CN106990341A - Distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator and method - Google Patents
Distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator and method Download PDFInfo
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- CN106990341A CN106990341A CN201710385643.6A CN201710385643A CN106990341A CN 106990341 A CN106990341 A CN 106990341A CN 201710385643 A CN201710385643 A CN 201710385643A CN 106990341 A CN106990341 A CN 106990341A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a kind of distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator and method.The device is made up of positive-negative polarity high voltage direct current potential source, bidirectional high-pressure electronic power switch, polar converter and Master Control Unit, can apply the ultralow frequency cosine square wave high voltage that peak value is 30kV 0.1Hz mechanical periodicities to the maximum on test product cable.Waveform be in both positive and negative polarity stable state when can analog DC high voltage to cable carry out DC break down voltage experiment, it can obtain the leakage current of test product, the centrality defect of effecting reaction test product, and 50Hz ac high voltages can be then simulated in rising edge and trailing edge ac test is carried out to cable, test product dielectric loss angle tangent and local discharge defect are detected, so as to obtain comprehensive assessment to the state of insulation of test product cable.By Master Control Unit control high-tension electricity electronic switch alternating break-make cable is charged, using polar converter to cable discharge with realize polarity of voltage conversion.Ultralow frequency cosine square-wave generator of the present invention combines DC testing of cables technology and industrial frequency AC experimental technique, Comprehensive assessment can be carried out to cable insulation state, drastically increase test efficiency, reduce cost, with important engineering practical value, industry level is improved.
Description
【Technical field】
The present invention relates to the state of insulation detection technique field of power equipment, it is ultralow to be that one kind is specifically applied to power cable
The device of frequency state of insulation detection.
【Background technology】
Distribution cable is as the main artery of operation of power networks, and the production and living of its security reliability and people are closely bound up.By
Underground is embedded in cable, once breaking down, its trouble shoot is extremely difficult, time-consuming, causes larger economic loss, to occupying
The operating as usual of the daily life of the people, the daily production of production division and other social nonproductive departments causes inconvenience.
DC break down voltage experiment, industrial frequency AC pressure test, power frequency are mainly included to the state of insulation detection of cable in engineering
Resonance Voltage Withstand Test and Ultra-low frequency voltage endurance test etc..When carrying out DC break down voltage experiment to cable, it can usually be let out by cable
The change of leakage current has relatively effective reaction to the state of insulation especially centrality defect of cable, but right under DC break down voltage
The test of cable insulation is lower close to operation physical condition not as exchange, and for XLPE cable, the electricity after DC break down voltage experiment
There can be remaining space charge in cable, so that unnecessary causing electric field distortion to cause under industrial frequency AC after putting into operation
Accident.Although industrial frequency AC pressure test more practically reflects the state of insulation of cable, because power cables capacitance is larger,
It is required that the Capacity Ratio of ac test equipment is larger, volume is heavy, it has not been convenient to Site Detection.Ultra-low Frenquency Voltage detection technique is in distribution
There is unique advantage in Cable Insulation Diagnosis Technology, on the basis of test equipment lightweight and portable in volume is ensured, can fully swash
The local discharge signal of cable test product is sent, tan δ change can accurately be reflected again, it is even more important that be electric under ultralow frequency
Good correlation is presented with its water tree cladodification degree in the tan δ values of cable, and both relations are not obvious at higher frequencies.
However, at present there are various not enough and defects in existing Ultra-low Frenquency Voltage waveform, ultralow frequency sine-wave produce or need to modulate and
The process of demodulation, requires higher to filter function, or using electric rotating machine, bulky, underaction；And cosine square wave by
In wave characteristics itself, existing DC voltage characteristic, there is exchange feature again, wherein square wave part is tried similar to DC break down voltage
Test, and dipole inversion process is similar to cosine wave, can simulate the pressure test under industrial frequency AC, take into account the two advantage.Therefore, exist
It has evaluated system complexity, after many factors such as test effect of test waveform, the present invention proposes to use ultralow frequency cosine
The Ultra-low Frenquency Voltage of square-wave waveform carries out the method that the state of insulation of distribution cable is detected, and have developed exciting bank, fully
Solve problem described above, improve relevant industries technical merit.
