CN1866038A - Large-scale grounding network detection technology and detection system for power plant and transformer substation - Google Patents
Large-scale grounding network detection technology and detection system for power plant and transformer substation Download PDFInfo
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- CN1866038A CN1866038A CN 200510012656 CN200510012656A CN1866038A CN 1866038 A CN1866038 A CN 1866038A CN 200510012656 CN200510012656 CN 200510012656 CN 200510012656 A CN200510012656 A CN 200510012656A CN 1866038 A CN1866038 A CN 1866038A
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Abstract
The related testing scheme for large-scale ground network of power plant and transformer substation comprises: (1) preparing; (2) without external voltage or current, measuring the normal network; (3) with voltage and current, measuring and obtaining data; (4) using computer to obtain the ground potential distribution graph, analyzing data to obtain the network report; (5) taking validation. This invention is fast and accurate.
Description
Technical field
The present invention relates to technology and detection system thereof that the problem that generating plant, transformer station large-scale grounding network exists is detected.
Background technology
The grounded screen of generating plant, transformer station is working earthing, protective ground, lightning protected ground connection, the antistatic protection ground connection of current collection power system's high-low-voltage electrical equipment and relay protection aut.eq., and four big functions are in the grid of one.It is one of important electrical equipment that guarantees safe operation of power system.Grounded screen plays crucial effects for the safe operation of electric system.
At present; because the ground connection of the grounded screen of domestic generating plant, transformer station, ground lead, electrical equipment existing problems itself; and the initiation high voltage; big electric current is scurried into low-pressure system, burns house-service equipment, the breakdown protection secondary cable; burn the relay protection components and parts; cause the protective relaying device malfunction, electrical equipment is burnt in tripping.Cause system sectionalizing, large area blackout for this reason.For national economy brings about great losses, even cause social influence.As far back as 1987, in the high voltage operation meeting of the whole nation, No. 9 literary composition of water power new word (annex 1) just proposed the importance of grounded screen in electric system, points out in making a Summary, by Hubei, four the grounded screen accidents in Guangxi, everybody recognizes the raising along with electric pressure, the increase of short-circuit current, and grounded screen is important further to the personal safety influence, in case have an accident, what may bring is exactly catastrophic consequence, and the problem of grounded screen has ubiquity in the whole nation at present, must draw attention.Ministry of Energy in 1989, the summary dispatch of national electric system high voltage professional work net 1st Coordination Commission meeting, electric skill (71) number literary composition, annex particularly point out the problem of grounded screen.The problem that various places are found in factory, the grounded screen of standing excavation further specifies the measure of in the national high voltage professional work meeting in 1987 the grounded screen problem being taked and is very important.Present problem is: 1. some areas also enough are not paid attention to grounded screen inspection and retrofit work, over advancing year the accident appearance that causes generating plant, transformer station's full cut-off because of grounded screen is bad are arranged again.2. relevant technical matters for example; Corrosion and soil property relation, the definite etc. of the selection of heat-stable time and sectional area does to sum up or the tackling key problem of row topic, so that revise ground connection rules and design, construction, transformation and the operation of job specifications to instruct grounded screen early.
The detection technique of present electric system grounded screen, adopt industry standard DL/475-1992 of State Grid " the measurement guide rule of earthing device power frequency characteristic " and the power industry standard DL/T621-1997 of the People's Republic of China (PRC) " ground connection of alternating-current electric device " rules (hereinafter to be referred as " ground connection rules "), the numerical value that tests out is: test point is to whole generating factory, the resistance of grounding net of transformer substation and soil electricity, then in factory, in standing, use multimeter, electric bridge, instruments such as ground connection megger are taken a sample test the earth point of high-tension apparatus, measure conducting and grounded screen electric resistance value, the data that this method of testing draws all are difficult to accurately, reflect grounded screen fast, ground lead, the defect condition of earthing device.Adopt this method, tester's workload is big, and the surveying work time is long, and it is many to carry out the test job difficulty.For the big and soil resistivity in generating plant, transformer station's area when inhomogeneous, in order to obtain more believable test result, " ground connection rules " require the electric current utmost point is increased to 10 kilometers from the distance of tested earthing device, and voltage pole is from the also corresponding increase of distance of tested earthing device simultaneously.The difficulty of test job is well imagined.
