37results about How to "Good equivalence" patented technology

According to a laboratory simulation test method of control parameters of a dynamical earthing method for a power distribution network neutral point, a power distribution simulation test network (1), automatic tracking arc extinction and compensation complete equipment (2) and an earth fault point (3) are included. By means of the laboratory simulation test method, under the situation of different voltage grades, different power grid insulation structures and different residual flow control modes of arc extinction coil connection, an extinction arc critical value of an instantaneous earth fault of a power distribution network under the different fault point insulation working conditions, and displacement voltage and the corresponding extinction arc time of the power distribution network neutral point when the earth fault recovers are obtained, and therefore the control parameters of the dynamical earthing method for the power distribution network neutral point and the complete equipment are obtained.

The invention provides a service test method of minimum trigger angle of DC converter valve with asymmetric voltage, belonging to the field of power electronics and electric power system simulated test. The invention causes test object voltage to rise to the needed value by triggering an auxiliary valve in proper time within the period of voltage source charging, test object voltage wave shape isapproximate to the practical working condition; DC heavy current is provided by six pulsation rectifier bridges, and the wave shape is almost the same with the practical working condition.

The invention relates to an electrocorrosion acceleration test method for a DC (direct current) porcelain insulator iron cap. The method comprises the following steps: 1, cleaning the dirt on the surface of a porcelain insulator, and placing in a shade for drying and avoiding direct sunlight; 2, sticking a copper sheet to the surface of the porcelain insulator, realizing short circuit for creepage distances of the lower surface and the partial upper surface of the porcelain insulator, and forming a certain distance between the electrode of the copper sheet and the iron cap; 3, placing the porcelain insulator stuck with the copper sheet in a liquid environment simulation chamber, and adopting a dripping method to test, wherein the water drops above the porcelain insulator are dripped to gather in the gap between the iron cap on the lower side of the porcelain insulator and a porcelain surface and form a more concentrated liquid contact point; 4, selecting annual average leakage quantity of electric charge as a basis and testing; and 5, dissecting the electrocorrosion part of the porcelain insulator iron cap, and measuring the length, width, depth and corrosion direction of the electrocorrosion area. According to the invention, the testing steps are rigorous, the practicability is strong, the testing result has better equivalence with the electrocorrosion situation of the porcelain insulator on site, and the electrocorrosion acceleration test method can be widely applicable to the experimental research on the electrocorrosion problem of the DC porcelain insulator iron cap.

The invention provides a DC converter valve minimum triggering angle running test method, belonging to the fields of power electronics and electrical power system simulated experiment. The method realizes the needed minimum triggering voltage by the partial voltage strategy of an auxiliary valve, can meet the sample taking energy by increasing primary oscillating process, and can fully test and verify the triggering reliability of the valve and the accuracy of the design of a valve taking energy unit. DC heavy current is provided by a six-pulse rectifier bridge, and the wave form is basicallythe same as that of the actual working condition.

The invention relates to a composite insulating-material tracking and electrical erosion resistance performance determination method. The method comprises the following steps that (1) a silicone rubber material to be tested is made into a cuboid sample (1) and the sample (1) is numbered; (2) three kinds of filths with different components are configured; (3) the obtained three kinds of filths are sprayed to the three samples (1) respectively and drying is performed; (4) the three samples (1) which are sprayed with the filths are installed on a pressurization platform, after an assigned voltage is pressurized, timekeeping is started and the voltage is maintained to be constant for 15 min, and during this period, an environment temperature is controlled to be 28 DEG C, a relative humidity is 65-70%, a discharge phenomenon is observed and a high voltage end current is recorded. By using the method, the tracking and electrical erosion resistance performance of a silicone rubber composite insulating material operated in a special filth condition can be determined and selected, and an influence of the special filth condition on surface discharge of a composite insulating material surface is considered and equivalence is good.

