CN104391226A - Distribution line online monitoring collection terminal and collection method supporting three-phase synchronous collection - Google Patents
Distribution line online monitoring collection terminal and collection method supporting three-phase synchronous collection Download PDFInfo
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- CN104391226A CN104391226A CN201410708231.8A CN201410708231A CN104391226A CN 104391226 A CN104391226 A CN 104391226A CN 201410708231 A CN201410708231 A CN 201410708231A CN 104391226 A CN104391226 A CN 104391226A
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Abstract
The invention discloses a distribution line online monitoring collection terminal and a distribution line online monitoring collection method supporting three-phase synchronous collection, the distribution line online monitoring collection terminal including a box and a box door connected to the box, the side surface of the box is provided with a side concave surface in which three single-phase current signal input ports and one short distance wireless receiving unit for receiving signals of a single-phase fault indicator, a side box is hermetically fixed on the side concave surface, a top concave surface is arranged at the top of the box, a GPRS wireless signal transmitter is arranged in the top concave surface, a skylight box is hermetically fixed on the top concave surface, the single phase current signal input port is a aerial socket, and the box and each of the side box, the skylight box and the box door are sealed by a double sealing strip structure; distribution line online monitoring collection terminal and method supporting three-phase synchronous collection has the advantages of being capable of simultaneously collecting single-phase simultaneous current signals and wireless fault signals provided by an intelligent line fault device for analyzing and calculating, and capable of accurately judging the single phase ground fault of a small current grounding system.
Description
Technical field
The present invention relates to a kind of acquisition terminal and acquisition method of on-line monitoring line fault.
Background technology
Distribution line long transmission distance, branch line are many, and how in reticulate texture, its troubleshooting is very difficult.If distribution line on-line monitoring acquisition terminal matches with intelligent line fault detector, like that can the normal operation of Real-Time Monitoring circuit and fault generating process, detect and indicate short circuit and earth fault, if this technology is implemented be distribution line understands circuit in real time operation conditions to operation maintenance personnel, location, maintenance etc. after fault occurs bring great convenience.
And for this technology, the localization of fault of singlephase earth fault of small current neutral grounding system is adopted to be one of difficult point of facing of distribution automation, first, because singlephase earth fault stake resistance is larger, fault-signal is weak, destroys the service condition of a lot of targeting scheme; Secondly, distribution network line branch of China is numerous, affect comparatively large, and each take-off point has the effect of decay and distortion to transient signal, is unfavorable for improving accuracy of detection by load current.
At present, the detection method of the singlephase earth fault of small current neutral grounding system has following a few class usually:
1: signal injection method, program accuracy of detection is high, but needs the topological structure changing transformer station, therefore is not widely adopted;
2: Harmonic detection: utilize magnetic saturation when imbalance of three-phase voltage of iron core equipment in electrical network and the harmonic component produced, low current grounding is detected.
3: zero-sequence current detection method: by comparing the amplitude size and Orientation of the zero-sequence current before and after singlephase earth fault occurs, judge low current grounding;
4: first half-wave method: when utilizing small current neutral grounding to occur, that transient state that coupling capacitance produces over the ground of electrical network is shaken, and judges low current grounding.
Methods numerous above all has the accuracy of its applicable situation and differentiation, if single determination methods all cannot complete to entirely accurate the task of single-phase grounded malfunction in grounded system of low current route selection.Only on the basis of comprehensive above-mentioned various method, the precision of single-phase earth fault line selection could be improved.And intelligent line fault detector conventional at present just gathers single-phase current usually.The program can meet the requirement that phase fault detects substantially, but for the singlephase earth fault of small current system, can only be judged, seriously limit the accuracy that it judges low current fault by transient signals such as the first half-waves of detection to singlephase earth fault.
Summary of the invention
The technical issues that need to address of the present invention are, there is provided a kind of support three-phase synchronous to gather distribution line on-line monitoring acquisition terminal and acquisition method, the wireless malfunction signal that can gather single-phase instantaneous current signal and intelligent line fault device provides simultaneously carries out analytical calculation, accurately can judge the singlephase earth fault of small current neutral grounding system.
