CN205374670U - A tunable frequency oscillating wave circuit for power cable partial discharge detector - Google Patents
A tunable frequency oscillating wave circuit for power cable partial discharge detector Download PDFInfo
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- CN205374670U CN205374670U CN201620180004.7U CN201620180004U CN205374670U CN 205374670 U CN205374670 U CN 205374670U CN 201620180004 U CN201620180004 U CN 201620180004U CN 205374670 U CN205374670 U CN 205374670U
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Abstract
The utility model provides an adjustable oscillating wave circuit that a tunable frequency oscillating wave circuit for power cable partial discharge detector, it relates to one kind and is used for power cable to detect. The utility model discloses an in order to solve prior art and to carry out partial discharge test to the cable, can't apply the index attenuation oscillasion impulse's of different frequency problem to the test cable of difference appearance value. The utility model discloses testing transformer's input is connected to the voltage regulator, but testing transformer's low voltage output terminal is connected through the silicon stack, protection resistance and the ball control crack that connect gradually to testing transformer's high voltage output end, the back and connecing at the both ends in ball control crack but adjustment inductance, damping resistance and cable sample are established ties, and the data acquisition part connects at the both ends of cable sample, and the input of testing transformer 1 part is connected to the output of data acquisition part. The utility model discloses the index attenuation oscillasion impulse of different frequency can be applyed for the cable sample of different capacitance values, the purpose of carrying out partial discharge detector to different cables is reached.
Description
Technical field
This utility model relates to a kind of adjustable wave of oscillation circuit for power cable detection, is specifically related to a kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection, belongs to power cable detection technique field.
Background technology
Power cable is a kind of important power equipment being applied in power system, because the impact of its climate is little, security reliability is high, hidden durable, do not affect the advantages such as environment and be widely used.Along with putting into operation of a large amount of power cables, corresponding cable fault rate rises also with service life etc., causes power outage and huge economic loss.For ensureing its power supply reliability, to newly-built and laid the operation conditions of cable and health degree to carry out detection particularly important, the particularly nondestructive test of offline inspection at the scene.In power cable, twisted polyethylene cable better receives praises from customers due to its electric property and heat resistance, has become the principal item in middle and high voltage transmission system in recent years.The dendroid that the service life of twisted polyethylene cable is heavily dependent on its dielectric is aging, and is the effective ways of quantitative analysis dendroid degradation to the measurement of shelf depreciation.Causing the initial stage at branch, its partial discharge quantity is about 0.1pC；When branch develops into dielectric breakdown critical state, its partial discharge quantity can reach 1000pC.Therefore, the shelf depreciation of crosslinking polyethylene-insulated cable insulation being detected is find potential faults, prediction service life in time and ensure the important means of power cable safe and reliable operation.
Experiment power supply is had by the on-the-spot non-destructive partial discharge test that cable is carried out offline inspection a lot of requirement: for alternating current power supply, owing to its volume is relatively larger, it has not been convenient to for Partial Discharge Testing on Site；For DC source, owing to crosslinking polyethylene-insulated cable insulation resistance is higher, and AC and DC voltage's distribiuting difference is bigger, after DC experiment, particularly electric cable stoppage place can remaining substantial amounts of space charge in the cable, when the cable rear space electric charge that puts into operation often results in the dielectric breakdown accident of cable, therefore it is not suitable for partial discharge test yet；Intrasonic (0.1Hz) power supply is tested, and need to reduce power, and then require that test period is long, crosslinking polyethylene-insulated cable insulation damage is bigger, it is possible to cause defect new in cable；Exponential damping wave of oscillation power supply is good with alternating current power supply equivalence, there is the shelf depreciation behavior that similarity is high, this power supply is used can effectively to detect cable local discharge, and cable is not damaged by detection itself, utilization index attenuation oscillasion impulse power supply is then answered to carry out the partial discharge test of twisted polyethylene cable.Simultaneously because the capacitance of surveyed object cable is different, cause that the frequency of index of coincidence attenuation oscillasion impulse test equivalence requirement is also different, the hookup using fixed frequency cannot meet the on-the-spot test requirements document of complexity, so designs a kind of hookup for the frequency-adjustable exponential damping wave of oscillation of power cable Partial Discharge Detection and is just particularly important.
Utility model content
The purpose of this utility model be in order to solve prior art partial discharge test is carried out for cable time, the problem that the exponential damping wave of oscillation of different frequency cannot be applied for the test cable of different capacitances.
