CN104950231B - Cable insulation shelf depreciation defect and state of insulation resistance test method and device - Google Patents
Cable insulation shelf depreciation defect and state of insulation resistance test method and device Download PDFInfo
- Publication number
- CN104950231B CN104950231B CN201510288191.0A CN201510288191A CN104950231B CN 104950231 B CN104950231 B CN 104950231B CN 201510288191 A CN201510288191 A CN 201510288191A CN 104950231 B CN104950231 B CN 104950231B
- Authority
- CN
- China
- Prior art keywords
- mrow
- msub
- cable
- voltage
- waveform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention provides a kind of cable insulation shelf depreciation defect and state of insulation resistance test method and device.Apply the exponential waveform voltage of mechanical periodicity on cable is detected；Pass through waveform voltage, the local discharge signal of the excitation detected insulated cable in exponential wave trailing edge or rising edge；Record is acquired to local discharge signal, analyzes the local discharge characteristic parameter of shelf depreciation defect；Also include resistance test：Improve and apply voltage class, punch-through or potential breakdown risk are found in magnitude of voltage or pressure process until reaching detected cable highest and allowing to apply, and record the maximum voltage value；The resistance test is repeated as cable life increases, is recorded as cable life increases the pressure-resistant variation tendency occurred and data dispersiveness.Equipment volume is small, lighter；In the absence of charge accumulation effects；It is smaller to cable fault；Driving voltage grade is adjustable；The shelf depreciation information that test product can directly be gathered carries out partial discharge location and pattern-recognition.
Description
Technical field
It is special the present invention relates to a kind of Electric Power Equipment Insulation shelf depreciation defect and state of insulation resistance test method and device
It is not to be related to one kind to be applied to power cable insulation shelf depreciation defect and state of insulation resistance test method and device.
Background technology
In recent years, in order to improve urban environment, the safe and reliable operation of power network is ensured, distribution cable just progressively substitutes tradition
Overhead line, it is more and more extensive to be applied in distribution network construction.Enter however as the industry technology of China's cables manufacturing in recent years
Step and city transmission and distribution network largely use underground power cable, because power cable body insulate manufacturing defect, cable and attached
Part construction and installation mass defect and cable accessory workmanship defect cause the phenomenon getting worse of cable run operation troubles.By
Underground is embedded in cable, once breaking down, its trouble shoot is extremely difficult, time-consuming, influences the normal operation of power network, causes
Larger economic loss, the daily production of daily life, production division to resident and the photograph of other social nonproductive departments
Often operating causes inconvenience.
A large amount of different types of cable insulation state inspections are there has been both at home and abroad.Compare as can be seen that ultralow frequency
Voltage detecting technology has the advantages of other several detection techniques do not have, on the basis of test equipment lightweight and portable in volume is ensured, energy
The local discharge signal of cable test product is sufficiently inspired, therefore, ultralow frequency detection technique is on cable water branch ageing management
More there is very big advantage.The ultralow frequency test guidance that can be provided according to U.S.'s Electrical Motor, examined suitable for distribution cable ultralow frequency
The voltage waveform of survey has four kinds：Cosine square wave, sine wave, bipolarity square wave, the direct current of other positive-negative polarities change of modulation
Step wave.Ultralow frequency sine-wave produces or needs the process of modulation and demodulation, requires higher to filter function, otherwise use rotation
Motor, bulky, underaction；And the control strategy that cosine square wave switchs during producing is complicated, it is necessary to which the moment judges electricity
Hold peak value.Square wave is tested similar to DC break down voltage, the commutation processes of 5s once that have been only more, can not equivalent cable well
Normal operating conditions, and the direct current step wave modulated needs more complicated industrial digital control technology.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of control structure is simple, the cable insulation smaller to cable fault
Shelf depreciation defect and state of insulation resistance test method and device.
