CN109581171A - High-frequency current method compound field intermediate joint of electric cable partial discharge detecting system - Google Patents
High-frequency current method compound field intermediate joint of electric cable partial discharge detecting system Download PDFInfo
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- CN109581171A CN109581171A CN201811648525.0A CN201811648525A CN109581171A CN 109581171 A CN109581171 A CN 109581171A CN 201811648525 A CN201811648525 A CN 201811648525A CN 109581171 A CN109581171 A CN 109581171A
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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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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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
- G01R31/16—Construction of testing vessels; Electrodes therefor
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention belongs to electric device maintenance technologies, to realize the Partial Discharge Detecting Technology for utilizing HF current transformer, silicon rubber shelf depreciation under compound field is diagnosed and identified, the present invention, high-frequency current method compound field intermediate joint of electric cable partial discharge detecting system, is made of compound field shelf depreciation device, high-frequency current signal acquisition unit, data transmission unit, data processing unit；The compound field shelf depreciation device includes high-voltage DC power supply, the pulse power, voltage recombiner unit and simulation shelf depreciation device；The high-voltage DC power supply connects the input terminal of the voltage recombiner unit with the output end of the pulse power；The simulation shelf depreciation device is made of needle plate type electrode and silicon rubber sample；The collected signal of high-frequency current signal acquisition unit is exported after data transmission unit is transferred to data processing unit processing.Present invention is mainly applied to the design and manufacture occasions of electric equipment detector.
Description
Technical field
The present invention relates to cables, power equipment, and in particular to high-frequency current method compound field intermediate joint of electric cable office
Portion's discharging detecting system.
Background technique
Currently, silicon rubber prefabricated transition joint has been widely applied in transmission line of electricity and power distribution network.It is united according to correlation
Meter data, end the end of the year 2010, China's cable run total length compared with 10 years before total cable length extend about 27%.With cable
The use of elongation transition joint increases therewith, and silicon rubber is widely used in by feat of its good insulation performance and mechanical performance
Prefabricated transition joint.Since prefabricated transition joint is multi-layer solid complex media insulation system, insulation system is compact and needs
Will condition installation forming at the scene, there are many reason of influencing its insulation performance, thus the probability that accident occurs is far longer than electric power
Cable body.To showing in cable operation according to relevant statistics since the failure that transition joint insulation causes accounts for cable therefore
The 31% of barrier
With the compound field collective effect of different combined-voltage ratios in power cable operation.Currently, in electric power
In the traditional research of cable local discharge, there are mainly two types of pressure method, constant-voltage method and methods of gradually boosting.Both pressure methods
It is variant with power cable actual operating mode.Recently as high voltage direct current transmission project (High Voltage Direct
Current, HVDC) development, DC voltage, pulse voltage and harmonic voltage act on lower silicon rubber insulation partial discharge phenomenon analysis
As research hotspot.But at this stage, the test to shelf depreciation under compound field both at home and abroad and the research of diagnostic techniques is still
In the starting stage.
High-frequency current detection method generallys use Rogowski coil high-frequency mutual inductor, and principle is that shelf depreciation occurs for cable
Place can generate the pulse current of high frequency, and the pulse current of high frequency can blaze about on cable core and cable shield, thus
Changing magnetic field can be generated due to non-uniform electric field on cable body or ground line, by sensor card in cable body or
On person's ground line, shelf depreciation letter will be experienced on the integrating resistor when generating changing magnetic field in Rogowski coil
Number.High-frequency current detection method detection frequency range is higher (usually 3-30MHz), has strong antijamming capability, detection sensitivity height etc.
Advantage can be used for detection, fault location and the fault type recognition etc. of power equipment shelf depreciation class defect.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention is directed to propose a kind of compound field electric power electricity based on high-frequency current method
Cable detection system utilizes the part of HF current transformer (high frequency current transformer, HFCT)
Discharge detecting technique is diagnosed and is identified to silicon rubber shelf depreciation under compound field.For this purpose, the technical side that the present invention uses
Case is that high-frequency current method compound field intermediate joint of electric cable partial discharge detecting system is filled by compound field shelf depreciation
It sets, high-frequency current signal acquisition unit, data transmission unit, data processing unit composition；The compound field shelf depreciation dress
It sets comprising high-voltage DC power supply, the pulse power, voltage recombiner unit and simulation shelf depreciation device；The high-voltage DC power supply and
The output end of the pulse power connects the input terminal of the voltage recombiner unit；The simulation shelf depreciation device is by needle plate type
Electrode and silicon rubber sample are constituted；The high-voltage output end phase of the plate electrode and the recombiner unit of the needle plate type electrode
Even, another plate electrode is connected with the earth, is silicon rubber sample between two panels plate electrode, is inserted into steel in silicon rubber sample
Needle, the close plate electrode being connected with the earth in steel needle tip one end, steel needle tail portion one end and the High voltage output for being connected with recombiner unit
The plate electrode at end is in close contact；The high-frequency current signal acquisition unit is HF current transformer HFCT to obtain simulation
High-frequency current local discharge signal caused by shelf depreciation device；The collected signal of high-frequency current signal acquisition unit
It is exported after data transmission unit is transferred to data processing unit processing.