Though work through a large amount of heavy complexity, the numerical value of measuring, can only obtain a comprehensive resistance value by string and series-parallel connection between the electric resistance of soil of test point and the grounded screen, facts have proved that its resistance value can not prove fully can whether grounded screen be qualified, satisfy the requirement of power system operation mode.Utilize existing pick-up unit and technology,, can't determine whether it meets present Operation of Electric Systems parameter request owing to be subjected to the influence of soil resistivity.To the resistance value of grounded screen bus, the net sectional area, the ducting capacity of failed shorted electric current, the thermal stability of grounded screen conductor of resistance value, grounded screen bus and ground lead between the grounded screen bus, existing testing tool and method all can not test and calculate to the protective ground line of factory, the internal interface of standing earth mat, the break-make situation of ground lead, every high-tension apparatus.Whether the integral ground net meets the generating plant, and the requirement of transformer station's capacity of short circuit also just can't be known.Require in " ground connection rules ", the touch voltage of high-tension apparatus, the generating plant, the zone of ground generation step voltage can not test out in the transformer station.
The technical management of grounded screen at present: electric system fast development closely during the last ten years.Old generating plant, old transformer station have mostly carried out boosting, increase-volume, and the high-tension line transmission of electric energy is multiplied.Electric system has at present all been carried out the insulation accent to high-voltage circuit and has been climbed or changed composite insulator for preventing the circuit pollution flashover, has strengthened the protection of ultra-high-tension power transmission line anti overvoltage.And the high-tension apparatus in the transformer station does not improve the ability and the method for anti overvoltage; when various forms of superpotential appears in system; high-tension apparatus in the transformer station has just become the superpotential position of release; if pollution flashover or equipment breakdown occur on the high-tension apparatus of imperfect earth in the transformer station; the secondary connection terminal box of high-tension apparatus is between the main grounded screen at that time; between each terminal box; terminal box is between the protective disc; cable shield is between the cable core; by the secondary cable shielding line two ends that these equipment connect, will produce the high voltage of several kilovolts even tens kilovolts.The safety of serious threat personnel and equipment.For this reason, to the generating plant, the grounding net of transformer substation quality will propose more strict requirement.
Because grounded screen and earthing device belong to concealed work.Also there is not at present advanced checkout equipment.Stipulate in national for this reason up-to-date " pilot project of earthing device, cycle and requirement " standard, for move more than 10 years (comprise rerun after transforming reach this time limit) send out factory, inspection all will be excavated by transformer station.Along with power system development, the single-line to ground fault electric current sharply rises, and the situation of single-line to ground fault electric current greater than the three-phase shortcircuit electric current occurred.Blowing earthing device repeatedly to occur, all caused great equipment burnout accident in the system owing to short trouble for this reason.The North China Power Group just requires to dock earth mat and excavates inspection to change 5 years into 10 years.
In recent years because accidents caused the increasing of grounded screen, the anti-accident of State Grid Corporation of China is struggled against 25 emphasis measures, article 12,, require: strengthen maintenance grounded screen, must test, excavate inspection to grounded screen by the cycle, to in time transform grounded screen defective or that corrosion is serious, stop to take place the accident that causes owing to the grounded screen reason.Present generating plant in all parts of the country, transformer station all begin to excavate inspection, but because the geographic position of the design drawing of grounded screen and practice of construction installation differs greatly, the high-low pressure equipment and the framework thereof of factory is arranged again, standing more than the interior ground stand in great numbers.Various passages in factory, the station equipment district, factory building, the switch gear room, building such as pulpit is numerous.The various pipeline grooves of below ground, the high-low pressure cable laying is intricate.Grounded screen and ground lead are countless at the vulnerable area of underground pad.This all gives and excavates the defective of checking grounded screen, brings very big difficulty.Excavation inspection will be expended a large amount of artificial and material resources simultaneously, also can be described as and has no way of searching at all.Grounded screen is through underground corrosion for many years, and generating plant, transformer station are through too much enlarging, increase-volume, the transformation of phase.Make the grounded screen of each phase engineering, the situation that is welded to connect all be difficult to find.If grounded screen is all excavated inspection, will make factory, all high-low pressure equipment of standing lose ground protection, influence normal working earthing.This can be to the normal operation of electric system, and the electrical equipment and the personal safety of generating plant, transformer station caused bigger danger.