The technical solution adopted by the present invention is as follows：A kind of cable insulation method for diagnosing status, specific method are：It is being detected
Apply the exponential waveform voltage of mechanical periodicity on cable；In exponential wave trailing edge or rising edge by the exponential wave high voltage,
Encourage the local discharge signal of the detected insulated cable；Record is acquired to local discharge signal, analyzes shelf depreciation
The local discharge characteristic parameter of defect；
The waveform of the exponential waveform voltage of the mechanical periodicity meets following formula：
Wherein, U0For the waveform of the exponential waveform voltage of the mechanical periodicity；VinFor default voltage magnitude；α is index
Waveform attenuating parameter, its value are determined by exponential waveform driving source setup parameter and detected cable capacitance capacitance and insulaion resistance parameter
It is fixed；t0~t4Constant duration is distributed successively；
Methods described also includes resistance test：Improve and apply voltage class, until reaching detected cable highest allows to apply
Punch-through or potential breakdown risk are found in making alive value or pressure process, and records the maximum voltage value；With the cable longevity
Life, which increases, repeats the resistance test, records as cable life increases the pressure-resistant variation tendency occurred and data dispersiveness.
Preferably, methods described also includes：According to shelf depreciation defects detection result and resistance test result, knowledge is utilized
Other simulation is assessed the cable insulation state for being detected insulated cable.
Preferably, the local discharge characteristic parameter includes amplitude, phase and the repetitive rate parameter of partial discharge pulse.
Preferably, the specific method of the local discharge characteristic parameter of analysis shelf depreciation defect is：Extract driving voltage
Waveform trailing edge part, record start and end time, the collection of partial discharge pulse's collection terminal is a series of between these moment
The discharge voltage pulse signal that amplitude does not wait, sets the threshold value stepped up, every time filters off pulse below threshold value, then with fixation
Time window splits pulse train, and incident pulse and reflected impulse are carried out according to known velocity of wave and detected insulated cable length
Matching, and then the distance at the time difference calculating Partial Discharge Sources distance samples end seen according to pairing pulse, are positioned, while right
The amplitude of incident pulse and recorded with the phase relation of excitation voltage waveform, it is final to obtain the part for being detected insulated cable
Discharge characteristic spectrogram and positioning spectrogram.
A kind of cable insulation shelf depreciation defect and state of insulation overpressure resistance detecting device, it is characterised in that including；
Exponential waveform voltage drive source, for producing the exponential waveform voltage of mechanical periodicity, and it is applied to detected insulation
On cable；
Shelf depreciation defect acquisition module, with couple collecting unit on the contrary, exponential wave trailing edge or rising edge, adopt
Collect the local discharge signal of the detected insulated cable；
Local discharge characteristic Parameter analysis module, pass through the local discharge signal of collection, the office of analysis shelf depreciation defect
Portion's discharge characteristic parameter；
Preferably, also include Condition assessment of insulation module, according to shelf depreciation defects detection result and resistance test knot
Fruit, using identify simulation to be detected insulated cable cable insulation state assess.
Adapted to preferably, the exponential waveform voltage drive source includes AC transformer, semiconductor switch module, waveform
Module and Master Control Unit；Two inputs of the AC transformer are connected by primary side shearing device with AC power；Institute
Two output ends of transformer are stated, one end is connected by protective resistance with semiconductor switch module, other end ground connection；It is described partly to lead
Body switch module adapts to module with waveform by high voltage silicon rectifier stack and is connected；The semiconductor switch module includes the first semiconductor switch
Module and the second semiconductor switch module；First semiconductor switch module is only in positive charge loop and back discharge loop
Middle work；Second semiconductor switch module in reverse charging loop only in positive discharge loop with working；The waveform is fitted
Module is answered to include, the first input end being connected with high voltage silicon rectifier stack and the second input being connected with another output end of AC transformer
End；The waveform adapt to module also include the first output end for being connected with detected insulated cable core and with detected insulated electro
The second extremely connected output end of cable ground wire；Shearing device of the Master Control Unit and control is connected, and is cut off in discharge regime
Power supply, while short-circuit transformer primary side；The Master Control Unit is connected with the first and second semiconductor switch modules, is applied to adjust
The frequency for the exponential voltage being added on detected insulated cable；The Master Control Unit adapts to module with waveform and is connected, and is applied to adjust
The waveform shape for the exponential voltage being added on detected insulated cable；
The output voltage of the AC transformer arrives 30kV for 0.
Preferably, the described first or second semiconductor switch module includes more than 10 IGBT switch element cascaded structures
Electron electric power switch, each IGBT switch elements structure includes the isolating transformer, IGBT drive circuit, the IGTB that are sequentially connected
Chip and buffering protection circuit；Master Control Unit is connected with IGBT drive circuit.