The technical solution of the utility model is: a kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection, including pressure regulator, testing transformer, silicon stack, protective resistance, controllable impedance, can control ball gap, damping resistance, sample of cable, part of data acquisition and data analysis component, the electrical network input by pressure regulator joint test transformator, the high-voltage output end of the testing transformer silicon stack by being sequentially connected with, the low-voltage output of protective resistance and gap joint test transformator of can controlling ball, described controllable impedance, the two ends of gap of can controlling ball it are attempted by after damping resistance and sample of cable series connection, described part of data acquisition is attempted by the two ends of sample of cable, the outfan of part of data acquisition connects the input of data analysis component.
Described part of data acquisition includes detection components drawn game and puts assembly, detection components drawn game is put group and is connected in parallel, described detection components includes capacitive divider and oscillograph, capacitive divider is attempted by the two ends of sample of cable, oscillograph is attempted by the low-voltage arm electric capacity two ends of capacitive divider, and the input of the outfan connection data analysis component of assembly is put in oscillographic outfan drawn game.
Described office puts assembly and includes coupling electric capacity, detection impedance and Partial discharge detector, the two ends of sample of cable it are attempted by after coupling electric capacity and detection impedance series connection, Partial discharge detector is attempted by the two ends of detection impedance, the outfan of Partial discharge detector connects the input of data analysis component, coupling electric capacity and detection impedance and constitutes PD coupling unit.
Described data analysis component includes computer and data collecting card, and the input of data collecting card is the input of data analysis component, and the outfan of data collecting card connects computer.
Described controllable impedance is air gap adjustable inductance.
Described gap of controlling ball is controlled ignition pill gap.
This utility model compared with prior art has the effect that this utility model is for features in cable local discharge test, the requirement of experiment power supply is different with cable under test capacitance, realize inductance value must be regulated by regulating the size of air gap, by regulating controllable impedance, realize the adjustment of exponential damping oscillating voltage frequency of oscillation, the sample of cable that can give different capacitance applies the exponential damping wave of oscillation of different frequency, and then reaches different cables are carried out the purpose of Partial Discharge Detection.The outfan of testing transformer is connected to protective resistance, it is prevented that occurred stream in loop due to electric discharge；Capacitive divider and PD coupling unit it is parallel with, it is possible to Real-time Collection analytical data after sample of cable.
Accompanying drawing explanation
Fig. 1, circuit diagram of the present utility model；
Fig. 2, artificial circuit figure of the present utility model；
Fig. 3, the simulation waveform of the exponential damping wave of oscillation that this utility model artificial circuit produces, the wherein simulation waveform of Fig. 3 (a) to be adjustable electric inductance value be 2mH exponential damping wave of oscillation produced by artificial circuit；Fig. 3 (b) is adjustable electric inductance value is the simulation waveform of the 1mH exponential damping wave of oscillation produced by artificial circuit；Fig. 3 (c) is adjustable electric inductance value is the simulation waveform of the 0.5mH exponential damping wave of oscillation produced by artificial circuit.
Detailed description of the invention
nullAccompanying drawings detailed description of the invention of the present utility model，A kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection of present embodiment，Including pressure regulator 2、Testing transformer 3、Silicon stack 4、Protective resistance 5、Controllable impedance 7、Can control ball gap 6、Damping resistance 8、Sample of cable 9、Part of data acquisition and data analysis component，The common frequency power network input by pressure regulator 2 joint test transformator 3，The high-voltage output end of testing transformer 3 silicon stack 4 by being sequentially connected with、The low-voltage output of protective resistance 5 and gap 6 joint test transformator 3 of can controlling ball，Described controllable impedance 7、The two ends of gap 6 of can controlling ball it are attempted by after damping resistance 8 and sample of cable 9 series connection，Described part of data acquisition is attempted by the two ends of sample of cable 9，The outfan of part of data acquisition connects the input of data analysis component.
Described part of data acquisition includes detection components drawn game and puts assembly, detection components drawn game is put group and is connected in parallel, described detection components includes capacitive divider and oscillograph 12, capacitive divider is attempted by the two ends of sample of cable 9, oscillograph 12 is attempted by the low-voltage arm electric capacity two ends of capacitive divider, and the input of the outfan connection data analysis component of assembly is put in the outfan drawn game of oscillograph 12.
Described office puts assembly and includes coupling electric capacity 13, detection impedance 14 and Partial discharge detector 15, the two ends of sample of cable 9 it are attempted by after coupling electric capacity 13 and detection impedance 14 series connection, Partial discharge detector 15 is attempted by the two ends of detection impedance 14, the outfan of Partial discharge detector 15 connects the input of data analysis component, coupling electric capacity 13 and detection impedance 14 and constitutes PD coupling unit.
