CN107782991A - Based on LaBVIEW middle voltage distribution networks feeder pillar cable termination intelligent online monitoring systems - Google Patents
Based on LaBVIEW middle voltage distribution networks feeder pillar cable termination intelligent online monitoring systems Download PDFInfo
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- CN107782991A CN107782991A CN201610765194.3A CN201610765194A CN107782991A CN 107782991 A CN107782991 A CN 107782991A CN 201610765194 A CN201610765194 A CN 201610765194A CN 107782991 A CN107782991 A CN 107782991A
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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
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Abstract
基于LaBVIEW中压配网分支箱电缆终端智能在线监测系统，包括多个监测现场单元采集子系统和上位机平台，所述采集子系统内包括用于检测故障电压的电压传感器、测量线路电流的电流互感器、故障电流的电流传感器、测量电缆接头温度的表带式测温传感器、GSM数据发送模块、微处理器及CT+超级电容供电系统，所述上位机采用的是基于LABVIEW平台开发的上位机，用于中压配网分支箱电缆终端数据实时显示与存储，整个系统实现了电缆终端温度大小与预警信息、线路电流故障信息及带电状态信息的实时监测，功能集成度高，满足分支箱内信息通讯实时性和高速性的需求，保证了系统运行的可靠性、监测的实时性，具有巨大优势和广阔前景。
Based on LaBVIEW medium-voltage distribution network branch box cable terminal intelligent online monitoring system, it includes multiple monitoring field unit acquisition subsystems and a host computer platform, and the acquisition subsystem includes voltage sensors for detecting fault voltages and current measuring line current Transformer, current sensor for fault current, strap-type temperature sensor for measuring cable joint temperature, GSM data transmission module, microprocessor and CT+ supercapacitor power supply system, the upper computer is based on the upper computer developed on the LABVIEW platform , used for real-time display and storage of cable terminal data in medium-voltage distribution network branch boxes. The whole system realizes real-time monitoring of cable terminal temperature and early warning information, line current fault information and live state information. The demand for real-time and high-speed information communication ensures the reliability of system operation and real-time monitoring, which has great advantages and broad prospects.
Description
Technical field
The present invention relates to electric intelligent on-line monitoring technique field, specially based on LaBVIEW middle voltage distribution networks feeder pillar electricity
Cable terminal intelligent on-line monitoring system.
Background technology
With the development of intelligent grid, the status information of electrical equipment is obtained in real time in the intelligent construction of power system
It is very crucial, one of tap in distribution feeder pillar equipment important as power system, and safe operation of power system
In weakest link, influenceed when it is primarily due to make by site environment unfavorable factor and manufacture craft limit
System, the crimp quality of joint is caused potential hidden danger to be present, and the crimp quality of tag, it can only be able in operation
Inspection, after high current (overload) operation after a while, phenomena such as overheating, aoxidizing is produced in pressure junction, causes to connect
Getting an electric shock, gradually increase, temperature of cable junction can be raised further for resistance, make insulation ag(e)ing, the life-span die-offs, and ultimately results in insulating barrier
Damage and the generation that causes the accident, according to statistics, cable connector accident rate accounts for the 90% of cable fault, in order to ensure electric cable fitting
Safety, need to grasp the real-time change of distribution feeder pillar nipple temperature on time, and cable termination data are analyzed, using phase
The solution answered, therefore, seek a kind of system to realize that the on-line monitoring of distribution feeder pillar is extremely urgent, and it is reasonable in design
Distribution feeder pillar monitoring system can provide technology guarantee and scientific basis for the reliability of power supply.
Originally distribution feeder pillar monitoring is completed by manual inspection mode, needs site inspection temperature of cable junction feelings
Condition, not only existing maintenance is superfluous in maintenance or overhauls the problems such as insufficient, also expends a large amount of human and material resources.
The power supply mode of high pressure on-line monitoring system mainly has at present：
It is solar powered, with reference to battery, a kind of more commonly used mode, but it is larger by such environmental effects, and night
Between fully rely on storage battery power supply, power supply reliability is low.
Laser powered sensor, have the advantages that high-pressure side and low-pressure side without electrical connection, its power supply not by net side influence of fluctuations, but
It is relatively low to there is conversion efficiency, short life, and the problem of periodic maintenance.
