CN108802583A - A kind of electric railway high pressure feeder cable partial discharge monitoring method - Google Patents
A kind of electric railway high pressure feeder cable partial discharge monitoring method Download PDFInfo
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- CN108802583A CN108802583A CN201810669070.4A CN201810669070A CN108802583A CN 108802583 A CN108802583 A CN 108802583A CN 201810669070 A CN201810669070 A CN 201810669070A CN 108802583 A CN108802583 A CN 108802583A
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- cable
- high pressure
- signal
- pressure feeder
- feeder cable
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
Electric railway high pressure feeder cable partial discharge monitoring method disclosed by the invention, including：HF current transformer is set on the cable grounding line of more high pressure feeder cables；HF current transformer synchronous acquisition cable local discharge signal is simultaneously sent to collecting unit processing by the coaxial line of equal length；By treated, multiple cable local discharge signals are sent to monitoring host to collecting unit, and monitoring host passes through the high pressure feeder cable that shelf depreciation occurs for analytical judgment.The present invention is solved because more feeder cable same-phases are laid side by side, the problem of problem and existing fiber thermometric response lag for causing cable local discharge test inaccurate, without complicated live manual operation, high-speed multiple channel synchronous high-speed acquisition local discharge signal need to only be relied on and analyze its signal amplitude and delay situation occurs, the partial discharge quantity with mutually every cable can quickly be tested out, the insulation status for assessing cable, prevents the generation of breakdown accident.
Description
Technical field
The invention belongs to electrified railroad high voltage wire road Insulation test technical fields, and in particular to a kind of electric railway is high
Press feeder cable partial discharge monitoring method.
Background technology
With the fast development of high ferro, high pressure feeder cable has been widely used in electric railway traction power supply system.
Contact net is often built from the electric energy of the transformer terminal of substation output because bridging some to locomotive power supply in a manner of bare conductor
Electric energy must be conveyed in underground in the form of cable by building object or barrier, so feeder cable comes into being, before high ferro development
The 27.5kV power cables that stage phase is not designed exclusively for railway applications, often with common 35kV twisted polyethylene cables generation
For and largely use.Traction power supply feeder cable load current with by number of locomotives, power etc. it is related, load current is short
The impact load of time, and due to the special connection of tractive transformer and the imbalance of power supply cause supply line's harmonic wave compared with
Greatly, so that the service life of electric railway cable is assessed can not be directly with reference to electric system cable service life.Additionally, due to feedback
The bad environments that line cable uses, to cause the deterioration of cable major insulation serious, inside easy to produce shelf depreciation, to plus
Speed major insulation punctures speed.
Tractive power supply system has only carried out optical fiber temperature-measurement on-line monitoring, but traction power supply cable at cable external insulation at present
Impact load in short-term very little is influenced on cable body temperature, and the majority measured at external insulation is environment temperature.Even if electric
Cable or cable accessory, which break down, causes temperature at external insulation to increase, but since the reaction time is too slow, staff is being connected to light
Cable may have occurred that explosion when fine temp measuring system alarm, cannot play the role of giving warning in advance.So to electrified iron
The partial discharge monitoring of road high pressure feeder cable especially substitutes 27.5kV feeder cables to early stage with 35kV power cables
Partial discharge monitoring prevents the generation of dielectric breakdown accident, is very important.
Retrieval discovery, patent, text of the prior art for research power cable local discharge on-line monitoring device and method
Offer it is more, and it is less for the local discharge on-line monitoring device and method of electrified railroad traction system high pressure feeder cable,
Pertinent literature is also few, entitled《A kind of traction substation feeder cable partial discharge monitoring device and its monitoring method》
(applying date is on November 20th, 2013, application No. is 201310591045.6, data of publication of application is on 03 05th, 2014, is public
The number of opening be CN103616620A) patent in, the feeder cable partial discharge monitoring method being described, be utilize sound sensor
Device and temperature sensor extract signal, only when cable built-in electrical insulation development of defects to it is more serious when, or even close to breakdown
Edge when, just have apparent sound and vibration signal outflow.And since cable is mostly outdoor laying, noise is larger, passes through
Sound and shock sensor test local discharge signal error are very big.