The HF current transformer HFCT uses the coiling of high magnetic permeability magnet ring, and the data processing unit includes amplification electricity
Road, filter circuit, detecting circuit and Voltage Feedback amplifying circuit and voltage regulator circuit.
The voltage recombiner unit is by the noninductive discharge resistance of two clovershrub high-pressure glass glaze high frequencies, three high pressure polyphenyl second
Alkene thin-film capacitor and measuring system are built, and the resistance plays metering function, and the capacitor plays a filtering role.
The measuring system is made of divider and oscillograph.
The high-voltage DC power supply is static spinning high-voltage power supply；The pulse power is by D.C. regulated power supply, one
A high voltage package and an IGBT are that the circuit module of main devices is constituted, and D.C. regulated power supply output end connects its of high voltage package
In an input port, the collector C connection of another input port of high voltage package and IGBT, IGBT emit collector E ground connection, the grid of IGBT
The signal source of G connection generation pulse.
The features of the present invention and beneficial effect are:
1, realize while applying DC voltage and pulse voltage, can accurate simulation cable intermediate joint operating condition, and
And the switching of positive and negative direct current voltage source is quick, guarantees experiment safety.The output voltage and frequency of pulse voltage are adjustable, guarantee function
It can be perfect.
2, HFCT uses the coiling of high magnetic permeability magnet ring, can more be accurately captured local discharge signal, can effectively go
Except part interference signal.
3, host analysis is powerful, has data comparison library and analytical model, can consult store historical data, and energy
Enough self-defining picture numbers and date, from two kinds of spectrogram Cooperative Analysis local discharge characteristics of PRPD and PRPS, and carry out mode
Identification, can automatic report generation and by plug SD card export report.
4, have a variety of graphic parameter setting functions, visualization decrease of noise functions can be carried out, it can given threshold and sampling interval
And supply frequency etc..
5, fully digitalization is shown, interface is more intuitive, concise, and handheld device interaction is friendly.
6, compared with existing detection technique and detection device, the present invention can accurate simulation intermediate joint of electric cable in reality
Generated local discharge signal under the operating condition of border, detection is accurate, is convenient for staff's operation setting and diagnosis, using based on high frequency
The detection system of current method has more advantage, can be realized accurate signal capture, guarantees that safe operation is reliable.
7, signal processing unit and signal display unit are fully integrated on a handheld device, more portable, data are transmitted more
Rapidly, sample rate is higher, can really realize real-time data transmission and acquisition.
Detailed description of the invention:
Fig. 1 is voltage recombiner unit circuit interconnect pattern of the invention；
Appended drawing reference: 1- DC power supply, 2- capacitor, 3- resistance, 4- capacitor, 5- resistance, 6- divider, 7- capacitor, 8-
Capacitor, 9- pin electrode, 10- silicon rubber sample, 11- plate electrode, 12- high voltage package, 13-IGBT circuit module, 14- signal occur
Device, 15- D.C. regulated power supply, 16- oscillograph, 17- HF current transformer HFCT, 18- handheld device
Fig. 2 is signal pickup assembly structural block diagram of the invention；
Fig. 3 is HF current transformer HFCT outside drawing of the invention；
Fig. 4 is host interface of the invention.
Specific embodiment
It is an object of the invention to overcome deficiency in the prior art, a kind of compound field based on high-frequency current method is provided
Power cable detection system, using the Partial Discharge Detecting Technology of HFCT sensor, to silicon rubber shelf depreciation under compound field
Defect is diagnosed and is identified.
The present invention detects power cable shelf depreciation with high-frequency current method under compound field for one kind, especially
It is to be related to one kind by handheld device in real time to power cable Partial Discharge Detection, is connected by sensor with host, it will be local
Discharge signal high speed is efficiently passed to host signal processing unit and then shows, has easy to operate, and signal transmission is fast, just
In carrying and the feature of high sensitivity, and then the detection system that description power cable insulation deteriorates in terms of shelf depreciation.
