CN105004971B - A kind of cable insulation medium spectrum and state of insulation resistance test method and device - Google Patents
A kind of cable insulation medium spectrum and state of insulation resistance test method and device Download PDFInfo
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Abstract
The invention provides a kind of cable insulation medium spectrum and state of insulation resistance test method and device.It is being detected the exponential waveform voltage of application mechanical periodicity on cable；The Dielectric loss tangent value curve for being detected insulated cable is calculated by waveform voltage and the frequency domain phase relation of electric current in the rising edge or trailing edge of exponential wave；Also include resistance test：Improve and apply voltage class, until reach detected cable highest allow to apply in magnitude of voltage or pressure process find punch-through or it is potential puncture risk, 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；Driving source equipment volume is small；In the absence of charge accumulation effects；It is smaller to cable fault；Driving voltage grade is adjustable；It can be used in detecting the medium spectrum of high voltage distribution cable.
Description
Technical field
The present invention relates to a kind of Electric Power Equipment Insulation medium spectrum and state of insulation resistance test method and device, particularly relate to
And a kind of power cable insulation medium that is applied to is composed 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, be increasingly widely used 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, due to power cable body insulation manufacturing defect, cable and attached
Part construction and installation mass defect and cable accessory workmanship defect cause the phenomenon of cable run operation troubles increasingly serious.By
Underground is embedded in cable, once breaking down, its trouble shoot is extremely difficult, time-consuming, influences the normal operation of power network, cause
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 that other several detection techniques without on the basis of test equipment lightweight and portable in volume is ensured, both
Tan δ change can accurately be reflected, it is even more important that the tan δ values of cable are presented with its water tree degree under ultralow frequency
Good correlation, and both relations are not obvious at higher frequencies.The ultralow frequency examination that can be provided according to U.S.'s Electrical Motor
Test directive/guide, it is adaptable to which the voltage waveform of distribution cable ultralow frequency detection there are four kinds：Cosine square wave, sine wave, bipolarity square wave,
The direct current step wave of other positive-negative polarities change of modulation.Ultralow frequency sine-wave produces or needs the process of modulation and demodulation, right
Filter function requires higher, or using electric rotating machine, bulky, underaction；And cosine square wave is switched during producing
Control strategy it is complicated, it is necessary to which the moment judges capacitive peak.Square wave is tested similar to DC break down voltage, and the 5s that has been only many is once
Commutation process, it is impossible to the normal operating conditions of good equivalent cable, and the direct current step wave modulated need it is more complicated
Industrial digital control technology.
The content of the invention
It is simple the technical problem to be solved in the present invention is to provide a kind of control structure, can test under multi-frequency dielectric loss without
Method obtains medium spectral function, the cable insulation medium spectrum smaller to cable fault and state of insulation resistance test method and dress
Put.
The technical solution adopted by the present invention is as follows：A kind of cable insulation medium spectrum and state of insulation resistance test method, tool
Body method is：It is being detected the exponential waveform voltage of application mechanical periodicity on cable；Lead in the rising edge or trailing edge of exponential wave
The frequency domain phase relation for crossing waveform voltage and electric current calculates the Dielectric loss tangent value curve for being detected insulated cable；
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 is determined by exponential waveform driving source setup parameter with 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 that detected cable highest allows to apply
Found in making alive value or pressure process punch-through or it is potential puncture risk, and record 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 dielectric loss testing result and resistance test result, using recognizing mould
Plan method is estimated to the cable insulation state for being detected insulated cable.
Preferably, the specific method of the Dielectric loss tangent value curve for calculating detected insulated cable is：Will be by
The voltage and current waveform that the sampling of detection insulated cable two ends is obtained carries out signal extraction, extracts the voltage electricity between rising edge signal
Waveform signal is flowed, and Fourier transformation is carried out to it, voltage and current frequency domain amplitude phase waveform is obtained, and then calculate the two
Phase difference δ, it is the Dielectric loss tangent value curve (i.e. medium spectral function) that can obtain being detected insulated cable to calculate tan δ.
