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Disponibilité de l'Abrégé et des Revendications

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(12) Brevet: (11) CA 2608216
(54) Titre français: DETECTION, LOCALISATION ET INTERPRETATION D'UNE DECHARGE PARTIELLE
(54) Titre anglais: DETECTION, LOCALIZATION AND INTERPRETATION OF PARTIAL DISCHARGE
(51) Classification internationale des brevets (CIB):
  • G01R 31/08 (2006.01)
(72) Inventeurs (Pays):
  • FOURNIER, DANIEL (Canada)
  • CANTIN, BRUNO (Canada)
  • BOURGEOIS, JEAN-MARC (Canada)
  • LEONARD, FRANCOIS (Canada)
  • ROY, YVAN (Canada)
(73) Titulaires (Pays):
  • HYDRO-QUEBEC (Canada)
(71) Demandeurs (Pays):
  • HYDRO-QUEBEC (Canada)
(74) Agent: MORIN, LUC
(45) Délivré: 2014-04-15
(86) Date de dépôt PCT: 2006-05-18
(87) Date de publication PCT: 2006-11-23
Requête d’examen: 2011-03-31
(30) Licence disponible: S.O.
(30) Langue des documents déposés: Anglais

(30) Données de priorité de la demande:
Numéro de la demande Pays Date
2,508,428 Canada 2005-05-20

Abrégé français

Afin de détecter, localiser et interpréter une décharge partielle apparaissant dans un site de décharge partielle d'un matériel électrique, deux sondes de mesures et une sonde de synchronisation sont installées dans le matériel électrique. Les sondes de mesure détectent les impulsions parcourant le matériel électrique alors que la sonde de synchronisation détecte un angle de phase dans le matériel électrique et peut être utilisée à des fins d'étalonnage. Une unité de commande reçoit les signaux détectés par les sondes et conditionne ces derniers. Des traitements numériques appliqués aux signaux conditionnés, impliquant leur corrélation, une distribution temps-fréquence et une estimation du facteur de forme, permettent d'établir un diagnostic indiquant la détection d'une décharge partielle et sa localisation dans le matériel électrique.


Abrégé anglais




In order to detect, localize and interpret a partial discharge occurring in a
partial discharge site along an electrical equipment, two measurement probes
and a synchronization probe are installed along the electrical equipment. The
measurement probes detect pulses travelling in the electrical equipment while
the synchronization probe detects a phase angle in the electrical equipment
and is usable for calibration purposes. A control unit receives the signals
sensed by the probes and conditions them. Digital processings applied on the
conditioned signals, involving their correlation, a time-frequency
distribution and a form factor estimation, allows establishing a diagnosis
indicating a detection of a partial discharge and its localization along the
electrical equipment.


Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.


CLAIMS:

1. An apparatus for detecting, localizing and interpreting a partial discharge

occurring in a partial discharge site along an electrical equipment,
comprising:
two measurement probes and a synchronization probe installable along the
electrical equipment so that pulses travelling in the electrical equipment are

detectable by the measurement probes and a phase angle in the electrical
equipment is detectable by the synchronization probe;
a control unit connecting to the measurement probes for receiving signals
representative of the detected pulses, and connecting to the synchronization
probe
for acquiring a signal representative of the detected phase angle, the control
unit
having a circuit for selective conditioning of the received signals; and
a digital processing unit connecting to the control unit for acquiring the
signals after selective conditioning as a function of the detected phase angle
and
driving the control unit, the digital processing unit having a correlation
measuring
module for measuring correlation of the acquired signals, a module for
performing
a time-frequency distribution of at least one of the acquired signals, a form
factor
estimating module for estimating a form factor derived from the time-frequency

distribution, and a diagnosis module responsive to results generated by the
correlation measuring and form factor estimating modules for generating a
diagnosis indicative of a detection of a partial discharge and of its
localization
along the electrical equipment.
2. The apparatus according to claim 1, wherein the processing unit further
comprises a candidate eliminating module eliminating candidates of diagnosis
solutions corresponding to traces in the acquired signals derived from
detected
pulses having out-of-range propagation delays between the measurement probes.
3. The apparatus according to claim 2, wherein a threshold for delays
considered being out-of-range by the candidate eliminating module is settable
by a
user.



