30results about How to "Shorten troubleshooting time" patented technology

The invention provides a charging pile fault prediction method and device based on a Markov chain, and the method comprises: obtaining a state vector of a target charging pile in an initial time period, and enabling the state vector to serve as the initial state probability distribution of a preset charging pile Markov chain prediction model; wherein the Markov chain prediction model of the charging pile is used for representing a discrete event random process in which a non-fault state and at least one fault state of the charging pile are mutually converted and different fault states of the charging pile are mutually converted; and according to the initial state probability distribution and the Markov chain prediction model, determining the probability that the target charging pile has atleast one fault in a prediction time period. Automatic fault prediction of the charging pile can be achieved, the prediction process is efficient, the prediction result is accurate, and then timely and targeted maintenance can be conducted on the fault of the charging pile.

The invention discloses a positive rail grounding fault positioning method of a fourth rail backflow traction power supply system, which specifically comprises the following steps of: determining which power supply section a fault section is located in and an uplink or downlink line of the section by using differential current, and determining a fault position by using a fault positioning formulaprovided by the invention. The method is not affected by traction loads, the unit resistance of the positive rail and the unit resistance of the negative rail can be different, the fault patrol time is shortened, and the system operation efficiency and safety are improved.

The invention provides a fault line selection system for a single phase ground fault in a low current grounded system. The fault line selection system involves that: a sampling unit completes the operation of single acquisition and algorithm processing, etc, and a man-machine unit is mainly responsible for displaying a man-machine interface and bulk memory storing, and an acquisition unit and the man-machine unit exchange information through an ARM board. The sampling unit has the advantages of strong capability of data processing, capability of processing large amount of data, and capability of fast real-time processing, etc, and thus a high-precision data acquisition system is constituted, and the acquisition precision and the acquisition speed are increased. The mutual connection among the sampling unit and the general-purpose ARM board and the man-machine unit enables the apparatus to work in an efficient and reliable manner. At the same time, the sampling unit, the ARM board and the man-machine unit also work independently and perform processing work individually. A photoelectric coupled isolate circuit which is also provided in the apparatus increases the flexibility and anti-interference of the apparatus. According to the invention, the apparatus increases the accuracy of determining a line grounding fault, shortens the time for fault inquiry, reduces daily maintenance work loads of distribution network lines, increases work efficiency and guarantees the reliable operation of the distribution network system.

The invention relates to an alarm distinguishing method for turnout split and loss representation of urban rail transit, which comprises the following steps that: step 1) during access handling or turnout operation, an interlocking system sends out a turnout action instruction, and a turnout and related equipment perform corresponding actions; (2) the interlocking system judges the positioning andreversing states of the turnout by collecting nodes of a DBJ representation relay or an FBJ representation relay; (3) the interlocking system judges whether the turnout loss state exceeds a set valueor not, and if yes, it is determined that the turnout is in a turnout split state; and (4) the interlocking system collects a turnout area occupation clearing indication relay, further determines whether it is occupation split or loss representation split, and transmits information to an ATS, and the ATS performs related split alarm or loss representation alarm. Compared with the prior art, the method has the advantages that the fault influence operation time can be reduced as much as possible, and the fault first-aid repair time can be shortened.

The invention relates to a belt wheel rotation manual control device. The device consists of a forward button 1, a forward contactor 2, a reverse button 3, a reverse contactor 4, a stop button 5, a current transformer 6, an ammeter 7, a control panel 8, and a signal control cable 9, wherein the forward contactor 2 and the reverse contactor 4 are used for controlling the forward and reverse rotation of a motor, and manual rotation of a belt wheel is replaced.; the current transformer 6 is used for detecting a current value of the motor; and the ammeter 7 is used for displaying the current value of the motor. The belt wheel rotation manual control device has main advantages that a test method is scientific and accurate; and manual rotation of the belt wheel is replaced, so that the failure eliminating time is reduced.

The invention relates to a low-current grounding fault positioning and alarming method based on a fault indicator. The method comprises the following steps: synchronously acquiring current data and voltage data of each phase of a low-current grounding system line in a fault period in real time; when it is determined that the small-current grounding fault occurs, injecting a capacitive load into abus-side non-fault phase of the transformer substation with the fault, and exiting the capacitive load after a certain period of time; determining a specific fault area of the fault by analyzing the current variation within a certain delay time before and after the capacitive load injection; and sending the fault information to a line patrol personnel mobile terminal. According to the invention, the fault occurrence area and the fault occurrence time can be timely, rapidly and accurately determined, and the fault occurrence rate is reduced.

The invention relates to a ground fault detection method for a a power distribution network power transmission line. The method comprises the following steps: acquiring a three-phase current value inthe power transmission line in real time; detecting a ground fault according to the sampled three-phase current, and obtaining a time point t corresponding to the moment when the ground fault is justdetected; determining whether the fault is a single-phase ground fault or a two-phase ground fault according to the three phase current break variables and the current amplitudes at the moment t; andafter the ground fault is determined, generating a fault alarm signal and sending the fault alarm signal to an intelligent terminal corresponding to the branch line through a wireless communication device. According to the invention, the fault occurrence area and the fault occurrence time can be timely, rapidly and accurately determined, and the fault occurrence rate is reduced.