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50results about How to "Shorten power outage maintenance time" patented technology
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On-line detection method of metal oxide arrester insulating property influencing factor
ActiveCN102621457AShorten power outage maintenance timeExtended service lifeTesting dielectric strengthCurrent/voltage measurementMetal oxide surge arresterTotal current
The invention discloses an on-line detection method of a metal oxide arrester insulating property influencing factor. The on-line detection method comprises the following steps of: firstly obtaining total current i x (t) of leakage current from a metal oxide arrester ground downlead, and separating resistive current i r (t) from the total current; calculating a total current amplitude value I x, a resistive current amplitude value I r, fundamental current amplitude value I r 1 in the resistive current and a triple-frequency harmonics electric current amplitude value I r3 in the resistive current; and further calculating an aging coefficient beta of a metal oxide arrester, if the I x is greater than a setting value or the I r is greater than the setting value, judging the insulating property of the metal oxide arrester to be poor, and then forming criteria according to the I r, the I r 1, the I r 3 and beta. The method can exactly distinguish the influencing factor which causes the insulating property of the metal oxide arrester to get poor, is beneficial to shortening power off overhaul time, prolongs the service life of metal oxide, and has very important meanings of reducing power off loss and guaranteeing an electric system to safely and economically operate.
Owner:STATE GRID CORP OF CHINA +1
Fault on-line monitoring device of high-voltage breaker and monitoring method thereof
ActiveCN105403831AImprove measurement errorHigh measurement accuracyCircuit interrupters testingData acquisitionEngineering
The invention discloses a fault on-line monitoring device of a high-voltage breaker and a monitoring method thereof. An opening Hall current transformer, a closing Hall current transformer and the normally-opened contact of a high-voltage breaker auxiliary switch are connected with a controller via wires. The controller is connected with a display terminal. The monitoring method comprises steps of acquiring data; calculating basic data; judging direct-current grounding faults of a high-voltage breaker mechanism and turn-to-turn short circuit faults of electromagnetic coils; judging the 'opened-after-closed' fault of the circuit breaker caused by a failure to keep an opening tripper of the high-voltage breaker mechanism to be closed; judging the fault of a failure of restoration caused by deformation of a reset spring of the high-voltage breaker mechanism; judging the jam fault of the tripper of the high-voltage breaker mechanism; and judging the jam fault of an iron core of an electromagnet. The fault on-line monitoring device is simple in structure and high in measuring precision; data is precise; the calibration method is simple and easy; and technical problems in the prior art are overcome.
Owner:GUIZHOU POWER GRID CO LTD ZUNYI POWER SUPPLY BUREAU
Multi-joint robot for mounting and demounting ground wires
InactiveCN104842336AChange riskShorten power outage maintenance timeManipulatorControl systemRemote control
The invention relates to the field of electric power, in particular to equipment for mounting and demounting ground wires of high-voltage transmission lines and discloses a multi-joint robot for mounting and demounting ground wires. The multi-joint robot for mounting and demounting the ground wires comprises a robot platform and a platform control system thereof. The robot platform comprises a mobile platform, a lifting platform, a control cabinet, a multi-joint arm and a wire hanging clamp. A horizontal supporting table is arranged at the top of the lifting platform which is mounted on the mobile platform, the control cabinet is fixed onto the supporting table, the top of the control cabinet is connected with the multi-joint arm through a bearing, and a tail joint portion of the multi-joint arm is connected with the wire hanging clamp. The multi-joint arm is formed by serial connection of multiple joint portions through bearings, and each joint portion is coupled with a driving motor. The multi-joint robot for mounting and demounting the ground wires with a visual remote control function has the advantage that dangers of traditional manual mounting and demounting of the ground wires of the high-voltage transmission lines are thoroughly eliminated in operations of mounting and demounting of the ground wires of high-voltage substations.