Invention content
The present invention provides a kind of electric railway high pressure feeder cable partial discharge monitoring methods, according to feeder line electricity
The TTT and FFF or TTTT of cable and FFFF wiring features are fed back by the way of multiple HFCT synchronous signal acquisitions by analyzing
The amplitude of signal and whether postpone, and then the accurate high pressure feeder cable for judging that shelf depreciation occurs.
The technical solution adopted in the present invention is：A kind of electric railway high pressure feeder cable partial discharge monitoring side
Method, including step：
Step 1: HF current transformer, the height are respectively set on the cable grounding line of more high pressure feeder cables
Frequency current transformer is used for the local discharge signal of coupling cable；
Step 2: multiple HF current transformer synchronous acquisition cable local discharge signals, and by collected electricity
Cable local discharge signal is sent to collecting unit by the coaxial line of equal length, and the collecting unit is to multiple signals for receiving
It is filtered, amplifies, data acquisition and storage are handled；
Step 3: the collecting unit is by treated, multiple cable local discharge signals are sent to monitoring host, described
The hardware controls that host is used for the collecting unit are monitored, and are believed by multiple cable local discharges after analyzing processing
Number, judge the high pressure feeder cable that shelf depreciation occurs, while showing shelf depreciation time-frequency domain signal and electric discharge collection of illustrative plates.
Specifically, in the step 3, monitors host analysis signal amplitude and whether signal postpones to judge to occur local put
The high pressure feeder cable of electricity postpones when a certain signal amplitude is more than other signal amplitudes and other signals with respect to the signal
When, then judge that shelf depreciation occurs for the corresponding high pressure feeder cable of the signal.
Example, the sample frequency of the HF current transformer is 100Mbps.
Example, the connection type of the high pressure feeder cable is using TTT and FFF or TTTT and FFFF connections.
The beneficial effects of the invention are as follows：A kind of electric railway high pressure feeder cable partial discharge monitoring side of the present invention
Method solves the problem for causing cable local discharge test inaccurate because more feeder cable same-phases are laid side by side and existing
The problem of optical fiber temperature-measurement response lag, and without complicated live manual operation, high-speed multiple channel synchronous high-speed only need to be relied on
Acquisition local discharge signal simultaneously analyzes its signal amplitude and delay situation occurs, so that it may quickly to test out same mutually every cable
Partial discharge quantity assesses the insulation status of every cable, prevents the generation of breakdown accident.
Description of the drawings
Fig. 1 is high pressure feeder cable connection type used in the embodiment of the present invention；
Fig. 2 is the equivalent circuit diagram of Fig. 1；
Fig. 3 is the timing chart of L1, L2, L3, L4 sensor passage synchronous acquisition of the embodiment of the present invention；
Fig. 4 is the channels L3 high pressure feedline circuit partial discharge pulse statistics scatter plot；
Fig. 5 is the channels L3 high pressure feedline circuit partial discharge pulse statistics discharge spectrum.
In figure, 1. feeder line bare conductors, 2. feeder cable connectors, 3. high pressure feeder cables, 4. HF current transformers, 5. electricity
Cable is grounded, 6. grounding boxes, 7. coaxial lines, 8. collecting units, 9. cable lines, 10. communication units, 11. cables, 12. monitoring masters
Machine, 13. transition joints.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The present invention provides a kind of electric railway high pressure feeder cable partial discharge monitoring method, is directed to
The high pressure feeder cable connection type of TTT and FFF or TTTT and FFFF connections, the connection type is as shown in Figure 1, railway in figure
Locomotive power supply feeder line bare conductor 1, one end connect railway contact line, and the other end is connected with feeder cable connector 2, feeder cable connector
2 are connected with feeder cable 3, and are connected to traction by several transition joints 13 and become, and have cable grounding at every cable connector 2
Line 5 is grounded by grounding box 6, forms the connection type that traction fades to feeder line section primary equipment.