There are many defectives in current measuring methods: 1. grounded screen, ground strap, high-tension apparatus ground lead, seriously corroded even its sectional area only is left 1 square millimeter, even has become rusty, because also have the existence of iron oxide, existing measurement mechanism can not test out.The capacity of short circuit requirement under the present system operation mode can be met, also just right judgement can not be made.2. broken string appears in ground strap, high-tension apparatus down conductor for a certain reason, and in the time of can not the conducting failure electric current, existing apparatus also be difficult to test-based examination and comes out.3. when electric system generation unsymmetrical short-circuit,, on grounded screen, will produce very high potential difference (PD) if grounded screen does not meet thermally-stabilised requirement.It is to the interference of protective relaying device in standing with to the threat of secondary cable insulation, just can not predict out to the harm of straight-flow system, the using electricity system of stand generation.Thereby can't make the practicable precautionary measures.4. when unsymmetrical short-circuit or station inner high voltage equipment generation earth fault appear in electric system, owing to do not know the net sectional area of ground connection netting twine, the ducting capacity of the failed shorted electric current on grounded screen and the earthing device, the thermally-stabilised situation of grounded screen also just can not test and calculate.5. when the unsymmetrical short-circuit fault appears in electric system, the touch voltage that produces on the electrical equipment in standing, the internal field of standing produces the distribution situation of step voltage on the ground and can not accurately test, calculate.6. the grounded screen of same factory, stand later stage enlarging, reconstruction project is not connected with the grounded screen of preliminary engineering.But because the bonding of protection secondary cable, one terminates in the terminal box of new equipment, and the other end is connected on the ground strap of master-control room protective device in early stage, makes and can't measure the major defect that grounded screen exists.
Summary of the invention
Purpose of the present invention provides a kind of grounded screen detection technique and detection system can solve the above problem that exists at present in the grounded screen system with regard to being.The problem detection of can be fast, accurately and efficiently grounded screen being existed is come out, and the technical products structure is portable, simple to operate, the grounding net defect intuitive display, and pair defective authentication function is accurately arranged.
Technical scheme of the present invention is: at first its know-why of the present invention is: the poor ability of the earth conduction current.In the certain condition unit distance, its resistance, voltage drop, the ability of conduction current is identical.Grounded screen conduction current very capable.On defective grounded screen, the resistance on the equal pressure zone of grounded screen between each extension line, voltage drop, the ability of conduction current is inequality.
According to this principle, invented detection technique to generating plant, the every data of grounding net of transformer substation.Its technical scheme steps is as follows:
(1) preliminary work: (1), the floor plan in the generating plant that will measure grounded screen, substation equipment district and the 3 dimensional drawing of high framework, utilize digital device to be transferred to computing machine, or draw out this factory fast in proportion, stand, the floor plan of battery limits and the 3 dimensional drawing of high framework with special-purpose drawing software on computers; (2), at first connect line between each pick-up unit and the line between pick-up unit and the computing machine, press the order of unit and equipment then respectively, on lead-in wire under the ground connection of the high-tension apparatus of required measurement, the high-voltage switch gear chamber, on the ground strap of equipment such as main control room and generator, joint detection line on the ground wire of the neutral point of main-transformer, the current transformer of detection line is connected on the disconnecting link drive link of high architecture arrangement with the equipment ground lead-in wire that is connected with high framework ground connection on, near and the big ground the high-tension apparatus district, well-regulatedly plug several drill rods, the degree of depth is at 0.6～0.8 meter, and connect the earth voltage measurement line, the reference point of comparing with the grounded screen current potential as ground potential; Whether (3), check the position that marks on battery limits floor plan that actual grounded screen measurement point position and computing machine panel show and the 3 dimensional drawing corresponding.
