CN105137292A - Direct-current signal intelligent acquiring device used for high-voltage cable fault positioning - Google Patents
Direct-current signal intelligent acquiring device used for high-voltage cable fault positioning Download PDFInfo
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- CN105137292A CN105137292A CN201510609209.2A CN201510609209A CN105137292A CN 105137292 A CN105137292 A CN 105137292A CN 201510609209 A CN201510609209 A CN 201510609209A CN 105137292 A CN105137292 A CN 105137292A
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Abstract
The invention discloses a direct-current signal intelligent acquiring device used for high-voltage cable fault positioning. A stable current signal is applied on one end of a cable. The direct-current signal intelligent acquiring device is connected to a test end of a to-be-tested cable and a test end of an auxiliary cable. The other terminal of the cable is shortly circuited. The acquiring device automatically acquires and processes voltage and current signals. Via simulation and digital filtering, percentage of a fault point and the distance between the fault point and the test ends can be directly displayed by the intelligent voltage comparison method. The intelligent acquiring device is advantageous in that the intelligent acquiring device can be used for fault positioning of a complex high voltage cable system in a power transmission network; fault searching efficiency of the cable is increased; power-off time is reduced; reliability of power supply is improved; and the intelligent acquiring device has a high market application value.
Description
Technical field
The present invention relates to a kind of electric power system fault locating device, particularly relating to a kind of direct current signal intelligent acquisition device for searching power cable fault point.
Background technology
The advantages such as high-tension cable takes up an area less with it, lay convenience, personal safety guarantee, power supply reliability is high, maintenance workload is few are widely applied in high voltage power transmission and transforming network.The develop rapidly of building along with China large-and-medium size cities and the requirement of city planning, the scale of electric system power transmission and transformation network is also increasing, especially the high voltage power transmission and transforming network of 110kV and above grade.Cable in network, is also a complicated system, may contains GIS terminal; T joint may be contained; May be long transmission line, comprise multiple cross interconnected section.Cable, often several days cannot fault point once there is insulation breakdown, delays power-on time, reduces power supply reliability.
In the market Murray bridge method and row wave reflection two kinds are mainly utilized for cable fault location in 110kV and above power transmission and transformation network.
And utilize Murray electric bridge to be classical way to breakdown point location, conveniently and accurately, as Fig. 1.But electric bridge can only obtain number percent, artificial calculating trouble spot distance.Sometimes some fault electric bridge also cannot be located, and main cause is: close on the load current running cable and produce power frequency magnetic field, at failure cable XY, and relief cable MN, the region XYNM surrounded produce induced voltage.At galvanometric 2 end M, X-shaped becomes may more than the power-frequency voltage of 100V, and the DC potential difference only mV level for locating.Therefore, galvanometer easily damages, or can not balance, or participates in bridge balance because exchange, and localization ratio error is very large.
Row wave reflection method is secondary pulse process, three subpulse method and pulse current methods mainly.The waveform that pulse current method records is complicated, and understand difficulty of getting up, babe in the wood is difficult to the reflected impulse identifying trouble spot.As Fig. 2, secondary pulse process remains the way of pulse current method high-voltage signal breakdown fault point, Low Voltage Impulse Method is introduced the test of high resistive fault, and waveform is easier to understand, and is convenient to grasp.As Fig. 3, three subpulse methods, first by high pressure short-time pulse breakdown fault point, maintain sufficiently long arcing followed by middle pressure pulse, make action of low-voltage pulse synchronous more reliable.But because high-tension cable has cross interconnected, T joint, wave impedance produces sudden change, makes location reflection wave very complicated, and be difficult to location, high-voltage pulse also has energy loss at this point, be difficult to arrive at a distance.
Summary of the invention
For the problems referred to above, through a large amount of explorations and summary of experience, the present invention proposes a kind of direct current signal intelligent acquisition device for complex high voltage cable system localization of fault in power transmission network to improve cable fault search efficiency.