Sensing electricity getting device, small volume, on wire be set with taking energy coil induce alternating voltage, through over commutation, filtering,
Dc source is exported after voltage stabilizing, while power supply can reliably energize to high-pressure side electronic installation, ensures reliable insulation over the ground,
But the sensing power taking studied at present, it is largely that sensing electricity taking coil is combined and special taking energy coil with lithium battery, its
Shortcoming one：The narrow range of the operating temperature of lithium battery, charging temperature is above freezing, and some colder areas, lithium battery is in outdoor
It can not be charged；The finiteness of its discharge and recharge number causes periodically to need to change；Shortcoming two：Oneself special taking energy coil
The degree of reliability is not high, is related to many mechanical technology designs, mechanical strength and electric strength are difficult to ensure that.
The content of the invention
It is an object of the invention to provide monitor to be based on LaBVIEW middle voltage distribution networks feeder pillar cable terminations intelligent online
System, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides following technical scheme：It is whole based on LaBVIEW middle voltage distribution networks feeder pillars cable
Intelligent online monitoring system is held, its composition includes：Acquisition subsystem, it is characterized in that：Described acquisition subsystem includes being arranged on
The detection voltage sensor of false voltage, the current transformer of measurement circuitry electric current, the electric current of fault current on cable run
Sensor, the watchband type temperature transducer for measuring temperature of cable junction, GPRS data sending module, microprocessor and CT+ are super
Capacitances to supply power system, the open-close type CT that described CT+ super capacitors electric power system includes aerating gap make induction energy fetching coil and tied
Super capacitor is closed, alternating current is induced and is realized via electric energy modulate circuit to monitoring device power supply, added by the opening and closing place in CT
The mode of air gap can effectively reduce relative permeability, prevent the too early saturations of CT, CT is operated in linear zone.
Preferably, described to be united based on LaBVIEW middle voltage distribution networks feeder pillar cable termination intelligent onlines monitoring system, it is special
Sign is：Described host computer, as development environment, based on the core of NI design platforms, is used graphical using Labview
Author language G writes program, and the display directly perceived of data and the storage of data can be achieved.
Preferably, it is described based on LaBVIEW middle voltage distribution networks feeder pillar cable termination intelligent online monitoring systems, its feature
It is：The communication of data is carried out between described acquisition subsystem and host computer using GPRS wireless transmission methods.
Compared with prior art, the beneficial effects of the invention are as follows：It is punctual to grasp the real-time of distribution feeder pillar nipple temperature
Change, and cable termination data are analyzed, using corresponding solution, therefore, seek a kind of system to realize distribution
The on-line monitoring of feeder pillar is extremely urgent, and distribution feeder pillar monitoring system reasonable in design can provide for the reliability of power supply
Technology ensures and scientific basis, the advantages of power supply with, directly do taking energy coil (open-close type CT) with open-close type current transformer,
And combining super capacitor serves as lithium battery, the adaptability of environment, reliability of operation are improved, and is easy to the dimension in later stage
Shield.
Brief description of the drawings
Fig. 1 is the structural principle block diagram of this product.
In figure, 1, circuit voltage sensor, 2, current transformer, 3, current sensor, 4, watchband type temperature transducer, 5,
GPRS data sending module, 6, microprocessor, 7, CT+ super capacitor electric power systems, 8, host computer.
Fig. 2 is the taking energy coil structure chart after opening air gap of this product power unit.
Fig. 3 is the taking energy coil air-gap-free secondary side output voltage simulation waveform of this product power unit.
Fig. 4 is that the taking energy coil of this product power unit has air gap secondary side output voltage simulation waveform.
Fig. 5 is magnetization curve before and after this product power unit taking energy coil aerating gap.
Fig. 6 is the structure principle chart of the electric energy process circuit of this product power unit.
Fig. 7 is that the DC-DC automatic liftings of this product power unit press mu balanced circuit.
Fig. 8 is the taking energy coil air-gap-free secondary side output voltage measured waveform of this product power unit.
Fig. 9 is that the taking energy coil of this product power unit has air gap secondary side output voltage measured waveform.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, based on the embodiment in the present invention, those of ordinary skill in the art institute under the premise of creative work is not made
The every other embodiment obtained, belongs to the scope of protection of the invention.
