CN106291250A - High-voltage cable insulating runs detecting system - Google Patents
High-voltage cable insulating runs detecting system Download PDFInfo
- Publication number
- CN106291250A CN106291250A CN201610790011.3A CN201610790011A CN106291250A CN 106291250 A CN106291250 A CN 106291250A CN 201610790011 A CN201610790011 A CN 201610790011A CN 106291250 A CN106291250 A CN 106291250A
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- China
- Prior art keywords
- resistance
- voltage
- electric capacity
- operational amplifier
- detection circuit
- 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.)
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Classifications
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention discloses a kind of high-voltage cable insulating and run detecting system, including vibration wave generation circuit, voltage-dividing detection circuit and control unit；Voltage-dividing detection circuit includes low pass filter, band filter, partial pressure unit and impedance detection circuit；Low pass filter includes that the first resistance is to the 5th resistance, first electric capacity, second electric capacity and operational amplifier, first resistance is connected with one end of the second resistance and one end of the 4th resistance respectively, the other end of the second resistance is connected with one end of the second electric capacity and one end of the 5th resistance respectively, the other end of the 4th resistance is connected with the outfan of described operational amplifier by the first electric capacity, the other end ground connection of the second electric capacity, the other end of the 5th resistance is connected with the in-phase input end of operational amplifier, the inverting input of operational amplifier is connected with its outfan, the input of operational amplifier and the 3rd resistance connect.The small volume of the present invention, be easy to carry, circuit structure is simple, cost is relatively low, ensure that circuit output signal is undistorted.
Description
Technical field
The present invention relates to cable insulation detection field, run detecting system particularly to a kind of high-voltage cable insulating.
Background technology
Twisted polyethylene cable becomes cable development and the main flow of engineer applied.Currently, state's inner cable has run department
High pressure, ultra-high voltage cross-linking cable commissioning test and the diagnostic test after putting into operation are paid much attention to, takes multiple detection means
Try hard to guarantee the operational reliability of cable with method.Damp oscillatory wave detection technique is the one that recent domestic is paid close attention to
For the new technique of the detection of crosslinked cable scene insulating properties with diagnosis, state's inner cable operation, test unit are successively from abroad
Introducing test system based on this technology, and carried out actual application at distribution midium voltage cable circuit, on-the-spot discovery dissection are tested
Demonstrate,prove because manufacturing, lay, install all kinds of defects caused, achieved good effect.But, existing high-voltage cable insulating is transported
Row detection equipment volume is relatively big, not readily portable.
High-voltage cable insulating runs detection equipment and is provided with dividing potential drop detector unit, and the filter circuit in dividing potential drop detector unit is very
The most commonly used many passive impedance network constitute simple filter circuits, though its cost is low, but filter effect bad.Separately
Outward, although digital filtering can obtain the filter effect that precision is good, but its system complex, high cost.In signal transmission
In circuit, all there is the signals such as harmonic wave, clutter, interference, cause in signal output procedure and distortion phenomenon occurs.
Summary of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, it is provided that a kind of small volume, just
In carrying, circuit structure is simple, cost is relatively low, ensure the distortionless high-voltage cable insulating of circuit output signal runs detection system
System.
The technical solution adopted for the present invention to solve the technical problems is: a kind of high-voltage cable insulating of structure runs detection system
System, including vibration wave generation circuit, voltage-dividing detection circuit and control unit, described vibration wave generation circuit includes high voltage direct current
Source, solid high-voltage switch, air core inductor and high tension cable, the positive pole of described high-voltage DC power supply passes through described air core inductor and institute
The one end stating high tension cable connects, the other end ground connection of described high tension cable, one end of described solid high-voltage switch and described height
The positive pole of pressure DC source connects, the other end ground connection of described solid high-voltage switch, one end of described voltage-dividing detection circuit and institute
The one end stating high tension cable connects, and the other end of described voltage-dividing detection circuit is connected with described control unit, described control unit
Switch with described high-voltage DC power supply and solid high-voltage the most respectively and be connected；
Described voltage-dividing detection circuit includes low pass filter, band filter, partial pressure unit and impedance detection circuit, described
One end of partial pressure unit is connected with one end of described high tension cable, and the other end of described partial pressure unit is by described impedance detection electricity
Road ground connection, described low pass filter is connected with described partial pressure unit, for isolating the voltage signal of described high tension cable and passing
Delivering to described control unit, described band filter is connected with described impedance detection circuit, is used for isolating described high tension cable
Partial discharge signal and be sent to described control unit；
Described low pass filter includes the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electricity
Hold, the second electric capacity and operational amplifier, described first resistance respectively with one end and one end of the 4th resistance of described second resistance
Connecting, the other end of described second resistance is connected with one end of described second electric capacity and one end of the 5th resistance respectively, and described the
The other end of four resistance is connected with the outfan of described operational amplifier by described first electric capacity, another of described second electric capacity
End connects reference potential, and the described other end of the 5th resistance is connected with the in-phase input end of described operational amplifier, described computing
The inverting input of amplifier is connected with its outfan, and the outfan of described operational amplifier is connected with described 3rd resistance.
