EP0980086B1 - Schutzeinrichtung gegen die thermische Überlastung einer Schaltanlage - Google Patents

Schutzeinrichtung gegen die thermische Überlastung einer Schaltanlage Download PDF

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Publication number
EP0980086B1
EP0980086B1 EP99112165A EP99112165A EP0980086B1 EP 0980086 B1 EP0980086 B1 EP 0980086B1 EP 99112165 A EP99112165 A EP 99112165A EP 99112165 A EP99112165 A EP 99112165A EP 0980086 B1 EP0980086 B1 EP 0980086B1
Authority
EP
European Patent Office
Prior art keywords
fuse
transformer
chamber
voltage
protective device
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.)
Expired - Lifetime
Application number
EP99112165A
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German (de)
English (en)
French (fr)
Other versions
EP0980086A1 (de
Inventor
Herbert Dr.-Ing. Bassei
Thomas Klemme
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EFEN GmbH
Original Assignee
EFEN GmbH
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Filing date
Publication date
Application filed by EFEN GmbH filed Critical EFEN GmbH
Priority to SI9930994T priority Critical patent/SI0980086T1/sl
Publication of EP0980086A1 publication Critical patent/EP0980086A1/de
Application granted granted Critical
Publication of EP0980086B1 publication Critical patent/EP0980086B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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, wherein in the fuse chamber, a high-voltage high-performance fuse and a triggering device for switching a transformer switch are arranged.
  • HH fuse The principal object of a high-voltage high-performance fuse, hereinafter referred to as HH fuse, is to bring the fuse element to melt during a short-circuit current in the transformer, so that the transformer is protected against the most dangerous consequences of an internal short circuit, for example against the explosion an oil-filled boiler with fire sequence and the like.
  • Transformer stations with a medium-voltage compartment, a transformer and a low-voltage compartment, for example, are used to supply settlement systems in inhabited areas and must therefore be urgently and optimally protected.
  • HH fuses with impact detector have various disadvantages. For example, they can not turn off at relatively low currents or not fast enough, so that overheating and thermal overload of the fuse chamber of a switchgear can not always be reliably avoided.
  • the rated current of a fuse is often chosen to be twice to three times the transformer rated current.
  • large current values must not flow through the transformer in the long term.
  • network management often prevents the transformer from carrying significant overcurrents, for example, so as not to overly heated.
  • Such a high and impermissible current value is below the rated current value of the fuse. The latter is therefore not achieved in practice, so that a protection device for this range of current values can not be effective.
  • the current range between the rated 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 can rise. This can lead to a risk to the fuse, even with normal transformer operating currents, for example, if from the main fusible conductor, which consists of several sub-conductors, parallel fused conductors, individual partial fusible conductors are destroyed.
  • the thermal output P a of the fuse ie the power loss of the fuse, can reach a critical value, which is greater than the power capacity of the fuse chamber, at very low currents. As a result, the fuse chamber is thermally overloaded.
  • Out DE 36 23 424 A is a protective device similar to the type described above, in which an electrical switchgear, inter alia, with integrated transformer is turned off and in which a high-voltage high-power fuse is provided.
  • the voltage across the fuse element is measured at each fuse, the measured value is compared in an electrical circuit with a threshold value, and when it is exceeded, mechanical elements are actuated, in particular by the switching on of electromagnets.
  • an amplifier for each measuring signal a downstream differential measuring device and an output power stage are provided in this device.
  • the measurement signals for the shutdown are processed in a subsequent, high-resistance electrical circuit, each measurement signal is amplified and an OR element is supplied.
  • the output of the shutdown signal is due to the measurement signals, which are processed in an external circuit, completely separate from the fuse.
  • conventional fuse carriers for the coupling capacitances should be suitable in the known case, via which the measured values are decoupled.
  • One embodiment describes the conventional mechanical release of circuit breakers that can be at least partially maintained. When triggered, a pin leaving the fuse drives a linkage, which in turn causes the opening of the circuit breaker. This triggering case can be seen separately from the known external measuring circuit, which is connected downstream of the respective coupling capacitor at a distance from the fuse.
  • the DE 19 20 825 describes a high voltage high performance fuse whose purpose is to operate said device to operate a circuit breaker located outside the fuse. This should be done before the heating of the fuse box reaches a level that jeopardizes its integrity.
  • the load or circuit breaker is in the circuit of the fuse. About a fuse chamber and their thermal overload can be found no statements, but only about the fuse itself. Also via a parallel connection of main and auxiliary fusible link can be found no information.
  • the HV fuse has at least one main fuse and at least one parallel connected auxiliary fuse and is designed with the triggering device so that the latter at the latest when exceeding a permissible power consumption value of the fuse chamber on their trip voltage to a trip-free having transformer switch opens.
  • the opening of the transformer switch can be independent of the operating current, even at low operating current, ie in extreme cases even below the rated transformer current.
  • the triggering always occurs before and at the latest when the predetermined permissible power consumption value of the fuse chamber is exceeded.
  • the triggering according to the invention takes place, for example, even at values far below the rated fuse current I Nenn .
  • the new protection device according to the invention prevents just the thermal overload of the fuse chamber.
  • the power output value of the fuse link is preset to a permissible maximum value below the power consumption value of the fuse chamber and must not be exceeded. If, for example, an excessively large power output takes place internally by a current-carrying fusible conductor, then the fuse chamber heats up and can be thermally overloaded when the permissible power consumption value is exceeded.
  • the tripping voltage is reached at the latest when an allowable power output value of the fuse is exceeded.
  • the maximum power output value is reached when the power capacity of the fuse chamber is exceeded. As long as the power output of the fuse does not exceed the maximum power capacity of the fuse chamber, there is no danger to the switchgear.
  • the maximum power capacity is specified by the respective manufacturer of the switchgear.
  • the protective device according to the invention in a surprising manner prevents possible thermal overload of the fuse chamber.
  • the measure according to the invention of using the power output value as a triggering criterion 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 so dimensioned that the product of the tripping voltage U a and the operating current I b with increasing melt resistance R does not exceed the value of 75 W, for example.
  • the protection device according to the invention the power output of the fuse is not only monitored, but also the transformer switch is triggered before the allowable power output value or at the latest when this value or the power consumption value of the fuse chamber is exceeded.
  • the protection works independently of the rated fuse current and only depends on the power output of the fuse.
  • the protective device can thus be designed for the usual permissible power consumption values of safety combs in SF 6 -isolated switchgear.
  • the invention is further configured in that the HH fuse is arranged with its triggering device in a cast resin housing within a SF 6 chamber as a backup chamber. Due to the insulating sulfur hexafluoride gas one has excellent insulating properties, can reduce the spacing of the components and thus build a very compact encapsulated switchgear. In such systems, the fuses are used in tight chambers, on the one hand severely restrict the heat dissipation from the fuse and on the other hand even have only a limited heat 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 case of their damage or partial destruction, the power output value of the fuse is reached or exceeded in special circumstances, and then the tripping device opens the transformer switch.
  • the triggering device is designed as a striking pin device.
  • the melting device according to the invention apart from the possibility of monitoring the heat output of the fuse, for example, the freedom from aging and the functionality regardless of the mounting position of the fuse.
  • the new protection device is also based on ohm's law.
  • FIG. 1 shows the fuse chamber 1 schematically by a dot-dash line.
  • This is specifically a SF 6 insulated switchgear.
  • the entire switchgear 23 is divided into a lower cable panel 2, an upper cable panel 3 and located in the middle of the transformer array 4. From a busbar 5, which passes through all three fields 2, 3, 4, the upper cable switch 6 of the cable 3 leads to a ring cable outlet 7, while the cable switch 8 leads in the lower cable box 2 to the ring cable outlet 9.
  • the cable or transformer switch 10 disposed in the center-mounted transformer array 4 provides a drain from the busbar 5 when it is closed, but via the high-voltage high-power fuse designated 11. This is connected to the transformer output 14 to the transformer 15 out.
  • the dashed line 16 subsequent to the HH fuse 11 illustrates the striker device on the HH fuse.
  • the transformer switch 10 is shown with trip-free.
  • FIG 3 the high-voltage high-performance fuse 11 is shown enlarged.
  • striker pin 16 which is held by a retaining wire 17 against the force of a compression spring 18.
  • the current from the opposite fuse contact 20 flows once to the strike-side fuse contact 19 via the main fusible conductor 21 and via the auxiliary fusible conductor 22 connected in parallel thereto.
  • the current flowing through the auxiliary fusible conductor 22 also flows through the holding wire 17 which follows breaks the melting and the striker 16 triggers to open the transformer switch 10.
  • the protective device shown in the drawings also provides protection of the fuse chamber 1 against thermal overload when one or the other (or more) of the partial fusible conductors of the main fusible conductor 21 has melted and thereby undesirably increases the resistance of the HH fuse 11. If a 20 kV-40A fuse has, for example, three Teitschmelzleiter, of which two are defective, then the power output of the fuse P a exceeds the predetermined threshold of 75 W, with the result that the striker 16 triggers and opens the transformer switch with free trip 10. Even with a current that is below the rated current of the fuse, so that a triggering can take place and in this way the thermal overload of the fuse chamber 1 can be avoided.

