CN112595661A - Multidimensional coupling evaluation test system for grounding grid conductor material - Google Patents
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Abstract
The invention belongs to the technical field of electrical equipment, and particularly relates to a multidimensional coupling evaluation test system for a grounding grid conductor material. The system has the advantages of simple and reasonable structure, simple operation, easy realization, obvious effect and high popularization and application values, and is the only multidimensional coupling corrosion system capable of simulating grounding grid conductors in alternating current transformer substations and direct current converter stations under complex electromagnetic environments. The test of various soil environments can be realized at one time, and the corrosion effect of the soil environments on the grounding grid conductors is researched through the interaction of the soil environments, the current, the magnetic field and the like. The method for testing by using the system is easy to realize, and the comprehensive evaluation of the anti-corrosion differential design and the service life of the grounding grid can be guided by the conclusion obtained by research.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a multidimensional coupling evaluation test system for a grounding grid conductor material.
Background
The grounding grid is a device for providing theoretical zero potential for electrical equipment, and can reliably guide voltage and current on the electrical equipment to the ground through the grounding down lead when the electrical equipment is in short circuit, or the shell of the electrical equipment has induced voltage, or the electrical equipment is struck by lightning, and the like, so that the safety of people and equipment is ensured. The grounding grid mainly comprises a grounding down lead and a grounding grid conductor, wherein the grounding down lead is a conductor for connecting power equipment and the grounding grid conductor and is made of copper, copper-clad steel, composite materials and the like; the ground net conductors are laid in a grid pattern by the conductors for dispersing the current conducted from the ground down conductor.
The grounding grid is buried underground and is influenced by the environment of soil and the external electric environment, a grounding grid conductor can generate chemical reaction, metal corrosion loss is caused, and the grounding grid conductor is broken when the metal corrosion loss is serious, so that the safe and stable operation of power equipment is influenced. At present, the research on the corrosion of the grounding grid is mainly based on the corrosion of soil, and the influence of the current on a grounding body is not considered. However, there is no effective conclusion about what influence the corrosion of the ground body can be caused by the magnitude of the current flowing into the ground grid conductor (hereinafter referred to as the ground current). Through excavation inspection, the corrosion degree of each part of the grounding grid is different, the part close to the equipment is corroded seriously, the part far away from the equipment is corroded lightly, and even no corrosion occurs. Therefore, assuming that the properties of the soil are equal everywhere, the magnitude of the ground current is significant for the corrosion of the earth grid.
The ground current is divided into alternating current, direct current and harmonic current. In an open-type substation, magnetic fields generated by the bus and other lead conductors can also penetrate through the grounding grid conductor, so that the influence on the corrosion degree of the grounding grid conductor is accelerated. The chemical environment of soil is mainly reflected in the pH value. Therefore, the chemical environment of the ground current, the magnetic field and the soil constitute the coupling corrosion factor on the multiple dimensions of the ground net conductor.
At present, no test device or system for researching the coupling corrosion of a grounding grid conductor on multidimensional factors of grounding current, a magnetic field and the chemical environment of soil and no response exists in the power industry or other industries.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a multidimensional coupling evaluation test system for a grounding grid conductor material. The invention aims to provide a test system which has reasonable structure, easily understood principle and easy realization and is suitable for researching the multi-dimensional coupling corrosion mechanism of a grounding body in a laboratory in order to explore the corrosion mechanism of the grounding current, the magnetic field and the chemical environment of soil to a grounding grid conductor.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a multidimensional coupling evaluation test system for a grounding grid conductor material is characterized in that a test container is connected with a test metal electrode, the other end of the test metal electrode is connected with a current transformer through a line, and the other end of the current transformer is sequentially connected with a straight-through current transformer, a voltmeter, an adjustable transformer, a test power supply and a grounding wire through the line; the other lead-out line on the straight-through current transformer is connected with a wiring terminal of a test metal electrode at the bottom of the test container; the side surface of the test container is connected with a magnetic field generator in a run-through manner, and the other end of the magnetic field generator is sequentially connected with a second current transformer, a second voltmeter, a second adjustable transformer and a grounding wire through a circuit; connecting; the other end of the second voltmeter is connected with the harmonic generator through a line.