In high-voltage cable insulating of the present invention runs detecting system, described low pass filter also includes the 6th electricity
Resistance, the reverse input end of described operational amplifier is connected with its outfan by described 6th resistance.
In high-voltage cable insulating of the present invention runs detecting system, described low pass filter also includes the 7th electricity
Resistance, a pin of described operational amplifier is connected with described high-voltage DC power supply by described 7th resistance.
In high-voltage cable insulating of the present invention runs detecting system, described low pass filter also includes the 8th electricity
Resistance, another pin of described operational amplifier connects described reference potential by described 8th resistance.
In high-voltage cable insulating of the present invention runs detecting system, described partial pressure unit includes the first dividing potential drop electricity
Resistance, the second divider resistance, the first derided capacitors and the second derided capacitors, one end of described first divider resistance and the first dividing potential drop electricity
All one end with described high tension cable, the one end held are connected, the other end of described first divider resistance and described second divider resistance
One end connect, the other end of described first derided capacitors is respectively with one end of described second derided capacitors and low pass filter even
Connect, after the other end of described second divider resistance is connected with the other end of described second derided capacitors, and lead to described band respectively
Wave filter and impedance detection circuit connect, the ratio of the resistance of the resistance of described first divider resistance and described second divider resistance
Ratio equal to the impedance of described first derided capacitors Yu the impedance of described second derided capacitors.
In high-voltage cable insulating of the present invention runs detecting system, described impedance detection circuit includes detecting resistance
With detection electric capacity, described detection resistance is in parallel with detection electric capacity, one end of its parallel connection filter logical with described partial pressure unit and band respectively
Ripple device connects, and the other end in parallel is connected with described band filter, the other end also ground connection in parallel.
The high-voltage cable insulating implementing the present invention runs detecting system, has the advantages that owing to being provided with the wave of oscillation
There is circuit, voltage-dividing detection circuit and control unit, use the insulating properties of oscillating wave voltage testing high voltage cable, wave of oscillation electricity
Pressing detecting device volume is little, it is simple to carry, and the circuit structure of low pass filter is simple, low cost, it is possible to resisting harmonic, clutter and
The signals such as interference, it is ensured that circuit output signal is undistorted；So its small volume, be easy to carry, circuit structure is simple, cost relatively
Low, ensure circuit output signal undistorted.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation that high-voltage cable insulating of the present invention runs in one embodiment of detecting system；
Fig. 2 is the electrical block diagram of voltage-dividing detection circuit in described embodiment；
Fig. 3 is the electrical block diagram of low pass filter in described embodiment.
Detailed description of the invention
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
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
In high-voltage cable insulating of the present invention runs detecting system embodiment, this high-voltage cable insulating runs detecting system
Structural representation is as shown in Figure 1.In Fig. 1, high-voltage cable insulating runs detecting system and includes vibrate wave generation circuit 1, dividing potential drop inspection
Slowdown monitoring circuit 2 and control unit 3, vibration wave generation circuit 1 includes that high-voltage DC power supply Uh, solid high-voltage switch S, air core inductor L
With high tension cable (that draw in figure is the survey testing capacitor Ct of high tension cable), the positive pole of high-voltage DC power supply Uh passes through hollow electricity
Sense L is connected with one end of high tension cable, the other end ground connection of high tension cable, one end of solid high-voltage switch S and high voltage direct current
The positive pole of source Uh connects, the other end ground connection of solid high-voltage switch S, one end of voltage-dividing detection circuit 2 and one end of high tension cable
Connect, the other end of voltage-dividing detection circuit 2 is connected with control unit 3, control unit 3 the most respectively with high-voltage DC power supply Uh and consolidate
State high-voltage switch gear S connects.
