73 results about "Load loss" patented technology

The invention provides a hysteresis loop analysis method for a transformer no-load loss test, and belongs to the technical field of transformers. Exciting voltage and current signals are collected in a transformer no-load state, and an active filter is used for carrying out digital filtering processing to eliminate harmonic interference; a data corresponding relation between magnetic flux density and magnetic field intensity is established through a digital integration algorithm and a magnetic field intensity calculation formula to form original hysteresis data, the original hysteresis data is processed by using a hysteresis loop optimization model, a complete hysteresis loop curve is generated, and the hysteresis loop area is calculated. According to the hysteresis loop area, the hysteresis loss power density is calculated through the iron loss calculation function, the total value of the transformer no-load loss is obtained by combining the eddy current loss calculation result, and the technical problems that the hysteresis loop reconstruction precision is not high and the complex hysteresis phenomenon cannot be adapted in the transformer no-load loss test are solved.

The application discloses a variable-load super-large capacity dry-type transformer, relates to the related technical field of dry-type transformers, and comprises three groups of main iron core columns and three groups of auxiliary iron core columns, wherein the main iron core column section is provided in a stepped shape, the inside of the main iron core column is stacked by three layers of amorphous alloy strips, the thickness of the middle layer of the three layers of amorphous alloy strips is 1.2-1.5 times that of the two side layers, and the lamination groups in the inside of the auxiliary iron core column are provided with independent lap pieces at the joints. The application realizes uniform magnetic flux density distribution and single-column capacity improvement by combining the stepped section of the three groups of main iron core columns with the magnetic yoke which is thin at the top and thick at the bottom, solves the problems that the single capacity of the traditional dry-type transformer is limited and the whole machine needs to be replaced for capacity expansion, reduces the occupied volume through modular splicing, increases the capacity of a single group of iron core columns, and reduces the no-load loss.

The application belongs to the technical field of power distribution network automation, and particularly relates to a power distribution transformer intelligent regulation and control method and system based on energy efficiency evaluation, which comprises the following steps: collecting the low-voltage side current, rated current, no-load loss and load loss of a power distribution transformer, and calculating the load rate; obtaining the fluctuation intensity according to the standard deviation of the load rate in a sliding window, and obtaining the change gradient by subtracting the load rates at adjacent time points; obtaining the direction consistency index according to the consistent degree of the directions of the change gradient in a preset number of steps; calculating the noise covariance according to the fluctuation intensity and the direction consistency index, and obtaining the smoothed load rate by substituting the Kalman filter equation; dynamically determining the threshold step number according to the direction consistency index, calculating the smoothed total loss, and determining the preset energy efficiency threshold according to the no-load loss and the load loss. The application reduces the tap changer regulation frequency and prolongs the service life of the contact.

The invention discloses a transformer design method and system based on a hierarchical genetic algorithm and a medium, and belongs to the field of transformer design. The method comprises the steps that a structural hierarchical model of an amorphous alloy three-dimensional roll iron core transformer is constructed based on transformer parameters; inputting the structure layering model into a preset multi-physics field coupling simulation model, calculating iron core no-load loss power and winding load loss power, and determining a simulation temperature field in combination with the amorphous alloy iron core thermal conductivity and a dynamically calibrated boundary convective heat transfer coefficient; according to the sequence of the three-dimensional roll iron core layer, the winding layer and the oil duct layer, hierarchical genetic algorithm optimization is executed to obtain an optimization scheme, iterative simulation is conducted on the optimization scheme until an obtained simulation result meets a first preset condition, and the amorphous alloy three-dimensional roll iron core transformer is constructed based on the determined target structure parameters. And the design rationality and the operation safety of the amorphous alloy three-dimensional roll iron core transformer can be improved.

The invention belongs to the field of electric power, and discloses a transformer loss optimization method, device and equipment and a storage medium, and the method comprises the steps: taking the minimization of the total loss value of a transformer as a target to construct an optimization function, and the total loss value comprises the no-load loss and load loss of the transformer; generating at least one constraint condition according to the electrical parameter requirement of the transformer, and generating a target function by taking the generated constraint condition as a penalty function and an optimization function; constructing a loss optimization model of the transformer; the loss optimization model is used for determining a target structure parameter combination, and the structure parameters contained in the target structure parameter combination comprise iron core stack thickness, low-voltage winding layer number, high-voltage winding width, high-voltage winding thickness, low-voltage winding width and low-voltage winding thickness; solving the loss optimization model according to a particle swarm optimization algorithm; each particle in the solving process corresponds to a structure parameter combination, and the structure parameter combination which does not conform to at least one constraint condition enables the penalty function value of the penalty function to shift.

