CN111880008B - Comprehensive tester for ground net conduction - Google Patents
Comprehensive tester for ground net conduction Download PDFInfo
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- CN111880008B CN111880008B CN202010791347.8A CN202010791347A CN111880008B CN 111880008 B CN111880008 B CN 111880008B CN 202010791347 A CN202010791347 A CN 202010791347A CN 111880008 B CN111880008 B CN 111880008B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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Abstract
The invention discloses a comprehensive tester for the conduction of a ground network, which belongs to the technical field of ground network conduction tests and comprises an alternating current source, an ammeter, a voltmeter, four test terminals, a pair of current wires and a pair of voltage wires, wherein the four test terminals comprise a test terminal 1, a test terminal 2, a test terminal 3 and a test terminal 4. the invention innovatively avoids the influence of interference by using an interference source as a test source, and enables the interference source to be equivalent to an equivalent circuit of a voltage source U and an internal resistance R0, the purpose that the test is more accurate when the interference is larger in the test is achieved, the adverse influence caused by the interference is effectively avoided, the measurement accuracy of the conduction resistance of the ground network under the interference is improved, the comprehensive evaluation of the state of the regional ground network is realized, the weak link of the ground network is judged, and the accurate monitoring is carried out on a strong interference region, namely an accurate measure is provided, and meanwhile, a targeted and accurate measure for reducing the ground network interference is provided.
Description
Technical Field
The invention relates to the technical field of grounding grid conduction testing, in particular to a grounding grid conduction comprehensive tester.
Background
The reliable and effective connection between the grounding lead of the power equipment and the ground grid is the fundamental guarantee for the safe operation of the power equipment. The grounding lead is a connecting part of the power equipment and the grounding grid, and in the long-time operation process of the power equipment, the connecting part is likely to be affected by factors such as dampness, the phenomena of contact corrosion, even breakage and the like occur, so that the resistance of the connecting point of the grounding lead and the main grounding grid is increased, the requirement of a power regulation cannot be met, the potential safety hazard exists in the operation of the equipment, and the operation of the equipment in a grounding loss mode can be caused in a serious condition. And the electromagnetic interference of partial area is great, if according to conventional setting, can cause primary, secondary equipment to receive the influence of strong interference. The prior art can not effectively distinguish where the earth screen connection is to be strengthened, and where the earth screen connection can be properly weakened, which causes great waste of earth screen investment. The existing grounding grid conduction testing technology has the following defects:
first, the resistance measurement is inaccurate
The underground lead conduction tester is an intelligent instrument for measuring the conduction resistance between the grounding leads of each electric device in a transformer substation. The underground lead conduction tester and the calculation mechanism form an underground lead conduction test system. At present, most underground lead conduction testers are connected with a computer through serial ports to achieve communication, namely, when the underground lead conduction testers are used on site, wiring needs to be conducted between the underground lead conduction testers and tested equipment or devices and between the underground lead conduction testers and the computer, the underground lead conduction testers are complex, particularly when test operation is switched among different tested equipment or devices, the underground lead conduction testers are limited by site operation environments, wiring needs to be disconnected between the underground lead conduction testers and the tested equipment or devices, wiring needs to be disconnected between the underground lead conduction testers and the computer frequently, and the underground lead conduction testers and the computer are very inconvenient.
However, the ground grid is often affected by various types of electromagnetic interference, so that the data measured by the ground grid conduction testing instrument is inaccurate. If some patents adopt different frequency and large current testing methods to reduce interference, some patents also adopt the method to prevent interference according to the phase angle of current and voltage, but when the interference is large, the interference influence can not be avoided. Still mainly rely on measures such as filtering, increase instrument output power to reduce the influence of interference source among the prior art, lead to anti-interference effect not good. The patent hopes to utilize the interference source as one of the test sources, so that the larger the interference source is, the more accurate the test result is.