Furthermore, one end of the magnetic field generator extends out of the test container and is connected with a linear conductor.
Furthermore, the other end of the magnetic field generator is connected with a second current transformer through a line with a switch K8, the test container is also connected with a line with a switch K9, and the other end of the line is connected with a line between the switch K8 and the second current transformer; one line at the other end of the second adjustable transformer is connected with a grounding wire, and the other line is connected with a switch K6 through a line provided with a switch K12; one end of the second voltmeter is connected with one end of the second adjustable transformer through a line provided with a switch K14, and the other end of the second voltmeter is connected with the harmonic generator through a line provided with a switch K11.
Furthermore, a line between the feedthrough current transformer and a test power supply is connected with switches K4, K5 and K6, a line between the switch K5 and the switch K6 is connected with a voltmeter and an adjustable transformer, and a line at the other end of the adjustable transformer is respectively connected with a lead of the voltmeter and a grounding wire; the outgoing lines of the switch K4 and the switch K5 are connected to outgoing lines at both ends of the switch K10, respectively, and a rectifier is connected between the two outgoing lines.
Furthermore, the test metal electrode is composed of a test metal material and a fastener, wherein the fastener is sleeved on the test metal material and is screwed tightly through threads on the test metal material; the fastener is a nut matched with the metal material.
Further, the current transformer and the second current transformer are both provided with quick-break protection.
Furthermore, the test container is made of a polyethylene transparent material, a container cover plate with holes is arranged at the upper part of the test container, the interior of the test container is divided into a plurality of small containers through partition plates, a graphite electrode is embedded at the bottom of each small container, and the graphite electrodes are grounded through a grounding wire; and a test metal electrode is arranged in each small container, and the other end of each test metal electrode is connected with the current transformer through a circuit provided with a switch.
Further, the magnetic field generator is an ampere loop, and when current is introduced into the ampere loop, a transverse magnetic field is generated in the ampere loop.
Further, the test method for the multidimensional coupling evaluation test system of the grounding grid conductor material comprises the following steps:
step 1, selecting three soil samples or equivalent solutions with different acid-base degrees;
step 5, evaluating the corrosion of the alternating magnetic field, the harmonic current and the alternating current to the test metal material;
step 6, evaluating the corrosion of the direct current to the metal electrode;
and 7, evaluating the corrosion of the direct current magnetic field and the direct current to the test metal material.
Further, the step 1 of selecting three soil samples or equivalent solutions with different acid-base degrees comprises the following steps:
the pH of a first soil sample is =7, the pH of a second soil sample is greater than 7, the pH of a third soil sample is less than 7, the first soil sample and the third soil sample are respectively arranged in three small containers in a test container, a test metal material is embedded in the soil samples, and when the soil samples or equivalent solutions are different, the test metal material is the same material; when the soil sample or the equivalent solution is the same, the test metal material takes three different materials for comparative analysis;
and 3, evaluating the corrosion of the alternating current to the test metal material, which comprises the following steps:
switches K6, K5, K4 and K1-K3 are switched on, the adjustable transformer is adjusted, alternating current forms a loop through a metal electrode and a graphite electrode at the bottom of the container, and the current dispersion condition of a transformer substation grounding grid conductor to the current is simulated; adjusting the phase shifter to change the phase of the current into a capacitive current, an inductive current or a resistive current;
and 4, evaluating the corrosion of the harmonic current and the alternating current to the test metal material in the step 4, wherein the evaluation comprises the following steps:
on the basis of corrosion evaluation of alternating current on a test metal material, switches K11 and K13 are switched on, a harmonic generator is adjusted until a desired current waveform and frequency are reached, and harmonic corrosion of a transformer substation grounding grid conductor caused by corona and the like is simulated;
and 5, evaluating the corrosion of the alternating magnetic field, the harmonic current and the alternating current to the test metal material, wherein the evaluation comprises the following steps:
on the basis of corrosion evaluation of harmonic current on a test metal material, switches K12, K14, K10, K8 and K9 are switched on, an adjustable transformer is adjusted, a magnetic field generator generates a transverse magnetic field and a longitudinal magnetic field, a magnetic field generated by a bus of an open-type transformer substation is simulated, and comprehensive multi-dimensional coupling corrosion evaluation is carried out on the test metal material together with alternating current and harmonic;
the corrosion evaluation of the metal electrode 14 by the direct current in the step 6 comprises the following steps:
on the basis of the step 2, switches K6, K5, K13, K7 and K1-K3 are switched on, the adjustable transformer is adjusted, and the rectifier rectifies the original alternating current into direct current for simulating the corrosion condition of the direct current converter station on the test metal material;
and 7, the corrosion evaluation of the direct current magnetic field and the direct current on the test metal material in the step 7 comprises the following steps:
on the basis of corrosion evaluation of direct current on a test metal material, switches K8 and K9 are switched on, a magnetic field generator generates a constant transverse magnetic field and a constant longitudinal magnetic field, magnetic fields generated by a bus of a direct current converter station and the like are simulated, and the magnetic fields and the direct current jointly perform comprehensive multi-dimensional coupling corrosion evaluation on the test metal material.
