Abrégé

Disclosed in the present invention are an improved oversampling-based power transmission line fault classification system and method. The method of the present invention comprises: first, by using historical fault information of State Grid as a database, obtaining a plurality of sub-datasets by means of division based on fault types, each sub-dataset consisting of transient current traveling waves at power transmission line fault moments; then, using a K-means method to perform clustering operation on minority classes of a fault dataset, and using BSMOTE to perform oversampling, so as to achieve balancing of various classes, thus forming a balanced dataset; then, calculating time domain and frequency domain features of transient current traveling waves in the balanced dataset, so as to form a feature dataset; finally, on the basis of CNN and SVM deep learning algorithms, establishing a classification model and training same by using the feature dataset, so as to obtain a trained fault classification model; and using the trained fault classification model to classify and identify faults. The method is highly accurate and effective, and can effectively extract fault feature quantities and quickly and accurately classify faults.

Classes IPC  ?

• G01R 31/08 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux

Abrégé

The present invention relates to the technical field of power transmission and distribution monitoring. Disclosed are a method for performing condition monitoring and active protection of an oil-filled transformer. Combustible gas content data of measuring points in a tested oil-filled transformer is acquired by means of a plurality of channels, it is determined whether an internal fault has occurred, and tripping protection is performed, increasing the reliability of operation of the oil-filled transformer. Further provided are a non-transient readable recording medium storing a program for performing condition monitoring and active protection of an oil-filled transformer, and a data processing system comprising the medium. The program can be called by means of a processing circuit to execute the method above, thus the present invention is suitable for being popularized and used in device state detection in the power industry.

Classes IPC  ?

• H02H 7/04 - Circuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour transformateurs
• H02H 1/00 - Détails de circuits de protection de sécurité

Abrégé

The present invention belongs to the technical field of lightning protection of power transmission lines, and in particular, relates to a method for limiting lightning overvoltage of a direct-current power transmission line. By means of using operation date of a line itself, lightning current monitoring data, and parameters of an environment where the line is located, a line dynamic operation function curve and a line lightning-protection performance function curve are both corrected to obtain a more realistic voltage difference, thus achieving reliable protection actions and state sensing of a lightning arrester on the line. An apparatus for limiting a lightning overvoltage of a direct-current power transmission line is further provided in the present invention to cooperate with the implementation of the method.

Classes IPC  ?

• H02H 9/04 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de tension
• H01C 8/04 - Résistances de protection contre les surtensionsParafoudres

Abrégé

The present invention relates to the technical field of electrical detection, and provides a high-voltage cable defect detection method, a detection system, an electronic device, and a storage medium. According to the defect detection method, properties of a wavelength change in a spectral signal and precipitation of a characteristic gas caused by a temperature rise of a water-blocking buffer layer in a high-voltage cable due to an ablation defect are utilized. The spectral signal is detected so as to determine the presence of a defect in a first target paragraph, then a gas of the first target paragraph is sampled and analyzed, and a degree of the ablation defect is determined on the basis of compositions and content amplitude of a gas signal. A position where the ablation defect appears is located and detected by using a non-electrical characteristic quantity, so that the influence of electromagnetic interference on a detection instrument and device can be avoided, an operator does not need to perform imaging detection on the high-voltage cable along an entire path, and the field adaptability and accuracy of the detection of an ablation defect of the water-blocking buffer layer in the high-voltage cable can be effectively improved.

Classes IPC  ?

• G01N 21/25 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes
• G01N 21/88 - Recherche de la présence de criques, de défauts ou de souillures
• G01N 33/00 - Recherche ou analyse des matériaux par des méthodes spécifiques non couvertes par les groupes

Abrégé

The present invention belongs to the technical field of lightning protection of power transmission lines, and in particular, relates to a method for limiting a lightning overvoltage of a direct-current power transmission line. By means of using operation data of a line itself, lightning current monitoring data, and parameters of an environment where the line is located, a line dynamic operation function curve and a line lightning-protection performance function curve are both corrected to obtain a more realistic voltage difference, thus achieving reliable protection actions and state sensing of a lightning arrester on the line. An apparatus for limiting a lightning overvoltage of a direct-current power transmission line is further provided in the present invention to cooperate with the implementation of the method, and further provided are a non-transient readable recording medium, which stores a program for the method, and a system, which includes the medium, wherein the program can be called by means of a processing circuit, so as to execute the method.

Classes IPC  ?