【The content of the invention】
The invention provides a kind of distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator and method, solve
Current power distribution cable insulation state diagnostic apparatus is heavy, and voltage class is limited, the problems such as detection defect is not comprehensive.
The present invention uses following technical scheme：
A kind of distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator, including positive polarity HVDC source A,
Negative polarity HVDC source B, bidirectional high-pressure electronic power switch C, polar converter D, Master Control Unit E, and lc circuit, its
In, bidirectional high-pressure electronic power switch C and polar converter D are connected in parallel, and bidirectional high-pressure electronic power switch C is by the first He
Second controllable type high-tension electricity electronic switch unit is constituted；The input of the positive polarity HVDC source A is civil power, is output as the
The input of one controllable type high-tension electricity electronic switch unit；The input of the negative polarity HVDC source B is civil power, is output as the
The input of two controllable type high-tension electricity electronic switch units；Connected after one end series inductance of the polar converter D outputs
In one end of electric capacity, the other end of polar converter D outputs is connected to the other end of electric capacity, and the electric capacity is connected in parallel on test product electricity
The two ends of cable, during detection, apply the ultralow frequency cosine square wave that peak value is 30kV 0.1Hz mechanical periodicities to the maximum on test product cable
High voltage, the alternating break-make for controlling high-tension electricity electronic switch by Master Control Unit carries out forward and reverse charging to cable, utilizes pole
Property conversion equipment to cable discharge with realize polarity of voltage change.
Described positive polarity HVDC source A is identical with negative polarity HVDC source B structure, main by relay, rises
Pressure transformer, protective resistance, high-voltage capacitance, the first high voltage silicon rectifier stack, current-limiting resistance composition voltage doubling rectifing circuit.
Described polar converter D is by the third and fourth controllable type high-tension electricity electronic switch and the second high voltage silicon rectifier stack
With the 3rd high voltage silicon rectifier stack constitute, wherein, the 3rd controllable type high-tension electricity electronic switch connected with the second high voltage silicon rectifier stack after with connecting
The 4th controllable type high-tension electricity electronic switch be connected in parallel with the 3rd high voltage silicon rectifier stack, the inductance connection is high in the 4th controllable type
The emitter stage of piezoelectric forces electronic switch.
First to fourth described controllable type high-tension electricity electronic switch is mainly that multiple block coupled in series are formed, each module
Respectively by high voltage isolating transformer, IGBT driving plates, IGBT module and corresponding buffer protection circuit connected in series are constituted, high_voltage isolation
The input of transformer is exchanged with 220V to be connected, and IGBT driving plate transmits control signal by optical fiber.
High voltage isolating transformer uses 100W, isolation voltage 30kV high voltage isolating transformer.
The relay maximum cut-out 40A electric currents；Step-up transformer inputs for 220V, 15kV outputs, power 500W high pressures
Testing transformer；Protective resistance uses resistance for 2M Ω high-pressure glass glaze resistance, the numerical value 5000pF/40kV of high-voltage capacitance,
First high voltage silicon rectifier stack is pressure-resistant 40kV, and through-flow 5A silicon stack, current-limiting resistance is resistance 5M Ω high-pressure glass glaze resistance.
Second and the 3rd high voltage silicon rectifier stack be 40kV it is pressure-resistant, through-flow 5A high voltage silicon rectifier stack；Inductance uses 1H, and electric capacity is 0.1 μ f.
A kind of distribution cable isolation diagnostic method, applies peak value on test product cable and is 30kV 0.1Hz cycles to the maximum and become
The ultralow frequency cosine square wave high voltage of change, when waveform is in the square wave stage, analog DC high voltage carries out DC break down voltage to cable
Experiment, obtains the leakage current of test product, the centrality defect of effecting reaction test product；When waveform is in rising edge and trailing edge,
Simulate 50Hz ac high voltages and ac test, detection test product dielectric loss angle tangent and local discharge defect carried out to cable,
So as to obtain comprehensive assessment to the state of insulation of test product cable.