Owner:SHENZHEN SUNROAD TECH
Method for comprehensively analyzing and diagnosing deformation of winding of transformer
ActiveCN103884943AShorten power outage maintenance timeReduce external power outage timeElectrical testingFrequency bandDecision-making
Provided is a method for comprehensively analyzing and diagnosing deformation of a winding of a transformer. The method for comprehensively analyzing and diagnosing the deformation of the winding of the transformer comprises the stages of establishing a collecting and diagnosing system, collecting data of the winding of the transformer, carrying out logic analysis, area judgment, tendency judgment and comprehensive diagnosis on data of all phases and all frequency bands in frequency response tests, and the like. Through the method for comprehensively analyzing and diagnosing the deformation of the winding of the transformer, correct analyzing and judging conclusions of the deformation testing data of the transformer can be given timely and effectively through a comprehensive intelligent specialist distinguish library, the steps of draining oil, lifting a cover and then checking the winding of the transformer are avoided, the power outage overhaul time of the fault transformer is shortened greatly, powerful decision making bases are provided for the technological decision making of leaders, and a key function is performed for reducing external power outage time by the fault transformer.
Owner:STATE GRID CORP OF CHINA +1
Intelligent recloser
InactiveCN101710685AExtended service lifeAvoid the impact of high currentEmergency protective arrangements for automatic disconnectionFault locationElectronic switchRecloser
The invention provides an intelligent recloser, which comprises a breaker switch, an operating mechanism, an upper disconnecting switch, a lower disconnecting switch, a current transformer, a high-voltage fuse, a voltage transformer, an electronic switch and an intelligent device, wherein the breaker switch is connected to a main circuit and positioned between the upper disconnecting switch and the lower disconnecting switch; the electronic switch is connected in parallel with the breaker switch; the current transformer is sleeved on a circuit branch of the breaker switch; the breaker switch is connected in parallel with the electronic switch; the intelligent device is connected to the current transformer and the operating mechanism; and the operating mechanism is connected with the breaker switch. The intelligent recloser can intelligently detect whether a fault exists, and can be reclosed or closed correspondingly to a latch, thereby greatly reducing harm to dash current, prolonging service life of the switch and greatly shortening interruption maintenance time.
Owner:深圳市联创知识产权服务中心
Electrified pressure leakage blocking device and method for gas leakage of sulfur hexafluoride electrical equipment
InactiveCN105207090AEnsure personal safetyShorten power outage maintenance timeSwitchgearSulfur hexafluorideElectric power system
The invention discloses an electrified pressure leakage blocking device and method for gas leakage of sulfur hexafluoride electrical equipment. The device comprises a cutoff valve arranged at the leakage point of the sulfur hexafluoride electrical equipment, an insulating fixing rod used for moving the cutoff valve to the leakage point of the sulfur hexafluoride electrical equipment and an insulating glue-injecting gun used for fixing the cutoff valve to the leakage point of the sulfur hexafluoride electrical equipment. The device and method have the advantages that when the leakage point of the sulfur hexafluoride electrical equipment is electrified or the safe distance between a leakage blocking maintainer and the electrified portion does not meet requirements, by the adoption of the device and method, in maintaining, it is unnecessary to power off the sulfur hexafluoride electrical equipment in leakage, pressure reduction or recycling of sulfur hexafluoride is not needed, maintaining is convenient and rapid, the device and method are suitable for electrical equipment made of metal, ceramic, cement and other various materials, on the premise that personal safety of the leakage blocking maintainer is ensured, shutdown maintaining time of an electrical system is shortened, and power-supply reliability of a power net is improved.
Owner:STATE GRID CORP OF CHINA +2
Method and system for comprehensive inspection of power equipment
PendingCN112731086AImprove reliabilityGuaranteed stable supplyMicro-sized aircraftSatellite radio beaconingSound sourcesEngineering
The invention discloses a method and system for comprehensive inspection of power equipment, and the method comprises the steps: collecting a surface temperature signal and an ultrasonic signal of detection equipment and the operation condition data of the detection equipment, and respectively generating an infrared thermal imaging image and a sound wave image based on the surface temperature signal and the ultrasonic signal; sending the infrared thermal imaging image, the sound wave image and the detection equipment operation condition data to a cloud platform for storage; compositing a positioning sound source signal in the sound wave image to the infrared thermal imaging image to generate a composite thermal image; extracting a sound wave fingerprint based on the sound wave image; and judging the fault severity of the detection equipment based on the operation condition data of the detection equipment and the composite thermal image, and judging the fault type of the detection equipment according to the sound wave fingerprint.