• H02H 9/04 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de tension

Abrégé

A lightning locating optimization method that corrects the effects of topological and geological parameters on lightning electromagnetic wave propagation, a system, and a medium. The method comprises: carrying out gridding on areas surrounding lightning detection stations participating in lightning locating, and utilizing a ground and ionosphere electromagnetic wave propagation model to simulate and calculate parametric correction coefficients and delay correction values of lightning electromagnetic waves propagating from an initial location of a lightning strike to lightning detection stations with and without taking into account topological and geological parameters when each lattice point is set as the initial location of the lightning strike; separately finding the parametric correction coefficients and the delay correction value of each lightning detection station from a parametric correction coefficient table and a delay correction table corresponding to the lightning detection stations participating in lightning locating when the nearest lattice point serves as the site of the lightning strike, separately performing correction on the participating lightning detection stations, obtaining corrected feature parameters and a corrected waveform arrival time corresponding to each lightning detection station, and calculating precise feature parameters of the lightning and the precise location of the lightning.

Classes IPC  ?

• G01R 29/08 - Mesure des caractéristiques du champ électromagnétique
• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

The present invention provides a remote monitoring system for oil and gas in a high-voltage bushing, comprising a hydrogen-temperature-pressure integrated sensor, a data access device, an intelligent remote transmission device, and a remote monitoring platform. The hydrogen-temperature-pressure integrated sensor is used for collecting monitoring data of dissolved hydrogen, temperature and pressure in the high-voltage bushing in real time and sending the monitoring data to the data access device; the data access device sends the received monitoring data to the intelligent remote transmission device; the intelligent remote transmission device sends the monitoring data to the remote monitoring platform; the remote monitoring platform identifies the state of the high-voltage bushing according to the monitoring data, generates a control instruction, and sends the control instruction to the intelligent remote transmission device; the intelligent remote transmission device sends the control instruction to the hydrogen-temperature-pressure integrated sensor; and the hydrogen-temperature-pressure integrated sensor performs an early-warning operation or an alarm operation according to the control instruction. The present invention implements on-line monitoring of the multi-detection amount of oil and gas in the high-voltage bushing without power failure, improving the monitoring efficiency and convenience.

Classes IPC  ?

• H04L 67/125 - Protocoles spécialement adaptés aux environnements propriétaires ou de mise en réseau pour un usage spécial, p. ex. les réseaux médicaux, les réseaux de capteurs, les réseaux dans les véhicules ou les réseaux de mesure à distance en impliquant la commande des applications des terminaux par un réseau
• H04Q 9/00 - Dispositions dans les systèmes de commande à distance ou de télémétrie pour appeler sélectivement une sous-station à partir d'une station principale, sous-station dans laquelle un appareil recherché est choisi pour appliquer un signal de commande ou pour obtenir des valeurs mesurées
• H04W 4/38 - Services spécialement adaptés à des environnements, à des situations ou à des fins spécifiques pour la collecte d’informations de capteurs
• G01D 21/02 - Mesure de plusieurs variables par des moyens non couverts par une seule autre sous-classe

Abrégé

A method for developing an epoxy resin impregnated glass fiber Direct Current (DC) bushing, comprising: according to length parameters of each layer of capacitive screen or resistive screen designed depending on insulation requirements, selecting bushing design parameters, determining a winding machine program according to the bushing design parameters, and winding a core body according to the winding machine program, wherein during the core body winding process, the core body begins to be initially cured; after the core body is wound, curing the core body by an oven according to a preset oven temperature and duration; machining the cured core body according to a preset core body design drawing; after the inner wall of a flange is polished and cleaned and is heated and pretreated by the oven, injecting glue at the position of a glue injection hole of the flange for gluing the core body and the flange; sequentially assembling a collector ring, a hollow composite insulator, and a voltage-equalizing sealing cover on the glued core body, and mounting a conducting rod, a wiring board, and a voltage-equalizing ball; and performing various tests on the bushing according to a preset bushing standard for a DC system.

Classes IPC  ?

