632 results about "Secondary loop" patented technology

The invention discloses a DC voltage divider parameter anomaly detection method based on harmonic characteristics, and the method comprises the steps: deploying an isolation type voltage sensor at a bus of a DC power transmission system, carrying out the voltage sampling through combining with an ADC, carrying out the data buffering and preprocessing, extracting a fundamental wave component and a target harmonic component through the fast Fourier transform, and calculating the harmonic distortion rate. And constructing a low-voltage arm capacitance and harmonic distortion rate model based on a voltage divider secondary circuit equivalent circuit and an energy distribution principle, and calibrating the low-voltage arm capacitance and harmonic distortion rate model. And designing a multi-objective optimization scheduling algorithm based on energy storage capacity and capacitance characteristics, and realizing dynamic power distribution and harmonic suppression of the system. And after abnormal triggering, the system automatically loads a capacitance compensation coefficient, adaptively adjusts algorithm parameters in combination with a measurement loop PI control link, reduces a harmonic amplification effect, and ensures that a measurement error is within an acceptable range. Harmonic monitoring precision and capacitance compensation optimization capability of the direct-current power transmission system are effectively improved, and stable operation of the system is guaranteed.

The invention relates to an electrical equipment fault monitoring and positioning method and system based on data analysis, and belongs to the technical field of electrical equipment monitoring. The method comprises the following steps: sensing a transient traveling wave signal of a fault current by adopting a traveling wave detection technology to determine an initial fault area; acquiring state data of the secondary equipment in the fault area through mapping of the secondary equipment in the fault area; constructing a secondary loop connection model based on the configuration file, and designing an action sequence rule base to verify the action logic and time sequence matching of a regional data centralized protection device, a circuit breaker and a communication link in real time; based on logic verification, action triggering conditions are extracted to be fused with the regional data set; and inputting the fault feature vector into a classification model for fault identification by obtaining the classification model. According to the invention, through traveling wave detection, EEMD decomposition, data synchronization and logic verification, feature information related to the fault is accurately extracted, and through data fusion and real-time learning, the fault identification precision and efficiency are improved.

The invention discloses an anti-direct-current component nanocrystalline current transformer and a using method thereof. The anti-direct-current component nanocrystalline current transformer comprises a current transformer body, and a magnetic core hole penetrating front and back is formed in the middle of the front side of the current transformer body. The device is provided with a secondary side open circuit detection and protection mechanism, so that imbalance of a magnetic field in the mutual inductor caused by disconnection of a secondary loop is effectively prevented, iron core magnetic flux saturation and potential high electromotive force generation are avoided, the safety of the mutual inductor and peripheral equipment is protected, the risk of power system faults such as fire disasters or short circuits is reduced, and meanwhile, the safety of the mutual inductor is improved. A live wire centering fixing mechanism is arranged, so that the stable centering position of a wire in a magnetic core hole of the mutual inductor is ensured, magnetic field distribution is optimized, the magnetic leakage phenomenon is reduced, the accuracy and stability of current measurement are remarkably improved, meanwhile, measurement fluctuation caused by wire shaking is reduced, and the measurement precision is improved. And more accurate data support is provided for harmonic analysis, fault detection and electric energy quality monitoring of a power system.

The invention provides an electric energy metering error correction method and system based on data fusion. Belongs to the technical field of electric energy metering. The method comprises the following steps: collecting multi-dimensional data, and preprocessing the collected multi-dimensional data; performing feature extraction on the operation data by using a convolutional neural network, and mining spatial features in the data; a recurrent neural network is adopted to extract the time sequence characteristics of the secondary loop and environmental data, and time sequence association between the data is established; through convolution kernels (local, middle and global) of different sizes and a depth separable convolution technology, the calculation complexity is reduced, spatial feature multi-level extraction of equipment operation data and environment data is realized, and the comprehensiveness and efficiency of feature expression are improved.

The invention provides a transformer substation secondary circuit intelligent identification method based on multi-scale large-kernel attention YOLOV8, aiming at the requirements of the transformer substation secondary circuit intelligent identification field on identification accuracy and model lightweight in a small sample environment, and the transformer substation secondary circuit intelligent identification method comprises the following steps: carrying out data enhancement and label labeling on original drawing data; a YOLOV8 based on transfer learning is adopted as a backbone network of a model, pre-training and fine tuning are carried out on a large-scale data set, MAB is introduced, an MLKA module is designed based on a large kernel structure and a multi-scale gating mechanism, the gating mechanism and space attention are combined to propose a GSAU, a training set is input into an MLKA-YOLO network model for training learning, and an MLKA-YOLO network model is constructed. After training is completed, a test set is input to carry out secondary circuit terminal strip identification, based on a Paddle OCR framework, line name identification of the terminal strip is realized by using a cyclic convolutional neural network, and a line information comparison library is constructed by using the identified line content.

