CN105182157A - Neutral point multi-point grounding detection device based on high-accuracy detection current - Google Patents
Neutral point multi-point grounding detection device based on high-accuracy detection current Download PDFInfo
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Abstract
The invention discloses a neutral point multi-point grounding detection device based on high-accuracy detection current. The neutral point multi-point grounding detection device comprises an analyzer, a detector and a clamp meter, wherein a fault analysis module is formed by the analyzer and the clamp meter when in connection, and a fault positioning module is formed by the detector and the clamp meter when in connection. The analyzer adopts a detection current generator designed according to node shunt principle, wherein the detection current generator can achieve high linearity and significantly improve the accuracy of detection. The neutral point multi-point grounding detection device is wide in applicable scenarios and convenient to apply, for example, can be used for judging multi-point grounding of a secondary loop of a current transformer inspected by a transformer substation, and effectively detects whether multi-point grounding of the secondary loop of the current transformer occurs on the premise of ensuring that normal operation of a protective device is not affected.
Description
Technical field
The invention discloses the neutral point multipoint earthing pick-up unit based on high precision test electric current, relate to power automation detection technique field.
Background technology
In technical field of electric power; usually will produce, convert, carry, distribute the equipment (as generator, transformer and the power transmission and distribution line of force etc.) of electric energy; and use the equipment (as motor, electric furnace, relay protection and control device etc.) of electric energy, and even the same entirety of energy management system composition is called electric system.The composition of electric system can be divided into primary system (or primary circuit) and electrical secondary system (or secondary circuit) according to function difference: the former undertakes electric energy conveying and allocating task; the latter is used for monitoring primary system (or primary circuit), controls, measures and the task such as protection; equipment in primary system is called primary equipment, and the equipment in electrical secondary system is called secondary device.
In electric system, common return plays very important effect to safeguards system safe operation.Under system normal operation, in order to ensure the safety of the person and equipment, an electrical connection of " electric operating site safety code " regulation mutual inductor common return must have a reliable earth point.Simultaneously in order to ensure the correct work of relay protection and aut.eq., require loop one point earth.But; electric substation's common return connection device is various; expanded range is wide; usually due to artificial wiring error or some inevitable laws of nature, aging etc. as insulation, appears in the common return of an electrical connection and occurs multipoint earthing; and the common return major part of system is in outdoor; the probability of insulation damages is large, and multipoint earthing causes the incorrect operation protected, and causes large area blackout to occur repeatedly in system.Such as; in order to ensure the normal work of voltage secondary circuit; the neutral conductor network of voltage secondary circuit must keep permanent ground connection; and this earth point can only be had; if there is other earth points except continuous earth point; circuit zero-sequenceprotection malfunction in the other direction, accident such as connection change false protection and pilot protection malfunction etc. will be caused, cause significant impact.
Current substation field checks that the method for multipoint earthing mainly removes former earth point, determines whether there is multipoint earthing phenomenon by measuring circuit resistance to earth.
Be in the patented claim of 201310109898.1 at application number, disclose a kind of voltage secondary circuit neutral conductor network multipoint earthing detection method and system, but adopt conventional detection current injection device in this application, conventional three-phase current generator produces and export examine and determine time required various AC and DC three-phase current waveform time, cannot simultaneously at direct current, power frequency is until interior stability and the accuracy keeping its output current wave of the audiorange of 2kHz, there is working band narrower, when exporting higher hamonic wave, decay comparatively obviously and the high fdrequency component of waveform is easily brought out from shortcomings such as concussions, obviously the requirement of harmonic electric energy meter calibrating has not been met.
Be in the patented claim of 201310565336.8 at application number, disclose a kind of non-contact type current transformer secondary circuit multipoint earthing detection method and system thereof, utilize Faraday's electromagnetic induction law, judging whether have electric current to produce in the neutral line, there is the not high shortcoming of accuracy of detection in this method equally.