• H01B 17/42 - Moyens pour obtenir une distribution améliorée de la tensionProtection contre la décharge en arc
• H01B 17/58 - Tuyaux, manchons, perles isolantes ou bobines au travers desquels passe le conducteur
• H01B 17/64 - Corps isolants combinés avec des éléments conducteurs mélangés, insérés ou en couches
• H01B 19/00 - Appareils ou procédés spécialement adaptés à la fabrication d'isolateurs ou de corps isolants

Abrégé

A vibration-signal-based online monitoring system for GIL defects, and a method. The monitoring system comprises a vibration signal collection module (1), a vibration signal feature extraction module (2), a device defect identification module (3) and a data storage display module (4), wherein the vibration signal collection module (1) is used for collecting a GIL housing vibration signal; the vibration signal feature extraction module (2) is used for extracting feature parameters of a vibration signal in three aspects, i.e. a time domain and/or a frequency domain and/or a time-frequency domain; and the device defect identification module (3) is used for identifying whether there is a defect in a GIL, identifying a defect type, and storing feature parameters of the vibration signal that cannot be identified and a corresponding device state in the data storage display module (4). By means of the system, not only can online monitoring and live detection be performed on the state of a GIL during the running process without a power failure, the running state of the GIL can also be analyzed and an alarm can also be given in real time, and database updating can also be performed according to a newly added defect type during the running process of the GIL, thereby improving the accuracy of GIL defect identification.

Classes IPC  ?

• G01H 1/00 - Mesure des vibrations dans des solides en utilisant la conduction directe au détecteur

Abrégé

coocc, and a known line length to represent the position of a fault point. Also provided are a non-transitory readable recording medium storing a power transmission line fault positioning program, and an apparatus containing the medium. By means of a processing circuit, the program can be invoked to execute the method, and the method is suitable for solving the problem of positioning a fault point of a hidden line.

Classes IPC  ?

• G01R 31/11 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux en utilisant des méthodes de réflexion d'impulsion

Abrégé

An artificial intelligence fault identification method for a power transmission line transient waveform, mainly comprising the following steps: performing manual annotation of a fault type on an original waveform signal to generate a data tag, and establishing a power transmission line transient waveform fault sample library; completing preprocessing a power transmission line transient waveform signal on the basis of a sliding window method to obtain corresponding sequence image data; constructing a deep learning model to realize the power transmission line transient waveform identification; performing parameter training and tuning on the deep learning model; and performing performance testing on the deep learning model, and completing targeted optimization to improve the performance. In this way, rapid, accurate, and reliable power transmission line transient waveform identification is realized. In addition, also disclosed is an artificial intelligence fault identification system for a power transmission line transient waveform for realizing the method. The system comprises a signal preprocessing module, a manual annotation module, a waveform identification module, a training and tuning module, and a performance testing and optimization module.

Classes IPC  ?

• G01R 31/08 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux
• G06N 3/08 - Méthodes d'apprentissage

Abrégé

A method for developing an epoxy resin impregnated glass fiber DC bushing, comprising: according to length parameters of each layer of capacitive screen or resistive screen designed depending on insulation requirements, selecting bushing design parameters, determining a winding machine program according to the bushing design parameters, and winding a core body according to the winding machine program, wherein during the core body winding process, the core body begins to be initially cured; after the core body is wound, curing the core body by an oven according to a preset oven temperature and duration; machining the cured core body according to a preset core body design drawing; after the inner wall of a flange is polished and cleaned and is heated and pretreated by the oven, injecting glue at the position of a glue injection hole of the flange for gluing the core body and the flange; sequentially assembling a collector ring, a hollow composite insulator, and a voltage-equalizing sealing cover on the glued core body, and mounting a conducting rod, a wiring board, and a voltage-equalizing ball; and performing various tests on the bushing according to a preset bushing standard for a DC system.

Classes IPC  ?

• H01B 19/00 - Appareils ou procédés spécialement adaptés à la fabrication d'isolateurs ou de corps isolants
• H01B 17/58 - Tuyaux, manchons, perles isolantes ou bobines au travers desquels passe le conducteur
• H01B 17/64 - Corps isolants combinés avec des éléments conducteurs mélangés, insérés ou en couches
• H01B 17/42 - Moyens pour obtenir une distribution améliorée de la tensionProtection contre la décharge en arc

Abrégé

Provided is a method for limiting lightning-strike flashover of a DC electricity transmission line, comprising: detecting a first event, the first event being characterized as an event in which an electricity transmission line is struck by lightning (S201); an isolation device which controls a lightning-strike flashover limiter being in an abnormal state (S202), the abnormal state being a state in which the isolation device is broken down by lightning; when the isolation device is in an abnormal state, a protection circuit which controls the lightning-strike flashover limiter is in a state of low resistance (S203), and at least the majority of the energy generated by the lightning strike is released by means of the protection circuit in the low-resistance state (S204).