Technical scheme of the present invention is: a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather, the chamber door comprising casing and be connected with casing, described body side is provided with side concave surface, three single-phase current signal input ports and one is provided with for receiving the short-distance wireless receiving element of single-phase fault indicator signal in the concave surface of side, on the concave surface of side, sealing is fixed with side box, the top of casing is provided with top concave surface, GPRS wireless signal transmitter is provided with in the concave surface of top, on the concave surface of top, sealing is fixed with skylight box, described single-phase current signal input port is aviation socket, described casing and side box, skylight box, all sealed by dual-seal bar hermetically-sealed construction between chamber door.
Preferably, described dual-seal bar structure comprises the parallel and annular sealing strip established of two of being located on casing, and described side box, skylight box, chamber door are provided with a single O-ring seal be embedded between two annular sealing strips.
Preferably, two described annular sealing strips are located on side concave sidewalls, top concave sidewalls, casing front openings sidewall respectively.
Preferably, described casing lateral wall is provided with louvre, and described louvre outer wall is provided with rain cover.
Preferably, described louvre is skewed, and lateral port height is lower than inner side open height.
Preferably, inside described louvre, mouth is provided with draw-in groove, is provided with anti-dust filter mesh in draw-in groove.
Preferably, described side box is provided with line outlet, and described side concave surface is positioned at the bottom of casing.
Preferred volume, described tank floor is inner sunken face, and described side concave surface is located on inner sunken face.
Preferably, the power supply unit of described CT draw-out power supply is photovoltaic cell or current-inducing power supply.
Also provide a kind of distribution line on-line monitoring acquisition method supporting three-phase synchronous to gather in addition, concrete grammar is as follows:
1: be combined with three single-phase circuit signal input ports by CT draw-out power supply, directly obtain the current signal on three unilines, and by this Signal transmissions to the internal control circuit in acquisition terminal, carry out zero-sequence current and detect judgement; Short-distance wireless receiving element simultaneously on acquisition terminal also receives the fault-signal sent from the smart circuit fault detector on each uniline, and this signal is also transferred to the internal control circuit in acquisition terminal, carries out first half-wave method and detects judgement;
2: two kinds of signals are carried out analysis and judge, when judging that two kinds of signals are fault-signal simultaneously, by this Signal transmissions to GPRS wireless launcher by internal control circuit;
Signal is passed through long distance wireless network transmissions to master station by 3:GPRS wireless launcher, and is investigated online by the final expatriate personnel of the system of master station or investigated on the spot.
After adopting the technical program, distribution line on-line monitoring acquisition terminal sends Synchronous Sampling Pulse to each intelligent line fault detector in a broadcast manner by wireless channel, the sampling flow process of each intelligent line fault detector of synchronous averaging, gathering the line current of a cycle, after earth electric field, distribution line on-line monitoring acquisition terminal calls the line current of this cycle successively from each intelligent line fault detector, to earth electric field real time data, the zero-sequence current of three-phase is calculated with this, zero sequence is to earth electric field, zero sequence can reflect residual voltage over the ground to a certain extent to earth electric field, in this programme, zero-sequence current is directly obtained by three single-phase current signal input ports, the signal data that intelligent line fault detector sends then is received by short-distance wireless receiving element, two kinds of data gather simultaneously, in conjunction with after advantage be:
1: in small current neutral grounding system, if there is singlephase earth fault, its residual voltage is inevitable significantly to be raised.Due to zero sequence over the ground electric field energy reflect its residual voltage to a certain extent, therefore this signal also just can as singlephase earth fault judge entry condition.When residual voltage is less, without the need to carrying out a large amount of operation and the work of radio communication.This will reduce the power consumption of distribution line on-line monitoring acquisition terminal significantly, alleviates the pressure to distribution line on-line monitoring acquisition terminal power-supply system.
