16 triggers and the transformer switch with free release 10 opens. Even at a current which is below the nominal current of the fuse, tripping can take place and the thermal overload of the fuse chamber 1 can be avoided in this way.
Landscapes
- Fuses (AREA)
- Protection Of Generators And Motors (AREA)
- Thermally Actuated Switches (AREA)
Abstract
Description
- Figur 1
- schematisch die Sicherungskammer einer SF6-Schaltanlage mit einer Ringkabelleitung,
- Figur 2
- einen Ausschnitt der Schutzreinrichtung im Transformatorabgangsfeld der Sicherungskammer mit nachgeschaltetem Transformator und
- Figur 3
- die schematische Darstellung einer Sicherung mit einem Hauptschmelzleiter und einem parallel dazu geschalteten Hilfsschmelzleiter mit Haltedraht und Schlagstift.
- 1
- Sicherungskammer
- 2
- unteres Kabelfeld
- 3
- oberes Kabelfeld
- 4
- Tansformatorfeld
- 5
- Sammelschiene
- 6
- Kabelschalter des Kabelfeldes 3
- 7
- Ringkabelabgang
- 8
- Kabelschalter 8
- 9
- Ringkabelabgang 9
- 10
- Transformatorschalter
- 11
- HH-Sicherung
- 12
- 13
- 14
- Transformatorabgang
- 15
- Transformator
- 16
- Schlagstift
- 17
- Haltedraht
- 18
- Druckfeder
- 19
- Sicherungskontakt
- 20
- Sicherungskontakt
- 21
- Hauptschmelzleiter
- 22
- Hilfsschmelzleiter
- 23
- Mittelspannungsschaltanlage
Claims (7)
- Schutzeinrichtung gegen die thermische Überlastung der Sicherungskammer (1) einer Schaltanlage mit nachgeschaltetem Transformator (15), beispielsweise zur Versorgung eines Niederspannungsfeldes, wobei in der Sicherungskammer (1) eine Hochspannungs-Hochleistungs-Sicherung (11) mit einer Auslöseeinrichtung (16-18) zum Schalten eines Transformatorschalters (10) mit Freiauslösung angeordnet ist, dadurch gekennzeichnet, daß die HH-Sicherung (11) mit der Auslöseeinrichtung (16-18) so gestaltet ist, daß letztere spätestens bei Überschreiten eines zulässigen Leistungsaufnahmewertes der Sicherungskammer (1) über ihre Auslösespannung (Ua) den Transformatorschalter (10) öffnet.
- Schutzeinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Auslösespannung (Ua) spätestens bei Überschreiten eines zulässigen Leistungsabgabewertes (Pa) der Sicherung (11) erreicht wird.
- Schutzeinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Leistungsabgabewert (Pa) im Bereich zwischen 60 W und 90 W liegt.
- Schutzeinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Leistungsabgabewert (Pa) etwa gleich 75 W ist.
- Schutzeinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die HH-Sicherung (11) in einem Gießharzgehäuse innerhalb einer SF6-Kammer als Sicherungskammer (1) angeordnet ist.
- Schutzeinrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Auslöseeinrichtung (16-18) als Schlagstiftvorrichtung ausgebildet ist.
- Schutzeinrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die HH-Sicherung (11) wenigstens einen Hauptschmelzleiter (21) und wenigstens einen Hilfsschmelzleiter (22) aufweist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI9930994T SI0980086T1 (sl) | 1998-08-11 | 1999-06-24 | Priprava z zascito pred termicno preobremenitvijostikalne priprave |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19836270A DE19836270B4 (de) | 1998-08-11 | 1998-08-11 | Schutzeinrichtung gegen die thermische Überlastung einer Schaltanlage |
DE19836270 | 1998-08-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0980086A1 true EP0980086A1 (de) | 2000-02-16 |
EP0980086B1 EP0980086B1 (de) | 2007-08-22 |
Family
ID=7877132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99112165A Expired - Lifetime EP0980086B1 (de) | 1998-08-11 | 1999-06-24 | Schutzeinrichtung gegen die thermische Überlastung einer Schaltanlage |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0980086B1 (de) |
AT (1) | ATE371257T1 (de) |
DE (1) | DE19836270B4 (de) |
ES (1) | ES2291006T3 (de) |