Second, the method for optimizing the ground net is imperfect
The existing ground screen evaluation generally uses on-resistance, grounding impedance and the like as measuring bases, after a test result is obtained, professional software is used for simulating the ground screen to judge whether the ground screen has defects or not, and the method is not intuitive. In addition, the existing measures generally analyze fault current, and in a part of high-interference areas, when the system operates normally, the interference current is overlarge, so that the earth screen circulating current is overlarge, the secondary cable shielding layer circulating current is overlarge, and events such as burning out the earth screen and burning out the cable shielding layer occur occasionally. And the ground screen aiming at the partial area lacks of special testing tools and optimization methods.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide an earth screen conduction comprehensive tester which innovatively avoids the influence of interference by using an interference source as a test source, the interference source is equivalent to an equivalent circuit of a voltage source U and an internal resistance R0, the aim of more accurate test is achieved when the interference is larger in the test, the adverse influence caused by the interference is effectively avoided, the measurement accuracy of the earth screen conduction resistance under the interference is improved, the comprehensive evaluation of the state of a regional earth screen is realized, the weak link of the earth screen is judged, the accurate monitoring is carried out on a strong interference region, namely, an accurate measure is provided, and meanwhile, the targeted accurate measure for reducing the earth screen interference is provided.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The utility model provides a ground net conduction integrated tester, includes alternating current source, ampere meter, voltmeter, four test terminal, a pair of current-supply line and a pair of voltage line, four test terminal include test terminal 1, test terminal 2, test terminal 3 and test terminal 4, and its test method is:
s1, assuming that the resistance between the two points A/B of the grounding grid needs to be tested, equating an interference source between the two points A/B of the grounding grid into an equivalent circuit of a voltage source U and an internal resistance R0, and then carrying out circuit connection;
s2, connecting an alternating current source between a test terminal 1 and an ammeter, connecting the other binding post of the ammeter with a test terminal 4, connecting a voltmeter between a test terminal 2 and a test terminal 3, then connecting the test terminal 1 and the test terminal 4 with a grounding grid A point through a pair of current lines respectively, and connecting the test terminal 2 and the test terminal 3 with a grounding grid B point through a pair of voltage lines respectively;
s3, monitoring the amplitude and the frequency F0 of the interference voltage U0;
s4, when the interference voltage U0 is larger than the set value UHigh interferenceAnd the duration is greater than the set value UStrong dryInterference deviceEntering a strong interference test flow, and specifically operating as follows:
s4.1, monitoring voltmeter data U in the whole process, and if the voltmeter data U is larger than the set value UInstantaneous interferenceIf the interference is determined to be instantaneous interference, the following process is restarted:
s4.2, firstly, closing the output of the instrument, directly measuring interference current I1, and recording interference voltages U1 and I1;
s4.3, adjusting the output current of the instrument to I2, and testing and recording the voltage U2 at the two ends of the A/B of the ground grid;
s4.4, according to the formulas U1 ═ U0+ I1 ═ R0 and U2 ═ U0+ I2 × R0, the following were determined: r0 ═ (U2-U1)/(I2-I1);
s5, when the interference voltage U0 is less than the set value UHigh interferenceAnd then entering a weak interference test flow, and specifically operating as follows:
s5.1, adjusting the output frequency of the instrument to be 50HZ, adjusting the current to be I1 ', and testing the voltage U1' at the two ends of the earth screen A/B;
s5.2, based on the formula U1 '═ I1' × R0, the following are determined: r0 ═ U1 '/I1'.
The invention creatively avoids the influence of interference by using the interference source as a test source, and the interference source is equivalent to an equivalent circuit of a voltage source U and an internal resistance R0, so that the purpose that the test is more accurate when the interference is larger is achieved in the test, the adverse influence caused by the interference is effectively avoided, the measurement accuracy of the ground grid on-resistance under the interference is improved, the comprehensive evaluation of the state of the regional ground grid is realized, the weak link of the ground grid is judged, the accurate monitoring is carried out on a strong interference region, namely, the accurate measure is provided, and the targeted accurate measure for reducing the ground grid interference is provided at the same time.
Further, in step S4.1, when the voltmeter data U is always smaller than the set value UInstantaneous interferenceIf the data is valid, judging that the instantaneous interference is too large, and recalculating.
Further, in step S4.4, when R0 is greater than the rule set value requirement, it is determined that there is a poor conduction between the earth nets a/B.
Further, in step S4.4, when the RO meets the regulation requirement, but I1 is greater than the set value or U1-U0 is greater than the set value, it is determined that the conduction between the earth grids a/B is good, and the interference amplitude U0 and the interference frequency F0 between the earth grids a/B are given.
Further, after the R0 is obtained, the cable shielding layer circulation between the ground grids a/B can be tested, which is as follows: connecting the cable shielding layer between the test terminal 1 and the test terminal 4 of the instrument, and observing the reading I of the ammeterCable shielding layerVoltmeter reading UCable shielding layerAnd measuring whether the circulating current of the cable shielding layer is larger than a set value or not.
