CN101038262A - Device and method for online monitoring power supply system external Insulation filthy status - Google Patents
Device and method for online monitoring power supply system external Insulation filthy status Download PDFInfo
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- CN101038262A CN101038262A CN 200710017613 CN200710017613A CN101038262A CN 101038262 A CN101038262 A CN 101038262A CN 200710017613 CN200710017613 CN 200710017613 CN 200710017613 A CN200710017613 A CN 200710017613A CN 101038262 A CN101038262 A CN 101038262A
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Abstract
Aiming to some disadvantages in the passive on-line monitoring methods adopting sensors sampling in existence, the present invention provides an initiative type on-line monitoring device and method thereof with its monitoring system outer insulation surface being in a dirt state. The input of said monitoring device lower machine is connected respectively to two routes of sampling signals: one route is connected to a direct current superposition unit through a neutral point of a voltage transformer connected to a three-phase overhead line, wherein a protection unit and a filtering unit are connected in serial between the superposition unit and the ground, which output is connected to the lower machine through a sampling signal adjusting unit; the other route is connected to an impulse current sensor through a groups of connection wires between neutral points of three-phase high voltage isolation capacitor and the ground, which is connected to the lower machine through pulse shaping and a count unit. The present invention with a powerful anti-interference ability and without adding a sensor to insulators, is suitable for an on-line monitoring of the outer insulation dirt sate of AC220V-35kv low voltage distribution station/circuit.
Description
Technical field
The present invention relates to a kind of electric power system on-Line Monitor Device and method, the on-Line Monitor Device and the method for particularly a kind of short distance 220V～35kV power supply system external Insulation filthy status.
Background technology
Growing along with industrial and agricultural production, the external insulation surface contamination of electric power system is serious day by day, and the filth that deposits on the insulator is easy to take place pollution flashover in the bigger weather of humidity, have a strong impact on the reliability of electric power system.According to statistics, the pollution flashover accident number of times is only second to damage to crops caused by thunder in the total accident number of electric system, occupies the second, but the infringement that pollution flashover accident caused but is 10 times of damage to crops caused by thunder.The large tracts of land pollution flashover nearly all took place in the whole nation six big electrical networks, had caused very big economic loss.In order to address this problem, increase the number of insulator in the insulator chain, adopt anti-pollution insulator, be coated with hydrophobic coating at insulator surface, adopt composite organic insulator or semi-conducting glaze insulator, various measures such as insulator regularly cleans are all risen in actual motion be positive role.But all undesirable to the effect that reduces pollution flashover accident, one of reason is the comprehensively real information that lacks about the insulator contamination degree.
Usually the contaminated insulator pollution level can be weighed by following index: equivalent salt deposit density, filthy surface conductivity, leakage current and flashover field intensity etc., wherein leakage current is creepage than distance by instantaneous reality, the dynamic indicator of weather and pollution level decision.The pollutant of defilement and insulation sub-surface is filthy as industry, naturally saline and alkaline and dust etc. is nonconducting when drying, if but the humidity of air is very high, it is wet that pollutant will become, electric conductivity will be strengthened, leakage current also just increases, and when the leakage current effective value has only several mA or tens mA, the insulator operation is pollution flashover not to take place; Be that pollution flashover just takes place probably under the situation of hundreds of mA when leakage current.Estimate the pollution level of insulator by the leakage current (defilement and insulation resistance) of on-line real time monitoring insulator, and before pollution flashover takes place, provide pollution flashover and report to the police, thereby, can further improve the safe operation efficient of electric power system for the maintenance that realizes a plan provides condition to the transition of repair based on condition of component.In addition, leakage current is relatively easily measured, and is suitable for online detection, and it has comprised the enough information of insulator running status.But, to each insulator of system and sleeve pipe all sensor installation (collector ring) be unpractical, therefore, can't gather the leakage current on all external insulation surfaces simultaneously.
At present, the power supply system external Insulation filthy of existing different structure and flashover current on-Line Monitor Device, adopt the passive on-line monitoring method of sensor sampling mostly, different difference is mainly on signal transmission and processing mode, and sampling method is almost identical, promptly needs to each detected insulator or the independent sensor installation of sleeve pipe.Thereby expose following deficiency, (1) is existing can't monitor all insulators or sleeve pipe for the On-line Measuring Method of face simultaneously with point; (2) measure timesharing along separate routes and carry out, can't realize high-speed sampling; (3) sensor line is many and complicated; (4) be passive monitoring mode, the sampling new signal degree that is interfered is bigger.