The invention has the following beneficial effects and advantages:
the system has the advantages of simple and reasonable structure, simple operation, easy realization, obvious effect and high popularization and application values, and is the only multidimensional coupling corrosion system capable of simulating grounding grid conductors in alternating current transformer substations and direct current converter stations under complex electromagnetic environments.
The system can realize the test of various soil environments at one time, and researches the corrosion effect of the soil environments on the grounding grid conductor through the interaction of the soil environments, current, magnetic fields and the like;
the method for testing by using the system is easy to realize, and the comprehensive evaluation of the anti-corrosion differential design and the service life of the grounding grid can be guided by the conclusion obtained by research.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a general block diagram of a test apparatus according to the present invention;
FIG. 2 is a schematic view of the structure of a test metal electrode according to the present invention;
fig. 3 is a schematic structural view of a cover plate of a container according to the present invention.
In the figure:
the device comprises a test metal electrode 1, a test container 2, a container cover plate 3, a ground wire 4, a phase shifter 5, a rectifier 6, an adjustable transformer 7, a test power supply 8, a current transformer 9, a voltmeter 10, a magnetic field generator 11, a harmonic generator 12, a real-time monitoring system 13, a test metal material 14, a fastener 15, a through type current transformer 16, a second current transformer 99, a second voltmeter 100 and a second adjustable transformer 77.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The solution of some embodiments of the invention is described below with reference to fig. 1-3.
Example 1
The invention relates to a multidimensional coupling evaluation test system for a grounding grid conductor material, which is shown in figure 1, wherein figure 1 is a general structure diagram of a test device disclosed by the invention.
The system comprises a test metal electrode 1, a test container 2, a container cover plate 3, a grounding wire 4, a phase shifter 5, a rectifier 6, an adjustable transformer 7, a test power supply 8, a current transformer 9, a voltmeter 10, a magnetic field generator 11, a harmonic generator 12, a real-time monitoring system 13, a feed-through current transformer 16 and a switch.
The test container 2 is connected with a test metal electrode 1, the other end of the test metal electrode 1 is connected with a current transformer 9 through a line with a switch, the other end of the current transformer 9 is connected with a straight-through current transformer 16 through a line, the other end of the straight-through current transformer 16 is connected with a test power supply 8 through a line, and the other end of the test power supply 8 is connected with a grounding wire 4. The side surface of the test container 2 is connected with a magnetic field generator 11 in a penetrating way, and one end of the magnetic field generator 11 extends out of the test container 2 and is connected with a linear conductor; the other end of the magnetic field generator 11 is connected with a second current transformer 99 through a line with a switch K8; the test container 2 is also connected to a line with a switch K9, the other end of the line being connected to a line between the switch K8 and a second current transformer 99. The other end of the second current transformer 99 is connected with the second voltmeter 100 and the second adjustable transformer 77 through a line; the second variable transformer 77 is connected at its other end to the ground line 4 via a line with a switch K12 and to a switch K6 via a line with a switch K12. One end of the second voltmeter 100 is connected to one end of the second adjustable transformer 77 through a line provided with a switch K14, and the other end of the second voltmeter 100 is further connected to the harmonics generator 12 through a line provided with a switch K11.