Preferably, the waveform adapts to the isolation electricity that module includes being connected between two inputs or two output ends
Hold；Also include series connection and more than two IGBT modules between first input end and the first output end；The IGBT module bag
Include two igbt transistors of the first igbt transistor and the second igbt transistor and a parameter regulation resistance；First IGBT
The emitter stage of transistor is connected to parameter regulation resistance one end, and colelctor electrode is connected to the other end of parameter resistance；Described second
The colelctor electrode of igbt transistor is connected to described parameter regulation resistance one end, and emitter stage is connected to the another of the parameter resistance
End；Master Control Unit is connected with the gate pole of all igbt transistors, controls cut-offfing for each igbt transistor.
Preferably, the shelf depreciation defect acquisition module includes coupled capacitor and coupling resistance, in addition to it is described
Coupling resistance overvoltage protection diode in parallel；One end of the coupled capacitor is connected with the core of detected insulated cable, separately
One end is connected with one end of coupling resistance；The other end ground connection of the coupling resistance.
Compared with prior art, the beneficial effects of the invention are as follows：1st, using exponential waveform voltage drive, detection device volume
It is small, it is lighter；Driving source equipment volume is small, and the functional unit quantity that test loop includes is few, passes through structure reasonable in design
Electronic power switch can also further reduce volume, reduce weight；2nd, there is voltage commutation in exponential waveform alternating voltage, not deposit
In charge accumulation effects；3rd, exponential wave voltage commutation process is slower than cosine square wave, faster than sine wave, is a kind of to cable fault
Smaller detection voltage；4th, with detected insulated cable difference adaptations can occur for excitation sources waveform shape, encourage
Voltage class is adjustable, fully, comprehensively can carry out Condition assessment of insulation to test product cable, have important Practical valency
Value；5th, the shelf depreciation information that can directly gather test product carries out partial discharge location and pattern-recognition.
Brief description of the drawings
Fig. 1 is the exponential waveform shape schematic diagram that a wherein embodiment of the invention uses.
Fig. 2 is the exponential waveform voltage drive source structure schematic diagram of a wherein embodiment of the invention.
Fig. 3 is the semiconductor switch module structural representation of a wherein embodiment of the invention.
Fig. 4 is that the waveform of a wherein embodiment of the invention adapts to modular structure schematic diagram.
Fig. 5 is the shelf depreciation defect acquisition module structure chart signal of a wherein embodiment of the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Any feature disclosed in this specification (including summary and accompanying drawing), unless specifically stated otherwise, can be equivalent by other
Or the alternative features with similar purpose are replaced.I.e., unless specifically stated otherwise, each feature is a series of equivalent or class
Like an example in feature.
A kind of insulated local discharge defect and state of insulation resistance test method, specific method are：On cable is detected
Apply the exponential waveform voltage of mechanical periodicity；In this specific embodiment, in exponential wave trailing edge by waveform voltage, institute is encouraged
State the shelf depreciation flaw indication of detected insulated cable；Record is acquired to local discharge defect signal, analysis is local to put
The local discharge characteristic parameter of electric defect；
As shown in figure 1, the waveform of the exponential waveform voltage of the mechanical periodicity meets following formula：
Wherein, U0For the waveform of the exponential waveform voltage of the mechanical periodicity；VinFor default voltage magnitude；α is index
Waveform attenuating parameter, its value (as shown in figure 4, in this specific embodiment, pass through igbt transistor by exponential waveform driving source
Switch selection sexual act, is changed to the resistance for being passed to exponential waveform voltage drive source, reaches modification α values and then adjusts
Put on the purpose of detected insulated cable both ends exponential wave voltage waveform.) setup parameter and detected cable capacitance capacitance and
Insulaion resistance parameter determines；t0~t4Constant duration is distributed successively.
Methods described also includes resistance test：Improve and apply voltage class, until reaching detected cable highest allows to apply
Punch-through or potential breakdown risk are found in making alive value (3 times of rated voltages) or pressure process, and records the ceiling voltage
Value；The resistance test is repeated as cable life increases, is recorded as cable life increases the pressure-resistant variation tendency occurred and number
According to dispersiveness.