The application relates to the technical field of power supply, and discloses a synchronous rectification control circuit and a synchronous rectification power supply device, which comprise a power conversion module, an output current sampling module and a PWM controller; the power conversion module comprises a freewheeling switch tube and is connected in parallel at two ends of a load; the output current sampling module is connected in series in a secondary winding loop, is used for collecting an output current flowing through the secondary winding loop, and generates an output current signal; the PWM controller is connected with the output current sampling module and is used for driving the freewheeling switch tube; the PWM controller is configured to compare the output current signal with a preset threshold value, generate a first group of PWM control signals when the output current signal is greater than or equal to the preset threshold value, and drive the freewheeling switch tube; and stop driving the freewheeling switch tube when the output current signal is less than the preset threshold value. The application can reduce no-load loss and adapt to the demand of electronic products for high power density and low loss.

This application discloses a primary and secondary equipment fusion compartment transfer system and method, relating to the field of substation renovation. The method includes a fusion compartment, connecting cables, and flexible cables. The fusion compartment includes primary and secondary equipment. One end of the connecting cable is connected to the busbar of the 10kV switchgear to be renovated in the substation. The other end of the connecting cable is connected to the main and secondary cabinets of the primary equipment. One end of the flexible cable is connected to the 10kV feeder cabinet of the primary equipment. The other end of the flexible cable is laid within a set range of the terminal pole of the line to be renovated. The flexible cable is used to reconnect the line to be renovated. The secondary equipment is used to protect the main transformer and switchgear of the substation. This application enables substation renovation without load loss and without power outage.

The application discloses an analysis method and system for energy saving and loss reduction of a transformer, comprising: collecting standby state data of a transformer group, identifying a high-loss unit and predicting a parameter drift trend thereof; acquiring an electromagnetic shock intensity signal in a working state; fusing the parameter drift trend and the electromagnetic shock intensity signal, evaluating a risk of synergistic disorder; and adaptively performing dynamic voltage regulation and load balancing optimization according to a risk evaluation result and a risk cause. Through cross-condition correlation analysis and closed-loop control on the transformer group as a power supply core, the application not only can effectively reduce standby no-load loss and delay equipment aging, reduce operation cost, but also can ensure long-term stability and reliability of a power supply system, and can be widely applied to industrial fields such as pulse electric fields and precision manufacturing.

The application discloses a kind of hydrogen energy storage's electric heating gas hydrogen comprehensive energy system random optimization scheduling method, and comprehensive energy system mainly includes four subsystems of electricity, heat, gas, hydrogen.The dynamic efficiency model of electrolytic cell, fuel cell is analyzed in the application, and the energy conversion equipment, energy storage equipment etc. between multiple energy in system are established corresponding mathematical model.The energy purchase cost, load loss compensation cost, environmental cost and wind and light penalty cost are comprehensively considered, and the total operation cost of electric heating gas hydrogen comprehensive energy system minimization is taken as objective function to carry out scheduling to the generation, heating, gas supply and electrolytic hydrogen production involved in system.The optimization scheduling method proposed in the application can effectively consume wind power, reduce operating cost, reduce environmental pollution, and has good economy and environmental protection.

The utility model provides a transformer iron core, which relates to the technical field of transformers, the transformer iron core is formed by stacking a plurality of iron core sheets, each iron core sheet is provided with a plurality of auxiliary holes in a counterpoint manner, each auxiliary hole is kidney-shaped, and the long edge direction of each auxiliary hole is arranged along the magnetic induction line direction of the iron core sheet. The transformer iron core provided by the utility model can effectively reduce the influence of the auxiliary holes on no-load loss.

The present application relates to a kind of large-capacity energy-saving amorphous alloy transformer, including shell piece, winding assembly and heat dissipation piece, the outside of shell piece is sleeved with heat dissipation piece, the internal cavity of shell piece is provided with winding assembly, the internal cavity of shell piece contains insulating liquid, winding assembly is soaked in insulating liquid. By using 1K101 high permeability amorphous alloy core, the no-load loss is greatly reduced, the leakage magnetic is reduced, and the energy-saving effect is improved. Through the cooperation of rectangular core and coil cross-section structure, the weight of the core is reduced, the material is saved, and the operating noise is reduced.