Three switches K4, K5, and K6 are connected to a line between the feedthrough current transformer 16 and the test power supply 8, and a voltmeter 10 and an adjustable transformer 7 are connected to a line between the switch K5 and the switch K6. The other end of the adjustable transformer 7 is connected to the lead of the voltmeter 10 and the ground line 4. The other lead-out line on the feed-through current transformer 16 is connected with a wiring terminal of the test metal electrode 1 at the bottom of the test container 2.
The outgoing lines of the switch K4 and the switch K5 are connected to outgoing lines at both ends of the switch K10, respectively, and the rectifier 6 is connected between the two outgoing lines.
Wherein the test metal electrode 1 is composed of a test metal material 14 and a fastener 15.
The current transformer 9 and the second current transformer 99 are both provided with fast disconnection protection.
The switch is a high-power switch K1-K14.
As shown in fig. 2, fig. 2 is a schematic structural view of a test metal electrode in the present invention. The test metal electrode 1, i.e. the simulated grounding grid conductor, is made of a metal material which is the same as the actual grounding body, and the material can be galvanized steel, copper-clad steel, pure copper, steel, a composite material conductor and the like. The cross-sectional diameter of the metal material is 18mm, and the surface is threaded. The fastener 15 is a nut with the diameter of 18mm, the nut can be matched with a metal material, and the nut is sleeved on the test metal material 14 and is screwed up through threads on the test metal material 14.
The test container 2 is made of polyethylene transparent material which is not affected by acid-base corrosion, and the test condition inside the container can be observed by naked eyes. The interior of the container can be divided into two or three small containers according to the test requirements, and the partition plates are made of polyethylene materials. The bottom of each small container is composed of a graphite electrode, the diameter of the graphite electrode is 30mm, the thickness of the graphite electrode is the same as that of the test container 2, the graphite electrode is embedded in the middle of the bottom of the test container 2, and waterproof treatment is carried out. Each graphite electrode is grounded via a down conductor, i.e. a ground line 4.
Fig. 3 is a schematic structural view of a cover plate of a container according to the present invention, as shown in fig. 3. The cover plate 3 is also made of a transparent hard insulating material to facilitate observation of the test conditions, and has a hole for inserting the test metal material 14 into the test container 2. Each small container in the test container 2 is connected with a real-time monitoring system 13 for monitoring the pH value, the temperature, the humidity, the timing and the like in the container in real time. The sensors for testing the pH value, temperature and humidity inside the container are connected with the monitoring system 13 through data wires and through holes on the side surface of the test container 2, the holes are subjected to waterproof treatment, and the display part of the monitoring system 13 is adhered to the outer side surface of the test container 2. The container cover plate 3 is rectangular, the length and the width of the container cover plate are the same as those of the test container 2, during the test, the metal electrode 1 firstly penetrates through the cover plate and then covers the test container 2, after the test is finished, the cover plate is taken down, and then the test metal electrode 1 is taken down.
The ground line 4 may be a soft ground line. The purpose of providing each capsule with a separate ground wire is to reduce the accuracy of the test, one from the other.
The phase shifter 5 can shift the phase of the original current, so that the property of the current is changed into capacitive current, inductive current or resistive current, and the phase shifter is used for simulating the influence of the currents with different properties on the grounding grid conductor.
The rectifier 6 can rectify the original alternating current into direct current for simulating the condition of the direct current converter station.
The magnetic field generator 11 is an ampere loop, and when current is introduced into the ampere loop, a transverse magnetic field is generated in the loop, and a longitudinal magnetic field is generated around a linear conductor and used for simulating a magnetic field generated by an open-type substation bus and the like.
The harmonic generator 12 is a generator for generating each harmonic, and is adjustable in current waveform and frequency, and used for simulating harmonic interference generated on a grounding conductor by a transformer substation corona and the like.
