CN109116191A - A kind of test of electric cable stoppage higher hamonic wave and detection system - Google Patents
A kind of test of electric cable stoppage higher hamonic wave and detection system Download PDFInfo
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- CN109116191A CN109116191A CN201811298430.0A CN201811298430A CN109116191A CN 109116191 A CN109116191 A CN 109116191A CN 201811298430 A CN201811298430 A CN 201811298430A CN 109116191 A CN109116191 A CN 109116191A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- Mathematical Physics (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of test of electric cable stoppage higher hamonic wave and detection systems, comprising: cable and connector defective physical model: being used for dummycable defect type；Higher hamonic wave measuring device；The higher hamonic wave characteristic value generated under each dummycable defect type is acquired, and higher hamonic wave database is generated with corresponding dummycable defect type according to the higher hamonic wave characteristic value.The present invention is used for the cable sample detecting of defect fault type, collect enough Test data generation higher hamonic wave databases, can be applied to the defect estimation of power cable system, higher hamonic wave database based on generation, when the harmonic component information for detecting actual cable, it can be mapped to the defect type etc. for matching the cable in database, assessed.
Description
Technical field
The invention belongs to electric power detection device technical fields, and in particular to a kind of test of electric cable stoppage higher hamonic wave and detection
System.
Background technique
China's power outage due to caused by cable fault harm in recent years is huge.Accurate Diagnosis cable operating status is pre-
The important prerequisite of anti-cable fault.
At present there are many cable deterioration state detection methods, such as: direct current method, bridge method, dielectric loss angle tangent method, low frequency
Method, partial discharge monitoring method etc..Various methods are each advantageous, but all more can not comprehensively react the integrality of cable, more
Cable running environment state and remaining life can not be reacted.
For this purpose, there is an urgent need to the diagnostic methods and system of a kind of accurate evaluation cable deterioration state by status assessment personnel.
The present inventor devises a kind of electric cable stoppage assessment system based on higher hamonic wave database, passes through high order
Relationship between harmonic wave and various electric cable stoppages establishes higher hamonic wave database, so that when acquiring certain cable higher harmonic components etc.
Feature, which is input in database, can match cable defect that may be present；And the foundation of the database needs to acquire a large amount of lack
The experiment sample for falling into cable carries out higher hamonic wave detection.
In view of this, the present invention is specifically proposed.
Summary of the invention
The object of the present invention is to provide a kind of test of electric cable stoppage higher hamonic wave and detection systems, are accurate can obtain
Test data, establish higher hamonic wave database.
To achieve the goals above, a kind of cable provided by the invention lacks the test of line higher hamonic wave and detection system, comprising:
Cable and connector defective physical model: it is used for dummycable defect type；
Higher hamonic wave measuring device；The higher hamonic wave characteristic value generated under each dummycable defect type is acquired, and
Higher hamonic wave database is generated with corresponding dummycable defect type according to the higher hamonic wave characteristic value.
Further, above-mentioned cable lacks in the test of line higher hamonic wave and detection system: cable and connector defective physical mould
Type includes test cable and detection circuit；Detection circuit include automatic coupling voltage regulator T1, step-up transformer T2, protective resistance R and
Standard capacitance C and capacitance bridge CB；Automatic coupling voltage regulator T1 is connect with step-up transformer provides AC power source, and both ends of power series connection is protected
Protect resistance R；It is accessed between protective resistance R and capacitance bridge CB after standard capacitance C and test cable are in parallel；Capacitance bridge CB's is defeated
Outlet connects higher hamonic wave measuring device.
Further, above-mentioned cable lacks the test of line higher hamonic wave with detection system, and higher hamonic wave measuring device includes
Dsp chip, current sensor, signal conditioning circuit, A/D sample circuit；The detection circuit output end connects current sensor,
Current sensor connects dsp chip with A/D sample circuit through signal conditioning circuit；It is arranged between current sensor and dsp chip
Excess detector circuit and phase-locking frequency multiplication circuit.