Classes IPC  ?

• H01T 1/16 - Résistances en série associées par construction avec l'éclateur
• H01C 7/12 - Résistances de protection contre les surtensionsParafoudres
• H02H 3/22 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion sensibles à un excès de tension de courte durée, p. ex. foudre

Abrégé

A lightning prediction method, comprising the following steps: obtaining basic meteorological parameters of an area to be predicted; calculating high-order meteorological parameters related to lightning based on the high-order meteorological parameters of said area; obtaining lightning positioning observation data of said area, and performing grid processing on the lightning positioning observation data; based on a random forest algorithm, calculating the degree of correlation between each high-order meteorological parameter and lightning, and selecting the high-order meteorological parameter with the highest degree of correlation to lightning; establishing a forecasting model by utilizing an XGBoost algorithm based on the forecasting timeliness and the forecasting time; and based on the high-order meteorological parameters of said area, predicting the spatial distribution and occurrence probability of lightning by utilizing the prediction model.

Classes IPC  ?

• G06Q 10/04 - Prévision ou optimisation spécialement adaptées à des fins administratives ou de gestion, p. ex. programmation linéaire ou "problème d’optimisation des stocks"
• G01W 1/10 - Dispositifs pour la prévision des conditions météorologiques

Abrégé

An LoRaWAN-based electric transmission line monitoring device and system. The device comprises: a state collecting unit, a control unit, and a communication unit. The state collecting unit is used for collecting line environment data, and transmitting the line environment data to the control unit; the control unit obtains a control instruction according to the line environment data, and sends the control instruction to the communication unit; and the communication unit communicatively transmits the line environment data on the basis of an LoRaWAN protocol.

Classes IPC  ?

• G01D 21/02 - Mesure de plusieurs variables par des moyens non couverts par une seule autre sous-classe

Abrégé

Disclosed are a method and system for determining an insulation state of a direct current cable, and a storage medium. The method comprises: acquiring an electrical signal of a cable (S101); acquiring a feature parameter according to the electrical signal (S102); acquiring a feature parameter weight (S103); and determining an insulation state of the cable according to the feature parameter and the feature parameter weight (S104).

Classes IPC  ?

• G01R 31/12 - Test de la rigidité diélectrique ou de la tension disruptive
• G01R 31/08 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux

Abrégé

Disclosed in the present disclosure is an energy storage system active frequency modulation closed-loop control method. The method comprises frequency modulation output power control and energy storage battery charge state control, which are correlated and work collaboratively.

Classes IPC  ?

• H02J 3/32 - Dispositions pour l'équilibrage de charge dans un réseau par emmagasinage d'énergie utilisant des batteries avec moyens de conversion
• H02J 3/24 - Dispositions pour empêcher ou réduire les oscillations de puissance dans les réseaux

Abrégé

The present invention relates to the field of electrical technology, and more particularly, to an on-site test method and system for no-load/load loss of a vehicle-mounted power transformer. The on-site test method uses an on-site test system for no-load/load loss of a vehicle-mounted power transformer. The on-site test system comprises: a test system and a side-open carriage. The test system is located in the side-open carriage. The test system comprises: a test connection end for connecting a transformer under test, a power supply device for providing a test voltage to the transformer under test, a measurement instrument for obtaining measurement data of the transformer under test, and a measurement control device for controlling the measurement instrument. The power supply device, the measurement instrument, and the measurement control device are all located on a test circuit where a test connection end is located. The input end of the power supply device is connected to a power supply at a test site. By means of the present invention, on-site test for no-load and load of a large power transformer can be implemented.

Classes IPC  ?

• G01R 21/06 - Dispositions pour procéder aux mesures de la puissance ou du facteur de puissance par mesure du courant et de la tension
• G01R 31/00 - Dispositions pour tester les propriétés électriquesDispositions pour la localisation des pannes électriquesDispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs

Abrégé

A transmission line lightning monitoring and early warning method based on a small radar, comprising the following steps: step 1. obtaining multi-layer radar echo reflectivity data of a small radar; step 2. determining real lightning clouds; step 3. finding out a boundary in an image segmentation mode, and drawing a thunderstorm area; step 4. obtaining the echo radial speed corresponding to the thunderstorm area in step 1, tracking multiple times of volume scanning, deducing the tangential development speed of the area, and calculating the movement direction and speed of the thunderstorm area; step 5. estimating the lightning activity intensity of a position where thunderstorm appears at a future time K; and step 6. matching a thunderstorm prediction area according to the coordinates of a transmission line tower, considering the lightning withstand level of the tower, and giving an alarm. By combining a millimeter wave radar and a lightning positioning instrument, the method has the advantages of wide monitoring range and high accuracy. In the process of risk early warming of the lightning to the line tower, the intensity of the lightning and the withstand level of the line tower are considered, and thus the risk early warning is close to reality, and the precision is high.

