CN108318785A - A kind of humorous pressure-resistant apparatus of cable string having defect location function - Google Patents
A kind of humorous pressure-resistant apparatus of cable string having defect location function Download PDFInfo
- Publication number
- CN108318785A CN108318785A CN201710063972.9A CN201710063972A CN108318785A CN 108318785 A CN108318785 A CN 108318785A CN 201710063972 A CN201710063972 A CN 201710063972A CN 108318785 A CN108318785 A CN 108318785A
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- cable
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- discharge
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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
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
-
- 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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention relates to a kind of humorous pressure-resistant apparatus of cable string having defect location function, including several steps, 1, equipment wiring；2, test cable insulation resistance；3, calibrating cable；4, pressure test；5, oscillation wave is tested；6, systematic survey partial discharge amount；7, software analyzes partial discharge data；The present apparatus uses ac high-voltage source, on AC frequency conversion series resonance pressure-resistant apparatus, additional peak synchronizing signal makes series resonant tank stop power output in peak value, and is closed at high-pressure electronic switch, oscillation wave damped oscillation is formed, cable local discharge test is carried out.A set of equipment can complete exchange Resonance Voltage Withstand Test and oscillation wave local discharge test, realize dual-use, greatly improve work on the spot efficiency, be accurately positioned partial discharge source.
Description
Technical field
The present invention relates to the humorous technical fields of cable string, and in particular to a kind of humorous pressure resistance of cable string having defect location function
Device.
Background technology
As power supply reliability requires to be continuously improved, grid operator faces huge challenge, and power cable has safety can
Lean on, climate influence it is small, hidden durable the advantages that, widely used in urban distribution network.The increase of run time and
The case where ever-increasing load, cable breaks down, becomes frequent, and the diagnostic work of state of insulation becomes particularly important.At present
Management to power cable maintenance, mainly foundation《Power equipment hand-over and preventive test regulation》The project of defined and examination
It tests the period, dielectric test is periodically carried out under power failure.Wherein variable-frequency series-resonance is tested since Test condition is close
The operating condition of cable, therefore as domestic most widely used test method at present.
But a large number of experiments and experience have shown that, series resonance pressure test can not quantify the state of cable integral insulation
Assessment, some still have the phenomenon that discharge breakdown in a short time by the high-tension cable of series resonance pressure test.By long-term right
The development test and practice of high-tension cable, it is believed that shelf depreciation is the tendency of cable insulation failure, and effectively detecting shelf depreciation is
Improve a kind of important channel of cable status required level of service.
It is one kind of power cable " repair based on condition of component " that oscillation wave cable partial discharge, which is diagnosed with positioning system (abbreviation OWTS systems),
New method.But the method be first to XLPE cable apply DC voltage, using the partial discharge under the conditions of the damp oscillatory wave of formation into
Row diagnosis and positioning；And the DC break down voltage experiment of XLPE cable easily causes charge buildup, charge buildup is to have recessiveness to cable
It injures and is also easy to generate false Partial discharge signal.The direct current oscillation wave boosting retention time is short, storage energy is small, is unable to fully excite
Shelf depreciation.The use of the method is worthy of further study.Therefore we develop ac-decay damp oscillatory wave partial discharge
Test device, the present apparatus use ac high-voltage source, and on AC frequency conversion series resonance pressure-resistant apparatus, additional peak synchronizing signal makes
Series resonant tank stops power output in peak value, and is closed at high-pressure electronic switch, forms oscillation wave damped oscillation, into
Row cable local discharge is tested.It can reliably find the faint insulation defect of cable and cable connector, and can accurately determine
Position.
Invention content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of humorous resistance to press fittings of the cable string having defect location function
It sets so that a set of equipment can complete exchange Resonance Voltage Withstand Test and oscillation wave local discharge test, realize dual-use, greatly improve
Work on the spot efficiency is accurately positioned partial discharge source..
