CN108037376A - A kind of power distribution network cable connector electric field strength detection device - Google Patents
A kind of power distribution network cable connector electric field strength detection device Download PDFInfo
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- CN108037376A CN108037376A CN201711279007.1A CN201711279007A CN108037376A CN 108037376 A CN108037376 A CN 108037376A CN 201711279007 A CN201711279007 A CN 201711279007A CN 108037376 A CN108037376 A CN 108037376A
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- electric field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention proposes a kind of power distribution network cable connector electric field strength detection device, including electric field strength transducer[sensor, signal amplitude adjustment module, differential amplification filter module, A/D module, the electric field intensity signal collected is sent to the adjustment of the signal amplitude adjustment module progress signal amplitude by the electric field strength transducer[sensor, signal after range-adjusting passes through the lifting of the laggard line level of differential amplification filter module, after being transformed to digital signal eventually through the A/D module, exported by antenna.The present invention is based on sensor technology, detects the electric field strength of power distribution network middle cable connector, and the insulation performance and failure predication to cable connector provide judgment basis, have great Practical significance.
Description
Technical field
The invention belongs to power cable technical field, and in particular to a kind of power distribution network cable connector electric field strength detection dress
Put.
Background technology
As China's economy further develops, Development of China's Urbanization persistently accelerates, and polythene material Cross-linked technique is not in addition
It is broken into ripe, crosslinked polyethylene（XLPE）Power cable relies on its excellent mechanical performance and good insulation characterisitic, obtains wide
For accreditation, largely used in power industry.At the same time, the transition joint supporting with power cable is also largely using.
Its reason is that length has been definite value when power cable dispatches from the factory, and needs to be sheared during construction laying at the scene, and connect with cable
Head is connected cable.However, beginning to use so far from power cable, it is still in power supply system center tap in circuit
Most weak link.Resulting personal injury, property loss are commonplace.At present, used in 110kV transmission lines of electricity
Intermediate joint of electric cable majority is with silicon rubber（SIR）Made for main material.The reality of power cable on-line operation
Experience have shown that the interface between cable insulation and splice insulation layer is easiest to that disruptive discharge phenomenon occurs.By actual installation
Code is understood, when cable accessory is installed, cable metallic screens layer, outer semiconducting layer, interior semi-conductive layer need to be pressed specific length
Stripping successively.The stress of section is changed during stripping, so as to cause to show non-uniform Distribution in fracture section part current potential.Electricity
Electric field component includes radial component and axial component in cable, and different degrees of non-uniform electric is all showed in joint
Situation, and equipotential area distortion is serious.Field strength distribution is uneven, excessively concentrates, can all trigger partial discharge phenomenon.
Actual motion failure shows have excessively between the reason for punch-through occurs for XLPE-SIR joint interfaces mainly interface
Air gap exists and the residual of conductive bits.The friction that major embodiment leaves on interface when mounted scratches, remaining semiconductive
Layer particulate or conductive micro- bits participate in insulator interface, and remaining burr of conductor sections etc..But how breakdown connector is
, wherein puncturing the rule of development with process still without final conclusion.According to reality, it is necessary to probe into furtherly interfacial air gap,
The influences of the principal element to interface breakdown process such as the micro- bits of interfacial conductive and thus caused tracking failure characteristic.Among diagnosis
The reason for connector breakdown fault, so as to improve connector design, the installation of specification connector, and then improve the transmission of electric system electric energy
Security and stability, have important practical value and realistic meaning.
The content of the invention
The present invention accurately measures cable connector in view of the above-mentioned problems, propose a kind of distribution network cable connector electric field detector
Partial electric-field index；It is proposed a kind of sensor technology suitable for the detection of distribution network cable connector electric field and connect for distribution network cable
Mechanical structure, device and the bayonet of head electric field detection.