Further, above-mentioned cable lacks the test of line higher hamonic wave with detection system, and the zero cross detection circuit includes:
Sampling resistor is arranged in the output end of current sensor, and the pressure drop of sampling resistor introduces hysteresis loop comparator, the output of hysteresis loop comparator
End is connected to NAND gate Schmidt trigger through clamp circuit.
Further, above-mentioned cable lacks the test of line higher hamonic wave with detection system, and the phase-locking frequency multiplication circuit includes
Phase-locked loop chip, summary counter and low-pass filter；The phase-locked loop chip is that a signal input part meets NOT gate Schmidt
The output end of trigger；Phase-locked loop chip is the input terminal that a signal output end connects summary counter；Times of summary counter
The comparison signal input terminal of frequency signal output end connection phase-locked loop chip；Described in the comparison signal output end of phase-locked loop chip passes through
The control signal input of low-pass filter connection phase-locked loop chip.
Further, above-mentioned cable lacks in the test of line higher hamonic wave and detection system, the higher hamonic wave measuring device
It further include host computer, the harmonic component data of the output dsp chip output inputs host computer, and host computer includes processor and deposits
Reservoir is stored with program in memory, execution when program is run by processor: determining that test cable is fallen vacant sunken type, receiving should
The harmonic component data that test cable detects, and generate higher hamonic wave characteristic value high order corresponding with test cable defect type
Harmonic data library.
Further, above-mentioned cable lacks in the test of line higher hamonic wave and detection system, including test circuit and detection electricity
Road；Detection circuit includes automatic coupling voltage regulator T1, step-up transformer T2, protective resistance R, derided capacitors C1 and derided capacitors C2, coupling
Capacitor Ck is closed, impedance Z m is detected, automatic coupling voltage regulator T1 is connect with step-up transformer provides AC power source, and both ends of power series connection is protected
Protect resistance R；After derided capacitors C1 and derided capacitors C2 series connection and it is connected between protective resistance R and power end, coupling capacitor
After Ck and detection impedance Z m connects and it is connected between protective resistance R and power end；Between protective resistance R and coupling capacitor Ck
Connecting node for accessing test cable, the detection both ends impedance Z m connect higher hamonic wave measuring device.
Further, above-mentioned cable lacks the test of line higher hamonic wave and in detection system, further includes test cable support, surveys
Examination cable bearer includes the lasso that fixed link is connected with fixed link top, and at least two test cable brackets are fixed in a fixed spacing
On bottom plate.
Further, above-mentioned cable lacks in the test of line higher hamonic wave and detection system, the higher hamonic wave measuring device
Including voltage input circuit, the first A/D converter, the first zero-crossing detector, current input circuit, the 2nd A/D converter,
Two zero-crossing detectors, switch, the first FPGA arithmetic unit, the 2nd FPGA arithmetic unit, CPU, display, fixed sample clock hair
Raw device, operation panel；
Voltage input circuit connects the first A/D converter and the first zero crossing (zero cross) detector；Electric current input
The 2nd A/D converter of circuit connection and the second zero-crossing detector, two converters are connected to the first FPGA arithmetic unit, second
FPGA arithmetic unit and fixed sample clock generator；Two zero-crossing detectors are connected to switch；Switch is connected to
Two FPGA arithmetic units；And switch, the first FPGA arithmetic unit, the 2nd FPGA arithmetic unit, display, fixed sample clock occur
Device, operation panel are connected to CPU.
Further, above-mentioned cable lacks the test of line higher hamonic wave with detection system, and higher hamonic wave measuring device includes
The harmonic component data of host computer, the detection of higher hamonic wave measuring device inputs host computer, and host computer includes processor and memory,
It is stored with program in memory, execution when program is run by processor: determining that test cable is fallen vacant sunken type, receive the p-wire
The harmonic component data that cable detects, and generate higher hamonic wave characteristic value higher hamonic wave number corresponding with test cable defect type
According to library.
Cable provided by the invention lacks the test of line higher hamonic wave and detection system, has the following beneficial effects:
Electric cable stoppage higher hamonic wave test provided by the invention and detection system, the cable for defect fault type sample
Detection, collecting enough Test data generation higher hamonic wave databases, being commented with can be applied to the defect of power cable system
Estimate, the higher hamonic wave database based on generation can be mapped in database when the harmonic component information for detecting actual cable
The defect type etc. for matching the cable, is assessed.
