205 results about "Secondary loop" patented technology

The present disclosure belongs to the technical field of health status assessment of secondary circuits in power systems, and specifically relates to an image recognition method for a secondary circuit terminal based on contrastive learning and an improved CRNN. The method includes: step 1: pre-training sample data of a secondary circuit terminal block of a power system through the contrastive learning; step 2: improving a feature extraction layer of a CRNN by using a residual neural network; and step 3: introducing an ECA-Net on the basis of the step 2 to construct a recognition model for the secondary circuit terminal based on the contrastive learning and the improved CRNN. In the method of the present disclosure, an image of the secondary circuit terminal block can be accurately recognized, and the accuracy of image recognition, detection accuracy and detection efficiency can be greatly improved.

The invention discloses a switch cabinet partial discharge and temperature anomaly real-time monitoring method and system, and the method comprises the steps: S1, cooperating with a plurality of power enterprise nodes through a federated learning server, carrying out the combined training of a double-branch fault recognition model under the condition of protecting data privacy, and generating an initial strategy mapping library of related fault information and linkage strategies; s2, deploying the model in an edge computing device, performing cross-model fault identification on real-time monitoring data, and matching a corresponding linkage instruction from a strategy mapping library when the confidence coefficient meets a condition; s3, issuing the linkage instruction to the secondary loop equipment for execution, and collecting execution effect data as linkage feedback data; and S4, the linkage feedback data is processed and transmitted back for triggering iterative training of the fault identification model and strategy parameter updating of the strategy mapping library. According to the invention, closed-loop intelligent monitoring from fault identification and accurate linkage to strategy self-optimization is realized.

The invention provides a grain multi-group decoupling prediction method, a modeling method, equipment and a storage medium. The modeling method comprises the following steps: providing a training database; extracting a feature library; training a secondary loop model, and outputting a first component prediction result; training a main loop model; and iteratively training the secondary loop model and the main loop model to obtain a grain multi-group decoupling prediction model. The method not only corrects a spectral reflection value, but also constructs a closed-loop prediction mechanism based on a first component state, dynamically screens wavebands, establishes an internal and external double-closed-loop cascade architecture of a main loop and an auxiliary loop, continuously adjusts parameters and updates a feature library, thereby realizing systematic suppression of interference signals and enhancement of intrinsic features of a second component. An interpretable feature screening mechanism is introduced, the importance of each wave band is evaluated in real time, the combination of a data-driven model and spectral physical prior is realized, and the problem that the generalization performance is reduced due to the fact that the model depends on shortcut features in the training process is avoided.

The invention discloses a transformer substation secondary circuit drawing intelligent processing method and system, belongs to the technical field of electric power system digitization, and aims to solve the problems that the missing detection and false detection rate of old fuzzy drawings is high, a deep learning model lacks topological semantic understanding, full-process automation is insufficient, and structural management is lacked in conventional secondary circuit drawing processing. According to the core scheme, the method comprises the steps of segmenting an image through a U-Net network to generate masks, generating a structured topology table in combination with a primitive database, converting the structured topology table into nodes and directed edges with electrical attributes, constructing a queriable graph database integrating version management, rule check and a layout optimization algorithm, and finally generating a standard format drawing. According to the scheme, the primitive recognition and topology analysis precision is improved, deep mapping from images to electrical logic is achieved, full-process automation is achieved, version tracing and rule verification are supported, and standardized drawings are produced.

The invention discloses a complete-cycle health maintenance method, system and device for secondary circuit equipment and a medium, and the method comprises the steps: obtaining the operation data of the secondary circuit equipment, and dividing the operation data into an initial data set and an incremental data set; constructing an initial health prediction model by using the initial data set, and predicting the residual service life of the secondary circuit equipment; according to an incremental learning algorithm, updating the initial health prediction model by using an incremental data set to obtain an updated health prediction model; and performing health state evaluation and residual service life prediction on the secondary circuit equipment by using the updated health prediction model, thereby realizing complete-cycle health maintenance of the secondary circuit equipment, automatically adjusting an incremental learning strategy according to the change of an equipment operation environment, and improving the adaptability of the system.

