CN106324454B - A kind of XLPE cable insulation detection device and its electromagnetism interference method - Google Patents
A kind of XLPE cable insulation detection device and its electromagnetism interference method Download PDFInfo
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- CN106324454B CN106324454B CN201610679809.0A CN201610679809A CN106324454B CN 106324454 B CN106324454 B CN 106324454B CN 201610679809 A CN201610679809 A CN 201610679809A CN 106324454 B CN106324454 B CN 106324454B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
Abstract
The invention discloses a kind of XLPE cable insulation detection device and its electromagnetism interference methods, when XLPE cable floating measurement, by the way that XLPE cable is placed in faraday cup, realize electric field shielding；Use the conducting wire for being wound with low-resistivity layer shielding line as measure traverse line, realizes magnetic field shielding；By low-resistivity layer shielding ring, realize that revealing in measurement process along face is interfered.When exciting signal source suspends, by the way that driving source to be placed in the metal shell of faraday cup, realizes the electric field shielding in measurement process, use the conducting wire for being wound with low-resistivity layer shielding line as measure traverse line, realize the magnetic field shielding in measurement process；By low-resistivity layer shielding ring, realize that revealing in measurement process along face is interfered.The present invention solves in current XLPE cable polarization-depolarization current difference mode of connection measurement process, due to electric jamming, magnetic interference and leakage caused by polarization-depolarization current influences problem along face, improves XLPE cable polarization-depolarization current measurement accuracy.
Description
Technical field
The invention belongs to the diagnosis of crosslinked polyethylene (Cross Linked Polyethylene, XLPE) cable insulation status
Field is arranged more particularly, to a kind of for different modes XLPE cable polarization-depolarization current measurement electromagnetism interference
It applies.
Background technique
Relative to traditional oils paper insulated cable, oil-free and auxiliary device is few inside XLPE cable, laid processes and operation dimension
Shield is simple, has excellent mechanical performance and electric property, is gradually widely used in urban distribution network system.Therefore, carry out
XLPE cable insulation condition diagnosis, it is ensured that XLPE cable safely and steadily runs significant for power supply reliability.
Since XLPE cable laying environment is complicated, electricity, heat, moisture, machinery, extraneous ring will receive in During Process of Long-term Operation
Border, the influence of the factors such as chemical attack, the microstructure for causing XLPE cable to insulate change, and service life reduction is final to threaten
The safe and reliable operation of cable.Therefore, it is necessary to insulate to carry out condition diagnosing to XLPE cable from XLPE cable microstructure angle,
Assess its insulation status.
When DC voltage is applied in XLPE cable insulation outside, insulating materials will generate dielectric polarization phenomenon, with
XLPE cable insulate microstructure variation, different types of dielectric polarization occupy it is leading so that flowing through the pole of cable insulation
Different characteristics is presented in galvanic current.When remove it is outer apply DC voltage after, when being shorted XLPE cable core and metal screen layer, cable is exhausted
Defect inside edge, the charge that impurity etc. fetters in polarization process gradually will externally discharge, the XLPE electricity of different degree of agings
Cable, bound charge ability is different, and it is different that depolarization current when being shorted is presented in this.Therefore, by measuring XLPE cable
The polarization of insulation and depolarization current can assess cable insulation situation.
Since XLPE cable insulation has high resistance value, this makes the polarization current for flowing through XLPE cable insulation and goes to pole
Galvanic current is usually 10-6A~10-12A, faint polarization and depolarization current make it in measurement process, are highly prone to electricity
Field, magnetic field and the interference along face Leakage Current, so that measurement result misalignment, causes to judge by accident to XLPE cable insulation status.
Summary of the invention
For this problem of the prior art, the invention discloses a kind of XLPE cable polarization-depolarization current measurements
Thus electromagnetism interference method solves under current different measurement circuits, institute in XLPE cable polarization-depolarization current measurement process
The electric jamming faced, magnetic interference and is interfered along face Leakage Current, improves XLPE cable polarization-depolarization current measurement
Accuracy.