Owner:STATE GRID SHANGHAI ENERGY INTERCONNECTION RES INST CO LTD +1
High-voltage direct-current power transmission TTM board card fault positioning system and fault positioning method thereof
ActiveCN106646099AImprove maintenance efficiencyShorten power outage maintenance timeFault location by conductor typesCritical signalThyristor
The invention relates to a high-voltage direct-current power transmission TTM board card fault positioning system and fault positioning method thereof. The system includes a wave recording monitoring system, a VBE and a valve module which are connected in sequence, a thyristor triggering monitoring unit TTM board card in the valve module collects and processes a node signal that a converter valve needs to monitor, soon afterwards a processing judgment signal is transmitted to a signal collection communication board, and the signal is stored in a storage chip of the signal collection communication board; when a triggering monitoring case of the VBE detects that the TTM board card of a certain stage or multistage thyristor sends an overvoltage protection return pulse, energy taking return pulse disappears or the signal collection communication board detects a key signal abnormality of itself, wave recording is automatically started or wave recording is started in a manual mode; and a fault recording device performs fault positioning. The high-voltage direct-current power transmission TTM board card fault positioning system provided by the invention solves the problem that in a high-voltage direct-current power transmission converter valve body, under the working condition of strong electromagnetic field interference, tracking of a TTM board card key signal node cannot be realized in a fault section.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
Test method of leakage current component of metal oxide arrester
ActiveCN103207307AAccurate measurementTimely detection of transient changes in insulation performanceCurrent/voltage measurementCapacitanceMathematical model
The invention discloses a test method of leakage current component of a metal oxide arrester. The method includes collecting the leakage current of the three-phase metal oxide arrester and the voltage of an A-phase high voltage side, wherein the leakage current of the three-phase metal oxide arrester passes through a down lead of the three-phase metal oxide arrester at t sampling time; calculating the phase angle of the voltage of the A-phase high voltage side of the metal oxide arrester; and selecting the sampling time of the voltage waveform of the A-phase high voltage side in any zero crossing point within a fundamental wave period and the voltage waveform of the A-phase high voltage side in the zero crossing point at the sampling time, and calculating the capacitive current component and resistive current component of the leakage current of the three-phase metal oxide arrester according to a mathematical model. According to the method, the influence of interphase coupling capacitance is taken into consideration on the basis of the mathematical model, accurate testing of the entire process of the transient state of the leakage current component of the three-phase metal oxide arrester is realized, the insulation condition changes of the metal oxide arrester can be found in time, and a reliable basis for rapid planning of maintenance schemes of the metal oxide arrester is provided.
Owner:STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
Protection device of closing coil
ActiveCN103022985AAvoid burning phenomenonSimple designEmergency protective circuit arrangementsClosing loopsVoltage variation
The invention discloses a protection device of a closing coil. The device comprises a normally closed contact of a relay JD1 which is in series with a closing coil HD in a divide-shut circuit of a switch, and partial pressure sampling circuits, inverse circuits and a controlling protection circuit which are in series connection to control the on-off of the normally closed contact point of the relay JD1. wherein one of the two partial pressure sampling circuits is connected with the closing coil HD in the divide-shut circuit of the switch, the other is connected with an opening coil TQ in a closing circuit; the two inverse circuits are respectively connected with the two partial pressure sampling circuits and are used to transfer the output voltage of the closing circuit into the voltage capable of being received by the controlling protection circuit; the controlling protection circuit is used to control the on and off of the relay JD1 according to the collected voltage and preset time of the two partial pressure sampling circuits. The protection device of the closing coil is based on the principle of collecting voltage changes of the before and after patch of switch controlling closing loop and can timely control the disconnection of the circuit of the closing coil when the closing is not successful, thereby reliably avoiding the phenomenon that the closing coil is burned.