Solid high-voltage switch S is held off, and high-voltage DC power supply Uh first passes through LINEAR CONTINUOUS boosting mode to high-tension electricity
The testing capacitor Ct of cable carries out LINEAR CONTINUOUS charging, after being allowed to boost to preset value 150kV, now, and solid high-voltage switch S tolerance
The DC voltage of 150kV, solid high-voltage switch S closes in 1us so that in the testing capacitor Ct of high tension cable and test loop
Air core inductor L-shaped become loop, thus produce resonance, thus on the testing capacitor Ct of high tension cable, produce oscillating AC electricity
Pressure, owing to high tension cable there is also resistive, the amplitude of oscillation AC voltage progressively reduces, until being zero, the persistent period is ms level.
Fig. 2 is the electrical block diagram of voltage-dividing detection circuit in the present embodiment.In Fig. 2, voltage-dividing detection circuit 2 includes low
Bandpass filter, band filter, partial pressure unit Ck and impedance detection circuit Zd, one end of partial pressure unit Ck is with high tension cable Uc's
One end connects, and the other end of partial pressure unit Ck passes through impedance detection circuit Zd ground connection, low pass filter is connected with partial pressure unit Ck,
For isolating the voltage signal (specifically isolating the component signal Uc1 of the voltage Uc of high tension cable) of high tension cable and transmitting
To control unit 3, band filter is connected with impedance detection circuit Zd, for isolating the Partial discharge signal Upd of high tension cable also
It is sent to control unit 3.The low-pass cut-off frequencies of low pass filter is 300～1000Hz, the low pass cutoff frequency of band filter
Rate is 50k-100kHz, and high pass cut off frequency is 1M～20MHz.Partial pressure unit Ck can be equivalent to couple electric capacity.The present invention uses
The insulating properties of oscillating wave voltage testing high voltage cable, oscillating wave voltage test equipment volume is little, it is simple to carry；Use and integrally set
The voltage-dividing detection circuit 2 of meter, coupling electric capacity can be used for dividing potential drop, and effect is notable.
Control unit 3 controls the letter of high-voltage DC power supply Uh according to the component signal Uc1 of the voltage Uc of high tension cable, output
Number so that the voltage Uc of high tension cable uniformly raises, and i.e. makes the boost current of high tension cable keep constant；When high tension cable
After voltage Uc reaches setting value, controlling solid high-voltage switch S conducting, the testing capacitor Ct of air core inductor L and high tension cable is formed
The wave of oscillation；Partial discharge signal Upd is used for calculating the partial discharge quantity of high tension cable.
Fig. 3 is the electrical block diagram of low pass filter in the present embodiment, and in Fig. 3, low pass filter includes the first electricity
Resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1, the second electric capacity C3 and computing
Amplifier A, wherein, the first resistance R1 is connected with one end of the second resistance R2 and one end of the 4th resistance R4 respectively, the second resistance
The other end of R2 is connected with one end of the second electric capacity C2 and one end of the 5th resistance R5 respectively, and the other end of the 4th resistance R4 passes through
First electric capacity C1 is connected with the outfan of operational amplifier A, and the other end of the second electric capacity C2 connects reference potential, the 5th resistance R5
The other end be connected with the in-phase input end of operational amplifier A, the inverting input of operational amplifier A is connected with its outfan,
The outfan of operational amplifier A and the 3rd resistance R3 connect.
Above-mentioned first resistance R1 is also connected with partial pressure unit Ck, and the 3rd resistance R3 is also connected with control unit 3.First resistance R1 and
First electric capacity C1 forms first order feed-back filtering, and the second resistance R2 and the second electric capacity C2 forms two grades of bypass filtering.4th resistance R4
It is current-limiting resistance with the 5th resistance R5, is used for carrying out overcurrent protection.The circuit structure of this low pass filter is simple, and cost is relatively
Low, it is possible to the signals such as resisting harmonic, clutter, interference, it is ensured that circuit output signal is undistorted.