The present invention provides a kind of electromagnetism interference method of XLPE cable polarization-depolarization current measurement, including it is following
Step:
To XLPE cable floating type measure circuit, by XLPE cable be placed in faraday cup in, and by the faraday cup with
The earth connects；
By driving source High voltage output by having the cable of high insulation to be connected with XLPE cable core, by current measurement
Blocks current enters end and is connected with XLPE cable metal screen layer, and current measurement module electric current outlet and the earth are reliably connected,
Driving source low-pressure side is connect with the earth；
By low-resistivity layer shielding ring be applied to XLPE cable both ends along face, and draw wiring with the earth connect；
Low-resistivity layer shielding line is wound on the connecting line of test loop, the low resistance conductive ring of closure is formed.
The present invention also provides a kind of XLPE cable polarization-depolarization current measurement electromagnetism interference methods, including under
State step:
To exciting signal source floating measurement circuit, exciting signal source is placed in faraday cup, faraday cup connects with the earth
It connects；
Driving source High voltage output is connected by having the cable of high insulation to pass through faraday cup with XLPE cable core
It connects, current measurement module electric current is entered and is connect after end is connected with XLPE cable metal screen layer with the earth, by current measurement mould
Block electric current outlet is connect with driving source low-pressure side；
By low-resistivity layer shielding ring be applied to XLPE cable both ends along face, and draw wiring, connect with driving source low-pressure side；
Low-resistivity layer shielding line is wound on the connecting line of test loop, the low resistance conductive ring of closure is formed.
The present invention also provides a kind of XLPE cable polarization-depolarization current measurement electromagnetism interference methods, including under
State step:
To current measurement module floating type measure circuit, by current measurement module be placed in faraday cup in, faraday cup with
The earth connects；
By driving source High voltage output by having the cable of high insulation to pass through faraday cup and current measurement module electric current
Enter end to be reliably connected, current measurement module electric current outlet is connected with XLPE cable core, by XLPE cable metal screen layer
Be greatly reliably connected, by driving source low-pressure side with the earth connect；
By low-resistivity layer shielding ring be applied to XLPE cable both ends along face, and draw wiring, connect with driving source high-pressure side；
Low-resistivity layer shielding line is wound on the connecting line of test loop, the low resistance conductive ring of closure is formed.
Further, when being wound low resistance conductive ring using low-resistivity layer shielding line, the low resistance conductive anchor ring product of formation
It is as close with the area of test loop as possible, achieve the purpose that offset external magnetic field as far as possible.
Further, when being applied to XLPE cable both ends along face using low-resistivity layer shielding ring, low-resistivity layer shielding ring used is
Flexible low-resistance belt with favorable elasticity is realized by being closely wound and cable is along the purpose of face rigid contact, avoid along face
Influence of the Leakage Current to measurement result.
In the present invention, using the conducting wire for being wound with low resistance conductive ring, the low-resistance that closure is formed in entirely measurement circuit is led
Electric ring is interfered by the reverse induction magnetic field cancellation external magnetic field that low resistance conductive ring generates.Using low-resistivity layer shielding ring, will be let out along face
Dew electric current bridges across current measurement module, avoids along face Leakage Current to polarization-depolarization current measurement interference.Use method
Cage is drawn, generates Leakage Current over the ground through faraday cup with driving source high-pressure side there are high resistant insulation, is avoided between shielding test product,
Influence the measurement of polarization-depolarization current.Output line has high dielectric strength, guarantees that it will not when passing through faraday cup
Severe leakage is caused over the ground, influences the measurement of polarization-depolarization current.
The present invention also provides a kind of XLPE cable polarization-depolarization current measuring devices, comprising: driving source, electric current are surveyed
Measure module, low-resistivity layer shielding line, faraday cup and the XLPE cable being arranged in inside the faraday cup, metal screen layer and two
A low-resistivity layer shielding ring；The high-voltage output line of the driving source passes through the faraday cup, and the high-voltage output line inner core and institute
State the core connection of XLPE cable；The lead picked out from the metal screen layer passes through the faraday cup and is connected to the electricity
The input terminal of flow measurement module, the output end of the current measurement module are grounded with the driving source low-pressure side；Described in two
Low-resistivity layer shielding ring is respectively arranged at the both ends of the XLPE cable, and the extraction wiring of the low-resistivity layer shielding ring passes through faraday cup simultaneously
Ground connection；The low-resistivity layer shielding line is wound in the driving source low-pressure side and the current measurement module wiring, and with it is described
The outer core of driving source high-voltage output line connects, and forms low resistance conductive ring.Wherein, the XLPE cable of suspension is placed in faraday cup
In, mask the interference electric current that external electrical field is coupled into test loop by stray capacitance.