Owner:STATE GRID SICHUAN ELECTRIC POWER COMPANY NEIJIANG POWER SUPPLY +1
A device for simulating the running state of handcart switchgear
ActiveCN102279360AEasy to moveQuality improvementSwitchgear with withdrawable carriageCircuit interrupters testingLower limitAviation
The present invention discloses a device for simulating the operation state of a handcart switch cabinet, comprising a base plate (1) with pulleys (2), wherein the two sides of the upper surface of the base plate are respectively provided with a column (3) and a transparent plate (4), the column (3) is sleeved with a slidable upper transverse slat (5) with an upper limiting device and a slidable lower transverse slat (6) with a lower limiting device (8) from top to bottom, and the outer side surfaces of the transverse slat (5) and the lower transverse slat (6) are respectively provided with an upper moving contact (9) and a lower moving contact (10). The handcart body (14) of a handcart switch platform is provided with rollers (15) on the bottom, adjustable struts (16) are connected between a guide rail (13) and the handcart body (14), one side of the upper surface of the guide rail (13) is provided with an aviation plug extension slot (17), the two side surfaces of the base plate (1)are slidable on the guide rail (13), and the column (3) and the transparent plate (4) are movable along with the base plate (1) in the left-right direction.
Owner:STATE GRID CORP OF CHINA +1
Method for diagnosing impact on metallic oxide arrester electrification test from inter-phase interference
ActiveCN103176083AShorten power outage maintenance timeAvoid misjudgmentVoltage-current phase angleElectrical testingPower flowDiagnosis methods
The invention discloses a method for diagnosing an impact on a metallic oxide arrester electrification test from inter-phase interference. The method includes: acquiring instantaneous voltage values at various sampling times from leads on high-voltages sides of an A-phase metallic oxide arrester and a C-phase metallic oxide arrester, calculating phase angles of instantaneous voltage via the Fourier algorithm, acquiring instantaneous leakage current values at various sampling times from grounding down leads of the A-phase metallic oxide arrester and the C-phase metallic oxide arrester, separating resistive current from instantaneous leakage current, calculating a phase angle of the resistive current via the Fourier algorithm, calculating an interference coefficient, and diagnosing by comparing the interference coefficient with a setting valve. By the method, the impact on the metallic oxide arrester electrification test from the inter-phase interference is accurately diagnosed, if any inter-phase interference leads a metallic oxide arrester electrification test result to be abnormal, the diagnosing result can provide powerful reference to testing workers for accurately analyzing insulating performance of the metallic oxide arresters, and testing workers' judgment error caused by the abnormal testing result due to the inter-phase interference can be effectively avoided.
Owner:STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
Digital protection automatic test device and test method based on IEC61850
InactiveCN105158619AShorten power outage maintenance timeGuaranteed test integrityElectrical testingEquipment under testOptimal test
The invention discloses a digital protection automatic test device and test method based on IEC61850, relating to the relay protection test field, and aims to realize automatic relay protection test. The test device comprises a digital protection device, a host computer and a lower computer; the lower computer is in connection with the process level of a device to be tested; the digital protection device, the host computer and the lower computer realize mutual data interaction; the host computer is in connection with a station control bus interface through an ethernet interface. The test device integrates a station control level and the process level, automatically identifies a protection type according to a debugging leading principle, automatically generates a debugging scheme, automatically combines an optimum test project and test formwork, automatically generates a fault report and a motion report, guarantees test integrity, substantially improves work efficiency, and reduces equipment power failure maintenance time.
Owner:STATE GRID CORP OF CHINA +1
Detection method for insulation performance of arrester considering tertiary voltage harmonic influence
InactiveCN103777102AShorten power outage maintenance timeExtended service lifeElectrical testingCapacitanceCoupling
The invention discloses a detection method for insulation performance of an arrester considering tertiary voltage harmonic influence. The detection method includes the steps that a full current flowing through the arrester is measured, a resistive current is extracted from the full current, the amplitude of the full current and the amplitude of the resistive current are calculated, the amplitude of a fundamental wave resistive current and the amplitude of a triple harmonic resistive current are calculated, insulation performance factors of the arrester are calculated, and detection criterions are formed by the amplitude of the full current, the amplitude of the resistive current, the amplitude of the triple harmonic resistive current and the insulation performance factors of the arrester to judge the insulation performance of the arrester accurately. Performance detection is not affected by tertiary voltage harmonic and interphase coupling capacitance, a detection result is accurate and reliable, the reliable basis is provided for making an arrester maintaining scheme, and the detection method is beneficial for shortening the outage maintenance time and prolonging service life of the arrester and is of important significance in reducing outage loss and guaranteeing safe operation of electrical equipment.