2: what detect due to first half-wave method is transient signal, the impact be very easily interfered.Distribution line on-line monitoring acquisition terminal just operates in a highfield still more, in strongly disturbing environment.Secondly namely first half-wave method itself has certain judgement blind area, and the prerequisite of the method occurs in phase voltage close to maximal value moment based on singlephase earth fault.Effective acquisition of zero-sequence current, on the one hand can headed by half-wave method evidence is provided, before and after first half-wave judges, if zero-sequence current has had larger fluctuation, singlephase earth fault can have been affirmed further.Also blind area when adopting merely first half-wave method can be reduced on the other hand.
Two kinds of methods gather simultaneously, and have complementary function, can judge uniline fault more accurately,
In addition, make use of water proof type aviation socket and replace original cable hole, isolate thoroughly having carried out inside and outside casing, the sealing rubber ring that the aviation socket of water proof type is built-in also can avoid dust, water is on the impact of box house electronic component, aviation plug, the structure also convenient eliminating of the plug on the spot line fault of the plug and play of aviation socket, casing need not be opened, avoid the damage that may cause device in casing, the good airproof performance of whole casing simultaneously, chamber door, side box, skylight box all adopts dual-seal bar hermetically-sealed construction, strengthen the waterproof of whole casing, dust-proof effect, improve the reliability of equipment.
Accompanying drawing explanation
Accompanying drawing 1 is casing and chamber door schematic diagram when merging;
Accompanying drawing 2 is the schematic diagram of each parts of the present invention;
Accompanying drawing 3 is the schematic diagram inside louvre;
Accompanying drawing 4 is the cross-sectional schematic at louvre place;
Accompanying drawing 5 is the schematic diagram of dual-seal bar hermetically-sealed construction;
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
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
As shown in Figures 1 to 7, a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather, the chamber door 2 comprising casing 1 and be connected with casing, described body side is provided with side concave surface 11, three single-phase current signal input ports 31 and one is provided with for receiving the radio receiving unit 32 of single-phase fault indicator signal in the concave surface of side, three single-phase current signal input ports are all connected to CT draw-out power supply, the power supply unit of described CT draw-out power supply is preferably photovoltaic cell or current-inducing power supply, can by illumination energy supply or electric current induction energy supply, self-sufficient, do not need additionally to increase power supply, single-phase current signal input port is combined the signals such as the real-time current for obtaining each uniline in three-phase line with CT draw-out power supply, judge the phase fault of circuit, the malfunctions such as single-phase earthing, radio receiving unit then obtains the signal of intelligent line fault device by the mode of wireless receiving, the sampling of synchronous each phase intelligent line fault detector, calculate zero-sequence current, zero sequence is to earth electric field, on the concave surface of side, sealing is fixed with side box 3, the top of casing is provided with top concave surface 12, GPRS wireless signal transmitter 41 is provided with in the concave surface of top, be connected with main station system by GPRS wireless public network, and by the real-time current of three-phase line, the phase fault of circuit, to earth electric field, the malfunction timings such as single-phase earthing report main station system, to improve the response speed of fault, improve power supply quality, on the concave surface of top, sealing is fixed with skylight box 4, skylight box is for the protection of GPRS wireless signal transmitter 41, prevent rainwater etc. from penetrating in casing by GPRS wireless signal transmitter 41 simultaneously, described single-phase current signal input port is aviation socket, CT draw-out power supply, short-distance wireless receiving element, GPRS wireless signal transmitter are connected with box house control circuit, what aviation socket mated is aviation plug, aviation socket, plug, also referred to as military project socket, plug, are formerly used for aircraft and gain the name.Be widely used in now the fields such as navigation, space flight, electric power, enclosure material often adopts magnalium, sturdy and durable.And aviation socket, plug with metal shell close, part stops internal electromagnetic radiation or external electromagnetic field to the interference of device, plug and play can be realized, very convenient, in this example, three single-phase current signal input ports are aviation socket, facilitate plug separately to investigate when detecting on the spot, all sealed by dual-seal bar hermetically-sealed construction between described casing and side box, skylight box, chamber door.The advantage of this programme is adopted to be to combine zero-sequence current detection method and first half-wave method, the entry condition that zero-sequence current detection method judges as singlephase earth fault, in the normal situation of circuit, without the need to carrying out a large amount of operation and the work of radio communication, reduce the power consumption of distribution line on-line monitoring acquisition terminal significantly, alleviate the pressure to distribution line on-line monitoring acquisition terminal power-supply system, the prerequisite that first half-wave method detects is based on zero-sequence current detection method, effective acquisition of zero-sequence current, on the one hand can headed by half-wave method evidence is provided, before and after first half-wave judges, if zero-sequence current has had larger fluctuation, singlephase earth fault can be affirmed further, also blind area when adopting merely first half-wave method can be reduced on the other hand, two kinds of methods combining improve the accuracy of malfunction monitoring, and in time fault-signal is transferred to master station by GPRS wireless signal transmitter, the very first time can carry out failture evacuation, simultaneously, this terminal box body adopts waterproof, dust-proof hermetically-sealed construction, can ensure that the internal electronic element of acquisition terminal normally uses not make mistakes, further raising accuracy.