According to technical scheme provided by the invention, the described direct current signal intelligent acquisition device for high-tension cable localization of fault comprises: sampled voltage protection filtering circuit, sample rate current protection filtering circuit, sample resistance, signal amplifies and A/D convertor circuit and intelligent processing unit, two input ends of described sampled voltage protection filtering circuit are connected to the test lead of tested cable and relief cable, external high-voltage constant current source is connected respectively to the test lead of tested cable and relief cable through sample resistance, described tested cable and another terminals short circuit of relief cable, two input ends of sample rate current protection filtering circuit connect the two ends of sample resistance, described sampled voltage protection filtering circuit, the output terminal of sample rate current protection filtering circuit amplifies respectively through a road signal and A/D convertor circuit is connected to intelligent processing unit, described sampled voltage protection filtering circuit exchanges and high frequency background undesired signal for suppressing the high frequency in sampled voltage, high-voltage pulse and eliminating, and is amplified and A/D convertor circuit by filtered Signal transmissions to rear stage signal, described sample rate current protection filtering circuit exchanges and high frequency background undesired signal for suppressing the high frequency in sample rate current, high-voltage pulse and eliminating, and is amplified and A/D convertor circuit by filtered Signal transmissions to rear stage signal, described signal amplifies and DC small signal is amplified by A/D convertor circuit, and DC voltage, current analog signal are converted to digital data transmission to intelligent processing unit.
Concrete; described sampled voltage protection filtering circuit comprises: two input ends of sampled voltage protection filtering circuit connect two input ends of air discharge tube CR1 two ends, filter capacitor C1 two ends, common mode inductance L1 respectively; two output terminals of common mode inductance L1 connect voltage dependent resistor (VDR) RV1 two ends, filter capacitor C2 two ends respectively; contact resistance R1 one end, filter capacitor C2 one end; the filter capacitor C2 other end connects filter capacitor C3 one end ground connection, and the resistance R1 other end is connected with the filter capacitor C3 other end and as signal output part.Described sample rate current protection filtering circuit protects filter circuit construction identical with sampled voltage.
Concrete, described signal amplifies and A/D convertor circuit adopts analog to digital converter AD7715.Described signal amplifies and uses I between A/D convertor circuit and intelligent processing unit
2c bus is connected.
Advantage of the present invention is: the present invention utilizes small signal process acquisition technique and filtering technique to design satisfactory direct current signal intelligent acquisition device.Harvester is placed in hot end, and display screen and operation are also placed in hot end.The powerful filter function of harvester, at the AC influence of short time filtering 200V peak value, can accurately can detect again the direct current signal of tens microvolts.Therefore, this direct current signal intelligent acquisition device for complex high voltage cable system localization of fault in power transmission network improves cable fault search efficiency, shortens power off time, improves power supply reliability, has good market using value.
Accompanying drawing explanation
Fig. 1 is bridge method positioning principle figure.
Fig. 2 is secondary pulse process schematic diagram.
Fig. 3 is three subpulse method schematic diagrams.
Fig. 4 is enforcement schematic diagram of the present invention.
Fig. 5 is circuit structure block diagram of the present invention.
Fig. 6 is sampled voltage protection filtering circuit schematic diagram.
Fig. 7 is sample rate current protection filtering circuit schematic diagram.
Fig. 8 is that signal amplifies and A/D convertor circuit schematic diagram.
Fig. 9 is intelligent processing unit circuit theory diagrams.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Collection technology, filtering technique, modern communications technology, high-low pressure isolation technology are applied in high-tension cable troubleshooting equipment by the present invention.High-tension cable localization of fault difficult point is that voltage is high, possibility several kilovolts; Hz noise is large, may reach 200V; Tested direct current signal is little, may only have tens microvolts.Therefore can design a harvester, can tolerate 10kV voltage over the ground, have powerful filter function, have sampling with high precision AD, adopt light-coupled isolation between simulating signal and digital signal, connecting a key operation switch by insulation bar can supply human body direct control.
Overall troubleshooting scheme is: by applying steady current signal in cable one end, direct current signal intelligent acquisition device is connected to the test lead of tested cable and relief cable, another terminals short circuit of cable, harvester automatically gathers and processes voltage and current signal, by analog-and digital-filtering, just can apply intelligent voltage relative method afterwards and directly show trouble spot number percent and trouble spot distance test end distance.Principle as shown in Figure 4.
