CN105548816A - Intelligent detection device and system for hidden troubles of grounding grid - Google Patents
Intelligent detection device and system for hidden troubles of grounding grid Download PDFInfo
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- CN105548816A CN105548816A CN201610027441.XA CN201610027441A CN105548816A CN 105548816 A CN105548816 A CN 105548816A CN 201610027441 A CN201610027441 A CN 201610027441A CN 105548816 A CN105548816 A CN 105548816A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention discloses an intelligent detection device and system for hidden troubles of a grounding grid. The device comprises a collection unit, a computer, and a signal source. The collection unit comprises an analog switch, a filter module, a collection module, a single-chip microcomputer, a relay control module, a storage module, and a 485 interface module. The detection method comprises the following steps: circuit connection, power-up detection, sequential detection, mapping, defining and corresponding measurement points, and the judging of the operation condition of the grounding grid. The device and method reduce the length of a test cable, shorten the wiring time, can visually observe a flowing path of a current in the grounding grid, determine the corrosion and breakage conditions of the grounding grid, and make accurate and safe assessment for the grounding grid.
Description
Technical field
The invention belongs to large-scale grounding network state-detection field, relate to a kind of grounded screen hidden danger intelligent detection device and detection method.
Background technology
In generating plant, transformer station, electric railway and communication system, normally run in order to ensure equipment and personnel and electric power, electronic equipment safety, need to arrange large-scale grounded screen.Grounded screen is embedded in underground, its covert property determines the complexity that duty detects, the effect of earthing device is very important, once there is corrosion cracking hidden danger in earthing device, light then the equipment that affects runs, serious will expand accident scope, causes equipment to damage and casualties, so constantly studying for the detection method of ground net corrosion breaking degree all the time.Because grounded screen is imbedded in the characteristic of underground, can only be detected by down conductor, the down conductor quantity of large-scale grounding network is a lot, causes detecting the folding and unfolding of duration distance, mobile test cable becomes the time in testing and take than maximum work, usually will take more than 90%.And when the long distance of more cable is laid, cable can produce winding, causes detection efficiency obviously to decline.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of power frequency of using as detection signal, increase electric current, the distribution of detection current balance type, distributed grounded screen hidden danger intelligent detection device and detection method.
For solving the problems of the technologies described above adopted technical scheme be: a kind of grounded screen hidden danger intelligent detection device, comprises collecting unit, computing machine and signal source; Described collecting unit comprises analog switch, filtration module, acquisition module, single-chip microcomputer, relay control module, memory module and 485 interface modules;
The input end of described analog switch is connected with the downlead of earthing device by wire; The output terminal of described analog switch connects the corresponding port of described acquisition module through described filtration module; The corresponding port of single-chip microcomputer described in the output termination of described acquisition module;
Described memory module is connected with the corresponding port of described single-chip microcomputer;
The corresponding control output end of single-chip microcomputer described in the control inputs termination of described relay control module; The control output end of described relay control module connects the corresponding port of described signal source; The respective input of acquisition module described in the output termination of described signal source;
Described computing machine is connected with the corresponding port of single-chip microcomputer by 485 interface modules.