Furthermore, after the R0 is obtained, the DC resistance R between the ground grids A/B can be testedDirect resistanceAnd an inductance value L, the specific process is as follows: the instrument outputs direct current and tests the average value U of voltageAverageAnd average value of current IMean value ofTo find the DC resistance R of the ground net A/BDirect resistance＝UAverage/IMean value ofAnd inductance value
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
the scheme creatively avoids the influence of interference by utilizing the interference source as a test source, the interference source is equivalent to an equivalent circuit of a voltage source U and an internal resistance R0, the purpose that the interference is larger and the test is more accurate is achieved in the test, the adverse influence caused by the interference is effectively avoided, the measurement accuracy of the ground grid conduction resistance under the interference is improved, the comprehensive evaluation of the state of the regional ground grid is realized, the weak link of the ground grid is judged, the strong interference region is accurately monitored, namely, the accurate measure is provided, and meanwhile, the targeted accurate measure for reducing the ground grid interference is provided.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
referring to fig. 1, a comprehensive tester for ground grid conduction includes an ac current source, an ammeter, a voltmeter, four test terminals, a pair of current lines, and a pair of voltage lines, where the four test terminals include a test terminal 1, a test terminal 2, a test terminal 3, and a test terminal 4, and the test method includes:
s1, assuming that the resistance between the two points A/B of the grounding grid needs to be tested, equating an interference source between the two points A/B of the grounding grid into an equivalent circuit of a voltage source U and an internal resistance R0, and then carrying out circuit connection;
s2, connecting an alternating current source between a test terminal 1 and an ammeter, connecting the other binding post of the ammeter with a test terminal 4, connecting a voltmeter between a test terminal 2 and a test terminal 3, then connecting the test terminal 1 and the test terminal 4 with a grounding grid A point through a pair of current lines respectively, and connecting the test terminal 2 and the test terminal 3 with a grounding grid B point through a pair of voltage lines respectively;
s3, monitoring the amplitude and the frequency F0 of the interference voltage U0;
s4, when the interference voltage U0 is larger than the set value UHigh interferenceAnd the duration is greater than the set value UHigh interferenceEntering a strong interference test flow, and specifically operating as follows:
s4.1, monitoring voltmeter data U in the whole process, and if the voltmeter data U is larger than the set value UInstantaneous interferenceIf the interference is determined to be instantaneous interference, the following process is restarted:
s4.2, firstly, closing the output of the instrument, directly measuring interference current I1, and recording interference voltages U1 and I1;
s4.3, adjusting the output current of the instrument to I2, and testing and recording the voltage U2 at the two ends of the A/B of the ground grid;
s4.4, according to the formulas U1 ═ U0+ I1 ═ R0 and U2 ═ U0+ I2 × R0, the following were determined: r0 ═ (U2-U1)/(I2-I1);
s5, when the interference voltage U0 is less than the set value UHigh interferenceAnd then entering a weak interference test flow, and specifically operating as follows:
s5.1, adjusting the output frequency of the instrument to be 50HZ, adjusting the current to be I1 ', and testing the voltage U1' at the two ends of the earth screen A/B;
s5.2, based on the formula U1 '═ I1' × R0, the following are determined: r0 ═ U1 '/I1'.
In step S4.1, when the voltmeter data U is always smaller than the set value UInstantaneous interferenceIf the data is valid, judging that the instantaneous interference is too large, and recalculating.
In step S4.4, when R0 is greater than the regulatory set point requirement, it is determined that there is poor conduction between the counterpoise a/B.
In step S4.4, when RO meets the regulation requirement, but I1 is greater than the set value or U1-U0 is greater than the set value, it is determined that the conduction between the earth grids a/B is good, and the interference amplitude U0 between the earth grids a/B and the interference frequency F0 are given, but in order to reduce the interference, it is recommended to strengthen the conduction.
In step S4.4 or step S5.2, after R0 is determined, a cable shield circulating current between the test grids a/B can be carried out, as follows: connecting the cable shielding layer between the test terminal 1 and the test terminal 4 of the instrument, and observing the reading I of the ammeterCable shielding layerVoltmeter reading UCable shielding layerAnd measuring whether the circulating current of the cable shielding layer is greater than a set value or not, and when the circulating current of the cable shielding layer is greater than the set value, advising that the laying of the secondary grounding network is enhanced at the position, such as the laying of a 100-square secondary grounding network, the laying of a cable bracket and other measures, so as to reduce the circulating current of the cable shielding layer.
