4results about How to "Reduce fault detection time" patented technology

This invention relates to the field of relay protection technology for tugboat DC power grids. It provides a microgrid short-circuit fault protection method based on the difference in current change rate, comprising the following steps: continuously collecting current data; setting two sliding windows to record historical current information; fitting the current data of the first sliding window according to a fitting formula; calculating the current change rate of the first sliding window using the fitting formula; obtaining the operating quantity of the longitudinal differential protection based on the current change rate; calculating the sum of the maximum value of the differential current and the average absolute value of the current at both ends of the cable based on the current data of the second sliding window; obtaining the braking quantity of the longitudinal differential protection from the sum of the maximum value of the differential current and the average absolute value of the current at both ends of the cable; and determining that a bipolar short-circuit fault has occurred in the cable and disconnecting the faulty line when the operating quantity and the braking quantity meet predetermined conditions. This method can expand the compatibility range with changes in transition resistance while shortening the fault detection time, thereby improving the reliability and stability of the DC microgrid.

The invention relates to a machine room ceiling condensation and leakage monitoring and processing method, device and equipment and a medium. The method comprises the steps that environment temperature and humidity data and leakage detection signals in a machine room are collected in real time; determining a condensation risk index corresponding to each cabinet in the machine room through the temperature and humidity data and preset equipment arrangement parameters; and determining a corresponding dehumidification strategy and / or drainage strategy based on the condensation risk index and the leakage detection signal, and correspondingly processing the machine room. The device has the effect of improving the machine room ceiling accumulated water and leakage treatment efficiency.

The application relates to a kind of phased array wireless network communication equipment transceiving channel fault online detection methods, and relates to the field of phased array equipment fault detection.In the communication monitoring air interface message interface, monitoring information field and monitoring waveform are designed, when two nodes in the network communicate, the transmitting node air interface sends the communication signal containing monitoring information and monitoring waveform, the receiving node sends the channel number of each receiving channel and the amplitude information of the received single-frequency waveform to the back-end processor, according to the transmitting signal power, relative distance, antenna gain, transmitting / receiving channel gain, the theoretical value of the received signal power can be obtained, the theoretical value is compared with the received signal power obtained by the receiving channel, and whether the transmitting or receiving channel is normal is determined through algorithm and criterion, so that the transceiving channel fault online real-time detection of phased array communication equipment in the process of wireless communication is finally completed.

The utility model discloses a meteorological fault detection equipment belongs to meteorological fault maintenance technical field, and its technical scheme main points include meteorological fault diagnostic instrument, the rear side swing joint of meteorological fault diagnostic instrument has the accomodating fixed establishment, the front side swing joint of meteorological fault diagnostic instrument has the sealed dustproof mechanism, can through the rear side of diagnostic instrument and set up the support box and the accomodating arc groove clamp rod, the arc groove clamp rod accomodates under normal condition and does not affect the carrying, pulls out the arc groove clamp rod in the operation time, and starts drive motor, can firmly hold diagnostic instrument on the maintenance box or outside clippable point, so that the staff need not long time to lift heavy instrument, avoids the instrument from falling off, damaging because of fatigue, eliminates the risk of high altitude projectile, simultaneously, after the instrument is fixed, personnel operation is more convenient, has improved the detection efficiency, can through setting up the sealing box and rotatable sealing cover outside diagnostic instrument, can tightly wrap the wiring port usually, prevents dust, impurity from entering.