Summary of the invention
The present invention is directed to existing existing defective of passive on-line monitoring method or the deficiency that adopts the sensor sampling, a kind of on-Line Monitor Device and method of active monitoring electric system external insulation surface filth state are provided, need not insulator to be measured is installed additional sensor, and the antijamming capability of monitoring device is strong.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of on-Line Monitor Device of power supply system external Insulation filthy status, comprise that one has the slave computer of man-machine interface, the filthy acousto-optic warning unit that is connected with the control output of this slave computer and filthy the demonstration in real time and assessment unit, it is characterized in that, the input of described slave computer connects the two-way sampled signal respectively, wherein:
The neutral point O of the star connection threephase potential transformer that links to each other with the three-phase pole line of leading up to is connected a DC stacked unit; this DC stacked unit is serially connected with protection and filter unit between over the ground, and the output of this protection and filter unit is nursed one's health the unit by a sampled signal and is connected to slave computer.
Another road connects a pulses of current sensor by the neutral point P line extremely of first group of star connection three-phase high-voltage blocking capacitor, this pulses of current sensor is connected to slave computer by a shaping pulse and counting unit, and described first group of star connection three-phase high-voltage blocking capacitor and star connection threephase potential transformer also connect.
In the technique scheme, comprise an excitation power supply E in the described DC stacked unit
nIts positive pole is held back the neutral point O that the stream inductance L is connected to voltage transformer (VT) by one; power cathode is connected to protection and filter unit; the described normally open contact of holding back the two-way stack K switch 1 of connecting between stream inductance L and the neutral point O; the normally closed interlock of the two-way stack K switch 1 of serial connection between neutral point O and the power cathode, and interchange pass capacitor C1 in parallel.Described excitation power supply E
nBe direct supply or the low frequency sine power supply of 1～10V; To 220V～10kV circuit, E
nBe 1～4V, to 35kV circuit, E
nBe 5～10V.
Described protection and filter unit are made of a wave filter and a connected automatic ground protection circuit.Described automatic ground protection circuit comprises an automatic grounding switch K2 who is connected with the output of DC stacked unit, a pass capacitor C2 and a fast thawing insurance; The first throwing point a of described automatic grounding switch K2 is connected to wave filter by described fast thawing insurance; the direct ground connection of the second throwing point b of automatic grounding switch K2, and in parallel respectively with a gas-discharge tube, a big electric current earth leakage protector and described pass capacitor C2.
A kind of on-line monitoring method of power supply system external Insulation filthy status is characterized in that slave computer is monitored in real time by the two paths of signals gatherer process, wherein:
One tunnel signals collecting is: in the threephase potential transformer neutral point O of the star connection that links to each other with the three-phase pole line, by DC stacked unit to direct current of tested three-phase overhead transmission line stack or low-frequency excitation power supply E
n, be used to produce direct current or low frequency superimposed current I
dAt excitation power supply E
nOver the ground by a protection and filter unit, filtering flow through the three-phase imbalance electric current and the alternation interference current of threephase potential transformer neutral point, DC stacked unit, and to direct current or low frequency superimposed current I
dExcess current carry out grounding safety protection; By sampled signal conditioning unit sampling resistor pick up direct current or low frequency superimposed current I
dSignal, and this signal amplified be input to slave computer and carry out computing, slave computer adopts A/D converter that the superimposed current of gathering is converted to digital signal and it is converted into total insulation resistance, provides R
z～t curve shows and storage;
Another road signals collecting is: by with the neutral point P of threephase potential transformer and first group of three-phase high-voltage blocking capacitor connecing line to ground, connect the pollution flashover pulse current that a pulses of current sensor is used to gather three-phase pole line external insulation, this pulse current is input to the judgement of carrying out transmission line of electricity external insulation pollution state in the slave computer by shaping pulse and counting unit shaping and counting, in conjunction with the R of the transmission line of electricity external insulation electrical resistance monitoring that described stacking method obtained
z～t curve generalization carries out the surface filth state analysis, at last according to slave computer critical setup parameter built-in or by the man-machine interface input, is carried out by filthy acousto-optic warning unit and to report to the police.
In the said method, described excitation power supply E
nBe direct supply or the low frequency sine power supply of 1～10V; To 220V～10kV circuit, E
nBe 1～4V, to 35kV circuit, E
nBe 5～10V.