Owner:STATE GRID CORP OF CHINA +2
Dismounting method of energy storage spring for 10 kV metalclad withdraw switchgear circuit breaker
ActiveCN110091279AEasy to operate on siteImprove securityMetal-working hand toolsEngineeringSwitchgear
The invention provides a dismounting method of an energy storage spring for a 10 kV metalclad withdraw switchgear circuit breaker. The method is implemented with a special tool. The special tool includes a body, a driving assembly mounted on the body, two sets of clamping stretching-contracting assemblies drivingly connected to the driving assembly and an auxiliary stretching-contracting assemblywhich is drivingly connected to the driving assembly and pinned to the two sets of the clamping stretching -contracting assemblies. The dismounting method includes cutting off a power supply of the circuit breaker, removing a handcart air plug of the circuit breaker, manually opening and closing a switch to release energy of the circuit breaker mechanism, adjusting the special tool to a ready state, holding and stretching the energy storage spring by using the special tool, dismounting a connecting lever fixing nut and removing a rotating connecting lever when the stretching length of the energy storage spring facilitates the removal of the rotating connecting lever arranged on the lower end of the energy storage spring, removing the energy storage spring for maintenance and the like. Thedismounting method of the energy storage spring for the 10 kV metalclad withdraw switchgear circuit breaker can be suitable for the dismounting of conventional various types of energy storage springs,is strong in applicability and convenient in operation, and improves the work efficiency.
Owner:JIANGSU ELECTRIC POWER CO +1
Vehicle-mounted megger and dielectric loss forward and reverse connection measuring and wiring centralized conversion device
ActiveCN105759085AShorten power outage maintenance timeImprove economic efficiencyMeasurement instrument housingElectrical resistance and conductanceDielectric loss
The invention discloses a vehicle-mounted megger and dielectric loss forward and reverse connection measuring and wiring centralized conversion device.The device comprises a high-voltage signal conversion module and a high-low signal conversion module which are connected; the high-voltage signal conversion module is used for realizing conversion between a high-voltage signal of a dielectric loss tester and a high-voltage signal of a megger, the high-voltage signal conversion module leads the high-voltage signal to the high-low signal conversion module, and the high-low signal conversion module is used for realizing conversion between the high-voltage signal and a dielectric loss forward connection signal.Through the device, intelligent measurement of one-time wiring of a sleeve body dielectric loss (forward connection method), a sleeve end screen reverse connection dielectric loss (end screen ground dielectric loss) and sleeve end screen ground insulation resistance can be realized, preceding-stage intelligent switchover is provided for one-time wiring of a whole transformer, it is feasible to shorten work time and reduce the work danger coefficient in an actual transformer debugging test, work efficiency is improved, meanwhile, power-failure overhaul time of the transformer is shortened, and economic efficiency of the transformer is improved.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
Cable fault full-automatic online navigation positioning system
InactiveCN108594080AShorten power outage maintenance timeShorten the timeTransmission systemsFault location by conductor typesSignal processing circuitsComputer module
The invention relates to a cable fault full-automatic online navigation positioning system, comprising a case, a transmitting cellphone, and a receiving cellphone; the case is provided with a liquid crystal screen and a keyboard; a signal acquisition unit, a signal processing circuit, a CPU (central processing unit), a storage and a WIFI module are integrated in the case, wherein the signal acquisition unit is connected with the signal processing circuit, the signal processing circuit is connected with the CPU, and the CPU is connected with the storage, the liquid crystal screen, the keyboard,and the WIFI module. The system herein is used for monitoring insulation value of a cable and fault point distances of the cable online in real time, and transmitting positions of the cable fault points and a cable trajectory to the signal acquisition unit in the case in the first place; the signal processing circuit transmits the positions and the cable trajectory to the CPU; the CPU transmits the processed data to the transmitting cellphone and the receiving cellphone through the WIFI module; the data are displayed on related map software by the receiving cellphone, and navigation is provided to allow reach to the positions of the cable fault points.