Methods described also includes：According to shelf depreciation defects detection result and resistance test result, using identifying simulation
The cable insulation state for being detected insulated cable is assessed.
In this specific embodiment, the exponential waveform voltage is 0.1Hz mechanical periodicities, t0~t4Constant duration successively
Distribution, each time interval continue 2.5s, and the voltage waveform cycle is 10s.
The local discharge characteristic parameter includes amplitude, phase and the repetitive rate parameter of partial discharge pulse.
The specific method of local discharge characteristic parameter for analyzing shelf depreciation defect is：Extract excitation voltage waveform trailing edge
(it is t in this specific embodiment1-t2And t3-t4) part, record start and end time, the shelf depreciation between these moment
Pulse collection end gathers a series of discharge voltage pulse signal that amplitudes do not wait, and the threshold value stepped up is set, every time by threshold value
Following pulse filters off, then splits pulse train with set time window, is entered according to known velocity of wave and detected insulated cable length
Row incident pulse and the matching of reflected impulse, and then the time difference calculating Partial Discharge Sources distance samples end seen according to pairing pulse
Distance, positioned, while amplitude to incident pulse and recorded with the phase relation of excitation voltage waveform, finally obtained
The local discharge characteristic spectrogram and positioning spectrogram of insulated cable must be detected.
In this specific embodiment, the detected insulated cable for being x for a segment length, which applies, preset waveform parameter α and electricity
The index wave voltage of grade is pressed, the shelf depreciation ripple of detected insulated cable is collected by shelf depreciation defect acquisition module
Shape.By data according to t defined above0—t4It is divided into 4 sections, in this specific embodiment, to t1-t2And t3-t4Shelf depreciation
Waveform carries out Pulse pairing, then calculates the time delay Δ t of each pair pulse, then partial discharge position distance is detected insulated cable
The distance of sampling end is Δ x=x-0.5*v Δs t.Meanwhile electric discharge amplitude to each pair partial discharge pulse and with voltage waveform
Phase corresponding relation is got ready, can obtain local discharge characteristic spectrogram and local breakdown location spectrogram.
Locally put suitable for the cable insulation of above cable insulation shelf depreciation defect and state of insulation resistance test method
Electric defect and state of insulation overpressure resistance detecting device, including；
Exponential waveform voltage drive source, for producing the exponential waveform voltage of mechanical periodicity, and it is applied to detected insulation
On cable；
Shelf depreciation defect acquisition module, with couple collecting unit on the contrary, exponential wave trailing edge or rising edge, adopt
Collect the local discharge signal of the detected insulated cable；
Local discharge characteristic Parameter analysis module, pass through the local discharge signal of collection, the office of analysis shelf depreciation defect
Portion's discharge characteristic parameter；
Condition assessment of insulation module, according to dielectric loss testing result, shelf depreciation defects detection result and resistance test
As a result, using identify simulation to be detected insulated cable cable insulation state assess.
As shown in Fig. 2 it (is boosting in this specific implementation that the exponential waveform voltage drive source, which includes AC transformer 32,
Transformer), semiconductor switch module, waveform adapt to module 38 and Master Control Unit 39；Two inputs of the AC transformer 32
End (once holding) is connected by primary side shearing device 31 with AC power (being mains supply in this specific embodiment)；It is described
Two output ends of transformer, one end are connected by protective resistance 33 with semiconductor switch module, other end ground connection；It is described partly to lead
Body switch module adapts to module with waveform by high voltage silicon rectifier stack 36 and is connected；The semiconductor switch module is opened including the first semiconductor
Close the semiconductor switch module 35 of module 34 and second；First semiconductor switch module 35 is only in positive charge loop (t0-t1)
With back discharge loop (t3-t4) in work；Second semiconductor switch module 34 is only in positive discharge loop (t1-t2) with
Reverse charging loop (t2-t3) in work；The waveform, which adapts to module 38, to be included, the first input end being connected with high voltage silicon rectifier stack 36
The second input being connected with 32 another output end of AC transformer；The waveform, which adapts to module, also to be included and detected insulation
The first connected output end of cable core and the second output end being extremely connected with detected insulated cable ground wire；The master control list
Shearing device of first 39 (passing through optical fiber) and control is connected, and is cut off the electricity supply in discharge regime, while short-circuit transformer primary side；
The Master Control Unit (passing through optical fiber) is connected with the first and second semiconductor switch modules, and detected insulated electro is put on to adjust
The frequency of exponential voltage on cable；The Master Control Unit (passing through optical fiber) and waveform adapt to module and are connected, come adjust put on by
Detect the waveform shape of the exponential voltage on insulated cable；
The output voltage of the AC transformer arrives 30kV for 0.