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of humorous pressure-resistant apparatus of cable string having defect location function, which is characterized in that specific method and step is as follows：
Step 1：Equipment wiring
Connect equipment components；
Step 2：Test cable insulation resistance
Using the insulation resistance of 2.5kV insulation resistance instrument test cables, tested phase both ends cable core is unlocked vacantly, test lead
Connecting test instrument.Another two-phase both ends cable core unlocks ground connection.Insulation resistance requires to be more than 1000M Ω；
Step 3：Calibrating cable
Using the length of partial discharge calibrator calibrating cable, calibration information is preserved in test software；
Step 4：Pressure test
Variable-frequency power sources automatic adjustment frequency keeps test voltage on cable at a resonant condition to system resonance point, into
Row ac voltage withstanding is tested；
Step 5：Oscillation wave is tested
After completing pressure test, high-voltage switch gear is closed automatically, makes resonance reactor and be tested cable and formed gradually to decay
Damp oscillatory wave excites the insulation defect in cable.The time difference of incidence wave and back wave, orientation discharge are calculated by software systems
The position in source；
Preferably, software systems carry out shelf depreciation positioning using pulse reflection method, when cable local discharge, in point of discharge
Place sends out the propagation of pulse wave direction both ends, if point of discharge is close to cable proximal end, wherein and it is high-voltage capacitance, to detect impedance, while
Matching impedance is done, reflection of the pulse in high-pressure side is eliminated.The impulse wave for being transmitted to proximal end reaches proximal end back reflection, and on position indicator
It shows, referred to as incoming wave, the impulse wave for being transmitted to distal end reaches distal end back reflection arrival proximal end and shown on position indicator
Come, referred to as back wave.
Preferably, it is assumed that the length of the cable of test is l, and the size for adding the partial discharge quantity of cable is Q, which puts
The distance at electricity point distance test end is x, and pulse can be propagated after generating to two opposite directions, then shelf depreciation positioning meter
Calculating formula is：
In formula, v is velocity of wave propagation, t1Pulse on partial discharge position is generated for cable directly to reach used in test lead
Time, t2The time that test lead is propagated backward to after pulse arrival test is end-to-end on the position of shelf depreciation is generated for cable.
Preferably, further include step 6：Systematic survey partial discharge amount
Assuming that shelf depreciation, u occurs apart from cable x proximal pointspdFor discharge voltage wave voltage, upd' electricity surveyed by measurement point
Pressure, then the algorithm of partial discharge discharge of electricity amount q is：
When single cable is there are when multiple spot electric discharge, pulse voltage wave is propagated in the cable, changed in each impedance
Place, which generates, to be reflected and returns.Can wave recording and reflection interval, and calculate each fault distance automatically.
Preferably, further include step 7：Software analyzes partial discharge data
The local discharge signal that the insulation weak link of the tested cable of special-purpose software acquisition and its connector is occurred.Using more
The partial discharge data of secondary test establish analysis library.Software has PRPD collection of illustrative plates statistical functions, can assist to judge shelf depreciation type.It is soft
Pulse is grouped using statistics recognizer, is rejected random disturbing pulse, and enable discharge pulse using superposition algorithm by part automatically
It is more smooth with back wave.High-volume principle calculates discharge source to the positioning principle and survey bureau of software foundation step 5 and step 6 automatically
Position, position error be not more than cable length 1%.
(3) advantageous effect
The present apparatus uses ac high-voltage source, and on AC frequency conversion series resonance pressure-resistant apparatus, additional peak synchronizing signal makes
Series resonant tank stops power output in peak value, and is closed at high-pressure electronic switch, forms oscillation wave damped oscillation, into
Row cable local discharge is tested.A set of equipment can complete exchange Resonance Voltage Withstand Test and oscillation wave local discharge test, realize a machine two
With greatly improving work on the spot efficiency, be accurately positioned partial discharge source.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the test flow chart of the present invention；
Fig. 2 is the cable calibration figure of the present invention；
Fig. 3 is the positioning system schematic diagram of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
The present invention will be further described below with reference to the drawings.