The invention relates to the technical field of electrics, and discloses an electrical secondary circuit defect systematic detection method, which comprises the following steps: step 1, exquisite construction of an adaptive function detection device, step 2, deep fusion of a novel sensor and a leading edge detection technology, and step 3, robust construction and efficient cooperative operation of a distributed detection system. The method has the advantages that by means of fusion of a multi-element high-precision sensor and an advanced detection technology, the insulation detection precision reaches the millimeter level, the electrical parameter error is reduced by 80%, milliampere-level current changes can be captured, potential faults can be accurately pulled out, a self-adaptive mechanism covers electrical and environmental factors, and under the conditions that the temperature ranges from-40 DEG C to 70 DEG C, the humidity ranges from 10% to 95% and 0.05-15 times of rated load fluctuation, the insulation detection precision reaches the millimeter level; intelligent parameter adjustment is achieved, the false alarm rate is reduced to be within 2% from 20%, a distributed architecture is combined with intelligent diagnosis, the detection period is shortened to 10 minutes per time, fault positioning is shortened to 30 minutes from 4 hours, and the first-aid repair time efficiency and the power supply reliability are greatly improved.

The invention provides a substation secondary circuit label intelligent management system comprising a virtual and real circuit mapping module used for analyzing an SCD file and information logic diagram data and establishing an association relationship between a virtual circuit and a physical circuit; the intelligent label generation module is used for generating an intelligent label containing a dynamic two-dimensional code based on the physical connection model and the virtual loop model; the label analysis and display module scans the two-dimensional code through a mobile terminal to realize linkage visualization of virtual and real loop information; and the multi-source database module is used for storing a physical equipment hierarchical model, a virtual loop configuration table, an information logic path table and a label coding rule. According to the system, association matching of the secondary loop and the virtual loop is realized by analyzing the SCD file, rapid query and visual display of information are realized by means of the intelligent label, and association matching of the secondary loop and the virtual loop is realized by means of the port number, so that the virtual-real corresponding relation of the secondary loop and the virtual loop is realized. Through intelligent management and application of the labels, the accuracy and efficiency of operation and maintenance work are improved.

The invention discloses a low-voltage power distribution anti-misoperation device which comprises an anti-reverse power transmission module, an anti-misoperation module, a power regulation anti-misoperation auxiliary module, an interaction control screen and a state logic switching module. The invention discloses a low-voltage power distribution anti-misoperation method and device, and the method and device can effectively eliminate the above problems through an anti-reverse power transmission module, an anti-misoperation module and a power adjustment anti-misoperation auxiliary module, have the functions of preventing reverse power transmission and preventing power failure of a user caused by manual operation, and have a locking function when a line does not meet a loop closing condition. On the basis that an original secondary loop is provided with three locks and two keys, three heat reverse connection points are added, the device keeps the original three-lock and two-key protection function of a power supply company, and the intelligent heat reverse loop closing operation function is achieved. Therefore, the five-prevention function under the condition that the electric operation cannot be realized due to the defects of the device or the electrical secondary circuit can be met.

A cooling plate for cooling chip having redundant cooling fluid circulation. A primary fluid cooling loop removes heat directly from the chip. A secondary cooling loop acts as a condenser for two phase cells, thus removing heat from the chip indirectly. The cold plate may be fabricated as two parts: bottom plate and top plate where is the fluid is divided to primary stream to the bottom plate and secondary stream to top cooling plate. Two-phase, self-contained cells may be partly immersed in the primary cooling loop and partly immersed in the secondary loop. Fluid ports circulate cooling fluid by having one orifice coupled to the primary cooling loop and one orifice coupled to the secondary cooling loop.

