CN106950477A - A kind of built-in very high frequency(VHF) partial discharge detection device and method - Google Patents
A kind of built-in very high frequency(VHF) partial discharge detection device and method Download PDFInfo
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- CN106950477A CN106950477A CN201710225612.4A CN201710225612A CN106950477A CN 106950477 A CN106950477 A CN 106950477A CN 201710225612 A CN201710225612 A CN 201710225612A CN 106950477 A CN106950477 A CN 106950477A
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- 238000001514 detection method Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 27
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910052802 copper Inorganic materials 0.000 claims abstract description 64
- 239000010949 copper Substances 0.000 claims abstract description 64
- 238000012545 processing Methods 0.000 claims abstract description 37
- 238000009434 installation Methods 0.000 claims abstract description 14
- 238000012625 in-situ measurement Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 9
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 238000011897 real-time detection Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 description 6
- 238000003672 processing method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The present invention relates to a kind of built-in very high frequency(VHF) partial discharge detection device and method, built-in very high frequency(VHF) partial discharge detection device includes very high frequency(VHF) current transformer, signal acquisition module, signal processing module.Technical scheme is by optimizing HFCT for very high frequency(VHF) VHFCT.Current Transmit ring installation site is optimized, Current Transmit ring is arranged on inside cable connector.The copper mesh being wrapped in outside semi-conductive layer is connected with cable armouring earth cable again directly through Current Transmit ring.Occurs point In situ Measurement in Partial discharge signal, it is ensured that the very high frequency(VHF) characteristic of partial discharge so that cable partial discharge Detection accuracy is greatly improved.
Description
Technical field
The present invention relates to High-Voltage Technology field, and in particular to a kind of built-in very high frequency(VHF)（VHF）Partial discharge detection device and
Method.
Background technology
The shelf depreciation problem of High Voltage XLPE Power Cable is the principal element for causing high-tension cable accident, is constantly subjected to for many years
Extensive concern.To find out its cause, mainly due to the insulating element existing defects of cable, producing local micro electric discharge.And the electric discharge
Process accelerates the deterioration of XLPE cable insulating properties, ultimately results in cable breakdown.The early stage shelf depreciation for how measuring cable shows
As significant to prevention cable fault.On the other hand, because the electric field stress of intermediate joint of electric cable more collects
In, it is the weak link of power cable insulation, it is easier to produce insulation fault.According to statistics, most cable insulation, which punctures, asks
Joint area between topic generation in the cable.Therefore, the shelf depreciation status monitoring of cable connector is to improve cable running safety
Emphasis.
Traditional cable local discharge detection method has pulse current method, wave of oscillation method of testing, high frequency electric method etc..Such as public affairs
The number of opening discloses a kind of cable local discharge detection device for CN103852697A Chinese invention patent, and the device includes swinging ripple
Module, signal acquisition module and analysis and Control module occur for voltage, and oscillating wave voltage occurs module generation oscillating wave voltage and will
Oscillating wave voltage is put on cable under test, and cable under test is under oscillating wave voltage effect, and shelf depreciation position produces pulse electricity
Signal is flowed, signal acquisition module gathers the pulsed current signal, generates gathered data, send gathered data to analysis and Control mould
Block, analysis and Control module is analyzed gathered data according to built-in Analysis of Partial Discharge software, obtains cable under test local
Discharge examination result.But, pulse current method and wave of oscillation method of testing are only used for the safety inspection in the case of cable off-line, nothing
Method is used for the on-line monitoring of cable connector.The large-scale shelf depreciation inspection in the suitable scene of high frequency electric method, but this method
Easily disturbed by external signal, it is difficult to for monitoring in real time.