The feedthrough current transformer 16 is a device for generating a large current, and converts the original current of the adjustable transformer 7 into the large current required by the test.
The test power supply 8, the current transformer 9, the voltmeter 10 and the high-power switch K1-K14 are auxiliary devices of a test system, wherein the test power supply 8 can be supplied with 220V of mains supply, and the power is enough; the current transformer 9 and the voltmeter 10 read the current value and the voltage value during the test, and a loop can be timely disconnected when a system is in a ground short circuit; the number of the high-power switches K1-K14 is 14.
During the test, different soil samples are taken, the acid-base property of the soil samples can be selected according to the purpose of the test, for example, three soil samples are taken, the pH of the first soil sample is =7, the pH of the second soil sample is more than 7, the pH of the third soil sample is less than 7, and the three soil samples are respectively placed in three small containers. Then the test metal material 14 is inserted into the soil sample through the container cover plate 3 and is fixed by the fixing nut, then the test metal material 14 is connected with a current source, and different influencing factors such as current properties, harmonic waves, a magnetic field and the like are loaded, so that the multidimensional coupling research of the corrosion influence of the current on the grounding body can be carried out.
Example 2
The invention also provides an embodiment, and in specific implementation, the test method for the grounding grid conductor material multi-dimensional coupling evaluation test system comprises the following steps:
step 1, selecting three soil samples or equivalent solutions with different acid-base degrees.
The first soil sample had a pH =7, the second soil sample had a pH > 7, and the third soil sample had a pH < 7, and were contained in three small containers in the test container 2, respectively, while the test metal material 14 was buried in the soil sample in the manner shown in fig. 1. When the soil sample or equivalent solution is different, the test metallic material 14 is the same material. When the soil sample or equivalent solution is the same, the test metallic material 14 can take three different materials for comparative analysis;
and 3, evaluating the corrosion of the test metal material 14 by the alternating current.
And the switches K6, K5, K4 and K1-K3 are switched on, the adjustable transformer 7 is adjusted, and at the moment, alternating current forms a loop through a metal electrode and a graphite electrode at the bottom of the container, so that the current dispersion condition of a transformer substation grounding grid conductor is simulated. The phase shifter 5 is adjusted to change the phase of the current into a capacitive current, an inductive current or a resistive current.
And 4, evaluating the corrosion of the harmonic current and the alternating current to the test metal material 14.
On the basis of the corrosion evaluation of the alternating current on the test metal material 14, the switches K11 and K13 are switched on, the harmonic generator 12 is adjusted to the desired current waveform and frequency, and the harmonic corrosion of the corona and the like on the grounding grid conductor of the transformer substation is simulated.
And 5, evaluating the corrosion of the alternating magnetic field, the harmonic current and the alternating current to the test metal material 14.
On the basis of corrosion evaluation of harmonic current on the test metal material 14, switches K12, K14, K10, K8 and K9 are switched on, the adjustable transformer 7 is adjusted, the magnetic field generator 11 generates a transverse magnetic field and a longitudinal magnetic field, magnetic fields generated by open-type substation buses and the like are simulated, and comprehensive multi-dimensional coupling corrosion evaluation is carried out on the test metal material 14 together with alternating current and harmonic.
And 6, evaluating the corrosion of the metal electrode 14 by the direct current.
And (3) switching on switches K6, K5, K13, K7 and K1-K3 on the basis of the step 2, adjusting the adjustable transformer 7, and rectifying the original alternating current into direct current by the rectifier 6 at the moment for simulating the corrosion condition of the direct current converter station on the test metal material 14.
And 7, evaluating the corrosion of the direct current magnetic field and the direct current to the test metal material 14.
On the basis of corrosion evaluation of the direct current on the test metal material 14, the switches K8 and K9 are switched on, the magnetic field generator 11 generates a constant transverse magnetic field and a constant longitudinal magnetic field, simulates a magnetic field generated by a bus of a direct current converter station and the like, and carries out comprehensive multi-dimensional coupling corrosion evaluation on the test metal material 14 together with the direct current.