The invention relates to the technical field of data center heat management, and particularly discloses a double-loop heat recovery immersed data center cooling system, which comprises an immersion cooling cabin, a heat recovery module, a heat recovery module, a heat recovery module and a heat recovery module, wherein the immersion cooling cabin is used for installing a server circuit board in an immersion manner; the cooling liquid circulating system is used for removing core heat of the server; a main circulating loop is formed by a variable-frequency circulating pump, a precision filter, a cooling liquid conveying valve, a spraying device, an immersion cooling cabin, a cooling liquid return valve and a refrigerating unit which are connected in sequence; the waste heat recovery cooling system is independent of the main loop and is connected to the heat storage tank through a heat exchange pipe immersed in cooling liquid, a waste heat adjusting valve and a water pump to form a secondary loop for extracting medium and low temperature waste heat; and the intelligent regulation and control module is used for collecting data and outputting a control instruction. According to the system, through immersed direct heat exchange and independent double-loop design, cooperation of server core heat dissipation and waste heat recovery is achieved, and the heat dissipation efficiency and the energy comprehensive utilization level are improved.

According to the integrated thermal management method for the secondary circuit of the new energy automobile, mechanical abrasion or electrical faults are accurately recognized by monitoring the rotating speed and the current signal of the main water pump in real time, and the standby water pump is rapidly switched to guarantee circulation continuity of cooling liquid; meanwhile, the opening degree of the electric control valve is dynamically adjusted to optimize flow distribution of each branch, and the temperature of the battery is maintained in a safe interval in combination with multi-point temperature data fusion processing; in addition, by means of branch isolation and bypass channel switching, local faults can be handled in time, and the overall cooling capacity is maintained. According to the invention, the stability and safety of the thermal management system in multiple scenes are obviously improved.

The utility model provides a kind of bus duct initial end box, including main circuit component, secondary circuit component and flange unit;Main circuit component includes initial end box shell, secondary circuit component includes secondary circuit shell and secondary circuit component, secondary circuit component is independently set on initial end box shell by secondary circuit shell, hoisting structure is also provided on initial end box shell.The utility model provides a kind of bus duct initial end box by independently setting secondary circuit component on the initial end box shell of main circuit component, can make main circuit component and secondary circuit component be arranged in different box, and by setting secondary circuit component in secondary circuit shell, the effect that secondary circuit component and main circuit component and flange unit are completely isolated can be realized, realize full physical isolation;And support maintenance secondary circuit under the condition that main circuit is not power off, satisfy the rigorous power demand of data center.

This invention discloses a substation secondary circuit design method based on equipment functional areas and template matching. The method includes assigning descriptions to secondary equipment based on voltage level or bay; constructing secondary circuit data templates; matching the data template library based on the connection relationships of local equipment functional areas within a bay; extracting functional area connection information through a typical template information flow table; and converting the functional area connection information into actual equipment terminal connections to complete the substation secondary circuit design. This invention mutually converts the functional areas of secondary equipment with the design of secondary circuits, constructing data templates for substation secondary circuits. By improving the VF2 graphical matching algorithm, it achieves digital storage of data templates and rapid matching of complete bay information using local information from data templates. After matching, the functional area connections of the data templates are reverse-converted into equipment terminal connections, realizing automatic secondary circuit design and improving the digital design level of secondary systems.

The invention relates to the technical field of data processing, in particular to a secondary circuit defect intelligent detection method based on infrared temperature measurement, which comprises the following steps of: acquiring a temperature data sequence of a secondary circuit, acquiring an initial detrending component in any internal loop iteration of STL decomposition on the temperature data sequence, and calculating the initial detrending component according to the initial detrending component; carrying out fast Fourier transform to obtain a frequency domain signal, and judging whether the initial detrending component has a clear periodic characteristic or not according to the energy distribution characteristic of the frequency domain signal; if the initial detrending component does not have a clear periodic characteristic, performing seasonal correction processing on the initial detrending component to obtain a corrected seasonal component, marking the initial detrending component as an uncorrected seasonal component, and obtaining a target residual component of any internal loop iteration according to the corrected seasonal component and the uncorrected seasonal component; and repeating the target residual component acquisition method to obtain the final residual component, thereby improving the accuracy of defect detection on the secondary loop.