Summary of the invention
Technical matters to be solved by this invention is: for the defect of prior art, provides the neutral point multipoint earthing pick-up unit based on high precision test electric current, can at direct current, exchange and normally work to audiorange.Each phase current generator is independently, and be namely mutually isolated on electrically, the electric current of generation is also separate, can receive as required on corresponding current potential, the accurate multipoint earthing problem detected in electric power system.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Based on the neutral point multipoint earthing pick-up unit of high precision test electric current, comprise analyser, detection instrument and split-core type meter, when described analyser is connected with split-core type meter, jointly form failure analysis module, when described detection instrument is connected with split-core type meter, jointly form localization of fault module, wherein
Described analyser comprises the first D/A converter module, signal analyse block, signal control module, detects current feedback circuit and the first display module; Split-core type meter is connected with ground wire with the bus of secondary loop in power system major loop to be measured, the output terminal of split-core type meter accesses signal control module successively after described first analog-to-digital conversion module, signal analyse block, the output terminal of described signal control module is connected with the first display module with detection current feedback circuit respectively, and the output terminal of described detection current feedback circuit accesses the bus of secondary loop in power system major loop to be measured;
Described detection instrument comprises filtration module, the second D/A converter module, signal processing module, fault analysis locating module, audible and visual alarm module and the second display module; Split-core type meter is connected with the ground wire of each branch road of secondary loop in power system to be measured, the output terminal of split-core type meter accesses fault analysis locating module after module, the second D/A converter module, signal processing module successively after filtering, and the output terminal of described fault analysis locating module is connected with the second display module with audible and visual alarm module respectively.
First, second display module described preferably adopts LCDs.
As present invention further optimization scheme, the particular circuit configurations of described detection current feedback circuit comprises the first to the 13 resistance, first to fourth switch, first, second power amplifier, wherein,
The input end of circuit is connected with one end of the first resistance, the second resistance respectively, the other end of the first resistance is connected with the first input end of the first switch, and the other end of the second resistance is connected with the second input end of the first switch, one end of the 3rd resistance, the second input end of second switch, one end of the 4th resistance, the second input end of the 3rd switch, one end of the 5th resistance, the second input end of the 4th switch respectively, the other end of the 3rd resistance is connected with the first input end of second switch, and the other end of the 4th resistance is connected with the first input end of the 3rd switch, and the other end of the 5th resistance is connected with the first input end of the 4th switch, first output terminal of first to fourth switch connects first to fourth CPU pin respectively, and the second output terminal of first to fourth switch is connected with one end of the tenth resistance, one end of the 11 resistance, one end of the 12 resistance, one end of the 13 resistance respectively, the other end of the tenth resistance respectively with the other end of the 11 resistance, the other end of the 12 resistance, the other end of the 13 resistance, one end of 9th resistance, the positive input terminal of the first amplifier is connected, the other end of the 9th resistance is connected with the negative input end of the first amplifier and ground connection, the output terminal of the first amplifier is connected with one end of the 6th resistance, the other end of the 6th resistance respectively with one end of the 8th resistance, the positive input terminal of the second amplifier is connected, the negative input end of the second amplifier is through the 7th resistance eutral grounding, the output terminal of the second amplifier is connected as the output terminal of circuit with the other end of the 8th resistance.
As present invention further optimization scheme, the alternating current that described detection current feedback circuit output frequency is less than 1 hertz.
As present invention further optimization scheme, described detection current feedback circuit also comprises limit value element, and when output current exceedes threshold limit value, limit value element controls to detect current feedback circuit using the threshold limit value of setting as output current.
As present invention further optimization scheme, the size of described tenth to the 13 resistance is followed successively by 62 ohm, 120 ohm, 240 ohm, 480 ohm.
As present invention further optimization scheme, the input voltage of described detection current feedback circuit is 5V.
As present invention further optimization scheme, described second resistance is adjustable resistance.
As present invention further optimization scheme, described split-core type meter is high-precision current split-core type meter.
The invention also discloses a kind of detection method of the neutral point multipoint earthing pick-up unit based on high precision test electric current, concrete steps comprise:
Step one, detection current feedback circuit inject the first electric current to the bus of secondary loop in power system major loop to be measured, and split-core type meter goes out detection by the ground wire of secondary loop in power system major loop to be measured and obtains the second electric current;
Step 2, the difference of described second electric current and described first electric current and pre-set threshold value to be compared, if described difference is in pre-set threshold value, then determine to there is multipoint earthing in secondary loop in power system to be measured;
Step 3, split-core type meter are detected by the ground wire of each branch road of secondary loop in power system to be measured and obtain grounding electric current, according to the size of grounding electric current and the first current differential, determine the particular location of earth point during multipoint earthing.
As present invention further optimization scheme, in described step 3, locate each earth point according to the topological structure of secondary circuit neutral conductor network.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1., by ground loop size of current, can judge whether secondary common return neutral point exists multipoint earth faults, simple and convenient, judge that speed is fast.
2. can the concrete size of display electric current, secondary common return electric current and other loop currents and waveform.
3. direction Presentation Function, when detection instrument detects that system can show the search direction of earth fault when there is multipoint earthing.
4. marking current size can regulate, different according to field condition, do different marking current and select, facilitate the location of trouble spot, and sensed current signal produces based on node shunting principle, more accurately, has concurrently and realizes high-precision reometer function.