Detailed description of the invention
Fig. 1 is the schematic diagram that cable of the present invention lacks line higher hamonic wave test and one embodiment of detection system；
Fig. 2 is the logic diagram of higher hamonic wave measuring device shown in Fig. 1；
Fig. 3 is the circuit diagram of one embodiment of zero cross detection circuit shown in Fig. 2；
Fig. 4 is the schematic diagram of one embodiment of phase-locking frequency multiplication circuit shown in Fig. 2；
Fig. 5 is the schematic diagram that cable of the present invention lacks line higher hamonic wave test and another embodiment of detection system.
Fig. 6 is the logic diagram of higher hamonic wave measuring device shown in Fig. 5
In figure:
1- test cable；2- lasso；3- fixed link；4- bottom plate；5- connector；6- terminal.
Specific embodiment
Combined with specific embodiments below and attached drawing the present invention will be described in detail, in order to which those skilled in the art fill
Sub-argument solution technical solution of the present invention.
A kind of cable lacks the test of line higher hamonic wave and detection system, comprising:
Cable and connector defective physical model: it is used for dummycable defect type；
Higher hamonic wave measuring device；The higher hamonic wave characteristic value generated under each dummycable defect type is acquired, and
Higher hamonic wave database is generated with corresponding dummycable defect type according to the higher hamonic wave characteristic value.
Embodiment 1
In the specific embodiment that cable of the present invention and connector defective physical model provide, as shown in Figure 1, including survey
Cable is tried, to manufacture the cable for having the defects of hot-spot, shelf depreciation, water tree, protective layer damage type.
It further include detection circuit；Detection circuit includes automatic coupling voltage regulator T1, step-up transformer T2, protective resistance R and mark
Pseudo-capacitance C and capacitance bridge CB；Automatic coupling voltage regulator T1 is connect with step-up transformer provides AC power source, both ends of power series connection protection
Resistance R；It is accessed between protective resistance R and capacitance bridge CB after standard capacitance C and test cable are in parallel；The output of capacitance bridge CB
End connection higher hamonic wave measuring device.
As in Figure 2-4, higher hamonic wave measuring device includes dsp chip, current sensor, signal conditioning circuit, A/D
Sample circuit；The detection circuit output end connects current sensor, and current sensor samples electricity through signal conditioning circuit and A/D
Road connects dsp chip；Excess detector circuit and phase-locking frequency multiplication circuit are set between current sensor and dsp chip.
AC power source provides the high-tension current of simulation, and high-tension current passes through standard capacitance C and test cable to capacitance bridge
In CB, capacity current is balanced, and remaining loss current is exported to higher hamonic wave measuring device and handled.Higher hamonic wave is surveyed
Since the signal for measuring device acquisition carries out Fast Fourier Transform (FFT) by conditioning and A/D conversion anger dsp chip, fundamental wave and high order
Harmonic wave separation comes out, and obtains the harmonic component data in relation to defective cable.
To obtain better measurement accuracy, in higher hamonic wave measuring device of the present invention, the current sensor is used
Hall current sensor, the precision such as the LA55-P that LEM company produces, strong antijamming capability, analog signal transformation are higher.Acquisition
Signal inputs dsp chip after analog signal conditioning circuit and the processing of A/D conversion circuit.
Since mains frequency can be fluctuated, and the time-count cycle of timer can't change with the frequency of power grid and be become
Change, when dsp chip issues A/D enabling signal, influences whether the precision of instantaneous reactive algorithm, therefore phase-locking frequency multiplication circuit is set and is sent out
12.8kHz square wave out is as A/D chip sampling control signal.In the embodiment that the present invention provides, dsp chip is used
TMS320F2812 chip when dsp chip CAP4 captures the rising edge of zero cross detection circuit signal, will start CAP5 just to catch
The rising edge of 12.8kHz square wave is obtained, memory is reset, and starts the inquiry of next cycle.