Classes IPC  ?

• G01S 13/95 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour la météorologie
• G01R 29/033 - Indication de ce qu'une caractéristique d'impulsion est, soit supérieure ou inférieure à une valeur prédéterminée, soit à l'intérieur ou à l'extérieur d'une plage de valeurs prédéterminée indiquant le nombre de fois que le phénomène se produit
• G08B 21/10 - Alarmes pour assurer la sécurité des personnes réagissant aux événements désastreux, p. ex. les tornades ou les tremblements de terre

Abrégé

A small radar-based thunder and lightning monitoring and warning method for an electric transmission line, and a computer storage medium. The small radar-based thunder and lightning monitoring and warning method for an electric transmission line comprises the following steps: step 1, obtaining multilayer radar echo reflectivity data of a small radar and obtaining thunder occurrence data by means of a thunder and lightning locator; step 2, determining a thunderstorm region according to the echo reflectivity data and the thunder occurrence data; step 3, determining the movement direction and velocity of the thunderstorm region; step 4, estimating the position of a thunderstorm that occurs in a further time point k and the thunder and lightning activity intensity according to the movement direction and velocity of the thunderstorm region; and step 5, determining whether a pole and a tower of an electric transmission line are located in the position of the thunderstorm that occurs in the further time point k, generating a determining result, and determining whether to generate an alarm according to the determining result.

Classes IPC  ?

• G01S 13/95 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour la météorologie
• G01R 29/033 - Indication de ce qu'une caractéristique d'impulsion est, soit supérieure ou inférieure à une valeur prédéterminée, soit à l'intérieur ou à l'extérieur d'une plage de valeurs prédéterminée indiquant le nombre de fois que le phénomène se produit
• G08B 21/10 - Alarmes pour assurer la sécurité des personnes réagissant aux événements désastreux, p. ex. les tornades ou les tremblements de terre

Abrégé

A securing apparatus for an optical fibre temperature measurement probe of an oil-immersed transformer, comprising an insulating pad block (1) arranged between the transformer coils, a strip-shaped clamping groove hole (12) matching an optical fibre temperature measurement probe assembly (2) being arranged on the insulating pad block (1), a limiting round hole (11) having a diameter larger than that of the clamping groove hole (12) being arranged on the strip-shaped clamping groove hole (12); the optical fibre temperature measurement probe assembly (2) comprises a transmission optical fibre and an optical fibre temperature measurement probe (24) connected to the end part of the transmission optical fibre, the transmission optical fibre and the optical fibre temperature measurement probe (24) being arranged in sequence in the strip-shaped clamping groove hole (12), the part of the transmission optical fibre corresponding to the limiting round hole (11) being provided with a limiting protrusion matching the limiting round hole (11), the limiting protrusion fitting to the limiting round hole (11) to restrict the axial movement of the optical fibre temperature measurement probe assembly (2).

Classes IPC  ?

• G01K 1/14 - SupportsDispositifs de fixationDispositions pour le montage de thermomètres en des endroits particuliers
• G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques
• H01F 27/40 - Association structurelle de composants électriques incorporés, p. ex. fusibles

Abrégé

The present invention relates to the technical field of impulse voltage generators, in particular referring to a multi-layer compact reciprocal non-inductive resistor. The multi-layer compact reciprocal non-inductive resistor comprises a resistance insulating barrel and resistance wires. An inductance adjusting area is arranged at the end of the resistance insulating barrel, and resistance wire winding grooves and resistance transposition grooves are provided on the resistance insulating barrel. The resistance wires are wound in the resistance wire winding grooves and the resistance transposition grooves in a matched manner. The present invention is mainly used in a closed compact-type impacting device and is surrounded by gas having high insulating property, and therefore the spacing between resistance grooves can be very small. The resistor uses a multi-layer winding structure, fully utilizes the space of the insulating barrel, and reduces the overall length of the resistor. An insulation ring is arranged between each layer of the resistance wire to ensure the insulation strength of each layer. The number of the resistance grooves for winding the resistor is an even number. The winding direction of each layer of resistor is opposite, and the winding directions of adjacent resistance discs are opposite. Certain adjustment grooves are reserved for adjusting the inductance generated during resistor winding process, in order to reduce the residual inductance to the minimum.

