DE1166512B - Procedure for measuring the moisture content of winding insulation - Google Patents
Procedure for measuring the moisture content of winding insulationInfo
- Publication number
- DE1166512B DE1166512B DEL40412A DEL0040412A DE1166512B DE 1166512 B DE1166512 B DE 1166512B DE L40412 A DEL40412 A DE L40412A DE L0040412 A DEL0040412 A DE L0040412A DE 1166512 B DE1166512 B DE 1166512B
- Authority
- DE
- Germany
- Prior art keywords
- insulation
- moisture content
- procedure
- measuring
- dielectric constant
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
Verfahren zur Messung des Feuchtigkeitsgehaltes von Wicklungsisolierungen Das Hauptkriterium der Isolationsgüte und damit maßgebend für die Betriebszuverlässigkeit und Lebensdauer von Ölpapierhochspannungsisolierungen, wie sie hauptsächlich im Wandler- und Transformatorenbau Verwendung finden, ist der Feuchtigkeitsgehalt. Bei offenen Geräten, d. h. Geräten, deren Ausdehnungsgefäße mit der Außenluft in Verbindung stehen, findet eine ständige Wasseraufnahme aus der Luft statt, und auch bei vollkommen abgeschlossenen Geräten entsteht bei der Alterung der Zellulose freies Wasser, das sich vorwiegend in der Papierisolation anreichert.Procedure for measuring the moisture content of winding insulation The main criterion of the insulation quality and thus decisive for the operational reliability and service life of oil-paper high-voltage insulation, as mainly found in the Converters and transformers are used, is the moisture content. With open devices, i. H. Devices whose expansion vessels are in There is a constant uptake of water from the air, and also with completely closed devices, free cellulose arises as it ages Water that mainly accumulates in the paper insulation.
Bisher konnte man lediglich aus den gelegentlich entnommenen Ölproben auf den Zustand der Isolation zurückschließen, was keineswegs ein immer zutreffendes Bild ergab. Es fehlte eine Möglichkeit, den Feuchtigkeitsgehalt der Ölpapierisolation qualitativ und quantitativ einigermaßen zuverlässig zu ermitteln, ohne das Gerät öffnen zu müssen. So far one could only from the occasionally taken oil samples inferring the state of isolation, which is by no means always true Image revealed. There was no way to measure the moisture content of the oil paper insulation to determine qualitatively and quantitatively reasonably reliably without the device to have to open.
Eine Größe, die auf den Wassergehalt empfindlich reagiert, ist die Dielektrizitätskonstante. Aus der Veränderung dieser Dielektrizitätskonstante im Betrieb kann man sehr genau die Zunahme der Wasseraufnahme beurteilen. Es ist Aufgabe der Erfindung, eine Methode herauszufinden, mit der die Dielektrizitätskonstante der hauptsächlich interessierenden Isolation am betriebsfähigen Gerät, also ohne Ausbau und Zerstörung, ermittelt werden kann. Zu diesem Zweck muß die Kapazität der Spulenisolation gemessen werden. Um bevorzugt diese zu messen und weniger die Hauptisolation zwischen den Wicklungen sowie um strom abhängige Induktivitäten weitgehend auszuschalten, wird erfindungsgemäß vorgeschlagen, daß die Resonanzfrequenz des aus den Windungs- und Lagenkapazitäten mit der Streuinduktivität bei kurzgeschlossener Wicklung gebildeten Schwingungskreises als Maß für die Dielektrizitätskonstante der Spulenisolation ermittelt wird. One quantity that is sensitive to the water content is that Dielectric constant. From the change in this dielectric constant im Operation, you can assess the increase in water absorption very precisely. It's a job of the invention to find out a method by which the dielectric constant the insulation on the operational device that is of primary interest, i.e. without Expansion and destruction, can be determined. For this purpose, the capacity must be the coil insulation can be measured. To prefer to measure these and less those Main insulation between the windings and largely around current-dependent inductances turn off, it is proposed according to the invention that the resonance frequency of the from the winding and layer capacitances with the leakage inductance in the case of short-circuited Winding formed oscillation circuit as a measure of the dielectric constant the coil insulation is determined.
Es ist also nur erforderlich, bei der Fertigprüfung im Herstellungswerk für jedes Gerät diese Resonanz- frequenz festzustellen und sie im Betrieb von Zeit zu Zeit nachzumessen. Da die Induktivität sowie die für die Kapazität maßgeblichen geometrischen Abmessungen weitgehend unveränderlich sind, kann eine Verschiebung der Frequenz nur eine Folge der Anderung der Dielektrizitätskonstante sein. Für kompakte reine Zellulose beträgt diese etwa 5,5, für Wasser 80. So it is only necessary during the final inspection in the manufacturing plant for each device this resonance determine frequency and operate them in time to measure time. Since the inductance as well as the decisive for the capacitance Geometric dimensions are largely unchangeable, a shift can occur the frequency can only be a consequence of the change in the dielectric constant. For for compact pure cellulose it is about 5.5, for water 80.
Der weite Spielraum erlaubt eine relativ genaue Messung. Jede Veränderung im Betrieb erlaubt einen quantitativ zuverlässigen Rückschluß auf den geänderten Wasseranteil in der Isolation.The wide margin allows a relatively precise measurement. Every change in operation allows a quantitatively reliable conclusion about the changed Water content in the insulation.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL40412A DE1166512B (en) | 1961-11-07 | 1961-11-07 | Procedure for measuring the moisture content of winding insulation |
GB42095/62A GB1016899A (en) | 1961-11-07 | 1962-11-07 | Improved method of detecting moisture in insulation material of an electrical winding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL40412A DE1166512B (en) | 1961-11-07 | 1961-11-07 | Procedure for measuring the moisture content of winding insulation |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1166512B true DE1166512B (en) | 1964-03-26 |
Family
ID=7269036
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL40412A Pending DE1166512B (en) | 1961-11-07 | 1961-11-07 | Procedure for measuring the moisture content of winding insulation |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1166512B (en) |
GB (1) | GB1016899A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008026997A1 (en) * | 2006-08-29 | 2008-03-06 | Abb Research Ltd. | A method and a device for determining the moisture content in a part of the insulation of a power transformer during drying thereof |
CN102564824A (en) * | 2011-12-30 | 2012-07-11 | 华北电力大学 | Specimen arrangement method for keeping oilpaper moisture balance |
EP3644052B1 (en) | 2018-10-24 | 2022-04-27 | Hitachi Energy Switzerland AG | Electrical device provided with a moisture sensor |
-
1961
- 1961-11-07 DE DEL40412A patent/DE1166512B/en active Pending
-
1962
- 1962-11-07 GB GB42095/62A patent/GB1016899A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1016899A (en) | 1966-01-12 |
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