Wherein, the zero cross detection circuit includes: the output end setting sampling resistor of current sensor J, sampling resistor R0
Pressure drop introduce hysteresis loop comparator, the output end of hysteresis loop comparator locks low and high level through clamp circuit, be then attached to
NOT gate Schmidt trigger U3 carries out shaping to output signal；Wherein hysteresis loop comparator by operational amplifier U2 and resistance R7,
R8, R9, R10 composition, operational amplifier such as CA3140 amplifier；Clamp circuit is made of diode D1, D2；The NAND gate is applied
Schmitt trigger preferably uses NAND gate CD4093.
The phase-locking frequency multiplication circuit includes phase-locked loop chip, summary counter and low-pass filter；Phase-locked loop chip is preferred
Using 74HC4046 chip；Summary counter preferably uses CD4040；Low-pass filter is by resistance R11, R12 and capacitor C1 group
At；The signal of sensor acquisition obtains the side 50Hz with sensed current voltage synchronous after zero passage signal detection circuit improves
Wave, this square wave enter No. 14 pins of phase-locked loop chip 74HCA046 as the input signal of phase-locking frequency multiplication circuit, and No. 4 pins are
The output end of chip 74HC4046 internal voltage controlled oscillator, output signal enter No. 10 of binary system summary counter CD4040
Pin carries out 256 times of frequencys multiplication, and frequency-doubled signal is exported from No. 13 pins of binary system summary counter CD4040 enters chip again
No. 3 pins of 74HCA046, i.e. comparison signal input terminal, the phase comparator inside chip 74HCA046 carry out two signals
After phase bit comparison, from No. 13 pin outputs of output end of phase comparator.Low-pass filtered device, after high-frequency noise is filtered out, then
Into the internal voltage controlled oscillator of chip 74HC4046, signal is controlled as it；By constantly adjusting, make output signal frequency
It is 256 times of frequency input signal, and makes input signal and the frequency difference of comparison signal 0.
Dsp chip circuit connection operation panel and display screen carry out control operation and related display.
The harmonic component data of the output dsp chip output inputs host computer, and host computer includes processor and memory,
It is stored with program in memory, execution when program is run by processor: determining that test cable is fallen vacant sunken type, receive the p-wire
The harmonic component data that cable detects, and generate higher hamonic wave characteristic value higher hamonic wave number corresponding with test cable defect type
According to library.
Wherein test cable data type can be input manually into host computer by input equipments such as keyboards.Higher hamonic wave data
The mapping relations of library reaction higher hamonic wave characteristic value and corresponding dummycable defect type.Electric power transmission cable, perfect condition
Under, electric energy can be transported to another place from one place with 100%, the conveying capacity of energy is 100%, and in reality
In operation, due to being influenced by factors such as cable running environment, construction quality and external disturbances, 100% can not be reached
Conveying capacity.When cable occurs aging or defect occurs, energy loss will occur during transportation for electric energy, and with production
Raw higher hamonic wave loss current, the present invention is according to existing for the generation of higher hamonic wave and the aging of power cable and the loss of energy
One-to-one relationship generates database, the assessment for power grid cables defect.For example when aging occurs for cable, locally occurred
Heat directly shows in harmonic component containing ratio, thus when certain subharmonic energy are larger, can be gone out by database matching should
Component malfunction representated by characteristic parameter or failure symptom are prompted.Following table is invention electric current after over-sampling is tested
The corresponding relationship of the fault type of higher hamonic wave and its contribution rate and cable.
The test of cable different parts, including humorous under the different deterioration conditions such as cable body, junction portion, cable passage
The contribution rate of wave component and each harmonic component, corresponding higher hamonic wave main component, relative amount and types of degradation, serious journey out
Mapping relations between degree.