Publication No. CN203490332U Chinese utility model patent discloses a kind of intelligent partial discharge of Multifunctional hand-held
Detection means, it includes High Frequency Current Sensor (HFCT）, superfrequency current sensor (UHFCT), ultrasonic sensor（AE）、
Handheld main machine, High Frequency Current Sensor (HFCT）Electric signal output, superfrequency current sensor (UHFCT) electric signal it is defeated
Go out, ultrasonic sensor（AE）Electric signal output be connected respectively with the input of the electric signal of handheld main machine；The detection method makes
Ultra-high frequency wireless electromagnetic wave is received with UHFCT, then by hyperfrequency envelope detection circuit, down conversion process is carried out, obtains
High-frequency signal；The effect of envelope detection circuit is the envelope of the local peaking's voltage, i.e. signal that obtain input signal, and removes defeated
Enter the high frequency carrier component in signal, obtain signal low frequency component；The UHF signals that shelf depreciation is produced are similar with amplitude-modulated signal,
High frequent carrier frequency is 300MHz~3GHz, and its envelope is indicial response, and UHF signal durations are 50~500ns, are approximately recognized
It is 2~20MHz for the frequency range of the low frequency component of amplitude-modulated signal, UHF signals are changed into high frequency letter after envelope detection circuit
Number pulsed electromagnetic signal that can be detected with HFCT is changed into data signal after same signal pre-processing circuit through A/D.The dress
Put the problem of existing：CT rings can not support the so high-frequency signal acquisitions of 300MHz~3GHz；The device is not fixedly mounted, only
Signal acquisition testing is carried out by inspection, this portable detecting device can not realize that real time on-line monitoring and cable fault are carried in time
Wake up.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of built-in very high frequency(VHF)（VHF）Partial discharge detection device and
Method, built-in very high frequency(VHF)（VHF）Partial discharge detection device includes very high frequency(VHF) current transformer, signal acquisition module, signal transacting
Module, technical scheme optimizes Current Transmit ring installation site by optimizing HFCT for very high frequency(VHF) VHFCT,
Current Transmit ring is arranged on inside cable connector, by the copper mesh being wrapped in outside semi-conductive layer directly through current transformer
CT rings are connected with cable armouring earth cable again, occur point In situ Measurement in Partial discharge signal, it is ensured that the very high frequency(VHF) characteristic of partial discharge,
So that cable partial discharge Detection accuracy is greatly improved.
To achieve these goals, the present invention is adopted the following technical scheme that.
The invention discloses a kind of built-in very high frequency(VHF) partial discharge detection device, at cable connector, the device includes
Very high frequency(VHF) current transformer, signal acquisition module, signal processing module；The very high frequency(VHF) current transformer and signal acquisition module
Inside cable connector copper shell, cable connector copper mesh layers and cable armouring junction, cable connector copper mesh layers are through very high
Frequency current transformer.
Preferably, the very high frequency(VHF) current transformer is the very high frequency(VHF) current transformer of nickel-zinc ferrite material.
In any of the above-described technical scheme preferably, the very high frequency(VHF) current transformer is based on Rogowski coil
The very high frequency(VHF) current transformer of mode.
In any of the above-described technical scheme preferably, the frequency response of the very high frequency(VHF) current transformer is arrived for 10M
50M。
In any of the above-described technical scheme preferably, the very high frequency(VHF) current transformer is arranged in cable connector copper shell
Portion, is placed in cable connector copper mesh layers and cable armouring junction.
In any of the above-described technical scheme preferably, the very high frequency(VHF) current transformer is arranged in cable connector copper shell
The cable connector copper mesh layers in portion and cable armouring junction, cable connector copper mesh layers pass through very high frequency(VHF) current transformer.
In any of the above-described technical scheme preferably, the cable connector copper mesh layers are passed through after very high frequency(VHF) current transformer
It is connected again with cable armouring earth cable.
In any of the above-described technical scheme preferably, the sample rate of the signal acquisition module for 100M and more than.
In any of the above-described technical scheme preferably, the signal processing module is FPGA module.
In any of the above-described technical scheme preferably, the signal processing module is one-chip computer module.
In any of the above-described technical scheme preferably, the one-chip computer module uses arm processor or DSP Processor.
The invention also discloses a kind of built-in very high frequency(VHF) partial discharge detection method, using built-in described in as above any one
Very high frequency(VHF) partial discharge detection device carries out the real-time detection of cable connector Partial discharge signal.