The application discloses a kind of data acquisition and association method and system of substation secondary circuit, belong to substation technical field, by establishing structure topological graph and generating data label for node, using event-driven mechanism to capture the data slice of state change moment.Based on the establishment of verification task based on theoretical connection relationship, the multi-dimensional response characteristics of the node are extracted, a multi-dimensional physical constraint model integrating time dimension, electrical logic dimension and signal quality dimension is constructed, and the confidence of node connection is quantified by calculating comprehensive verification indicators.When the connection is found to be untrustworthy, the system automatically scans all network nodes to establish a temporary verification task, locates and corrects the real connection nodes, and completes the topology update.The technical problems of static label unable to track physical connection changes, passive diagnosis unable to actively prevent, and unable to automatically repair after problem discovery are solved.

The invention relates to the technical field of power system automation, in particular to a circuit breaker operating mechanism secondary circuit system suitable for a 110kV intelligent substation and a control method, the system adopts a layered architecture of a primary equipment layer, a secondary equipment layer, a station control layer and a dual-network redundant communication network, and is configured with equipment such as a high-precision sensor and a dual protection device; and equipment compatibility and data intercommunication are realized by following the IEC61850 standard. The control method comprises the five steps of state information collection, intelligent diagnosis, misoperation prevention locking, programmed operation and remote maintenance, and the operation success rate is guaranteed to be 99.99% through a dual mechanism of electrical hard contact and networked soft locking and a two-stage diagnosis mode of edge calculation and station level fusion analysis in cooperation with triple verification of programmed operation. The system solves the problems of isolated island, high misoperation risk and the like of traditional loop information, realizes full-dimensional state monitoring and predictive maintenance, adapts to the automatic and intelligent requirements of an intelligent power grid, and improves the safety and reliability of a transformer substation.

This invention belongs to the field of nuclear power unit control technology, and discloses a method and apparatus for peak shaving in a cogeneration nuclear power unit based on secondary loop adjustment. The method includes: collecting the heat balance diagram of the cogeneration nuclear power unit; establishing mass and energy balance equations for each stage of the heaters in the secondary loop of the nuclear power unit, wherein a heat storage tank is installed in the secondary loop; converting the mass and energy balance equations into steam-water distribution equations; obtaining the extraction steam amount for each stage of regeneration in the secondary loop of the nuclear power unit based on the steam-water distribution equations; calculating the minimum and maximum turbine power through the work equations of the secondary loop of the nuclear power unit; defining the electrical load adjustment range of the nuclear power unit as less than or equal to the maximum turbine power and greater than or equal to the minimum turbine power; and performing peak shaving based on the electrical load adjustment range. This invention avoids the safety hazards of traditional nuclear power peak shaving and helps to improve the flexibility and scope of cogeneration nuclear power unit heat and power load adjustment.

This application relates to the field of relay protection technology, specifically disclosing a method, apparatus, equipment, and storage medium for evaluating secondary circuits. The method includes the following steps: obtaining an estimated fault distance associated with a fault event to be tested; determining the expected response range corresponding to the fault event based on the estimated fault distance; extracting the actual action set; performing a consistency check between the action set corresponding to the expected response range and the actual action set to obtain a consistency check conclusion; and outputting the evaluation result corresponding to the fault event based on the consistency check conclusion. By obtaining the estimated fault distance and determining the expected response range, the evaluation object is narrowed from the entire line bay to the responsibility domain corresponding to the fault location, reducing the probability of misjudgment in secondary circuit evaluation. The automated evaluation process, with fault distance as the core constraint and employing consistency check, improves the efficiency and stability of fault evaluation.