(2) grounded screen is not being applied under the situation of any impressed voltage, current signal, generating plant, grounding net of transformer substation during to normal operation are directly measured.Measure: (1), because electric system three-phase load imbalance, produce zero-sequence current, at the potential value of each point reflection of grounded screen, big potential value on (2), the equipment place; And can tentatively judge by showing potential diagram on computers: the grounded screen position that (1) is corroded easily, (2) can reflect the high-tension apparatus that loses ground connection intuitively and accurately, and as the reference of next step detection.When detecting in this step, can draw, cause the unbalanced numerical value of grounded screen earth potential because electric system three-phase load imbalance produces zero-sequence current.This shows that zero-sequence current moves towards for a long time on grounded screen.Judge zero-sequence current produces the galvanic corrosion influence on grounded screen accurate position thus.Because the long-term ground connection of neutral point in big electric current solidly grounded system, so the underground corrosion speed that flows through the ground connection netting twine of current segment is for a long time wanted the earth mat corrosion speed faster than other parts far away.This just can provide reference for grounded screen inspection, overhaul, design, construction.
(3) in the generating plant, the main-transformer neutral point of grounding net of transformer substation is on main-transformer equipment ground line far away relatively or on the earth point of aerial earth wire in transformer station of ultra-high-tension power transmission line, utilize the isolating transformer on the pick-up unit to apply voltage to grounded screen, current signal, and carry out the grounded screen signals collecting by pick-up unit, and the input computing machine, the record data presented has: the no-load voltage of (1) measurement mechanism output, the terminal voltage of pick-up unit output when (2) giving the grounded screen input current signal, (3) give the magnitude of voltage of grounded screen input current signal point, (4) current value of importing to grounded screen, (5) current value on the ground wire of high-tension apparatus shell or operating mechanism and the high framework ground connection series connection ground wire, (6) the grounded screen potential value of measuring on every high-tension apparatus ground lead, (7) every data such as reference point of each check point of the earth and grounded screen current potential.
(4) above every measurement data is all shown on the corresponding point of 3 dimensional drawing of the pre-on computers high framework of floor plan or transformer station of input before, obtain the earth potential distribution plan of grounding net of transformer substation, and by data analysis and judge the report can draw the grounded screen situation;
If it is normal such as grounded screen, the potential difference (PD) of adjacent high-tension apparatus grounded screen is very little on each ground connection mesh or every the equal pressure zone, resistance between them is also very little, if high-tension apparatus down conductor and main grounded screen disconnect or down conductor serious corrosion takes place causes resistance to increase, this will increase with on every side potential difference (PD) so.Compare with the current potential of adjacent the earth at current potential by the high-tension apparatus earth point.If the current potential of certain high-tension apparatus and ground potential are close, and obvious gap is arranged, can assert that then this equipment and main grounded screen electric resistance are bigger with adjacent high-tension apparatus earth point.Potential diagram by grounded screen is analyzed comparison, just can judge intuitively, the neither one factory station a plurality of grounded screen phenomenons of appearance is arranged or lose the situation of ground connection owing to the grounded screen corrosion causes high-tension apparatus.
(5) checking: (1) is on grounded screen earth potential figure, think that high-tension apparatus or that unit ground connection have problem, just the negative pole of the electric current output line of earth connection measurement plant, be connected on and assert on the problematic equipment of ground connection, the starting measurement mechanism is checked the variation of earth potential figure, and at this moment the earth potential of ground connection equipment problems will obviously raise, simultaneously being connected normal equipment ground point current potential with grounded screen will obviously reduce, and the electric current of measurement mechanism output at this moment will be reduced to very little.At this moment the ground connection that just can confirm this equipment is very serious with main grounded screen disconnection or corrosion; (2) assert that certain equipment loses ground connection, can check earthy variation connecting a short-circuit line on the ground wire of this equipment with on the intact point of grounded screen, current potential is balanced, and electric current is raised to normal value, proves that this section ground wire defect situation is true.
When calculating, the standard material that an also available pick-up unit generally uses grounding grid design is measured in the measurement of described grounded screen and earthing device corrosion loss sectional area in the present invention, obtains the table of comparisons of the sectional area of the standard material that grounding grid design generally uses.Or directly check the table of comparisons of GB unified standard.