Described to direct current or low frequency superimposed current I
dGrounding safety protection be in protection and filter unit, adopt automatic grounding switch K2, fast thawing insurance, gas-discharge tube and greatly the electric current earth leakage protector realize multiple protective, work as electric current I
dExceed standard,, make and measure the input short circuit by automatic switch K2 action; Work as electric current I
dBigger or automatic switch K2 has little time action, by the fast thawing fuse melting, makes the discharge conducting of alternating voltage rising back, gas-discharge tube both sides, makes the input short circuit; Work as electric current I
dExcessive, gas-discharge tube is burnt, carry out big electric current earth leakage protector ground connection by force at last, guarantee monitoring device and personal security.
Compared with prior art, the present invention has following advantage:
(1) adopt active external insulation surface resistance on-line measurement mode, it is by the sampling test in DC stacked source, and antijamming capability is strong, can obtain overall system external insulation resistance simultaneously, and then obtains overall system external insulation pollution state, and test data is stable; Because DC stacked electric current detecting method is with respect to the easier measurement of ac leakage current, and antijamming capability is strong, is more suitable for online detection.Simultaneously, R
z～t curve data comprises the enough information of overall system insulation running status.Therefore, adopt the sinusoidal superimposed current of measurement direct current or low frequency to come the running status of evaluating system insulation among the present invention, this is the essential distinction of the present invention and current filthy on-line monitoring mode.
(2) need not insulator to be measured is installed additional sensor (collector ring), can make at-once monitor the comprehensive pollution level of the overall insulation of electric power system; Has insulation degradation function in the monitoring electrical power trans mission/distribution system simultaneously;
(3) designed filtering circuit based on defencive function, carry out multiple protective by quick fuse, gas-discharge tube, Automatic Protection Switching and big electric current ground protection etc., these protection relative merits remedy mutually, can play a protective role well, guarantee the safety of personnel and equipment; Simultaneously by wave filter filtering three-phase imbalance electric current and alternation interference current.
(4) can in time report to the police according to the electric power system variation tendency that totally insulate, prompting external insulation cleaning opportunity, in to the power supply system external Insulation filthy status on-line monitoring, also can find range system's transient state or permanent fault earth point.
Apparatus of the present invention are mainly used among AC220V～35kV, the on-line monitoring of low-voltage distribution station/circuit external insulation pollution state, have the overall state of insulation effect of on-line monitoring line system concurrently.
Description of drawings
Fig. 1 is the structural drawing of on-Line Monitor Device of the present invention.Wherein: 1. three-phase pole line, 2. insulator, 3. threephase potential transformer, 9. pulses of current sensor, 11. first groups of three-phase high-voltage blocking capacitors, 12. second groups of three-phase high-voltage blocking capacitors.
Fig. 2 is the circuit theory diagrams of the DC stacked unit among Fig. 1.Wherein, E
nBe excitation power supply, L is for holding back the stream inductance, and K1 is two-way stack switch, and C1 is for exchanging pass capacitor.
Fig. 3 is the protection among Fig. 1 and the circuit structure diagram of filter unit.Wherein, 21 is big electric current earth leakage protector, and 22 is gas-discharge tube, and 23 are the fast thawing insurance, and K2 is automatic grounding switch, and C2 is for exchanging pass capacitor.
Fig. 4 is the graph of a relation of electrical power trans mission/distribution system insulation against ground resistance and DC stacked power supply.R among the figure
0Be excitation power supply E
nInternal resistance.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the on-Line Monitor Device of a kind of power supply system external Insulation filthy status of the present invention, comprise a slave computer 8 that has man-machine interface 7, filthy acousto-optic warning unit 14 that is connected with the control output of this slave computer 8 and the filthy assessment unit 15 that shows in real time, the input of slave computer 8 connects the two-way sampled signal respectively, the neutral point O of threephase potential transformer 3 of the star connection that links to each other with three-phase pole line 1 of wherein leading up to is connected a DC stacked unit 4, this DC stacked unit 4 is serially connected with protection and filter unit 5 between over the ground, and the output of this protection and filter unit 5 is nursed one's health unit 6 by a sampled signal and is connected to slave computer 8; Another road sampled signal connects a pulses of current sensor 9 by the neutral point P line extremely of first group of three-phase high-voltage blocking capacitor 11, this pulses of current sensor 9 is connected to 8, the first groups of star connection three-phase high-voltages of slave computer blocking capacitor 11 and star connection threephase potential transformer 3 by a shaping pulse and counting unit 10 and connects.Described slave computer 8 is a MCS51 type single-chip microcomputer; Pulses of current sensor is 9 CHT70/75/150AV type sensors, and voltage transformer (VT) 3 is a JDZJ type three-phase mutual inductor.