Described signal source comprises air switch, contactor, shutting-brake control switch, separating brake gauge tap, transformer T, Current Transmit and pilot lamp H;
The quiet knee-joint three-phase supply A phase of the first contact QF-1 of described air switch holds L1; The swing arm of the first contact QF-1 of described air switch connects the one end on the described former limit of transformer T through the first main contacts KM-1 of described contactor;
The quiet knee-joint three-phase supply B phase of the second contact QF-2 of described air switch holds L2; The swing arm of the second contact QF-2 of described air switch connects the other end on the described former limit of transformer T through the second main contacts KM-2 of described contactor;
The quiet knee-joint three-phase supply C phase of the 3rd contact QF-3 of described air switch holds L3; The swing arm of the 3rd contact QF-3 of described air switch connects the FireWire port port of the coil of described contactor through the normally closed contact KF-1 of described separating brake gauge tap;
The quiet knee-joint three-phase supply zero phase end N of the 4th contact QF-4 of described air switch; The swing arm of the 4th contact QF-4 of described air switch connects the zero line port of the coil of described contactor through the normally opened contact KH-1 of described shutting-brake control switch;
The normally opened contact KM-3 of described contactor is connected in parallel on the two ends of the normally opened contact KH-1 of described shutting-brake control switch;
Described pilot lamp H is connected between the swing arm of the swing arm of the 3rd contact QF-3 of described air switch and the 4th contact QF-4 of air switch;
The secondary output voltage terminal U of described transformer T connects the respective input of described acquisition module;
The output terminal I of described Current Transmit connects the respective input of described acquisition module.
Described relay control module comprises triode Q1 and triode Q2;
The base stage of described triode Q1 and triode Q2 connects the corresponding port of described single-chip microcomputer respectively; The emitter ground connection respectively of described triode Q1 and triode Q2;
The coil of described separating brake gauge tap is connected between the collector of VCC12V power supply and described triode Q1;
The coil of described shutting-brake control switch is connected on described between VCC12V power supply and the collector of described triode Q2.
The model of described analog switch is CD4067; The model of described filtration module is MAX262; The model of acquisition module is CS5550; The model of described single-chip microcomputer is TMS320; The model of described 485 interface modules is RSM485ST; The model of described memory module is IDT3834; The model of described triode Q1 and triode Q2 is respectively 9013.
Utilize grounded screen hidden danger intelligent detection device to carry out the detection method detected, comprise the steps:
(1) connection: multiple collecting unit is separately positioned on transformer station's zones of different, collecting unit and computing machine adopt 485 communications to transmit image data respectively; Collecting unit is utilized to connect the corresponding device of grounded screen downlead, be connected on the grounded screen downlead of neutral point of main transformer by the reference edge in two of signal source High-current output ends by power lead, the end that powers up in two High-current output ends of signal source is connected on transforming plant apparatus down conductor to be measured simultaneously; Record the corresponding down conductor positional information of harvester passage and power up end position information;
(2) electro-detection is added: in computing machine, control software design is installed; Described control software design exports steering order to the single-chip microcomputer of collecting unit, and single-chip microcomputer exports control signal to signal source, applies big current to grounded screen; Simultaneously described control software design transmitting time synch command is to collecting unit, and collecting unit receives real-time parallel collection after synch command and uploading data, and computing machine real-time reception also preserves the magnitude of voltage of each port of collecting unit;
(3) sequence detection: the mobile end that powers up is on next one transforming plant apparatus down conductor to be measured, and record powers up end position information; Perform the operation of step (2), detect all downleads successively;
(4) draw: utilize icon storehouse and basic drawing instrument to draw out transformer station's layout of detected plant stand; Described transformer station layout comprises the positional information of the interior layout information of transformer station, the operational outfit positional information of transformer station and ground wire downlead;
(5) definition and corresponding measurement point: the measurement data points defining grounded screen downlead in described transformer station layout, then receives on grounded screen measured point by each measurement data points by measurement port correspondence;
(6) numerical value of each port of pick-up unit obtained according to control terminal judges the operation conditions of grounded screen;
If the magnitude of voltage approximately equal between each check point that device obtains, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect is in good condition;
If between any two check points that device obtains or region there is obvious cliff of displacement formula pressure reduction in magnitude of voltage, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect exists hidden danger defect, and trouble spot be present in there is pressure reduction between two check points or region, the corrosion of pressure reduction larger explanation trouble spot is more serious simultaneously, when pressure reduction is close to 50V, illustrate rupture completely in trouble spot;
If all there is obvious pressure reduction between multiple check points that control terminal obtains, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect has many places hidden danger defect.