By the study found that the contribution rate of harmonic component caused by cable different faults type and defect type is different
, by taking defect is cracked as an example, 9 subharmonic accounting 33% of harmonic component is found through many experiments, 8 subharmonic accountings 25%, 7 times are humorous
Wave accounting 21%, 10 subharmonic accountings 8%, 6 subharmonic accountings 5%；For being stained 8 subharmonic accountings 35%, 7 subharmonic account for
Than 29%, 9 subharmonic accounting 13%, 10 subharmonic accountings 11%, 6 subharmonic accountings 7% (denominator is harmonic contribution total amount) etc.,
These experimental datas show that different defect and failure have corresponding harmonic component table, i.e. higher hamonic wave and its contribution rate and electricity
The fault type of cable has one-to-one relationship, according to the above-mentioned principle of the present invention, can obtain including providing in above table
The corresponding higher harmonic component of other various electric cable stoppage/fault types and its contribution rate other than defect type.
The detection project that can be carried out based on the above principles includes:
Cable ontology: insulator portion electric discharge, cracking, aging, insulation reduce；Copper wire damage-thermal change type；Line set damage
The defects of bad-immersion/failure；
Coupling part: the defects of end, junction portion electric discharge, (electric leakage) trace, insulation reduce/failure；
Cable passage: the defects of foreign matter, immersion, compressive deformation/failure.
Electric cable stoppage higher hamonic wave test provided by the invention and detection system, can sample into the cable of defect fault type
Detection, collecting enough Test data generation higher hamonic wave databases, being commented with can be applied to the defect of power cable system
Estimate, the higher hamonic wave database based on generation can be mapped in database when the harmonic component information for detecting actual cable
The defect type etc. for matching the cable, is assessed.
Embodiment 2
The present invention also provides system in, provide another embodiment, as shown in Figure 5, cable and defects simulation physics
Model includes test cable bracket, and test cable bracket includes the lasso 2 that fixed link 3 is connected with 3 top of fixed link, and at least two
Test cable bracket is fixed on bottom plate 4 in a fixed spacing, so that test cable 1, which protrudes into two lassos 2 of bracket, to be stablized
It places.Test cable is the cable that manufacture has the defects of hot-spot, shelf depreciation, water tree, protective layer damage type.
It further include detection circuit for being electrically connected test cable and being detected；Detection circuit include automatic coupling voltage regulator T1,
Step-up transformer T2, protective resistance R, derided capacitors C1With derided capacitors C2, coupling capacitor Ck, detect impedance Zm, self-coupling
Device T1 is connect with step-up transformer provides AC power source, both ends of power series connection protective resistance R；Derided capacitors C1With derided capacitors C2
It after series connection and is connected between protective resistance R and power end, coupling capacitor CkWith detection impedance ZmAfter series connection and it is connected in protection
Between resistance R and power end, impedance Z is detectedmPulsed current signal is converted into voltage signal；Protective resistance R and coupled capacitor
Device CkBetween connecting node for accessing test cable, detect impedance ZmBoth ends connect higher hamonic wave measuring device.
The test cable for the defects of making hot-spot, shelf depreciation, water tree, protective layer damage, test cable 1 is by two sections
Composition, centre are connected by connector 5；Test cable 1 is placed in test cable bracket, one terminal 6 of test cable access test electricity
Road is detected after energization using higher hamonic wave measuring device.
As shown in fig. 6, the higher hamonic wave measuring device includes voltage input circuit, the first A/D converter, the one zero friendship
Pitch (zero cross) detector, current input circuit, the 2nd A/D converter, the second zero-crossing detector, switch, first
FPGA arithmetic unit, the 2nd FPGA arithmetic unit, CPU, display, fixed sample clock generator, operation panel,
Voltage input circuit connects the first A/D converter and the first zero crossing (zero cross) detector；Electric current input
The 2nd A/D converter of circuit connection and the second zero-crossing detector, two converters are connected to the first FPGA arithmetic unit, second
FPGA arithmetic unit and fixed sample clock generator；Two zero-crossing detectors are connected to switch；Switch is connected to
Two FPGA arithmetic units；And switch, the first FPGA arithmetic unit, the 2nd FPGA arithmetic unit, display, fixed sample clock occur
Device, operation panel are connected to CPU.
The voltage transformation inputted by voltage input circuit is digital signal by the first A/D converter.The inspection of first zero crossing
The part that device detection analog input signal passes through zero level is surveyed, by detection input voltage from LOW to HIGH or from HIGH to LOW
Variation keeps detection output reversed；The detection output frequency of the zero-crossing detector becomes the basic frequency of input voltage signal.