In any of the above-described technical scheme preferably, built-in very high frequency(VHF) partial discharge detection method includes：
Built-in very high frequency(VHF) partial discharge detection device includes being arranged on the very high frequency(VHF) current transformer and letter inside cable connector copper shell
Number acquisition module, and the signal processing module being placed in outside cable connector copper shell, very high frequency(VHF) current transformer and signal acquisition
Module is connected by signal wire with signal processing module；
Very high frequency(VHF) current transformer is arranged on cable connector copper mesh layers and cable armouring junction inside cable connector copper shell, will
The copper mesh being wrapped in outside semi-conductive layer is connected directly through very high frequency(VHF) current transformer, then with cable armouring earth cable,
Point In situ Measurement occurs for Partial discharge signal, to ensure the very high frequency(VHF) characteristic of partial discharge；
The very high frequency(VHF) current transformer prepared by nickel-zinc ferrite material, frequency response is 10M to 50M；Signal acquisition module
Sample rate be 100M and more than, signal processing module be FPGA module or one-chip computer module；Built-in very high frequency(VHF) partial discharge detection dress
Put and optimize the processing that acquisition module supports very high frequency(VHF) signal with computing module；Because collection signal is very high frequency(VHF) signal, effectively arrange
Except cable noise signal so that detection is more accurate, the installation site of very high frequency(VHF) current transformer can effectively shield extraneous electricity
Magnetic wave is disturbed, and cable armouring circulation flows to earth cable without cable connector copper mesh layers by armouring, excludes cable armouring circulation
Interference, the accuracy rate to cable connector partial discharge detection is improved.
In any of the above-described technical scheme preferably, the processing of the very high frequency(VHF) signal employs phase signal and high frequency
The phase electric discharge Atlas Method that signal is combined.
In any of the above-described technical scheme preferably, the very high frequency(VHF) signal processing method is specifically included：Detect cable
X-axis is done on the basis of current phase, same phase discharge capacity collect and makees y-axis making electric discharge collection of illustrative plates, collection of illustrative plates is sentenced by discharging
Disconnected electric discharge type；The calculating of discharge capacity uses Frequency Domain Integration method, and the frequency used is the frequency between 10M to 30M.
In any of the above-described technical scheme preferably, the signal processing method based on very high frequency(VHF) signal, just for
Local cable connector, for the purpose of improving the local cable connector Partial discharge signal accuracy of detection, extraneous signal is excluded as far as possible.
In the prior art, cable connector is typically partial discharge district occurred frequently, is to influence Integral cable work most weak link；
Traditional HFCT methods partial discharge detection detects for high-frequency signal, because cable connector partial discharge to cable external ground cable has a spacing
From usually more than 1 meter, Partial discharge signal decays to high-frequency signal because of the earth cable inductive effect of cable（5 between 15M）,
Meaning is then lost using very high frequency(VHF) detection；Frequency response due to HFCT current transformers is 1 between 20M, can not also do
To very high frequency(VHF) detection；The shortcoming of external high-frequency detection is the Partial discharge signal because other reason disturbed signals such as inductance armouring electric current are big
Often cover in interference signal, it is impossible to recognize.Compared with prior art, built-in very high frequency(VHF) of the invention（VHF）Partial discharge is examined
Device is surveyed by optimizing HFCT for very high frequency(VHF) VHFCT, Current Transmit ring installation site is optimized, by Current Transmit ring
Inside cable connector, by the copper mesh being wrapped in outside semi-conductive layer directly through Current Transmit ring again with cable armouring
Earth cable is connected, and occurs point In situ Measurement in Partial discharge signal, it is ensured that the very high frequency(VHF) characteristic of partial discharge；The present invention it is built-in very
High frequency（VHF）Partial discharge detection installation optimization acquisition module supports the processing of very high frequency(VHF) signal with computing module, because of collection signal
For very high frequency(VHF) signal, cable noise signal is effectively eliminated so that detection is more accurate；The built-in very high frequency(VHF) of the present invention
（VHF）Current Transmit ring is placed in cable connector copper mesh layers and cable armouring junction by partial discharge detection device, and electric current is mutual
Sensor CT rings are built within copper shell, can effectively shield external electromagnetic wave interference, and cable armouring circulation is connect by armouring flow direction
Ground cable also eliminates the interference of cable armouring circulation, therefore cable partial discharge Detection accuracy is greatly improved without copper mesh.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is cable partial discharge signal supervisory instrument structural representation traditional in the prior art；
Fig. 2 is the built-in very high frequency(VHF) partial discharge detection device of the built-in very high frequency(VHF) partial discharge detection device and method according to the present invention
The schematic diagram of one preferred embodiment of mounting structure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment 1
In the prior art, cable connector is typically partial discharge district occurred frequently, is to influence Integral cable work most weak link；Tradition
HFCT methods partial discharge detection be high-frequency signal detection.As shown in Fig. 1 traditional cable partial discharge signal supervisory instrument schematic diagram, pass
System partial discharge detection device, HF current transformer is placed in above earth cable, and the frequency that HFCT is supported is 1M to 20M.Existing
Have in technology, because to cable external ground cable there is certain distance in cable connector partial discharge, usually more than 1 meter, Partial discharge signal because
The earth cable inductive effect of cable, decays to high-frequency signal（5 between 15M）, meaning is then lost using very high frequency(VHF) detection；
Due to HFCT current transformers frequency response for 1 between 20M, can not also accomplish very high frequency(VHF) detect；External high-frequency detection
Have the disadvantage that Partial discharge signal is often covered in interference signal, it is impossible to known because other reason disturbed signals such as inductance armouring electric current are big
Not.