Can make a concrete analysis of out the report of following grounded screen situation through above-mentioned steps: 1. the ground wire between every high-tension apparatus down conductor, main control room, high-tension apparatus is to net sectional area and equivalent resistance accurately between the grounded screen bus.2. the ground wire of every high-tension apparatus, high-tension apparatus ground wire and the accurate position that increases of the accurate place that disconnects of grounded screen or resistance each other.3. measure the accurate and effective sectional area of the grounded screens such as grounded screen, main control room, high-voltage switch gear chamber in each electric pressure high-tension apparatus district, the ability of grounded screen conduction fault current to main transformer neutral ground line.4. the resistance value and the conduct electricity flow of the same model standard material that uses with reference to this grounded screen just can be judged the corrosion situation of grounded screen.Calculate operating grounded screen net sectional area and equivalent resistance.5. according to the present capacity of short circuit in this generating plant, transformer station with flow through short-circuit current stationary value, the equivalent duration of short-circuit current and the thermal stability factor of ground wire material of grounded screen.Utilize the net sectional area and the equivalent resistance of the existing grounded screen that meter calculates, the maximum water conservancy diversion amount at each position of grounded screen just can calculate the actual heat stable value that this factory, the grounded screen of standing are in operation.Whether this grounded screen of decidable needs to improve or overhaul thus.6. can measure, calculate, draw dispatch from the factory, stand in every high-tension apparatus when earth fault occurring or system when asymmetric ground short circuit fault occurring, the potential image on full factory, the grounded screen of standing.Ground potential figure on factory's station each measurement point of the earth.7. situation about distributing according to the grounded screen earth potential.Can effectively analyze, when unsymmetrical short-circuit or station inner high voltage equipment generation earth fault appear in system, the interference of relay protection, aut.eq..The extent of injury to low-pressure system, straight-flow system and secondary cable.8. can effectively analyze owing to epd, to influence and the destruction that prevents the superpotential system.9. the base area potential image can be found out the zone that produces step voltage exactly, calculates when the system failure, produces the amplitude of step voltage.10. show on the 3 dimensional drawing according to the high-tension apparatus framework that current distributing figure and earth potential distribution plan just can be found accurately and can produce the superpotential equipment of contact, and calculate the amplitude that produces touch voltage.11. can effectively analyze owing to epd, to the influence and the destruction of lightning protection and superpotential system.12. the grounding net defect of COMPUTER DETECTION grounded screen device to finding has authentication function accurately, utilizes this device need not excavate inspection grounded screen, just can verify that the defective of grounded screen is correctly true.13. detect all data informations in the grounded screen process, all follow according to the automatic spanned file of measuring of time sequencing, but long preservation goes out report and files but be furnished with the printer field print in computing machine or the mint-mark CD.
The detection system that is applied in generating plant of the present invention, the transformer station's large-scale grounding network detection technique is characterized in that this system comprises interconnective earthing test source apparatus, detection signal acquisition process and control device; The earthing test source apparatus is made of the power supply automaton and the isolating transformer that are assembled together; Detection signal acquisition process and control device comprise interconnective detection signal acquisition processing device and computing machine; The detection signal acquisition processing device comprises host module, outlet module, sampling module, communication module and power module, and host module comprises: central processing unit, real-time clock, power down keep data-carrier store, data communication module; Sampling module is the A/D digital to analog converter; Outlet module comprises controlling output circuit and remote signalling sample circuit, and data communication module comprises two kinds of interfaces of RS232, RS485 and interface treatment circuit; The earthing test source apparatus, the input end of A/D digital to analog converter in two output terminals difference joint detection signal acquisition and processing apparatus of device, the output of A/D digital to analog converter insert central processing unit with input end, central processing unit is connected with computing machine by interface in the communication module, another output terminal of earthing test source apparatus connects with detection signal acquisition processing device central processing unit by the remote signalling sample circuit, the logical connection with controlling output circuit of central processing unit outputs a control signal to the earthing test source apparatus, two output terminals in addition of earthing test source apparatus are connected on respectively on the grounded screen, and the A/D digital to analog converter is connected with grounded screen to be measured by voltage transmitter.