Owner:武汉国鼎科技有限公司
Fixing structure for detachable cable protection pipe
PendingCN106505504AImprove efficiencyIncrease costCable installations in underground tubesPetroleum engineering
The invention discloses a fixing structure for a detachable cable protection pipe, including a holt hoop iron I corresponding to a pole and towel pair. One end of the holt hoop iron is provided with an extension section. A cable protection pipe body is arranged at one side of the extension section. With the adoption of cooperation between the arc clamp loop and the extension section, the cable protection pipe body is tightly clamped. The fixing structure subversively changes the overall pipe-shaped structure of the original cable protection pipe, and the cable protection pipe is designed to have the detachable structure by a mode that one divides into two, so that in the installation or the later replacement process, the efficiency is greatly improved, and the cost is reduced. The fixing structure is easy to manufacture and strong in practicality.
Owner:GUIYANG POWER SUPPLY BUREAU OF GUIZHOU POWER GRID CO LTD
Transformer substation operation inspection robot and electrified area isolation method thereof
PendingCN111913182AHigh precisionImprove the level of intelligenceNavigational calculation instrumentsAcoustic wave reradiationTransformerElectric power industry
The invention discloses a transformer substation operation inspection robot and an electrified area isolation method thereof, and aims to solve the technical problem that an electrified area is difficult to isolate accurately in the transformer substation operation inspection process. The robot comprises a robot body and an electrified area isolation device, the electrified area isolation device comprises an ultrasonic sensing module, an image recognition module, an electric field measurement module, a sound-light alarm module and a control module, a robot action route is planned according toultrasonic ranging, electric field ranging and image recognition, and the robot is controlled to give an alarm or be locked. According to the invention, the electrified area of a transformer substation can be actively isolated, the overall intelligent level of inspection equipment in the power industry is improved, the personal safety of operators is ensured, and the power failure maintenance timeis shortened.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH +3
Plug-in front switch device
ActiveCN105374639BReduce labor intensityEasy access for safety inspectionProtective switch terminals/connectionsPower flowEngineering
The present invention provides a plug-in meter front switch device. The plug-in meter front switch device comprises a breaker and an insulating pedestal; the breaker includes three phase input terminals and three phase outlet terminals; the pedestal is provided with six sockets; the three phase input terminals and the three phase outlet terminals are respectively plugged on the six sockets to install and fix the breaker; and three phase incoming lines and three phase outgoing lines are respectively connected with the six sockets and are connected with the three phase input terminals and the three phase outlet terminals of the breaker in a one-to-one correspondence relationship through the six sockets. The maintenance and the replacement of the plug-in meter front switch device are very easy, flexible and reliable, with no need for turning off a superior power supply; and moreover, the plug-in meter front switch device is safer and more reliable through adoption of a breaker for controlling switching of a current, and once the installation of the plug-in meter front switch device is completed, three phase incoming lines and three phase outgoing lines are free of demolition so that aging and corrosion of junctions are avoided, therefore potential risks are greatly reduced and work safety is improved.
Owner:STATE GRID CORP OF CHINA +1
Auxiliary device for installation of current transformer in central cabinet
ActiveCN104821501BReduce labor intensityImprove assembly reliabilityLifting framesSwitchgearInductorSwitchgear
An auxiliary device for mounting a current transformer of a middle-arranged switchgear comprises the components of an elevator, a supporting platform, a vertical sliding table, a transverse sliding table, a turntable and a positioning unit. According to the specific mounting environment of the middle-arranged switchgear and the moving direction of a current inductor in actual operation, quick feeding and micro feeding adjustment in a vertical surface to a current inductor mounting screw hole relative to the threaded hole position in assembling maintenance are realized. Transverse feeding motion, longitudinal feeding motion and rotation motion in the horizontal surface are realized. A requirement for realizing correspondence between the current transformer threaded hole and the assembling threaded hole of the middle-arranged switchgear is satisfied through adjusting feeding in multiple directions and rotation alignment of the auxiliary device and placing the current transformer on the turntable in the mounting process. Lifting of the current transformer through manpower is not required, thereby reducing labor intensity; improving assembling reliability; shortening time length in mounting, maintenance and replacement; and shortening power-off maintenance time.