The chemical environment of the ground current, the magnetic field and the soil forms a multidimensional coupling corrosion factor of the grounding grid conductor.
The soil corrosion factors described in the present invention include various factors such as soil resistivity, acidity and alkalinity, instantaneous corrosion rate, average corrosion rate, water content, and the like.
The system mainly considers the acidity and alkalinity of soil, and divides a test container into three small containers, each small container corresponds to the acid soil, the neutral soil and the alkaline soil, and each small container has a respective grounding point, so that current independently forms a loop.
The selection of the grounding grid conductor material can be the same as the actual grounding grid material, such as galvanized steel, copper-clad steel, pure copper and the like. In order to facilitate the comparative analysis of test results, the size of the grounding grid conductor should be consistent.
The power supply is provided by an adjustable transformer and is connected with each grounding grid conductor through a switch, a phase shifter and an ammeter.
The alternating current, the direct current, the harmonic current and the power frequency magnetic field can be independently or comprehensively loaded on the grounding grid conductor to comprehensively evaluate the corrosion degree of the grounding grid conductor.
Example 3
The invention also provides an embodiment, and the multidimensional coupling evaluation test system for the grounding grid conductor material adopts various different test metal materials 14 and different acid-base soil, and simultaneously simulates the environment of alternating current, harmonic current and alternating current magnetic field to comprehensively evaluate the multidimensional coupling corrosion of the test metal materials 14.
The magnitude of the current flowing through the test metal material 14 can be visually adjusted, the influence of different current values on the test metal material 14 can be researched, and the pH value, the temperature, the humidity, the timing and the like in the soil can be monitored in real time.
Otherwise, the same as in examples 1 and 2.
Example 4
The invention also provides an embodiment, and the multidimensional coupling evaluation test system for the grounding grid conductor material adopts various different test metal materials 14 and different acid-base soil, and simultaneously simulates the environment of direct current and direct current magnetic field to comprehensively evaluate the multidimensional coupling corrosion of the test metal materials 14.
Otherwise, the same as in examples 1 and 2.
The magnitude of the current flowing through the test metal material 14 can be visually adjusted, the influence of different current values on the test metal material 14 can be researched, and the pH value, the temperature, the humidity, the timing and the like in the soil can be monitored in real time.
In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "connected" and "fixed" are to be construed broadly, e.g., "connected" may be a fixed connection, a removable connection, or an integral connection. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the indicated devices or units must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multidimensional coupling evaluation test system for a grounding grid conductor material is characterized in that: the testing container (2) is connected with a testing metal electrode (1), the other end of the testing metal electrode (1) is connected with a current transformer (9) through a line, and the other end of the current transformer (9) is sequentially connected with a straight-through current transformer (16), a voltmeter (10), an adjustable transformer (7), a testing power supply (8) and a grounding wire (4) through a line; the other lead-out line on the straight-through current transformer (16) is connected with a wiring terminal of a test metal electrode (1) at the bottom of the test container (2); the side surface of the test container (2) is connected with a magnetic field generator (11) in a penetrating way, and the other end of the magnetic field generator (11) is sequentially connected with a second current transformer (99), a second voltmeter (100), a second adjustable transformer (77) and a grounding wire (4) through a circuit; connecting; the other end of the second voltmeter (100) is connected with the harmonic generator (12) through a line.
2. The system of claim 1, wherein the system comprises: one end of the magnetic field generator (11) extends out of the test container (2) and is connected with a linear conductor.
3. The system of claim 1, wherein the system comprises: the other end of the magnetic field generator (11) is connected with a second current transformer (99) through a line with a switch K8, the test container (2) is also connected with a line with a switch K9, and the other end of the line is connected with a line between the switch K8 and the second current transformer (99); one line at the other end of the second adjustable transformer (77) is connected with the grounding wire (4), and the other line is connected with a switch K6 through a line provided with a switch K12; one end of the second voltmeter (100) is connected with one end of the second adjustable transformer (77) through a line provided with a switch K14, and the other end of the second voltmeter (100) is connected with the harmonic generator (12) through a line provided with a switch K11.