The present embodiment is illustrated by taking 4 high pressure feeder cables 3 as an example, and the present embodiment uses four HF current transformers
4 (HFCT) cramp joints extract cable local discharge signal, and be connected to by high frequency coaxial line 7 on every cable grounding line 5
On collecting unit 8, and it is isometric to require all coaxial lines 7, is connected on communication unit 10 by cable line 9, communication unit
10 are connected with monitoring host 12 by cable 11.
The equivalent circuit diagram of Fig. 1 as shown in Fig. 2, four cable connectors are named as T1, T2, T3, T4, then T1, T2,
T3, T4 are equivalent at capacitance C1, C2, C3, C4, and HFCT is equivalent at inductance L1, L2, L3, L4, for high-frequency impulse on inductive grounding line
Current signal.
The method that now the present invention will be described in detail for shelf depreciation occurs at C3 cable connectors in Fig. 2.C3 connectors occur
Electric discharge generates high-frequency pulse signal at electric discharge, and signal is transmitted along cable core and shielded layer, and L3 sensors are coupled to ground wire
On discharge signal, along core transmission signal then along cable outlet feeder line transmit, since four cable runs connect simultaneously
It is connected on feeder line, so theoretical according to high-frequency signal long-line transmission, signal is then according to the difference of equivalent load, along each electricity
Cable line transmission, by equivalent capacity action transport to ground wire, so the HFCT of L1, L2, L4 can also be coupled to discharge signal,
Again because capacitance effect and Line Attenuation, signal amplitude are less than the discharge signal at L3, signal at L3 is in addition compared in time
There is obvious postpone.
According to tetra- road discharge signal feature of L1, L2, L3, L4, monitoring host 12 judge signal amplitude more than other signals and
Shelf depreciation occurs for the corresponding high pressure feeder cables 3 of L3 that signal does not postpone.The reception synchronizing signal of collecting unit 8 is simultaneously right
It is filtered, amplifies, signal acquisition and storage are handled so that the judgement structure of monitoring host 12 is more accurate.In conjunction with this
System four-way synchronous high-speed acquires, sample rate 100Mbps, and single maximum sampling length is 20ms, is satisfied with on-the-spot test
It is required that.Four road pulse signal of synchronous acquisition time domain, by amplitude and delay character, comprehensive judgement is which cable connector has occurred
Shelf depreciation.
The present embodiment also passes through the process of laboratory proofing this method：
The laboratory proofing of the present invention builds the feeder cable mode of connection that can be pressurizeed in laboratory according to Fig. 1,
Shelf depreciation defect is artificially made before experiment at T3, makes to generate local discharge signal in pressure process.
First, by monitoring system, the mode of connection confirms the connection completion of monitoring system various pieces each according to Fig. 1
Whether kind connecting line is reasonable, especially from the coaxial line 7 on HF current transformer 4 (HFCT) to collecting unit 8, to wait as possible
Length, four axial length differences finally open monitoring host and are in continuous acquisition pattern no more than 10cm.
Secondly, it supports to continue in feeder line and add high pressure, system is monitored in pressure process and is in continuous monitoring state, until at L3
There is apparent discharge signal, after stablizing one end time, then continuous voltage rise, until thering is apparent discharge pulse to occur to four HFCT.
Finally, burning voltage, the acquisition of continuous systems data, and the impulse waveform in each channel is observed and recorded, analysis four
The discharge pulse amplitude and delay characteristics situation in a channel, and system-computed is carried out, ultimately form electric discharge statistics spectrogram.
In the laboratory proofing experiment of the present invention, the corresponding oscillogram in the channel L1, L2, L3, L4 of system synchronization acquisition, such as
Shown in Fig. 3, it can be seen that：L3 signal amplitudes are more than 10 times of other three tunnels or more first；Secondly the waveform starting point of L3 will be ahead of
Other three roads 10ns；It is more apparent than L3 finally the concussion of the channel L1, L2, L4 waveform to be can be seen that from wave characteristics, illustrates high-frequency impulse
Wave generated when by line transmission the distortion of waveform as a result, this also complies with the characteristic of high-frequency impulse wave transmission attenuation, so
It is apparent to find out that this time electric discharge is that there are discharge sources by L3, and other three tunnels are then to be coupled to Discharge pulse waveform simultaneously, L1,
The channel L2, L4 is regarded as interference signal, can be filtered out using this algorithm, in order to avoid cause the erroneous judgement on this three tunnel.And so on,
He discharges in channel, can also be analyzed with the method, can accurately judge which cable connector is discharged.