4. The apparatus according to claim 2, wherein the control unit comprises a
circuit for generating a test signal transmitted to the synchronization probe
that
injects it in the electrical equipment, the digital processing unit being apt,
from the
acquired signals corresponding to pulses detected by the measurement probes
caused by the test signal injected in the electrical equipment, to determine
the
propagation delay between the measurement probes, the threshold for delays
considered to be out-of-range being set as a function of the propagation delay
so
determined.
5. The apparatus according to claim 1, wherein the processing unit further
comprises a module for estimating a probability of error as a function of a
ratio
between a peak of a maximum of correlation among other correlation peaks, a
warning signal indicative of a second probable candidate of diagnosis
explanation
being transmitted to the diagnosis module when the probability of error
exceeds a
preset threshold.
6. The apparatus according to claim 1, wherein the processing unit further
comprises a module for detecting typical traces of radiation in the acquired
signals,
their processing being stopped and a "radiation" diagnosis being retained when
it
is established that the acquired signals correspond to radiation.
7. The apparatus according to claim 1, wherein the correlation measuring
module provides the diagnosis module with a signal indicative of the
polarities of
the pulses in the acquired signals, a correlation factor of the correlated
signals, a
temporal trace portion of a higher amplitude discharge, and a temporal
distance
between a same discharge sensed by the measurement probes.
8. The apparatus according to claim 7, wherein the processing unit further
comprises a module for estimating an equivalent bandwidth and a rise time of
the
higher amplitude discharge, both provided to the diagnosis module.
9. The apparatus according to claim 1, wherein the processing unit further
comprises a clusterization module upstream of the correlation measuring module

36

and the module performing the time-frequency distribution, for clusterizing
the
acquired signals into respective clusters and producing signatures
characterizing
the signals in the clusters, the correlation and the time-frequency
distribution being
achieved on the signatures.
10. A method for detecting, localizing and interpreting a partial discharge
occuring in a partial discharge site along an electrical equipment,
comprising:
detecting pulses travelling in the electrical equipment using two
measurement probes spaced from each other along the electrical equipment;
detecting a phase angle in the electrical equipment using a synchronization
probe positioned along the electrical equipment;
performing a selective conditioning of signals representative of the detected
pulses;
acquiring the signals after the selective conditioning as a function of the
detected phase angle;
putting the acquired signals in correlation;
presenting at least one of the acquired signals in a time-frequency
distribution;
estimating a form factor derived from the time-frequency distribution; and
establishing a diagnosis indicative of a detection of a partial discharge and
of its localization along the electrical equipment as a function of results
from the
correlation and the form factor.
11. The method according to claim 10, further comprising:
eliminating candidates of diagnosis solutions corresponding to traces in the
acquired signals derived from detected pulses having out-of-range propagation
delays between the measurement probes.
12. The method according to claim 11, further comprising:
generating a test signal transmitted to the synchronization probe that injects

it in the electrical equipment; and
determining the propagation delay between the measurement probes from
the acquired signals corresponding to the pulses detected by the measurement

37

probes caused by the test signal injected in the electrical equipment, the
threshold
for delays considered to be out-of-range being then set as a function of the
propagation delay so determined.
13. The method according to claim 10, further comprising:
generating a test signal transmitted to the synchronization probe that injects

it in the electrical equipment; and
checking a configuration of the measurement probes as a function of the
acquired signals corresponding to the test signal injected in the electrical
equipment.
14. The method according to claim 10, further comprising:
estimating a probability of error as a function of a ratio between a peak of a

maximum of correlation among other correlation peaks, a warning signal
indicative
of a second probable candidate of diagnosis explanation being produced when
the
probability of error exceeds a preset threshold.
15. The method according to claim 10, further comprising:
detecting typical traces of radiation in the acquired signals, their
processing
being stopped and a "radiation" diagnosis being retained when it is
established
that the acquired signals correspond to radiation.
16. The method according to claim 10, wherein the diagnosis is also
established based on a signal indicative of the polarities of the pulses in
the
acquired signals, a correlation factor of the correlated signals, a temporal
trace
portion of a higher amplitude discharge, a temporal distance between a same
discharge sensed by the measurement probes, an equivalent bandwidth and a rise

time of the higher amplitude discharge
17. The method according to claim 10, wherein the form factor correspond
to a ratio of a spectral bandwidth over a time length of a discharge pulse in
one of
the acquired signals, the spectral bandwidth and the time length being
estimated