The frame mode of each module for pegging graft in the native system signal pickup assembly.It is core devices that central processing unit adopts advanced 80C196KC chip; Adopt 12887 to be clock chip, adopt the non-volatile random data storer of HK1235 model; Programmable logic chip GAL16V8 is a controlling output circuit, and data communication module adopts MAX202, MAX1480 chip to finish interface communication.Software adopts modular design on this detection system computing machine simultaneously, and algorithm adopts the fast Flourier compute mode.
Beneficial effect of the present invention is: utilize the technology of the present invention and the test macro can be quick, the situation that tests out following grounded screen exactly can be utilized this device and patent detection technique, can clearly illustrate the defective of large-scale grounding network and earthing device and various measurement data on generating plant, the corresponding floor plan of transformer station on the computer screen, make detailed technical Analysis archives to grounded screen, for the design of grounded screen overhauling reform provides reliable foundation, and can provide important analysis foundation for factory, the crash analysis of standing, make anti-accident measures.Solve present grounded screen measuring technology and fallen behind, can not promptly and accurately test out the problem of the defective in the grounded screen.Changed and carried out the grounded screen test at present every year, but every year again because of the accidents caused present situation of grounded screen existing problems.And grounded screen pick-up unit system, it is fast then to have a measuring speed, and data are accurately comprehensive, just can obtain the advantage of the drawing data and the important in detail data analysis report of grounded screen quality at once.
Description of drawings
Fig. 1 detects wiring schematic diagram for grounded screen
Fig. 2 is a grounded screen detection system structural representation
Fig. 3 is the embodiment of the invention 1, grounded screen is not being applied the earth potential figure that draws under the situation of any impressed voltage, current signal
Fig. 4 in the embodiment of the invention 2 to grounded screen apply draw under the situation of impressed voltage, current signal earth potential figure
Fig. 5 is for applying the earth potential figure at an other position that draws under the situation of impressed voltage, current signal to grounded screen in the embodiment of the invention 2
Fig. 6 is the 3 dimensional drawing of high framework described in the present invention
Fig. 7 utilizes digital device to be transferred to the floor plan of the battery limits on the computing machine for described in the present invention
Embodiment
Embodiment 1: in certain transformer station, grounded screen is not applied electric current, voltage in the actual measurement grounded screen and record earth potential figure as shown in Figure 3.But to go out two high-tension apparatuses in the upper right corner should be that problem has taken place ground connection in intuitive judgment from this earth potential figure, belongs to the equipment that fault to ground is arranged.
Embodiment 2: in certain transformer station, at first detect in the actual measurement grounded screen according to this detection technique step, judge that wherein several equipment have problem, obtain earth potential figure after the empirical tests as Fig. 4, and oppose than test, measure: the output of isolating transformer no-load voltage 75v preset electric current is measured 18 millimeters of diameters respectively at large, medium and small three gears, 254 square millimeters of sectional areas, the current value and the magnitude of voltage that pass through on long 50 meters the round steel.Big gear, it is 0.206 ohm that electric current 231A voltage 47.6V calculates resistance value.Middle gear, it is 0.205 ohm that electric current 180A voltage 37.6V calculates resistance value.Little gear, it is 0.208 ohm that electric current 81.5A, voltage 17V calculate resistance value. at first it intuitively can judge 112 high-voltage switch gears by earth potential figure, and five or six equipment of 111-2.111-CT 112-2.112-CT.112-6 lose problem with grounding.Judge the grounded screen sectional area, this station high-tension apparatus down conductor is the round steel of 18 millimeters of diameters equally, at the main-transformer neutral point to the 110Kv.112 high-voltage switch gear, 111-2.111-CT the electric current that six its earth points of equipment of 112-2.112-CT.112-6 record is 23.8A, voltage is that 2 distances of 73.5V measurement are 50 meters equally, calculating this section grounded screen substitutional resistance is 3.09 ohm, deducting the electric resistance of soil value of measuring, the substitutional resistance of this section grounded screen is greater than 3.5 ohm, can judge thus, more than the equivalent cross-sectional area of several equipment ground downleads, the round steel sectional area that diameter group is 18 millimeters is little more than 18 times.Prove the very serious or failure welding of earthing device corrosion of these 6 equipment, under the state of lost territory, move.