Owner:PINGYIN POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +1
Extra-high-tension GIS self-contained insulation test platform based on oil-immersed reactor
PendingCN109375081AGuarantee the construction progress of the projectShorten power outage maintenance timeTesting dielectric strengthVoltage dividersHydraulic cylinderTransformer
The invention provides an extra-high-tension GIS self-contained insulation test platform based on an oil-immersed reactor. The platform comprises an insulation tester and a movable platform capable ofself-support lifting; the movable platform comprises a platform chassis, a main hydraulic cylinder arranged on the platform chassis, a carriage and a pedestal; the insulation tester is arranged on the movable platform via the carriage and pedestal, and the carriage and pedestal can be overturned for 90 degree and thus arranged vertically by the main hydraulic cylinder; and the insulation tester comprises a resonance reactor, a capacitive attenuator for measurement and a telescopic grading ring, a preset gap is kept between the resonance reactor and capacitive attenuator, one end of the resonance reactor and one end of the capacitive attenuator are fixed to the pedestal, and the other ends of the resonance reactor and capacitive attenuator are provided with the telescopic grading ring. Onsite equipment assembling and hoisting are not needed, the space occupied by equipment is reduced greatly, rapid transfer in a transformation station can be realized, and onsite AC withstand voltage test of extra-high-tension GIS equipment can be carried out safely and conveniently in the transformer station.
Owner:STATE GRID HUBEI ELECTRIC POWER RES INST +4
Lightning arrester testing apparatus
InactiveCN105807164ARealize remote controlEasy to carryElectrical testingEngineeringAlternating current
The invention relates to a lightning arrester testing apparatus which comprises a box body with an openable-closable upper cover.An alternating current motor is detachably arranged on the lower end face of the upper cover of the box body is arranged in the box body, a rotating shaft of the alternating current motor vertically and outwards penetrates through the upper box of the box body, a rotating platform is detachably arranged on the rotating shaft, and a group of lightning arrester placement holes are formed in the rotating platform.A detachable pressurizing insulation rod and a discharge lever are further arranged on the box body, and a pressurizing spring contact and a grounding spring contact which are matched with a lightning arrester to be tested are arranged at the upper end of the pressurizing insulation rod.A discharge spring contact matched with the lightning arrester to be tested is arranged at the upper end of the discharge lever.The grounding spring contact and a discharging spring contact are grounded.The problem that an existing lightning arrester testing apparatus is not reasonable enough and potential safety hazards exist can be solved, and the lightning arrester testing apparatus is simple in whole structure and convenient to achieve and can be widely applied to the field of lightning arrester tests.
Owner:STATE GRID CORP OF CHINA +1
A Comprehensive Analysis and Diagnosis Method of Transformer Winding Deformation
ActiveCN103884943BShorten power outage maintenance timeReduce external power outage timeElectrical testingEngineeringConductor Coil
Provided is a method for comprehensively analyzing and diagnosing deformation of a winding of a transformer. The method for comprehensively analyzing and diagnosing the deformation of the winding of the transformer comprises the stages of establishing a collecting and diagnosing system, collecting data of the winding of the transformer, carrying out logic analysis, area judgment, tendency judgment and comprehensive diagnosis on data of all phases and all frequency bands in frequency response tests, and the like. Through the method for comprehensively analyzing and diagnosing the deformation of the winding of the transformer, correct analyzing and judging conclusions of the deformation testing data of the transformer can be given timely and effectively through a comprehensive intelligent specialist distinguish library, the steps of draining oil, lifting a cover and then checking the winding of the transformer are avoided, the power outage overhaul time of the fault transformer is shortened greatly, powerful decision making bases are provided for the technological decision making of leaders, and a key function is performed for reducing external power outage time by the fault transformer.