Fig. 1-9 are referred to, the present invention provides a kind of technical scheme：Based on LaBVIEW middle voltage distribution networks feeder pillar cable terminations
Intelligent online monitoring system, its composition include：Acquisition subsystem, it is characterized in that：Described acquisition subsystem includes being arranged on electricity
The detection voltage sensor 1 of false voltage, the current transformer 2 of measurement circuitry electric current, the electric current of fault current on cable road
Sensor 3, watchband type temperature transducer 4, GPRS data sending module 5, microprocessor 6 and the CT+ for measuring temperature of cable junction
Super capacitor electric power system 7, the open-close type CT that described CT+ super capacitors electric power system 7 includes aerating gap make induction energy fetching line
Simultaneously combining super capacitor is enclosed, alternating current is induced and is realized via electric energy modulate circuit to monitoring device power supply, pass through opening in CT
The mode of aerating gap can effectively reduce relative permeability at conjunction, prevent the too early saturations of CT, CT is operated in linear zone, be based on
LaBVIEW middle voltage distribution networks feeder pillar cable termination intelligent online monitoring systems, it is characterized in that：Described host computer 8 uses
LaBVIEW based on the core of NI design platforms, uses graphical author language G to write program as development environment, can be real
The display directly perceived of existing data and the storage of data, use the GPRS sides of being wirelessly transferred between described acquisition subsystem and host computer 8
Formula carries out the communication of data.
For power supply in design by the way of CT+ super capacitors, its principle is as follows：
Current transformer is actually a kind of special transformer, using the law of electromagnetic induction as operation principle.
Show that secondary induced electromotive force virtual value is as follows：
When unloaded, N2I2=0, it is known that Im=I1。
Now analyzed, gained knowledge from motor, it is generally the case that the magnetic material such as iron core for the excitation principle of iron core
The hysteresis characteristic curve of material is not linear.
To make its linear, magnetization curve slope can be suitably reduced；By formula Bm=μ0μrHmUnderstand, reduce magnetic conductivity,
Effectively slow down coil and saturated phenomenon occur, after increasing magnetic resistance, the linear zone of core magnetism performance curve will increase, and then lift magnetic
Material resists magnetized ability.
The expression formula of core reluctance and air-gap reluctance：
Wherein, SeqFor magnetic core net sectional area, δ is magnetic core air gap length.
It can be obtained according to magnetomotive force equation and ohm's law for magnetic circuit：
It is various by more than to bring ohm's law for magnetic circuit into, it is known that equivalent relative permeability μeqFor：
The relative permeability of magnetic material is usually quite greatly, and after iron core plus air gap delta=1mm, μ is understood from formulaeqMagnetic conductance
Rate substantially reduces；So it is to reduce the effective ways of magnetic conductivity that magnetic material, which opens air gap mode,.
From Electrical Motor, magnetic material maximum exciting current is only relevant with itself, it is known that
Wherein, ironcore choke outer diameter D, internal diameter d, height a.
If reducing relative permeability unshakable in one's determination, maximum exciting current IEmax can become big, therefore bus electricity can be widened by introducing air gap
Working range is flowed, the linear zone of CT work is increased, prevents the too early saturation of iron core.
Referring to Fig. 2, the structure chart before and after aerating gap.
In order to verify that above-mentioned theory derives, emulated with Saber softwares, first according to this CT taking energy coils structure and ginseng
Number, taking energy coil model is established with the Transformer Modeling module MCT carried in software, including magnetization curve, size, material,
The parameters such as air gap, lamination coefficient, umber of turn, thickness, and emulated by unloaded model, once survey and inject different current value i
(m) the magnitude of voltage u that, secondary side obtains2, Fig. 3-4, air-gap-free simulation figure unshakable in one's determination are referred to, iron core has air gap delta ≈ 1.07mm to imitate
True figure.
After two it can be seen from the figure that aerating gaps, maximum exciting current is increased significantly to kilo-ampere level, by the imitative of (b) two width figure
When true result is shown in primary current amplitude and reaches 1414A (virtual value 1000A), secondary side output waveform is substantially sine wave,
When current amplitude is equal to 1500A, secondary side output voltage wave has occurred and that distortion.
Refer to magnetization curve before and after Fig. 5 establishes taking energy coil model its aerating gap with MCT.
As can be seen from the figure the magnetic conductivity after aerating gap substantially reduces, and the μ that simulation software calculateseq=393.5, by
Do not added in magnetic circuit value in the gas length of theoretical value and the reason such as lamination coefficient causes error, its value and theoretical value
366.53 relative error be 6.85%.
Fig. 6-7 are referred to, the AC electromotive force U induced due to secondary side2, it is necessary to given through over commutation processing unit
Line monitoring device, there is lightning impulse current and transient fault high current in short-term because circuit is unavoidable, need to be to late-class circuit
Frequency converter is carried out, therefore transient supression diode (TVS) has been used before rectifier bridge, limits the impact electricity of induction coil output
Pressure, wherein parallel resistance R1 can not only prevent CT from opening a way, and electric energy process circuit can also be loaded and be adjusted；On the one hand can
With harmonic wave caused by eliminating commutation diode nonlinear elements, CT is caused to have noise；On the other hand, can make CT secondary sides etc.