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 measurement and control system of gas heating equipment, which relates to the technical field of equipment measurement and control, and is characterized in that a flow feed-forward control module is used for determining a target mass flow value through a feed-forward compensation processing mechanism according to at least one parameter measured by a sensor measurement module; the temperature control module is used for determining PID control parameters of a cascade PID control structure comprising a main loop and an auxiliary loop according to the temperature parameters measured by the sensor measurement module and a preset temperature difference grading fuzzy PID control rule; and the power control module is used for determining the target heating power according to the target heating rate and the characteristic parameters of the rear-end purging object, and adjusting the heating power of the heater in combination with an anti-integral saturation mechanism configured by the temperature control module and the power control module. By adopting the system, the heating process can be accurately adjusted and quickly responded, and the temperature control stability and the equipment operation efficiency are improved.

The invention discloses a secondary circuit intelligent modeling method and system based on a visual language model, and belongs to the technical field of power system automation, and the method comprises the steps: recognizing and extracting primitives and symbols in a secondary circuit of a transformer substation, and constructing a primitive library; acquiring corresponding first visual language data in the primitive library through a primitive recognition and classification module; performing further deep learning identification on the first visual language data to obtain second visual language data; and carrying out secondary electric loop modeling through the second visual language data and carrying out visual display. The method breaks through a traditional method based on rule and template matching; unified management of models and effective integration of data are achieved, the problems that information is isolated and data are difficult to share are solved, a foundation is laid for development of a digital asset management system and establishment of an integrated application interface, the automation degree of engineering drawing recognition and modeling is improved, and the requirements of a modern electric power system for efficient and accurate automatic modeling are met.

The invention relates to the technical field of nuclear reactor safety, and particularly discloses a reactor waste heat export, recovery and comprehensive utilization system and method based on a heat pipe, and the system comprises a nuclear energy generation system, a secondary loop energy conversion system, a primary loop waste heat discharge system, a secondary loop waste heat discharge system, and a waste heat recovery and comprehensive utilization system. According to the waste heat recycling system, the heat pipe can be used for heat transfer and storage under the peak regulation operation condition, the nuclear heat use efficiency is remarkably improved, the requirements of various types of energy sources such as electricity and heat are met, and passive export of reactor core waste heat can be achieved through multi-natural-circulation coupling cooperative operation under the condition of a whole-field outage accident. By means of the efficient heat transfer characteristic and the modularization characteristic of the heat pipes, independent operation of the heat pipes can be achieved, the problem of single-point failure of the system can be avoided, meanwhile, separation of a reactor coolant and a cooling medium of a waste heat removal system can be achieved, the inherent safety of a nuclear reactor is remarkably improved, and the requirements of multi-purpose scenes are met; and the purpose of fully utilizing resources is achieved.

Embodiments of the invention provide a high density liquid cooling system including a rack, primary loop piping including a primary inlet, a primary outlet, a primary loop filter, and a primary bypass valve, and secondary loop piping including a secondary inlet, a secondary outlet, a first pump, a first filter downstream of the first pump, and a secondary bypass valve. The system includes a heat exchanger having a first side and a second side. When the primary bypass valve is open, at least a portion of the fluid in the primary loop piping flows through the primary inlet and the primary outlet without traversing the heat exchanger, and when the secondary bypass valve is open, at least a portion of the fluid in the secondary loop piping flows through the secondary inlet and the secondary outlet without traversing the heat exchanger.

The invention discloses a DC charging pile charging control system and control method, and the system comprises a charging control module which receives charging demand data and charging electric energy data, and generates a charging control signal based on a preset electric energy control function; the charging monitoring module collects charging electric energy data of the first electric energy processing module and the second electric energy processing module; the electric energy adjusting module is used for controlling and adjusting the electric energy transmitted by the first electric energy processing module and the second electric energy processing module; the first electric energy processing module is used for converting electric energy input by the input power supply into stable direct-current electric energy; the second electric energy processing module optimizes the stable direct-current electric energy and then transmits the stable direct-current electric energy to the charging pile; and the electric energy isolation module isolates the electric connection between the charging main loop and the charging secondary loop. The control signal is generated according to the actual working state of the charging pile, the system is controlled and adjusted based on the control signal, the electric energy utilization rate of the charging pile is effectively improved, the electric energy loss is reduced, and the charging efficiency is optimized.