Further, after being cleaned to XLPE cable end, XLPE cable is supported in using insulation column described
In faraday cup.
The present invention also provides a kind of XLPE cable insulation detection devices, comprising: driving source, current measurement module, low-resistance
Shielding line, faraday cup, XLPE cable, metal screen layer and two low-resistivity layer shielding rings；The driving source is set to the farad
In cage, and the high-voltage output line of the driving source pass through the faraday cup after the high-voltage output line inner core with it is described
The core of XLPE cable connects；The cable metallic screens layer, which is starved, picks out wire ground；The input terminal of the current measurement module
Ground connection, the output end of the current measurement module are connected after passing through the faraday cup with the driving source low-pressure side；Two low
Resistance shading ring is separately positioned on the both ends of the XLPE cable, and the extraction wiring of low-resistivity layer shielding ring after faraday cup and swashs
Encourage the connection of source low-pressure side；The low-resistivity layer shielding line is wound in the driving source low-voltage side outlet and the current measurement module wiring
On, and connect with the outer core of the driving source high-voltage output line, form low resistance conductive ring.Wherein, the driving source of suspension is placed in
In faraday cup, the interference electric current that external electrical field is coupled into test loop by stray capacitance is masked, while avoiding extraneous electricity
Interference of the field to driving source, improves driving source output accuracy.
The present invention also provides a kind of XLPE cable insulation detection devices, comprising: driving source, current measurement module, low-resistance
Shielding line, faraday cup, XLPE cable, metal screen layer and two low-resistivity layer shielding rings；The current measurement module is arranged in institute
It states in faraday cup, the driving source high-voltage output line passes through the inner core and the electric current of the high-voltage output line after faraday cup
The input terminal of measurement module connects, and the output end of the current measurement module passes through the faraday cup and the XLPE cable
Core is connected；The cable metallic screens layer picks out wire ground, and the driving source low-pressure side picks out wire ground；Two
Low-resistivity layer shielding ring is separately positioned on the both ends of the XLPE cable, the extraction wiring of low-resistivity layer shielding ring pass through the faraday cup with
The current measurement module current input terminal connection；The low-resistivity layer shielding line is wound in the driving source low-voltage side outlet and electric current
In measurement module wiring, and connect with the outer core of driving source high-voltage output line, forms low resistance conductive ring.Wherein, by the electricity of suspension
Flow measurement module is placed in faraday cup, masks the interference electric current that external electrical field is coupled into test loop by stray capacitance,
Influence of the external electrical field to devices such as current supply circuit, the AD conversion circuits of current measurement module is avoided simultaneously, improves current measurement
The accuracy of module measurement.
Further, in different measurement methods, by XLPE cable, driving source, current measurement module is placed in farad
When cage, each module is suspended in faraday cup using insulation column, realize physics between each module and faraday cup every
From guarantee good insulation.
Further, when being wound low resistance conductive ring using low-resistivity layer shielding line, the low resistance conductive anchor ring product of formation
It is as close with the area of test loop as possible, achieve the purpose that offset external magnetic field as far as possible.
Further, when being applied to XLPE cable both ends along face using low-resistivity layer shielding ring, low-resistivity layer shielding ring used is
Flexible low-resistance belt with favorable elasticity is realized by being closely wound and cable is along the purpose of face rigid contact, avoid along face
Influence of the Leakage Current to measurement result.