The present invention the invention has the beneficial effects as follows: normally can run when not affecting grounded screen, use power frequency as detection signal, increase electric current, detection current balance type distributes, distributed pick-up unit detects grounded screen, pick-up unit can be distributed in region to be measured, substantially reduce the length of test cable, greatly shorten wiring time, intuitively seen by test data simultaneously and judge ground net corrosion crack conditions according to balanced degree in the path that electric current flows through in grounded screen; For grounded screen makes correct, safe assessment; Distributed Design can access multiple stage pick-up unit to adapt to the large-scale grounding network of different scales.
The present invention, without the need to excavating grounded screen, can detect it when grounded screen is normally run, the present invention can the function of Software Create report so can report without delay and defect make product from detecting that obtaining result is very rapidly; Simultaneously, grounded screen detects when system cloud gray model, zero-sequence current on transformer station's inner high voltage bus and transformer and grounded screen can produce complicated electric jamming, affect measuring accuracy, when detecting the electric current hour of grounded screen input, grounded screen feedback voltage is subject to electric jamming and cause cannot Judging fault.The present invention adopts big current technology, feedback voltage increased, effectively resists interference, improve fault detect resolution, really accomplish accurately to judge grounded screen fault, the defect that can grounded screen be reported timely and accurately to exist, for grounded screen makes correct safety assessment;
The present invention controls pick-up unit and signal source by control terminal, staff by site layout project well after namely can carry out data acquisition, data analysis by control terminal to grounded screen, and the fault detected is verified, the basic robotization realizing detecting, significantly reduces the workload of staff.
The present invention, by adopting distributed capture device, greatly can shorten the length of test cable, avoid the time waste that Test Field produces because of cable winds.Multiple stage distributed capture device can be replaced by quick-replaceable at the scene simultaneously, greatly can improve operational reliability and the field maintemance convenience of single unit system.
Detecting step of the present invention is simple, can carry out accurate safety detection to grounded screen, ensures the degree of accuracy detected, and testing process is simple simultaneously, easy to operate.The present invention is applicable to detect the large-scale grounding network of various electric power system or electricity generation system.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is signal source circuit schematic diagram.
Fig. 3 is shutting-brake control switch, separating brake gauge tap, relay control module and single-chip microcomputer annexation schematic diagram.
Fig. 4 is layout test pattern.
Fig. 5 is test curve figure.
Embodiment
Below in conjunction with Fig. 1-5 and embodiment, the present invention will be further described.
The present embodiment is a kind of grounded screen hidden danger intelligent detection device, comprises collecting unit, computing machine and signal source; Described collecting unit comprises analog switch, filtration module, acquisition module, single-chip microcomputer, relay control module, memory module and 485 interface modules;
The input end of described analog switch is connected with the downlead of earthing device by wire; The output terminal of described analog switch connects the corresponding port of described acquisition module through described filtration module; The corresponding port of single-chip microcomputer described in the output termination of described acquisition module;
Described memory module is connected with the corresponding port of described single-chip microcomputer;
The corresponding control output end of single-chip microcomputer described in the control inputs termination of described relay control module; The control output end of described relay control module connects the corresponding port of described signal source; The respective input of acquisition module described in the output termination of described signal source;
Described computing machine is connected with the corresponding port of single-chip microcomputer by 485 interface modules.
