CN104391226B - A kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal and acquisition method - Google Patents

A kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal and acquisition method Download PDF

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Publication number
CN104391226B
CN104391226B CN201410708231.8A CN201410708231A CN104391226B CN 104391226 B CN104391226 B CN 104391226B CN 201410708231 A CN201410708231 A CN 201410708231A CN 104391226 B CN104391226 B CN 104391226B
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China
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concave surface
casing
box
gather
line
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CN201410708231.8A
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CN104391226A (en
Inventor
张页
庄晓丹
苏毅方
陈蕾
朱义勇
卢峰
蒋建杰
周安仁
刘笑园
季旭
张兵
林才富
钦伟
崔小菱
邢翼
岑梁
黄益军
王震宇
李波
聂峥
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State Grid Corp of China SGCC
Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Changxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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State Grid Corp of China SGCC
Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Changxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Abstract

The invention discloses a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal and acquisition method,The chamber door being connected including casing and with casing,Described body side is provided with side concave surface,Three monophase current signal input ports and a short-distance wireless receiving unit for being used to receive single-phase fault indicator signal are provided with the concave surface of side,Sealing is fixed with side box on the concave surface of side,The top of casing is provided with top concave surface,Top is provided with GPRS wireless signal transmitters in concave surface,Sealing is fixed with skylight box on the concave surface of top,Described monophase current signal input port is aviation socket,Described casing and side box,Skylight box,Sealed between chamber door by dual-seal bar sealing structure,The advantages of this programme, is that can gather the wireless malfunction signal that single-phase instantaneous current signal and intelligent line failure device provides simultaneously carries out analysis calculating,It is capable of the singlephase earth fault of accurate judgement small current neutral grounding system.