The invention provides an unsupervised dimensionality-reduction online monitoring method for the abnormity of a secondary circuit of a voltage transformer, and the method comprises the steps: collecting the time sequence voltage data of the voltage transformer in real time, segmenting the data according to a time window, obtaining a time-domain and frequency-domain high-dimensional data sample set in each time window, giving consideration to the time-domain characteristics of the data and the frequency-domain characteristics under an abnormal condition, and achieving the online monitoring of the abnormity of the secondary circuit of the voltage transformer. According to the method, a time domain similarity matrix and a frequency domain similarity matrix are constructed, feature vectors of the similarity matrixes are extracted and dimensionality reduction is carried out, finally, normal and abnormal moment data are distinguished by using an unsupervised Gaussian mixture model method, normal and abnormal transformer secondary circuits can be accurately distinguished by using KL divergence, and more accurate abnormal secondary circuit positioning is realized. And the normal operation of the power system is further ensured.

The invention discloses a 24-hour uninterrupted electric energy monitoring method for secondary circuit voltage drop, relates to the technical field of electric energy metering, and solves the problems that errors exist in electric energy metering and fault early warning and positioning are not timely. The method comprises the following steps: 1, carrying out on-site investigation on a monitoring position, and determining the position and the number of monitoring points; 2, carrying out 24-hour uninterrupted on-line real-time metering or detection on a detected point by arranging an abnormal mode self-identification module; 3, electric energy data of the electric power system is monitored in real time through a secondary circuit electric energy monitoring module, and the secondary circuit electric energy monitoring module comprises the steps that 4, voltage and current signals output by a monitoring point are collected through an LoRa / NB-IoT module, the monitored data information is transmitted to a monitoring center or a cloud platform in real time at a transmission interval less than or equal to 1 minute; according to the invention, the electric energy monitoring capability is greatly improved.

The invention belongs to the technical field of flow accelerated corrosion testing, and particularly discloses a high-temperature water vapor pipeline flow accelerated corrosion performance testing device and method, and the high-temperature water vapor pipeline flow accelerated corrosion performance testing device comprises a detachable testing section, a steam generator, a spraying system and a steam compressor. The steam compressor is connected with the outlet end of the test section and the steam generator and is used for pressurizing to form high-flow-rate steam flow. The spraying system is connected with the bottom of the steam generator, the nozzle is arranged on the pipeline, and liquid drops are introduced into steam flow to form gas-liquid two-phase flow. A DCPD measuring system is integrated in the test section, comprises a sample clamping assembly, an electrode penetrating assembly and a sensor assembly, and is used for clamping a sheet-shaped sample and measuring the corrosion performance. According to the invention, the actual service conditions of the secondary loop pipeline of the nuclear power plant in a high-temperature, high-pressure and gas-liquid two-phase impact environment can be accurately simulated, and meanwhile, the corrosion thinning rate of the material is monitored in real time by utilizing the DCPD measurement system integrated in the detachable test section, so that the hysteresis quality of a traditional offline measurement method is overcome, and the accuracy of experimental data is improved.

A thermal conditioning system including a heat-transfer circuit, a refrigerant circuit including successively: a compressor, a first bi-fluid exchanger and a second bi-fluid exchanger arranged jointly on the refrigerant circuit and on a main loop of the heat-transfer circuit, a first expansion valve, a third bi-fluid exchanger arranged jointly on the refrigerant circuit and on a secondary loop of the heat-transfer circuit, a first branch of the heat-transfer circuit being configured so that the heat-transfer liquid leaving the first bi-fluid exchanger returns to the first bi-fluid exchanger without passing through the second bi-fluid exchanger, and including a second heat exchanger configured to exchange with a second air flow. A second branch connects the first branch to the main loop, and includes a third heat exchanger configured to exchange with the second air flow.

The invention discloses a cascade control method and system for the alum adding process of a waterworks. The cascade control method comprises the steps that preprocessed operation data of the waterworks are obtained; according to the preprocessed operation data, on the basis of a pre-trained LSTM-Transformer prediction model, an alum adding amount prediction value, an effluent turbidity prediction value and a sedimentation velocity prediction value at the current moment are obtained; segmenting the alumen ustum image based on an SAM algorithm, extracting features by adopting OpenCV, and calculating a settling velocity; based on feed-forward-feedback compound control, the feed-forward control adjusts the alum adding amount in time by monitoring the change of the quality of raw water, a main loop of cascade control predicts the water turbidity through MPC to calculate the optimal set value of the settling velocity, an auxiliary loop calculates the alum adding amount through the settling velocity, the feed-forward control and cascade control are subjected to decentralized summation, and the alum adding amount is calculated according to the optimal set value of the settling velocity. And calculating the final addition amount of the alum. According to the invention, the dosage of alum can be regulated and controlled more accurately.