In step S4.4 or step S5.2, after R0 is determined, a test of the DC resistance R between the grids A/B can be carried outDirect resistanceAnd an inductance value L, the specific process is as follows: the instrument outputs direct current and tests the average value U of voltageAverageAnd average value of current IMean value ofTo find the DC resistance R of the ground net A/BDirect resistance＝UAverage/IMean value ofAnd inductance value
The invention creatively avoids the influence of interference by using the interference source as a test source, and the interference source is equivalent to an equivalent circuit of a voltage source U and an internal resistance R0, so that the purpose that the test is more accurate when the interference is larger is achieved in the test, the adverse influence caused by the interference is effectively avoided, the measurement accuracy of the ground grid on-resistance under the interference is improved, the comprehensive evaluation of the state of the regional ground grid is realized, the weak link of the ground grid is judged, the accurate monitoring is carried out on a strong interference region, namely, the accurate measure is provided, and the targeted accurate measure for reducing the ground grid interference is provided at the same time.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (6)
1. The utility model provides a ground net conduction integrated test appearance which characterized in that: the testing device comprises an alternating current source, an ammeter, a voltmeter, four testing terminals, a pair of current wires and a pair of voltage wires, wherein the four testing terminals comprise a testing terminal 1, a testing terminal 2, a testing terminal 3 and a testing terminal 4, and the testing method comprises the following steps:
s1, assuming that the resistance between the two points A/B of the grounding grid needs to be tested, equating an interference source between the two points A/B of the grounding grid into an equivalent circuit of a voltage source and an internal resistance R0, and then carrying out circuit connection;
s2, connecting an alternating current source between a test terminal 1 and an ammeter, connecting the other binding post of the ammeter with a test terminal 4, connecting a voltmeter between a test terminal 2 and a test terminal 3, then connecting the test terminal 1 and the test terminal 4 with a grounding grid A point through a pair of current lines respectively, and connecting the test terminal 2 and the test terminal 3 with a grounding grid B point through a pair of voltage lines respectively;
s3, monitoring the amplitude U0 and the frequency F0 of the interference voltage;
s4, when the amplitude U0 of the interference voltage is larger than the set value UHigh interferenceAnd the duration is greater than the set value THigh interferenceEntering a strong interference test flow, and specifically operating as follows:
s4.1, monitoring voltmeter data U in the whole process, and if the voltmeter data U is larger than the set value UInstantaneous interferenceIf the interference is determined to be instantaneous interference, the following process is restarted:
s4.2, firstly, closing the output of the instrument, directly measuring interference current I1 and interference voltage U1, and recording the interference current I1 and the interference voltage U1;
s4.3, adjusting the output current of the instrument to I2, and testing and recording the voltage U2 at the two ends of the A/B of the ground grid;
s4.4, according to the formulas U1 ═ U0+ I1 ═ R0 and U2 ═ U0+ I2 × R0, the following were determined: r0 ═ (U2-U1)/(I2-I1);
s5, when the interference voltage U0 is less than the set valueUHigh interferenceAnd then entering a weak interference test flow, and specifically operating as follows:
s5.1, adjusting the output frequency of the instrument to 50HZ and the current to I1，Testing the voltage U1 at the A/B end of the ground screen，；
S5.2 according to the formula U1，＝I1，R0, find: r0 ═ U1，/I1，。
2. The earth screen conduction comprehensive tester of claim 1, characterized in that: in step S4.1, when the voltmeter data U is always less than the set value UInstantaneous interferenceIf the data is valid, judging that the instantaneous interference is too large, and recalculating.
3. The earth screen conduction comprehensive tester of claim 1, characterized in that: in step S4.4, if R0 is greater than the rule set point requirement, it is determined that there is poor conduction between the earth nets a/B.
4. The earth screen conduction comprehensive tester of claim 1, characterized in that: in step S4.4, when the R0 meets the regulation requirement, but I1 is greater than the set value or U1-U0 are greater than the set value, it is determined that the conduction between the earth grids a/B is good, and the amplitude U0 and the frequency F0 of the interference voltage between the earth grids a/B are given.
5. The earth screen conduction comprehensive tester of claim 1, characterized in that: after the R0 is obtained, the circulation of the cable shielding layer between the ground grids A/B can be tested by the following specific procedures: connecting the cable shielding layer between the test terminal 1 and the test terminal 4 of the instrument, and observing the reading I of the ammeterCable shielding layerVoltmeter reading UCable shielding layerAnd measuring whether the circulating current of the cable shielding layer is larger than a set value or not.
6. The earth screen conduction comprehensive tester of claim 1, characterized in that: after obtaining the R0The direct current resistance R between the A/B of the grounding grid can be testedDirect resistanceAnd an inductance value L, the specific process is as follows: the instrument outputs direct current and tests the average value U of voltageAverageAnd average value of current IAverageTo find the DC resistance R of the ground net A/BDirect resistance＝UAverage/IAverageAnd inductance value
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