EP1649475B1 - Procede de surveillance d'huile isolante - Google Patents

Procede de surveillance d'huile isolante Download PDF

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Publication number
EP1649475B1
EP1649475B1 EP04732957A EP04732957A EP1649475B1 EP 1649475 B1 EP1649475 B1 EP 1649475B1 EP 04732957 A EP04732957 A EP 04732957A EP 04732957 A EP04732957 A EP 04732957A EP 1649475 B1 EP1649475 B1 EP 1649475B1
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EP
European Patent Office
Prior art keywords
changer
load tap
max
limit value
calculated
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
EP04732957A
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German (de)
English (en)
Other versions
EP1649475A1 (fr
Inventor
Rainer Frotscher
Konrad Roider
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.)
Maschinenfabrik Reinhausen GmbH
Scheubeck GmbH and Co
Original Assignee
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Publication date
Application filed by Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen GmbH
Publication of EP1649475A1 publication Critical patent/EP1649475A1/fr
Application granted granted Critical
Publication of EP1649475B1 publication Critical patent/EP1649475B1/fr
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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H2009/0061—Monitoring tap change switching devices

Definitions

  • the invention relates to a method for monitoring the contamination of insulating oil in on-load tap-changers.
  • the publication describes that after a certain number of switches, the potential danger of a malfunction of the on-load tap-changer increases. Furthermore, it is mentioned that the deterioration of the state of the insulating oil of the on-load tap changer is caused by the unavoidable arcing during the switching. It is further stated that the contact erosion which arises during operation over time can be summed up, ie accumulated. If this cumulative value exceeds a certain limit, maintenance is required, which can be signaled.
  • the object of the invention is an alternative method for monitoring the insulating oil, d. H. the determination of its current state of soiling, to be specified in an on-load tap-changer.
  • the general inventive idea is to use, in a method according to claim 1, the arc energy released in a load circuit under oil to determine the ⁇ lverrußung the insulating oil and derive the information about the required oil change from the progressive degree of oil pollution determined in this way.
  • the method according to the invention uses only a measured electrical quantity to determine the carbon black content; It therefore does not require any additional sensors or other components inside the on-load tap-changer.
  • the method according to the invention is based on the arc energy E, which is released under oil in a load circuit. This decomposes the oil and produces soot. Switching and resistance contacts of the on-load tap-changer with their different switching currents contribute their respective different contributions. The individual switching currents are using the measured current transformer load current determined. This load current is the only variable input that needs to be measured.
  • ParSek means the number of parallel sectors of the diverter switch, ie the parallel circuits of individual switching contacts, U S is the respective nominal step voltage and S res is the resulting current division. R 0 denotes the size of the switching resistance. All of these variables are step-switch-specific and are stored non-volatile as on-load tap-changer parameters, ie they are defined before the start of the process.
  • the factor AnzSek designates the number of diverter switch sectors or switching segments.
  • U Lb denotes the mean arc voltage and t Lb the mean arc time.
  • the respectively determined arc energies are summed up at each load circuit and result in the cumulated arc energy GE, which is compared with a previously set and likewise non-volatile stored value GE max ; Depending on the comparison, warning or shutdown functions can be generated.
  • GE max 50,000 KWs.
  • the limit value GE max in such a case during the entire life of the on-load tap changer u. U. never be reached. Therefore, according to a first development of the method according to the invention, it is additionally checked whether a maximum number of load circuits has been reached. If this is the case, a warning or the like is generated regardless of the amount of accumulated arc energy GE.
  • a certain time interval from startup ie. H. a maximum allowable operating time, which can be granted to the on-load tap-changer without interim maintenance, is reached. If this is the case, a warning or the like is generated, again independently of the level of the arc energy GE accumulated until then.
  • n denotes an index which is incremented by 1 each time the on-load tap changer is operated.
  • the load current J L is first measured with each actuation of the on-load tap changer.
  • the switching currents J SK and J WK of the disconnecting contacts are determined therefrom.
  • these switching currents are summed up and yield ⁇ J.
  • the arc energy E n occurring at the respective load circuit is calculated and finally the cumulated arc energy GE n is determined therefrom.
  • the value of the cumulative arc energy GE n is buffered and accumulated together with the then calculated arc energy E n + 1 at the next actuation to the then new total value GE n + 1 .
  • this cumulative arc energy GE n is then compared with a pre-set limit value GE max .
  • a two-stage comparison is shown. Is a certain percentage of the limit GE max reached, z. B. 90%, a warning can be generated, which indicates an approaching oil change. The operator can then take appropriate precautions and still has enough time to such an oil change z. B. to make as part of a maintenance. Finally, when 100% of the limit is reached, a second, more conspicuous warning message can be generated; Alternatively, a shutdown of the transformer could take place.
  • numerous other comparison modes are conceivable within the scope of the invention; It is only important that the arc energy GE n accumulated during the load circuits is compared with a corresponding limit value.
  • FIG. 2 shows a second method according to the invention, in which additionally a check is carried out whether a certain total number of switching has been reached, ie the index n has reached a certain maximum value n max .
  • FIG. 3 finally shows another method in which, in addition to in FIG. 1 shown method is still checked whether a certain absolute operating time t of the on-load tap-changer has reached a threshold t max .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Transformers (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Processing Of Terminals (AREA)

Claims (4)