In order to solve the technical problem, the technical solution of proposition is the present invention: the compound field electric power electricity based on high-frequency current method
Cable detection system, mainly by compound field shelf depreciation device, high-frequency current signal acquisition unit, data transmission unit, data
Five parts of processing unit and host display unit are constituted；
The compound field shelf depreciation device includes high-voltage DC power supply, the pulse power, voltage recombiner unit and simulation
Shelf depreciation device；The high-voltage DC power supply connects the input terminal of the recombiner unit with the output end of the pulse power；
The data transmission unit is used for transmission the collected signal of high-frequency current signal acquisition device；
The data processing unit include amplifying circuit, filter circuit, detecting circuit and Voltage Feedback amplifying circuit and
Voltage regulator circuit；
The Voltage Feedback amplifying circuit connects the input terminal of display unit with the output end of voltage regulator circuit；
The data processing unit is used to acquire local discharge signal and carry out the processing of signal, by amplifying circuit, filter
Signal is sent into microprocessor chip by wave circuit, detecting circuit and Voltage Feedback amplifying circuit and voltage regulator circuit；
The host display unit, which is used to obtain from data processing unit, is transmitted through the data come, and carries out shelf depreciation phase
The described point of spectrogram and pulse train phase spectrogram the results are shown on handheld device interface, and can carry out data storage and reading
It takes；
The pulse power is by a D.C. regulated power supply, a signal generator, a high voltage package and an IGBT
It is constituted for the circuit module of main devices；
The data transmission unit is integrated in HFCT signal transmssion line；
The HFCT signal transmssion line is that BNC co-axial high-frequency radio frequency lines realize effective biography to signal using both ends
It is defeated；
The amplifying circuit is realized using two Analog Devices company broadband low noise ADL5545 chip-in series
Second level amplification；
For the filter circuit using two second order filter MAX262 as core, each filter includes two cascade integrals
Device and an adder；
The detecting circuit is made of HER102 HF schottky diode and RC charge-discharge circuit；
2 times of amplifications that the Voltage Feedback amplification and voltage regulator circuit are realized using two operational amplifiers in AD8056 chip
With voltage with.
In the following with reference to the drawings and specific embodiments, the compound field electricity of the invention based on high-frequency current method is further illustrated
How power cable intermediate head partial discharge detection system is realized.
Present invention is primarily intended to realize that the insulation performance to compound field intermediate joint of electric cable is detected, diagnosed
And assessment, state-detection is carried out from multi-angle to partial discharge quantity, and rely on the exhibition that handheld device carries out shelf depreciation degree
It is existing.The purpose of the present invention locally puts silicon rubber by HFCT sensor under the compound field based on DC voltage and pulse voltage
Electricity is detected, and collected local discharge signal is passed to data processing unit by transmission unit, and data that treated are by holding
The display unit of equipment is shown.
As shown in Figure 1, DC power supply 1 described in the present embodiment is made of the gentle and quiet Electrospun high voltage power supply in east, model DW-
P503-1ACDF, output voltage stabilization, maximum voltage value can reach 50kv.
The model CB81 of high pressure polystyrene film capacitor described in the present embodiment 2, capacitance 1000pF, pressure resistance etc.
Grade 50kV；The model RI80 of the noninductive discharge resistance 3 of clovershrub high-pressure glass glaze high frequency, resistance value are 1M Ω；It is described two
Concatenated capacitor 7,8 is the noninductive absorbing membrane capacitor of polypropylene high pressure, is produced by EACO company, model EACO-MS,
Capacity is 0.1 μ F, pressure voltage 8000V.
Divider 6 is made of capacitor 4 and resistance 5 in measuring system described in the present embodiment, intrinsic standoff ratio 1000:1, partial pressure
Device and oscillograph 16 collectively constitute measuring system, for measuring and showing the numerical value of on-load voltage.
Simulation shelf depreciation device described in the present embodiment is made of a needle plate type electrode and silicon rubber sample 10.Institute
A pin electrode 9 for stating needle plate electrode is connected with the high-voltage output end of the recombiner unit, and plate electrode 11 is connected with the earth, needle
Electrode is the steel needle that radius of curvature is 50 μm, the plate electrode 2mm that steel needle tip one end distance is connected with the earth, steel needle tail portion one
The plate electrode for holding and being connected with the high-voltage output end of recombiner unit is in close contact.The silicon rubber sample is side length 40mm, thick 4mm
Square sheets.