SI (1) | SI0980086T1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015100399A1 (de) | 2015-01-13 | 2016-07-14 | Hochschule Für Technik Und Wirtschaft Berlin | Anordnung bestehend aus einer Schmelzsicherung und einer an der Schmelzsicherung angeordneten Messeinrichtung sowie Messeinrichtung |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3048629A1 (de) * | 2015-01-23 | 2016-07-27 | Jozef Smrkolj | Leitungsschutzschalter |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR896208A (fr) * | 1942-05-04 | 1945-02-15 | Licentia Gmbh | Appareil électrique commandé de sécurité ou de coupure |
DE1920825A1 (de) * | 1969-04-24 | 1970-11-05 | Fritz Driescher Spez Fabrik Fu | Hochspannungs-Hochleistungssicherung |
US4369420A (en) * | 1980-05-27 | 1983-01-18 | Westinghouse Electric Corp. | Current limiting fuse with actuable external means |
DE3413219A1 (de) * | 1983-04-12 | 1984-10-18 | Aktieselskabet Norsk Elektrisk & Brown Boveri, Skien | Vorrichtung fuer kompaktschalter-anlagen |
DE3623424A1 (de) * | 1986-07-11 | 1988-01-14 | Wickmann Werke Gmbh | Verfahren zum abschalten einer ein- oder mehrphasigen elektrischen schaltanlage und einrichtung zur abschaltung |
DE19519934A1 (de) * | 1995-05-31 | 1996-12-05 | Meuleman Andre Dipl Ing | Vollschutz für ölisolierter oder gasisolierter Leistungstransformator |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3429711A1 (de) * | 1983-10-27 | 1985-05-09 | Fritz Driescher KG Spezialfabrik für Elektrizitätswerksbedarf GmbH & Co, 5144 Wegberg | Gasisolierte mittelspannungsschaltanlage |
DE3426404A1 (de) * | 1984-07-18 | 1986-01-23 | Felten & Guilleaume Energietechnik GmbH, 5000 Köln | Hochspannungs-hochleistungs-sicherung |
DE4000721C2 (de) * | 1989-01-14 | 1998-12-17 | Driescher Spezialfab Fritz | Mittelspannungs-Schaltanlage |
-
1998
- 1998-08-11 DE DE19836270A patent/DE19836270B4/de not_active Expired - Lifetime
-
1999
- 1999-06-24 SI SI9930994T patent/SI0980086T1/sl unknown
- 1999-06-24 AT AT99112165T patent/ATE371257T1/de not_active IP Right Cessation
- 1999-06-24 EP EP99112165A patent/EP0980086B1/de not_active Expired - Lifetime
- 1999-06-24 ES ES99112165T patent/ES2291006T3/es not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR896208A (fr) * | 1942-05-04 | 1945-02-15 | Licentia Gmbh | Appareil électrique commandé de sécurité ou de coupure |
DE1920825A1 (de) * | 1969-04-24 | 1970-11-05 | Fritz Driescher Spez Fabrik Fu | Hochspannungs-Hochleistungssicherung |
US4369420A (en) * | 1980-05-27 | 1983-01-18 | Westinghouse Electric Corp. | Current limiting fuse with actuable external means |
DE3413219A1 (de) * | 1983-04-12 | 1984-10-18 | Aktieselskabet Norsk Elektrisk & Brown Boveri, Skien | Vorrichtung fuer kompaktschalter-anlagen |
DE3623424A1 (de) * | 1986-07-11 | 1988-01-14 | Wickmann Werke Gmbh | Verfahren zum abschalten einer ein- oder mehrphasigen elektrischen schaltanlage und einrichtung zur abschaltung |
DE19519934A1 (de) * | 1995-05-31 | 1996-12-05 | Meuleman Andre Dipl Ing | Vollschutz für ölisolierter oder gasisolierter Leistungstransformator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015100399A1 (de) | 2015-01-13 | 2016-07-14 | Hochschule Für Technik Und Wirtschaft Berlin | Anordnung bestehend aus einer Schmelzsicherung und einer an der Schmelzsicherung angeordneten Messeinrichtung sowie Messeinrichtung |
WO2016113245A1 (de) | 2015-01-13 | 2016-07-21 | Hochschule Für Technik Und Wirtschaft Berlin | Anordnung mit einer elektrischen sicherungseinrichtung und einer an der sicherungseinrichtung angeordneten messeinrichtung sowie messeinrichtung |
DE102015100399B4 (de) * | 2015-01-13 | 2016-07-28 | Hochschule Für Technik Und Wirtschaft Berlin | Anordnung bestehend aus einer Schmelzsicherung und einer an der Schmelzsicherung angeordneten Messeinrichtung sowie Messeinrichtung |
Also Published As
Publication number | Publication date |
---|---|
EP0980086B1 (de) | 2007-08-22 |
ES2291006T3 (es) | 2008-02-16 |
DE19836270B4 (de) | 2010-11-25 |
DE19836270A1 (de) | 2000-02-17 |
ATE371257T1 (de) | 2007-09-15 |
SI0980086T1 (sl) | 2008-02-29 |
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