In this specific embodiment, primary side shearing device 31 uses 10A solid-state relays；Step-up transformer 32 is 220V
Input, 30kV outputs, power 500W HT testing transformers；Protective resistance 33 uses resistance as 15k Ω, power 10W high pressure
Noninductive resistance, high voltage silicon rectifier stack 36,37 are that 30kV is pressure-resistant, through-flow 20A high voltage silicon rectifier stack, and Master Control Unit 39 is based on ARM controls
FPGA control circuit plate, output multi-channel optical electrical signal, solid-state relay, high-voltage semi-conductor switch and waveform is controlled to adapt to respectively
Module.
In this specific embodiment, both described first and second semiconductor switch modules have identical structure, such as Fig. 3
Shown, the electron electric power that the described first or second semiconductor switch module includes more than 10 IGBT switch element cascaded structures is opened
Close, isolating transformer, IGBT drive circuit, IGTB chips and the buffering that each IGBT switch elements structure includes being sequentially connected are protected
Protection circuit；Master Control Unit is connected with IGBT drive circuit transmits control signal.In this specific embodiment, civil power is as power supply electricity
Pressure is connected with the input of isolating transformer, and isolating transformer uses 100W, isolation voltage 30kV high voltage isolating transformer.
The waveform adapts to the isolation capacitance 51 that module includes being connected between two inputs or two output ends；Also wrap
Include series connection and more than two IGBT modules between first input end and the first output end；The IGBT module includes first
Two igbt transistors of igbt transistor and the second igbt transistor and a parameter regulation resistance；First igbt transistor
Emitter stage be connected to parameter regulation resistance one end, colelctor electrode is connected to the other end of parameter resistance；The 2nd IGBT crystal
The colelctor electrode of pipe is connected to described parameter regulation resistance one end, and emitter stage is connected to the other end of the parameter resistance；Master control list
First gate pole with all igbt transistors is connected, and controls cut-offfing for each igbt transistor.In this specific embodiment, pass through half
The resistance that the selection sexual act of conductor switch seals in exponential waveform driving source to module 38 is changed (short-circuit resistance), reaches
To modification U0Middle α values and then the purpose for adjusting test product both ends exponential wave voltage waveform.Semiconductor switch 512,513 ..., 521 only
Selectively turned in high-voltage semi-conductor 35 work of switch, other moment are all off；Semiconductor switch 52,53 ..., 511 only
Selectively turned in high-voltage semi-conductor 34 work of switch, other moment are all off.
As shown in figure 4, in this specific embodiment, electric capacity 51 uses 500nF/30kV higfh-tension ceramics electric capacity, and semiconductor is opened
Pass 52,53 ..., the igbt chip IXB40N1000 of 511 and 512,513 ..., 521 use ixys companies, single igbt chip are resistance to
Press 3kV, through-flow 40A；Resistance 522,523 ..., 531 use 1.5M Ω, power 30W resistant series.
As shown in figure 5, the shelf depreciation defect acquisition module includes coupled capacitor 62 and coupling resistance 65, in addition to
The coupling resistance 65 overvoltage protection diode 66 in parallel；One end of the coupled capacitor 62 and the line of detected insulated cable
Core is connected, and the other end is connected with one end of coupling resistance 65；The other end ground connection of the coupling resistance 65.
In this specific embodiment, coupling resistance 65 and overvoltage protection diode 66 are put into shielding box jointly, are reduced empty
Between electromagnetic interference.The coupling resistance uses noninductive resistance, improves the sensitivity of local discharge signal collection.