Imitate resistance to reduce, to increase load current, reduce exciting current, prevent the too fast saturations of CT.
In order to prevent rear class Voltage stabilizing module from being damaged because input voltage is too high, palpus over-voltage, ensure safe voltage control
System forms voltage by D8, R3, R4, R6 and N-channel MOS TFET as shown in Figure 7 in the range of the maximum input voltage of Voltage stabilizing module
Protection and energy leadage circuit, work as UdcVoltage be more than 30V, pipe will turn on, so as to by excess energy discharge in 30 Ω work(
On rate 10W resistance R4, ensure circuit safety.
DC-DC automatic liftings pressure Voltage stabilizing module, the Voltage stabilizing module using LM2577S as the wide range input voltage of core are interior
Portion's switching frequency realizes boosting and decompression up to 50kHz using Buck-Boost principles.
Refer to Fig. 8-9 and first verify that Part II taking energy coil adds the operation characteristic after air gap delta ≈ 1.07mm, use thickness
About 0.5mm two sheet materials are added in the both ends of open-close type current transformer, and CT is tested bis- times there is employed herein FLUKE 199C
Side output voltage wave, primary current value scope are added to 1200A from 0A, and Fig. 8 is the secondary side output waveform for not having aerating gap, and 9 are
After CT aerating gaps, the Ohmic resistance of taking energy coil band 200 loads output waveform, Fig. 8 under 400A, 800A, 1000A, 1200A electric current
Distortion is just had occurred and that in primary current 100A, when primary current increases to 200A, distort very serious, the serious saturations of CT；Fig. 9
In can draw and work as I1CT secondary sides voltage waveform somewhat distorts during=1000A, works as I1During=1200A, Severe distortion can
Know that aerating gap significantly increases the linear zone of CT work.
Claims (3)
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| CN201610765194.3A CN107782991A (en) | 2016-08-29 | 2016-08-29 | Based on LaBVIEW middle voltage distribution networks feeder pillar cable termination intelligent online monitoring systems |
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| CN201610765194.3A CN107782991A (en) | 2016-08-29 | 2016-08-29 | Based on LaBVIEW middle voltage distribution networks feeder pillar cable termination intelligent online monitoring systems |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095205A (en) * | 2019-05-05 | 2019-08-06 | 新奥数能科技有限公司 | A kind of system monitoring cable temperature |
| CN110763348A (en) * | 2019-11-08 | 2020-02-07 | 广州供电局有限公司 | Cable joint temperature monitoring device and system |
| CN110794198A (en) * | 2019-10-15 | 2020-02-14 | 北京国电通网络技术有限公司 | Safety monitoring device for electric appliance line |
| CN110854996A (en) * | 2019-10-16 | 2020-02-28 | 三门振兴电力发展有限公司 | Networked 10kV Intelligent Fast User Incoming Line Demarcation Type Cable Branch Box Online Monitoring System |
| CN113126003A (en) * | 2020-01-10 | 2021-07-16 | 北京百度网讯科技有限公司 | Method and device for determining cable crimping quality |
| CN113630000A (en) * | 2021-07-23 | 2021-11-09 | 商飞信息科技（上海）有限公司 | Novel multi-topology direct-current voltage converter for direct-current micro-grid |
-
2016
- 2016-08-29 CN CN201610765194.3A patent/CN107782991A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095205A (en) * | 2019-05-05 | 2019-08-06 | 新奥数能科技有限公司 | A kind of system monitoring cable temperature |
| CN110794198A (en) * | 2019-10-15 | 2020-02-14 | 北京国电通网络技术有限公司 | Safety monitoring device for electric appliance line |
| CN110854996A (en) * | 2019-10-16 | 2020-02-28 | 三门振兴电力发展有限公司 | Networked 10kV Intelligent Fast User Incoming Line Demarcation Type Cable Branch Box Online Monitoring System |
| CN110763348A (en) * | 2019-11-08 | 2020-02-07 | 广州供电局有限公司 | Cable joint temperature monitoring device and system |
| CN113126003A (en) * | 2020-01-10 | 2021-07-16 | 北京百度网讯科技有限公司 | Method and device for determining cable crimping quality |
| CN113630000A (en) * | 2021-07-23 | 2021-11-09 | 商飞信息科技（上海）有限公司 | Novel multi-topology direct-current voltage converter for direct-current micro-grid |
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