In order to overcome cable connector partial discharge signal detection technology the problems of in the prior art, the embodiment of the present invention
Propose a kind of built-in very high frequency(VHF)（VHF）Partial discharge detection device and method, built-in very high frequency(VHF) of the invention（VHF）Partial discharge detection
Device optimizes Current Transmit ring installation site, Current Transmit ring is pacified by optimizing HFCT for very high frequency(VHF) VHFCT
Inside cable connector, the copper mesh being wrapped in outside semi-conductive layer is connect with cable armouring again directly through Current Transmit ring
Ground cable is connected, and occurs point In situ Measurement in Partial discharge signal, it is ensured that the very high frequency(VHF) characteristic of partial discharge；The present invention's is built-in very high
Frequently（VHF）Partial discharge detection installation optimization acquisition module supports the processing of very high frequency(VHF) signal with computing module, because collection signal is
Very high frequency(VHF) signal, effectively eliminates cable noise signal so that detection is more accurate；The built-in very high frequency(VHF) of the present invention（VHF）
Current Transmit ring is placed in cable connector copper mesh layers and cable armouring junction, Current Transmit by partial discharge detection device
Ring is built within copper shell, can effectively shield external electromagnetic wave interference, and cable armouring circulation flows to earth cable by armouring
Without copper mesh, the interference of cable armouring circulation is also eliminated, therefore cable partial discharge Detection accuracy is greatly improved.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device include very high frequency(VHF) current transformer,
Signal acquisition module, signal processing module；The very high frequency(VHF) current transformer is arranged on inside cable connector copper shell, cable connector
Copper mesh layers and cable armouring junction, cable connector copper mesh layers pass through very high frequency(VHF) current transformer.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device, very high frequency(VHF) current transformer is nickel
The very high frequency(VHF) current transformer of Zn ferrite material.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device, the very high frequency(VHF) current transformer
For the very high frequency(VHF) current transformer based on Rogowski coil mode.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device, the frequency of very high frequency(VHF) current transformer
Rate response is 10M to 50M.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device, the sample rate of signal acquisition module
For 100M and more than.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device, signal processing module is FPGA moulds
Block.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device, signal processing module can also be
One-chip computer module, one-chip computer module can use arm processor or DSP Processor.