Technical scheme is as follows：
A kind of electric field strength detection device, including electric field strength transducer[sensor, signal amplitude adjustment module, differential amplification filtering mould
Block, A/D module, it is characterised in that the electric field strength transducer[sensor sends the electric field intensity signal collected to the signal width
Value adjustment module carries out the adjustment of signal amplitude, and the signal after range-adjusting is laggard by the differential amplification filter module
The lifting of line level, after being transformed to digital signal eventually through the A/D module, is exported by antenna.
The differential amplification filter module includes two-stage, per level-one all comprising a differential amplification module and a filtering mould
Block, signal pass through the differential amplification module in the first order, the filter module in the first order, the differential amplification mould in the second level successively
Exported after filter module in block, the second level to late-class circuit.
The signal of filter module output in the first order is also by being directly output to the second level after integrating circuit
In filter module；Described export is exported to the A/D module to the signal of late-class circuit by integrating circuit.
The electric field strength detection device is used for the electric field strength for detecting power distribution network middle cable connector, and the electric field strength passes
The output signal of sensor has evaded the influence that the electric field strength transducer[sensor is produced to being tested electric field.
The electric field strength detection device is used for the electric field strength for detecting power distribution network middle cable connector, and the electric field strength passes
Sensor uses non-contact detecting, can shield influence of the surrounding environment to the electric field strength transducer[sensor.
The electric field strength detection device is designed using cavity, and is installed on using snap fit on the cable connector.
The present invention has the following advantages：
The present invention is based on sensor technology, detects the electric field strength of power distribution network middle cable connector, the insulation performance to cable connector
Judgment basis is provided with failure predication, there is great Practical significance.
Brief description of the drawings
Fig. 1 is electric field strength detection device hardware circuit diagram；
Fig. 2 is electric field strength detection device outside drawing；
Fig. 3 sensor equivalent circuit models.
Embodiment
Below in conjunction with specific embodiment, the present invention will be described, and each embodiment is merely to illustrate the technical side of the present invention
Case, rather than its limitations.
Electric field strength detection device hardware circuit, will as shown in Figure 1, mainly realize the collection and processing to sensor signal
Analog-signal transitions is digital signals and are transmitted to host computer and are calculated and shown.Including electric field strength transducer[sensor, signal width
Value adjustment module, differential amplification filter module, A/D module, the electric field strength transducer[sensor are divided into steady-state field sensor and transient state
Electric-field sensor, sensor send the electric field intensity signal collected to the signal amplitude adjustment module and carry out signal amplitude
Adjustment, signal after range-adjusting passes through the lifting of the laggard line level of differential amplification filter module, eventually through
After the A/D module is transformed to digital signal, exported by antenna.The differential amplification filter module includes two-stage, per level-one all
Comprising a differential amplification module and a filter module, signal passes through differential amplification module, the first order in the first order successively
In filter module, the differential amplification module in the second level, exported after the filter module in the second level to late-class circuit.The first order
In filter module output filter module of the signal also by being directly output to after integrating circuit in the second level；It is described defeated
Go out and exported to the signal of late-class circuit by integrating circuit to the A/D module.A/D module is integrated in zigbee communication modules,
After digitlization, signal is launched finally by antenna, realizes long-range monitoring；Whole hardware system is supplied using battery
Electricity, battery powered obtain energy by CT taking energy coils from cable, are provided after power circuit rectification, filtering and voltage stabilizing.Electricity
Field intensity detection device（RSM）Wirelessly transfer data to wireless cascade repeater（WRM）, repeater（WRM）Will
Electric field strength detection device data summarization is transferred to the handheld terminal of distal end after merging（MTU）Receiving device.