Landscapes

  • Fuses (AREA)
  • Protection Of Generators And Motors (AREA)
  • Thermally Actuated Switches (AREA)
EP99112165A 1998-08-11 1999-06-24 Schutzeinrichtung gegen die thermische Überlastung einer Schaltanlage Expired - Lifetime EP0980086B1 (de)

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 EP0980086A1 (de) 2000-02-16
EP0980086B1 true 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 (es)
AT (1) ATE371257T1 (es)
DE (1) DE19836270B4 (es)
ES (1) ES2291006T3 (es)
SI (1) SI0980086T1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP3048629A1 (de) * 2015-01-23 2016-07-27 Jozef Smrkolj Leitungsschutzschalter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
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
NO152528C (no) * 1983-04-12 1985-10-09 Norsk Elektrisk & Brown Boveri Anordning ved kompaktbryteranlegg.
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
DE3623424C2 (de) * 1986-07-11 1997-09-25 Wickmann Werke Gmbh Verfahren zum Abschalten einer ein- oder mehrphasigen elektrischen Schaltanlage und Einrichtung zur Abschaltung
DE4000721C2 (de) * 1989-01-14 1998-12-17 Driescher Spezialfab Fritz Mittelspannungs-Schaltanlage
DE19519934A1 (de) * 1995-05-31 1996-12-05 Meuleman Andre Dipl Ing Vollschutz für ölisolierter oder gasisolierter Leistungstransformator

Also Published As

Publication number Publication date
ES2291006T3 (es) 2008-02-16
DE19836270B4 (de) 2010-11-25
EP0980086A1 (de) 2000-02-16
DE19836270A1 (de) 2000-02-17
ATE371257T1 (de) 2007-09-15
SI0980086T1 (sl) 2008-02-29

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