Using built-in very high frequency(VHF) as described above（VHF）Partial discharge detection device carries out the real-time of cable connector Partial discharge signal
Detection, the built-in very high frequency(VHF) partial discharge detection method includes：
Built-in very high frequency(VHF) partial discharge detection device includes being arranged on the very high frequency(VHF) current transformer and letter inside cable connector copper shell
Number acquisition module, and the signal processing module being placed in outside cable connector copper shell, very high frequency(VHF) current transformer and signal acquisition
Module is connected by signal wire with signal processing module；
Very high frequency(VHF) current transformer is arranged on cable connector copper mesh layers and cable armouring junction inside cable connector copper shell, will
The copper mesh being wrapped in outside semi-conductive layer is connected directly through very high frequency(VHF) current transformer, then with cable armouring earth cable,
Point In situ Measurement occurs for Partial discharge signal, to ensure the very high frequency(VHF) characteristic of partial discharge；
The very high frequency(VHF) current transformer prepared by nickel-zinc ferrite material, frequency response is 10M to 50M；Signal acquisition module
Sample rate be 100M and more than, signal processing module be FPGA module or one-chip computer module；Built-in very high frequency(VHF) partial discharge detection dress
Put and optimize the processing that acquisition module supports very high frequency(VHF) signal with computing module；Because collection signal is very high frequency(VHF) signal, effectively arrange
Except cable noise signal so that detection is more accurate, the installation site of very high frequency(VHF) current transformer can effectively shield extraneous electricity
Magnetic wave is disturbed, and cable armouring circulation flows to earth cable without cable connector copper mesh layers by armouring, excludes cable armouring circulation
Interference, the accuracy rate to cable connector partial discharge detection is improved.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）In partial discharge detection method, the place of the very high frequency(VHF) signal
Reason employs the phase electric discharge Atlas Method that phase signal is combined with high-frequency signal.Very high frequency(VHF) signal processing method is specifically included：Inspection
X-axis is done on the basis of survey cable current phase, same phase discharge capacity collect and makees y-axis making electric discharge collection of illustrative plates, passes through electric discharge
Collection of illustrative plates judges electric discharge type；The calculating of discharge capacity uses Frequency Domain Integration method, and the frequency used is the frequency between 10M to 30M.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）In partial discharge detection method, the signal processing method with
Based on very high frequency(VHF) signal, just for local cable connector, for the purpose of improving the local cable connector Partial discharge signal accuracy of detection,
Extraneous signal is excluded as far as possible.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device and method, relative to prior art
Middle traditional cable partial discharge signal detecting mode, its feature is：
1st, CT rings material improvement, is improved to very high frequency(VHF) CT rings, response frequency is by original 1M to 20MHZ by original high frequency CT
It is improved to 10M to 50M HZ, it is ensured that the detection of high-frequency signal；
2nd, traditional CT ring installation sites are on earth cable, and new acquisition mode is improved to be arranged on copper mesh and armouring boundary
Place, it is ensured that very high frequency(VHF) signal it is unattenuated；
3rd, traditional collector for processing device is mainly for 10 high-frequency signals for arriving 15M, and new collection is improved to be directed to 10M to 30M
Very high frequency(VHF) signal；
4th, traditional acquisition method can gather cable partial discharge, joint partial discharge, and adjacent joint partial discharge；New acquisition mode
For：Based on very high frequency(VHF) signal, just for local joint, for the purpose of improving the local joint Partial discharge signal accuracy of detection.
In addition, with a kind of many work(disclosed in Publication No. CN203490332U Chinese utility model patent in the prior art
The technical scheme of energy handheld-type intelligent partial discharge detection device compares, the UHFCT used in the art solutions and the present invention
In embodiment there is essential distinction in improved VHFCT：
1：The signal characteristic of collection is different；The signal source that UHFCT is directed to is that high frequent carrier frequency is 300MHz ~~3GHz, this
Antenna should be, CT rings should be without so high-frequency, the built-in very high frequency(VHF) described in the embodiment of the present invention of support（VHF）Partial discharge
Detection means is directed to 10M to 50M frequency signal；
2：Gather the position installed different；Installation site is not mentioned in the art solutions, collection signal has only been said；This is special
Sharp technical scheme is portable detecting device, belongs to inspection, therefore is also impossible to be arranged on inside cable copper shell；And the present invention is implemented
The example built-in very high frequency(VHF)（VHF）Partial discharge detection device installation site is inside cable copper shell, cable copper mesh and armouring join
Place, its purpose is also that only can collect the Partial discharge signal of very high frequency(VHF) at this, and the earth cable of Partial discharge signal to cable is
Frequency of fadings is high-frequency signal；
3：Collector is different from arithmetic unit；By UHF signals by envelope processing in the art solutions, frequency reducing is HF signals；
And built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device directly gathers VHF signal, utilizes Frequency Domain Integration side
Formula, calculates discharge capacity；
4：Application purpose is different；The art solutions be portable inspection device, and described in the embodiment of the present invention it is built-in very
High frequency（VHF）Partial discharge detection device is Always Online" formula detection means.