Claims (9)
1. a kind of cable insulation shelf depreciation defect and state of insulation resistance test method, specific method are：In detected cable
The upper exponential waveform voltage for applying mechanical periodicity；Pass through the exponential waveform voltage, excitation in exponential wave trailing edge or rising edge
The local discharge signal of the detected insulated cable；Record is acquired to local discharge signal, analyzes shelf depreciation defect
Local discharge characteristic parameter；
The waveform of the exponential waveform voltage of the mechanical periodicity meets following formula：
<mrow>
<msub>
<mi>U</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>&alpha;</mi>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</msup>
<mo>)</mo>
</mrow>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>t</mi>
<mn>0</mn>
</msub>
<mo>&le;</mo>
<mi>t</mi>
<mo>&le;</mo>
<msub>
<mi>t</mi>
<mn>1</mn>
</msub>
<mo>;</mo>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>&alpha;</mi>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>1</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</msup>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>t</mi>
<mn>1</mn>
</msub>
<mo>&le;</mo>
<mi>t</mi>
<mo>&le;</mo>
<msub>
<mi>t</mi>
<mn>2</mn>
</msub>
<mo>;</mo>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>&alpha;</mi>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>2</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</msup>
<mo>)</mo>
</mrow>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>t</mi>
<mn>2</mn>
</msub>
<mo>&le;</mo>
<mi>t</mi>
<mo>&le;</mo>
<msub>
<mi>t</mi>
<mn>3</mn>
</msub>
<mo>;</mo>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>&alpha;</mi>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>3</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</msup>
<mo>.</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>t</mi>
<mn>3</mn>
</msub>
<mo>&le;</mo>
<mi>t</mi>
<mo>&le;</mo>
<msub>
<mi>t</mi>
<mn>4</mn>
</msub>
<mo>;</mo>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
Wherein, U0For the waveform of the exponential waveform voltage of the mechanical periodicity；VinFor default voltage magnitude；A is exponential waveform
Attenuation parameter, its value are determined by exponential waveform driving source setup parameter and detected cable capacitance capacitance and insulaion resistance parameter；
t0~t4Constant duration is distributed successively；Methods described also includes resistance test：Improve and apply voltage class, until reaching tested
Surveying cable highest allows to apply discovery punch-through or potential breakdown risk in magnitude of voltage or pressure process, and records highest electricity
Pressure value；With cable life increase repeat the resistance test, record with cable life increase occur pressure-resistant variation tendency with
Data dispersiveness.
2. cable insulation shelf depreciation defect according to claim 1 and state of insulation resistance test method, methods described
Also include：According to shelf depreciation defects detection result and resistance test result, using identifying simulation to being detected insulated cable
Cable insulation state assessed.
3. cable insulation shelf depreciation defect according to claim 1 and state of insulation resistance test method, the part
Discharge characteristic parameter includes amplitude, phase and the repetitive rate parameter of partial discharge pulse.
4. cable insulation shelf depreciation defect according to claim 1 and state of insulation resistance test method, analysis is local
The specific method of the local discharge characteristic parameter of discharge defect is：Extract excitation voltage waveform trailing edge part, record start with
End time, partial discharge pulse's collection terminal gathers a series of discharge voltage pulse letter that amplitudes do not wait between these moment
Number, the threshold value stepped up is set, every time filtered off pulse below threshold value, then pulse train is split with set time window, according to
Known velocity of wave and detected insulated cable length carry out incident pulse and the matching of reflected impulse, and then according between pairing pulse
Time difference calculate the distance at Partial Discharge Sources distance samples ends, positioned, at the same amplitude to incident pulse and with excitation
The phase relation of voltage waveform is recorded, and the final local discharge characteristic spectrogram for obtaining detected insulated cable and positioning are composed
Figure.