Description

A kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal and collection Method
Technical field
The present invention relates to a kind of acquisition terminal and acquisition method for monitoring line fault on-line.
Background technology
Distribution line long transmission distance, branch line are more, more extremely difficult in network structure, its trouble shoot.If distribution wire Road on-line monitoring acquisition terminal is engaged with intelligent line fault detector, can monitor the normal operation of circuit in real time like that With failure generating process, detect and indicate short circuit and earth fault, if the technology is implemented be distribution line to operation maintenance Personnel understand the operation conditions of circuit, positioning, maintenance after failure generation etc. and brought great convenience in real time.
And for this technology, the fault location using the singlephase earth fault of small current neutral grounding system be distribution from One of difficult point that dynamicization is faced, firstly, since singlephase earth fault grounding resistance is larger, fault-signal is weak, destroys a lot The use condition of targeting scheme;Secondly, distribution network line branch of China is numerous, is had a great influence by load current, and each branch point Play the role of to decay and distort to transient signal, be unfavorable for improving accuracy of detection.
At present, the detection method of the singlephase earth fault of small current neutral grounding system generally has following several classes:
1:Signal injection method, program accuracy of detection is high, but needs to change a topological structure of transformer station, therefore does not obtain It is widely used;
2:Harmonic detection:Utilize magnetic saturation of the iron core equipment in power network in imbalance of three-phase voltage and caused harmonic wave Component, low current grounding is detected.
3:Zero-sequence current detection method:Occurred by comparing in singlephase earth fault front and rear zero-sequence current amplitude size and Direction, judge low current grounding;
4:First half-wave method:That transient state concussion caused by coupled capacitor over the ground of power network, sentences when being occurred using small current neutral grounding Disconnected low current grounding.
Numerous methods has its applicable situation and the degree of accuracy differentiated above, if single determination methods can not be complete Full being accurately finished single-phase grounded malfunction in grounded system of low current route selection of the task.Only on the basis of the various methods of summary On, the precision of single-phase earth fault line selection could be improved.And intelligent line fault detector conventional at present is generally only collection Monophase current.The program can substantially meet the requirement of phase fault detection, but for the singlephase earth fault of small current system, Singlephase earth fault can only be judged by detecting the transient signals such as first half-wave, seriously limit it and judge low current event The accuracy of barrier.
The content of the invention
The technical problem to be solved in the invention is to provide a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring Acquisition terminal and acquisition method, the wireless malfunction letter that single-phase instantaneous current signal and intelligent line failure device provides can be gathered simultaneously Number analysis calculating is carried out, be capable of the singlephase earth fault of accurate judgement small current neutral grounding system.
The technical scheme is that:A kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal, bag Casing and the chamber door being connected with casing are included, described body side is provided with side concave surface, and being provided with three monophase currents in the concave surface of side believes Number input port and a short-distance wireless receiving unit for being used to receive single-phase fault indicator signal, seal on the concave surface of side and fix There is side box, the top of casing is provided with top concave surface, pushes up and GPRS wireless signal transmitters are provided with concave surface, seals and be fixed with the concave surface of top Skylight box, described monophase current signal input port is aviation socket, between described casing and side box, skylight box, chamber door Sealed by dual-seal bar sealing structure.
Preferably, described dual-seal bar structure includes that two on the casing parallel and the annular sealing strip that sets, institute Side box, skylight box, the chamber door stated are provided with a single sealing ring being embedded between two annular sealing strips.
Preferably, two described annular sealing strips are respectively arranged on side concave sidewalls, top concave sidewalls, casing front openings In side wall.
Preferably, described casing lateral wall is provided with heat emission hole, and described heat emission hole outer wall is provided with rain cover.
Preferably, described heat emission hole is oblique, and outside open height is less than inner side open height.
Preferably, side port is provided with neck in described heat emission hole, and anti-dust filter mesh is provided with neck.
Preferably, described side box is provided with line outlet, and described side concave surface is located at the bottom of casing.
It is preferred that volume, described tank floor is inner sunken face, and described side concave surface is on inner sunken face.
Preferably, the power subsystem of described CT draw-out power supplies is photovoltaic cell or current-inducing power supply.
A kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition method is also provided in addition, and specific method is such as Under:
1:Combined with three single-phase circuit signal input ports by CT draw-out power supplies, directly obtained on three unilines Current signal, and this signal is transferred to the internal control circuit in acquisition terminal, carry out zero-sequence current detection and judge;Adopt simultaneously What the smart circuit fault detector that the short-distance wireless receiving unit in collection terminal is also received on each uniline was sent Fault-signal, and this signal is also transmitted to the internal control circuit in acquisition terminal, carry out first half-wave method detection and judge;
2:Two kinds of signals are carried out analysis judgement by internal control circuit, and when simultaneously, two kinds of signals of judgement are fault-signal When, this signal is transferred to GPRS wireless launchers;
3:GPRS wireless launchers finally send signal by long distance wireless network transmissions to master station, and by the system of master station Go out personnel to be investigated or investigated on the spot online.