In conduit line or tunnel, there are tens of live line work cables, there are electric field between cable and cable.For
How tested cable other coupled electric fields except own electric field also has, shield these coupled electric fields, and accurately measure existing cable
The electric field distribution of connector is, it is necessary to which designing one kind has shielding coupled electric field, is easily installed electric field detecting structure.Electric field strength detects
As shown in Fig. 2, device housings are designed using the high material internal of conductivity using cavity, shielding external electrical field disturbs device appearance
Signal ensures influence of the external electrical field for test sensor, using on snap fit installation and cable connector.The sensing utensil
There are the reliably working ability in the case of alternating electric field, non-uniform electric field, frequency change, electric microfield and high-intensity magnetic field, and measuring accuracy
It is high, low in energy consumption, technique is simple.Whole monitoring system uses " non-contact detecting " technology, and the installation of sensor and whole system, adjust
Examination does not influence the normal operation of cable at all, is adapted under high voltage, strong-electromagnetic field bad electromagnetic environment or hot environment to cable
The operation insulation state monitoring of connector.Sensor, which uses, has high-resolution 360 ° full encirclement modes, can be conveniently mounted at
Device external, does not impact equipment.
When tested electric field region introduces any object, no matter object is conductor or non-conductor, can all influence original
Electric field is distributed, and results even in the distortion of tested electric field.If the electric field being affected is in the position of required detection and original electricity
Field remain to keep linear relationship, although the then change for causing tested electric field of sensor, change after electric field and
Electric field before change is linearly related, therefore the present invention carries out ratiometric conversion on the signal of detection, realizes to original electricity
The detection of field.
The core component that electric-field sensor is detected as cable electric field, is mainly used for perceiving the change of cable connector exocuticle electric field
Change situation, the present invention carry out small-sized encapsulated on the basis of existing sensor senses precision is improved, to equipment, and measurement accuracy is
10V/m, to achieve the purpose that sensitive identification electric field change.Sensor circuit model is as shown in figure 3, the sensor uses double electricity
Pole, the electric-field sensor of current potential differential type output.Using a pair based on induction electrode of the conductor of principle of induction as sensor,
And using the difference of the floating potential of electrode as detection signal output, wherein φ (t) is measured conductor equivalent voltage source, Ca, Cb
The equivalent mutual capacitance between induction electrode and test line, stray capacitance, Cab are electrode over the ground for induction electrode by Can, Cbn
Between mutual capacitance, Rm is detection resistance.Since the presence of mutual capacitance between induction electrode can be effectively improved sensor internal electricity
The distribution of field, simultaneously because sensor does not have grounded part using the output of differential type floating potential as detection signal, sensor,
Hence in so that sensor insulating Design is simple and can apply to the high detection zone of electric field strength.
Since the presence of mutual capacitance between induction electrode can be effectively improved the distribution of sensor internal electric field, simultaneously because
Sensor is using the output of differential type floating potential as detection signal, and sensor does not have grounded part, hence in so that sensor is exhausted
Edge design is simple and can apply to the high detection zone of electric field strength.
Using the electric-field sensor structure determination of double-induction pole, differential type signal output it is good after, the knot of its induction electrode
Structure is just decided, i.e., the mutual capacitance Cab between induction electrode is determined, after the mounting means of sensor is determined, sensing
Equivalent mutual capacitance Ca and Cb between electrode and test line is also determined therewith.Understand to influence sensor amplitude versus frequency characte at this time
There was only sensor sensing electrode and stray capacitance Can and Cbn over the ground with the factor of phase-frequency characteristic, this is because Can with
Cbn can change with the change of the factors such as the setting height(from bottom) of sensor, and the measurement error of sensor is mainly by sensor at this time
Stray capacitance produces induction electrode over the ground.
Therefore need to avoid the situation of Ca Cbn=Cb Can formulas to occur during formula voltage sensor design on the scene.Electric field passes
During the structure that sensor is exported using double-induction pole, floating potential differential type, on the basis of traditional electric-field sensor transmission function
On introduce mutual capacitance Cab between electrode, and as the increase of Cab, the performance of sensor can be lifted as follows： ①
With the increase of Cab, sensor can operate at the pattern from integration;2. with the increase of Cab, it is possible to increase sensor
Intrinsic standoff ratio;3. with the increase of Cab, the phase error between sensor output signal and measured signal can be reduced;4. with
The increase of Cab, can reducing induction electrode, stray capacitance measures sensor caused influence over the ground.