A kind of humorous pressure-resistant apparatus of cable string having defect location function, including variable-frequency power sources host and variable-frequency power sources master
Machine connection exciting transformer, connect with exciting transformer resonance reactor, connect with resonance reactor divider, and divide
The laptop of depressor connection.
Additional peak synchronizing signal and high-voltage switch gear inside apparatus of the present invention, the variable-frequency power sources and exciting transformer.
By frequency converter Lai synchronization optical fiber signal be input in high voltage switching module, the output end of high voltage switching module and exciting transformer
It is in parallel.By additional peak synchronizing signal and high-voltage switch gear, series resonant tank is set to stop power output in peak value, and simultaneously
Closed high switchs, and forms oscillation wave damped oscillation, carries out cable local discharge test.
Apparatus of the present invention, the divider are internally provided with partial discharge collector, sample frequency 100MHz, analog bandwidth
For 50MHz, divider has the function of USB and WIFI data connections, for collected partial discharge information to be transferred to analysis software
In.
Apparatus of the present invention, the partial discharge calibrator are used for the length of calibrating cable.
Steps are as follows for the specific method that apparatus of the present invention are implemented：
Step 1：Equipment wiring
Connect equipment components.
Step 2：Test cable insulation resistance
Using the insulation resistance of 2.5kV insulation resistance instrument test cables, tested phase both ends cable core is unlocked vacantly, test lead
Connecting test instrument.Another two-phase both ends cable core unlocks ground connection.Insulation resistance requires to be more than 1000M Ω.
Step 3：Calibrating cable
Using the length of partial discharge calibrator calibrating cable, calibration information is preserved in test software.Alignment pattern such as Fig. 2 institutes
Show.
Step 4：Pressure test
Variable-frequency power sources automatic adjustment frequency keeps test voltage on cable at a resonant condition to system resonance point, into
Row ac voltage withstanding is tested.
Step 5：Oscillation wave partial discharge location
After completing pressure test, high-voltage switch gear is closed automatically, makes resonance reactor and be tested cable and formed gradually to decay
Damp oscillatory wave excites the insulation defect in cable.System carries out shelf depreciation positioning, principle using pulse reflection method (TDR)
As shown in Figure 3.When cable local discharge, the propagation of pulse wave direction both ends is sent out at point of discharge, if point of discharge close to cable proximal end,
Wherein, C is high-voltage capacitance, and Z is detection impedance, while also doing matching impedance, eliminates reflection of the pulse in high-pressure side.It is transmitted to proximal end
Impulse wave reach proximal end back reflection, and shown on position indicator, referred to as incoming wave, be transmitted to distal end impulse wave reach it is remote
End back reflection reaches proximal end and is shown on position indicator, referred to as back wave.
Assuming that test cable length be l, add the partial discharge quantity of cable size be Q, the shelf depreciation point away from
It is x with a distance from test lead, can be propagated to two opposite directions after pulse generation, then shelf depreciation location Calculation formula
For：
In formula, v is velocity of wave propagation, t1Pulse on partial discharge position is generated for cable directly to reach used in test lead
Time, t2The time that test lead is propagated backward to after pulse arrival test is end-to-end on the position of shelf depreciation is generated for cable.
Step 6：Systematic survey partial discharge amount
Assuming that shelf depreciation, u occurs apart from cable x proximal pointspdFor discharge voltage wave voltage, upd' electricity surveyed by measurement point
Pressure, then the algorithm of partial discharge discharge of electricity amount q is：
When single cable is there are when multiple spot electric discharge, pulse voltage wave is propagated in the cable, changed in each impedance
Place, which generates, to be reflected and returns.Can wave recording and reflection interval, and calculate each fault distance automatically.