The invention belongs to the field of power supply and distribution, and particularly relates to a method for monitoring and identifying a broken line grounding fault in a high-voltage winding of a distribution transformer in a Dyn wiring mode in real time. The method comprises the following steps: S1, monitoring high-voltage side zero-sequence voltage and low-voltage side voltage data of the distribution transformer in real time; s2, obtaining high-voltage side zero-sequence voltage data, and setting the high-voltage side zero-sequence voltage data as a judgment basis 1; s3, synchronously collecting three-phase voltage of a low-voltage side, and designing a judgment basis 2; and S4, in combination with the judgment basis 1 and the judgment basis 2, diagnosing the internal condition of the high-voltage winding in the corresponding transformer, and correspondingly prompting the fault condition. High-voltage side data are collected through a voltage transformer, and low-voltage side data are collected in real time through an existing port meter or a low-voltage fusion terminal. Zero-sequence voltage is calculated through high-voltage-side three-phase voltage data collected by a voltage transformer, or the zero-sequence voltage is directly measured through a secondary circuit opening triangle of the voltage transformer, and generation of the high-voltage-side zero-sequence voltage serves as a starting condition.

The invention discloses a heat energy recycling system in a nuclear power station. The system comprises: a generator; a heat exchanger for transferring heat to water in the secondary circuit to generate steam; the steam generator is used for transferring the steam to the steam turbine; the steam turbine is used for pushing the generator to rotate to generate electric energy; and the condenser is used for cooling the steam, so that the steam returns to the secondary loop. Therefore, the flow speed of secondary loop water can be monitored and adjusted in real time, and the working state of the heat exchanger is improved.

A refrigeration system (10) for a motor vehicle (200) is described, wherein the refrigeration system (10) has a refrigerant circuit (11) with: a refrigerant compressor (12); a first heat exchanger (22); a second heat exchanger (18); a third heat exchanger (26); wherein the second heat exchanger (18) has a larger internal volume than the third heat exchanger (26);wherein the first heat exchanger (22) is arranged downstream of the second heat exchanger (18) and the third heat exchanger (26) such that a primary circuit (14) is formed with the second heat exchanger (18) and the first heat exchanger (22), and that a secondary circuit (16) is formed with the third heat exchanger (26) and the first heat exchanger (22), wherein at least one valve assembly (V1, A3, A4) is arranged downstream of the refrigerant compressor (12) which is configured to direct a refrigerant flow from the refrigerant compressor (12) to the primary circuit (14) and / or to the secondary circuit (16). It is provided that at least one compensating volume device (30) is arranged downstream of the valve assembly (V1, A3, A4) in the secondary circuit (16) upstream of the third heat exchanger (26) and / or downstream of the third heat exchanger (26).

The invention discloses a circulating water winter energy-saving and constant-temperature automatic control unit which comprises a temperature controller, a fan automatic control primary loop, a fan automatic control secondary loop and a temperature sensing probe, and the temperature sensing probe is electrically connected to the temperature controller. The fan manual start-stop primary loop comprises a first manual operation loop air switch, a first contactor, a first thermal protection relay and a cooling tower fan motor which are sequentially connected. The fan manual start-stop secondary loop comprises a U21 which is sequentially connected with an FR, a second stop button switch, a first start button switch and a self-protection loop contactor normally open contact KM1. According to the invention, low temperature and cold wind in winter, return water heat and control of the temperature controller are ingeniously utilized, so that the temperature of circulating water is in a set dynamic balance, energy consumption is reduced, the hydraulic oil temperature of the injection molding machine is improved, the viscosity of the hydraulic oil is reduced, the fluidity of the hydraulic oil is improved, and equipment is in a more excellent operation state.

The present disclosure belongs to the technical field of health status assessment of secondary circuits in power systems, and specifically relates to an image recognition method for a secondary circuit terminal based on contrastive learning and an improved CRNN. The method includes: step 1: pre-training sample data of a secondary circuit terminal block of a power system through the contrastive learning; step 2: improving a feature extraction layer of a CRNN by using a residual neural network; and step 3: introducing an ECA-Net on the basis of the step 2 to construct a recognition model for the secondary circuit terminal based on the contrastive learning and the improved CRNN. In the method of the present disclosure, an image of the secondary circuit terminal block can be accurately recognized, and the accuracy of image recognition, detection accuracy and detection efficiency can be greatly improved.