After the technical program, distribution line monitors acquisition terminal on-line by wireless channel in a broadcast manner to each Intelligent line fault detector transmission Synchronous Sampling Pulse, the sampling flow of each intelligent line fault detector of synchronous averaging, Collection complete a cycle line current, to earth electric field after, distribution line monitor on-line acquisition terminal successively from each smart wire Line fault indicator calls the line current of this cycle, to earth electric field real time data, with this calculate three-phase zero-sequence current, Zero sequence can reflect residual voltage over the ground, the zero-sequence current in this programme to a certain extent to earth electric field to earth electric field, zero sequence Directly obtained by three monophase current signal input ports, the signal data that intelligent line fault detector is sent is then by short distance Radio receiving unit is received, and two kinds of data are gathered, are with reference to the advantages of rear simultaneously:
1:In small current neutral grounding system, in the event of singlephase earth fault, its residual voltage necessarily significantly raises.By In zero sequence, electric field energy reflects its residual voltage to a certain extent over the ground, therefore the signal also can just be sentenced as singlephase earth fault Disconnected entry condition.In the case of residual voltage is less, without carrying out the work of substantial amounts of operation and radio communication Make.The power consumption of distribution line on-line monitoring acquisition terminal will be greatly reduced in this, mitigate and distribution line on-line monitoring is adopted Collect the pressure of terminal supplying power system.
2:Due to the influence for being transient signal, being highly prone to interference of first half-wave method detection.Still more distribution line is online Monitoring acquisition terminal just operates in a highfield, in strongly disturbing environment.Secondly first half-wave method is sentenced with certain in itself Disconnected blind area, the premise of this method are to be occurred based on singlephase earth fault in phase voltage close to maximum moment.Zero-sequence current has Effect obtain, on the one hand can headed by half-wave method provide evidence, first half-wave judgement before and after, if zero-sequence current has larger ripple It is dynamic, you can further to affirm singlephase earth fault.On the other hand blind area when using first half-wave method merely can also be reduced.
Two methods gather simultaneously, and have complementary function, can more accurately judge uniline failure,
In addition, make use of water proof type aviation socket to replace original cable hole, to thoroughly being isolated inside and outside casing, Sealing rubber ring built in the aviation socket of water proof type can also avoid the influence of dust, water to box house electronic component, boat Blind plug, the structure of plug and play of aviation socket are also convenient for plugging exclusion line fault on the spot, without opening casing, avoid pair Damage caused by case in-body devices are possible, while the good airproof performance of whole casing, chamber door, side box, skylight box all use double containment Bar sealing structure, strengthen the waterproof and dustproof effect of whole casing, improve the reliability of equipment.
Brief description of the drawings
Accompanying drawing 1 is schematic diagram when casing merges with chamber door;
Accompanying drawing 2 is the schematic diagram of each part of the present invention;
Accompanying drawing 3 is the schematic diagram on the inside of heat emission hole;
Accompanying drawing 4 is the schematic cross-sectional view at heat emission hole;
Accompanying drawing 5 is the schematic diagram of dual-seal bar sealing structure;
Accompanying drawing 6 is the schematic diagram of tank floor inner sunken face;
Accompanying drawing 7 is the operating diagram of this acquisition terminal.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings:
As shown in Figures 1 to 7, a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal, including case Body 1 and the chamber door 2 being connected with casing, described body side are provided with side concave surface 11, and being provided with three monophase currents in the concave surface of side believes Number input port 31 and a radio receiving unit 32 for being used to receive single-phase fault indicator signal, three monophase current signals Input port is all connected to CT draw-out power supplies, and the power subsystem of described CT draw-out power supplies is preferably photovoltaic cell or electric current sense Power supply is answered, can be self-sufficient, it is not necessary to additionally to increase power supply, monophase current by illumination energy supply or electric current sensing energy supply Signal input port is combined with CT draw-out power supplies for obtaining the signal such as real-time current of each uniline in three-phase line, is sentenced Break malfunction, the radio receiving units such as the phase fault on road, single-phase earthing then obtains smart wire with the mode of wireless receiving The signal of road failure device, the sampling of synchronous each phase intelligent line fault detector, calculates zero-sequence current, zero sequence is to earth electric field, side Sealing is fixed with side box 3 on concave surface, and the top of casing is provided with top concave surface 12, pushes up in concave surface and be provided with GPRS wireless signal transmitters 41, it is connected by GPRS wireless public networks with main station system, and by the real-time current of three-phase line, the phase fault, right of circuit The timing of the malfunctions such as earth electric field, single-phase earthing reports main station system, to improve the response speed of failure, improves power supply matter Amount;Sealing is fixed with skylight box 4 on the concave surface of top, and skylight box is used to protect GPRS wireless signal transmitters 41, while prevents rainwater Penetrated into Deng by GPRS wireless signal transmitters 41 in casing, described monophase current signal input port is inserted for aviation Seat, CT draw-out power supplies, short-distance wireless receiving unit, GPRS wireless signal transmitters are connected with box house control circuit, aviation Socket matching is also referred to as military project socket, plug for aviation plug, aviation socket, plug, and original is used for aircraft and gained the name.It is existing It is being widely used in the fields such as navigation, space flight, electric power, enclosure material is sturdy and durable frequently with magnesium alloy.And aviation is inserted Seat, plug are closed with metal shell, and part prevents the