In the present embodiment, first group of star connection three-phase high-voltage blocking capacitor 11 also can and connect second group of star connection three-phase high-voltage blocking capacitor 12 with star connection threephase potential transformer 3 joints, connect a fault ground point range cells 13 to slave computer 8, be used for the position of fault location earth point, be convenient to scheduled overhaul.
As shown in Figure 2, superpositing unit 4 comprises an excitation power supply E
nCan be 1～10 volt direct supply or low frequency sine power supply; its positive pole is held back the stream inductance L by one and is connected to neutral point O; power cathode is connected to protection and filter unit 5; the described K switch 1 that superposes of also connecting between stream inductance L and the neutral point O of holding back, high pressure blocking capacitor C1 of parallel connection between neutral point O and the power cathode.K1 is a two-way relay switch, is slave computer 8 programme controlled automatic switches, and closed K1 normally open contact (this moment, normally closed interlock disconnected) is realized excitation power supply E
nIn the neutral point O of threephase potential transformer 3 and the stack between the protection filter unit 5, the K1 normally open contact is broken as the state before slave computer 8 on-Line Monitoring Program start.Hold back the stream inductance L for being the ferromagnetic coil of 100V, 1W, capacitor C
1PP (polypropylene) capacitor for 100V, 0.1～5 μ F.
When stack K switch 1 was failure to actuate, normally closed interlock guaranteed the hard ground connection that the threephase potential transformer neutral point O keeps O to order by normally closed interlock K1 and filtering protector protection switch K2.When the programmed control of slave computer 8 superposes K switch 1 and filtering protector grounding switch K2 action, direct current or low-frequency excitation power supply E
nVoltage by holding back streamline circle L and threephase potential transformer 3 is sent to three-phase pole line 1, direct current that is produced or low frequency superimposed current are mainly the electric current I of current through line external insulation surface filth layer
d, this electric current is got back to excitation power supply E via the sampling resistor of the earth and signal condition unit 6
nNegative pole.Flow through the three-phase imbalance electric current of threephase potential transformer neutral point O, DC stacked unit 4 and wave filter 5 and alternation interference current by 24 filterings of the wave filter among Fig. 3, and direct current or low frequency superimposed current signal are picked up by the sampling resistor of signal condition unit 6 after filtering and via this cell processing.The alternating current path of this moment is kept by pass capacitor C1 and C2.
As shown in Figure 3, protection and filter unit 5 are made of a wave filter 24 and a connected automatic ground protection circuit 20, automatically ground protection circuit 20 comprises the automatic grounding switch K2 of a single-pole double-throw (SPDT), the first throwing point a of double throw switch K2 is connected to wave filter 24 by a fast thawing insurance 23, and wave filter 24 is a two π type LC high-order low-pass filter; The direct ground connection of the second throwing point b of double throw switch K2, and with a gas-discharge tube 22, big electric current earth leakage protector 21 with to exchange pass capacitor C2 in parallel respectively.Wherein gas-discharge tube 22 employing models are the ceramic discharge tube of B8G070H; special electric material is equipped with in the inside; can guarantee to be added to above threshold voltage (during power frequency threshold voltage＜70V) at voltage; discharge; the pipe equivalent resistance is infinitely great under the normal condition, protection surveying instrument and operating personnel's safety.For preventing that contingency from unpredictable single phase power supply system's external insulation puncture ground fault taking place and the threephase potential transformer breakdown accident may be to the threat of personnel and equipment; present embodiment has been developed big electric current (more than the 100A) earth leakage protector 21 specially, can guarantee that big ground current continues to circulate more than a few hours.Big electric current earth leakage protector is to utilize interval film material between the sharp-pointed parallel pole of two metals; the ultimate principle of utilizing most advanced and sophisticated electric field intensity relatively to concentrate; make film under lower voltage, realize puncture short; puncturing between rear electrode is short-circuit condition; because the parallel pole area is big; so through-current capability is strong, be unlikely to that protector burns and ineffective.This protection is disposable use, needs after the action once to change, and can effectively protect the safety of the person and equipment.But in the ordinary course of things, because the various safeguard measures of front, this protector is last protection, so on-line monitoring generally is unlikely to puncture and needs to change.As any one link action of multiple protective, on-Line Monitor Device quits work, and just can resume operation after need manually fixing a breakdown.