Accompanying drawing explanation
Fig. 1 is system architecture model calling schematic diagram of the present invention;
Fig. 2 is in the present invention, detects the electrical structure connection diagram of current feedback circuit; .
Fig. 3 is the principle of work schematic diagram of judgement system multipoint earthing;
Fig. 4 is in specific embodiment, voltage secondary circuit neutral conductor network multipoint earthing testing circuit schematic diagram;
Wherein, R1 to R13 is respectively the first to the 13 resistance, and P1.0 to P1.3 is respectively first to fourth CPU pin, A1 and A2 is respectively first, second power amplifier.
Embodiment
Be described below in detail embodiments of the present invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
In one particular embodiment of the present invention, for voltage secondary circuit neutral conductor network multipoint earthing, testing circuit schematic diagram as shown in Figure 4: the figure shows multipoint earthing detect schematic diagram.A, B, C, D are several places contact in a branch road of neutral conductor network in the figure, and r1, r2, r3 are respectively the resistance of three section leads in branch road, and D is continuous earth point, and r is at the second earth point stake resistance.Under normal circumstances, each neutral line of transformer substation voltage secondary loop forms a network interconnected, at pulpit one point earth.When having in neutral conductor network and only have an earth point, from any point of this neutral framework over the ground between Injection Current, according to Kirchhoff's current law (KCL), the electric current flowing into continuous earth point should be identical with the current value injected, if there are differences, then in the middle of illustrating, somewhere has parasitic ground point (other earth points namely except continuous earth point) to cause shunting.Based on such principle, the Injection Current distribution situation of neutral return path of being correlated with according to neutral conductor network structure detection, can find out parasitic ground point.
Such as: A point over the ground (earth point) injects small electric current I, under normal circumstances (single-point grounding) flow through earth lead AB section, the electric current of BC section and CD section is equal, be all inject electric current I.But the earth point C existed in branch road except continuous earth point D.In this case, the stake resistance r existed between C and ground will play shunting action, thus make the electric current flowing through earth lead CD section must be less than the electric current I of injection.Therefore, flow through AB as long as detect, the electric current of BC, CD section also compares with the electric current injected, and can find impermanent earth point.
System architecture model calling schematic diagram of the present invention as shown in Figure 1, the described neutral point multipoint earthing pick-up unit based on high precision test electric current, comprise analyser, detection instrument and split-core type meter, described analyser forms failure analysis module when being connected with split-core type meter jointly, jointly form localization of fault module when described detection instrument is connected with split-core type meter, described analyser comprises the first D/A converter module, signal analyse block, signal control module, detects current feedback circuit and the first display module; Split-core type meter is connected with ground wire with the bus of secondary loop in power system major loop to be measured, the output terminal of split-core type meter accesses signal control module successively after described first analog-to-digital conversion module, signal analyse block, the output terminal of described signal control module is connected with the first display module with detection current feedback circuit respectively, and the output terminal of described detection current feedback circuit accesses the bus of secondary loop in power system major loop to be measured; Described detection instrument comprises filtration module, the second D/A converter module, signal processing module, fault analysis locating module, audible and visual alarm module and the second display module; Split-core type meter is connected with the ground wire of each branch road of secondary loop in power system to be measured, the output terminal of split-core type meter accesses fault analysis locating module after module, the second D/A converter module, signal processing module successively after filtering, and the output terminal of described fault analysis locating module is connected with the second display module with audible and visual alarm module respectively.
In one particular embodiment of the present invention, analyser adopts civil power AC220V as working power, by the connect into analysis instrument power interface place, one end of power lead, and other end access supply socket; By split-core type meter and signal wire connect into analysis instrument, use the red clip of signal wire to be connected on connecting terminal block, black clip connects earth point, and the split-core type meter pincers accessed by analyser are on common return and signal wire.Confirm that all wire rods connect correct, open analyser power switch, analyser can apply the low current signal of applicable systems axiol-ogy.By different ground connection degree self-adaptation output signal, analyser can calculate signal data automatically, when common return has and only has an earth point, LCDs display size of current, common return size of current, other loop partial current sizes, earthing mode are single-point or multipoint earthing.
Detection instrument adopts 4 joints No. 5 powered battery, if when detected system exists multipoint earth faults, then select detection instrument to carry out earth fault point location.When using detection instrument, first taken off from analyser by split-core type meter, Access Probe instrument, note plug docking, guard against dislocation, keep analytic signal pattern constant, power supply is in open state; 4 joints No. 5 batteries are loaded in detection instrument battery case, confirms that all operations is correct, open detection instrument power switch; Detection instrument power light is bright, is clamped by split-core type meter into by geodesic line, presses " test " key again and carry out earthing detection after pressing " multipoint earthing " function.
