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

The invention discloses an equipment port failure detecting and positioning method and an equipment port failure detecting and positioning system, which are used for improving port failure detecting and positioning efficiency. According to the method, after a first port and a second port are connected through a physical transmission medium, a first node of a self-starting loop is set if the amount of error messages received by the first port exceeds a preset threshold; the first port or the second port sends the data massages with the preset amount to an opposite port; if the first port is used for sending massage to the opposite port and the error massage is received, the fault in a link between the first node and an MAC (Media Access Control) chip of the first port is determined; and otherwise, the fault in a link between the first node and an MAC chip of the second port is determined; and if the second port is used for sending the message to the opposite port and the error message is received, the fault of the link between the first node and the MAC chip of the second port is determined, and otherwise, the fault of the link between the first node and the MAC chip of the first port is determined.

Disclosed is a single power supply 10-kilovolt circuit protection three-stage configuration and fixed value setting method. Two section switches are arranged on a 10kV circuit main line, and three-stage protection configuration is performed for protecting a circuit with a length of greater than 6km; the circuit distance of three-stage switches is not less than 2km; a second-stage switch and the third-stage switch on the main line are positioned close to positions of three dividing points on the main line; and then the first-stage switch, the second-stage switch and the third-stage switch are subjected to protection fixed value setting, and reclosure is set. The three-stage protection configuration and fixed value setting method for the 10kV single power supply circuit powered by 110kV and 220kV is proposed; the circuits of each stage of protection fixed values is set by the setting method, so that complete protection matching of circuit sections can be realized; in faults, a fault range can be greatly reduced; and by matching with reclosure setting, a fault-less region can be recovered within the shortest time.

The invention discloses a high-frequency trail transmission positioning system and a positioning method. The high-frequency trail transmission positioning method comprises the following steps: a signal output end transmits test signals at least containing AC signals in a set frequency to a to-be-tested line; a signal detection end is close to the to-be-tested line, the AC signals in the set frequency in the to-be-tested line are sensed, and detection signals are obtained; the detection signals are processed to obtain detection data and position information; the detection data and the positioninformation are transmitted to a mobile terminal; the mobile terminal receives the detection data and the position information; the mobile terminal compares the detection data and a preset value; andif the detection data are consistent with the preset value, the mobile terminal generates fault signals, and the fault signals and the corresponding position information are outputted. The high-frequency trail transmission positioning method can quickly and accurately check a fault point, fault checking by manual line patrol is not needed, and the fault checking efficiency is improved.

The invention discloses a PCBA short-circuit point detection method. The method comprises the following steps: selecting a circuit network, setting a base point, setting a measurement point, selectinga measurement instrument, selecting accessories, measuring resistance, judging resistance, updating the measurement point according to the resistance, comparing the distance between the measurement points, judging a short-circuit region, repeatedly detecting and obtaining a final conclusion. The beneficial effects of the invention are that: a plurality of measurement points are arranged; the fault range can be quickly reduced, thus improving detection efficiency, and the frequency required by detection is reduced; accessory with consistent specification, the consistency of influence factors of accessories can be ensured; the detection method is advantaged in that the same external influence on different areas during detection is guaranteed, detection precision is improved, through settingmultiple times of detection, multiple times of detection results are integrated, detection correctness is guaranteed, detection accuracy is improved, short circuit points do not need to be checked one by one, and printed circuit board short circuit point detection efficiency is improved.

The invention provides a whole body surface contamination monitor and an over-voltage protection method of the whole body surface contamination monitor. An over-voltage protection device is connected to each output interface of a power supply of the whole body surface contamination monitor in series, when it is detected that a current voltage output by the corresponding output interface exceeds a preset voltage threshold value, only the corresponding output interface of the power supply is controlled to be disconnected from a corresponding connecting device, the failure range is reduced, maintenance staff can quickly troubleshoot failure devices accordingly, the failure processing speed is greatly increased, failure time is shortened, and therefore detection efficiency is improved.

A method and system for automatically positioning failure, which contains executing warning relativity analysis to obtain origin resulting in warning, obtaining the all reason resulting in warning, determining whether the failure reason resulting in the failure by matching the practical test result with expected result of test action.

The invention discloses IO equipment and a microcomputer protection device in the technical field of power system automation, and the IO equipment comprises a core board and an extensible bottom board, the core board is connected with the extensible bottom board through a data line, receives external data collected by circuits with different functions, and transmits the external data to the extensible bottom board through a data line; a control command is sent to the circuit execution units with different functions, and the extensible bottom plate is matched with the core plate to complete data input, output and isolation. Various changes can be achieved according to requirements, expandability is high, IO equipment with new characteristics can be added only by designing an expansion bottom plate, and the development scale can be reduced.

The invention provides a multi-line electric leakage synchronous detection device of 220V alternating current lines. The multi-line electric leakage synchronous detection device comprises a plurality of single electric leakage signal sampling circuits connected in parallel and connected with a main control unit. Each sampling circuit comprises a current transformer, a signal amplification and processing module and a signal conversion processing module and is connected with a data transmission, recording and management module, wherein the signal amplification and processing module comprises an amplifier circuit, and a resistance-capacitance filter circuit; the signal conversion processing module employs an ADC branch control unit; the current transformer, the amplifier circuit, the filter circuit, the ADC branch control unit and the main control unit are connected successively. The main control unit is connected with a clock circuit and a displayer. The device can completely record and store the dynamic state electric leakage current and the corresponding electric leakage occurrence time of each power supply line in real time, provide accurate and reliable maintenance information, furthest narrow the line fault coverage and improve the accuracy and efficiency of line maintenance.

