45results about How to "Narrow down the scope of failure" patented technology

The invention discloses a chain multi-port grid-connected interface device comprising a commutation chain. The commutation chain is formed by at least two submodule units connected in series in the same direction. The chain multi-port grid-connected interface device further comprises at least one DC converter and at least one DC-AC converter. One end of each DC converter is connected with a DC end of the corresponding submodule unit, and the other end of the DC converter is defined as a DC interaction port of the grid-connected interface device. A DC connection end of each DC-AC converter is connected with a DC end of the corresponding submodule unit, and an AC connection end of the DC-AC converter is defined as an AC interaction port of the grid-connected interface device. The invention also includes a control method using the above chain multi-port grid-connected interface device. The chain multi-port grid-connected interface device of the invention provides the plurality of independent ports for the connection with a low-voltage power supply, a load and an energy storage unit and achieves plug and play, thereby greatly reducing the implementation difficulty and cost.

The invention discloses a high-temperature superconducting cable temperature measurement system, which is applied to interconnected high-temperature superconducting cables and terminal cooling systems. The thermal resistance in the thermal resistance; the optical fiber temperature measurement host, used to receive the temperature measurement information from each measurement point of the low temperature measurement optical fiber; the thermal resistance temperature monitor, used to receive the temperature information from the thermal resistance; the temperature measurement control device, which receives The temperature measurement information and temperature information are evaluated and judged according to the temperature measurement information and temperature information to determine the protection action and protection area of ​​the cable operation control host connected to it, and control the cable operation control host to perform corresponding operations. The invention has the characteristics of convenient use and simple structure, can accurately monitor and locate temperature abnormal points along the high-temperature superconducting cable, is convenient for troubleshooting during superconducting cable maintenance and testing, narrows the scope of failure, and reduces the time for troubleshooting.

A test method for eliminating software abnormalities of gas water heaters, characterized in that: 1. Building a communication platform; 2. Establishing a database, and writing test regulations into the database; 3. Turning on the upper computer and connecting to the database; 4. Writing the software failure rate reference value β, select the regulations and the number of tests n; 5. Determine whether the number of tests j is greater than or equal to n, if yes, go to step 7; ; Seven, statistical failure rate k; Eight: output test results: a, failure rate k=0%, software is normal; b, failure rate k=100%, software failure; c, failure rate 0%≤k≤β and every If the faults are the same, there are other abnormal conditions; d, the failure rate is 0%≤k≤β and each fault is different, then start troubleshooting from the software; e, β≤k≤100%, then start troubleshooting from the software. The invention has the advantages of reducing the range of possible failures of the gas water heater, thereby shortening the test period and improving the test efficiency, which is of great significance to the entire development and design process of the gas water heater.

The invention relates to a fault location method, system and medium of a traction network based on a transient sudden change current, obtains a set of measured currents in each district, and obtains a set of sudden changes in each district; Set, judge whether there is a line short-circuit fault, and find out at least one potential fault area; obtain the target fault area, fault location index, and the difference between the transient mutation accumulation current of the cross-connection line in each potential fault area in turn The difference between the accumulated current and the transient sudden change of the cross-connection line on the opposite side; and then calculate the target fault distance in each potential fault area; obtain the fault distance measurement result of the traction network to be tested according to all target fault distances. The present invention determines the section where the fault is located based on the abrupt current in the transient quantity, and accurately calculates the distance from the fault to the traction station, and realizes the fault detection of different lines of the full-parallel AT traction system in the manner of local communication and distributed fault processing High-precision fault location.

The invention relates to a device for rapidly measuring cable insulation strength. The device comprises a body and a wire-arranging plate, wherein the left side of the body is provided with the wire-arranging plate, fourteen wire-arranging grooves are uniformly formed in the wire-arranging plate, each wire-arranging groove is provided with a corresponding outgoing wire, clamps are arranged above the middle parts of the wire-arranging grooves, an insulating upper plate is arranged above the joint of the left side of the body and the wire-arranging plate, an insulating lower plate is arranged below the insulating upper plate, a sliding groove is formed below the right side of the insulating upper plate and the insulating lower plate, a bottom plate is arranged at the bottom part of the sliding groove, fourteen conducting strips are evenly arranged on the bottom plate, a first telescopic conductor is arranged above the conducting strips, a connecting piece is arranged below the first telescopic conductor, and an insulating tap A is arranged below the connecting piece. The device has the advantages that the working time is greatly shortened, the working efficiency is improved, the labor intensity is reduced, and meanwhile, the working errors caused by connecting and replacing different cables for multiple times are avoided.

The invention discloses a QT-based sodium-sulfur battery management system, which monitors the operating state of the sodium-sulfur battery on the interface of a host computer by collecting information such as the voltage and temperature of a sodium-sulfur battery in real time; specifically, according to the sodium-sulfur battery According to the operation state of the sulfur battery, different operation strategies are implemented. When the battery operation state is abnormal, the relay protection device is activated to protect the operation safety of the system; when the battery operation state is normal, the battery is charged according to the pre-established operation strategy. Discharge and battery temperature rise and fall control, and finally through the real-time monitoring of the working status of the sodium-sulfur battery pack by the host computer, the management and protection of the sodium-sulfur battery operation are realized.

The invention discloses a phase-shifting transformer system which comprises a series branch and a parallel branch. The series branch comprises a seventh isolation disconnecting link, a sixth breaker, a phase shifter body, a ninth breaker and a tenth isolation disconnecting link which are sequentially in serial connection, wherein an eighth grounded disconnecting link is installed between the sixth breaker and the phase shifter body, and an eleventh grounded disconnecting link is installed between the phase shifter body and the ninth breaker; and the parallel branch comprises a second isolation disconnecting link, a bypass breaker and a fourth isolation disconnecting link, wherein a third grounded disconnecting link is installed between the second isolation disconnecting link and the bypass breaker, and a fifth grounded disconnecting link is installed between the bypass breaker and the fourth isolation disconnecting link. The phase-shitting transformer system is capable of meeting the requirement for switching different operation manners of a phase shifter system during normal operation of the phase-shitting transformer system, and guaranteeing the fact that a phase shifter can quickly exit from an electrical power system and is free from affecting normal operation of lines during failure of the phase-shitting transformer system so that safe reliability of the electrical power system is guaranteed. The invention further discloses a control method of the phase-shifting transformer system.