Described data analysis component includes computer 17 and data collecting card 16, and the input of data collecting card 16 is the input of data analysis component, and the outfan of data collecting card 16 connects computer 17.
Described controllable impedance 7 is air gap adjustable inductance.
Described gap 6 of controlling ball is controlled ignition pill gap.
The method that this utility model adopts is, rudimentary knowledge in electrical theory, electric capacity, inductance when series connection and undamped or damping resistance less, by, after switch switching circuit state, constantly carrying out mutual discharge and recharge between electric capacity and inductance and produce the generation of high-frequency sasser at inductively or capacitively two ends after first giving one of them element fully charged.When there being damping resistance, energy is decayed on damping resistance, and capacitor and inductor two ends will form attenuation oscillasion impulse.Second order dynamic circuit equation according to RLC series circuit, if primary capacitance charging voltage is U0, whenShi Huilu produces vibration, and inductive current can be expressed asWhereinFor attenuation quotient,For actual hunting angle frequency,For natural oscillation angular frequency.In cable local discharge measuring circuit, cable is equivalent to an electric capacity, and its capacitance is relatively big, can use as the charging capacitor C in oscillating circuit, and during detection, HVDC source is to the charged rear switch motion of cable, and tested cable and inductance will produce damped oscillation.According to second order dynamic circuit equation known in conjunction with capacitance size and according to meet the shelf depreciation wave of oscillation test equivalence requirement frequency can determine that the size of inductance L in circuit, then determine the size hindering R in circuit further according to the damp condition of the wave of oscillation.By using controllable impedance to realize the frequency-adjustable of exponential damping wave of oscillation circuit, this utility model uses the mode by adjustment air gap to realize the adjustment to inductance.There is inductance value formulaIn formula: L: inductance value (H)；μ0: iron core relative permeability；N: coil turn；S: iron core net sectional area (cm2)；μr: air permeability；L: iron circuit length (cm).Visible when other conditions are constant, changing μ and can change the size of inductance L, changing μ value thus realizing inductance value must be regulated by regulating the size of air gap.
Accompanying drawing 2 is to regulate the vibration of inductance value scalable by the artificial circuit of frequency for 10km cable based on the PSPICE software verification under ORCAD.It is damping resistance that 10km cable capacitance Cs is about 4 μ F, Rs1, and resistance selects 0.7 Ω, and inductance Ls is adjustable.Being that 2kV replaces circuit power supply unit with DC source Vs, Rs is protective resistance, and resistance selects 5k Ω, by TOPEN10ms switch and TCLOSE10.001ms switch in place ignition pill gap.
As seen from Figure 3, the frequency that simulation waveform meets the required exponential damping wave of oscillation and simulation waveform is required consistent with theory, illustrates that circuit of the present utility model is reliably effective.
The build process of this utility model circuit is: takes out the single-phase electricity of 220V from common frequency power network 1 and is connected to the input of pressure regulator 2；The outfan of pressure regulator 2 is connected to the input of testing transformer 3；The two ends of the gap 6 that is connected to control ball after the high-voltage output end concatenation high voltage silicon rectifier stack 4 of testing transformer and protective resistance 5；The two ends of gap of can controlling ball it are connected in parallel to after adjustable for air gap controllable impedance 7, adjustable damping resistance 8 and sample of cable 9 being connected；The capacitive divider being made up of high voltage arm capacitor device 10 and low-voltage arm electric capacity 11 is connected in parallel to the two ends of sample of cable；Oscillograph 12 is connected in parallel on the low-voltage arm electric capacity two ends of capacitive divider；The high-pressure section of the Partial Discharge Measurement System being made up of coupling electric capacity 13, detection impedance 14 is connected in parallel on the two ends of sample of cable；The voltage signal at detection impedance two ends is sent into partial discharge detection instrument 15；Oscillograph drawn game is finally put the signal that detector 15 gathers send into computer 17 by data collecting card 16 and be analyzed processing.
The specific works process of present embodiment is: after switching on power, regulate pressure regulator 2, apply DC voltage can to sample of cable 9, owing to time constant is only small, therefore charging is quickly completed, cable charged rear trigger point fireball gap 6, charging capacitor is through damping resistance 8 inductive discharge, form high-frequency impulse oscillation circuit between adjustable controllable impedance 7 electric discharge of tested cable, adjustable damping resistance 8 and air gap, gather data with potentiometer and PD coupling unit, computer 17 stores and analytical data.The frequency realizing the wave of oscillation for the different adjustable controllable impedance 7 of sample of cable 9 scalable air gap regulates, the function of the frequency-adjustable wave of oscillation of this circuit realiration cable local discharge detection.