L3 path partially discharge signals are bright in feeder cable partial discharge monitoring system it can be seen from Fig. 4 and Fig. 5
It is aobvious, wherein by scatter plot phase distribution is bright it can be seen from the channels L3 feeder cable partial discharge pulse statistics scatter plot in Fig. 4
It is aobvious, it is mainly distributed on positive axis and negative semiaxis concentrates electric discharge, this meets cable local discharge essential characteristic；Fig. 5 is statistics spectrogram
It is the superposition of multiple power frequency period discharge pulses, specifically, Fig. 5 a are graphics, Fig. 5 b scheme for N-Q, and Fig. 5 c are phase diagram, figure
5d is electric discharge spirogram, it can thus be seen that in the positive and negative semiaxis for concentrating on power frequency period, point of discharge region is concentrated, and is met
Discharge characteristic, system are determined as inside cable that there are Partial Discharge Sources.And the processing of inventive algorithm is passed through on other three tunnels, finally
Result discharge off after tested.
It therefore, can be online to electric railway 27.5kV feeder cable shelf depreciations using present invention monitoring and method of discrimination
Monitoring, and can accurately judge to occur in cable arranged side by side the cable of shelf depreciation, there is higher precision and accuracy.
Claims (4)
1. a kind of electric railway high pressure feeder cable partial discharge monitoring method, which is characterized in that including step：
Step 1: HF current transformer, the high-frequency electrical are respectively set on the cable grounding line of more high pressure feeder cables
Current transformer is used for coupling cable local discharge signal；
Step 2: multiple HF current transformer synchronous acquisition cable local discharge signals, and by collected cable office
Portion's discharge signal is sent to collecting unit by the coaxial line of equal length, and the collecting unit carries out the multiple signals received
Filtering, amplification, acquisition and storage processing；
Step 3: the collecting unit is by treated, multiple cable local discharge signals are sent to monitoring host, the monitoring
Host is used for the hardware controls of the collecting unit, and by multiple cable local discharge signals after analyzing processing, sentences
It is disconnected that the high pressure feeder cable of shelf depreciation occurs, while showing shelf depreciation time-frequency domain signal and electric discharge collection of illustrative plates.
2. a kind of electric railway high pressure feeder cable partial discharge monitoring method as described in claim 1, feature
It is, in the step 3, monitors host analysis signal amplitude and whether signal postpones the high pressure for judging that shelf depreciation occurs feedback
Line cable, when a certain signal amplitude is more than other signal amplitudes and other signals postpone with respect to the signal, then judging should
Shelf depreciation occurs for the corresponding high pressure feeder cable of signal.
3. a kind of electric railway high pressure feeder cable partial discharge monitoring method as described in claim 1, feature
It is, the sample frequency of the HF current transformer is 100Mbps.
4. a kind of electric railway high pressure feeder cable partial discharge monitoring method as described in claim 1, feature
It is, the connection type of the high pressure feeder cable is using TTT and FFF or TTTT and FFFF connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810669070.4A CN108802583A (en) | 2018-06-26 | 2018-06-26 | A kind of electric railway high pressure feeder cable partial discharge monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810669070.4A CN108802583A (en) | 2018-06-26 | 2018-06-26 | A kind of electric railway high pressure feeder cable partial discharge monitoring method |
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| CN108802583A true CN108802583A (en) | 2018-11-13 |
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| CN201810669070.4A Pending CN108802583A (en) | 2018-06-26 | 2018-06-26 | A kind of electric railway high pressure feeder cable partial discharge monitoring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781475A (en) * | 2020-07-24 | 2020-10-16 | 广东电网有限责任公司电力科学研究院 | Partial discharge pulse sequence simulation device based on Marx generator |
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