interference of internal electromagnetic radiation or external electromagnetic field to device, can be achieved to insert Use, very convenient, three monophase current signal input ports are aviation socket in this example, convenient plug progress when detecting on the spot Individually investigation, is sealed between described casing and side box, skylight box, chamber door by dual-seal bar sealing structure.Using The advantages of this programme is to combine zero-sequence current detection method and first half-wave method, and zero-sequence current detection method is as singlephase earth fault The entry condition of judgement, in the case of circuit is normal, without carrying out the work of substantial amounts of operation and radio communication, The power consumption of distribution line on-line monitoring acquisition terminal is greatly reduced, mitigates and acquisition terminal power supply is monitored on-line to distribution line The pressure of system, the premise of first half-wave method detection is to be based on zero-sequence current detection method, effective acquisition of zero-sequence current, on the one hand may be used Headed by half-wave method provide evidence, first half-wave judgement before and after, if zero-sequence current has larger fluctuation, you can further certainly Singlephase earth fault, on the other hand can also reduce blind area when using first half-wave method merely, and two methods combine and improve failure The degree of accuracy of monitoring, and fault-signal is transferred to master station in time by GPRS wireless signal transmitters, it can be entered with the very first time Row failture evacuation, meanwhile, this terminal box body uses the sealing structure of waterproof and dustproof, can ensure the internal electron of acquisition terminal Element normal use does not malfunction, and further improves accuracy.
As shown in Figure 3 and Figure 4, described casing lateral wall is provided with heat emission hole 13, and described heat emission hole outer wall is provided with rain-proof Cover 14, heat emission hole can aid in electronic element radiating in casing, and installing additional can prevent after rain cover outside rainwater from dissipating Hot hole enters in casing, it is preferred that described heat emission hole is oblique, and outside open height is less than inner side open height, the design Advantage is:Casing is placed on outdoor, and some droplets can be many times assembled at heat emission hole lateral port, and these droplets can be because Influence to flow into casing for external force such as winds, the electronic component in casing is influenceed after making moist for a long time, heat emission hole is arranged to tilt Shape so that these droplets first have to overcome self gravitation to enter before casing is entered by external force, reduce casing and make moist Degree, reach most desired effect of course for by waterproof and dustproof effect, side port is provided with neck 15, neck in described heat emission hole It is interior to be provided with anti-dust filter mesh 16, because unique opening of whole casing is exactly at heat emission hole, dustproof filter is set in this place Unique channel that net can enter micronic dust casing is effectively contained, while anti-dust filter mesh typically has absorbing component, this part Absorbing component can also obstruct the droplet that a part overcomes self gravitation to enter in casing, and dust-proof, waterproof is neglected neither.
As shown in figure 5, by taking the junction of chamber door and casing as an example, described dual-seal bar sealing structure includes being located at casing On two parallel and the annular sealing strip 61 that sets, described side box, skylight box, chamber door are embedded in two annulars provided with one Single sealing ring 62 between sealing strip, two annular sealing strips that are parallel and setting are fixed on cabinet wall close to opening, and two Space is left among bar annular sealing strip, the space another sealing strip under can just filling in, i.e., the single sealing ring in this example 62, single sealing ring is interference fitted with two annular sealing strips respectively after stoppering, and outside water will enter in casing, then to pass through The protection of two layers of sealing ring, waterproof and dustproof effect protrude.
As shown in fig. 6, described side box is provided with line outlet, described side concave surface is located at the bottom of casing, side concave surface with Rainwater is easily gathered when side box is located at side, and the rainwater following current on rain cover has been descended and can also accumulated on the box of side, just in case side The sealing effectiveness of box, which goes wrong, easily causes box house moist, and this problem can be avoided by being arranged on tank floor, rain Water, because self gravitation reason down drops, will not be penetrated into the box of side, it is preferred that described case along meeting after running down into tank floor Body bottom surface is inner sunken face 17, and after setting inner sunken face, and the height of inner sunken face is higher than tank floor, it is smooth under rainwater not It can slide on inner sunken face, will not more penetrate on inner concave.
As shown in fig. 7, the acquisition method flow of this programme is as follows:
1:Combined with three single-phase circuit signal input ports by CT draw-out power supplies, directly obtained on three unilines Current signal, and this signal is transferred to the internal control circuit in acquisition terminal, carry out zero-sequence current detection and judge;Adopt simultaneously What the smart circuit fault detector that the short-distance wireless receiving unit in collection terminal is also received on each uniline was sent Fault-signal, and this signal is also transmitted to the internal control circuit in acquisition terminal, carry out first half-wave method detection and judge;
2:Two kinds of signals are carried out analysis judgement by internal control circuit, and when simultaneously, two kinds of signals of judgement are fault-signal When, this signal is transferred to GPRS wireless launchers;
3:GPRS wireless launchers by signal by long distance wireless network transmissions to master station, and by the final expatriate personnel of master station Investigated or investigated on the spot online.
Only just the present invention preferably example is described above, but is not to be construed as limiting the scope of the invention.This hair Bright not only limitation and above example, its concrete structure allow to change, and those skilled in the art can make respectively according to the present invention Kind changes and deformation, without departing from the spirit of the present invention, all should belong to scope defined in appended claims of the present invention.