38

from a prevailing spectral line and a temporal marginal of the partial
discharged
provided in a time-frequency distribution.
18. The method according to claim 17, wherein the time-frequency
distribution corresponds to a spectrogram, a Wigner-Ville transform, or to a
wavelet transform of said at least one acquired signal.
19. The method according to claim 17, wherein the time-frequency
distribution is first subjected to a time-frequency filtering prior to
estimation of the
form factor in order to remove background noise exhibiting a substantially
constant
spectral power in the time domain.
20. The method according to claim 10, further comprising:
interpolating the acquired signals before correlation.
21. The method according to claim 10, further comprising clusterizing the
acquired signals into respective clusters and producing signatures
characterizing
the signals in the clusters, the correlation and the time-frequency
distribution being
achieved on the signatures.
22. A wideband magnetic probe for detecting pulses traveling in an
electrical equipment caused by a partial discharge, comprising:
a removable clamp having a conductive loop forming a magnetic sensing
circuit apt to surround a section of the electrical equipment in order to
sense a
signal representing a magnetic component of the pulses traveling in the
electrical
equipment;
a conductive shield covering and electrostatically insulating the conductive
loop, the conductive shield being in open circuit at opposite ends of the
clamp so
that a gap appears between the ends of the clamp;
a connector closing the circuit of the conductive loop at the ends of the
clamp where the gap is located when the clamp is installed around the
electrical
equipment; and

39

a connector for establishing an external electrical connection with the
circuit
of the conductive loop.
23. The wideband magnetic probe according to claim 22, further comprising
an amplifier circuit integrated in the conductive shield and inserted in the
conductive loop in order to filter and amplify the signal.
24. The wideband magnetic probe according to claim 23, wherein the
amplifier circuit has a controlled gain.
25. An apparatus for detecting partial discharges in an electrical equipment,
comprising:
a measurement probe and a synchronization probe installable along the
electrical equipment so that pulses travelling in the electrical equipment are

detectable by the measurement probe and a signal indicative of a phase angle
in
the electrical equipment is detectable by the synchronization probe;
a control unit connecting to the measurement probe for receiving signals
representative of the detected pulses, and connecting to the synchronization
probe
for acquiring the signal indicative of the phase angle, the control unit
having a
circuit for selective conditioning of the received signals; and
a digital processing unit connecting to the control unit for acquiring the
signals after selective conditioning as a function of an appraisal of the
phase angle
and driving the control unit, the digital processing unit having a
clusterization
module for clusterizing the acquired signals into respective clusters and
producing
signatures characterizing the signals in the clusters, a module for performing
a
time-frequency distribution of the signatures, a form factor estimating module
for
estimating a form factor derived from the time-frequency distribution, a
module for
determining rise times of the signatures, and a diagnosis module responsive to

results generated by the form factor estimating module and the module for
determining rise times for generating a diagnosis indicative of a detection of
partial
discharges and producing a warning signal as a function of the diagnosis.


26. A method for detecting partial discharges in an electrical equipment,
comprising:
detecting pulses travelling in the electrical equipment using a measurement
probe positioned along the electrical equipment;
detecting a signal indicative of a phase angle in the electrical equipment
using a synchronization probe positioned along the electrical equipment;
performing selective conditioning of signal representative of the detected
pulses;
acquiring the signals after the selective conditioning as a function of an
appraisal of the phase angle;
clusterizing the acquired signals into clusters and producing signatures
characterizing the signals in the clusters;
presenting the signatures in a time-frequency distribution;
estimating a form factor derived from the time-frequency distribution;
determining rise times of the signatures;
establishing a diagnosis indicative of a detection of partial discharges as a
function of results from the form factor and the rise times; and
producing a warning signal as a function of the diagnosis.
27. An apparatus for detecting partial discharges in an electrical equipment,
comprising:
a measurement probe and a synchronization probe installable along the
electrical equipment so that pulses travelling in the electrical equipment are

detectable by the measurement probe and a signal indicative of a phase angle
in
the electrical equipment is detectable by the synchronization probe;
a control unit connecting to the measurement probe for receiving signals
representative of the detected pulses, and connecting to the synchronization
probe
for acquiring the signal indicative of the phase angle, the control unit
having a
circuit for selective conditioning of the received signals; and
a digital processing unit connecting to the control unit for acquiring the
signals after selective conditioning considering the phase angle and driving
the
control unit, the digital processing unit having a clusterization module for
clusterizing the acquired signals into respective clusters and producing time