As shown in Figure 5, direct current signal intelligent acquisition device for high-tension cable localization of fault of the present invention comprises: sampled voltage protection filtering circuit, sample rate current protection filtering circuit, sample resistance, signal amplifies and A/D convertor circuit and intelligent processing unit, two input ends of described sampled voltage protection filtering circuit are connected to the test lead of tested cable and relief cable, external high-voltage constant current source is connected respectively to the test lead of tested cable and relief cable through sample resistance, described tested cable and another terminals short circuit of relief cable (tubbiness wiring), two input ends of sample rate current protection filtering circuit connect the two ends of sample resistance, described sampled voltage protection filtering circuit, the output terminal of sample rate current protection filtering circuit amplifies respectively through a road signal and A/D convertor circuit is connected to intelligent processing unit.
Signal processing flow is described as follows:
1, signal input: the loop-around test voltage and current signal that failure cable and relief cable are formed.
2, sampled voltage protection filtering circuit and sample rate current protection filtering circuit complete signal protection to sampled voltage and sample rate current and signal filtering function respectively.
Wherein signal protection refers to: protect signal input circuit, mainly suppresses high frequency, high-voltage pulse to the interference of rear stage mimic channel and digital circuit.
Signal filtering refers to: eliminate and exchange and high frequency background undesired signal, extract DC voltage and current information accurately.By filtered Signal transmissions to rear stage amplifying circuit.
3, the effective voltage that signal amplifies and A/D convertor circuit comes front stage circuits transmission, the DC small signal of electric current are amplified, then are carried out A/D conversion, that is: DC voltage and current analog signal are converted to digital signal, are convenient to following digital circuit process.
4, intelligent processing unit: gather small DC voltage and current digital signal, Intelligent Calculation, further filtering, rejects garbage, carries out analytical calculation, obtain the positional information of Method of Cable Trouble Point to data.Intelligent processing unit needs process digit manipulation turn-knob information, controls and optimum configurations to carry out operation to harvester.Result of calculation and collection voltage, current signal information show by intelligent processing unit on a display screen.All right display system parameter setting information on display screen, function menu.
As Fig. 6,7 is sampled voltage, current protection and filtering circuit respectively.Sampled current signals Itest is by sample resistance R signal conversion voltage, and remaining two circuit is just the same.Be described for sampled voltage protection filtering circuit below.As shown in Figure 6; sampled voltage protection filtering circuit comprises: two input ends of sampled voltage protection filtering circuit connect two input ends of air discharge tube CR1 two ends, filter capacitor C1 two ends, common mode inductance L1 respectively; two output terminals of common mode inductance L1 connect voltage dependent resistor (VDR) RV1 two ends, filter capacitor C2 two ends respectively; contact resistance R1 one end, filter capacitor C2 one end; the filter capacitor C2 other end connects filter capacitor C3 one end ground connection, and the resistance R1 other end is connected with the filter capacitor C3 other end and as signal output part.
Air discharge tube CR1, voltage dependent resistor (VDR) RV1 is used to absorbing peak pulse.Common mode inductance L1 suppresses common-mode signal entering signal to be amplified and AD conversion loop.Resistance R1 and electric capacity C3 forms RC low-pass filter circuit, suppresses Hz noise.
The signal of voltage and current amplifies the same with A/D convertor circuit, illustrates below for voltage circuit.Circuit as shown in Figure 8 completes RC filtering, amplifier is amplified and AD conversion.
U1 is four pin crystal oscillators, and pin has OE end, VCC end, GND end, OUT end.U2 is chip AD7715.AD7715 is the full simulation front end that a technical grade is applicable to low frequency measurement application, can directly accept the low imput of sensor, and produces serial digital output.AD7715 adopts sigma-delta switch technology, can realize the highest 16 nothings and lose code performance.Physical circuit is: voltage (electric current) signal connects 7 pin of electric capacity C8 one end, voltage stabilizing diode Z1 negative electrode and AD7715 through resistance R5, the 8 pin ground connection of the electric capacity C8 other end, voltage stabilizing diode Z1 anode, AD7715; Resistance R4 mono-termination supply voltage VDD, 6 pin of another termination capacitor C7 one end, electrochemical capacitor C9 anode and AD7715, the electric capacity C7 other end, electrochemical capacitor C9 negativing ending grounding; Resistance R6 mono-termination supply voltage VDD, 15 pin of another termination capacitor C10 one end, electrochemical capacitor C11 anode, AD7715, the VCC end of crystal oscillator and electric capacity C12 one end, the GND end of the electric capacity C10 other end, electrochemical capacitor C11 negative terminal, the electric capacity C12 other end, crystal oscillator, 4 pin of AD7715,10 pin, 11 pin, 16 pin ground connection; 2 pin of the OUT termination AD7715 of crystal oscillator; 9 pin of AD7715 connect positive reference voltage (2.5V).