The high-tension waveform frequency of ultralow frequency cosine square wave applied on test product cable is 0.1Hz, and a cycle can divide
For Four processes, voltage waveform is respectively：
Wherein, UOFor cosine square-wave waveform driving source output voltage waveforms, VmFor default electric capacity charging voltage amplitude,
t0—t1Moment voltage is in positive polarity, and the time is 5s, t2—t3Moment electric capacity is changed into negative pole by polar converter voltage
Property, the time is 5s；And t1—t2Moment is the positive discharge process of electric capacity, and capacitance voltage waveform is by just to bearing, and transfer process is approximately
Cosine form, the time is in 2-6ms, t3—t4Moment is electric capacity back discharge process, and polarity of voltage is by bearing just, slope waveform
It is approximately cosine waveform, the time is in 2-6ms.
t0-t1Stage, the first controllable type high-tension electricity electronic switch unit (7) conducting, electric capacity is in positive charge process；
t2-t3Stage, the second controllable type high-tension electricity electronic switch unit (8) conducting, electric capacity is in reverse charging process,
Now analog DC pressure test, for analyzing the leakage current of test product cable, reflects cable centrality defect；
t1-t2The 4th controllable type high-tension electricity electronic switch (10) is turned in stage, polar converter, and electric capacity is in just
To discharge process；
t3-t4The 3rd controllable type high-tension electricity electronic switch (9) is turned in stage, polar converter, and electric capacity is in reverse
Discharge process, for analyzing the medium spectral property and Characteristics of Partial Discharge of test product；
By to t1-t2Stage and t3-t4The voltage current waveform in stage carries out Fourier transformation respectively, obtains medium damage
The curve tan δ (f) that consumption tangent value changes with frequency；To t1-t2Stage and t3-t4The Partial Discharge in stage enters horizontal pulse and matched somebody with somebody
It is right, local discharge characteristic spectrogram and local breakdown location spectrogram are obtained, the experimental data of acquisition is finally subjected to net assessment, it is comprehensive
Close property to test product cable carry out insulation condition diagnosis work.
Compared with prior art, the present invention at least has the advantages that：High pressure generator of the present invention is main by positive and negative
Polarity high voltage direct current potential source, bidirectional high-pressure electronic power switch, polar converter and Master Control Unit are constituted.In test product cable
It is upper to apply the ultralow frequency cosine square wave high voltage that peak value is 30kV 0.1Hz mechanical periodicities to the maximum.When waveform is steady in both positive and negative polarity
Analog DC high voltage carries out DC break down voltage experiment to cable (when i.e. waveform is in the square wave stage) when determining state, obtains test product
Leakage current, the centrality defect of effecting reaction test product, and 50Hz ac high voltages pair are then simulated in rising edge and trailing edge
Cable carries out ac test, detection test product dielectric loss angle tangent and local discharge defect, so that the insulation to test product cable
State obtains comprehensive assessment.The alternating break-make of high-tension electricity electronic switch is controlled to carry out cable by Master Control Unit positive and negative
To charging, using polar converter to cable discharge to realize that polarity of voltage is changed.Ultralow frequency cosine square wave of the present invention occurs
Device combines DC testing of cables technology and industrial frequency AC experimental technique, can carry out Comprehensive to cable insulation state
Assess, drastically increase test efficiency, reduce cost, with important engineering practical value, improve industry level.
【Brief description of the drawings】
Above-mentioned is only the general introduction of the present invention program, in order to better understand the technological means of the present invention, below in conjunction with
The present invention is described in further detail for the drawings and specific embodiments.
Fig. 1 is a kind of circuit structure diagram of distribution cable insulation diagnosis cosine square wave high pressure generator of the invention.
The cosine square-wave waveform that Fig. 2 uses for a kind of distribution cable insulation diagnosis cosine square wave high pressure generator of the invention
Schematic shapes.
Fig. 3 is that a kind of distribution cable insulation diagnosis cosine square-wave waveform high pressure generator positive-negative polarity of the invention is converted
Waveform during journey.
Fig. 4 is that the high-voltage semi-conductor that a kind of distribution cable insulation diagnosis of the invention is used with cosine square wave high pressure generator is opened
The structural representation of pass.