The current transformation inputted from current input circuit is digital signal by the 2nd A/D converter.Second zero cross detection
Device is the structure for detecting the electric current inputted from current input circuit and passing through zero level, by detection input current from LOW to HIGH
Or change from HIGH to LOW, keep detection output reversed；The detection output frequency of the zero-crossing detector becomes input current signal
Basic frequency.
The transformation data of the instantaneous voltage exported from the first A/D converter and the electric current exported from the 2nd A/D converter
The transformation data of instantaneous value, are entered the first FPGA arithmetic unit and the 2nd FPGA arithmetic unit.Two zero-crossing detector output signals
It is input to switch.Switch two zero-crossing detectors are selected by the setting of CPU come export wherein some, be input to
2nd FPGA arithmetic unit.Such as the test cable for causing current waveform or voltage waveform to be deformed according to defect, selection are corresponding
Zero-crossing detector output.
Fixed sample clock generator generates the fixed sample clock of any setting.Fixed sample clock is input to two A/
D converter, two A/D converters carry out A/D transformation according to the input.
First FPGA arithmetic unit is according to the instantaneous voltage v (n) for being transformed to digital value by the first A/D converter, and leads to
The current instantaneous value a (n) that the 2nd A/D converter is transformed to digital value is crossed, voltage effective value, current effective value, effectively electricity are calculated
Power.
2nd FPGA arithmetic unit carries out FFT operation, calculating simulation input signal according to the detection signal of zero-crossing detector
Basic wave component and higher harmonic component, based on FFT operation be conducive to realize accurately find out measurement result.
The calculated voltage effective value V of first FPGA arithmetic unit in higher hamonic wave measuring device, current effective value A, effectively
The basic wave component and higher harmonic component of the active power of electric power P and the 2nd calculated voltage and current of FPGA arithmetic unit,
It is shown over the display via CPU.By the operation input from operation panel, control is switched over to switch.
The harmonic component data of higher hamonic wave measuring device detection inputs host computer, and host computer includes processor and storage
Device is stored with program in memory, execution when program is run by processor: determining that test cable is fallen vacant sunken type, and the survey is received
The harmonic component data that examination cable detects, and it is humorous to generate higher hamonic wave characteristic value high order corresponding with test cable defect type
Wave database.The processor of the host computer can realize on the same device with the cpu function, can also be in distinct device
Upper realization, details are not described herein again.
In above-described embodiment, Fourier transformation calculation formula that the present invention provides are as follows:
Wherein
For angular frequency, f is frequency, and T is the sampling period；N is positive integer, n >=1.
Then
a0For signalDC component, enable
c1For fundamental voltage amplitude, cnFor the amplitude of nth harmonic.The rated frequency of China's electric system is 50Hz, then fundamental wave is
50Hz, harmonic frequency be fundamental frequency integral multiple, according to multiple become n times harmonic wave, as 3 times of fundamental frequency become 3 times it is humorous
Wave.The each harmonic for including is obtained according to above-mentioned expression formula principle.
Nth harmonic voltage contributions rate is with HRUn(HarmonicRatioUn) indicate:
UnFor n-th harmonic voltage effective value, U1For fundamental voltage RMS.
Nth harmonic current contribution rate is with HRInIt indicates:
InFor n-th harmonic current effective value, I1For fundamental current virtual value.
Harmonic voltage content UHWith harmonic current content IHIt is respectively defined as:
Above-mentioned each higher hamonic wave characteristic value under various electric cable stoppage states is calculated according to above-mentioned expression formula.
Specific case used herein elaborates inventive concept, the explanation of above example is only intended to
Help understands core of the invention thought.It should be pointed out that for those skilled in the art, not departing from this
Under the premise of inventive concept, any obvious modification, equivalent replacement or the other improvements made should be included in the present invention
Protection scope within.
Claims (10)
1. a kind of cable lacks the test of line higher hamonic wave and detection system, it is characterised in that: include:
Cable and connector defective physical model: it is used for dummycable defect type；
Higher hamonic wave measuring device；Acquire the higher hamonic wave characteristic value generated under each dummycable defect type, and according to
The higher hamonic wave characteristic value generates higher hamonic wave database with corresponding dummycable defect type.