The application discloses a solar inverter system, and particularly relates to the technical field of solar power generation and power electronic control, which comprises the following modules: a photovoltaic module string dynamic reconstruction module, which dynamically adjusts the parallel connection topology of the module string through a matrix switch network, and isolates mismatched modules to output maximum power point direct current; a multi-modal MPPT and predictive control module, which fuses a neural network to output an optimal duty cycle; a high-frequency isolated DC-AC power conversion module, which adopts an LLC resonance topology and dynamically adjusts resonance inductance and capacitance, and combines temperature self-adaptive frequency and dead zone control to perform efficient conversion; an intelligent grid-connected and energy storage interface module, which supports virtual synchronous generator charging and discharging management, and bypasses the converter to reduce no-load loss when off-grid and light load; and a thermoelectricity cooperative self-adaptive cooling module, which adjusts cooling intensity based on loss feedforward prediction, and recycles waste heat to feed back to a direct current bus. The application improves solar inverter power generation efficiency, power conversion energy efficiency and system energy utilization rate.

A control system includes: a detection module configured to: analyze a harmonic content metric to determine whether a load break condition exists; if a load break condition exists, compare an amplitude metric of electrical current to an undercurrent specification to determine whether a load loss condition exists; determine whether an electrical system includes one or more broken electrical conductors, where to determine whether the electrical system includes one or more broken conductors, the detection module is configured to determine whether the load break condition and the load loss condition exist at the same time; and if the electrical system includes one or more broken electrical conductors, generating a switch command. The control system also includes a command module configured to: control a switch to stop electrical current flow into the one or more broken conductors in response to the switch command.

The present invention relates to an iron core for a transformer having low no-load loss and a manufacturing method thereof. The iron core for a transformer according to an embodiment of the present invention includes a core subpart in which multiple steel sheets are stacked and which includes a through-hole penetrating in a stacking direction, wherein a direction intersecting the stacking direction is defined as a first direction and a direction intersecting the stacking direction and the first direction is defined as a second direction, and a ratio (D / W) of a diameter (D) to a width (W) of the through-hole is 0.02 to 0.20 under the assumption that a shorter length is defined as a width (W) when comparing a length in the first direction and a length in the second direction in the core subpart.

According to the power distribution network risk assessment method under the lightning and rainstorm composite disaster based on the blind number theory, the influence of rainfall intensity on the insulation flashover voltage of the power distribution line is considered to construct the power distribution line fault probability model, and the influence of rainfall intensity on the insulation margin of the fan blade is considered to construct the fan fault probability model; constructing a transformer fault probability model; selecting a typical fault scene of the power distribution network under the lightning and rainstorm composite disaster by adopting an information entropy method; respectively representing the load loss rate, the distribution line heavy load proportion, the transformer heavy load proportion and the node voltage out-of-limit proportion as different blind numbers, calculating the risk measurement of each risk assessment index through the expectation operation of the blind numbers, and then synthesizing the weights of different risk assessment indexes to calculate the fusion value of the power distribution network risk assessment indexes. And determining the risk level of the power distribution network. According to the invention, the accuracy and comprehensiveness of power distribution network risk assessment under lightning and rainstorm composite disasters can be improved.

This invention relates to a tensioning platform and method for transformer core processing, belonging to the field of core processing technology. It includes a platform assembly for assisting in the stacking and splicing of silicon steel sheets. The platform assembly includes a base component, multiple guide components, and multiple tensioning components. The base component supports the silicon steel sheets, the guide components provide guidance during the stacking and splicing process, and the tensioning components apply a uniform and adjustable tension force to the silicon steel sheet stack. The base component includes a base on which the silicon steel sheets are placed. Multiple positioning holes are evenly distributed on the top surface of the base. Through the operation of the platform assembly, a uniform and adjustable tension force is applied to the silicon steel sheet stack, eliminating gaps between the stacked silicon steel sheets and preventing loosening and deformation during subsequent assembly and operation. Simultaneously, it ensures consistent alignment of the stacked silicon steel sheets, improving the overall magnetic permeability of the core and reducing transformer no-load losses.