Embodiment 2
A kind of built-in very high frequency(VHF)（VHF）Partial discharge detection device, the device includes very high frequency(VHF) current transformer, signal acquisition mould
Block, signal processing module, very high frequency(VHF) current transformer and signal acquisition module are arranged on inside cable connector copper shell and by letter
Number line is connected with the signal processing module being placed in outside cable connector copper shell.
In the built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）In partial discharge detection device, very high frequency(VHF) current transformer
For the very high frequency(VHF) current transformer of nickel-zinc ferrite material.Very high frequency(VHF) current transformer can also be based on Rogowski coil
The very high frequency(VHF) current transformer of mode.The frequency response of very high frequency(VHF) current transformer is 10M to 50M.
In the built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）In partial discharge detection device, signal acquisition module is adopted
Sample rate be 100M and more than.Signal processing module is FPGA module, and signal processing module can also be one-chip computer module, single-chip microcomputer
Module can use arm processor or DSP Processor.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device, as shown in Fig. 2 in specific implementation
In, very high frequency(VHF) current transformer includes transformer 1 and transformer 2, and transformer 1 and transformer 2 are connected by signal wire respectively to be believed
The cable connector copper mesh layers that number processing module, transformer 1 and transformer 2 are arranged on inside cable connector copper shell connect with cable armouring
Place is met, cable connector copper mesh layers are connected with cable armouring earth cable again after passing through transformer 1 and transformer 2.
Using built-in very high frequency(VHF) as described above（VHF）Partial discharge detection device carries out the real-time of cable connector Partial discharge signal
Detection, the built-in very high frequency(VHF) partial discharge detection method includes：
Built-in very high frequency(VHF) partial discharge detection device includes being arranged on the very high frequency(VHF) current transformer and letter inside cable connector copper shell
Number acquisition module, and the signal processing module being placed in outside cable connector copper shell, very high frequency(VHF) current transformer and signal acquisition
Module is connected by signal wire with signal processing module；
Very high frequency(VHF) current transformer is arranged on cable connector copper mesh layers and cable armouring junction inside cable connector copper shell, will
The copper mesh being wrapped in outside semi-conductive layer is connected directly through very high frequency(VHF) current transformer, then with cable armouring earth cable,
Point In situ Measurement occurs for Partial discharge signal, to ensure the very high frequency(VHF) characteristic of partial discharge；
The very high frequency(VHF) current transformer prepared by nickel-zinc ferrite material, frequency response is 10M to 50M；Signal acquisition module
Sample rate be 100M and more than, signal processing module be FPGA module or one-chip computer module；Built-in very high frequency(VHF) partial discharge detection dress
Put and optimize the processing that acquisition module supports very high frequency(VHF) signal with computing module；Because collection signal is very high frequency(VHF) signal, effectively arrange
Except cable noise signal so that detection is more accurate, the installation site of very high frequency(VHF) current transformer can effectively shield extraneous electricity
Magnetic wave is disturbed, and cable armouring circulation flows to earth cable without cable connector copper mesh layers by armouring, excludes cable armouring circulation
Interference, the accuracy rate to cable connector partial discharge detection is improved.
In the built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）In partial discharge detection method, the very high frequency(VHF) signal
Processing employs the phase electric discharge Atlas Method that phase signal is combined with high-frequency signal.Very high frequency(VHF) signal processing method is specifically included：
X-axis is done on the basis of detection cable current phase, same phase discharge capacity collect and makees y-axis making electric discharge collection of illustrative plates, by putting
Electrograph spectrum judges electric discharge type；The calculating of discharge capacity uses Frequency Domain Integration method, and the frequency used is the frequency between 10M to 30M.
In the built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）In partial discharge detection method, the signal processing method
Based on very high frequency(VHF) signal, just for local cable connector, to improve the local cable connector Partial discharge signal accuracy of detection as mesh
, extraneous signal is excluded as far as possible.
Built-in very high frequency(VHF) described in the embodiment of the present invention（VHF）Partial discharge detection device and method, be by optimizing HFCT
Very high frequency(VHF) VHFCT.Current Transmit ring installation site is optimized, Current Transmit ring is arranged on inside cable connector.