Described signal source comprises air switch, contactor, shutting-brake control switch, separating brake gauge tap, transformer T, Current Transmit and pilot lamp H;
The quiet knee-joint three-phase supply A phase of the first contact QF-1 of described air switch holds L1; The swing arm of the first contact QF-1 of described air switch connects the one end on the described former limit of transformer T through the first main contacts KM-1 of described contactor;
The quiet knee-joint three-phase supply B phase of the second contact QF-2 of described air switch holds L2; The swing arm of the second contact QF-2 of described air switch connects the other end on the described former limit of transformer T through the second main contacts KM-2 of described contactor;
The quiet knee-joint three-phase supply C phase of the 3rd contact QF-3 of described air switch holds L3; The swing arm of the 3rd contact QF-3 of described air switch connects the FireWire port port of the coil of described contactor through the normally closed contact KF-1 of described separating brake gauge tap;
The quiet knee-joint three-phase supply zero phase end N of the 4th contact QF-4 of described air switch; The swing arm of the 4th contact QF-4 of described air switch connects the zero line port of the coil of described contactor through the normally opened contact KH-1 of described shutting-brake control switch;
The normally opened contact KM-3 of described contactor is connected in parallel on the two ends of the normally opened contact KH-1 of described shutting-brake control switch;
Described pilot lamp H is connected between the swing arm of the swing arm of the 3rd contact QF-3 of described air switch and the 4th contact QF-4 of air switch;
The secondary output voltage terminal U of described transformer T connects acquisition module input end;
The secondary output voltage terminal U of described transformer T connects the respective input of described acquisition module;
The output terminal I of described Current Transmit connects the respective input of described acquisition module.
The base stage of described triode Q1 and triode Q2 connects the corresponding port of described single-chip microcomputer respectively; The emitter ground connection respectively of described triode Q1 and triode Q2;
The coil of described separating brake gauge tap is connected between the collector of VCC12V power supply and described triode Q1;
The coil of described shutting-brake control switch is connected on described between VCC12V power supply and the collector of described triode Q2.
The model of described analog switch is CD4067; The model of described filtration module is MAX262; The model of acquisition module is CS5550; The model of described single-chip microcomputer is TMS320; The model of described 485 interface modules is RSM485ST; The model of described memory module is IDT3834; The model of described triode Q1 and triode Q2 is respectively 9013.
The detection method of the present embodiment utilizes grounded screen hidden danger intelligent detection device to carry out the method detected, and comprises the steps:
(1) connection: multiple collecting unit is separately positioned on transformer station's zones of different, collecting unit and computing machine adopt 485 communications to transmit image data respectively; Collecting unit is utilized to connect the corresponding device of grounded screen downlead, be connected on the grounded screen downlead of neutral point of main transformer by the reference edge in two of signal source High-current output ends by power lead, the end that powers up in two High-current output ends of signal source is connected on transforming plant apparatus down conductor to be measured simultaneously; Record the corresponding down conductor positional information of harvester passage and power up end position information;
(2) electro-detection is added: in computing machine, control software design is installed; Described control software design exports steering order to the single-chip microcomputer of collecting unit, and single-chip microcomputer exports control signal to signal source, applies big current to grounded screen; Simultaneously described control software design transmitting time synch command is to collecting unit, and collecting unit receives real-time parallel collection after synch command and uploading data, and computing machine real-time reception also preserves the magnitude of voltage of each port of collecting unit;
(3) sequence detection: the mobile end that powers up is on next one transforming plant apparatus down conductor to be measured, and record powers up end position information; Perform the operation of step (2), detect all downleads successively;
(4) draw: utilize icon storehouse and basic drawing instrument to draw out transformer station's layout of detected plant stand; Described transformer station layout comprises the positional information of the interior layout information of transformer station, the operational outfit positional information of transformer station and ground wire downlead;
(5) definition and corresponding measurement point: the measurement data points defining grounded screen downlead in described transformer station layout, then receives on grounded screen measured point by each measurement data points by measurement port correspondence;
(6) numerical value of each port of pick-up unit obtained according to control terminal judges the operation conditions of grounded screen;
If the magnitude of voltage approximately equal between each check point that device obtains, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect is in good condition;
If between any two check points that device obtains or region there is obvious cliff of displacement formula pressure reduction in magnitude of voltage, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect exists hidden danger defect, and trouble spot be present in there is pressure reduction between two check points or region, the corrosion of pressure reduction larger explanation trouble spot is more serious simultaneously, when pressure reduction is close to 50V, illustrate rupture completely in trouble spot;
If all there is obvious pressure reduction between multiple check points that control terminal obtains, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect has many places hidden danger defect.