The invention relates to the technical field of transformer iron core structures, and provides an iron core multistage elastic pressing and fixing transformer which comprises a transformer body and an iron core body installed in the transformer body, and the iron core body is composed of an upper iron yoke, a lower iron yoke and a plurality of core columns between the upper iron yoke and the lower iron yoke. The transformer further comprises upper clamping plates, lower clamping plates, flexible pressing assemblies and an installation structure, the upper clamping plates are installed on the front side and the rear side of the upper iron yoke correspondingly, the lower clamping plates are installed on the front side and the rear side of the lower iron yoke correspondingly, and the multiple flexible pressing assemblies are installed between the two upper clamping plates and between the two lower clamping plates correspondingly. By means of the technical scheme, the problems that in the prior art, due to the fact that the rigid pressing and buffering performance of an iron core is poor, multiple layers of silicon steel sheets forming the iron core are prone to loosening during long-term operation, the air gap of a magnetic circuit is increased, and the service life of the iron core is prolonged are solved. And the no-load loss of the iron core is increased.

The application discloses a kind of multi-stage toughness promotion method and terminal of electric heat comprehensive energy system, with minimum load loss as target to establish objective function, in combination with the constraint condition of network topology of electric heat comprehensive energy system in multi-stage, the constraint condition of distribution system operation model, determine the constraint condition of regional heating system operation model, solve the multi-stage toughness promotion scheme of electric heat comprehensive energy system, realize the multi-stage collaborative toughness promotion of distribution system and regional heating system.Compared with the isolated consideration of distribution network reconstruction in the prior art, the collaborative reconstruction in the application not only redistributes the heat load between heat sources to improve the toughness of the regional heating system, but also optimizes and adjusts the heating structure of the regional heating system to match the network topology changes of the distribution system, effectively controls the fault spread between systems, improves the toughness of the park-level electric heat comprehensive energy system, and is beneficial to reducing the overall load loss of the system, ensuring safe and stable operation of the system.

The invention discloses an electricity-hydrogen coupling system anti-seismic reliability evaluation method and system, and the method comprises the steps: quantifying the fault probability of a power transmission line under a given magnitude and an epicenter position based on an elliptical attenuation model, and constructing a power transmission line fault probability model under an earthquake disaster; in the electricity-hydrogen coupling system, according to the electricity-hydrogen coupling characteristics, an optimal load loss model is established, and the load loss in any given fault state is obtained based on the fault probability model; establishing an uncertainty scene processing model according to the optimal loss load model, generating a related scene, performing scene reduction, and extracting a typical source-load scene set; taking the lost load as a reliability evaluation index, and establishing an anti-seismic reliability evaluation model considering a high-order fault mode; and for scenes in the typical source-load scene set, solving the anti-seismic reliability evaluation model, and calculating a reliability index in a given fault state. According to the method, the calculation efficiency of reliability evaluation of the electricity-hydrogen coupling system under the earthquake disaster can be remarkably improved.

This application discloses a single-core converter transformer. The design includes an iron core, a high-voltage coil and a low-voltage coil mounted on the iron core. The low-voltage coil comprises multiple winding modules. Along the radial direction of the iron core, some winding modules of the low-voltage coil are located inside the high-voltage coil, and others are located outside the high-voltage coil. Thus, this transformer utilizes the spare space on both sides of the inner and outer diameters of the high-voltage coil to distribute multiple winding modules containing basic coils and phase-shifting coils. By adjusting the turns ratio and wiring method of the phase-shifting coil and basic coil in each module, multiple voltages with preset phase differences can be output from a single iron core structure. Multi-pulse rectification can be achieved without the need for multiple transformers in parallel, eliminating the redundant structure caused by multi-machine combinations, significantly reducing material costs and no-load losses, and substantially reducing equipment size and floor space.

The present application relates to the technical field of transformer design, and discloses a capacity determination method, system, medium and equipment of a double anti-star type transformer, the method comprising: obtaining a load loss set of a reference transformer under fundamental working conditions of a to-be-designed transformer, and each harmonic current effective value of the reference transformer under harmonic working conditions of the to-be-designed transformer; determining a harmonic coefficient set of the reference transformer under the harmonic working conditions of the to-be-designed transformer according to the harmonic current effective value and the load loss set; determining a capacity increase coefficient for quantifying the influence of the harmonic working conditions on the capacity of the reference transformer according to the load loss set and the harmonic coefficient set; and determining the capacity of the to-be-designed transformer according to the capacity increase coefficient. The present application can accurately calculate the loss caused by harmonics based on actual harmonic working conditions on site, thereby reasonably determining the transformer capacity and ensuring the operation reliability of the transformer under harmonic working conditions.