Claims (5)

1. a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal, including casing (1) and be connected with casing Chamber door (2), it is characterised in that:Described cabinet exterior is provided with side concave surface (11), and three monophase currents are provided with the concave surface of side and are believed Number input port (31) and a short-distance wireless receiving unit (32) for being used to receive single-phase fault indicator signal, three single-phase Current signal input mouth is all connected to CT draw-out power supplies, is sealed on the concave surface of side and is fixed with side box (3), and the top of casing is provided with top Concave surface (12), push up and GPRS wireless signal transmitters (41) are provided with concave surface, push up sealing on concave surface and be fixed with skylight box (4), it is described Monophase current signal input port be aviation socket, pass through double containment between described casing and side box, skylight box, chamber door Bar sealing structure is sealed, and described casing lateral wall is provided with heat emission hole (13), and described heat emission hole outer wall is provided with rain cover (14), described heat emission hole is oblique, and outside open height is less than inner side open height, and side port is provided with neck in described heat emission hole (15) anti-dust filter mesh (16), is provided with neck, the power subsystem of described CT draw-out power supplies is photovoltaic cell or electric current sense Answer power supply.
2. a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal according to claim 1, it is special Sign is:The annular sealing strip (61) that described dual-seal bar sealing structure is parallel including two on casing and sets, institute Side box, skylight box, the chamber door stated are provided with a single sealing ring (62) being embedded between two annular sealing strips.
3. a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal according to claim 2, it is special Sign is:Two described annular sealing strips are respectively arranged on side concave sidewalls, top concave sidewalls, in casing front openings side wall.
4. a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal according to claim 1, it is special Sign is:Described side box is provided with line outlet, and described side concave surface is located at the bottom of casing.
5. a kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal according to claim 4, it is special Sign is:Described tank floor is inner sunken face (17), and described side concave surface is on inner sunken face.
CN201410708231.8A 2014-11-28 2014-11-28 A kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal and acquisition method Active CN104391226B (en)

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CN112462200A (en) * 2020-12-02 2021-03-09 国网山东省电力公司淄博供电公司 Method for judging ground fault of three-phase single-core power distribution network loop
CN113594962A (en) * 2021-07-20 2021-11-02 李建华 Intelligent identification method for high-altitude dangerous high-voltage line fault in mountainous area
CN113295971A (en) * 2021-07-28 2021-08-24 广东电网有限责任公司湛江供电局 Distribution lines state monitoring indicating device

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