Signal source is the electric signal of 350A, 50V to the big current that grounded screen applies.Collecting unit is made up of multiple, and each collecting unit has 16 detection port, and collecting unit quantity can be expanded, and maximum 8 collecting units, are provided with 128 detection port, respectively 128 check points of corresponding grounded screen.
Control software design is after the output current of control signal source, and to harvester transmitting time synch command, harvester receives real-time parallel collection after synch command and uploading data, ensures the time consistency of overall data.
Connection: by multiple stage pick-up unit branch in transformer station's zones of different, adopts 485 to communicate with computing machine between harvester and transmits image data.Pick-up unit is utilized to connect the corresponding device of grounded screen downlead, be connected on the grounded screen downlead of neutral point of main transformer by the reference edge in two of outside source High-current output ends by power lead, the other end (powering up end) is connected on transforming plant apparatus down conductor to be measured simultaneously; Record the corresponding down conductor positional information of harvester passage and power up end position information.
(2) add electro-detection: computer software control signal source outputs signal, apply big current to grounded screen, simultaneous computer software real-time reception also preserves the magnitude of voltage of each port of harvester.Signal source in the present embodiment is the electric signal of 350A, 50V to the big current that grounded screen applies.
In the present embodiment, harvester is made up of multiple stage, and every platform has 16 detection port, and pick-up unit quantity can be expanded, and maximum 8 table apparatus are provided with 128 detection port, respectively 128 check points of corresponding grounded screen.And pick-up unit adopts the information acquisition chip of CS5550 model, described information acquisition unit passes through signal gating chip to the information of the information gathering point of at least two in grounded screen.
In addition, described harvester is also provided with storage unit and relay drive unit, the data message that described storage unit gathers for storing information acquisition unit, and the present embodiment adopts the data-carrier store of IDT3834 model, and itself and control terminal carry out information communication.Described relay drive unit drives relay by relay interface.
(3) sequence detection: the mobile end that powers up is on next one transforming plant apparatus down conductor to be measured, and record powers up end position information.Execution second step operates, and has detected all downleads successively;
(4) draw: namely the layout drawing transformer station on control terminal schemes A, figure A comprises the interior layout information of transformer station, the operational outfit positional information of transformer station, and the positional information of ground wire downlead.
Control terminal in the present embodiment selects the notebook computer often used in prior art, and staff only just need can learn the operation conditions of ground wire by notebook computer.When graphing, control terminal can utilize icon storehouse and basic drawing instrument (such as straight line tool, arc tool, the rectangle tool etc.) to draw out floor plan---Fig. 4 of detected plant stand.
(5) definition and corresponding measurement point: the measurement data points defining grounded screen downlead in the diagram, is then received each measurement data points on grounded screen measured point by measurement port correspondence.
(6) reach a conclusion: the numerical value of each port of pick-up unit obtained according to control terminal judges the operation conditions of grounded screen.In control terminal, the analysis software to the data analysis that pick-up unit detects is stored in the present embodiment, this analysis software is the mapping software that the signal that pick-up unit detects can be transformed into voltage distribution graph conventional in prior art, staff intuitively can obtain the operation conditions of grounded screen according to this distribution plan, reaches a conclusion.
The conclusion of described grounding network running situation is one of following situation:
(1) if magnitude of voltage approximately equal between each check point of obtaining of control terminal time, even Uj<0.05*I(is wherein, Uj is grounded screen check point voltage I signal source output current) then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect is in good condition;
(2) if obvious pressure reduction appears in the magnitude of voltage between end and reference edge that powers up that control terminal obtains, even Uj>0.2*I(is wherein, Uj is grounded screen check point voltage I signal source output current) then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect exists corrosion cracking fault;
(3) if obvious pressure reduction appears in magnitude of voltage between multiple check points of obtaining of control terminal, the i.e. region of Uj>0.05*I, then prove to there is multiple potential faults in current path between two grounded screen downleads that signal source two current output line connect, current path is the position reduced successively along voltage, and illustrate that when pressure reduction is larger the corrosion of trouble spot is more serious, the i.e. region of Uj>0.2*I, there is major defect in grounded screen, should repair immediately, when pressure reduction is close to 50V, illustrate rupture completely in trouble spot.