2. cable according to claim 1 lacks the test of line higher hamonic wave and detection system, it is characterised in that: cable and connector
Defective physical model includes test cable and detection circuit；Detection circuit includes automatic coupling voltage regulator T1, step-up transformer T2, protection
Resistance R and standard capacitance C and capacitance bridge CB；Automatic coupling voltage regulator T1 is connect with step-up transformer provides AC power source, power supply
Connect protective resistance R at both ends；It is accessed between protective resistance R and capacitance bridge CB after standard capacitance C and test cable are in parallel；Capacitor
The output end of electric bridge CB connects higher hamonic wave measuring device.
3. cable according to claim 2 lacks the test of line higher hamonic wave and detection system, it is characterised in that: higher hamonic wave is surveyed
Measuring device includes dsp chip, current sensor, signal conditioning circuit, A/D sample circuit；The detection circuit output end connection
Current sensor, current sensor connect dsp chip with A/D sample circuit through signal conditioning circuit；Current sensor and DSP core
Excess detector circuit and phase-locking frequency multiplication circuit are set between piece.
4. cable according to claim 3 lacks the test of line higher hamonic wave and detection system, it is characterised in that: the zero passage inspection
Slowdown monitoring circuit includes: the output end setting sampling resistor of current sensor, and the pressure drop of sampling resistor introduces hysteresis loop comparator, hysteresis ratio
Output end compared with device is connected to NAND gate Schmidt trigger through clamp circuit.
5. cable according to claim 4 lacks the test of line higher hamonic wave and detection system, it is characterised in that: the locking phase times
Frequency circuit includes phase-locked loop chip, summary counter and low-pass filter；The phase-locked loop chip is that a signal input part connects
The output end of NOT gate Schmidt trigger；Phase-locked loop chip is the input terminal that a signal output end connects summary counter；It is cumulative
The comparison signal input terminal of the frequency-doubled signal output end connection phase-locked loop chip of counter；The comparison signal of phase-locked loop chip exports
End connects the control signal input of phase-locked loop chip by the low-pass filter.
6. lacking the test of line higher hamonic wave and detection system according to the described in any item cables of claim 3-5, it is characterised in that: institute
Stating higher hamonic wave measuring device further includes host computer, and the harmonic component data of the output dsp chip output inputs host computer, on
Position machine includes processor and memory, program is stored in memory, execution when program is run by processor: determining test cable
Defect type out receives the harmonic component data that the test cable detects, and generates higher hamonic wave characteristic value and test cable
The corresponding higher hamonic wave database of defect type.
7. cable according to claim 1 lacks the test of line higher hamonic wave and detection system, it is characterised in that: including test electricity
Road and detection circuit；Detection circuit includes automatic coupling voltage regulator T1, step-up transformer T2, protective resistance R, derided capacitors C1 and partial pressure
Capacitor C2, coupling capacitor Ck detect impedance Z m, and automatic coupling voltage regulator T1 is connect with step-up transformer provides AC power source, power supply
Connect protective resistance R at both ends；After derided capacitors C1 and derided capacitors C2 series connection and it is connected between protective resistance R and power end,
After coupling capacitor Ck and detection impedance Z m connects and it is connected between protective resistance R and power end；Protective resistance R with couple electricity
Connecting node between container Ck connects higher hamonic wave measuring device for accessing test cable, the detection both ends impedance Z m.
8. cable according to claim 7 lacks the test of line higher hamonic wave and detection system, it is characterised in that: further include test
Cable support, test cable bracket include the lasso that fixed link is connected with fixed link top, and at least two test cable brackets are in
One fixed spacing is fixed on bottom plate.