【Embodiment】
The invention discloses a kind of distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator.The device is by just
Negative polarity high voltage direct current potential source, bidirectional high-pressure electronic power switch, polar converter and Master Control Unit are constituted, can be in test product
Apply the ultralow frequency cosine square wave high voltage that peak value is 30kV 0.1Hz mechanical periodicities to the maximum on cable.Waveform is in both positive and negative polarity
During stable state when square wave stage (waveform be in) can analog DC high voltage DC break down voltage experiment is carried out to cable, can obtain
The leakage current of test product, the centrality defect of effecting reaction test product, and 50Hz can be then simulated when rising edge is with trailing edge and is exchanged
High voltage carries out ac test, detection test product dielectric loss angle tangent and local discharge defect to cable, so as to test product electricity
The state of insulation of cable obtains comprehensive assessment.The alternating break-make of high-tension electricity electronic switch is controlled to cable by Master Control Unit
Carry out forward and reverse charging, using polar converter to cable discharge with realize polarity of voltage change.Ultralow frequency cosine of the present invention
Square-wave generator combines DC testing of cables technology and industrial frequency AC experimental technique, cable insulation state can be carried out complete
Face comprehensive eye exam, drastically increases test efficiency, reduces cost, with important engineering practical value, improves row
Industry level.
Specifically, wherein positive polarity HVDC source A is by relay 1, step-up transformer 2, protective resistance 3, high-tension electricity
Hold 4, high voltage silicon rectifier stack 5, the voltage doubling rectifing circuit that current-limiting resistance 6 is constituted is constituted；Negative polarity HVDC source B is by relay 1, boosting
Transformer 2, protective resistance 3, high-voltage capacitance 4, high voltage silicon rectifier stack 5, the voltage doubling rectifing circuit that current-limiting resistance 6 is constituted is constituted；C is by two groups
Controllable type high-tension electricity electronic switch unit 7,8 is constituted；D is polar converter, by two groups of controllable type high-tension electricity electronic cuttings
Close 9,10 and the composition of high voltage silicon rectifier stack 11,12；E is Master Control Unit；Other generator is also made up of inductance 13 and high-voltage capacitance 14.
As shown in figure 1, the relay 1 of the cosine square wave high pressure generator uses Omron G7Z-4A, maximum is cut-off
40A electric currents；Step-up transformer 2 inputs for 220V, 15kV outputs, power 500W HT testing transformers；Protective resistance 3 is using resistance
It is worth the high-pressure glass glaze resistance for 2M Ω, high-voltage capacitance 4 uses numerical value 5000pF/40kV, and high voltage silicon rectifier stack 5 is pressure-resistant 40kV, is led to
5A silicon stack is flowed, the resistance of current-limiting resistance 6 is 5M Ω high-pressure glass glaze resistance；High-voltage semi-conductor switch module 7,8 uses module
Change design structure；High-voltage semi-conductor switch 9,10 in polar converter equally uses modularized design structure, high voltage silicon rectifier stack
11,12 be that 40kV is pressure-resistant, through-flow 5A high voltage silicon rectifier stack；Inductance uses 1H, and electric capacity 14 is 0.1 μ f；Top control module E is to be based on ARM
The FPGA control circuit plate of control, output multi-channel optical electrical signal, control relay, high-voltage semi-conductor switch and polarity turn respectively
Changing device.
As shown in figure 4, the high-voltage semi-conductor switchs the block coupled in series of 7,8,9,10 predominantly 10 slightly lower voltage class
Form, each module is respectively by high voltage isolating transformer, IGBT driving plates, IGBT module and corresponding buffer protection circuit structure
Into.The input of high voltage isolating transformer is exchanged with 220V to be connected, and IGBT driving plate transmits control signal by optical fiber.It is preferred that
, high voltage isolating transformer uses 100W, isolation voltage 30kV high voltage isolating transformer.Selected fiber optic emitter is
IFBR1522, fiber optic receiver is IFBR2522.