Such as, in Fig. 5 be the curve map utilizing the present embodiment to detect positive definite 110KV transformer station.Application the present embodiment when detecting when carrying out input signal detection to 610-7, measuring current path is neutral point of main transformer from 610-7 to 2#, detect data as Fig. 4, can find out according to test value, full station equipment can be divided into 5 plates by the magnitude of voltage according to each equipment downlead place, full station, wherein 610-7 and 10kV2# electric capacity is that 35kV battery limits, 110kV outgoing line side, 110kV main transformer side, main transformer region become independent equipotential region separately with 2# neutral point of main transformer for benchmark the highest two points.The voltage difference between each plate can be found out clearly by Fig. 5, can judge that current path not directly flows to 2# neutral point of main transformer according to the path of rationality from 610-7 thus, but along 610-7 equipment--the path in 35kV battery limits-110kV outgoing line side region-110kV main transformer side region-main transformer region is flowed back to, and difference is larger between 610-7 equipment and adjacent 590-7, although the equiva lent impedance at 610-7 place is 78.7m Ω, belong to according to DL/T4752006 directive/guide regulation and still can, but also should be paid attention to, 610-7 differs from 10 volts to 590-7, the voltage of about 1300V will be produced at two equipment rooms when substituting into by fault current 20kA.Continuity test instrument is all generally make reference with neutral point of main transformer to detect each point resistance when detecting, and to detect 610-7 and 590-7 to the test value of neutral point of main transformer be 27.4 and 16.3, all specifies in the scope of 50m Ω at directive/guide, so also can not draw attention.610-7 and 10kV2# reactance two equipment are in equipotential as seen from Figure 5, namely connect good between these two equipment.Detection data for grounded screen can draw inspection modification easily, only need be connected between 610-7 downlead with 590-7 downlead, just can remove a hidden danger.Again detect after being repaired by grounded screen, hidden danger eliminates, and in Fig. 5, the pressure reduction of each plate also eliminates.
The present embodiment in the specific implementation, can adopt and comprise data acquisition mechanism 1, signal source mechanism 2, and the device of control module realizes said method, and wherein data acquisition mechanism corresponds to the pick-up unit in step (two), and it is based on the control of control module; Signal source mechanism corresponds to the signal source in said method, and control module corresponds to the control terminal mentioned in said method.In use, the signals collecting end of data acquisition mechanism is located on the information gathering point of grounded screen device, for gathering effective node potential current information in grounded screen, its signal output part connection control unit.
And the concrete structure of described data acquisition mechanism 1 as shown in Figure 2: comprise main control unit, as control center, the present embodiment adopts the single-chip microcomputer of TMS320 model, described main control unit connects computer interface by 485 communication modules (adopting RSM485ST), and described computer interface is connected with control module 3 is wireless;
Information acquisition unit, for Real-time Collection grounded screen information gathering point place's voltage and current information, and is real-time transmitted to control module by the information detected by main control unit.The present embodiment adopts the information acquisition chip of CS5550 model, described information acquisition unit is by signal gating chip (the present embodiment adopts the signal gating chip of the CD4067 model) information to the information gathering point of at least two in grounded screen, and by MAX262 filtering chip, signal is processed, filtering clutter signal.
In addition, described data acquisition mechanism 1 is also provided with storage unit and relay drive unit, the data message that described storage unit gathers for storing information acquisition unit, the present embodiment adopts the data-carrier store of IDT3834 model, and it communicates with main control unit information.Described relay drive unit drives relay by relay interface, adopts the driving chip of 9013 models.