Claims (6)
1. the frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection, including pressure regulator, testing transformer, silicon stack, protective resistance, controllable impedance, can control ball gap, damping resistance, sample of cable, part of data acquisition and data analysis component, it is characterized in that: the electrical network input by pressure regulator joint test transformator, the high-voltage output end of the testing transformer silicon stack by being sequentially connected with, the low-voltage output of protective resistance and gap joint test transformator of can controlling ball, described controllable impedance, the two ends of gap of can controlling ball it are attempted by after damping resistance and sample of cable series connection, described part of data acquisition is attempted by the two ends of sample of cable, the outfan of part of data acquisition connects the input of data analysis component.
2. a kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection according to claim 1, it is characterized in that: described part of data acquisition includes detection components drawn game and puts assembly, detection components drawn game is put group and is connected in parallel, described detection components includes capacitive divider and oscillograph, capacitive divider is attempted by the two ends of sample of cable, oscillograph is attempted by the low-voltage arm electric capacity two ends of capacitive divider, and the input of the outfan connection data analysis component of assembly is put in oscillographic outfan drawn game.
3. a kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection according to claim 2, it is characterized in that: described office puts assembly and includes coupling electric capacity, detection impedance and Partial discharge detector, the two ends of sample of cable it are attempted by after coupling electric capacity and detection impedance series connection, Partial discharge detector is attempted by the two ends of detection impedance, and the outfan of Partial discharge detector connects the input of data analysis component.
4. a kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection according to claim 1, it is characterized in that: described data analysis component includes computer and data collecting card, the input of data collecting card is the input of data analysis component, and the outfan of data collecting card connects computer.
5. a kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection according to claim 1, it is characterised in that: described controllable impedance is air gap adjustable inductance.
6. a kind of frequency-adjustable wave of oscillation circuit for power cable Partial Discharge Detection according to claim 1, it is characterised in that: described gap of controlling ball is controlled ignition pill gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620180004.7U CN205374670U (en) | 2016-03-09 | 2016-03-09 | A tunable frequency oscillating wave circuit for power cable partial discharge detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620180004.7U CN205374670U (en) | 2016-03-09 | 2016-03-09 | A tunable frequency oscillating wave circuit for power cable partial discharge detector |
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| CN205374670U true CN205374670U (en) | 2016-07-06 |
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| CN201620180004.7U Expired - Fee Related CN205374670U (en) | 2016-03-09 | 2016-03-09 | A tunable frequency oscillating wave circuit for power cable partial discharge detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884461A (en) * | 2018-11-21 | 2019-06-14 | 广东电网有限责任公司 | Traveling wave generating device |
| CN110376466A (en) * | 2019-07-23 | 2019-10-25 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of damped oscillation wave generation circuit, method and damped oscillation generator |
| CN110879337A (en) * | 2019-11-06 | 2020-03-13 | 广州供电局有限公司 | Oscillating wave voltage generating circuit and cable partial discharge detection device |
| CN110888030A (en) * | 2019-11-26 | 2020-03-17 | 深圳供电局有限公司 | Short air gap discharge identification circuit, method and system of transformer |
| CN112130031A (en) * | 2020-08-11 | 2020-12-25 | 国网天津市电力公司电力科学研究院 | Cable defect identification method based on F-N curve under fixed oscillation cycle frequency |
-
2016
- 2016-03-09 CN CN201620180004.7U patent/CN205374670U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884461A (en) * | 2018-11-21 | 2019-06-14 | 广东电网有限责任公司 | Traveling wave generating device |
| CN110376466A (en) * | 2019-07-23 | 2019-10-25 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of damped oscillation wave generation circuit, method and damped oscillation generator |
| CN110376466B (en) * | 2019-07-23 | 2022-04-19 | 国网内蒙古东部电力有限公司电力科学研究院 | Damping oscillation wave generation circuit and method and damping oscillation generator |
| CN110879337A (en) * | 2019-11-06 | 2020-03-13 | 广州供电局有限公司 | Oscillating wave voltage generating circuit and cable partial discharge detection device |
| CN110888030A (en) * | 2019-11-26 | 2020-03-17 | 深圳供电局有限公司 | Short air gap discharge identification circuit, method and system of transformer |
| CN112130031A (en) * | 2020-08-11 | 2020-12-25 | 国网天津市电力公司电力科学研究院 | Cable defect identification method based on F-N curve under fixed oscillation cycle frequency |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160706 Termination date: 20170309 |
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| CF01 | Termination of patent right due to non-payment of annual fee |