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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
vhf
high frequency
partial discharge
cable
signal
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.)
Pending
Application number
CN201710225612.4A
Other languages
Chinese (zh)
Inventor
王玮
臧磊
朱祖华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang New Toovey Electronic Technology Co Ltd
Zhejiang Tuwei Electricity Technology Co Ltd
Original Assignee
Zhejiang New Toovey Electronic Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang New Toovey Electronic Technology Co Ltd filed Critical Zhejiang New Toovey Electronic Technology Co Ltd
Priority to CN201710225612.4A priority Critical patent/CN106950477A/en
Publication of CN106950477A publication Critical patent/CN106950477A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • G01R31/1227Testing 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
    • G01R31/1263Testing 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
    • G01R31/1272Testing 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

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

A kind of built-in very high frequency(VHF) partial discharge detection device and method
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.
CN201710225612.4A 2017-04-07 2017-04-07 A kind of built-in very high frequency(VHF) partial discharge detection device and method Pending CN106950477A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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

Publications (1)

Publication Number Publication Date
CN106950477A true CN106950477A (en) 2017-07-14

Family

ID=59475001

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710225612.4A Pending CN106950477A (en) 2017-04-07 2017-04-07 A kind of built-in very high frequency(VHF) partial discharge detection device and method

Country Status (1)

Country Link
CN (1) CN106950477A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108957258A (en) * 2018-07-06 2018-12-07 深圳供电局有限公司 A kind of high-tension cable very high frequency(VHF) partial discharge live testing device and test method
CN109031060A (en) * 2018-07-06 2018-12-18 深圳供电局有限公司 Outdoor cable terminal electrification very high frequency(VHF) partial discharge test device and method on a kind of tower
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108957258A (en) * 2018-07-06 2018-12-07 深圳供电局有限公司 A kind of high-tension cable very high frequency(VHF) partial discharge live testing device and test method
CN109031060A (en) * 2018-07-06 2018-12-18 深圳供电局有限公司 Outdoor cable terminal electrification very high frequency(VHF) partial discharge test device and method on a kind of tower
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

Similar Documents

Publication Publication Date Title
CN106950477A (en) A kind of built-in very high frequency(VHF) partial discharge detection device and method
CN105467241B (en) A kind of distribution converter transformer DC magnetic bias detecting system and its detection method
CN105606975A (en) Localizable ultrahigh-frequency cable partial discharge detection method and device
CN203490332U (en) Multifunctional hand-held smart partial discharge detection device
CN103529366A (en) UHF (Ultra High Frequency) broadband current sensor based on Rogowski coil principle and joint monitoring system
CN103558525A (en) Method for detection of partial discharge of switch cabinet
CN111856224A (en) Partial discharge multi-source fusion detection system and method for high-voltage switch cabinet
CN107831413B (en) The electromagnetic wave detection device and method of transmission line of electricity corona discharge based on unmanned plane
CN102116824A (en) Distributed local discharge on-line monitoring method and device for high voltage cable system
CN204028288U (en) The checkout equipment of cable local discharge and capacitive coupled sensors
CN203826281U (en) Vacuum degree monitoring device of vacuum circuit breaker
CN101710166A (en) Method for monitoring partial discharge of power cable connector on line
CN106841939A (en) The portable acoustoelectric combined detection means of GIS partial discharge and its detection method
CN103558526A (en) Method for detection of partial discharge of switch cabinet
CN106249118A (en) Based on GIS device superfrequency partial discharge detecting system under surge voltage
CN111175614A (en) Partial discharge acquisition and positioning method, device and system
CN112904147B (en) Power transmission line fault and pre-discharge monitoring device and signal processing method
CN103743993B (en) A kind of method detecting deformation of transformer winding
CN208421140U (en) A kind of robot shelf depreciation cruising inspection system
CN105334442A (en) Cable partial discharge measuring circuit and device
CN206804798U (en) A kind of built-in very high frequency(VHF) partial discharge detection device
CN202041614U (en) Insulation defect local discharging signal identifying device of ultrahigh voltage cable line
CN203630279U (en) Detection device for partial discharge of switch cabinet
CN109799432B (en) Electrical equipment discharge fault positioning device
CN203414562U (en) Integrated ultrahigh frequency detection and determination apparatus for partial discharge of GIS

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination