37results about How to "High equivalence" patented technology

The invention relates to a test device and a test method for a full-bridge module of a high-voltage DC circuit breaker. The test device includes a charging circuit, a capacitor C1, a reactor L, a full-bridge module unit, an energy absorber Rz, and a thyristor T; wherein the charging circuit includes DC charging power supply, current limiting resistor R, isolation switch K, discharge resistor R _off , Release switch K2. The test method charges the low-voltage large capacitor through the DC power supply. After the completion, the thyristor triggers the test circuit. The test current is injected into the full-bridge module after being adjusted by the reactance. When the expected breaking current or the maximum breaking time is reached, the breaking is completed. Energy absorbers absorb and limit overvoltages. The topology of the test circuit is simple, the control is simple, the test capacity is low, the test current is large, the breaking current amplitude and di/dt are flexible and adjustable, the test equivalent is high, and it has the ability to comprehensively test the design rationality and operational reliability of the full-bridge module unit ability.

The invention discloses a testing circuit and method for detecting the breaking performance of a DC circuit breaker. The testing circuit is used for effectively replacing a testing circuit which is built for achieving testing of the DC circuit breaker and is large in investment in an equivalent replacement mode. According to the testing circuit, the capacitance of a low-frequency oscillation circuit (or a high-frequency oscillation circuit) is output to the high-voltage end of the DC circuit breaker through a high-voltage ignition ball, an auxiliary switch AB1 and a reactor LS, a series branch circuit formed by an auxiliary switch AB2 and a current limiting reactor is connected with a DC circuit breaker branch circuit in parallel, and the DC circuit breaker branch circuit is a DC circuit breaker protection circuit which can prevent the situation that the DC circuit breaker is excessively burnt or damaged due to the fact that the current through the DC circuit breaker is not shut off. A lightning arrester and a sphere gap are protective devices and can prevent overvoltage from damaging testing equipment. A charging device CD1 is used for charging a capacitor bank CS, and a charging device CD2 is used for charging a capacitor C0. Moreover, through reasonable time sequence setting, a trigger device can act at schedule time to complete testing detection of the DC circuit breaker.

A Chinese speech automatic audiometric method based on a Chinese speech audiometric dynamic word list belongs to the technical field of speech audiometry and is characterized in that a speech audiometric word list composed of a certain audiometric word list with designated length and an implicit word list with uncertain length. The certain audiometric word list refers to a speech audiometric word list formed by conducting listening classification and definition calculation on initials and finals from the angle of acoustic characteristics of a voice file and compiling with the calculation as the core. The implicit word list is expansion of the certain audiometric word list and is a set of compensation test items selected by a subject who has faults in listening of the certain audiometric word list. Initials and finals of the compensation test items and the fault listening items in the certain audiometric word list belong to one initial and final class. Therefore, a plurality of equivalent speech audiometric dynamic word lists are formed, speech audiometric software used for conducting compensation audiometry on the fault listening items in the certain audiometric word list through the implicit word list items is formed, the audiometric process is automatically finished through a software system in one Chinese speech audiometric system. Compared with a traditional audiometric system, the method has the advantages of being high in audiometry efficiency, audiometry credibility and equivalence property.

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 a water and gas pressure adjustment-based phytotron multiple icing type forming method. The water and gas pressure adjustment-based phytotron multiple icing type forming method is implemented through the following test platform, which is composed of an atomizing spray system inside a phytotron and an icing water system and an icing gas system outside the phytotron. The atomizing spray system comprises an icing water atomizing spray nozzle set composed of a plurality of atomizing spray nozzles; the icing water system is connected with the water inlet of every atomizing spray nozzle; the icing gas system is connected with the gas inlet of every atomizing spray nozzle; the icing test is started after the phytotron is cooled to a target temperature. By adjusting the pressure of icing water and icing gas, the number and the diameter of water/fog drops sprayed out of the icing spray nozzles, namely, multiple icing types such as glaze, rime, mixed rime and wet snow can be formed on the surface of a test object, and meanwhile, continuity of the icing types can be achieve in one test, so that equivalence between the icing test result of the phytotron and the actual situation in the natural environment can be enhanced.

The invention discloses a circuit, a method and a device for an over-current turn-off test of a converter valve. The test circuit comprises a direct-current power supply, an isolating switch, a filterreactor and at least two phase units. Each phase unit comprises at least two converter valves, a bridge arm reactor and a load reactor, and the converter valves are connected through the bridge arm reactor; alternating current sides of the at least two phase units are connected through the load reactor; direct current sides of the at least two phase units are connected; and the direct-current power supply is connected with each direct-current side of each phase unit through the isolating switch and the filter reactor. A converter valve maximum continuous operation test and a transistor overcurrent turn-off test can be performed in one circuit at the same time, an equipment utilization rate is improved, and investment cost is reduced; and meanwhile, the test circuit is stable and reliablein operation, and meets technical requirements of the converter valve over-current turn-off test.

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 present invention provides a design and support system for a conveying device that can eliminate the departure between the design of the conveying device, which is made according to the required transportation route and transport capacity, and the actual operation state, so as to realize the smooth transition from the design stage to the actual operation stage; and the device can speculate and evaluate the influence of the changes of the applied devices, the device number, the arrangement and so on in the actual operation stage. The virtual conveying device, which is designed according tothe required transportation route and the transport capacity, can orderly reflect the test results of performances of the manufactured actual equipment and the test results of performances of the actual equipment in the actual operation, thereby implementing the actual operation process.

The invention discloses a multi-axis load equivalent processing method and device, computer equipment and a medium, and aims to improve the equivalence and accuracy of equivalent loads loaded by a test bed. The method comprises the following steps: projecting a multi-axis load into a load space to obtain decomposed loads in a plurality of directions; performing pseudo damage calculation on the decomposition loads in the multiple directions to obtain pseudo damage of the decomposition loads; determining the total pseudo damage of the decomposition load according to the pseudo damage of the decomposition load and the cycle index of the multi-axis load; initializing equivalent load cycle index, and constructing an equivalent load formula in a preset signal form corresponding to decompositionloads in a plurality of directions; determining a total pseudo damage formula corresponding to the equivalent load according to the equivalent load cycle index and the equivalent load formula; makingthe total pseudo damage of the decomposition loads in the multiple directions to be equal to the total pseudo damage formula corresponding to the equivalent loads, so that a load equivalent relation formula is obtained, and iterative solution is conducted to obtain parameters of the equivalent load formula; and obtaining an equivalent load corresponding to the equivalent load formula according tothe parameters.

The invention discloses an active intervention type arc extinguishing device test system, which belongs to the field of substation automatic detection systems and comprises a substation subsystem, a line subsystem and a fault simulation subsystem. The substation subsystem comprises a laboratory incoming line isolation power supply, a primary switch device, a secondary monitoring and protection device and a neutral point operation mode simulation unit. The line subsystem adopts an outgoing line simulation mode shared by real lines and simulation lines, including three real lines and three simulation lines. The fault simulation subsystem comprises a fault simulation unit, a current transformer and a voltage transformer. The system capacity of the test system of the power distribution network fault detection and processing device can be expanded, and the equivalence and repeatability of the test environment of the power distribution network are improved, so that the test capability of the power distribution network fault detection device and the credibility of the test result are improved; a professional, efficient and authoritative test detection platform is provided for power distribution network fault processing key technology research, related standard formulation and device detection.