The invention discloses a PLC-based conventional island dosing system and a control method. The PLC-based conventional island dosing system comprises an upper computer, sampling equipment and dosing equipment, wherein the sampling equipment and the dosing equipment are connected with a PLC; a rotating device in the dosing device is connected with the PLC through a DI card key; the ammonia water assembly is connected with a dosing pump module in the rotating equipment; the hydrazine assembly is connected with the dosing pump module, and the dosing pump module is further connected with the secondary loop system; a chemical instrument, an ammonia water assembly and a hydrazine assembly in the sampling equipment and each frequency converter in the dosing pump module are connected with the PLC through AI card keys; the PLC is also connected with the rotating equipment through a DO card key; the PLC is further connected with each frequency converter in the dosing pump module through an AO card key, the PLC monitors the water quality of a secondary loop system based on a chemical instrument in the sampling equipment so as to control the dosing frequency of any dosing pump in the dosing pump module, and then the full-automatic dosing function is achieved.

The present invention discloses a nanocrystalline current transformer with DC component resistance and a method for using the same, comprising: a current transformer having a magnetic core hole extending from front to back in the middle of the front side of the current transformer. The device is provided with a secondary-side disconnection detection and protection mechanism, which effectively prevents the internal magnetic field imbalance of the transformer caused by the disconnection of the secondary circuit, avoids the core magnetic flux saturation and the generation of potential high electromotive force, thereby protecting the transformer itself and peripheral equipment, and reducing the risk of power system failures such as fire or short circuit. At the same time, a live conductor centering fixing mechanism is provided to ensure the stable centering position of the conductor in the transformer core hole, optimize the magnetic field distribution, reduce magnetic leakage, significantly improve the accuracy and stability of current measurement, and reduce measurement fluctuations introduced by conductor shaking, providing more accurate data support for harmonic analysis, fault detection, and power quality monitoring of the power system.

The embodiment of the invention discloses a clock source and electronic equipment, and belongs to the technical field of integrated circuits. The clock source comprises a plurality of inverter chain loops, the plurality of inverter chain loops comprise a main loop and at least two auxiliary loops, and the main loop is respectively coupled with the at least two auxiliary loops to construct at least two coupling relations. According to the embodiment of the invention, the problem of oscillation mode ambiguity of a clock source design scheme capable of improving the oscillation frequency in the related technology is at least solved.

The invention discloses a zero-sequence current acquisition and analysis device and method for a power secondary circuit, and belongs to the field of power systems. The device comprises a current transformer, a temperature sensor, a front-end analog filter, an ADC, a rear-end digital filter, a self-adaptive wave trap, a processor and an alarm. Wherein the output end of the current transformer is connected to the processor through the front-end analog filter, the ADC and the rear-end digital filter in sequence; and the processor is also respectively connected with the temperature sensor and the alarm. According to the invention, real-time acquisition and early warning of the zero-sequence current are realized, and high precision and stability of an acquisition result in a full temperature range are ensured at the same time.

The invention relates to a secondary circuit on-off simulation test device, and belongs to the technical field of secondary circuit detection. The device comprises a signal generation module, a signal acquisition module, a signal processing module, a test analysis module, an intelligent diagnosis module, a control module, a display module, a data storage module, a power supply module and the like. According to the invention, the accuracy, the safety and the high efficiency of the current secondary circuit on-off simulation test work can be solved, and the on-off state of the secondary circuit can be rapidly detected. Various states of the secondary circuit in actual operation are simulated, potential problems are found in advance, and the reliability of a power system is improved. The workload of manual testing is reduced, and the testing efficiency and accuracy are improved.

The invention relates to a secondary loop heat management control method and a vehicle. The secondary loop heat management control method and the vehicle are used for meeting different water inlet temperature requirements on the two sides as much as possible when a passenger compartment and a battery both have cooling requirements. The method comprises the steps that when it is recognized that a passenger compartment and a battery have refrigeration requirements at the same time, the target air outlet temperature of a cold air core, the battery cooling request temperature, the actual air outlet temperature of the cold air core and the actual temperature of a battery inlet are obtained; determining a compressor target rotating speed; according to the first temperature difference between the target air outlet temperature of the cold air core and the actual air outlet temperature of the cold air core, the opening change value of a first three-way valve is determined; determining an opening upper limit value of a first three-way valve and a target rotating speed of a first water pump according to a second temperature difference between the battery refrigeration request temperature and the actual water inlet temperature; the rotating speed of the compressor is controlled according to the target rotating speed of the compressor, the rotating speed of the first water pump is controlled according to the target rotating speed, the opening degree of the first three-way valve is adjusted according to the opening degree change value, and the adjusted opening degree is smaller than or equal to the opening degree upper limit value.