The invention discloses an energy-saving transformer based on parallel connection of multiple transformer bodies and a control method thereof.The energy-saving transformer comprises a plurality of transformer body units, an intelligent control unit, a load monitoring module and a temperature sensor, and a high-voltage winding of each transformer body unit is connected with a first bus through a first control switch; the low-voltage winding of each transformer body unit is connected with the second bus through the second control switch, the intelligent control unit is connected with the first switch group, the second switch group, the load monitoring module and the temperature sensor, the load monitoring module is arranged corresponding to the second bus, and the temperature sensor is arranged on each transformer body unit; according to the invention, when the load is light, most of the transformer body units are in a power-off state, so that the overall no-load loss of the transformer is greatly reduced; along with the increase of the load, more transformer body units are gradually invested, the total load is reasonably distributed, the problem that the load loss of a single high-capacity transformer is too high when the transformer is in heavy load is solved, and the comprehensive optimization of no-load loss and load loss is realized.

The application relates to the field of chargers, and particularly discloses an auxiliary power module for a bidirectional direct-current charger, which comprises an input end, a first output end and a second output end, wherein the input end is connected with an external power supply, the first output end is connected with a DC / DC circuit to provide an insulation detection voltage for the bidirectional direct-current charger, and the second output end is connected with an anode of a diode D2; a cathode of the diode D2 is connected with the DC / DC circuit to provide auxiliary power supply when the DC / DC circuit works reversely. In the reverse off-grid mode, the auxiliary power module directly provides the insulation detection voltage required by the power stage DC / DC circuit for the electric vehicle, the no-load loss of the auxiliary power module is basically fixed after the auxiliary power module scheme is fixed, the power of the power module auxiliary power supply of the system control circuit and the DC / DC circuit is relatively fixed, the requirement for the external power supply power is significantly reduced, and therefore the auxiliary power module scheme provided by the application has more universal applicability.

The invention belongs to the technical field of power system monitoring, and particularly relates to a distribution transformer no-load and load loss online measurement method and system, and the method comprises the steps: obtaining the load rate and the total loss of a transformer, and storing the load rate and the total loss in a buffer area; evaluating a load rate distribution condition, extracting a distribution scarcity degree, and performing feature fusion by combining relative measurement precision to generate a data validity weight; constructing an asymmetric amplification coefficient according to the symbol and amplitude of the load rate change rate; fusing the coefficient, the validity weight and a dimensionless normalized residual feature constructed based on a prediction residual to calculate an adaptive forgetting factor; the method is embedded into a covariance updating process of a recursive least square method to realize online identification. The method comprehensively considers the data distribution, the measurement precision and the thermal inertia asymmetric rule, and is beneficial to improving the online identification precision and the dynamic response speed.

The application provides a back-to-back knife switch safety isolation device, and relates to the field of power grid isolation devices.The back-to-back knife switch safety isolation device comprises a knife switch body, a partition insulation cover and an insulation support frame.The knife switch body comprises a framework channel steel arranged on the knife switch body.The insulation support frame comprises an insulation support horizontal rod, one end of the insulation support horizontal rod being clamped into a clamping groove of the framework channel steel, and the other end of the insulation support horizontal rod being fixedly connected to the partition insulation cover.A first insulation support inclined rod is fixedly connected to the partition insulation cover.The partition insulation cover, the first insulation support inclined rod and the insulation support frame form a safety insulation cover for safely isolating operating personnel.The safety isolation device can protect the safety of maintenance personnel when the maintenance personnel approaches a running live part, avoids the risk of electric shock, and effectively solves the problem of load loss caused by busbar distribution and shutdown.