In the present invention, detect the electrical structure connection diagram of current feedback circuit as shown in Figure 2, the particular circuit configurations of described detection current feedback circuit comprises the first to the 13 resistance, first to fourth switch, first, second power amplifier, the input end of circuit is connected with one end of the first resistance, the second resistance respectively, the other end of the first resistance is connected with the first input end of the first switch, and the other end of the second resistance is connected with the second input end of the first switch, one end of the 3rd resistance, the second input end of second switch, one end of the 4th resistance, the second input end of the 3rd switch, one end of the 5th resistance, the second input end of the 4th switch respectively, the other end of the 3rd resistance is connected with the first input end of second switch, and the other end of the 4th resistance is connected with the first input end of the 3rd switch, and the other end of the 5th resistance is connected with the first input end of the 4th switch, first output terminal of first to fourth switch connects first to fourth CPU pin respectively, and the second output terminal of first to fourth switch is connected with one end of the tenth resistance, one end of the 11 resistance, one end of the 12 resistance, one end of the 13 resistance respectively, the other end of the tenth resistance respectively with the other end of the 11 resistance, the other end of the 12 resistance, the other end of the 13 resistance, one end of 9th resistance, the positive input terminal of the first amplifier is connected, the other end of the 9th resistance is connected with the negative input end of the first amplifier and ground connection, the output terminal of the first amplifier is connected with one end of the 6th resistance, the other end of the 6th resistance respectively with one end of the 8th resistance, the positive input terminal of the second amplifier is connected, the negative input end of the second amplifier is through the 7th resistance eutral grounding, the output terminal of the second amplifier is connected as the output terminal of circuit with the other end of the 8th resistance.
P1.0, P1.1, P1.2, P1.3 are that CPU controls pin, and switch 1,2,3,4 is gauge tap, exports control signal, gauge tap state by CPU pin.
According to node shunting principle, a certain switch is in open mode, 5v DC voltage will produce pressure drop at corresponding output resistance (62 Ω, 120 Ω, 240 Ω, 480 Ω), by Ohm law, can obtain corresponding output current (10mA, 20mA, 40mA, 80mA).When needing the marking current producing 150mA to be, corresponding gauge tap is only needed to be in open state just passable.
The principle of work schematic diagram of judgement system multipoint earthing as shown in Figure 3, device analysis instrument can apply a low-frequency d current signal to tested common return system, during single-point grounding, this current signal can only flow through from N600 ground wire, this size of current and applying signal source equal and opposite in direction; And during multipoint earth faults, this signal source electric current, except flowing through at N600 ground wire, also can flow through from other ground wire, therefore by can realize multipoint earthing whether judgement to the contrast of known signal source and N600 ground wire test signal size.
As shown in Figure 3, when system be single electrical ground time, C and D is in off-state, I1=I2, and electric current electric current that split-core type meter is surveyed is 0; When system exists multipoint earthing, multipoint earthing point occurs in C and D place, then I1=I2+I3, electric current measured by electric current split-core type meter is I1-I2=I3, and this curent change frequency is consistent with marking current frequency, can judge that system exists multipoint earthing according to this characteristic.
When after system generation multipoint earth faults, detection instrument can be used to detect one by one other ground wire, for the branch road that multipoint earth faults does not occur, can't detect marking current, as the branch road 1 in figure and branch road 2; And for there is the branch road of multipoint earth faults, detection instrument detects marking current I3, as the branch road n in figure, by being grounded the location of trouble spot to this amperometry.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to technical spirit of the present invention, within the spirit and principles in the present invention, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection domain all still belonging to technical solution of the present invention.
Claims (10)
1. based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: comprise analyser, detection instrument and split-core type meter, when described analyser is connected with split-core type meter, jointly form failure analysis module, when described detection instrument is connected with split-core type meter, jointly form localization of fault module, wherein
Described analyser comprises the first D/A converter module, signal analyse block, signal control module, detects current feedback circuit and the first display module; Split-core type meter is connected with ground wire with the bus of secondary loop in power system major loop to be measured, the output terminal of split-core type meter accesses signal control module successively after described first analog-to-digital conversion module, signal analyse block, the output terminal of described signal control module is connected with the first display module with detection current feedback circuit respectively, and the output terminal of described detection current feedback circuit accesses the bus of secondary loop in power system major loop to be measured;
Described detection instrument comprises filtration module, the second D/A converter module, signal processing module, fault analysis locating module, audible and visual alarm module and the second display module; Split-core type meter is connected with the ground wire of each branch road of secondary loop in power system to be measured, the output terminal of split-core type meter accesses fault analysis locating module after module, the second D/A converter module, signal processing module successively after filtering, and the output terminal of described fault analysis locating module is connected with the second display module with audible and visual alarm module respectively.