The waveform frequency is 0.1Hz, and a cycle can be divided into Four processes, in moment t0-t1, t1-t2, t2-
Voltage waveform is respectively between t3, t3-t4：
Wherein UOFor cosine square-wave waveform driving source output voltage waveforms, VmFor default electric capacity charging voltage amplitude, t0-
T1 moment voltage is in positive polarity, and the time is 5s, and t2-t3 moment electric capacity is changed into negative polarity by polar converter voltage, when
Between be 5s；And t1-t2 moment is the positive discharge process of electric capacity, capacitance voltage waveform is by just to bearing, transfer process is approximately cosine
Form, the time, similarly, t3-t4 moment was electric capacity back discharge process, and polarity of voltage is by bearing just, slope ripple in 2-6ms
Shape is also approximately at cosine waveform, and the time is in 2-6ms.The voltage waveform cycle is 10s.T0~t4 is defined in the specification accompanying drawing 2.
Switch 7 only works in positive charge loop (t0-t1), and switch 8 only works at reverse charging loop (t2-t3),
Switch 10 only works in positive discharge loop (t1-t2), and switch 9 only works at back discharge loop (t3-t4).Unit two are total to
Four groups of switches have identical structure, and concrete structure forms for the block coupled in series of 10 slightly lower voltage class, each module difference
By high voltage isolating transformer, IGBT driving plates, IGBT module and corresponding buffer protection circuit are constituted.High voltage isolating transformer
Input is connected with 220V electric mains, and IGBT driving plate transmits control signal by optical fiber.
Cosine square-wave waveform of the present invention is used to apply the cosine square wave of predetermined waveform parameter for one section of test product cable
High voltage ripple, can collect test product cable single-phase voltage waveform, current waveform, Partial Discharge by detection device.(t0-
T1) stage high pressure semiconductor switch 7 is turned on, and electric capacity is in positive charge process, and (t2-t3) stage high pressure semiconductor switch 8 is led
Logical, electric capacity is in reverse charging process, and now analog DC pressure test can be used to analyze the leakage current of test product cable, instead
Reflect cable centrality defect；(t1-t2) stage, polar converter mesohigh semiconductor switch 10 is turned on, and electric capacity is in forward direction
Discharge process, (t3-t4) stage polar converter mesohigh semiconductor switch 9 is turned on, and electric capacity is in back discharge process, this
Two kinds of processes are similar to cosine wave form, can be used to analyze the medium spectral property and Characteristics of Partial Discharge of test product.Additionally by right
(t1-t2) and the voltage current waveform of (t3-t4) carries out Fourier transformation respectively, obtain Dielectric loss tangent value and change with frequency
Curve tan δ (f)；Pulse pairing is carried out to (t1-t2) and (t3-t4) Partial Discharge, local discharge characteristic is can obtain
Spectrogram and local breakdown location spectrogram.
The experimental data of acquisition is finally subjected to net assessment, it is comprehensive that insulation condition diagnosis work is carried out to test product cable
Make.
It is described above, only it is presently preferred embodiments of the present invention, any formal limitation not is made to the present invention,
Those skilled in the art make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all fall within this
In the protection domain of invention.
Claims (10)
1. a kind of distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator, it is characterised in that：It is high including positive polarity
Press DC source (A), negative polarity HVDC source (B), bidirectional high-pressure electronic power switch (C), polar converter (D), master control
Unit (E), and lc circuit, wherein, bidirectional high-pressure electronic power switch (C) and polar converter (D) are connected in parallel, two-way
High-tension electricity electronic switch (C) is made up of the first and second controllable type high-tension electricity electronic switch units (7,8)；The positive polarity
The input in HVDC source (A) is civil power, is output as the input of the first controllable type high-tension electricity electronic switch unit (7)；It is described
The input in negative polarity HVDC source (B) is civil power, is output as the defeated of the second controllable type high-tension electricity electronic switch unit (8)
Enter；One end of electric capacity is connected to after one end series inductance of polar converter (D) output, polar converter (D) is defeated
The other end gone out is connected to the other end of electric capacity, and the electric capacity is connected in parallel on the two ends of test product cable, during detection, on test product cable
Apply the ultralow frequency cosine square wave high voltage that peak value is 30kV 0.1Hz mechanical periodicities to the maximum, high pressure is controlled by Master Control Unit
The alternating break-make of electronic power switch carries out forward and reverse charging to cable, using polar converter to cable discharge to realize electricity
Press dipole inversion.