The copper mesh being wrapped in outside semi-conductive layer is connected with cable armouring earth cable again directly through Current Transmit ring.In partial discharge
Point In situ Measurement occurs for signal, it is ensured that the very high frequency(VHF) characteristic of partial discharge so that cable partial discharge Detection accuracy is greatly improved.
The above is only that the preferred embodiment of the present invention is described, and is not that the scope of the present invention is limited
It is fixed；It the foregoing is only the embodiment of the present invention, the protection domain being not intended to limit the present invention；Do not departing from
On the premise of design spirit of the present invention, what this area ordinary skill technical staff made to technical scheme any repaiies
Change, equivalent, improvement etc., in the protection domain that claims of the present invention determination all should be fallen into.
Claims (10)
1. a kind of built-in very high frequency(VHF) partial discharge detection device, at cable connector, it is characterised in that：The device includes very high
Frequency current transformer, signal acquisition module, signal processing module；The very high frequency(VHF) current transformer is arranged on cable connector copper shell
Internal, cable connector copper mesh layers and cable armouring junction, cable connector copper mesh layers pass through very high frequency(VHF) current transformer.
2. built-in very high frequency(VHF) partial discharge detection device as claimed in claim 1, it is characterised in that：The very high frequency(VHF) Current Mutual Inductance
Device is the very high frequency(VHF) current transformer of nickel-zinc ferrite material.
3. built-in very high frequency(VHF) partial discharge detection device as claimed in claim 1, it is characterised in that：The very high frequency(VHF) Current Mutual Inductance
Device is the very high frequency(VHF) current transformer based on Rogowski coil mode.
4. built-in very high frequency(VHF) partial discharge detection device as claimed in claim 1, it is characterised in that：The very high frequency(VHF) Current Mutual Inductance
The frequency response of device is 10M to 50M.
5. the built-in very high frequency(VHF) partial discharge detection device as any one of Claims 1-4, it is characterised in that：It is described very
HF current transformer is arranged on inside cable connector copper shell, is placed in cable connector copper mesh layers and cable armouring junction.
6. built-in very high frequency(VHF) partial discharge detection device as claimed in claim 5, it is characterised in that：The very high frequency(VHF) Current Mutual Inductance
Device is arranged on cable connector copper mesh layers and cable armouring junction inside cable connector copper shell, and cable connector copper mesh layers are through very
After HF current transformer, then it is connected with cable armouring earth cable.
7. built-in very high frequency(VHF) partial discharge detection device as claimed in claim 1, it is characterised in that：The signal acquisition module
Sample rate be 100M and more than.
8. built-in very high frequency(VHF) partial discharge detection device as claimed in claim 1, it is characterised in that：The signal processing module is
FPGA module.
9. built-in very high frequency(VHF) partial discharge detection device as claimed in claim 1, it is characterised in that：The signal processing module is
One-chip computer module.
10. a kind of built-in very high frequency(VHF) partial discharge detection method, using as claimed in any one of claims 1-9 wherein it is built-in very
High frequency partial discharge detection device carries out the real-time detection of cable connector Partial discharge signal, it is characterised in that：This method includes：
Built-in very high frequency(VHF) partial discharge detection device includes being arranged on the very high frequency(VHF) current transformer and letter inside cable connector copper shell
Number acquisition module, and the signal processing module being placed in outside cable connector copper shell, very high frequency(VHF) current transformer and signal acquisition
Module is connected by signal wire with signal processing module；
Very high frequency(VHF) current transformer is arranged on cable connector copper mesh layers and cable armouring junction inside cable connector copper shell, will
The copper mesh being wrapped in outside semi-conductive layer is connected directly through very high frequency(VHF) current transformer, then with cable armouring earth cable,
Point In situ Measurement occurs for Partial discharge signal, to ensure the very high frequency(VHF) characteristic of partial discharge；
The very high frequency(VHF) current transformer prepared by nickel-zinc ferrite material, frequency response is 10M to 50M；Signal acquisition module
Sample rate be 100M and more than, signal processing module be FPGA module or one-chip computer module；Built-in very high frequency(VHF) partial discharge detection dress
Put and optimize the processing that acquisition module supports very high frequency(VHF) signal with computing module；Because collection signal is very high frequency(VHF) signal, effectively arrange
Except cable noise signal so that detection is more accurate, the installation site of very high frequency(VHF) current transformer can effectively shield extraneous electricity
Magnetic wave is disturbed, and cable armouring circulation flows to earth cable without cable connector copper mesh layers by armouring, excludes cable armouring circulation
Interference, the accuracy rate to cable connector partial discharge detection is improved.