A kind of cable insulation medium spectrum 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 is applied to detected insulation
On cable；
Sampling unit is coupled, exponential wave waveform voltage and electric current are gathered in the rising edge or trailing edge of exponential wave；
Medium composes computing module, and the frequency domain phase relation calculating for passing through gathered waveform voltage and electric current is detected insulation
The Dielectric loss tangent value curve of cable；
Preferably, also including：Condition assessment of insulation module, according to dielectric loss testing result and resistance test result,
Using recognize simulation to be detected insulated cable cable insulation state be estimated.
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 by high voltage silicon rectifier stack and waveform 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 output end that cable ground wire is extremely connected；Shearing device of the Master Control Unit and control is connected, in discharge regime cut-out
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 is 0 to 30kV.
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 coupling sampling unit includes current sampling resistor and resitstance voltage divider；The current sample electricity
Resistance one end is connected with the metal screen layer of detected insulated cable, other end ground connection；One end of the resitstance voltage divider is with being detected
The core for surveying insulated cable is connected, other end ground connection.
Preferably, the resitstance voltage divider includes the high-tension resistive barrier resistance and low resistance barrier resistance of series connection,
One end of the high-tension resistive barrier resistance is connected with the core of detected insulated cable.
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 is included 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 Condition assessment of insulation can be carried out to test product cable, with important Practical valency
Value；5th, the frequency domain components that index wave voltage is included are more, by exploring tan δ computational algorithm, can be used in detecting high voltage power distribution
The medium spectrum of cable, this is not available for sine voltage.
Brief description of the drawings
Fig. 1 is the exponential waveform shape schematic diagram that a wherein embodiment of the invention is used.
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 coupling collecting unit 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 cable insulation medium is composed and state of insulation resistance test method, and specific method is：Applied being detected on cable
Plus the exponential waveform voltage of mechanical periodicity；In this specific embodiment, waveform voltage and electric current are passed through in the rising edge of exponential wave
Frequency domain phase relation, calculate be detected insulated cable Dielectric loss tangent value curve；
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 is by exponential waveform driving source (as shown in figure 4, in this specific embodiment, passing through igbt transistor
Switch selection sexual act, is changed to the resistance in incoming exponential waveform voltage drive source, reaches modification α values and then adjusts
Put on the purpose of detected insulated cable two ends exponential wave voltage waveform.) setup parameter and detected cable capacitance capacitance and
Insulaion resistance parameter is determined；t0~t4Constant duration is distributed successively.
Methods described also includes resistance test：Improve and apply voltage class, until reaching that detected cable highest allows to apply
Found in making alive value (3 times of rated voltages) or pressure process punch-through or it is potential puncture risk, and record 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；
According to dielectric loss testing result and resistance test result, using recognizing simulation to being detected the electricity of insulated cable
Cable state of insulation is estimated.
In this specific embodiment, the exponential waveform voltage is 0.1Hz mechanical periodicities, t0~t4Constant duration successively
Distribution, each time interval continues 2.5s, and the voltage waveform cycle is 10s.
Described calculate is detected the specific method of Dielectric loss tangent value curve of insulated cable and is：By detected insulated electro
The voltage and current waveform that the sampling of cable two ends is obtained carries out signal extraction, and it (is t in this specific embodiment to extract rising edge0-t1
And t2-t3Part) voltage current waveform signal between signal, and Fourier transformation is carried out to it, obtain voltage and current frequency domain width
It is worth phase waveform, and then calculates the phase difference δ of the two, it is the Dielectric loss tangent that can obtain being detected insulated cable to calculate tan δ
It is worth curve (i.e. medium spectral function).
It is that waveform parameter α and electricity were preset in the detected insulated cable application that a segment length is x in this specific embodiment
The index wave voltage of grade is pressed, the single-phase voltage waveform of detected insulated cable, current wave are collected by coupling sampling unit
Shape.By data according to t defined above0—t4It is divided into 4 sections, in this specific embodiment, t0-t1And t2-t3It is tested for analyzing
Survey the medium spectral property of insulated cable.To t0-t1And t2-t3Voltage current waveform carry out Fourier transformation respectively, obtain two sections
The frequency-domain waveform of voltage, current waveform in time, asks for the phase difference of two waveforms with frequency f change curve δ (f), then obtain
The curve tan δ (f) that dielectric loss value changes with frequency.