The invention relates to the technical field of current transformer protection, and discloses a current transformer state monitoring method and system, and the method comprises the steps: collecting an instantaneous voltage signal at an output end of a current transformer, calculating an instantaneous current, and extracting an effective value and a phase angle of the output current through fast Fourier transform; and judging whether the difference value between the input current and the output current exceeds the limit or not through the dynamic threshold value, and uploading state data to a background for monitoring. Compared with the prior art that the state of a secondary circuit of a current transformer cannot be accurately detected in real time in a complex environment, and particularly, high-reliability fault identification and protection cannot be realized under the conditions of large current fluctuation, strong environment interference and the like, the method has the advantages that the dynamic threshold and the dominant frequency component phase are extracted, so that the detection accuracy is improved; rapid fault judgment of the state of the current transformer is realized, so that the problem that the transformer is damaged or the system is unstable due to the fault of a secondary circuit is avoided, and the operation reliability and the operation and maintenance efficiency of a power system are improved.

The invention discloses a transformer substation primary and secondary loop vector state comprehensive detection method and system, and relates to the technical field of transformer substation automation, and the method comprises the following components: S1, a vector state comprehensive detection method, S2, intelligent data fusion and analysis, S3, automatic verification and self-diagnosis, and S4, operation process simplification and modular design. According to the method, the current, voltage and frequency electrical signals in the loop are collected in real time and converted into the vector form for comprehensive analysis, the amplitude of the signals is considered, the phase parameters of the signals are deeply analyzed, and therefore whether the phase, polarity and wiring of the loop are correct or not can be more accurately judged, and in addition, the accuracy of the loop is improved. The system further integrates multi-source data such as data, historical data and standard model data collected by a sensor in real time, real-time fusion and analysis are conducted through an intelligent algorithm, and the accuracy and timeliness of a detection result are further improved through comparison and correlation analysis of the multiple data sources.

The invention discloses a method for determining the feed water flow of an evaporator of a nuclear power station and a related device, and relates to the technical field of thermoelectric conversion, and the method comprises the steps: obtaining the steam flow of an outlet of the evaporator, the secondary loop pressure of the evaporator, and the feed water temperature and nuclear power of an inlet of a main water supply pipe; the specific enthalpy coefficient is determined by looking up a table according to the secondary loop pressure of the evaporator and the feed water temperature, and the specific enthalpy coefficient is the ratio of the steam specific enthalpy to the feed water specific enthalpy; the nuclear power is converted into theoretical steam flow, the theoretical steam flow is used for verifying the steam flow of an evaporator outlet, and if verification passes, the steam flow of the evaporator outlet is used as one of the inputs of the feed water flow soft measurement model; and inputting the specific enthalpy coefficient, the steam flow at the outlet of the evaporator and the secondary loop pressure of the evaporator into a water flow soft measurement model to obtain the theoretical feed water flow. According to the method, high-precision dynamic measurement and calculation of the water supply flow of the evaporator are realized based on the water supply flow soft measurement model.

The invention provides a multifunctional electric energy metering simulation device and a design method thereof, and relates to the technical field of electric power metering management, the device comprises a cabinet body, and a special transformer metering module, a load control module and a secondary loop module which are arranged on the cabinet body; the special transformer metering module comprises a three-phase intelligent electric energy meter, a special transformer acquisition terminal, a one-way switch, a combined test junction box and a terminal strip; the load control module is connected with the special transformer metering module, and the load control module comprises a terminal strip, an indicating lamp, a shunt trip switch and a voltage division button; the secondary circuit module is connected with the load control module, and the secondary circuit module comprises a voltage transformer, a current transformer, a primary wire and a secondary wire. According to the invention, through simple wiring, a real on-site metering mode of a special transformer customer can be realized, all-around training of personnel on-site skills and simulation and reproduction of various on-site faults can be realized, and the investigation and treatment capability of personnel on-site faults is improved.