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| CN201710225612.4A CN106950477A (en) | 2017-04-07 | 2017-04-07 | A kind of built-in very high frequency(VHF) partial discharge detection device and method |
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| CN107643435A (en) * | 2017-10-31 | 2018-01-30 | 现代重工(中国)电气有限公司 | Differential protection cable socket and the Current Mutual Inductance circuit protection device being made from it |
| CN108646150A (en) * | 2018-05-02 | 2018-10-12 | 国网江苏省电力有限公司电力科学研究院 | A kind of sea electric power cable partial discharge detection device |
| CN108957258A (en) * | 2018-07-06 | 2018-12-07 | 深圳供电局有限公司 | High-voltage cable very high frequency partial discharge live-line test device and test method |
| CN109031060A (en) * | 2018-07-06 | 2018-12-18 | 深圳供电局有限公司 | Live very high frequency partial discharge testing device and method for outdoor cable terminal on tower |
| CN109116200A (en) * | 2018-09-03 | 2019-01-01 | 深圳供电局有限公司 | High-voltage cable insulation joint with built-in very high frequency partial discharge sensing device |
| CN111141999A (en) * | 2019-12-30 | 2020-05-12 | 国家电网有限公司 | Cable partial discharge detection method and device |
| CN111551832A (en) * | 2020-06-01 | 2020-08-18 | 广西电网有限责任公司南宁供电局 | Method and device for high-precision positioning and noise removal of partial discharge of cable |
| CN111999537A (en) * | 2020-09-29 | 2020-11-27 | 广东电网有限责任公司江门供电局 | Miniature built-in signal generator and cable partial discharge simulation method thereof |
| US11567146B2 (en) | 2018-09-10 | 2023-01-31 | 3M Innovative Properties Company | Electrical power cable monitoring device using low side electrode and earth ground separation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107643435A (en) * | 2017-10-31 | 2018-01-30 | 现代重工(中国)电气有限公司 | Differential protection cable socket and the Current Mutual Inductance circuit protection device being made from it |
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| CN109116200B (en) * | 2018-09-03 | 2024-03-19 | 深圳供电局有限公司 | High-voltage cable insulation joint with built-in very high frequency partial discharge sensing device |
| US11567146B2 (en) | 2018-09-10 | 2023-01-31 | 3M Innovative Properties Company | Electrical power cable monitoring device using low side electrode and earth ground separation |
| US11604218B2 (en) | 2018-09-10 | 2023-03-14 | 3M Innovative Properties Company | Electrical power cable monitoring device including partial discharge sensor |
| US11670930B2 (en) | 2018-09-10 | 2023-06-06 | 3M Innovative Properties Company | Support structure for cable and cable accessory condition monitoring devices |
| US12062891B2 (en) | 2018-12-21 | 2024-08-13 | 3M Innovative Properties Company | Electrical power cable preparation device |
| CN111141999A (en) * | 2019-12-30 | 2020-05-12 | 国家电网有限公司 | Cable partial discharge detection method and device |
| US11988703B2 (en) | 2019-12-31 | 2024-05-21 | 3M Innovative Properties Company | Monitoring system for evaluating a condition of an electrical grid |
| CN111551832A (en) * | 2020-06-01 | 2020-08-18 | 广西电网有限责任公司南宁供电局 | Method and device for high-precision positioning and noise removal of partial discharge of cable |
| CN111551832B (en) * | 2020-06-01 | 2023-06-02 | 广西电网有限责任公司南宁供电局 | Cable partial discharge high-precision positioning and noise removing method and device |
| CN111999537A (en) * | 2020-09-29 | 2020-11-27 | 广东电网有限责任公司江门供电局 | Miniature built-in signal generator and cable partial discharge simulation method thereof |
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Application publication date: 20170714 |