Resistance R5 and electric capacity C8 forms capacitance-resistance low-pass filtering, stabilivolt Z1 overvoltage protection.Resistance R4, electric capacity C7, C9 form capacitance-resistance low-pass filtering, power filter.Resistance R6, electric capacity C10, C11 form capacitance-resistance low-pass filtering, power filter.12,13,14,1,5 pin of U2 are control pin, by mcu programming process, and the inner amplifier gain of control AD7715 and AD sampling range.
As shown in Figure 9, intelligent processing unit circuit forms primarily of U5, P5, P6, wherein U5 is embedded microprocessor ATmega64, this processor work time low in energy consumption, anti-electromagnetic interference capability is strong, being a technical grade processor, is the core component of data intelligence processing unit, is embedded with special data acquisition and handling procedure, the data-signal that before process, the A/D conversion of step voltage, electric current exports respectively, uses I between A/D change-over circuit and microprocessor U5
2c bus high speed transmission data.P5 and P6 is liquid crystal display, for showing intelligent processing unit result of calculation, and display system parameter setting information, function menu.
Described intelligent processing unit data acquisition and handling procedure sampled voltage and current signal, utilize digital filtering algorithm reject undesired signal and be optimized valid data.According to user's needs, software is conversion different cross section cable length automatically, shows abort situation number percent and trouble spot distance according to test result calculations.Software realizes three kinds of fault distance computing method automatically: method of section, voltage compare method and bridge method.Specific algorithm can use prior art, also can research and develop further.
Claims (5)
1. for the direct current signal intelligent acquisition device of high-tension cable localization of fault, it is characterized in that, comprise: sampled voltage protection filtering circuit, sample rate current protection filtering circuit, sample resistance, signal amplifies and A/D convertor circuit and intelligent processing unit, two input ends of described sampled voltage protection filtering circuit are connected to the test lead of tested cable and relief cable, external high-voltage constant current source is connected respectively to the test lead of tested cable and relief cable through sample resistance, described tested cable and another terminals short circuit of relief cable, two input ends of sample rate current protection filtering circuit connect the two ends of sample resistance, described sampled voltage protection filtering circuit, the output terminal of sample rate current protection filtering circuit amplifies respectively through a road signal and A/D convertor circuit is connected to intelligent processing unit, described sampled voltage protection filtering circuit exchanges and high frequency background undesired signal for suppressing the high frequency in sampled voltage, high-voltage pulse and eliminating, and is amplified and A/D convertor circuit by filtered Signal transmissions to rear stage signal, described sample rate current protection filtering circuit exchanges and high frequency background undesired signal for suppressing the high frequency in sample rate current, high-voltage pulse and eliminating, and is amplified and A/D convertor circuit by filtered Signal transmissions to rear stage signal, described signal amplifies and DC small signal is amplified by A/D convertor circuit, and DC voltage, current analog signal are converted to digital data transmission to intelligent processing unit.
2. as claimed in claim 1 for the direct current signal intelligent acquisition device of high-tension cable localization of fault, it is characterized in that, described sampled voltage protection filtering circuit comprises: two input ends of sampled voltage protection filtering circuit connect air discharge tube CR1 two ends respectively, filter capacitor C1 two ends, two input ends of common mode inductance L1, two output terminals of common mode inductance L1 connect voltage dependent resistor (VDR) RV1 two ends respectively, filter capacitor C2 two ends, contact resistance R1 one end, filter capacitor C2 one end, the filter capacitor C2 other end connects filter capacitor C3 one end and ground connection, the resistance R1 other end is connected with the filter capacitor C3 other end and as signal output part.