2. a kind of distribution cable insulation diagnosis according to claim 1 ultralow frequency cosine square wave high pressure generator, it is special
Levy and be：Described positive polarity HVDC source (A) is identical with negative polarity HVDC source (B) structure, main by relay
(1), step-up transformer (2), protective resistance (3), high-voltage capacitance (4), the first high voltage silicon rectifier stack (5), current-limiting resistance (6) composition multiplication of voltage
Rectification circuit.
3. a kind of distribution cable insulation diagnosis according to claim 1 ultralow frequency cosine square wave high pressure generator, it is special
Levy and be：Described polar converter (D) is by the third and fourth controllable type high-tension electricity electronic switch (9,10) and second
High voltage silicon rectifier stack (11) and the 3rd high voltage silicon rectifier stack (12) are constituted, wherein, the 3rd controllable type high-tension electricity electronic switch (9) and second high
Press in parallel with the 3rd high voltage silicon rectifier stack (12) with the 4th controllable type high-tension electricity electronic switch (10) connected after silicon stack (11) series connection
Connection, emitter stage of the inductance connection in the 4th controllable type high-tension electricity electronic switch (10).
4. a kind of distribution cable insulation diagnosis according to claim 1 ultralow frequency cosine square wave high pressure generator, it is special
Levy and be：First to fourth described controllable type high-tension electricity electronic switch is mainly that multiple block coupled in series are formed, each module
Respectively by high voltage isolating transformer, IGBT driving plates, IGBT module and corresponding buffer protection circuit connected in series are constituted, high_voltage isolation
The input of transformer is exchanged with 220V to be connected, and IGBT driving plate transmits control signal by optical fiber.
5. a kind of distribution cable insulation diagnosis according to claim 4 ultralow frequency cosine square wave high pressure generator, it is special
Levy and be：High voltage isolating transformer uses 100W, isolation voltage 30kV high voltage isolating transformer.
6. a kind of distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure according to any one of claim 2 to 5
Generator, it is characterised in that：The relay maximum cut-out 40A electric currents；Step-up transformer (2) inputs for 220V, 15kV outputs,
Power 500W HT testing transformers；Protective resistance (3) uses resistance for 2M Ω high-pressure glass glaze resistance, high-voltage capacitance (4)
Numerical value 5000pF/40kV, the first high voltage silicon rectifier stack (5) be pressure-resistant 40kV, through-flow 5A silicon stack, current-limiting resistance (6) be resistance 5M
Ω high-pressure glass glaze resistance.
7. a kind of distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure according to any one of claim 2 to 5
Generator, it is characterised in that：Second and the 3rd high voltage silicon rectifier stack (11,12) be 40kV it is pressure-resistant, through-flow 5A high voltage silicon rectifier stack；Inductance
(13) 1H is used, electric capacity (14) is 0.1 μ f.
8. a kind of distribution cable isolation diagnostic method, the diagnostic method is matched somebody with somebody based on one kind any one of claim 1 to 7
Electrical cables insulation diagnosis ultralow frequency cosine square wave high pressure generator, it is characterised in that：Apply peak value on test product cable maximum
For the ultralow frequency cosine square wave high voltage of 30kV 0.1Hz mechanical periodicities, the high electricity of analog DC when waveform is in the square wave stage
Pressure carries out DC break down voltage experiment to cable, obtains the leakage current of test product, the centrality defect of effecting reaction test product；At waveform
When rising edge and trailing edge, simulation 50Hz ac high voltages carry out ac test to cable, and detection test product dielectric loss angle is just
Value and local discharge defect are cut, so as to obtain comprehensive assessment to the state of insulation of test product cable.
9. a kind of distribution cable isolation diagnostic method according to claim 8, it is characterised in that：Apply on test product cable
The high-tension waveform frequency of ultralow frequency cosine square wave be 0.1Hz, a cycle can be divided into Four processes, voltage waveform difference
For：
Wherein, UOFor cosine square-wave waveform driving source output voltage waveforms, VmFor default electric capacity charging voltage amplitude, t0—t1When
Carve voltage and be in positive polarity, the time is 5s, t2—t3Moment electric capacity is changed into negative polarity by polar converter voltage, and the time is
5s；And t1—t2Moment is the positive discharge process of electric capacity, capacitance voltage waveform by just to bearing, transfer process is approximately cosine form,
Time is in 2-6ms, t3—t4Moment is electric capacity back discharge process, and polarity of voltage is by bearing just, and slope waveform is also approximately at cosine
Waveform, the time is in 2-6ms.