The principle of work of protection and filter unit 5 is as follows: during operate as normal, and the DC current I that DC stacked unit 4 is sent here by the earth by the total insulation of distribution system
dThe first throwing point a of signal by automatic grounding switch K2 directly enters wave filter 24 and carries out low-pass filtering.When monitored circuit or threephase potential transformer break down, the electric current of sending here by DC stacked unit 4 by the O point exceed standard (being mainly the 50Hz power current) reach more than hundreds of mA, automatic switch K2 action makes and measures input short circuit (also being that k2 connects the second throwing point b); If electric current I
dBigger or automatic switch K2 has little time action, and fast thawing insurance 23 fusing cause gas-discharge tube 22 both sides alternating voltages to raise, and when surpassing the gas discharge pipe threshold, discharge tube 22 conductings make the input short circuit; Protection instrument and personal security.If discharge current is excessive, cause gas-discharge tube 22 also to burn, last protection is just carried out by big electric current earth leakage protector 21.Because this protector discharge current can reach 100A, the insurable equipment input end is in electronegative potential all the time, and insurable equipment, personnel are perfectly safe.
Another embodiment of apparatus of the present invention is exactly on the architecture basics of device shown in Figure 1, can slave computer 8 and a long-range host computer be connected by the mode of radio communication, carries out real-time telemetry.
A kind of on-line monitoring method of above-mentioned real-time monitoring device according to the present invention, by DC stacked unit 4 to driving voltage E of tested three-phase overhead transmission line 1 stack
n, to 220V～10kV circuit, the property point 1～4V that superposes between over the ground in the line, to the 35kV circuit, the property point direct electromotive force. E of 5～10V that superposes between over the ground in the line
nThis superimposed voltage can be added in the both sides of all insulation against ground of circuit, and direct current that is produced or low frequency superimposed current are mainly the electric current I of the external insulation surface filth layer of flowing through
d, this electric current is got back to the excitation power supply negative pole via the sampling resistor of the earth and signal condition unit 6.Flow through the three-phase imbalance electric current and filtered device 24 filterings of alternation interference current of threephase potential transformer neutral point, DC stacked unit 4 and protection filter unit 5; direct current or low frequency superimposed current signal are picked up by the sampling resistor of signal condition unit 6; and be input to slave computer 8 after amplifying via signal condition unit 6 and carry out computing, slave computer 8 adopts A/D converters to be digital signal with the superimposed current conversion of signals of gathering and it is converted into total defilement and insulation resistance R
z, provide R
z～t curve, the storage back shows in real time on the assessment unit 15 in filth and shows.
When apparatus of the present invention are carried out the monitoring of electric power system external insulation surface filth insulation resistance by the sampled signal of DC stacked unit 4, protection and filter unit 5; by with the neutral point P of threephase potential transformer and first group of three-phase high-voltage blocking capacitor 11 connecing line to ground; connect a pulses of current sensor 9; gather the pollution flashover pulse current of three-phase pole line 1 external insulation, this pulse current can obtain electric power system external insulation surface pollution flashover electric current times N by the shaping of shaping pulse and counting unit 10
RAnd the waveform of pollution flashover electric current, come the R of transmission line of electricity external insulation electrical resistance monitoring that the described stacking method of electric power system external insulation surface filth combinations of states is obtained by computer system 8
z～t curve generalization is analyzed, is judged, exporting the filthy assessment unit 15 of demonstration in real time to intuitively shows, and according to the critical parameters of computer system 8 settings built-in or by man-machine interface 7 inputs, output a control signal to filthy acousto-optic warning unit 14 and carry out warning, whether prompting electric line external insulation needs to clean or safeguard at present.
Described slave computer 8 also can be according to traveling wave method, promptly by fault ground point range cells 13 to little pulse voltage of transmission line of electricity stack, measure the pulse time of return, obtain transient state or continuous earth point position.
As shown in Figure 4, total insulation resistance
Be actually all interior insulation resistance R of system's (circuit)
InWith the external insulation resistance R
OutwardParallel connection, promptly
And external insulation resistance
Because interior insulation resistance R
InIrrelevant with atmospheric environment, when interior insulation is good, R
In＞＞R
Outward, and R
Outer body＞＞R
Outside surface, therefore, thinking measured is the external insulation surface resistance R
Outward≈ R
Outside surfaceWhen the external insulation fault, R
InWith R
OutwardBe more or less the same total insulation resistance R
zBe all interior insulation resistance of circuit and external insulation surface resistance R
OutwardParallel connection.When remarkable insulation degradation appears in interior insulation, the total insulation resistance R of system
zMaintain a more stable low-resistance level during with length, computing machine is distinguished and Realtime Alerts according to the stability of interior insulating resistance value and the external insulation resistance of fluctuation.