Owner:STATE GRID CORP OF CHINA +1
Closing coil protection device
ActiveCN103022985BAvoid burning phenomenonSimple designEmergency protective circuit arrangementsClosing loopsEngineering
The invention discloses a protection device of a closing coil. The device comprises a normally closed contact of a relay JD1 which is in series with a closing coil HD in a divide-shut circuit of a switch, and partial pressure sampling circuits, inverse circuits and a controlling protection circuit which are in series connection to control the on-off of the normally closed contact point of the relay JD1. wherein one of the two partial pressure sampling circuits is connected with the closing coil HD in the divide-shut circuit of the switch, the other is connected with an opening coil TQ in a closing circuit; the two inverse circuits are respectively connected with the two partial pressure sampling circuits and are used to transfer the output voltage of the closing circuit into the voltage capable of being received by the controlling protection circuit; the controlling protection circuit is used to control the on and off of the relay JD1 according to the collected voltage and preset time of the two partial pressure sampling circuits. The protection device of the closing coil is based on the principle of collecting voltage changes of the before and after patch of switch controlling closing loop and can timely control the disconnection of the circuit of the closing coil when the closing is not successful, thereby reliably avoiding the phenomenon that the closing coil is burned.
Owner:STATE GRID SICHUAN ELECTRIC POWER COMPANY NEIJIANG POWER SUPPLY +1
Diagnosis method for the influence of interphase interference on the live test of metal oxide arresters
ActiveCN103176083BShorten power outage maintenance timeAvoid misjudgmentVoltage-current phase angleElectrical testingEngineeringMetal oxide surge arrester
Owner:STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
Assembled high-voltage isolation switch conductive disc and installation method
PendingCN110911205AFlexible disassemblyHigh mechanical strengthAir-break switch detailsContact electric connectionCircular discEngineering
The invention discloses an assembled high-voltage isolation switch conductive disc which comprises two semi-circular disc mounting bases which are used in cooperation with each other and can be combined into a circular structure, a plurality of mounting holes are formed in the semi-circular disc mounting bases in the circumferential radial direction, and conductive roller mechanisms are arranged in the mounting holes. Each conductive roller mechanism comprises a touch roller head arranged at the bottom of the mounting hole, a guide seat matched with the touch roller head for use, a spring arranged at the end part of the guide seat, and an adjusting bolt for adjusting the compression amount of the spring; according to the technical scheme, on one hand, rapid installation can be realized, the power failure time is reduced, and the human, financial and material costs are reduced; on the other hand, operation reliability is high, corrosion resistance is high, mechanical strength is high, deformation is not likely to happen, the overhaul period is long, and maintenance is convenient.
Owner:STATE GRID CORP OF CHINA +1
Portable carbon resistance welding device
ActiveCN113953614AEasy to carryAvoid failureHeating appliancesMetal working apparatusCarbon resistanceEngineering
The invention provides a portable carbon resistance welding device, and relates to the technical field of welding devices. The portable carbon resistance welding device comprises an accommodating box body. A rectangular through opening is formed in the lower part of the front end face of the accommodating box body, and a shielding assembly is mounted in the position, outside the rectangular through opening, of the front end face of the accommodating box body; and an E-shaped through opening is formed in the right end face of the accommodating box body, an air blowing mechanism is arranged at the position, located at the E-shaped through opening, of the right end face of the accommodating box body, a cleaning part is arranged at the right end of the air blowing mechanism, and a limiting part is installed on the rear end face of the accommodating box body. Through the arrangement of the accommodating box body and a battery assembly, the welding device cannot be limited when being used outdoors; and through arrangement of the shielding assembly, a large number of bolts and other fasteners do not need to be disassembled through tools during maintenance of the welding device, so that the convenience during maintenance of the welding device is improved, and the problems that an existing welding device is limited during field use and is not easy to disassemble during maintenance, and convenience during maintenance is lowered are solved.
Owner:STATE GRID SHANDONG ELECTRIC POWER
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Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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