10. a kind of distribution cable isolation diagnostic method according to claim 9, it is characterised in that：
t0-t1Stage, the first controllable type high-tension electricity electronic switch unit (7) conducting, electric capacity is in positive charge process；
t2-t3Stage, the second controllable type high-tension electricity electronic switch unit (8) conducting, electric capacity is in reverse charging process, now
Analog DC pressure test, for analyzing the leakage current of test product cable, reflects cable centrality defect；
t1-t2The 4th controllable type high-tension electricity electronic switch (10) is turned in stage, polar converter, and electric capacity is put in forward direction
Electric process；
t3-t4The 3rd controllable type high-tension electricity electronic switch (9) is turned in stage, polar converter, and electric capacity is in back discharge
Process, for analyzing the medium spectral property and Characteristics of Partial Discharge of test product；
By to t1-t2Stage and t3-t4The voltage current waveform in stage carries out Fourier transformation respectively, obtains Dielectric loss tangent
The curve tan δ (f) that value changes with frequency；To t1-t2Stage and t3-t4The Partial Discharge in stage carries out Pulse pairing, obtains
To local discharge characteristic spectrogram and local breakdown location spectrogram, the experimental data of acquisition is finally subjected to net assessment, it is comprehensive
To test product cable carry out insulation condition diagnosis work.
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| CN201710385643.6A CN106990341B (en) | 2017-05-26 | 2017-05-26 | Ultralow-frequency cosine square wave high-voltage generator and method for insulation diagnosis of distribution cable |
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| CN201710385643.6A CN106990341B (en) | 2017-05-26 | 2017-05-26 | Ultralow-frequency cosine square wave high-voltage generator and method for insulation diagnosis of distribution cable |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761298A (en) * | 2018-09-05 | 2018-11-06 | 国网河北省电力有限公司电力科学研究院 | Distribution cable Insulation monitoring test method |
| CN109283445A (en) * | 2018-10-24 | 2019-01-29 | 中车株洲电力机车有限公司 | A kind of insulation detecting method and controller of energy storage type rail vehicle charging system |
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| CN113899993A (en) * | 2021-03-04 | 2022-01-07 | 哈尔滨理工大学 | Ultralow-frequency cosine square wave voltage withstand test equipment and method for power cable |
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| CN112243499A (en) * | 2018-06-08 | 2021-01-19 | 西门子股份公司 | Method for measuring partial discharges in an electric drive system |
| CN112243499B (en) * | 2018-06-08 | 2023-10-20 | 西门子股份公司 | Method for measuring partial discharge in an electric drive system |
| CN108761298A (en) * | 2018-09-05 | 2018-11-06 | 国网河北省电力有限公司电力科学研究院 | Distribution cable Insulation monitoring test method |
| CN109283445B (en) * | 2018-10-24 | 2021-05-11 | 中车株洲电力机车有限公司 | Insulation detection method and controller of energy storage type rail vehicle charging system |
| CN109283445A (en) * | 2018-10-24 | 2019-01-29 | 中车株洲电力机车有限公司 | A kind of insulation detecting method and controller of energy storage type rail vehicle charging system |
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| CN113075508A (en) * | 2021-03-29 | 2021-07-06 | 云南电网有限责任公司曲靖麒麟供电局 | Ultralow frequency high voltage test equipment |
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| CN113447779A (en) * | 2021-07-15 | 2021-09-28 | 桂林电力电容器有限责任公司 | Direct-current support capacitor aging accelerated tolerance test circuit and test method |
| CN113740613B (en) * | 2021-07-23 | 2023-08-25 | 深圳供电局有限公司 | Device and method for testing dielectric loss of power transmission cable |
| CN113740613A (en) * | 2021-07-23 | 2021-12-03 | 深圳供电局有限公司 | Device and method for testing dielectric loss of power transmission cable |
| CN114545165B (en) * | 2022-02-21 | 2023-05-09 | 青岛艾测科技有限公司 | Special high-voltage insulation detection device for capacitive load |
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