Step 7：Software analyzes partial discharge data
The local discharge signal that the insulation weak link of the tested cable of special-purpose software acquisition and its connector is occurred.Using more
The partial discharge data of secondary test establish analysis library.Software has PRPD collection of illustrative plates statistical functions, can assist to judge shelf depreciation type.It is soft
Pulse is grouped using statistics recognizer, is rejected random disturbing pulse, and enable discharge pulse using superposition algorithm by part automatically
It is more smooth with back wave.High-volume principle calculates discharge source to the positioning principle and survey bureau of software foundation step 5 and step 6 automatically
Position, position error be not more than cable length 1%.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (5)
1. a kind of humorous pressure-resistant apparatus of cable string having defect location function, which is characterized in that specific method and step is as follows：
Step 1：Equipment wiring
Connect equipment components；
Step 2：Test cable insulation resistance
Using the insulation resistance of 2.5kV insulation resistance instrument test cables, tested phase both ends cable core is unlocked vacantly, test lead connection
Test equipment.Another two-phase both ends cable core unlocks ground connection.Insulation resistance requires to be more than 1000M Ω；
Step 3：Calibrating cable
Using the length of partial discharge calibrator calibrating cable, calibration information is preserved in test software；
Step 4：Pressure test
Variable-frequency power sources automatic adjustment frequency keeps test voltage on cable at a resonant condition to system resonance point, is handed over
Flow pressure test；
Step 5：Oscillation wave is tested
After completing pressure test, high-voltage switch gear is closed automatically, and resonance reactor and subject cable is made to form the damping gradually to decay
Oscillation wave excites the insulation defect in cable.The time difference of incidence wave and back wave is calculated by software systems, orientation discharge source
Position.
2. the cable string humorous pressure-resistant apparatus according to claim 1 for having defect location function, it is characterised in that：Software system
System carries out shelf depreciation positioning using pulse reflection method, and when cable local discharge, pulse wave direction both ends biography is sent out at point of discharge
It broadcasts, if point of discharge is close to cable proximal end, wherein be high-voltage capacitance, to detect impedance, while also doing matching impedance, eliminate pulse
In the reflection of high-pressure side.The impulse wave for being transmitted to proximal end reaches proximal end back reflection, and is shown on position indicator, referred to as inputs
Wave, the impulse wave for being transmitted to distal end reach distal end back reflection arrival proximal end and are shown on position indicator, referred to as back wave.
3. the cable string humorous pressure-resistant apparatus according to claim 1 for having defect location function, it is characterised in that：Assuming that surveying
The length of the cable of examination is l, and the size for adding the partial discharge quantity of cable is Q, the distance at the shelf depreciation point distance test end
For x, pulse can be propagated after generating to two opposite directions, then shelf depreciation location Calculation formula is：
In formula, v is velocity of wave propagation, t1Pulse on partial discharge position, which is generated, for cable directly reaches the time used in test lead,
t2The time that test lead is propagated backward to after pulse arrival test is end-to-end on the position of shelf depreciation is generated for cable.
4. the cable string humorous pressure-resistant apparatus according to claim 1 for having defect location function, it is characterised in that：Further include
Step 6：Systematic survey partial discharge amount
Assuming that shelf depreciation, u occurs apart from cable x proximal pointspdFor discharge voltage wave voltage, upd' voltage surveyed by measurement point, then
The algorithm of partial discharge discharge of electricity amount q is：
When single cable is there are when multiple spot electric discharge, pulse voltage wave is propagated in the cable, in the changed place of each impedance
It generates and reflects and return.Can wave recording and reflection interval, and calculate each fault distance automatically.
