5results about How to "Guarantee test safety" patented technology

The invention provides a non-power-cut test method for mutual inductance parameters of a power transmission line under excitation of different-frequency signals and a related device, and solves the problems of difficulty in accompanying stop and high safety risk of adjacent lines. The method comprises the following steps: selecting one circuit in the same corridor for power failure, connecting the head end with an induced electricity suppression device, and performing three-phase short-circuit grounding at the tail end; injecting a different-frequency sinusoidal current of 45-55Hz into the power failure line; the synchronous measurement device collects head and tail voltage and current of a running line based on a satellite synchronous clock; extracting pilot frequency signals through two-stage notch filtering and Fourier transform; and different-frequency zero-sequence self-impedance and mutual impedance are calculated and converted into power-frequency impedance. According to the invention, accurate test without power failure can be realized, and safety and power supply reliability are guaranteed.

This invention discloses a universal control interface system for converters used in AC drive system test benches, comprising a control unit, a main disconnection status signal circuit, a synchronization signal circuit, a mains current signal circuit, and a VCB enable signal circuit. The main disconnection status signal circuit includes a normally open contact status circuit, a normally closed contact status circuit, a second switch, a first rotary switch, and a second rotary switch. One end of the normally open contact status circuit is connected to multiple normally open main disconnection contacts connected in parallel, and one end of the normally closed contact status circuit is connected to multiple normally closed main disconnection contacts connected in series. The normally open contacts of the second switch are connected in parallel to the normally open contact status circuit, and the normally closed contacts are connected in series to the normally closed contact status circuit. The second rotary switch is located in the normally closed contact status circuit and is connected in parallel with one or more normally closed main disconnection contacts. This invention has advantages such as enabling interface conversion between different test bench main circuit topologies and different test samples, improving test efficiency, and enhancing the modularity of test bench design.

This invention discloses a test device and method for the impact performance of an engine conical wall structure, belonging to the technical field of aero-engine structural strength testing. The device includes: a hammer for generating a falling impact; a transition assembly for an interference fit connection with the front end of the conical wall structure; a bracket for a fixed connection with the rear end of the conical wall structure; a protective assembly positioned along the hammer's descent path and on the side of the conical wall structure to catch the hammer after the conical wall structure fractures; and a protective box positioned directly below the conical wall structure to receive the failed falling conical wall structure. The method includes static load calibration and dynamic impact testing steps. This invention can meet the requirements for both split and integrated installation of conical wall structures, achieving a stable connection and dual safety protection under high-energy impacts. It can simultaneously complete static load calibration and dynamic impact integrated testing, ensuring safe and reliable testing.

The present application belongs to the technical field of high-speed wind tunnel test, and discloses a high-speed transverse gas jet test device and test method. The test device comprises a test model located in the test section of a high-speed wind tunnel, the inner cavity of the test model is sequentially fixed with a balance and a support rod from front to back, the rear section of the balance is sleeved with a heat insulation sleeve, a gas generator is installed on the support rod, and the rear section of the support rod is connected with a high-speed wind tunnel support mechanism. The test device further comprises a fuel storage tank and an air storage tank which are placed outside the high-speed wind tunnel and provide fuel and air for the gas generator, and an ignition controller of the gas generator. The test method establishes a safety interlocking test timing, ensures the reliability and safety of the high-speed transverse gas jet test, provides a stable time of the hot jet of 10s order, a stable chamber pressure, non-toxic and harmless gas, can simulate the specific impulse, temperature, specific heat ratio and secondary combustion effect of the real high-speed aircraft jet gas, and has engineering practical value.

This invention relates to an insulation support platform for frequency converters used in withstand voltage testing, belonging to the field of electrical equipment testing technology. The invention includes a platform assembly; a telescopic mounting assembly is connected to the bottom of the platform assembly, the telescopic mounting assembly including a height adjustment mechanism with at least two adjustable levels, allowing the height of the platform assembly to be adjusted in real time via the height adjustment mechanism; an insulating pad assembly is installed between the telescopic mounting assembly and the ground, the insulating pad assembly including an insulating pad body, the surface of the insulating pad body abutting against the telescopic mounting assembly having insulating protrusions, the insulating pad assembly used to block current conduction between the telescopic mounting assembly and the ground; an equipment fixing assembly for fixing the test equipment is detachably connected to the platform assembly; at least one test placement assembly for placing test items is detachably connected to the platform assembly. This invention ensures the safe and reliable conduct of withstand voltage tests.