Composed suitable for above cable insulation medium and the cable insulation medium spectrum of state of insulation resistance test method and insulation
State overpressure resistance detecting device, including；
Exponential waveform voltage drive source, for producing the exponential waveform voltage of mechanical periodicity, and is applied to detected insulation
On cable；
Sampling unit is coupled, exponential wave waveform voltage and electric current are gathered in the rising edge or trailing edge of exponential wave；
Medium composes computing module, and the frequency domain phase relation calculating for passing through gathered waveform voltage and electric current is detected insulation
The Dielectric loss tangent value curve of cable.
Also include：Condition assessment of insulation module, according to dielectric loss testing result and resistance test result, using recognizing mould
Plan method is estimated to the cable insulation state for being detected insulated cable.
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 is 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 by high voltage silicon rectifier stack 36 and waveform 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) middle work；Second semiconductor switch module 34 is only in positive discharge loop (t1-t2) with
Reverse charging loop (t2-t3) middle 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 another output end of AC transformer 32；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 (by 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 (by 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 (by 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 is 0 to 30kV.
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 for 15k Ω, power 10W high pressure
Noninductive resistance, high voltage silicon rectifier stack 36,37 is that 30kV is pressure-resistant, through-flow 20A high voltage silicon rectifier stack, and Master Control Unit 39 is to be controlled based on ARM
FPGA control circuit plate, output multi-channel optical electrical signal controls solid-state relay, high-voltage semi-conductor switch and waveform 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 used 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 two ends exponential wave voltage waveform.Semiconductor switch 512,513 ..., 521 only
Selectively turned on when high-voltage semi-conductor switch 35 works, other moment are all off；Semiconductor switch 52,53 ..., 511 only
Selectively turned on when high-voltage semi-conductor switch 34 works, 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, semiconductor is opened
Close 52,53 ..., 511 and 512,513 ..., 521 use the igbt chip IXB40N1000 of ixys companies, and single igbt chip is 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 coupling sampling unit includes current sampling resistor 64 and resitstance voltage divider；The current sample
The one end of resistance 64 is connected with the metal screen layer of detected insulated cable, other end ground connection；One end of the resitstance voltage divider with
The core for being detected insulated cable is connected, other end ground connection.
The resitstance voltage divider includes the high-tension resistive barrier resistance 61 and low resistance barrier resistance 63 of series connection, the height
One end of piezoresistance barrier resistance is connected with the core of detected insulated cable.
In this specific embodiment, current sampling resistor 64 is the accurate noninductive resistance of 10k Ω, 2W, high-tension resistive barrier electricity
Resistance 61 is formed using 3 50M Ω/10W high-pressure glass glaze resistant series, and low resistance barrier resistance 63 is 150 Ω/2W metal films
Resistance.
Low resistance barrier resistance 63 is put into shielding box, reduces spatial electromagnetic interference.
Claims (9)
1. a kind of cable insulation medium is composed and state of insulation resistance test method, specific method is：Apply being detected on cable
The exponential waveform voltage of mechanical periodicity；Closed in the rising edge or trailing edge of exponential wave by waveform voltage and the frequency domain phase of electric current
System calculates the Dielectric loss tangent value curve for being detected insulated cable；
The waveform of the exponential waveform voltage of the mechanical periodicity meets following formula：
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Wherein, U0For the waveform of the exponential waveform voltage of the mechanical periodicity；VinFor default voltage magnitude；α is exponential waveform
Attenuation parameter, its value is determined by exponential waveform driving source setup parameter with 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
Survey cable highest allow to apply in magnitude of voltage or pressure process find punch-through or it is potential puncture risk, and record 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 medium spectrum according to claim 1 and state of insulation resistance test method, methods described also include：
According to dielectric loss testing result and resistance test result, using recognizing simulation to being detected the cable insulation shape of insulated cable
State is estimated.
3. cable insulation medium spectrum according to claim 1 and state of insulation resistance test method, the calculating are detected
The specific method of the Dielectric loss tangent value curve of insulated cable is：By detected insulated cable two ends sample obtained voltage and
Current waveform carries out signal extraction, extracts the voltage current waveform signal between rising edge signal, and carries out Fourier transformation to it,
Voltage and current frequency domain amplitude phase waveform is obtained, and then calculates the phase difference δ of the two, it is that can obtain being detected absolutely to calculate tan δ
The Dielectric loss tangent value curve of edge cable.