41

signatures characterizing the signals in the clusters, a module for
determining
characteristic elements of the signatures, and a diagnosis module responsive
to
results generated by the module for determining characteristic elements for
generating a diagnosis indicative of a detection of partial discharges and
producing a warning signal as a function of the diagnosis.
28. A method for detecting partial discharges in an electrical equipment,
comprising:
detecting pulses travelling in the electrical equipment using a measurement
probe positioned along the electrical equipment;
detecting a signal indicative of a phase angle in the electrical equipment
using a synchronization probe positioned along the electrical equipment;
performing selective conditioning of signals representative of the detected
pulses;
acquiring the signals after the selective conditioning considering the phase
angle;
clusterizing the acquired signals into clusters and producing time signatures
characterizing the signals in the clusters;
determining characteristic elements of the signatures;
establishing a diagnosis indicative of a detection of partial discharges as a
function of results from the characteristic elements; and
producing a warning signal as a function of the diagnosis.

42


Une figure unique qui représente un dessin illustrant l’invention.

Pour une meilleure compréhension de l’état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , États administratifs , Taxes périodiques et Historique des paiements devraient être consultées.

États admin

Titre Date
(86) Date de dépôt PCT 2006-05-18
(87) Date de publication PCT 2006-11-23
(85) Entrée nationale 2007-11-13
Requête d'examen 2011-03-31
(45) Délivré 2014-04-15

Taxes périodiques

Description Date Montant
Dernier paiement 2017-04-20 250,00 $
Prochain paiement si taxe applicable aux petites entités 2018-05-18 125,00 $
Prochain paiement si taxe générale 2018-05-18 250,00 $

Avis : Si le paiement en totalité n’a pas été reçu au plus tard à la date indiquée, une taxe supplémentaire peut être imposée, soit une des taxes suivantes :

  • taxe de rétablissement prévue à l’article 7 de l’annexe II des Règles sur les brevets ;
  • taxe pour paiement en souffrance prévue à l’article 22.1 de l’annexe II des Règles sur les brevets ; ou
  • surtaxe pour paiement en souffrance prévue aux articles 31 et 32 de l’annexe II des Règles sur les brevets.

Historique des paiements

Type de taxes Anniversaire Échéance Montant payé Date payée
Dépôt 400,00 $ 2007-11-13
Taxe périodique - Demande - nouvelle loi 2 2008-05-20 100,00 $ 2007-11-13
Taxe périodique - Demande - nouvelle loi 3 2009-05-19 100,00 $ 2009-05-11
Taxe périodique - Demande - nouvelle loi 4 2010-05-18 100,00 $ 2010-04-27
Requête d'examen 200,00 $ 2011-03-31
Taxe périodique - Demande - nouvelle loi 5 2011-05-18 200,00 $ 2011-04-21
Taxe périodique - Demande - nouvelle loi 6 2012-05-18 200,00 $ 2012-04-26
Taxe périodique - Demande - nouvelle loi 7 2013-05-21 200,00 $ 2013-05-03
Final 300,00 $ 2014-01-23
Taxe périodique - brevet - nouvelle loi 8 2014-05-20 200,00 $ 2014-04-22
Taxe périodique - brevet - nouvelle loi 9 2015-05-19 200,00 $ 2015-04-23
Taxe périodique - brevet - nouvelle loi 10 2016-05-18 250,00 $ 2016-04-22
Taxe périodique - brevet - nouvelle loi 11 2017-05-18 250,00 $ 2017-04-20

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Filtre Télécharger sélection en format PDF (archive Zip)
Description du
Document
Date
(yyyy-mm-dd)
Nombre de pages Taille de l’image (Ko)
Revendications 2007-11-13 7 303
Abrégé 2007-11-13 2 75
Dessins représentatifs 2007-11-13 1 8
Description 2007-11-13 34 1 592
Dessins 2007-11-13 18 538
Dessins 2007-11-14 18 471
Description 2007-11-14 34 1 593
Page couverture 2008-02-06 1 43
Revendications 2011-04-12 8 349
Description 2011-04-12 36 1 639
Description 2013-07-02 36 1 636
Dessins représentatifs 2014-03-17 1 8
Page couverture 2014-03-17 1 44
PCT 2007-11-13 5 157
PCT 2007-11-14 13 574
Poursuite-Amendment 2011-03-31 1 35
Poursuite-Amendment 2011-04-12 8 235
Poursuite-Amendment 2013-06-21 2 52
Poursuite-Amendment 2013-07-02 3 53
Correspondance 2014-01-23 1 37