Classes IPC  ?

• H01C 3/02 - Résistances métalliques fixes en fil ou en ruban, p. ex. bobinées, tressées ou en forme de grille disposées ou structurées en vue de réduire la self-induction, la capacité ou la variation en fonction de la fréquence
• H01C 3/16 - Résistances métalliques fixes en fil ou en ruban, p. ex. bobinées, tressées ou en forme de grille l'élément résistif étant formé de plusieurs spires ou boucles enroulées en spirale, en hélice ou en forme de tore comprenant plusieurs éléments enroulés distincts ou plusieurs configurations d'enroulement

Abrégé

A digital measurement system for measuring a lightning electric field change signal, and a measurement method thereof. The system comprises at least a planar antenna (1), an electric field analog-to-digital conversion module (4), and a digital signal processing module (5). The input end of the electric field analog-to-digital conversion module (4) is connected to the planar antenna (1), and the output end of the electric field analog-to-digital conversion module (4) is connected to the digital signal processing module (5). The planar antenna (1) is used for detecting a field change signal generated by lightning and transmitting the field change signal to the electric field analog-to-digital conversion module (4). The electric field analog-to-digital conversion module (4) is used for processing and converting the electric field change signal, to obtain a digital lightning electric field change signal and transmit the digital lightning electric field change signal to the digital signal processing module (5). The digital signal processing module (5) is used for: triggering collection, processing of the digital lightning electric field change signal, to obtain a lightning electric field rapid change signal, a lightning electric field slow change signal, and a lightning electric field original signal, storing the signals, and combining the signals into data frames for external communication. The measurement system and the measurement method thereof can implement measurement of rapid and slow changes of a lightning electric field with low costs and high efficiency.

Classes IPC  ?

• G01R 29/08 - Mesure des caractéristiques du champ électromagnétique

Abrégé

A vehicle-mounted electric vehicle rechargeable emergency rescue vehicle based on a shaft power-take-off generator comprises the shaft power-take-off generator, a vehicle-mounted alternating-and-direct-current quick-and-slow-charging integrated device, a vehicle-mounted storage battery, a power switching module and a to-be-charged electric vehicle. The power switching module is equipped with a shaft power-take-off generator access port and an external mains supply access port. The vehicle-mounted alternating-and-direct-current quick-and-slow-charging integrated device comprises a rectification module, a two-way voltage regulation module and an inversion module. When the rechargeable emergency rescue vehicle is in an idle state, the vehicle-mounted storage battery accesses a mains supply to be charged until the vehicle-mounted storage battery is fully charged. When the rechargeable emergency rescue vehicle is in a charging state and if the rescue vehicle is a sedan, only the vehicle-mounted storage battery is adopted for charging; when the rescue vehicle is a medium bus or a large bus, the vehicle-mounted storage battery and the shaft power-take-off generator are adopted for combined charging. With the adoption of the rechargeable emergency rescue vehicle, the problems existing in rechargeable diesel vehicles that are excessively large in size and high in noise and cannot charge storage batteries during running are effectively solved, and the energy recovery at different rotating speeds output by the vehicle is realized.

Classes IPC  ?

• H02J 7/02 - Circuits pour la charge ou la dépolarisation des batteries ou pour alimenter des charges par des batteries pour la charge des batteries par réseaux à courant alternatif au moyen de convertisseurs
• H02J 7/14 - Circuits pour la charge ou la dépolarisation des batteries ou pour alimenter des charges par des batteries pour la charge de batteries par des générateurs dynamo-électriques entraînés à vitesse variable, p. ex. sur véhicule

Abrégé

A lightning protection structure of an overhead high voltage transmission line, consisting of a composite material cross arm (1), an energized conductor (2), a grounding conductor (3) and a discharging gap h; the energized conductor (2) is a straight metal tube with one end being secured to a tower (4); the grounding conductor (3) is a straight metal tube formed into an L shape with one end being secured on a high voltage terminal fitting of the composite material cross arm (1); the discharging gap h is formed between a suspended end of the energized conductor (2) and a suspended end of the grounding conductor (3); the composite material cross arm (1), the grounding conductor (3) and the energized conductor (2) are on the same plane, the plane being parallel to the horizontal plane, or the high voltage end tilts upward to form an angle not greater than 30° with the horizontal plane. The lightning protection structure can effectively avoid lightning accidents caused to the overhead high voltage transmission line, improve anti-pollution flashover, anti-icing flashover levels of the line, decrease the height of the towers, and reduce the width of line corridor, thus saving line construction costs.