3. as claimed in claim 2 for the direct current signal intelligent acquisition device of high-tension cable localization of fault, it is characterized in that, described sample rate current protection filtering circuit protects filter circuit construction identical with sampled voltage.
4. as claimed in claim 1 for the direct current signal intelligent acquisition device of high-tension cable localization of fault, it is characterized in that, described signal amplifies and A/D convertor circuit adopts analog to digital converter AD7715.
5. as claimed in claim 1 for the direct current signal intelligent acquisition device of high-tension cable localization of fault, it is characterized in that, described signal amplifies and uses I between A/D convertor circuit and intelligent processing unit
2c bus is connected.
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Cited By (11)
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| CN106353657A (en) * | 2016-11-28 | 2017-01-25 | 国网福建省电力有限公司 | High-voltage direct current cable partial discharge intelligent monitoring device and monitoring method |
| CN106353643A (en) * | 2016-11-09 | 2017-01-25 | 雷细军 | Resistance proportion cable fault tester |
| CN106483355A (en) * | 2016-12-16 | 2017-03-08 | 中国电子科技集团公司第四十研究所 | A kind of novel current transformer |
| CN106950464A (en) * | 2017-03-19 | 2017-07-14 | 沈阳顺义科技有限公司 | A kind of certain type panzer Cable fault examination system based on path optimization |
| CN107167678A (en) * | 2017-05-08 | 2017-09-15 | 许继集团有限公司 | A kind of multifunctional analogue signal Acquisition Circuit |
| CN109001519A (en) * | 2018-09-10 | 2018-12-14 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrification positioning cable outer jacket breaks the apparatus and method of protective metal shell grounding point outside |
| CN109581147A (en) * | 2017-09-29 | 2019-04-05 | 利萨·德雷克塞迈尔有限责任公司 | Pass through the detection device and detection method of Constant current source sense vehicle data cable |
| CN110346688A (en) * | 2019-07-31 | 2019-10-18 | 广东电网有限责任公司 | A kind of high pressure complexity cable fault quick segmentation differentiates and localization method |
| CN110837025A (en) * | 2019-11-15 | 2020-02-25 | 国网江苏省电力有限公司盐城供电分公司 | Distribution line fault node identification system and method based on current analysis |
| CN112034304A (en) * | 2020-08-27 | 2020-12-04 | 杭州巨骐信息科技股份有限公司 | Isolation system between low-voltage circuit and data acquisition monitoring circuit |
| CN113552443A (en) * | 2021-06-08 | 2021-10-26 | 广西大学 | Hybrid connection high-voltage line fault identification method based on alternating current-direct current pulse and random forest |
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| CN106483355A (en) * | 2016-12-16 | 2017-03-08 | 中国电子科技集团公司第四十研究所 | A kind of novel current transformer |
| CN106950464A (en) * | 2017-03-19 | 2017-07-14 | 沈阳顺义科技有限公司 | A kind of certain type panzer Cable fault examination system based on path optimization |
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| CN109001519A (en) * | 2018-09-10 | 2018-12-14 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrification positioning cable outer jacket breaks the apparatus and method of protective metal shell grounding point outside |
| CN109001519B (en) * | 2018-09-10 | 2024-01-05 | 国网江苏省电力有限公司电力科学研究院 | Device and method for locating grounding point of cable metal sheath in electrified manner |
| CN110346688A (en) * | 2019-07-31 | 2019-10-18 | 广东电网有限责任公司 | A kind of high pressure complexity cable fault quick segmentation differentiates and localization method |
| CN110837025A (en) * | 2019-11-15 | 2020-02-25 | 国网江苏省电力有限公司盐城供电分公司 | Distribution line fault node identification system and method based on current analysis |
| CN112034304A (en) * | 2020-08-27 | 2020-12-04 | 杭州巨骐信息科技股份有限公司 | Isolation system between low-voltage circuit and data acquisition monitoring circuit |
| CN113552443A (en) * | 2021-06-08 | 2021-10-26 | 广西大学 | Hybrid connection high-voltage line fault identification method based on alternating current-direct current pulse and random forest |
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