Test the earth potential figure that draws as accompanying drawing 5 for detected another problematic position empirical tests among the embodiment 2.When it was measured, device electric current output cathode was connected on the main transformer neutral point No. 1, and negative pole is connected on the ground wire of 112 circuit coupling condensers, proving installation output current 125A, voltage 58V.Measuring No. 1 main transformer neutral point of discovery and this main transformer earthing of casing point has the voltage difference of 9.5V, on the disconnecting link drive link northernmost of 35kv battery limits the 58A electric current is arranged.Can judge through measurement data; (1) No. 1 main transformer earthing of casing and grounded screen disconnect.When unsymmetrical short-circuit appears in system, can cause the transformer case current potential to raise, all can cause serious threat to main transformer and personal safety.(2) the serious loose contact in ground strap junction of underground ground strap in 35kv battery limits and 110kv battery limits, the electric current on the disconnecting link drive link are that the iron crossbeam of the high framework of process 35kv passes to 110kv grounded screen.When unsymmetrical short-circuit appears in system; then may produce bigger epd at the grounded screen gap; at this moment pass this regional umbilical cable and a side the earth and be idiostatic cable sheath and relative opposite side and just may produce the potential difference (PD) of several kilovolts or tens kilovolts; be enough to puncture cable insulation, burn protective device.(3) having on the disconnecting link drive link of electric current, then may cause personal electric shock casualty accident if there is the people to operate at this.(4) the corrosion situation of this station grounded screen is serious, and grounded screen water conservancy diversion amount descends more than 50%.Grounded screen electric resistance increases, the thermally-stabilised requirement that can not satisfy this station capacity of short circuit of grounded screen.
Claims (5)
1, generating plant, transformer station's large-scale grounding network detection technique is characterized in that technical scheme steps is as follows:
(1) preliminary work: (1), the floor plan in the generating plant that will measure grounded screen, substation equipment district and the 3 dimensional drawing of high framework, utilize digital device to be transferred to computing machine or the special-purpose drawing software of utilization, draw out this factory on computers fast in proportion, stand, the floor plan of battery limits and the 3 dimensional drawing of high framework; (2), at first connect line between each pick-up unit and the line between pick-up unit and the computing machine, put in order by unit, battery limits and equipment respectively then, on lead-in wire under the ground connection of the high-tension apparatus of required measurement, the high-voltage switch gear chamber, on the ground strap of equipment such as main control room and generator, on the ground wire of the neutral point of main-transformer, connect the current potential detection line, the current transformer of detection line, be connected on the disconnecting link drive link of high architecture arrangement with the equipment ground lead-in wire that is connected with high framework ground connection on, near and the big ground the high-tension apparatus district, well-regulatedly plug several drill rods, the degree of depth is at 0.6～0.8 meter, and connect the earth voltage measurement line, the reference point of comparing with the grounded screen current potential as ground potential; Whether (3), check the position that marks on battery limits floor plan that actual grounded screen measurement point position and computing machine panel show and the 3 dimensional drawing corresponding;
(2) grounded screen is not being applied under the situation of any impressed voltage, current signal, generating plant, grounding net of transformer substation during to normal operation are directly measured, measure following data: the potential value that (1), each node of grounded screen reflect, (2), the current value on the high-tension apparatus earthing of casing line that is connected with high framework, big potential value on (3), the equipment place; With above data presentation with computing machine on floor plan or the corresponding point of high framework 3 dimensional drawing on, draw accurate grounded screen earth potential distribution plan, and can tentatively judge: the grounded screen position that (1) is corroded easily by showing potential diagram on computers, (2) can reflect the high-tension apparatus that loses ground connection intuitively and accurately, and as the reference of next step detection;
(3) in the generating plant, the main-transformer neutral point of grounding net of transformer substation, on the relative equipment ground line far away with the distance main-transformer or on the earth point of aerial earth wire in transformer station of ultra-high-tension power transmission line, utilize COMPUTER DETECTION device control isolating transformer to apply voltage, current signal to grounded screen.Utilize pick-up unit to carry out data acquisition, measure: the magnitude of voltage that grounded screen input current signal earth point is given in the terminal voltage of the no-load voltage of (1) measurement mechanism output, pick-up unit output when (2) give the grounded screen input current signal, (3), (4) are to every data such as reference point of the grounded screen potential value, each check point of (7) the earth and the grounded screen current potential that reflect on the ground wire of current value, (5) high-tension apparatus shell or the operating mechanism of grounded screen input and every the high-tension apparatus ground lead in current value, (6) on the high framework ground connection series connection ground wire;