As shown in Figure 3 and Figure 4, described casing lateral wall is provided with louvre 13, described louvre outer wall is provided with rain cover 14, louvre can contribute to electronic element radiating in casing, and after installing rain cover additional, can prevent outside rainwater from entering in casing from louvre, preferably, described louvre is skewed, lateral port height is lower than inner side open height, the advantage of this design is: casing is placed on outdoor, many times some droplets can be assembled by louvre lateral port place, these droplets can because the external force impacts such as wind flow in casing, the electronic component in casing is affected after making moist for a long time, louvre is arranged to skewed, make these droplets before entering casing by external force, first will overcome self gravitation just can enter, reduce casing damp degree, certainly in order to by waterproof, dust-proof effect reaches most desired effect, inside described louvre, mouth is provided with draw-in groove 15, anti-dust filter mesh 16 is provided with in draw-in groove, because unique opening part of whole casing is exactly at louvre place, arrange unique channel that micronic dust can enter casing by anti-dust filter mesh effectively to contain at this place, anti-dust filter mesh generally has absorbing component simultaneously, this part absorbing component can also intercept a part and overcome self gravitation and enter droplet in casing, dust-proof, waterproof is neglected neither.
As shown in Figure 5, for the junction of chamber door and casing, described dual-seal bar hermetically-sealed construction comprises the parallel and annular sealing strip 61 established of two of being located on casing, described side box, skylight box, chamber door is provided with a single O-ring seal 62 be embedded between two annular sealing strips, article two, parallel and annular sealing strip that is that establish is fixed on cabinet wall near opening part, article two, leave space in the middle of annular sealing strip, another sealing strip lower just can be filled in this space, namely the single O-ring seal 62 in this example, after single O-ring seal jam-pack respectively with two annular sealing strip interference fit, outside water will enter in casing, then will by the protection of two-layer O-ring seal, waterproof, dust-proof effect is given prominence to.
As shown in Figure 6, described side box is provided with line outlet, described side concave surface is positioned at the bottom of casing, when side is located at by side concave surface and side box, rainwater easily gathers, and the rainwater following current on rain cover has been descended also to accumulate on the box of side, easily cause box house moist just in case the sealing effectiveness of side box goes wrong, and be arranged on tank floor and can avoid this problem, rainwater down can drop because of self gravitation reason after running down into tank floor, can not penetrate in the box of side, preferably, described tank floor is inner sunken face 17, and after inner sunken face is set, the height of inner sunken face is higher than tank floor, rainwater under smooth can not slide on inner sunken face, more can not penetrate on inner concave.
As shown in Figure 7, the acquisition method flow process of this programme is as follows:
1: be combined with three single-phase circuit signal input ports by CT draw-out power supply, directly obtain the current signal on three unilines, and by this Signal transmissions to the internal control circuit in acquisition terminal, carry out zero-sequence current and detect judgement; Short-distance wireless receiving element simultaneously on acquisition terminal also receives the fault-signal sent from the smart circuit fault detector on each uniline, and this signal is also transferred to the internal control circuit in acquisition terminal, carries out first half-wave method and detects judgement;
2: two kinds of signals are carried out analysis and judge, when judging that two kinds of signals are fault-signal simultaneously, by this Signal transmissions to GPRS wireless launcher by internal control circuit;
Signal is passed through long distance wireless network transmissions to master station by 3:GPRS wireless launcher, and is investigated online by the final expatriate personnel of master station or investigated on the spot.
Below only just the present invention preferably example be described, but can not be interpreted as it is limitations on claims.The present invention not only limits to and above example, and its concrete structure allows to change, and those skilled in the art can make various change and distortion according to the present invention, only otherwise depart from spirit of the present invention, all should belong to the scope that claims of the present invention define.
Claims (10)
1. the distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather, the chamber door (2) comprising casing (1) and be connected with casing, it is characterized in that: described cabinet exterior is provided with side concave surface (11), three single-phase current signal input ports (31) and one is provided with for receiving the short-distance wireless receiving element (32) of single-phase fault indicator signal in the concave surface of side, three single-phase current signal input ports are all connected to CT draw-out power supply, on the concave surface of side, sealing is fixed with side box (3), the top of casing is provided with top concave surface (12), GPRS wireless signal transmitter (41) is provided with in the concave surface of top, on the concave surface of top, sealing is fixed with skylight box (4), described single-phase current signal input port is aviation socket, described casing and side box, skylight box, all sealed by dual-seal bar hermetically-sealed construction between chamber door.
2. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 1, it is characterized in that: described dual-seal bar hermetically-sealed construction comprises the parallel and annular sealing strip (61) established of two of being located on casing, and described side box, skylight box, chamber door are provided with a single O-ring seal (62) be embedded between two annular sealing strips.
3. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 2, is characterized in that: two described annular sealing strips are located on side concave sidewalls, top concave sidewalls, casing front openings sidewall respectively.
4. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 1, it is characterized in that: described casing lateral wall is provided with louvre (13), described louvre outer wall is provided with rain cover (14).
5. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 4, it is characterized in that: described louvre is skewed, lateral port height is lower than inner side open height.
6. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 5, is characterized in that: inside described louvre, mouth is provided with draw-in groove (15), is provided with anti-dust filter mesh (16) in draw-in groove.
7. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 1, it is characterized in that: described side box is provided with line outlet, described side concave surface is positioned at the bottom of casing.
8. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 7, is characterized in that: described tank floor is inner sunken face (17), and described side concave surface is located on inner sunken face.
9. a kind of distribution line on-line monitoring acquisition terminal supporting three-phase synchronous to gather according to claim 1, is characterized in that: the power supply unit of described CT draw-out power supply is photovoltaic cell or current-inducing power supply.
10. the distribution line on-line monitoring acquisition method supporting three-phase synchronous to gather, is characterized in that: concrete grammar is as follows:
1: be combined with three single-phase circuit signal input ports by CT draw-out power supply, directly obtain the current signal on three unilines, and by this Signal transmissions to the internal control circuit in acquisition terminal, carry out zero-sequence current and detect judgement; Short-distance wireless receiving element simultaneously on acquisition terminal also receives the fault-signal sent from the smart circuit fault detector on each uniline, and this signal is also transferred to the internal control circuit in acquisition terminal, carries out first half-wave method and detects judgement;
2: two kinds of signals are carried out analysis and judge, when judging that two kinds of signals are fault-signal simultaneously, by this Signal transmissions to GPRS wireless launcher by internal control circuit;
Signal is passed through long distance wireless network transmissions to master station by 3:GPRS wireless launcher, and is investigated online by the final expatriate personnel of the system of master station or investigated on the spot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410708231.8A CN104391226B (en) | 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 |
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| CN201410708231.8A CN104391226B (en) | 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 |
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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 |
| 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 |
| 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 |
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| CN114252662A (en) * | 2021-12-22 | 2022-03-29 | 东莞市嘉田电子科技有限公司 | Server line fault positioning detection device and detection method |
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