The invention relates to the field of non-power-outage transformation, in particular to a transition protection system for non-power-outage transformation and a transformation method. The analog circuit breaker is connected to the terminal strip sleeve group through the connecting cable, and is matched with the transition period protection device and the pre-installation protection device for debugging, so that debugging signal access and quit are realized; the terminal strip set comprises a transition type protection terminal strip and a debugging terminal strip, the transition type protection terminal strip is connected to the transition period protection device, and the debugging terminal strip is connected to the pre-installation protection device; and the transition type protection terminal strip is connected with an on-site secondary loop and a corresponding screen cabinet through a secondary cable group. According to the scheme, seamless protection transition from exiting of an old protection device to inputting of a new protection device is achieved through a rapid non-destructive connection tool. Off-line debugging is carried out through a simulation circuit breaker before transformation, so that the compatibility of a transitional protection device and a pre-installed protection device is ensured; and after the transformation is completed, a new protection device is quickly switched, and the updating and upgrading of the secondary equipment are realized.

This invention relates to the field of data transmission technology, and discloses a ring-based communication method, system, device, and medium for isolating control flow in the secondary circuit of a high-voltage switchgear. The method includes: collecting real-time transient ground potential data from multiple grounding points in a high-voltage switchgear substation; recording initial communication parameters and dividing the communication ring network topology for the secondary circuit system within the substation; synchronously performing ground potential common-mode interference analysis and ring network communication quality assessment of the secondary circuit system according to a preset interference detection cycle, and outputting the interference analysis results and communication quality assessment results in real time; comprehensively judging the communication reliability of the secondary circuit system based on the interference analysis results and communication quality assessment results, and executing corresponding communication route reconstruction and isolation protection strategies according to the judgment results. This invention solves the problem of delayed or misjudged response to concealed common-mode interference in existing technologies, providing comprehensive protection for the safe and stable operation of the secondary circuit of a high-voltage switchgear under extreme conditions.

This invention discloses a method and system for early warning of grounding wire breakage in armored shielded DC cables. The method includes: measuring the grounding current of the shielding layer and the grounding current of the armoring layer at both ends of the armored shielded DC cable; calculating the waveform similarity between the grounding current of the armoring layer and the grounding current of the shielding layer at each end; comprehensively judging whether a grounding wire breakage has occurred at each end based on the current amplitude, waveform similarity, cable operating status, and grounding grid health status; and issuing a corresponding breakage warning signal when a grounding wire breakage occurs. This invention can effectively improve the operation and maintenance level of substation secondary circuits.

The embodiment of the application provides a power plant electrical secondary circuit relay protection safety linkage control method and system, and relates to the technical field of power plant electrical protection. The method first acquires a real-time data set, and obtains an effective data set by performing hierarchical preprocessing on the real-time data set. Then, a relay protection safety linkage judgment model is used to output a state judgment result based on the effective data set. Then, a linkage control strategy is executed according to the state judgment result. Then, a linkage control log is generated by monitoring the execution process of the linkage control strategy, and the relay protection linkage judgment model and the linkage control strategy are dynamically optimized based on the linkage control log. The method adopts a multi-source data acquisition system, cooperates with a double judgment logic of a main criterion and a backup criterion, and improves the accuracy of state identification. The method can also dynamically correct the judgment threshold of the model and the linkage control strategy based on the linkage control log, thereby improving the reliability of the relay protection control.

The invention discloses a control method and device for a nuclear reactor, and the method comprises the steps: obtaining a first outlet working medium state of a once-through steam generator under the condition that the shutdown time of the nuclear reactor reaches a preset time; under the condition that the first outlet working medium state indicates that the outlet of the once-through steam generator is in a non-supercooled water state, the operation mode of the secondary loop is switched into a low-load water supply mode, and first control operation is executed on the secondary loop; after the first control operation is completed, first state information of a loop is obtained; and under the condition that the first state information of the primary loop reaches the long-term primary loop waste heat removal operation condition, the secondary loop is controlled to be switched to a long-term primary loop waste heat removal mode. According to the embodiment of the invention, the once-through steam generator can be prevented from being damaged.

