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EMPLOYING LOAD TEMPERATURE CORRELATION ANALYSIS FOR BURIAL STATE ANALYSIS OF AN ELECTRICAL POWER CABLE
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Title:
EMPLOYING LOAD TEMPERATURE CORRELATION ANALYSIS FOR BURIAL STATE ANALYSIS OF AN ELECTRICAL POWER CABLE
Author:
LUX, Jonathan
Subjects:
ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS
;
MEASURING
;
MEASURING ANGLES
;
MEASURING AREAS
;
MEASURING ELECTRIC VARIABLES
;
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
;
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
;
MEASURING MAGNETIC VARIABLES
;
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
;
MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
;
MEASURING QUANTITY OF HEAT
;
MEASURING TEMPERATURE
;
PHYSICS
;
TARIFF METERING APPARATUS
;
TESTING
;
THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
Description:
It is provided a method of estimating a burial state of a subsea electrical power cable (5), the method comprising: obtaining load data samples (4) pertaining to plural points in time (t) at one or more locations, the load data samples indicating an electrical load the power cable (5) is subjected to; obtaining temperature data samples (15, 16) pertaining to plural locations (x_i, i) along the power cable (5) and pertaining to the plural points in time; deriving, for each location (x_i), from the load data samples (4) and the temperature data samples (15, 16), a location specific covariance related quantity (C_i(Δt)) related to a covariance or a correlation of the load and a temporal temperature change; each covariance related quantity may be determined by multiplying the current at a particular point in time with the temperature change at a point shifted in time by Δt over an extended period of time, and for a plurality of different shifts Δt. The state of the power cable is estimated based on analyzing the derived covariance related quantities (C_i(Δt)), without the need to perform thermal modelling. The maximum of the temperature increase, and its time-shift with regard to the point in time with regard to the load data sampling point depends on the burial state. L'invention concerne un procédé d'estimation d'un état d'enfouissement d'un câble d'alimentation électrique sous-marin (5), le procédé comprenant : l'obtention d'échantillons de données de charge (4) se rapportant à de multiples instants (t) à un ou plusieurs emplacements, les échantillons de données de charge indiquant une charge électrique à laquelle le câble d'alimentation (5) est soumis ; l'obtention d'échantillons de données de température (15, 16) se rapportant à de multiples emplacements (x_i, i) le long du câble d'alimentation (5) et aux multiples instants ; la dérivation, pour chaque emplacement (x_i), à partir des échantillons de données de charge (4) et des échantillons de données de température (15, 16), d'une quantité liée à la covariance propre à l'emplacement (C_i[Δt]) liée à une covariance ou une corrélation de la charge et d'un changement de température temporel ; chaque quantité liée à la covariance peut être déterminée en multipliant le courant à un instant particulier avec le changement de température à un instant décalé dans le temps de Δt sur une période prolongée, et pour une pluralité de décalages différents Δt. L'état du câble d'alimentation est estimé sur la base de l'analyse des quantités dérivées liées à la covariance (C_i[Δt]), sans qu'il soit nécessaire d'effectuer une modélisation thermique. Le maximum de l'augmentation de température et son décalage dans le temps par rapport à l'instant d'échantillonnage des données de charge dépendent de l'état d'enfouissement.
Creation Date:
2023
Language:
English;French
Source:
esp@cenet
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