The pulse power described in the present embodiment is by a high pressure of signal generator 14, one of D.C. regulated power supply 15, one
Packet 12 and an IGBT are that the circuit module 13 of main devices forms, and the model of the D.C. regulated power supply steps victory MP2030D.
The signal generator is general source DG100 series of functions generator.The high voltage package signal is APS-08023.The IGBT electricity
Road module includes the high-power IGBT of a model H20R1203TO-247, a three column connecting terminals and a cooling fin group
At.
The high-frequency current signal acquisition device is HF current transformer HFCT 17, and HF current transformer HFCT is adopted
With high magnetic permeability magnet ring coiling, internal threads are fine copper coiling, and magnetizer is used silicon steel material, sealed using epoxy resin
Dress, HF current transformer HFCT get high-frequency current local discharge signal caused by silicon rubber insulation by handheld device 18
Display.
As shown in Fig. 2, the present invention is based on the compound field intermediate joint of electric cable Partial Discharge Detections of high-frequency current method
System, the local discharge characteristic research for silicon rubber under the electric field operating condition of researching DC composite pulse.It include: compound field silicon
Rubber shelf depreciation device, HF current transformer HFCT signal pickup assembly, data transmission unit, data processing unit and master
Machine display unit.
The signal pickup assembly of HF current transformer HFCT described in the present embodiment obtaining local discharge signal, including
The HFCT sensor that is sequentially connected in series, signal transmssion line, amplifying circuit, filter circuit, detecting circuit and Voltage Feedback amplification and
The output end of voltage regulator circuit, the Voltage Feedback amplification and voltage regulator circuit is connected to the input terminal of host display unit.
Amplifying circuit two described in the present embodiment Analog Devices company broadband low noise ADL5545 chip-in series
The second level of realization is amplified, and the detecting circuit is made of HER102 HF schottky diode and RC charge-discharge circuit, capacitance
1nF and resistance value 5M Ω, the Voltage Feedback amplification and voltage regulator circuit are realized using two operational amplifiers in AD8056 chip
2 times amplification and voltage follow.
When shelf depreciation occurs for cable intermediate joint, the pulse current that the duration is only ns grades can be generated, is inspired
Electromagnetic wave can penetrate poured with epoxy resin layer, when the magnetic field in measurement position changes, by HFCT sensor
The integrating resistor of Rogowski coil, so that it may experience pulse signal, then be sent into signal at signal by transmission unit
Unit is managed, needs to amplify circuit herein and amplifies, then needs to filter out the external worlds such as interference noise, such as Hz noise
Signal, signal carry out detection after filtering.
The signal display unit is using high-performance STM32 series A RM chip as microprocessor (MCU)；Specific method
It is the A/D conversion module carried using high-performance ARM chip, the previous stage analog signal received is converted into digital signal,
Measured discharge signal relies on TFT-LCD (Thin Film Transistor-LCD) to show in the form of pulse number and phase
Come.
Power supply is powered using built-in lithium battery, the battery last working time 6 hours or more, is embedded into handheld device, side
Portable belt uses.
Compound field intermediate joint of electric cable partial discharge detecting system based on high-frequency current method of the invention, specifically
Use environment and its method it is as follows:
1, use environment
Height above sea level :≤1000m
Operating temperature: -20 DEG C -40 DEG C
Working relative humidity: 0-90%, no condensation
Without fire, explosion danger, pollution severity chemical attack, high vibration, strong electromagnetic and lightning stroke place are tested and set
It is standby to want good earth
2, application method
(1) silicon rubber insulation sample making step
1. grand 705 silicon rubber of Jiao Ye Co., Ltd temmoku board in Liyang City is used in this example, by uncured silicon rubber
It pours into the mold of wide 40mm, with a thickness of 4mm, the uncured silicon rubber with mold is put into vacuum tank and is vacuumized.
Vulcanize 72 hours at room temperature 2. the silicon rubber after vacuumizing is placed.
3. it is 40mm that the silicon rubber after vulcanization, which is removed from the molds, and is cut into length and width, the thin slice of thick 4mm.
4. the steel needle that radius of curvature is 50 μm is inserted in parallel into silicon rubber thin slice middle position, make apart from upper surface and following table
Identity distance is from being 2mm, and needle point is apart from bottom surface 2mm.