This invention provides a heat dissipation system with a tertiary loop heat pipe, comprising a cooling tower, a heat exchange unit, an immersion cooling chamber, and a heat source. The cooling tower and the heat exchange unit are thermally connected via a primary loop, the heat exchange unit and the immersion cooling chamber are thermally connected via a secondary loop, and the immersion cooling chamber and the heat source are thermally connected via a tertiary loop. The tertiary loop is a loop heat pipe, wherein the evaporator end of the loop heat pipe is thermally connected to the heat source to absorb heat, and the condenser end of the loop heat pipe is located within the immersion cooling chamber. This invention's heat dissipation system adds a tertiary gas-liquid circulation pipeline, allowing the heat exchange unit inside the immersion cooling chamber to be immersed within the chamber, enhancing heat transfer and improving overall heat dissipation efficiency.

The application provides a power system secondary circuit fault diagnosis method and system, and belongs to the technical field of power equipment state monitoring and intelligent diagnosis. The method comprises the following steps: acquiring first characteristic data of a target monitoring point in a secondary circuit of a power distribution device and storing historical characteristic data; performing outlier analysis based on the first characteristic data of the target monitoring point; comparing the first characteristic data of the target monitoring point with a reference set, first performing global anomaly detection by using a robust Z-score method, and then performing local anomaly detection on the first monitoring point by using a local outlier factor algorithm; and based on the historical characteristic data of a second monitoring point, performing trend analysis by using a state space model method to identify an abnormal change trend, so as to realize fault diagnosis of the secondary circuit. The application can quickly identify significant global individual anomalies, effectively detect early weak anomalies, can identify a slow development of a persistent degradation trend, and improves the accuracy and reliability of the secondary circuit fault diagnosis.

According to a first aspect of the application, a header (1100) for a heat exchanger assembly (1000) of a nuclear reactor (1) is proposed. The header comprises a shell (1110) at least partially defining a central cavity (1300) for receiving at least one heat exchanger unit (1200) and comprising at least one port (1116, 1118) in communication with the central cavity (1300). A working fluid flow passage (1400) is at least partially formed within the shell (1110). The working fluid flow passage comprises a collection passage segment (1403) extending along the shell (1110) and at least one inlet passage segment (1401) connecting the respective at least one port (1116, 1118) to the collection passage segment (1403). The header further comprises a passage for connecting the collection passage segment (1403) to a secondary circuit.

The application discloses a kind of detection device and method of electric energy metering secondary circuit.The detection device of electric energy metering secondary circuit includes measurement module and control module;Measurement module is used to select A phase voltage output end, B phase voltage output end, C phase voltage output end, A phase current output end, C phase current output end, A phase voltage input end, B phase voltage input end, C phase voltage input end, A phase current input end, C phase current input end and ground terminal at least two are connected, to measure the resistance between any two phase voltage loops of voltage transformer secondary circuit, the resistance between any two phase voltage loops of electric energy meter, B phase ground resistance, A phase current loop resistance of current transformer secondary circuit, C phase current loop resistance and the resistance between voltage loop and current loop of electric energy meter;Control module is used to detect whether the wiring of electric energy metering secondary circuit is correct based on the resistance measured by measurement module.

The invention provides an automatic reconstruction method and system for a connection relation in a secondary circuit digital model, and the method comprises the steps: extracting semi-connection cable information containing a descriptive text of an opposite-side screen cabinet from the secondary circuit digital model, and carrying out the semantic analysis of the semi-connection cable information, so as to extract the screen cabinet feature information corresponding to each screen cabinet; performing one-to-one matching on the source screen cabinet and all the target screen cabinets according to the screen cabinet feature information, and establishing a screen cabinet level connection relationship for the source screen cabinet and the target screen cabinet which are successfully matched; pairing the semi-connection cables between the source screen cabinet and the target screen cabinet forming the screen cabinet-level connection relation according to a preset multi-level cable matching rule; and performing attribute complementation on the successfully paired semi-connection cables to form a complete cable connection record, and persisting the complete cable connection record to the secondary loop digital model. According to the method, high automation, high accuracy and high robustness of connection relation reconstruction can be realized.