In general, disclosed above technical scheme through the invention, can obtain it is following the utility model has the advantages that
(1) to XLPE cable floating measurement mode, by the way that XLPE cable to be placed in faraday cup, pass through electrostatic equilibrium original
Reason, layer charge is mobile outside faraday cup, balances each other with external electrical field, and the equipotential of a not no electric field is formed inside faraday cup
Body has the function that external electrical field is isolated, avoids external electrical field by stray capacitance and generate induction on XLPE cable test product
Electric current influences measurement result；
(2) to driving source floating measurement mode, by the way that driving source to be placed in faraday cup, so that driving source internal electron
Device is isolated with external electrical field, is avoided external electrical field by interference of the distribution capacity to driving source internal electronic device, is improved
The output accuracy of driving source；
(3) to current measurement module floating measurement mode, by the way that current measurement module to be placed in faraday cup, so that electric
Flow measurement module is in inside faraday cup the not equipotential volume kind of electric field, avoids external electrical field by distribution capacity to electric current
Current supply circuit in measurement module, the influence of the electronic chips such as AD conversion chip, improves the measurement accuracy of current measurement module；
(4) in faraday cup each module when being placed in faraday cup, use the polytetrafluoroethylene (PTFE) with high insulation as
Insulation column is supported, and is guaranteed there is good insulation in faraday cup between each module and faraday cup, is avoided excitation
Source high-pressure side generates Leakage Current over the ground by faraday cup, influences measurement result；
(5) the low resistance conductive ring formed by low-resistivity layer shielding line is low at this when measurement loop-external is there are when alternating magnetic field
Corresponding induced current is generated on resistance conducting ring, which forms the magnetic field opposite with external magnetic-field direction, hands over outside
Varying magnetic field offsets, and reduces influence of the external magnetic field to measurement result；
(6) by low-resistivity layer shielding ring, make in measurement process that Leakage Current is not passed through current measurement module along face, avoid and let out
Reveal influence of the electric current to measurement result.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of XLPE cable floating measurement mode provided in an embodiment of the present invention.
Fig. 2 is the structural schematic diagram of driving source floating measurement mode provided in an embodiment of the present invention.
Fig. 3 is the structural schematic diagram of current measurement module floating measurement mode provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
A kind of electromagnetism interference method of XLPE cable insulation detection device disclosed by the invention, is divided into three parts:
XLPE cable floating measurement mode, driving source floating measurement mode and current measurement module floating measurement mode.
XLPE cable floating measurement mode proposed by the present invention, is supported in farad using insulation column for XLPE cable first
In cage, then by faraday cup strong ground；Then driving source High voltage output is passed through into faraday cup and electricity by cable
Cable core connects, and current measurement module electric current is entered end and is connected with XLPE cable metal screen layer, by current measurement module electricity
Outflow end is reliably connected with the earth, and driving source low-pressure side and the earth are reliably connected.Then low-resistivity layer shielding ring is applied to XLPE
Cable ends along face, and draw wiring, and be greatly reliably connected.Low-resistivity layer shielding line is finally wound in the company of test loop
In wiring, the low resistance conductive ring of closure is formed.
Driving source floating measurement mode proposed by the present invention, is supported in faraday cup using insulation column for driving source first
In, then by faraday cup strong ground；Then driving source High voltage output is passed through into faraday cup and cable by cable
Core connects, and XLPE cable metal screen layer is connected with current measurement module, and is reliably connected in the earth；By current measurement mould
Block electric current outlet is reliably connected with driving source low-pressure side.Then by low-resistivity layer shielding ring be applied to XLPE cable both ends along face,
And wiring is drawn, it is connect with driving source low-pressure side.Finally low-resistivity layer shielding line is wound on the connecting line of test loop, formation is closed
The low resistance conductive ring of conjunction.
Current measurement module is used insulation column branch first by current measurement module floating measurement mode proposed by the present invention
It supports in faraday cup, then by faraday cup strong ground；Then driving source High voltage output is passed through into farad by cable
Cage enters end with current measurement module electric current and connects, and current measurement module electric current outlet is connected with XLPE cable core, will
XLPE cable metal screen layer and driving source low-pressure side are reliably connected with the earth.Then low-resistivity layer shielding ring is applied to XLPE cable
Both ends along face, and draw wiring, and be greatly reliably connected.Low-resistivity layer shielding line is finally wound in the connecting line of test loop
On, form the low resistance conductive ring of closure.