The invention discloses a ZnO resistor disc absorption energy equivalent analysis method and device and a medium, and the method comprises the steps: obtaining the dynamic volt-ampere characteristicsof a ZnO resistor disc through an impact current test, and drawing a static volt-ampere characteristic curve through the connection of current-voltage maximum points; fitting the static curve to obtain a characteristic formula, and calculating the absorption energy of the resistor disc under a given voltage or current waveform; along with the increase of the head time of the current waveform, theequivalence with the actual waveform is better when absorption energy simulation calculation is carried out through a static volt-ampere characteristic curve. The i resistor disc absorbed energy calculation method based on static volt-ampere characteristic curve fitting is provided for the first time, and is suitable for researching absorbed energy distribution characteristics of a multi-column parallel lightning arrester group. In an extra-high voltage power system, the severe working condition that the lightning arrester faces to absorb huge energy is switching operation or fault, the waveform wave head time is relatively long, and the equivalence of the calculation method is good.

The invention discloses an electric heating simulation heat source for a general purpose isotope heat source. The electric heating simulation heat source comprises a heating element, an electrical insulation layer, a sealing layer, an impact buffer layer, a thermal insulation layer, an atmospheric ablation layer, a loading channel, a power supply lead channel, a wire collecting end, a reinforcingplate, a reinforcing plate screw, a temperature measuring thermocouple and a temperature measuring thermocouple lead channel. The electric heating simulation heat source is developed according to performance parameter of the general purpose heat source (GPHS) of the United States and can be used for a non-nuclear unit test of an isotope power supply system, and meanwhile, the nuclear security andthe test result effectiveness are guaranteed; a problem of poor equivalence of an existing electric heating simulation heat source and the real isotope heat source in the aspects of internal structure, heat distribution, temperature distribution and the like is overcome, the domestic blank is filled, and a technical basis is laid for development of high-power isotope power supply in China.

The invention discloses a personal safety simulation test method. Adjustable resistors, switches, current sensors, voltage sensors and a computer control system are adopted to form the personal safety simulation test device according to the method. After the simulation test device is accessed to a power grid, single-phase grounding tests are performed using different power distribution network neutral point grounding mode and grounding fault processing devices. Tests of step voltage near a grounding fault point are carried out using the different power distribution network neutral point grounding mode and grounding fault processing devices when single-phase broken-line grounding occurs. Current values, voltage values, current duration time and voltage duration time are acquired in the tests, influences of the different power distribution network neutral point grounding mode and grounding fault processing devices on personal safety are assessed, and a proper power distribution network neutral point grounding mode and power distribution network single-phase grounding fault processing device is found out through the tests.

The invention discloses a reduced scale equivalent physical experiment method for an electric transmission line, and belongs to the technical field of high voltage overhead power transmission. The method comprises the steps that firstly, an electric transmission line reduced scale equivalent physical experiment is set in an ultra-long distance and large-capacity half-wavelength (3,000 km) power transmission mode; secondly, three reduced scale schemes of an equal proportion reduced scale, an equal electric conductivity reduced scale and an equal radius reduced scale are provided according to the relation among the reduced scale multiple, frequency and half wavelength of the electric transmission line reduced scale equivalent physical experiment; the equal electric conductivity reduced scale scheme is selected preferentially through calculation and comparison. Compared with an existing method for researching electric transmission line transmission characteristics, the equivalence before and after the electric transmission line reduced scale can be ensured, and a real electric transmission line is accurately simulated. The method has the advantages that a circuit is easy to construct and the equivalence is good, and has the good application prospect on the occasion that the electric transmission line needs to be used for performing an experiment.

The invention relates to a traditional Chinese medicine product, particularly relates to dandelion fluid decoction pieces and preparation method thereof, and belongs to the technical field of traditional Chinese medicine. The dandelion fluid decoction pieces are prepared by a method shown as follows: a. crushing of medicinal materials: traditional decoction pieces of the dandelion or the dandelion after arrangement and choosing are/is crushed and passed through a 60-100 mesh sieve, and a medicinal powder is obtained; b. enzyme inactivating pretreatment: the medicinal powder is heated and treated at 90-100 DEG C for 4-5 hours; c. preparation and cooking of pills: the obtained medicinal powder after the pretreatment is mixed with an appropriate amount of water to obtain a soft material, and granules are produced, the wet granules are put into a centrifugal pill-rolling machine for pill throwing, the prepared wet throwing pills are dried at a temperature range of 55 - 80 DEG C, taken out and placed to the room temperature, then passed through a sieve, and then the throwing pills of 10-24 mesh are thrown to obtain the dandelion fluid decoction pieces. The dandelion fluid decoction pieces have the advantages of small volume, easy storage and packaging, long storage period, low loss of active ingredients and the like.