Described signal source mechanism 2 is also based on the control of control module, in use, the signal input part of described signal source mechanism 2 connects three-phase supply, the positive pole of signal output part connects the information gathering point of tested earthing device, negative pole connects in the main transformer neutral point of grounded screen, its structure is as shown in Figure 3: comprise transformer T, current transformer CT, and contactor, wherein, transformer T exports to detected grounded screen after being changed by outside two-phase power supply, the former limit of described transformer T is used for being connected with L2 phase line with the L1 phase line in three-phase supply, secondary exports information gathering point output voltage as voltage output end, described Current Transmit is used for the voltage after being changed by transformer T and exports to detected grounded screen information gathering point I in the form of electric current, described transformer T output terminal draws both end voltage to detected grounded screen information gathering point U, described Current Transmit is serially connected on the secondary outlet line of transformer, the output terminal of Current Transmit as current output terminal to information gathering point output current, whether described contactor is used for the energising of control transformer T, described contactor coil KM, contactor control section breaker KF and are serially connected between the L3 phase line of three-phase supply and zero line N, the make contact KM1 of contactor and air switch QF is serially connected on the connection line of the former limit of transformer T and three-phase supply L1, L2, controls closing switch KH be parallel with the relay normally open contact KM2 that lockout contactor continues energising at contactor.Signal source mechanism 2 also comprises the pilot lamp H being used to indicate signal source institution staff, and described pilot lamp H is connected in parallel on the two ends of contactor circuit.
The present embodiment configuration steps is simple, detects accurately, can carry out effectively accurate fault detect when grounded screen is normally run to grounded screen.
The above embodiment is only the preferred embodiments of the present invention, and and non-invention possible embodiments exhaustive.For persons skilled in the art, to any apparent change that it is made under the prerequisite not deviating from the principle of the invention and spirit, all should be contemplated as falling with within claims of the present invention.
Claims (5)
1. a grounded screen hidden danger intelligent detection device, is characterized in that: comprise collecting unit, computing machine and signal source; Described collecting unit comprises analog switch, filtration module, acquisition module, single-chip microcomputer, relay control module, memory module and 485 interface modules;
The input end of described analog switch is connected with earthing device downlead by wire; The output terminal of described analog switch connects the corresponding port of described acquisition module through described filtration module; The corresponding port of single-chip microcomputer described in the output termination of described acquisition module;
Described memory module is connected with the corresponding port of described single-chip microcomputer;
The corresponding control output end of single-chip microcomputer described in the control inputs termination of described relay control module;
The control output end of described relay control module connects the control input end of described signal source; The respective input of acquisition module described in the output termination of described signal source;
Described computing machine is connected with the corresponding port of single-chip microcomputer by 485 interface modules.
2. a kind of grounded screen hidden danger intelligent detection device according to claim 1, is characterized in that: described signal source comprises air switch, contactor, shutting-brake control switch, separating brake gauge tap, transformer T, Current Transmit and pilot lamp H;
The quiet knee-joint three-phase supply A phase of the first contact QF-1 of described air switch holds L1; The swing arm of the first contact QF-1 of described air switch connects the one end on the described former limit of transformer T through the first main contacts KM-1 of described contactor;
The quiet knee-joint three-phase supply B phase of the second contact QF-2 of described air switch holds L2; The swing arm of the second contact QF-2 of described air switch connects the other end on the described former limit of transformer T through the second main contacts KM-2 of described contactor;
The quiet knee-joint three-phase supply C phase of the 3rd contact QF-3 of described air switch holds L3; The swing arm of the 3rd contact QF-3 of described air switch connects the FireWire port port of the coil of described contactor through the normally closed contact KF-1 of described separating brake gauge tap;
The quiet knee-joint three-phase supply zero phase end N of the 4th contact QF-4 of described air switch; The swing arm of the 4th contact QF-4 of described air switch connects the zero line port of the coil of described contactor through the normally opened contact KH-1 of described shutting-brake control switch;
The normally opened contact KM-3 of described contactor is connected in parallel on the two ends of the normally opened contact KH-1 of described shutting-brake control switch;
Described pilot lamp H is connected between the swing arm of the swing arm of the 3rd contact QF-3 of described air switch and the 4th contact QF-4 of air switch;
The secondary output voltage terminal U of described transformer T connects the respective input of described acquisition module;
The input coil of described Current Transmit is socketed on the secondary outlet line of described transformer T; The output terminal I of described Current Transmit connects the respective input of described acquisition module.
3. a kind of grounded screen hidden danger intelligent detection device according to claim 2, is characterized in that: described relay control module comprises triode Q1 and triode Q2;
The base stage of described triode Q1 and triode Q2 connects the corresponding port of described single-chip microcomputer respectively; The emitter ground connection respectively of described triode Q1 and triode Q2;
The coil KF of described separating brake gauge tap is connected between the collector of VCC12V power supply and described triode Q1;
The coil KH of described shutting-brake control switch is connected on described between VCC12V power supply and the collector of described triode Q2.
4. a kind of grounded screen hidden danger intelligent detection device according to claim 3, is characterized in that: the model of described analog switch is CD4067; The model of described filtration module is MAX262; The model of acquisition module is CS5550; The model of described single-chip microcomputer is TMS320; The model of described 485 interface modules is RSM485ST; The model of described memory module is IDT3834; The model of described triode Q1 and triode Q2 is respectively 9013.
5. utilize a kind of grounded screen hidden danger intelligent detection device described in claim 1 to carry out the method detected, it is characterized in that comprising the steps:
(1) connection: multiple collecting unit is separately positioned on transformer station's zones of different, collecting unit and computing machine adopt 485 communications to transmit image data respectively; Collecting unit is utilized to connect the corresponding device of grounded screen downlead, be connected on the grounded screen downlead of neutral point of main transformer by the reference edge in two of signal source High-current output ends by power lead, the end that powers up in two High-current output ends of signal source is connected on transforming plant apparatus down conductor to be measured simultaneously; Record the corresponding down conductor positional information of harvester passage and power up end position information;
(2) electro-detection is added: in computing machine, control software design is installed; Described control software design exports steering order to the single-chip microcomputer of collecting unit, and single-chip microcomputer exports control signal to signal source, applies big current to grounded screen; Simultaneously described control software design transmitting time synch command is to collecting unit, and collecting unit receives real-time parallel collection after synch command and uploading data, and computing machine real-time reception also preserves the magnitude of voltage of each port of collecting unit;
(3) sequence detection: the mobile end that powers up is on next one transforming plant apparatus down conductor to be measured, and record powers up end position information; Perform the operation of step (2), detect all downleads successively;
(4) draw: utilize icon storehouse and basic drawing instrument to draw out transformer station's layout of detected plant stand; Described transformer station layout comprises the positional information of the interior layout information of transformer station, the operational outfit positional information of transformer station and ground wire downlead;
(5) definition and corresponding measurement point: the measurement data points defining grounded screen downlead in described transformer station layout, then receives on grounded screen measured point by each measurement data points by measurement port correspondence;
(6) numerical value of each port of pick-up unit obtained according to control terminal judges the operation conditions of grounded screen;
If the magnitude of voltage approximately equal between each check point that device obtains, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect is in good condition;
If between any two check points that device obtains or region there is obvious cliff of displacement formula pressure reduction in magnitude of voltage, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect exists hidden danger defect, and trouble spot be present in there is pressure reduction between two check points or region, the corrosion of pressure reduction larger explanation trouble spot is more serious simultaneously, when pressure reduction is close to 50V, illustrate rupture completely in trouble spot;
If all there is obvious pressure reduction between multiple check points that control terminal obtains, then prove that the grounded screen between two grounded screen downleads that signal source two current output line connect has many places hidden danger defect.
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