Driving source high-pressure side proposed by the present invention output cable, for the double core cabinet conductor with height insulation, inner core is will
The conducting wire of High voltage output, outer core are used to form a part of low-resistivity layer shielding ring.Height insulation guarantees that cable is passing through faraday cup
When, core and faraday cup keep good insulation, avoid the Leakage Current over the ground generated through faraday cup.
Low-resistivity layer shielding ring proposed by the present invention, under the different modes of connection, by cable end anti-leak conductor loop by edge
Face Leakage Current bridges across current measurement module, avoids the influence along face Leakage Current to measurement result.
The low resistance conductive ring proposed by the present invention being entwined using low-resistivity layer shielding line is formd and entirely measures circuit face
The similar closed circuit of product generates the interference of reverse induction magnetic field cancellation external magnetic field in measurement process.
In order to which further description is provided in an embodiment of the present invention for in-site measurement XLPE cable polarization-depolarising electricity
The method of stream, now in conjunction with attached drawing and specific example, details are as follows:
As shown in Figure 1, after being cleaned using superfine fibre paper to XLPE cable end, using insulation column by XLPE
Cable support is in faraday cup；Then driving source high-voltage output line is passed through into faraday cup, output line inner core and cable core
Connect；Lead is picked out from cable metallic screens layer being connected to current measurement module across faraday cup and enter end, current measurement module is defeated
Outlet and the common reliable ground of driving source low-pressure side；By low-resistivity layer shielding ring is firm be connected to cable ends after, draw wiring pass through method
Cage is drawn to be connected to the earth；It is wound on driving source low-voltage side outlet and current measurement module wiring using low-resistivity layer shielding line, and with
The outer core of driving source high-voltage output line connects, and forms low resistance conductive ring, completes the wiring in measurement circuit.
As shown in Fig. 2, will be motivated after being cleaned using superfine fibre paper to XLPE cable end using insulation column
Source is supported in faraday cup；Then driving source high-voltage output line is passed through into faraday cup, output line inner core and cable core phase
It connects；Lead reliable ground is picked out from cable metallic screens layer；Current measurement module input terminal and the earth are reliably connected, output end
It is connected across faraday cup with driving source low-pressure side；Low-resistivity layer shielding ring is firm be connected to cable ends after, draw wiring pass through method
Cage is drawn to connect with driving source low-pressure side；Driving source low-voltage side outlet is wound in using low-resistivity layer shielding line and current measurement module connects
On line, and connect with the outer core of driving source high-voltage output line, form low resistance conductive ring, completes the wiring in measurement circuit.
As shown in figure 3, after being cleaned using superfine fibre paper to XLPE cable end, using insulation column by electric current
Measurement module is supported in faraday cup；Then driving source high-voltage output line is passed through into faraday cup, output line inner core and electric current
Measurement module input terminal connects；Current measurement module output end is passed through faraday cup to be connected with cable core；From cable gold
Belong to shielded layer to pick out lead and be greatly reliably connected, driving source low-pressure side picks out lead and is reliably connected with the earth；Low-resistivity layer shielding ring
It is firm be connected to cable ends after, draw wiring pass through faraday cup connect with current measurement module current input terminal；Use low-resistance
Shielding line is wound on driving source low-voltage side outlet and current measurement module wiring, and the outer core phase with driving source high-voltage output line
It connects, forms low resistance conductive ring, complete the wiring in measurement circuit.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of electromagnetism interference method based on XLPE cable insulation detection device, the XLPE cable insulation detection device packet
It includes: driving source, current measurement module, low-resistivity layer shielding line, faraday cup and the XLPE electricity being arranged in inside the faraday cup
Cable, metal screen layer and two low-resistivity layer shielding rings；It is characterized in that, the electromagnetism interference method includes the following steps:
Circuit is measured to XLPE cable floating type, XLPE cable is placed in faraday cup, and by the faraday cup and greatly
Connection；
By driving source High voltage output by having the cable of high insulation to be connected with XLPE cable core, by current measurement module
Electric current enters end and is connected with XLPE cable metal screen layer, and current measurement module electric current outlet and the earth are reliably connected, will be swashed
Source low-pressure side is encouraged to connect with the earth；
By low-resistivity layer shielding ring be applied to XLPE cable both ends along face, and draw wiring with the earth connect；
Low-resistivity layer shielding line is wound on the connecting line of test loop, the low resistance conductive ring of closure is formed.