The invention discloses a transformer turn-to-turn insulation transient impact cumulative effect test system, aiming to solve the technical problems of having little research on the influence of the intrusion wave to the transformer insulation deterioration under different states and how to evaluate the damage of the intrusion wave to the transformer insulation, and being lack of an effective test platform on intrusion wave cumulative effect study. The system includes an impact test loop and a test platform, the impact test loop includes an impact voltage generator which is connected with the high-voltage side of the test platform, the low-voltage side of the test platform is grounded, the test platform includes a turn-to-turn insulation model, electrodes, and a container, the turn-to-turn insulation model is composed of two sections of interchanging leads, the electrodes are fixed at the two ends of the turn-to-turn insulation model, and the turn-to-turn insulation model and the electrodes are arranged inside the container.

The invention belongs to the technical field of diesel engine aftertreatment device aging test and discloses a diesel engine DPF system rapid aging test method and system, a medium and application. The method comprises steps that temperature-time characteristics corresponding to all temperature intervals in the actual aging process of the diesel engine DPF system are converted into multipoint temperature-time characteristics of rapid aging circulation according to the Arrhenius formula; the actual aging information of the diesel vehicle is collected, multi-point rapid aging temperature and corresponding time are calculated based on the collected information and the type of the diesel engine, and an equivalent rapid aging cycle is established; various different DPF parts to be aged are selected, and the selected DPF parts to be aged are preprocessed; a rack rapid aging test is carried out based on the established equivalent rapid aging cycle; after rapid aging, performance evaluation is carried out on each DPF piece. According to the method, the expected aging effect can be quickly and conveniently achieved, and a lot of time, manpower and material resources are saved; The method is closer to the actual aging state of the DPF, and the equivalent effect is good.

The invention provides an LED light bar structure of a frameless light box. The structure comprises a reflection base and a lampshade, the lampshade is installed on the light reflecting base. The lampshade is a transparent cambered surface lampshade; connecting mounting seats are respectively arranged at the two ends of the reflection base and the lampshade; the connecting mounting seat at one endis provided with a convex electrode connecting sheet; a groove is formed in the electrode connecting sheet; the connecting installation seat at the other end is provided with an electrode groove, theelectrode groove is matched with the electrode connecting piece, the upper side and the lower side, opposite to each other, of the connecting mounting seat are provided with an installation groove and a protrusion respectively, the installation groove is matched with the protrusion, and an elastic piece is arranged at the cambered surface connecting position of the connecting mounting seat and the lampshade. The sturcture is convenient to install, and the equivalent effect of the frameless lamp box is better.

The invention discloses a stage difference cooperation and ampere-second characteristic test method for a direct current system device of a power plant, which comprises the following steps of: adding short-circuit grounding protection on the basis of original protection by measuring and calculating short-circuit grounding current and combining comprehensive short-circuit grounding characteristics of an air switch; according to the protection level difference configuration condition of the direct-current circuit breaker with the direct-current system short-circuit accident in the state that the protection value is set to be 1.05 times of the short-circuit current value of the superior and subordinate level difference cooperation test, whether the possibility of override action occurs or not is judged; an ampere-second characteristic test is carried out on a tested direct current circuit breaker, and whether the tested direct current circuit breaker meets a stage difference matching requirement or not is judged according to a measured ampere-second characteristic curve of the direct current circuit breaker; a proper test point is selected, the lower port position of each direct current air switch of the third-stage direct current power supply disc of the direct current power supply system is used as a short circuit point to carry out upper and lower stage difference matching test, short circuit is carried out at the test point, the short circuit current is small, and safety risk control in instrument equipment and the test process is well guaranteed.

The invention discloses a method for preparing a sample wafer for testing the insulating property of an epoxy glue impregnated paper sleeve capacitor core, and the method mainly comprises the steps: crepe paper winding, epoxy impregnation, vacuum curing, axial slicing, surface treatment, surface electrode spraying and the like. Therefore, the test result is closer to the real insulation performance of the insulation material.