(4) above every measurement data is all shown on the corresponding measurement point of the high framework 3 dimensional drawing of floor plan or transformer station of pre-previous input on computers, obtain the earth potential distribution plan of grounding net of transformer substation.And by data analysis and judge the report to draw the grounded screen situation;
(5) checking: (1) is on grounded screen earth potential figure, think that high-tension apparatus or that unit ground connection have problem, just the negative pole of the electric current output line of earth connection measurement plant, be connected on and assert on the problematic equipment of ground connection, the starting measurement mechanism is checked the variation of earth potential figure, and at this moment the earth potential of ground connection equipment problems will obviously raise, simultaneously being connected normal equipment ground point current potential with grounded screen will obviously reduce, and the electric current of measurement mechanism output at this moment will be reduced to very little.At this moment the ground connection that just can confirm this equipment is very serious with main grounded screen disconnection or corrosion; (2) assert that certain equipment loses ground connection, can check earthy variation connecting a short-circuit line on the ground wire of this equipment with on the intact point of grounded screen, balanced, prove that this section grounding net defect situation is true.
2, generating plant according to claim 1, transformer station's large-scale grounding network detection technique, it is characterized in that: when the measurement of carrying out grounded screen and earthing device corrosion loss sectional area and calculating, the standard material that available pick-up unit butt joint grounding grid design is generally used contrasts experiment with measuring, obtain sectional area, the resistance value of the standard material that grounded screen design generally uses, the table of comparisons of conduct electricity flow, or directly check the table of comparisons of GB unified standard.
3, the detection system that is applied in generating plant according to claim 1, the transformer station's large-scale grounding network detection technique is characterized in that this system comprises that interconnective earthing test installs detection signal acquisition process and control device in a steady stream; The earthing test source apparatus is made of the power supply automaton and the isolating transformer that are assembled together; Detection signal acquisition process and control device comprise interconnective detection signal acquisition processing device and computing machine; The detection signal acquisition processing device comprises host module, outlet module, sampling module, communication module and power module, and host module comprises: central processing unit, real-time clock, power down keep data-carrier store, data communication module; Sampling module is the A/D digital to analog converter; Outlet module comprises controlling output circuit and remote signalling sample circuit, and communication module comprises two kinds of interfaces of RS232, RS485 and interface treatment circuit; The earthing test source apparatus, the input end of A/D digital to analog converter in two output terminals difference joint detection signal acquisition and processing apparatus of device, the output of A/D digital to analog converter insert central processing unit with input end, central processing unit is connected with computing machine by interface in the communication module, another output terminal of earthing test source apparatus connects with detection signal acquisition processing device central processing unit by the remote signalling sample circuit, the logical connection with controlling output circuit of central processing unit outputs a control signal to the earthing test source apparatus, two output terminals in addition of earthing test source apparatus are connected on respectively on the grounded screen, and the A/D digital to analog converter passes through electric current, voltage transmitter is connected with grounded screen to be measured.
4, the detection system that is applied in generating plant according to claim 3, the transformer station's large-scale grounding network detection technique is characterized in that the frame mode of each module for pegging graft in the native system signal pickup assembly.
5, the detection system that is applied in generating plant according to claim 3, the transformer station's large-scale grounding network detection technique is characterized in that software adopts modular design on this detection system computing machine, and algorithm adopts the fast Flourier compute mode.
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