Classes IPC  ?

• H02G 13/00 - Installations de paratonnerresFixation de ceux-ci à leur structure de support

Abrégé

An automatic unfolding type on-site calibration vehicle for high-voltage transformers comprises a cab (1), a carriage (2) and an electric transformer calibration system. A mobile carriage (3) provided with a rear door (4) is arranged at the rear part of the carriage (2); an accommodating space between the carriage (2) and the mobile carriage (3) comprises a test area (2a) and an operating area (2b); a control cabinet (5) is installed in the operating area (2b); a mobile platform (6) is installed in the test area (2a). The electric transformer calibration system comprises a voltage transformer calibrating apparatus (7) comprising a testing transformer and standard voltage transformer assembly (7a) and a compensation reactor (7b) that are installed on the mobile platform (6), a transformer calibrator (7c), a voltage load box (7d) and a voltage regulator (7e) that are installed in the control cabinet (5). The testing transformer and standard voltage transformer assembly (7a) comprises a horizontal testing transformer (7a1), a horizontal standard voltage transformer (7a2) and an insulating bush (7a4) provided with a grading ring (7a3). The horizontal standard voltage transformer (7a2) is installed at the top of the horizontal testing transformer (7a1), and the insulating bush (7a4) is obliquely installed at the end of the horizontal testing transformer (7a1). The calibration vehicle solves the problem of low working efficiency resulted from the need to adjust the position between the mobile platform and the product to be tested, avoids the problems of time wasting on rail abutment, bad reliability and the rear door being prone to compression deformation, shortens the overall length of the calibration vehicle, and reduces the overall height of the calibration vehicle.

Classes IPC  ?

• B60P 3/00 - Véhicules adaptés pour transporter, porter ou comporter des charges ou des objets spéciaux
• G01R 35/02 - Test ou étalonnage des appareils couverts par les autres groupes de la présente sous-classe des dispositifs auxiliaires, p. ex. des transformateurs pour appareils en fonction du rapport de transformation, de l'angle de phase ou de la puissance à l'utilisation
• G01R 31/00 - Dispositions pour tester les propriétés électriquesDispositions pour la localisation des pannes électriquesDispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs

Abrégé

A method for controlling the load of a transformer based on a hot spot temperature measured by using the fibre grating technology. In the production process of a transformer, fibre grating sensors (6) are arranged on the upper part of an internal winding (1) of the transformer, in the position of a leading wire and on the upper part of an iron core (5), and the control of a cooler of the transformer is directed by using real-time temperature data measured by the fibre grating sensors (6). In this method, the fibre grating sensors (6) are used to monitor the internal hottest spot temperature of the transformer to conduct the cooling control of the transformer, so that the control of a cooling system of the transformer can be conducted effectively in accordance with the operation state of the transformer itself and the influence of the external environment, thereby achieving the purpose of avoiding the generation of faults or the acceleration of insulation ageing caused by the high temperature in the transformer.

Classes IPC  ?

• G05D 23/19 - Commande de la température caractérisée par l'utilisation de moyens électriques
• H01F 27/08 - RefroidissementVentilation
• G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques
• H01F 41/00 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques

Abrégé

A method for predicting the life of a transformer based on a fibre grating temperature measurement system. The method comprises: conducting a quasi-distributed description on an internal temperature of a transformer by using a fibre grating temperature measurement system; determining the position of an internal hottest spot of the transformer and conducting a life evaluation on an internal local region of the transformer; and according to the life loss of each position of the transformer, by combining the insulation characteristic of the transformer with the influence of the life of the position on the entire life of the transformer, predicting the life of the transformer scientifically and reasonably. The method can use the fibre grating temperature measurement system to calculate and evaluate the life loss of the internal insulation of the transformer and the rate of change thereof, thereby directing the operation and maintenance department to scientifically, safely and reliably improve the operation and maintenance policy of the transformer.

Classes IPC  ?