2. as claimed in claim 1 based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: the particular circuit configurations of described detection current feedback circuit comprises the first to the 13 resistance, first to fourth switch, first, second power amplifier, wherein
The input end of circuit is connected with one end of the first resistance, the second resistance respectively, the other end of the first resistance is connected with the first input end of the first switch, and the other end of the second resistance is connected with the second input end of the first switch, one end of the 3rd resistance, the second input end of second switch, one end of the 4th resistance, the second input end of the 3rd switch, one end of the 5th resistance, the second input end of the 4th switch respectively, the other end of the 3rd resistance is connected with the first input end of second switch, and the other end of the 4th resistance is connected with the first input end of the 3rd switch, and the other end of the 5th resistance is connected with the first input end of the 4th switch, first output terminal of first to fourth switch connects first to fourth CPU pin respectively, and the second output terminal of first to fourth switch is connected with one end of the tenth resistance, one end of the 11 resistance, one end of the 12 resistance, one end of the 13 resistance respectively, the other end of the tenth resistance respectively with the other end of the 11 resistance, the other end of the 12 resistance, the other end of the 13 resistance, one end of 9th resistance, the positive input terminal of the first amplifier is connected, the other end of the 9th resistance is connected with the negative input end of the first amplifier and ground connection, the output terminal of the first amplifier is connected with one end of the 6th resistance, the other end of the 6th resistance respectively with one end of the 8th resistance, the positive input terminal of the second amplifier is connected, the negative input end of the second amplifier is through the 7th resistance eutral grounding, the output terminal of the second amplifier is connected as the output terminal of circuit with the other end of the 8th resistance.
3., as claimed in claim 1 or 2 based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: the alternating current that described detection current feedback circuit output frequency is less than 1 hertz.
4. as claimed in claim 1 or 2 based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: described detection current feedback circuit also comprises limit value element, when output current exceedes threshold limit value, limit value element controls to detect current feedback circuit using the threshold limit value of setting as output current.
5., as claimed in claim 2 based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: the size of described tenth to the 13 resistance is followed successively by 62 ohm, 120 ohm, 240 ohm, 480 ohm.
6., as claimed in claim 2 based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: the input voltage of described detection current feedback circuit is 5V.
7., as claimed in claim 2 based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: described second resistance is adjustable resistance.
8., as claimed in claim 1 or 2 based on the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that: described split-core type meter is high-precision current split-core type meter.
9., based on a detection method for the neutral point multipoint earthing pick-up unit of high precision test electric current, it is characterized in that, concrete steps comprise:
Step one, detection current feedback circuit inject the first electric current to the bus of secondary loop in power system major loop to be measured, and split-core type meter goes out detection by the ground wire of secondary loop in power system major loop to be measured and obtains the second electric current;
Step 2, the difference of described second electric current and described first electric current and pre-set threshold value to be compared, if described difference is in pre-set threshold value, then determine to there is multipoint earthing in secondary loop in power system to be measured;
Step 3, split-core type meter are detected by the ground wire of each branch road of secondary loop in power system to be measured and obtain grounding electric current, according to the size of grounding electric current and the first current differential, determine the particular location of earth point during multipoint earthing.
10. the detection method of a kind of neutral point multipoint earthing pick-up unit based on high precision test electric current as claimed in claim 8, is characterized in that: in described step 3, locates each earth point according to the topological structure of secondary circuit neutral conductor network.
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| CN105699845B (en) * | 2016-02-26 | 2018-09-14 | 方刚 | Electrical equipment power cable line is grounded/goes here and there electric fault point and finds instrument |
| CN107957568A (en) * | 2017-11-23 | 2018-04-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Secondary Circuit of Potential Transformer multipoint earthing Quick positioning instrument and lookup method |
| CN109991517A (en) * | 2019-04-16 | 2019-07-09 | 华能山东石岛湾核电有限公司 | For judging the structure and its test method of position of failure point |
| CN109991517B (en) * | 2019-04-16 | 2024-05-03 | 华能山东石岛湾核电有限公司 | Structure for judging fault point position and test method thereof |
| CN114384459A (en) * | 2021-12-09 | 2022-04-22 | 国电南瑞三能电力仪表(南京)有限公司 | Method, system and device for detecting reliability of hard connection |
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