The application provides a kind of ice disaster under the consideration of source and load and primary-secondary fusion power distribution network resilience evaluation method, it is related to power system and its automation technical field.The method comprises: extreme ice and snow disaster under the modeling of physical failure space-time evolution;Node load importance modeling based on multidimensional clustering;Information physical cascading failure deduction of physical outage induced communication interruption;High and medium voltage joint collaborative power supply and load loss calculation;And primary-secondary fusion comprehensive resilience evaluation index system construction.The application overcomes the problems of traditional evaluation method, such as insufficient modeling of disaster evolution, load importance, information-physical coupling and cross-level collaboration, by dynamically deducing the equipment failure timing caused by icing, quantifying the load importance of social attributes and electricity consumption behavior, modeling the communication downtime considering backup power constraints, and optimizing high and medium voltage joint collaborative power supply, significantly improving the accuracy and engineering practicability of power distribution network resilience evaluation under extreme ice and snow disaster.

The invention relates to the technical field of converters, and discloses a self-excited DC-DC converter and a use method thereof, periodic oscillation is realized by positive feedback of a transformer in a self-excited oscillation module, a special PWM control chip is not needed, cost increase and volume occupation caused by the chip can be reduced, static power consumption of the control chip is reduced, no-load loss is reduced, and the self-excited DC-DC converter is suitable for large-scale popularization and application. The self-excited converter meets the scene requirements of low cost and small size, monitors the output voltage in real time through the voltage stabilization feedback module, dynamically adjusts the conduction state of a switching tube by means of a feedback loop, corrects the self-excited oscillation rhythm, effectively solves the problem that the output voltage of a traditional self-excited converter is easy to fluctuate along with the change of a load, guarantees the stability of the output voltage, and improves the reliability of the converter. A complex protection circuit and additional detection and comparison elements are not needed on the whole, the problems of cost rise, fault risk increase and troublesome debugging and maintenance caused by a complex circuit are avoided, and the applicability and reliability in a low-cost and low-complexity scene are improved.

This invention discloses a method and system for controlling the pressure of stacked iron cores to reduce transformer no-load losses. The method includes acquiring the excitation current signal of the stacked iron cores under constant-voltage sinusoidal excitation conditions; extracting the harmonic characteristic components of the signal and decoupling them into stress characterization indicators and air gap characterization indicators, calculating the corresponding hysteresis loss components and air gap additional loss components; gradually increasing the clamping force under a monotonically increasing pressure application path, determining the total loss gradient based on the components at each pressure step, and locating the first optimal pressure point; acquiring pre-configured compensation parameters, performing offset compensation calculations on the first optimal pressure point, obtaining the target curing pressure, and locking it. This invention, through electrical harmonic analysis, can solve the deviations caused by magnetic coupling hysteresis and process relaxation, achieving optimized control of no-load losses.

The application discloses a kind of high-pressure gas-filled cabinet no-load loss energy-saving optimization method and system, by the active loss of branch and load rate data is implemented loss load decoupling analysis and stripping iron loss inherent component forms loss benchmark, rely on sudden drop amplitude, recovery ability and cross-seasonal verification three features identify iron loss sustained low branch to determine the shutdown priority mark;Based on no-load state and steady-state loss baseline, construct hierarchical switching scheduling strategy, combined with approval backlog length and cross-cycle omission rate on scheduling sequence implement priority correction;Through the topology reconfiguration of adjacent branch simultaneous outage, verify positioning conflict inhibition node, combined with holiday power peak superposition heat stable margin evaluation on switching instruction implement safety margin constraint;Finally, through the analysis of decreasing analysis of outage benefit, establish scale critical boundary, and correct the power saving amount prediction with historical underestimation bias, output energy-saving outage instruction under the premise of guaranteeing power supply reliability, realize the continuous systematic optimization of distribution network no-load loss.

The invention provides a single-side power supply power distribution network current instantaneous quick-break protection override trip risk quantitative analysis method, and the method comprises the steps: building a protection range model of a protection constant value based on the topological parameters of a power distribution network and the current instantaneous quick-break protection constant value, and judging whether there is an override trip risk or not according to the protection range model; if the override trip risk exists, quantitatively evaluating the importance of the load to be cut off by mistake due to the override trip action, and obtaining the load loss severity; and combining the protection range of the override trip with the load loss severity, and constructing an override trip risk quantitative evaluation model to quantify the severity of consequences caused by the override trip. According to the method, accurate quantification of the instantaneous quick-break protection override trip risk can be realized, and a basis is provided for adaptability verification and optimization of a protection fixed value.