2. electromagnetism interference method as described in claim 1, which is characterized in that after being cleaned to XLPE cable end, make
XLPE cable is supported in the faraday cup with insulation column.
3. a kind of electromagnetism interference method based on XLPE cable insulation detection device, the XLPE cable insulation detection device packet
It includes: driving source, current measurement module, low-resistivity layer shielding line, faraday cup, XLPE cable, metal screen layer and two low-resistivity layer shieldings
Ring；It is characterized in that, the electromagnetism interference method includes the following steps:
To exciting signal source floating measurement circuit, exciting signal source is placed in faraday cup, faraday cup is connect with the earth；
Driving source High voltage output is connected by having the cable of high insulation to pass through faraday cup with XLPE cable core, it will
Current measurement module electric current, which enters, to be connect after end is connected with XLPE cable metal screen layer with the earth, by current measurement module electric current
Outlet is connect with driving source low-pressure side；
By low-resistivity layer shielding ring be applied to XLPE cable both ends along face, and draw wiring, connect with driving source low-pressure side；
Low-resistivity layer shielding line is wound on the connecting line of test loop, the low resistance conductive ring of closure is formed.
4. a kind of electromagnetism interference method based on XLPE cable insulation detection device, the XLPE cable insulation detection device packet
It includes: driving source, current measurement module, low-resistivity layer shielding line, faraday cup, XLPE cable, metal screen layer and two low-resistivity layer shieldings
Ring；It is characterized in that, the electromagnetism interference method includes the following steps:
Circuit is measured to current measurement module floating type, current measurement module is placed in faraday cup, faraday cup and the earth
Connection；
By driving source High voltage output, by having, the cable of high insulation passes through faraday cup and current measurement module electric current enters end
It is reliably connected, current measurement module electric current outlet is connected with XLPE cable core, by XLPE cable metal screen layer and greatly
Ground is reliably connected, and driving source low-pressure side is connect with the earth；
By low-resistivity layer shielding ring be applied to XLPE cable both ends along face, and draw wiring, connect with driving source high-pressure side；
Low-resistivity layer shielding line is wound on the connecting line of test loop, the low resistance conductive ring of closure is formed.
5. electromagnetism interference method according to any one of claims 1-4, which is characterized in that wound using low-resistivity layer shielding line
When forming low resistance conductive ring, the low resistance conductive anchor ring product of formation is as close with the area of test loop as possible, reaches and supports as far as possible
Disappear the purpose of external magnetic field.
6. electromagnetism interference method according to any one of claims 1-4, which is characterized in that apply using low-resistivity layer shielding ring
When XLPE cable both ends are along face, low-resistivity layer shielding ring used is the flexible low-resistance belt with favorable elasticity, real by being closely wound
Now the influence along face leakage current to measurement result is avoided along the purpose of face rigid contact with cable.
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| CN107192918B (en) * | 2017-05-29 | 2019-07-12 | 西南交通大学 | Leakage current testing System and method for of vehicle-mounted cable termination at a temperature of particular surroundings |
| CN110231511B (en) * | 2019-07-05 | 2021-06-29 | 上海交通大学 | Isothermal relaxation current detection device based on separation measurement loop method |
| CN111736043A (en) * | 2020-06-19 | 2020-10-02 | 西安交通大学 | XLPE cable degassing state evaluation method based on low-frequency dielectric spectrum |
| CN113075507A (en) * | 2021-03-29 | 2021-07-06 | 云南电网有限责任公司曲靖麒麟供电局 | High-voltage measuring device |
| CN113917195B (en) * | 2021-09-13 | 2022-11-11 | 华中科技大学 | Cable insulation diagnostic device anchor clamps of anti-electromagnetic interference |
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| CN105467190A (en) * | 2015-11-13 | 2016-04-06 | 华中科技大学 | Measuring method of XLPE cable polarized-depolarized currents |
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| CN103543321A (en) * | 2013-09-24 | 2014-01-29 | 华中科技大学 | Polarization-depolarization current detection device for crosslinked polyethylene medium-voltage cable |
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