According to measured result to low-voltage circuit, surface filth insulation resistance R
Outside surfaceFor 220V～35kV circuit, generally between tens M Ω～G Ω, insulation resistance can descend two more than the order of magnitude than fine day during the rainy day.
Total insulation resistance R
zIn comprise the abundant information of insulator contamination situation.When filth is made moist seriously, will be very big in the filthy DC leakage current value of high-tension line insulator or sleeve surface, filthy resistance value can descend two more than the order of magnitude, and we can be total insulation resistance R
zSize as one of safe operation of electric network whether criterion.
Below respectively to specifying that supply line's external insulation pollution on-line monitoring interpretation of result of two kinds of different electric pressures is judged:
(1) to the on-line monitoring of 10kV power supply system external Insulation filthy status, by the excitation power supply E of said apparatus of the present invention
nTo the DC voltage of a 1V of circuit stack or frequency is 1V sinusoidal voltage about 5Hz; This superimposed voltage can act on the both sides of all insulation against ground of circuit, direct current that is produced or interchange low frequency superimposed current I
dBe the electric current of the external insulation surface filth layer of flowing through, this electric current is got back to excitation power supply E via the sampling resistor of the earth and signal condition unit 6
nNegative pole.At excitation power supply E
nOver the ground by protection and filter unit 5, filtering flow through the three-phase imbalance electric current and the alternation interference current of threephase potential transformer neutral point O, DC stacked unit 4 and wave filter 24; By signal condition unit 6 sampling resistor pick up DC stacked current signal less than 1 μ A, being converted into total defilement and insulation resistance is more than the 5M Ω, this moment state of insulation good.With quadrat method rainy day or relative humidity greater than 70% o'clock, by signal condition unit 6 sampling resistor pick up direct current or low frequency superimposed current signal greater than 5 μ A, being converted into total defilement and insulation resistance is below the 1M Ω, this moment, state of insulation was bad, need in time to handle (to the body insulation) or cleaning (externally insulating surface): when the following stake resistance of lasting 1M Ω above 1 hour, there is earth point in the insulation of system prompt body, start the earth point distance measurement function, point out the earth point position, prompting must be handled or change this shaft tower insulator in the short as far as possible time; When the lasting 1M Ω stake resistance time less than 1 minute, it is serious that this earth fault of system prompt belongs to the external insulation surface filth, need be in the to the greatest extent short time to earthing position near external insulation clean.If the sampling resistor of signal condition unit 6 picks up direct current or sinusoidal superimposed current signal excessive (greater than 1mA), and the time was above 10 minutes, on-Line Monitor Device is by the serious deterioration of software prompt line insulation state, system earth resistance is less than 5k Ω, ground connection loss excessive (having surpassed 20kW), there is the continuous earth point in the body insulation, starts the earth point distance measurement function, and caution is interruption maintenance immediately.
(2) to the on-line monitoring of 35kV power supply system external Insulation filthy status, the continuous-current excitation power supply E of this moment
nDC voltage or the sinusoidal voltage that frequency is the 5V about 5Hz to a 5V of circuit stack, sampling resistor by signal condition unit 6 picks up DC stacked current signal to be continued less than 0.05 μ A, be converted into total defilement and insulation resistance for 100M Ω and more than, this moment state of insulation good.With quadrat method rainy day or relative humidity greater than 70% o'clock, by signal condition unit 6 sampling resistor pick up DC stacked current signal greater than 5 μ A, be converted into total defilement and insulation resistance be continuously 1M Ω and more than, this moment, state of insulation was bad, need in time to handle (to the body insulation) or cleaning (externally insulating surface): when lasting 1M Ω stake resistance above 1 hour, there is earth point in the insulation of system prompt body, start the earth point distance measurement function, point out the earth point position, prompting must be handled or change this shaft tower insulator in the short as far as possible time; When the lasting 1M Ω stake resistance time less than 1 minute, it is serious that this earth fault of system prompt belongs to the external insulation surface filth, need clean external insulation in the to the greatest extent short time.If signal condition unit 6 sampling resistor pick up direct current or sinusoidal superimposed current signal excessive (greater than 1mA), and the time was above 10 minutes, on-Line Monitor Device is by the serious deterioration of software prompt line insulation state, system earth resistance is less than 5k Ω, ground connection loss excessive (having surpassed 122.5kW), there is the continuous earth point in the body insulation, starts the earth point distance measurement function, and caution must have a power failure immediately to dock and be located in the insulator maintenance.