Finally it should be noted that：Above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：
It can still modify the technical solution described in previous embodiment, or to which part or all technical characteristic into
Row equivalent substitution；And these modifications or substitutions, the essence of appropriate technical solution is departed from various embodiments of the present invention technical side
The scope of case.
Claims (6)
1. a kind of electric field strength detection device, including electric field strength transducer[sensor, signal amplitude adjustment module, differential amplification filtering mould
Block, A/D module, it is characterised in that the electric field strength transducer[sensor sends the electric field intensity signal collected to the signal width
Value adjustment module carries out the adjustment of signal amplitude, and the signal after range-adjusting is laggard by the differential amplification filter module
The lifting of line level, after being transformed to digital signal eventually through the A/D module, is exported by antenna.
2. electric field strength detection device according to claim 1, it is characterised in that the differential amplification filter module includes
Two-stage, a differential amplification module and a filter module are all included per level-one, and the difference that signal passes through in the first order successively is put
Filter module in big module, the first order, the differential amplification module in the second level, export to after after the filter module in the second level
Level circuit.
3. electric field strength detection device according to claim 2, it is characterised in that the filter module in the first order is defeated
Filter module of the signal gone out also by being directly output to after integrating circuit in the second level；It is described to export to late-class circuit
Signal is exported to the A/D module by integrating circuit.
4. electric field strength detection device according to claim 1, it is characterised in that the electric field strength detection device is used for
The electric field strength of power distribution network middle cable connector is detected, the output signal of the electric field strength transducer[sensor has evaded the electric field strength
The influence that sensor is produced to being tested electric field.
5. electric field strength detection device according to claim 1, it is characterised in that the electric field strength detection device is used for
The electric field strength of power distribution network middle cable connector is detected, the electric field strength transducer[sensor uses non-contact detecting, can shield surrounding
Influence of the environment to the electric field strength transducer[sensor.
6. electric field strength detection device according to claim 5, it is characterised in that the electric field strength detection device uses
Cavity designs, and is installed on using snap fit on the cable connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279007.1A CN108037376A (en) | 2017-12-06 | 2017-12-06 | A kind of power distribution network cable connector electric field strength detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279007.1A CN108037376A (en) | 2017-12-06 | 2017-12-06 | A kind of power distribution network cable connector electric field strength detection device |
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| Publication Number | Publication Date |
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| CN108037376A true CN108037376A (en) | 2018-05-15 |
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| CN201711279007.1A Pending CN108037376A (en) | 2017-12-06 | 2017-12-06 | A kind of power distribution network cable connector electric field strength detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109324236A (en) * | 2018-09-29 | 2019-02-12 | 国网山西省电力公司太原供电公司 | A kind of assessment of fault method based on cable connector typical defect |
| CN109324235A (en) * | 2018-09-29 | 2019-02-12 | 国网山西省电力公司太原供电公司 | A kind of sensor device of cable connector electric field detection |
| CN113671325A (en) * | 2021-08-18 | 2021-11-19 | 云南电网有限责任公司大理供电局 | Terminal partial discharge monitoring method and system based on high-frequency electric field change |
| CN117192233A (en) * | 2023-08-30 | 2023-12-08 | 南方电网数字电网研究院有限公司 | Non-contact differential electric field sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109324236A (en) * | 2018-09-29 | 2019-02-12 | 国网山西省电力公司太原供电公司 | A kind of assessment of fault method based on cable connector typical defect |
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| CN113671325A (en) * | 2021-08-18 | 2021-11-19 | 云南电网有限责任公司大理供电局 | Terminal partial discharge monitoring method and system based on high-frequency electric field change |
| CN117192233A (en) * | 2023-08-30 | 2023-12-08 | 南方电网数字电网研究院有限公司 | Non-contact differential electric field sensor |
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Application publication date: 20180515 |