4. a kind of cable insulation medium spectrum 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 is applied to detected insulated cable
On；
Sampling unit is coupled, exponential wave waveform voltage and electric current are gathered in the rising edge or trailing edge of exponential wave；
Medium composes computing module, and the frequency domain phase relation calculating for passing through gathered waveform voltage and electric current is detected insulated cable
Dielectric loss tangent value curve；
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 is 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 is 0 to 30kV.
5. cable insulation medium spectrum according to claim 4 and state of insulation overpressure resistance detecting device, it is characterised in that also wrap
Include：Condition assessment of insulation module, according to dielectric loss testing result and resistance test result, using recognizing simulation to being detected
The cable insulation state of insulated cable is estimated.
6. cable insulation medium spectrum according to claim 4 and state of insulation overpressure resistance detecting device, it is characterised in that described
First or second semiconductor switch module includes the electron electric power switch of more than 10 IGBT switch element cascaded structures, each
IGBT switch elements structure includes isolating transformer, IGBT drive circuit, IGTB chips and the buffering protection circuit being sequentially connected；
Master Control Unit is connected with IGBT drive circuit.
7. cable insulation medium spectrum according to claim 4 and state of insulation overpressure resistance detecting device, it is characterised in that described
Waveform adapts to the isolation capacitance that module includes being connected between two inputs or two output ends；It is also defeated including being series at first
Enter more than two IGBT modules between end and the first output end；The IGBT module includes the first igbt transistor and second
Two igbt transistors of igbt transistor and a parameter regulation resistance；The emitter stage of first igbt transistor is connected to ginseng
Number regulation resistance one end, colelctor electrode is connected to the other end of parameter resistance；The colelctor electrode of second igbt transistor is connected to
Described parameter regulation resistance one end, emitter stage is connected to the other end of the parameter resistance；Master Control Unit and all IGBT crystal
The gate pole of pipe is connected, and controls cut-offfing for each igbt transistor.
8. cable insulation medium spectrum according to claim 4 and state of insulation overpressure resistance detecting device, it is characterised in that described
Coupling sampling unit includes current sampling resistor and resitstance voltage divider；Described current sampling resistor one end and detected insulated cable
Metal screen layer be connected, the other end ground connection；One end of the resitstance voltage divider is connected with the core of detected insulated cable, separately
One end is grounded.
9. cable insulation medium spectrum according to claim 8 and state of insulation overpressure resistance detecting device, it is characterised in that described
Resitstance voltage divider includes the high-tension resistive barrier resistance and low resistance barrier resistance of series connection, the high-tension resistive barrier resistance
One end is connected with the core of detected insulated cable.
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| CN107271871B (en) * | 2017-07-21 | 2023-05-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Submarine cable direct-current withstand voltage test charge accumulation dissipation system and test method |
| CN108761205A (en) * | 2018-05-21 | 2018-11-06 | 中国电建集团河南工程有限公司 | Cable through and the test method and tester of insulation |
| CN110007199B (en) * | 2019-02-14 | 2020-05-01 | 重庆大学 | Method and device for determining voltage tolerance index of solid insulating material and intelligent terminal |
| CN111308307A (en) * | 2020-03-13 | 2020-06-19 | 深圳供电局有限公司 | Instantaneous overcurrent capability detection system and method |
| CN113899993B (en) * | 2021-03-04 | 2024-03-26 | 哈尔滨理工大学 | Ultralow frequency cosine square wave withstand voltage test equipment and method for power cable |
| CN113295081B (en) * | 2021-04-15 | 2023-09-22 | 江苏省电力试验研究院有限公司 | Time-frequency domain-based coiled cable length measurement system and method |
| CN113295964B (en) * | 2021-05-21 | 2022-09-06 | 广东电网有限责任公司 | Power supply circuit for cable comprehensive test |
| CN113419147B (en) * | 2021-06-29 | 2022-07-19 | 广西电网有限责任公司电力科学研究院 | Radar spectrum diagram based visualized cable insulation state diagnosis and evaluation method |
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