The invention provides a self-healing capacitor element which comprises a shell body, wherein a cylinder formed by at least two layers of metallized films in a wound mode is arranged in the shell body in a closed mode. Two ends of the cylinder are connected with a first electrode and a second electrode respectively, the metallized films at least comprise a flat type metallized film layer and an isolated type metallized film layer, and at least one flat type metallized film layer is arranged between two adjacent isolated type metallized films. Due to the fact that the adopted isolated metallized films carry out isolation and partition on the flat type metallized films, electric damage of single-point healing to peripheral regions is reduced, the fault area of a capacitor is shortened, and energy in healing is also limited. Therefore, self-healing failure is greatly reduced or eliminated, self-healing performance is improved, operating safety of the capacitor is guaranteed, and the service life is prolonged.

The invention discloses a transmission line malfunction monitoring auxiliary device, comprising an electrical signal acquisition circuit, a phase conversion circuit, an alternating-direct current conversion circuit and a comparison output circuit which are electrically connected in sequence, wherein the electrical signal acquisition circuit is used for collecting a secondary phase current and a secondary phase voltage; the phase conversion circuit is used for performing phase conversion on the collected secondary phase current to obtain a first voltage vector U after phase conversion, and performing reduction voltage on the collected corresponding secondary phase voltage to obtain a second voltage vector U' after reduction voltage; the alternating-direct current conversion circuit is used for performing rectification on a vector U+U' and a vector U-U' to respectively obtain a first direct current voltage U2 and a second direct current voltage U3; the comparison output circuit is used for comparing the first direct current voltage U2 and the second direct current voltage U3, and outputting an electric signal to an external monitoring terminal according to a comparative result. On basis of the original protection device, according to the scheme, the time for recovering the power supply of regions without malfunction is effectively shortened, and the malfunction scope is effectively shrunk.

The invention discloses a power distribution line fault positioning method. Data information of existing scheduling automation, distribution network automation, measurement automation systems and thelike is sufficiently utilized, and acquired data is subjected to comprehensive analysis to rapidly reduce a power distribution line fault range, so that a fault position is rapidly and accurately positioned. The power distribution line fault positioning method disclosed by the invention is simple in positioning process and feasible; a positioning result of the fault position is high and the methodis convenient for wide popularization and application.

The invention discloses a substation power system and fire-fighting system information fused interaction control device. Automatic data information of a substation power system and information of a traditional firefighting automatic system of a substation are collected, fused and normalized, so that fire alarm of the transformer substation can be realized more accurately and comprehensively, corresponding firefighting equipment in the substation can be started to control the fire when the traditional firefighting automatic system is started for mistake or fails in starting, and thus, operationcondition of electrical equipment in the substation is protected and controlled. The substation power system and fire-fighting system information fused interaction control device meets the requirements of a load transformer substation power system monitoring specification and a fire-fighting automatic control system, can realize active fire fighting by the power automatic system of the substation, and ensures stable operation.

The invention discloses a helicopter hydraulic steering engine tester and a testing method, which belong to the technical field of steering engine test. The tester comprises a box body and a main circuit, the input end of an input unit of the main circuit is used for being connected with a power supply on a helicopter, and the output end of the input unit of the main circuit is connected with oneend of each indication unit; the other end of each indication unit is connected with an output unit; the input end of a voltage regulation unit is connected with the input unit, the output end of thevoltage regulation unit is connected with one end of a polarity selection switch, the other end of the polarity selection switch is connected with one end of each servo valve switch, and the other endof each servo valve switch is connected with the corresponding end of the output unit; the first input end of each balancing valve switch is connected with the output end of the voltage regulation unit, the second input end of each balancing valve switch is connected with the other end of the polarity selection switch, and the output end of each balancing valve switch is connected with the corresponding end of the output unit. The tester has the advantages of simple structure, simplicity and convenience in operation, safety, reliability, high test efficiency and the like.

The invention discloses a conventional direct-current valve area fault positioning method. The method comprises the following steps: firstly, constructing a linear rectification function according to the one-way conduction characteristic of a thyristor; constructing criteria corresponding to different areas of the valve area according to the Kirchhoff's current law by utilizing the valve area measuring points, and judging the specific position of the valve area fault according to the differential flow calculated according to the criteria; and reducing misjudgment by further utilizing the conduction time sequence of the converter valve and the existing protection, and reducing the fault range defined by the method. The partitions corresponding to the criterion are accurate to the phase by using the conduction time sequence of the converter valve, and the adverse effect of commutation failure on criterion use is eliminated by combining the existing direct current protection. In the analysis of an actual fault event, the valve area fault positioning algorithm provided by the invention gives a valve area fault positioning result which is accurate to the phase. Analysis and simulation tests show that the method has practical value.

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.