5. the cable string humorous pressure-resistant apparatus according to claim 1 for having defect location function, it is characterised in that：Further include
Step 7：Software analyzes partial discharge data
The local discharge signal that the insulation weak link of the tested cable of special-purpose software acquisition and its connector is occurred.It is surveyed using multiple
The partial discharge data of examination establish analysis library.Software has PRPD collection of illustrative plates statistical functions, can assist to judge shelf depreciation type.Software makes
With statistics recognizer, pulse is grouped automatically, rejects random disturbing pulse, and discharge pulse and anti-is enabled using superposition algorithm
Ejected wave is more smooth.According to the positioning principle of step 5 and step 6 and survey bureau, high-volume principle calculates the position of discharge source to software automatically
It sets, position error is not more than the 1% of cable length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710063972.9A CN108318785A (en) | 2017-01-18 | 2017-01-18 | A kind of humorous pressure-resistant apparatus of cable string having defect location function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710063972.9A CN108318785A (en) | 2017-01-18 | 2017-01-18 | A kind of humorous pressure-resistant apparatus of cable string having defect location function |
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Family
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| CN201710063972.9A Pending CN108318785A (en) | 2017-01-18 | 2017-01-18 | A kind of humorous pressure-resistant apparatus of cable string having defect location function |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613407A (en) * | 2019-01-08 | 2019-04-12 | 国网江苏省电力有限公司电力科学研究院 | Power cable partial discharge location system and detection method |
| CN109655726A (en) * | 2019-01-08 | 2019-04-19 | 国网江苏省电力有限公司电力科学研究院 | Power cable partial discharge location system and detection method based on solenoid high-voltage line |
| CN110196382A (en) * | 2019-07-05 | 2019-09-03 | 杭州西湖电子研究所 | A kind of no check frequency oscillation wave partial discharge detection device |
| CN110261679A (en) * | 2019-05-27 | 2019-09-20 | 国家电网有限公司 | A kind of power cable water inlet detection method, system, storage medium and device |
| CN110261746A (en) * | 2019-07-08 | 2019-09-20 | 清华大学深圳研究生院 | Electric cable stoppage detection method based on oscillating wave voltage periodic attenuation characteristic |
| CN111141998A (en) * | 2019-12-20 | 2020-05-12 | 国网浙江海盐县供电有限公司 | 10kV high-voltage cable alternating-current withstand voltage and partial discharge test system and method |
| CN113608077A (en) * | 2021-06-29 | 2021-11-05 | 深圳供电局有限公司 | Power transmission line test system |
| CN113759223A (en) * | 2021-09-08 | 2021-12-07 | 广东电网有限责任公司 | Oscillation wave partial discharge data conversion method and related device |
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| CN109613407A (en) * | 2019-01-08 | 2019-04-12 | 国网江苏省电力有限公司电力科学研究院 | Power cable partial discharge location system and detection method |
| CN109655726A (en) * | 2019-01-08 | 2019-04-19 | 国网江苏省电力有限公司电力科学研究院 | Power cable partial discharge location system and detection method based on solenoid high-voltage line |
| CN109655726B (en) * | 2019-01-08 | 2024-03-08 | 国网江苏省电力有限公司电力科学研究院 | Power cable partial discharge positioning system and detection method based on solenoid high-voltage line |
| CN109613407B (en) * | 2019-01-08 | 2024-03-08 | 国网江苏省电力有限公司电力科学研究院 | Power cable partial discharge positioning system and detection method |
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| CN110196382B (en) * | 2019-07-05 | 2023-12-22 | 杭州西湖电子研究所 | No detection blind area oscillatory wave partial discharge detection device |
| CN110196382A (en) * | 2019-07-05 | 2019-09-03 | 杭州西湖电子研究所 | A kind of no check frequency oscillation wave partial discharge detection device |
| CN110261746B (en) * | 2019-07-08 | 2021-08-24 | 清华大学深圳研究生院 | Cable defect detection method based on periodic attenuation characteristics of oscillating wave voltage |
| CN110261746A (en) * | 2019-07-08 | 2019-09-20 | 清华大学深圳研究生院 | Electric cable stoppage detection method based on oscillating wave voltage periodic attenuation characteristic |
| CN111141998A (en) * | 2019-12-20 | 2020-05-12 | 国网浙江海盐县供电有限公司 | 10kV high-voltage cable alternating-current withstand voltage and partial discharge test system and method |
| CN113608077A (en) * | 2021-06-29 | 2021-11-05 | 深圳供电局有限公司 | Power transmission line test system |
| CN113759223A (en) * | 2021-09-08 | 2021-12-07 | 广东电网有限责任公司 | Oscillation wave partial discharge data conversion method and related device |
| CN113759223B (en) * | 2021-09-08 | 2023-08-29 | 广东电网有限责任公司 | Oscillating wave partial discharge data conversion method and related device |
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