(2) Partial Discharge Detection step
1. two flat poles are placed on platform and are fixed relatively, distance is set as 40mm between electrode, by silicon rubber
Glue sample is put between the electrodes, and ensures that electrode seal is fitted on sample.
2. set the voltage magnitude of the high-voltage DC power supply as 5kV, set the pulse voltage amplitude 5kV frequency as
200Hz, by HFCT sensor card on ground line.
3. the voltage magnitude that increase pulses voltage generates, the magnetic field when shelf depreciation occurs for silicon rubber, in measurement position
When changing, pass through the integrating resistor of the Rogowski coil in HFCT sensor, so that it may experience pulse signal, obtain
It can send to effective acquisition pulse signal of ARM, after A/D digital-to-analogue conversion, discharge signal is with the shape of pulse number and phase
Formula relies on TFT-LCD (Thin Film Transistor-LCD) to show.Host also provides handheld device interface and data simultaneously
Storage and query function, and real-time update acquires data.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (5)
1. a kind of high-frequency current method compound field intermediate joint of electric cable partial discharge detecting system, characterized in that by compound
Electric field shelf depreciation device, high-frequency current signal acquisition unit, data transmission unit, data processing unit composition；It is described compound
Electric field shelf depreciation device includes high-voltage DC power supply, the pulse power, voltage recombiner unit and simulation shelf depreciation device；It is described
High-voltage DC power supply connects the input terminal of the voltage recombiner unit with the output end of the pulse power；The simulation is locally put
Electric installation is made of needle plate type electrode and silicon rubber sample；A plate electrode and the recombiner unit for the needle plate type electrode
High-voltage output end be connected, another plate electrode with greatly be connected, be silicon rubber sample, silicon rubber between two panels plate electrode
Be inserted into steel needle in sample, the close plate electrode being connected with the earth in steel needle tip one end, steel needle tail portion one end be connected with compound list
The plate electrode of the high-voltage output end of member is in close contact；The high-frequency current signal acquisition unit is HF current transformer HFCT
To obtain high-frequency current local discharge signal caused by simulation shelf depreciation device；The high-frequency current signal acquisition unit
Collected signal is exported after data transmission unit is transferred to data processing unit processing.
2. high-frequency current method compound field intermediate joint of electric cable partial discharge detecting system as described in claim 1,
It is characterized in, the HF current transformer HFCT uses the coiling of high magnetic permeability magnet ring, and the data processing unit includes amplification electricity
Road, filter circuit, detecting circuit and Voltage Feedback amplifying circuit and voltage regulator circuit.
3. high-frequency current method compound field intermediate joint of electric cable partial discharge detecting system as described in claim 1,
It is characterized in, the voltage recombiner unit is by the noninductive discharge resistance of two clovershrub high-pressure glass glaze high frequencies, three high pressure polyphenyl second
Alkene thin-film capacitor and measuring system are built, and the resistance plays metering function, and the capacitor plays a filtering role.
4. high-frequency current method compound field intermediate joint of electric cable partial discharge detecting system as described in claim 1,
It is characterized in, the measuring system is made of divider and oscillograph.
5. high-frequency current method compound field intermediate joint of electric cable partial discharge detecting system as described in claim 1,
It is characterized in, the high-voltage DC power supply is static spinning high-voltage power supply；The pulse power is by a D.C. regulated power supply, one
High voltage package and an IGBT are that the circuit module of main devices is constituted, and D.C. regulated power supply output end connects high voltage package wherein
The collector C connection of one input port, another input port of high voltage package and IGBT, IGBT emit collector E ground connection, the grid G of IGBT
Connection generates the signal source of pulse.
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Cited By (5)
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| CN111722169A (en) * | 2020-06-10 | 2020-09-29 | 深圳供电局有限公司 | Anti-interference performance detection device and method of high-frequency partial discharge detector |
| CN112924825A (en) * | 2020-12-30 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Medium-voltage cable partial discharge test defect simulation detection method and system |
| CN114089135A (en) * | 2021-11-19 | 2022-02-25 | 南京征途信息技术有限公司 | Partial discharge sensor for variable distribution high-frequency current and method thereof |
| CN114200371A (en) * | 2021-08-09 | 2022-03-18 | 威凯检测技术有限公司 | A ability verification device for electrostatic discharge immunity is experimental |
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| CN208092189U (en) * | 2018-04-26 | 2018-11-13 | 天津学子电力设备科技有限公司 | Compound field based on superfrequency method couples paper oil insulation partial discharge detecting system |
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