5. a kind of cable insulation shelf depreciation defect and state of insulation overpressure resistance detecting device, it is characterised in that including；
Exponential waveform voltage drive source, for producing the exponential waveform voltage of mechanical periodicity, and it is applied to detected insulated cable
On；
Shelf depreciation defect acquisition module, in the trailing edge or rising edge of exponential wave, the office of the collection detected insulated cable
Portion's discharge signal；
Local discharge characteristic Parameter analysis module, by the local discharge signal of collection, the part of analysis shelf depreciation defect is put
Electrical feature parameter；
The exponential waveform voltage drive source includes AC transformer, semiconductor switch module, waveform and adapts to module and master control list
Member；Two inputs of the AC transformer are connected by primary side shearing device with AC power；The two of the transformer
Individual output end, one end are connected by protective resistance with semiconductor switch module, other end ground connection；The semiconductor switch module leads to
High voltage silicon rectifier stack is crossed with waveform adaptation module to be connected；The semiconductor switch module includes the first semiconductor switch module and the second half
Conductor switch module；First semiconductor switch module in back discharge loop only in positive charge loop with working；It is described
Second semiconductor switch module in reverse charging loop only in positive discharge loop with working；The waveform, which adapts to module, to be included,
The first input end being connected with high voltage silicon rectifier stack and the second input being connected with another output end of AC transformer；The waveform is fitted
Answer module also include the first output end for being connected with detected insulated cable core and with detected insulated cable ground wire pole phase
The second output end even；Shearing device of the Master Control Unit and control is connected, and is cut off the electricity supply in discharge regime, while short circuit
Transformer primary side；The Master Control Unit is connected with the first and second semiconductor switch modules, is detected absolutely to adjust to put on
The frequency of exponential voltage on edge cable；The Master Control Unit adapts to module with waveform and is connected, and is detected absolutely to adjust to put on
The waveform shape of exponential voltage on edge cable；
The output voltage of the AC transformer arrives 30kV for 0.
6. cable insulation shelf depreciation defect according to claim 5 and state of insulation overpressure resistance detecting device, its feature exist
In, in addition to Condition assessment of insulation module, according to shelf depreciation defects detection result and resistance test result, simulated using identification
Method is assessed the cable insulation state for being detected insulated cable.
7. cable insulation shelf depreciation defect according to claim 5 and state of insulation overpressure resistance detecting device, its feature exist
In the electron electric power that the described first or second semiconductor switch module includes more than 10 IGBT switch element cascaded structures is opened
Close, isolating transformer, IGBT drive circuit, IGTB chips and the buffering that each IGBT switch elements structure includes being sequentially connected are protected
Protection circuit；Master Control Unit is connected with IGBT drive circuit.
8. cable insulation shelf depreciation defect according to claim 5 and state of insulation overpressure resistance detecting device, its feature exist
In the waveform adapts to the isolation capacitance that module includes being connected between two inputs or two output ends；Also include series connection
More than two IGBT modules between first input end and the first output end；The IGBT module includes the first IGBT crystal
Pipe and two igbt transistors of the second igbt transistor and a parameter regulation resistance；The emitter stage of first igbt transistor
Parameter regulation resistance one end is connected to, colelctor electrode is connected to the other end of parameter resistance；The current collection of second igbt transistor
Pole is connected to described parameter regulation resistance one end, and emitter stage is connected to the other end of the parameter resistance；Master Control Unit is with owning
The gate pole of igbt transistor is connected, and controls cut-offfing for each igbt transistor.
9. cable insulation shelf depreciation defect according to claim 5 and state of insulation overpressure resistance detecting device, its feature exist
In the shelf depreciation defect acquisition module includes coupled capacitor and coupling resistance, in addition in parallel with the coupling resistance
Overvoltage protection diode；One end of the coupled capacitor is connected with the core of detected insulated cable, the other end and coupling resistance
One end be connected；The other end ground connection of the coupling resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510288191.0A CN104950231B (en) | 2015-05-29 | 2015-05-29 | Cable insulation shelf depreciation defect and state of insulation resistance test method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510288191.0A CN104950231B (en) | 2015-05-29 | 2015-05-29 | Cable insulation shelf depreciation defect and state of insulation resistance test method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104950231A CN104950231A (en) | 2015-09-30 |