• G01R 31/00 - Dispositions pour tester les propriétés électriquesDispositions pour la localisation des pannes électriquesDispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs
• G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques

Abrégé

The present invention discloses a point-type high-voltage power transmission line optical fiber detection network, comprising a substation control unit, a first wavelength-division multiplexer, a second wavelength-division multiplexer, a third wavelength-division multiplexer, and two base tower monitoring subsystems; the substation control unit comprising a communications control module, an optical signal demodulation module, and a fourth wavelength-division multiplexer; each base tower monitoring subsystem comprising a first optical path selection switch, a second optical path selection switch, a third optical path selection switch, an optical-to-electrical conversion module, a controller, a first electrical-to-optical conversion module, a second electrical-to-optical conversion module, and a tower status sensor array. The present invention improves accuracy in detecting wire vibration due to breeze, wire temperature, and tower angle of inclination in high-voltage power transmission lines, and improves efficiency in detecting the described parameters.

Classes IPC  ?

• H04J 14/02 - Systèmes multiplex à division de longueur d'onde
• G08C 23/06 - Systèmes de transmission de signaux non électriques, p. ex. systèmes optiques utilisant des ondes lumineuses, p. ex. infrarouges à travers des guides de lumière, p. ex. des fibres optiques

Abrégé

An inverted-type electric field instrument having low power consumption and a constant speed. The electric field instrument comprises a housing (1), a motor (3), a fixed disk (4), a fixed disk cover (6), a static sheet (8), and a moving sheet (9). The fixed disk (4) and the fixed disk cover (6) are provided inside the housing (1). The motor (3) is further provided inside the housing (1), and the motor (3) comprises a motor shaft. The motor shaft passes through the fixed disk (4) and the fixed disk cover (6), the static sheet (8) is connected to the motor shaft through an insulating plastic piece (7), and a cylindrical column (10) is sleeved at the bottom of the motor shaft. The moving sheet (9) is connected to the cylindrical column (10). The electric field instrument further comprises an electric field signal filtering circuit, an electric field signal polarity determining circuit, a motor control module, and a power supply unit. No positioning bracket, small blade, or photoelectric switch is comprised inside the housing of the electric field instrument, so that processing, fabrication, and assembly steps for the electric field instrument are simplified, the complexity of a signal processing circuit is lowered, and the overall volume of the electric field instrument is reduced.

Classes IPC  ?

• G01R 29/12 - Mesure du champ électrostatique
• G01W 1/16 - Mesures du gradient de potentiel électrique de l'atmosphère, p. ex. dû aux charges électriques dans les nuages

Abrégé

A method and device for monitoring a gas in transformer oil online. According to the method, delivery calibration is performed on a standard oil sample through a delivery test, delivery calibration data of a specific standard gas is recorded, and a standard gas correction coefficient is generated, and a drift of a gas detector is corrected and reduced by comparing and correcting an onsite chromatographic peak height test of a same standard gas with a delivery record. The present invention can improve the stability of an online monitoring system for a gas in the transformer oil, and ensures secure and stable operation of a transformer.

Classes IPC  ?

• G01N 33/28 - Huiles
• G01N 30/02 - Chromatographie sur colonne

Abrégé

A making method for pre-embedding a fiber grating sensor in a magnetic wire, includes: employing a magnetic wire (9) with a slot; enabling the fiber grating sensor (2) to pass through a fiber payingoff wheel (3); and enabling the fiber grating sensor (2) and the magnetic wire (9) with the slot to enter into an oil injection device(4) and to pass through a guide device (5) together, so as to position the fiber grating sensor (2) in the slot of the magnetic wire; then carrying out insulation paper lapping and forming by a paper lapping device (6); conveying the formed product to a wire takeup device (8) through a traction device (7); finally obtaining the magnetic wire pre-embedded with the fiber grating sensor (2). An integrated system for pre-embedding a fiber grating sensor in a magnetic wire is also provided. The making method and the integrated system for pre-embedding the fiber grating sensor in the magnetic wire have the advantages of simple preparation process and excellent pre-embedding effect. The magnetic wire pre-embedded with the fiber grating sensor has favorable temperature sensing property and is not influenced by stress. By connecting a plurality of fiber grating sensors to a single optical fiber in series and forming a quasi-distributed sensing network by the use of a multiplexing technology, the direct measurement of temperature inside the magnetic wire is realized.

Classes IPC  ?

• G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques
• H01B 13/00 - Appareils ou procédés spécialement adaptés à la fabrication de conducteurs ou câbles