9. cable according to claim 7 lacks the test of line higher hamonic wave and detection system, it is characterised in that: the high order is humorous
Wave measuring apparatus includes voltage input circuit, the first A/D converter, the first zero-crossing detector, current input circuit, the 2nd A/
D converter, the second zero-crossing detector, switch, the first FPGA arithmetic unit, the 2nd FPGA arithmetic unit, CPU, display, fixation
Sampling clock generator, operation panel；
Voltage input circuit connects the first A/D converter and the first zero crossing (zero cross) detector；Current input circuit
The 2nd A/D converter and the second zero-crossing detector are connected, two converters are connected to the first FPGA arithmetic unit, the 2nd FPGA fortune
Calculate device and fixed sample clock generator；Two zero-crossing detectors are connected to switch；Switch is connected to the 2nd FPGA
Arithmetic unit；And switch, the first FPGA arithmetic unit, the 2nd FPGA arithmetic unit, display, fixed sample clock generator, operation
Panel is connected to CPU.
10. cable according to claim 9 lacks the test of line higher hamonic wave and detection system, it is characterised in that: higher hamonic wave
Measuring device includes host computer, and the harmonic component data of higher hamonic wave measuring device detection inputs host computer, and host computer includes place
Device and memory are managed, is stored with program in memory, execution when program is run by processor: determining that test cable is fallen vacant sunken class
Type receives the harmonic component data that the test cable detects, and generates higher hamonic wave characteristic value and test cable defect type
Corresponding higher hamonic wave database.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811298430.0A CN109116191A (en) | 2018-11-02 | 2018-11-02 | A kind of test of electric cable stoppage higher hamonic wave and detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044860A (en) * | 2019-12-19 | 2020-04-21 | 国网北京市电力公司 | Method and device for analyzing insulation defect of cable body, storage medium and processor |
| CN112834950A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539913A (en) * | 2010-11-24 | 2012-07-04 | 横河电机株式会社 | Higher harmonic component testing apparatus |
| CN103926512A (en) * | 2014-03-25 | 2014-07-16 | 国家电网公司 | Method for simulating XLPE insulated cable partial discharge and simulation testing platform |
| CN104330694A (en) * | 2014-06-30 | 2015-02-04 | 国家电网公司 | Method for analyzing and diagnosing real-time state of line online by utilizing harmonic amount |
| CN106771895A (en) * | 2016-11-25 | 2017-05-31 | 国网上海市电力公司 | A kind of cable degradation detecting method based on magnetic field harmonics detection |
| CN107037338A (en) * | 2017-04-26 | 2017-08-11 | 国网上海市电力公司 | A kind of GIS oscillatory surges pressure test default kind identification method |
| CN108614199A (en) * | 2018-04-26 | 2018-10-02 | 广州供电局有限公司 | Power cable defect model test platform |
-
2018
- 2018-11-02 CN CN201811298430.0A patent/CN109116191A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539913A (en) * | 2010-11-24 | 2012-07-04 | 横河电机株式会社 | Higher harmonic component testing apparatus |
| CN103926512A (en) * | 2014-03-25 | 2014-07-16 | 国家电网公司 | Method for simulating XLPE insulated cable partial discharge and simulation testing platform |
| CN104330694A (en) * | 2014-06-30 | 2015-02-04 | 国家电网公司 | Method for analyzing and diagnosing real-time state of line online by utilizing harmonic amount |
| CN106771895A (en) * | 2016-11-25 | 2017-05-31 | 国网上海市电力公司 | A kind of cable degradation detecting method based on magnetic field harmonics detection |
| CN107037338A (en) * | 2017-04-26 | 2017-08-11 | 国网上海市电力公司 | A kind of GIS oscillatory surges pressure test default kind identification method |
| CN108614199A (en) * | 2018-04-26 | 2018-10-02 | 广州供电局有限公司 | Power cable defect model test platform |
Non-Patent Citations (3)
| Title |
|---|
| 张海 等: "电力电缆局部放电全过程检测系统", 《山西电力》 * |
| 王备贝: "电力电缆绝缘缺陷检测方法的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 魏钢: "高压交联聚乙烯电力电缆接头绝缘缺陷检测及识别研究", 《中国博士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044860A (en) * | 2019-12-19 | 2020-04-21 | 国网北京市电力公司 | Method and device for analyzing insulation defect of cable body, storage medium and processor |
| CN112834950A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
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