In the present embodiment, low pass filter also includes the 6th resistance R6, and the reverse input end of operational amplifier A passes through the 6th
Resistance R6 is connected with its outfan.6th resistance R6 is current-limiting resistance, for carrying out overcurrent protection further.This low pass filter
Also including the 7th resistance R7, a pin of operational amplifier A is connected with high-voltage DC power supply Uh by the 7th resistance R7.7th electricity
Resistance R7 is current-limiting resistance, for the overcurrent protection of further accentuator.This low pass filter also includes the 8th resistance R8, computing
Another pin of amplifier A connects reference potential by the 8th resistance R8, and the 8th resistance R8 is current-limiting resistance, for making circuit
Overcurrent protection effect reaches optimal.
As in figure 2 it is shown, in the present embodiment, partial pressure unit Ck include the first divider resistance Ru1, the second divider resistance Ru2,
One end of one derided capacitors Cu1 and the second derided capacitors Cu2, the first divider resistance Ru1 and one end of the first derided capacitors Cu1 are equal
Being connected with one end of high tension cable, the other end of the first divider resistance Ru1 and one end of the second divider resistance Ru2 connect, and first
The other end of derided capacitors Cu1 is connected with one end and the low pass filter of the second derided capacitors Cu2 respectively, the second divider resistance
After the other end of the other end of Ru2 and the second derided capacitors Cu2 connects, and respectively with band filter and impedance detection circuit Zd
Connect.It is noted that the resistance that the resistance of the first divider resistance Ru1 is much larger than the second divider resistance Ru2, the first dividing potential drop electricity
Hold the capacitance capacitance much smaller than the second derided capacitors Cu2 of Cu1.The resistance of the first divider resistance Ru1 and the second divider resistance Ru2
The ratio of impedance equal to impedance and the second derided capacitors Cu2 of the first derided capacitors Cu1 of the ratio of resistance.Partial pressure unit Ck
First derided capacitors the first derided capacitors Cu1 can be equivalent to, there is the effect of coupling electric capacity.During low frequency, impedance is big, hinders during high frequency
Anti-low, hinder low frequency signal, by high-frequency signal, in the wave of oscillation 20～300Hz, obvious to the inhibitory action of oscillating voltage.
In the present embodiment, impedance detection circuit 2 includes detecting resistance Rd and detection electric capacity Cd, detection resistance Rd and detection electricity
Holding Cd in parallel, one end of its parallel connection is connected with partial pressure unit Ck and band filter respectively, the other end in parallel and bandpass filtering
Device connects, the other end also ground connection in parallel.
In a word, in the present embodiment, high-voltage DC power supply Uh passes through LINEAR CONTINUOUS boosting mode to being test for high-tension electricity
Cable progressively charges, and after being allowed to boost to preset value, solid high-voltage switch S closes in 1us so that the test of high tension cable
Electric capacity Ct and air core inductor L produces oscillating tank, and partial pressure unit Ck is by the voltage of low pass filter post-sampling to high tension cable
The component signal Uc1 of Uc, impedance detection circuit Zd are by the Partial discharge signal Upd of band filter post-sampling to high tension cable, high
The component signal Uc1 and Partial discharge signal Upd of the voltage Uc of voltage cable are passed in control unit 3.This high-voltage cable insulating runs
The simple in construction of detecting system, can effectively detect the insulating properties of high tension cable.The circuit structure of low pass filter is simple, cost
Relatively low, it is possible to the signals such as resisting harmonic, clutter, interference, it is ensured that circuit output signal is undistorted.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (6)
1. a high-voltage cable insulating runs detecting system, it is characterised in that include vibrate wave generation circuit, voltage-dividing detection circuit
And control unit, described vibration wave generation circuit includes high-voltage DC power supply, solid high-voltage switch, air core inductor and high-tension electricity
Cable, the positive pole of described high-voltage DC power supply is connected with one end of described high tension cable by described air core inductor, described high-tension electricity
The other end ground connection of cable, one end of described solid high-voltage switch is connected with the positive pole of described high-voltage DC power supply, and described solid-state is high
The other end ground connection compressed switch, one end of described voltage-dividing detection circuit is connected with one end of described high tension cable, and described dividing potential drop is examined
The other end of slowdown monitoring circuit is connected with described control unit, and described control unit is high with described high-voltage DC power supply and solid-state the most respectively
Compress switch connection；
Described voltage-dividing detection circuit includes low pass filter, band filter, partial pressure unit and impedance detection circuit, described dividing potential drop
