EP1649475A1 - Verfahren zur überwachung von isolieröl - Google Patents
Verfahren zur überwachung von isolierölInfo
- Publication number
- EP1649475A1 EP1649475A1 EP04732957A EP04732957A EP1649475A1 EP 1649475 A1 EP1649475 A1 EP 1649475A1 EP 04732957 A EP04732957 A EP 04732957A EP 04732957 A EP04732957 A EP 04732957A EP 1649475 A1 EP1649475 A1 EP 1649475A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- limit value
- changer
- load tap
- switching
- max
- 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
Links
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.
- tap-changer Most of the on-load tap-changers currently commercially available for uninterrupted switching under load between different winding taps of a tap-changer, often also referred to as “tap-changer” for short, still work with mechanical switch contacts in insulating oil.
- Oil filter systems are known for cleaning the insulating oil, for example from the company publication of the applicant "Oil filter system OF100", pressure imprint IN173 / 01 de-1099/1000, which have a filter insert which cleans the insulating oil and can also dry it at the same time.
- Such insulating oil change intervals are also after certain periods, e.g. B. after 8 years. With such a rigid timing, the number of switching operations actually completed during this period is of course not taken into account; this is also unsatisfactory for the operator.
- Numerous oil sensors are known for other oils, in particular oils in internal combustion engines, which are arranged there in the oil pan and are intended to determine the oil condition. These are based on a wide variety of physical principles, but they are not all readily applicable to on-load tap-changers. In internal combustion engines, criteria such as viscosity, lubricity and cooling ability are important for evaluating the quality of the oil, while the dielectric or insulating properties, which are particularly important for on-load tap-changers, are not important.
- the object of the invention is therefore to provide a method for monitoring the insulating oil, d. H. the determination of its current state, to be specified in an on-load tap-changer that does not require an additional sensor or other components inside the oil container, but nevertheless provides information that depends on the actual situation and whether, and if so when, the insulating oil must be changed.
- Another object of the invention is to replace the previously rigid oil change intervals with condition-dependent maintenance, but at least to significantly extend these maintenance intervals by overlaying them with a condition-dependent component.
- the general inventive idea is to use the arc energy released during a power shift under oil to determine the oil soot of the insulating oil and to derive the information about the required oil change from the progressive degree of the oil contamination determined in this way.
- the method according to the invention therefore uses only a measured electrical variable for determining the soot 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 during a load switching.
- the oil decomposes and produces soot.
- Switch and resistance contacts of the on-load tap-changer with their different switching currents contribute their respective - different - share.
- the individual switching currents are measured using the measured current transformer load current determined. This load current is the only variable input variable that has to be measured.
- the arc energy E generally results for each
- ParSek means the number of parallel sectors of the diverter switch, ie the parallel connection of individual switch contacts, U s is the respective nominal step voltage and S res is the resulting current division. R ü denotes the size of the contact resistance.
- the quantities mentioned are all tap-changer-specific and are not stored volatile as on-load tap-changer parameters, ie they are defined before the start of the process.
- the AnzSek factor 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 with each load switching and result in the accumulated arc energy GE, which is compared with a previously set and also 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 would in such a case occur during the entire lifetime of the on-load tap-changer and the like. U. never be reached. Therefore, after a first development of the method according to the invention, an additional check is carried out to determine whether a maximum number of load shifts has been reached. If this is the case, a warning or the like is generated, irrespective of the level of the total arc energy GE.
- an additional check is carried out to determine whether a specific time interval from commissioning, ie H. a maximum permissible operating time that can be allowed to the on-load tap-changer without intermediate maintenance has been reached. If this is the case, a warning or the like is generated - again regardless of the amount of the arc energy GE added up to that point.
- Figure 1 shows the flow chart of a first method according to the invention
- Figure 2 shows the flow chart of a second method according to the invention
- FIG. 3 shows the flow chart of a third method according to the invention
- FIG. 4 shows the flow chart of a fourth method according to the invention.
- n denotes an index that is increased by 1 each time the on-load tap-changer is actuated.
- the load current J L is first measured each time the on-load tap-changer is actuated.
- the switching currents J S ⁇ and J w ⁇ of the disconnecting contacts are determined.
- these switching currents are added together and result in ⁇ J.
- the arc energy E n occurring in the respective load switching is then calculated and finally the cumulative arc energy GE n is determined therefrom.
- the value of the accumulated arc energy GE n is in each case temporarily stored and, upon the next actuation, together with the then again calculated arc energy E ⁇ + ⁇ , the new total value GE ⁇ + ⁇ is then accumulated.
- this cumulative arc energy GE n is then compared with a previously set limit value GE max .
- a two-stage comparison is shown as an example in FIG. Is a certain percentage of the limit value GE max reached, e.g. B. 90%, a warning can be generated, which indicates an upcoming oil change. The operator can then take appropriate precautions and still have enough time to carry out such an oil change e.g. B. to be carried out as part of a maintenance. Once 100% of the limit value has been reached, a second, more conspicuous warning message can be generated; alternatively, the transformer could also be switched off.
- FIG. 2 shows a second method according to the invention, in which a check is also carried out to determine whether a certain total number of operations has been reached, ie the index n has reached a certain maximum value n max .
- FIG. 3 shows a further method in which, in addition to the method shown in FIG. 1, a check is also carried out to determine whether a certain absolute operating time t of the on-load tap changer has reached a limit value t max .
- FIG. 4 shows a method in which both the additional number of switching operations n and the operating time t are compared with corresponding limit values n max and t max . This can also be inserted at various points in the process sequence according to FIG. 1.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Transformers (AREA)
- Housings And Mounting Of Transformers (AREA)
- Processing Of Terminals (AREA)
Description
Claims
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 (de) | 2003-07-30 | 2004-05-14 | Verfahren zur überwachung von isolieröl |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1649475A1 true EP1649475A1 (de) | 2006-04-26 |
EP1649475B1 EP1649475B1 (de) | 2009-02-25 |
Family
ID=33560272
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04732957A Expired - Lifetime EP1649475B1 (de) | 2003-07-30 | 2004-05-14 | Verfahren zur überwachung von isolieröl |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1649475B1 (de) |
AT (1) | ATE424031T1 (de) |
DE (2) | DE10334688B3 (de) |
ES (1) | ES2321516T3 (de) |
PT (1) | PT1649475E (de) |
WO (1) | WO2005022573A1 (de) |
Families Citing this family (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS507727B1 (de) * | 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 |
-
2003
- 2003-07-30 DE DE10334688A patent/DE10334688B3/de not_active Expired - Fee Related
-
2004
- 2004-05-14 DE DE502004009048T patent/DE502004009048D1/de not_active Expired - Lifetime
- 2004-05-14 WO PCT/EP2004/005175 patent/WO2005022573A1/de active Application Filing
- 2004-05-14 EP EP04732957A patent/EP1649475B1/de not_active Expired - Lifetime
- 2004-05-14 PT PT04732957T patent/PT1649475E/pt unknown
- 2004-05-14 ES ES04732957T patent/ES2321516T3/es not_active Expired - Lifetime
- 2004-05-14 AT AT04732957T patent/ATE424031T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2005022573A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10334688B3 (de) | 2005-02-03 |
ES2321516T3 (es) | 2009-06-08 |
WO2005022573A1 (de) | 2005-03-10 |
PT1649475E (pt) | 2009-05-07 |
DE502004009048D1 (de) | 2009-04-09 |
EP1649475B1 (de) | 2009-02-25 |
ATE424031T1 (de) | 2009-03-15 |
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