Apparatus of the present invention also can be installed the temperature and humidity sensor and be come measures ambient temperature and atmospheric humidity, to grasp the total insulation resistance R under the weather extremes
zSituation of change, determine the filthy state of external insulation of circuit and the alarm parameters of setting computer acousto-optic warning unit.The software that is arranged in the computer system 8 can be according to the fine or stable insulation resistance that just cleaned external insulation or new laying-out as in the interior insulation resistance R, and then obtains total insulation resistance R
zDetermine four kinds of character of this low resistance according to the low-resistance duration: interior insulation ag(e)ing, filthy severe overweight, flashover ground connection, earth fault.Implement to report to the police and provide corresponding processing suggestion according to low resistance character: insulation in checking, cleaning, search earth point (range finding).
Software is by the superimposed current sample information, in conjunction with pollution flashover impulse sampling information the state of insulation of electrical power trans mission/distribution system is provided multifactorial evaluation, and with critical setup parameter (certain evaluation criterion) built-in computer or by man-machine interface 7 input relatively after, provide and report to the police and the processing suggestion, start the fault ground distance measurement function.
Software of the present invention adopts Labview (Laboratory Virtual Instrument EngineeringWorkbench) and VC++ programming.Software function comprises System self-test, high-speed data acquisition, initial parameter is set, operational factor is set, the inquiry of historical data, carries out teledata inquiry or the like by modulator-demodular unit.
Claims (8)
1. the on-Line Monitor Device of a power supply system external Insulation filthy status, comprise that one has the slave computer of man-machine interface, the filthy acousto-optic warning unit that is connected with the control output of this slave computer and filthy the demonstration in real time and assessment unit, it is characterized in that, the input of described slave computer connects the two-way sampled signal respectively, wherein:
The neutral point O of the star connection threephase potential transformer that links to each other with the three-phase pole line of leading up to is connected a DC stacked unit, this DC stacked unit is serially connected with protection and filter unit between over the ground, and the output of this protection and filter unit is nursed one's health the unit by a sampled signal and is connected to slave computer;
Another road connects a pulses of current sensor by the neutral point P line extremely of first group of star connection three-phase high-voltage blocking capacitor, this pulses of current sensor is connected to slave computer by a shaping pulse and counting unit, and described first group of star connection three-phase high-voltage blocking capacitor and star connection threephase potential transformer also connect.
2. the on-Line Monitor Device of power supply system external Insulation filthy status according to claim 1 is characterized in that, comprises an excitation power supply E in the described DC stacked unit
nIts positive pole is held back the neutral point O that the stream inductance L is connected to voltage transformer (VT) by one; power cathode is connected to protection and filter unit; the described normally open contact of holding back the two-way stack K switch 1 of connecting between stream inductance L and the neutral point O; the normally closed interlock of this two-way stack K switch 1 of serial connection between neutral point O and the power cathode, and high pressure blocking capacitor C1 in parallel.
3. the on-Line Monitor Device of power supply system external Insulation filthy status according to claim 1 and 2, it is characterized in that, described protection and filter unit are made of a wave filter and a connected automatic ground protection circuit, and this automatic ground protection circuit comprises an automatic grounding switch K2 who is connected with the output of DC stacked unit, a pass capacitor C2 and a fast thawing insurance; The first throwing point a of described automatic grounding switch K2 is connected to wave filter by described fast thawing insurance; the direct ground connection of the second throwing point b of automatic grounding switch K2, and in parallel respectively with a gas-discharge tube, a big electric current earth leakage protector and described pass capacitor C2.
4. the on-Line Monitor Device of power supply system external Insulation filthy status according to claim 2 is characterized in that, described excitation power supply E
nBe direct supply or the low frequency sine power supply of 1～10V, during to monitoring 220V～10kV circuit, excitation power supply E
nBe 1～4V, during to monitoring 35kV circuit, excitation power supply E
nBe 5～10V.