| CN104950231B true CN104950231B (en) | 2018-01-23 |
Family
ID=54165032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510288191.0A Active CN104950231B (en) | 2015-05-29 | 2015-05-29 | Cable insulation shelf depreciation defect and state of insulation resistance test method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104950231B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646146B (en) * | 2016-09-22 | 2019-08-23 | 国网江苏省电力公司电力科学研究院 | A method of it calculating unloaded high voltage power cable highest and bears voltage location |
| CN108061837A (en) * | 2017-12-31 | 2018-05-22 | 上海南洋-藤仓电缆有限公司 | A kind of elevator cable is horizontal to accelerate bending life test equipment and test method |
| CN109100621B (en) * | 2018-06-21 | 2021-02-26 | 南方电网科学研究院有限责任公司 | Burn simulation test method and structure between outer semi-conducting layer of cable and aluminum sheath |
| CN108896885A (en) * | 2018-07-11 | 2018-11-27 | 云南电网有限责任公司电力科学研究院 | A kind of distribution transformer shelf depreciation and over-voltage monitoring equipment |
| 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 |
| CN112034309B (en) * | 2020-07-28 | 2021-11-23 | 北京交通大学 | Partial discharge identification method for high-voltage switch cabinet |
| CN113608077B (en) * | 2021-06-29 | 2023-06-02 | 深圳供电局有限公司 | Power transmission line test system |
| CN115808603B (en) * | 2023-02-16 | 2023-09-22 | 江苏盛华电气有限公司 | High-voltage cable withstand voltage test system and method |
| CN117147972B (en) * | 2023-10-31 | 2024-03-26 | 国网天津市电力公司电力科学研究院 | Cable testing method and device, electronic equipment and medium |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2657025B2 (en) * | 1992-03-30 | 1997-09-24 | 東京電力株式会社 | A method for measuring the partial discharge of live lines in power cable lines. |
| CN201373905Y (en) * | 2009-03-04 | 2009-12-30 | 厦门红相电力设备股份有限公司 | Safety detecting evaluation system of power cable |
| CN102981106B (en) * | 2012-11-12 | 2015-05-06 | 华北电力大学 | Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge |
| CN204028288U (en) * | 2014-08-08 | 2014-12-17 | 国家电网公司 | The checkout equipment of cable local discharge and capacitive coupled sensors |
-
2015
- 2015-05-29 CN CN201510288191.0A patent/CN104950231B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104950231A (en) | 2015-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104950231B (en) | Cable insulation shelf depreciation defect and state of insulation resistance test method and device | |
| CN104965152B (en) | A kind of cable insulation method for diagnosing status and diagnostic device | |
| CN104965161B (en) | A kind of cable insulation medium spectrum and shelf depreciation defect inspection method and device | |
| CN105004971B (en) | A kind of cable insulation medium spectrum and state of insulation resistance test method and device | |
| CN204789663U (en) | Exponential waveform high voltage generator is used in insulating diagnosis of distribution cable | |
| CN106990341A (en) | Distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator and method | |
| CN105044564B (en) | A kind of cable insulation medium spectrum detection method and device | |
| CN104965160B (en) | A kind of cable local discharge detection method and detection means | |
| CN103018575B (en) | A kind of method utilizing large power, electrically sensing electricity testing device to measure high-power inductance | |
| CN101304210B (en) | Method and circuit for diagnosing Boost convertor electromagnetic interference mechanism | |
| CN104280644B (en) | Direct-current transmission project typical transient fault recognizing method | |
| CN102890226B (en) | XLPE (Cross Linked Polyethylene) cable water tree aging state testing system of power system | |
| CN101592701A (en) | Direct-current voltage withstanding test method for multilevel zinc oxide lightning arresters | |
| CN103762884B (en) | The grounded source transmitter of three ring Parallel Control and control method | |
| CN103944607A (en) | Low voltage power line carrier communication signal detection device | |
| CN104297568A (en) | Insulation resistance detection device and method for double-winding motor | |
| CN206038827U (en) | A testing arrangement for local incipient discharge voltage of inverter motor interturn insulation | |
| CN203056700U (en) | Electricity-taking apparatus of high-voltage power transmission line | |
| CN207051428U (en) | Distribution cable insulation diagnosis ultralow frequency cosine square wave high pressure generator | |
| CN104965159B (en) | A kind of cable insulation state resistance test method and detection device | |
| CN102967805A (en) | Analysis meter and analysis method for online induction pulse signal of electric transmission line | |
| CN103018573B (en) | Field measurement system for dielectric loss value of crosslinked polyethylene power cable | |
| CN206892187U (en) | A kind of AC harmonic source | |
| CN109358239A (en) | A kind of phase matched circuit for the test of ac cable space charge | |
| CN2722265Y (en) | DC grounding on-line tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |