CN103197133A - Large earth screen shunt vector quantity measurement method based on wireless transmission - Google Patents
Large earth screen shunt vector quantity measurement method based on wireless transmission Download PDFInfo
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Abstract
The invention discloses a large earth screen shunt vector quantity measurement method based on wireless transmission, and relates to the technical field of grounding character measurement of large grounding grid of substations, electric power plants, and the like. When grounding impedance measurement of running power station and substation grounding grids is carried out, the wireless transmission technique is adopted, wireless transmission phase information is tested between current injection points and outgoing line frameworks and between the current injection points and outgoing line cable shunt measuring points, a phase between each shunt vector quantity and each test current vector quantity is obtained in real time, a pilot frequency shunted vector quantity flowing through metal frameworks and outgoing line cable outer sheaths is obtained through mathematical treatment, the metal frameworks and the outgoing line cable outer sheaths are connected with outgoing line overhead ground wires, and the pilot frequency shunted vector quantity comprises the size of a module value and a phase difference. The measurement method solves the problem that a shunt vector quantity cannot be measured on site in the past, and provides technical support for refined calculation of shunt coefficients of the running substation overhead ground wires and the cable outer sheaths.
Description
Technical field
The present invention relates to the measuring method of grounded screen in the power industry, specifically refer to a kind of large-scale earth mat shunting vector measurement method based on wireless transmission.
Background technology
Generating plant, grounding net of transformer substation are except providing common reference ground for various electrical equipments, more importantly, play the fault current of fast and effeciently releasing in system's generation earth fault or when being struck by lightning, improving grounded screen and the face of land, place earth potential distributes, ensureing the effect of first and second equipment and personal security, is the important measures of safeguarding power system security reliability service, support personnel and device security.
Impedance ground is the important parameter that characterizes the earth mat performance.Impedance ground is defined as, and earth mat is injected measuring current Im, records the corresponding current potential lifting of earth mat U, impedance ground Z=U/Im with voltage table then.As seen, all test results of grounded screen all are based upon on this basic data of measuring current Im of injecting earth mat.The real current value that accurately obtains injecting current earth mat is extremely important, directly influences test result.
After power plant and transformer station put into operation, the access of aerial earth wire and crosslinked cable screen layer had changed the topological structure of former grounded screen inevitably, and measuring current has been produced bigger shunting action.The measuring current that is instrument output is not all injected current earth mat, but has been diverted to a distant place by aerial earth wire.Shunt influence how accurately to get rid of transformer station's aerial earth wire and cable records the true impedance ground of substation ground network, becomes a difficult problem and the challenge of perplexing engineering technical personnel for a long time.
When the grounded screen impedance ground is measured, conductor in grounded screen injects a power current or non-power-frequency current, electric current will form the loop between grounded screen and the electric current utmost point, obtain a grounded screen Potential distribution of big ground surface on every side, if grounded screen is independently, be that grounded screen and other metallic earthing body do not have and be electrically connected, then measuring current is all loose by grounded screen to be measured and is flow in the earth, and this moment, measurement result reflected the true impedance ground of grounded screen.And if grounded screen and the existence of other metal grounding body are electrically connected, the partial test electric current will flow out by other metal grounding body, and namely other grounding body is shunted measuring current, and stream has been made contribution to loosing, the measuring current that flows through from grounded screen reduces, and causes the impedance ground measurement result less than normal.
The substation ground network area is bigger, underground grounding body becomes the latticed layout of burying underground, ground metal frame links to each other with extraneous aerial earth wire, numerous metal frames link to each other by framework each other simultaneously, earth mat, metal frame, aerial earth wire, cable jacket are connected to each other together, constituted a resistance inductance network jointly, the shunting of alternating-current measurement electric current on each Base Metal framework of injecting earth mat is not reverse completely, but has certain phase difference.For some large-scale transformer stations, also exist circulation between the metal frame framework.
Because what when test injected earth mat is an alternating current, its direction of current with the sine wave period of about 50 of per seconds in real-time change.Measure the vector of metal frame shunting, at first want to compare in real time the metal frame shunting with respect to the phase differential of measuring current.When substation ground network is measured in the past, because the restriction of technical merit and testing apparatus, under a lot of situations or not geodesic line shunting fully, or only survey the mould value size of metal frame shunting, and its phase place of accident.The influence that aerial earth wire looses and flows is not then considered in the accident shunting, and the calculated value of final test electric current is bigger than normal; Survey shunting size (mould value) and the accident phase differential, then all shuntings all can only regard the stream that looses beyond the earth mat, and its direction and complete anti-phase calculating of the measuring current of injecting earth mat, then the calculated value of final test electric current is less than normal; Sometimes the measured divergent die value addition of each metal frame even surpassed the measuring current of injecting can't obtain logical test result.Only accurately measure the vector of shunting everywhere, then measuring current and each shunting are asked vector sum, just can obtain injecting the accurate electric current of earth mat.
Summary of the invention
The purpose of this invention is to provide a kind of large-scale earth mat shunting vector measurement method based on wireless transmission, this measuring method is scientific and reasonable, the branch flow vector that can in-site measurement goes out large-scale earth mat is for the diverting coefficient of accurate Calculation operation transformer station's aerial earth wire and cable jacket provides technical guarantee.
This purpose of the present invention realizes by following technical solution: a kind of large-scale earth mat shunting vector measurement method based on wireless transmission, this method comprises the steps:
(1) injects an alien frequencies measuring current in arbitrary position of large-scale earth mat to be measured, and in test process, keep constant, this alien frequencies measuring current phase place is defined as with reference to zero phase;
(2) utilize the current transformer sampling to obtain the waveform of this alien frequencies measuring current, waveform to this alien frequencies measuring current carries out carrying out operational analysis again after frequency-selective filtering is handled, extract the real-time phase data of waveform, this phase data is sent by wireless launcher;
(3) phase data that adopts radio receiver receiving step (2) to send, and the phase data that will receive is sent into the frequency-selecting multimeter;
(4) the frequency-selecting multimeter connects Luo-coil by interface, when injecting the alien frequencies measuring current with step (1), adopt the Luo-coil circle to live this large-scale ground web area interior a certain metal frame or a certain cable, obtain a certain partial current signal, handle through frequency-selective filtering, send into the frequency-selecting multimeter after getting rid of the undesired signal in this a certain partial current signal, obtain the mould value size of this a certain partial current, the a certain partial current that the frequency-selecting multimeter will obtain carries out the phase bit comparison with the alien frequencies measuring current phase information that step (1) obtains, draw phase differential and the amplitude size of a certain partial current, i.e. the branch flow vector of a certain partial current;
(5) adopt the method identical with step (4), the electric current that calculates each interior metal frame of this large-scale ground web area and each cable jacket one by one divides flow vector, divide flow vector to carry out addition in all electric currents that obtain and ask vector sum, obtain whole large-scale earth mat shunting vector value.
Among the present invention, described large-scale earth mat refers to the large-scale grounding network of transformer station or power plant.
Among the present invention, the alien frequencies measuring current of injecting in the described step (1) refers to the non-power-frequency current of frequency range between 40～70Hz.
Among the present invention, adopt wireless mode to transmit phase information between measuring current decanting point and the partial current measurement point, the wireless transmission coverage is greater than 50 meters.
Among the present invention, the Luo-coil in the described step (4) is that length is greater than the flexible Rogowski coil of 300mm.
Among the present invention, the undesired signal of getting rid of in a certain partial current signal in the described step (4) refers to the undesired signal that frequency is 50Hz.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further details.
Fig. 1 is the schematic diagram of measuring method of the present invention.
Embodiment
Embodiment one
A kind of large-scale grounding network shunting vector measurement method of the transformer station based on wireless transmission, this method comprises the steps:
(1) inject a 53Hz in arbitrary position of large-scale earth mat to be measured, the alien frequencies measuring current of 10A, and in test process, keep constant, this alien frequencies measuring current phase place is defined as with reference to zero phase;
(2) utilize the current transformer sampling to obtain the waveform of this alien frequencies measuring current, the DFWF wireless frequency selecting communication instrument that utilizes Shanghai big sail Electric Appliance Equipment Co., Ltd to produce to this alien frequencies measuring current carries out frequency-selective filtering processing and operational analysis, extract the real-time phase data of waveform, this phase data is sent by wireless launcher;
(3) phase data that adopts radio receiver receiving step (2) to send, and will receive the DF9006 frequency-selecting multimeter that the phase data of coming is sent into the production of Shanghai big sail Electric Appliance Equipment Co., Ltd;
(4) DF9006 frequency-selecting multimeter connects Luo-coil by interface, this Luo-coil is that length is greater than the flexible Rogowski coil of 300mm, when injecting the alien frequencies measuring current with step (1), adopt the Luo-coil circle to live this large-scale ground web area interior a certain metal frame or a certain cable, obtain a certain partial current signal, handle through frequency-selective filtering, the frequency of getting rid of in this partial current signal is the undesired signal of 50Hz, obtain the 53Hz waveform in this partial current, DF9006 frequency-selecting multimeter carries out the phase bit comparison with the partial current waveform that obtains and the 53Hz measuring current phase information that step (3) obtains, draw phase differential and the amplitude size of this partial current, the i.e. branch flow vector of this partial current, wherein adopt wireless mode to transmit phase information between measuring current decanting point and the partial current measurement point, the wireless transmission coverage is greater than 50 meters;
(5) adopt the method identical with step (4), the electric current of all metal frames in large-scale ground of the instrumentation amount web area and each cable jacket divides flow vector one by one, record the partial current mould value of each framework footing and cable, and and the 53Hz measuring current between phase angle difference;
(6) with the alien frequencies measuring current as with reference to 0 ° of vectorial I ∠, calculate the shunting vector sum of the partial current vector of all framework footings and cable,
I2 ∠ θ 2: on-the-spot measured branch flow vector 2; In ∠ θ n: on-the-spot measured shunting vector n;
Vector with the alien frequencies measuring current deducts the shunting vector sum then, namely obtains the actual current value I that large-scale grounding network looses and flows
Earth mat,
I
Earth mat∠ θ: the fixed current vector value of actual injection; 0 ° of I ∠: the measuring current of injection, its phase angle position 0;
I ∑ ∠ θ ∑: the shunting vector sum that each framework is total;
Can also obtain simultaneously aerial earth wire and cable jacket to the diverting coefficient of measuring current
η=(I
Earth mat/ I) * 100%
As the conversion of present embodiment, the alien frequencies measuring current of injecting in the described step (1) can the non-power-frequency current of selecting frequency scope between 40～70Hz.
The measuring method of present embodiment also can be applied to the large-scale grounding network such as power plant etc., and measuring method is identical.
As shown in Figure 1, when doing the impedance ground measurement, according to the method for regulation among the DL/T475-2006 " the earthing device characterisitic parameter is measured guide rule ", with a frequency variation signal source, earth mat is injected a non-power-frequency current Im, and in measurement whole process, keep this current stabilization.Utilize the measuring current sampling of current transformer to injecting, through AD conversion and frequency-selective filtering calculation process, obtain waveform and the phase information of measuring current, this phase place is defined as reference phase, i.e. zero phase.
This reference phase information wireless is launched, and far-end frequency-selecting multimeter is built-in with radio receiver, but wireless receiving and is sent into the CPU of frequency-selecting multimeter to this phase data after will these data handling.
Another port spreading degree of the multimeter of frequency-selecting simultaneously is the above Luo-coil (flexible current mutual inductor) of 300mm, the metal frame that circle firmly links to each other with aerial earth wire, and sampling obtains the partial current signal on the metal frame; Through AD conversion and frequency-selective filtering calculation process, get rid of 50Hz and other interference, extract the shape information of non-power-frequency current, also send into CPU.The CPU computing compare and partial current phase place and wireless receiving to the measuring current phase place compare, then can obtain size and the phase differential of this Base Metal framework shunting, can obtain the vector that this Base Metal framework is shunted.
According to said method, measure in the transformer station all with metal frame that aerial earth wire links to each other on shunting, and the shunting on the crosslinked cable oversheath obtains the vector of respectively shunting.The vector of all shuntings is carried out plural addition ask vector sum, then can obtain whole ground wire branch flow valuve.
During said method is implemented, the technological difficulties of several keys are arranged: how (1) extracts faint shunting signal under strong jamming.Consider that framework footing, iron tower column foot and high-tension cable oversheath size are bigger, the applicant develops specially and had both satisfied dimensional requirement, guarantee the flexible Rogowski coil of enough accuracy again, be called for short Luo-coil, solved the measuring shunt problem in the actual measurement of earth mat impedance ground.(2) filtering and the frequency-selective filtering processing of the current signal of the surveying interference of on-the-spot institute.Developed corresponding anti-interference frequency-selective filtering disposal system at present, can handle the measured feeble signal in scene.(3) the communication transmission of phase information.Because transformer station's area is bigger, and need in the scope of place, hold the traverse measurement everywhere of frequency-selecting multimeter when dividing current test, need design a covering device phase information is passed to the frequency-selecting multimeter that far-end moves accurately and reliably.
The above embodiment of the present invention is not the restriction to protection domain of the present invention; embodiments of the present invention are not limited thereto; according to foregoing of the present invention; ordinary skill knowledge and customary means according to this area; do not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite; modification, replacement or the change of other various ways that said structure of the present invention is made all drop within protection scope of the present invention.
Claims (6)
1. the large-scale earth mat based on wireless transmission is shunted the vector measurement method, and this method comprises the steps:
(1) injects an alien frequencies measuring current in arbitrary position of large-scale earth mat to be measured, and in test process, keep constant, this alien frequencies measuring current phase place is defined as with reference to zero phase;
(2) utilize the current transformer sampling to obtain the waveform of this alien frequencies measuring current, waveform to this alien frequencies measuring current carries out carrying out operational analysis again after frequency-selective filtering is handled, extract the real-time phase data of waveform, this phase data is sent by wireless launcher;
(3) phase data that adopts radio receiver receiving step (2) to send, and the phase data that will receive is sent into the frequency-selecting multimeter;
(4) the frequency-selecting multimeter connects Luo-coil by interface, when injecting the alien frequencies measuring current with step (1), adopt the Luo-coil circle to live this large-scale ground web area interior a certain metal frame or a certain cable, obtain a certain partial current signal, handle through frequency-selective filtering, send into the frequency-selecting multimeter after getting rid of the undesired signal in this a certain partial current signal, obtain the mould value size of this a certain partial current, the a certain partial current that the frequency-selecting multimeter will obtain carries out the phase bit comparison with the alien frequencies measuring current phase information that step (1) obtains, draw phase differential and the amplitude size of a certain partial current, i.e. the branch flow vector of a certain partial current;
(5) adopt the method identical with step (4), the electric current that calculates each interior metal frame of this large-scale ground web area and each cable jacket one by one divides flow vector, divide flow vector to carry out addition in all electric currents that obtain and ask vector sum, obtain whole large-scale earth mat shunting vector value.
2. the large-scale earth mat based on wireless transmission according to claim 1 is shunted the vector measurement method, and it is characterized in that: described large-scale earth mat refers to the large-scale grounding network of transformer station or power plant.
3. the large-scale earth mat based on wireless transmission according to claim 1 is shunted the vector measurement method, and it is characterized in that: the alien frequencies measuring current of injecting in the described step (1) refers to the non-power-frequency current of frequency range between 40～70Hz.
4. the large-scale earth mat based on wireless transmission according to claim 1 is shunted the vector measurement method, it is characterized in that: adopt wireless mode to transmit phase information between measuring current decanting point and the partial current measurement point, the wireless transmission coverage is greater than 50 meters.
5. the large-scale earth mat based on wireless transmission according to claim 1 is shunted the vector measurement method, and it is characterized in that: the Luo-coil in the described step (4) is that length is greater than the flexible Rogowski coil of 300mm.
6. the large-scale earth mat based on wireless transmission according to claim 1 is shunted the vector measurement method, and it is characterized in that: the undesired signal of getting rid of in a certain partial current signal in the described step (4) refers to the undesired signal that frequency is 50Hz.
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| CN103616582A (en) * | 2013-11-13 | 2014-03-05 | 广东电网公司电力科学研究院 | Multidimensional evaluation method for large-scale grounding grid |
| CN103823101A (en) * | 2014-03-14 | 2014-05-28 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for measuring impact current division coefficient of power transmission line tower with lightning conductor |
| CN104122452A (en) * | 2014-07-30 | 2014-10-29 | 武汉大学 | Large grounded screen power-frequency grounding impedance measurement method based on multiple-synchronous different-frequency method |
| CN104569671A (en) * | 2014-12-30 | 2015-04-29 | 云南电网公司电力科学研究院 | Method for testing direct current shunting coefficient of grounding grid of convertor station |
| CN105388355A (en) * | 2015-12-03 | 2016-03-09 | 国家电网公司 | Ground screen shunting vector test system and method with GPS synchronization |
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| CN103823101B (en) * | 2014-03-14 | 2016-04-20 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of electric power line pole tower of measuring tape lightning conducter impacts the method for diverting coefficient |
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| CN104569671A (en) * | 2014-12-30 | 2015-04-29 | 云南电网公司电力科学研究院 | Method for testing direct current shunting coefficient of grounding grid of convertor station |
| CN104569671B (en) * | 2014-12-30 | 2017-08-11 | 云南电网公司电力科学研究院 | A kind of current conversion station grounded screen direct current diverting coefficient method of testing |
| CN105388355A (en) * | 2015-12-03 | 2016-03-09 | 国家电网公司 | Ground screen shunting vector test system and method with GPS synchronization |
| CN105652139A (en) * | 2015-12-30 | 2016-06-08 | 国家电网公司 | Method for testing conductivity of grounding grid |
| CN106872843B (en) * | 2017-05-03 | 2020-02-11 | 福建优迪电力技术有限公司 | Detection apparatus for transmission tower and earth screen hide switch on |
| CN106872843A (en) * | 2017-05-03 | 2017-06-20 | 福建优迪电力技术有限公司 | A kind of transmission tower and the detection means of the hidden conducting of earth mat |
| CN108646077A (en) * | 2018-05-02 | 2018-10-12 | 中铁第四勘察设计院集团有限公司 | The ground connection parameter acquiring method and device of traction substation |
| CN108646085A (en) * | 2018-05-16 | 2018-10-12 | 武汉大洋义天科技股份有限公司 | A kind of earth mat shunting relating rule system and test method based on mobile network |
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