5. the on-Line Monitor Device of power supply system external Insulation filthy status according to claim 1, it is characterized in that, described first group of three-phase high-voltage blocking capacitor and threephase potential transformer joint also connect the three-phase high-voltage blocking capacitor of second group of star connection, are used to connect fault ground point range cells to slave computer.
6. the on-line monitoring method of a power supply system external Insulation filthy status is characterized in that, slave computer is monitored in real time by the two paths of signals gatherer process, wherein:
One tunnel signals collecting is: in the threephase potential transformer neutral point O of the star connection that links to each other with the three-phase pole line, by DC stacked unit to excitation power supply E of tested three-phase overhead transmission line stack
n, be used to produce direct current or low frequency superimposed current I
dAt excitation power supply E
nOver the ground by a protection and filter unit, filtering flow through the three-phase imbalance electric current and the alternation interference current of threephase potential transformer neutral point, DC stacked unit, and to direct current or low frequency superimposed current I
dExcess current carry out grounding safety protection; Pick up direct current or low frequency superimposed current I by sampled signal conditioning unit
dSignal, and this signal amplified be input to slave computer, slave computer adopts A/D converter that the superimposed current of gathering is converted to digital signal and it is converted into total insulation resistance, provides R
z～t curve shows and storage;
Another road signals collecting is: by with the neutral point P of threephase potential transformer and first group of three-phase high-voltage blocking capacitor connecing line to ground, connect the pollution flashover pulse current that a pulses of current sensor is used to gather three-phase pole line external insulation, this pulse current is input to the judgement of carrying out transmission line of electricity external insulation pollution state in the slave computer by shaping pulse and counting unit shaping and counting, in conjunction with the R of the transmission line of electricity external insulation electrical resistance monitoring that described stacking method obtained
z～t curve generalization carries out the surface filth state analysis, at last according to slave computer critical setup parameter built-in or by the man-machine interface input, is carried out by filthy acousto-optic warning unit and to report to the police.
7. the on-line monitoring method of power supply system external Insulation filthy status according to claim 6 is characterized in that, described excitation power supply E
nBeing direct supply or the low frequency sine power supply of 1～10V, is 1～4V to monitoring 220V～10kV circuit, is 5～10V to monitoring 35kV circuit.
8. the on-line monitoring method of power supply system external Insulation filthy status according to claim 6 is characterized in that, and is described to direct current or low frequency superimposed current I
dGrounding safety protection be in protection and filter unit, adopt automatic grounding switch K2, fast thawing insurance, gas-discharge tube and greatly the electric current earth leakage protector realize multiple protective, work as electric current I
dExceed standard,, make and measure the input short circuit by automatic switch K2 action; Work as electric current I
dBigger or automatic switch K2 has little time action, by the fast thawing fuse melting, makes the discharge conducting of alternating voltage rising back, gas-discharge tube both sides, makes the input short circuit; Work as electric current I
dExcessive, gas-discharge tube is burnt, carry out big electric current earth leakage protector ground connection by force at last.
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| CN200710017613A CN100575936C (en) | 2007-04-03 | 2007-04-03 | A kind of on-Line Monitor Device of power supply system external Insulation filthy status and method |
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|---|---|---|---|
| CN200710017613A CN100575936C (en) | 2007-04-03 | 2007-04-03 | A kind of on-Line Monitor Device of power supply system external Insulation filthy status and method |
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| CN100575936C CN100575936C (en) | 2009-12-30 |
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| CN102508036A (en) * | 2011-11-02 | 2012-06-20 | 浙江大学城市学院 | On-line remote monitoring method and device for pollution state of disk insulator |
| CN102590720A (en) * | 2012-03-02 | 2012-07-18 | 济南威度电子科技有限公司 | High-voltage electrical insulated monitoring device with current limiting protection function |
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| CN112104065A (en) * | 2020-09-16 | 2020-12-18 | 中车青岛四方车辆研究所有限公司 | Control method of bidirectional charger for emergency traction of motor train unit |
| CN113866580A (en) * | 2021-11-22 | 2021-12-31 | 广东电网有限责任公司广州供电局 | Method and system for evaluating insulation damage probability of low-voltage direct-current system equipment |
| CN116399405A (en) * | 2023-06-07 | 2023-07-07 | 国网上海市电力公司 | Insulator string state diagnosis method and system based on multi-mode fusion perception |
| CN116399405B (en) * | 2023-06-07 | 2023-09-15 | 国网上海市电力公司 | Insulator string state diagnosis method and system based on multi-mode fusion perception |
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