  1. Méthode de surveillance de la pollution d'huile d'isolation suite à une décharge d'arc dans des changeurs de prises en charge
    dans laquelle le courant de charge JL du transformateur est mesuré à chaque commutation, c'est-à-dire à chaque actionnement du changeur de prises en charge,
    un indice n étant incrémenté à chaque commutation,
    une grandeur caractéristique étant déterminée pendant chaque commutation, puis cumulée à celles des commutations précédentes
    et une valeur limite de la grandeur caractéristique cumulée étant prédéfinie et dont le dépassement génère des signaux,
    cette méthode est caractérisée
    par l'entrée et l'enregistrement rémanent des paramètres spécifiques de changeur de prises en charge ainsi que d'une valeur limite de l'énergie d'arc admissible GEmax comme grandeur caractéristique,
    par la détermination ensuite du courant commuté JSK du contact de commutation coupant le circuit ainsi que du courant commuté JWK d'au moins un contact de passage coupant le circuit,
    par la sommation ensuite des valeurs des courants commutés déterminés JSK et JWK permettant d'obtenir le courant commuté total ΣJ,
    par la détermination ensuite de l'énergie d'arc En à l'aide de la relation E = ΣJ ⋅ U Lb ⋅ t Lb ⋅ AnzSek Ws
    Figure imgb0012
    avec ULb la tension d'arc moyenne, tLb la durée d'arc moyenne et AnzSek le nombre de secteurs de commutateur ou de segments de commutation, ces facteurs faisant partie des paramètres spécifiques de changeur de prises en charge enregistrés de façon rémanente,
    par la détermination ensuite de l'énergie d'arc totale cumulée GE n = GE n - 1 + E n
    Figure imgb0013
    comme somme des énergies d'arc déterminée pour toutes les commutations ayant eu lieu jusqu'ici (de 1 à n)
    et d'autre part par une comparaison de l'énergie d'arc cumulée GEn avec la valeur limite de l'énergie d'arc GEmax
  2. Méthode selon la revendication 1, le courant commuté JSK pour le contact de commutation étant déterminé par la relation J SK = J L / ParSek
    Figure imgb0014
     et le courant commuté JWK pour le contact de passage étant déterminé par la relation J WK = U S + J L ⋅ R ü / S res / 2 ⋅ R ü
    Figure imgb0015
     avec ParSek le nombre de secteurs parallèles du changeur de prises en charge, c'est-à-dire de commutations parallèles de chacun des contacts de commutation, Us la tension d'échelon nominale respective, Sres la division du courant résultante et Rü la grandeur de la résistance de passage, ces valeurs faisant partie des paramètres spécifiques du changeur de prises en charge enregistrées de façon rémanente.
  3. Méthode selon la revendication 1 ou 2, dans laquelle, en outre, l'index n continu est comparé à une valeur limite Nmax définie auparavant, un signal étant généré lorsque cette valeur limite Nmax est atteinte.
  4. Méthode selon la revendication 1, 2 ou 3 dans laquelle, en outre, le temps de service t du changeur de prises en charge est comparé à une valeur limite tmax définie auparavant à chaque fois qu'il est atteint, un signal étant généré lorsque cette valeur limite tmax est atteinte.
EP04732957A 2003-07-30 2004-05-14 Procede de surveillance d'huile isolante Expired - Lifetime EP1649475B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10334688A DE10334688B3 (de) 2003-07-30 2003-07-30 Verfahren zur Überwachung von Isolieröl
PCT/EP2004/005175 WO2005022573A1 (fr) 2003-07-30 2004-05-14 Procede de surveillance d'huile isolante

Publications (2)

Publication Number Publication Date
EP1649475A1 EP1649475A1 (fr) 2006-04-26
EP1649475B1 true EP1649475B1 (fr) 2009-02-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04732957A Expired - Lifetime EP1649475B1 (fr) 2003-07-30 2004-05-14 Procede de surveillance d'huile isolante

Country Status (6)

Country Link
EP (1) EP1649475B1 (fr)
AT (1) ATE424031T1 (fr)
DE (2) DE10334688B3 (fr)
ES (1) ES2321516T3 (fr)
PT (1) PT1649475E (fr)
WO (1) WO2005022573A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007026175B4 (de) * 2007-06-05 2009-10-01 Areva Energietechnik Gmbh Verfahren zur Ermittlung der Alterung eines elektrischen Transformators

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS507727B1 (fr) * 1969-11-04 1975-03-28
DE4028721C2 (de) * 1990-09-10 1995-05-11 Siemens Ag Verfahren und Anordnung zur Ermittlung der Restlebensdauer von Schaltgeräten
DE10003918C1 (de) * 2000-01-29 2001-07-05 Reinhausen Maschf Scheubeck Verfahren zur Überwachung des Kontaktabbrandes bei Stufenschaltern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ADIL ERK, MARTIN SCHMELZLE: "Grundlagen der Schaltgerätetechnik", 1974, SPRINGER VERLAG BERLIN, BERLIN *

Also Published As

Publication number Publication date
DE10334688B3 (de) 2005-02-03
ES2321516T3 (es) 2009-06-08
WO2005022573A1 (fr) 2005-03-10
PT1649475E (pt) 2009-05-07
DE502004009048D1 (de) 2009-04-09
EP1649475A1 (fr) 2006-04-26
ATE424031T1 (de) 2009-03-15

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