One end of unit is connected with one end of described high tension cable, and the other end of described partial pressure unit is connect by described impedance detection circuit
Ground, described low pass filter is connected with described partial pressure unit, for isolating the voltage signal of described high tension cable and being sent to
Described control unit, described band filter is connected with described impedance detection circuit, for isolating the office of described high tension cable
Discharge signal is also sent to described control unit；
Described low pass filter include the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity,
Second electric capacity and operational amplifier, described first resistance connects with one end of described second resistance and one end of the 4th resistance respectively
Connecing, the other end of described second resistance is connected with one end of described second electric capacity and one end of the 5th resistance respectively, and the described 4th
The other end of resistance is connected with the outfan of described operational amplifier by described first electric capacity, the other end of described second electric capacity
Connecting reference potential, the described other end of the 5th resistance is connected with the in-phase input end of described operational amplifier, and described computing is put
The inverting input of big device is connected with its outfan, and the outfan of described operational amplifier is connected with described 3rd resistance.
High-voltage cable insulating the most according to claim 1 runs detecting system, it is characterised in that described low pass filter is also
Including the 6th resistance, the reverse input end of described operational amplifier is connected with its outfan by described 6th resistance.
High-voltage cable insulating the most according to claim 2 runs detecting system, it is characterised in that described low pass filter is also
Including the 7th resistance, a pin of described operational amplifier is connected with described high-voltage DC power supply by described 7th resistance.
4. run detecting system according to the high-voltage cable insulating described in claims 1 to 3 any one, it is characterised in that described
Low pass filter also includes the 8th resistance, and another pin of described operational amplifier connects described reference by described 8th resistance
Current potential.
High-voltage cable insulating the most according to claim 4 runs detecting system, it is characterised in that described partial pressure unit includes
First divider resistance, the second divider resistance, the first derided capacitors and the second derided capacitors, one end of described first divider resistance and
All one end with described high tension cable, one end of first derided capacitors are connected, the other end of described first divider resistance and described the
One end of two divider resistances connects, the other end of described first derided capacitors respectively with one end of described second derided capacitors and low
Bandpass filter connects, after the other end of described second divider resistance is connected with the other end of described second derided capacitors, and respectively
It is connected with described band filter and impedance detection circuit, the resistance of described first divider resistance and described second divider resistance
The ratio of resistance is equal to the ratio of the impedance of described first derided capacitors and the impedance of described second derided capacitors.
High-voltage cable insulating the most according to claim 5 runs detecting system, it is characterised in that described impedance detection circuit
Including detection resistance and detection electric capacity, described detection resistance with detect electric capacity in parallel, one end of its parallel connection respectively with described dividing potential drop
Unit and band filter connect, and the other end in parallel is connected with described band filter, the other end also ground connection in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610790011.3A CN106291250A (en) | 2016-08-30 | 2016-08-30 | High-voltage cable insulating runs detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610790011.3A CN106291250A (en) | 2016-08-30 | 2016-08-30 | High-voltage cable insulating runs detecting system |
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| Publication Number | Publication Date |
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| CN106291250A true CN106291250A (en) | 2017-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610790011.3A Pending CN106291250A (en) | 2016-08-30 | 2016-08-30 | High-voltage cable insulating runs detecting system |
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| CN (1) | CN106291250A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110542878A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | CVT voltage live monitoring device with charging function |
| RU2792304C1 (en) * | 2022-09-26 | 2023-03-21 | Ярослав Кириллович Соломенцев | Insulation resistance measuring device with accelerated charge of network capacitance |
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| CN110542878A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | CVT voltage live monitoring device with charging function |
| RU2792304C1 (en) * | 2022-09-26 | 2023-03-21 | Ярослав Кириллович Соломенцев | Insulation resistance measuring device with accelerated charge of network capacitance |
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Application publication date: 20170104 |