4. The system of claim 1, wherein the system comprises: the circuit between the feed-through current transformer (16) and the test power supply (8) is connected with switches K4, K5 and K6, the circuit between the switch K5 and the switch K6 is connected with a voltmeter (10) and an adjustable transformer (7), and the circuit at the other end of the adjustable transformer (7) is respectively connected with a lead of the voltmeter (10) and a grounding wire (4); the outgoing lines of the switch K4 and the switch K5 are respectively connected with outgoing lines at two ends of the switch K10, and a rectifier (6) is connected between the two outgoing lines.
5. The system of claim 1, wherein the system comprises: the test metal electrode (1) is composed of a test metal material (14) and a fastener (15), wherein the fastener (15) is sleeved on the test metal material (14) and is screwed tightly through threads on the test metal material (14); the fastening member (15) is a nut fitted with a metal material.
6. The system of claim 1, wherein the system comprises: the current transformer (9) and the second current transformer (99) are both provided with quick-break protection.
7. The system of claim 1, wherein the system comprises: the test container (2) is made of a polyethylene transparent material, a container cover plate (3) with holes is arranged at the upper part of the test container (2), the interior of the test container (2) is divided into a plurality of small containers through partition plates, a graphite electrode is embedded at the bottom of each small container, and the graphite electrodes are grounded through a grounding wire (4); and each small container is internally provided with a test metal electrode (1), and the other end of each test metal electrode (1) is connected with a current transformer (9) through a circuit provided with a switch.
8. The system of claim 1, wherein the system comprises: the magnetic field generator (11) is an ampere loop in which a transverse magnetic field is generated when a current is passed through the ampere loop.
9. The test method for the multidimensional coupling evaluation test system of the grounding grid conductor material as claimed in claim 1, wherein the test method comprises the following steps: the method comprises the following steps:
step 1, selecting three soil samples or equivalent solutions with different acid-base degrees;
step 2, enabling the test metal material to penetrate through a hole in the container cover plate, and fixing the test metal material on the container cover plate by using a nut;
step 3, evaluating the corrosion of the alternating current to the test metal material;
step 4, evaluating the corrosion of the harmonic current and the alternating current to the test metal material;
step 5, evaluating the corrosion of the alternating magnetic field, the harmonic current and the alternating current to the test metal material;
step 6, evaluating the corrosion of the direct current to the metal electrode;
and 7, evaluating the corrosion of the direct current magnetic field and the direct current to the test metal material.
10. The test method for the multidimensional coupling evaluation test system of the grounding grid conductor material as claimed in claim 9, wherein the test method comprises the following steps: the step 1 of selecting three soil samples or equivalent solutions with different acid-base degrees comprises the following steps:
the pH of a first soil sample is =7, the pH of a second soil sample is greater than 7, the pH of a third soil sample is less than 7, the first soil sample and the third soil sample are respectively arranged in three small containers in a test container, a test metal material is embedded in the soil samples, and when the soil samples or equivalent solutions are different, the test metal material is the same material; when the soil sample or the equivalent solution is the same, the test metal material takes three different materials for comparative analysis;
and 3, evaluating the corrosion of the alternating current to the test metal material, which comprises the following steps:
switches K6, K5, K4 and K1-K3 are switched on, the adjustable transformer is adjusted, alternating current forms a loop through a metal electrode and a graphite electrode at the bottom of the container, and the current dispersion condition of a transformer substation grounding grid conductor to the current is simulated; adjusting the phase shifter to change the phase of the current into a capacitive current, an inductive current or a resistive current;
and 4, evaluating the corrosion of the harmonic current and the alternating current to the test metal material in the step 4, wherein the evaluation comprises the following steps:
on the basis of corrosion evaluation of alternating current on a test metal material, switches K11 and K13 are switched on, a harmonic generator is adjusted until a desired current waveform and frequency are reached, and harmonic corrosion of a transformer substation grounding grid conductor caused by corona and the like is simulated;
and 5, evaluating the corrosion of the alternating magnetic field, the harmonic current and the alternating current to the test metal material, wherein the evaluation comprises the following steps:
on the basis of corrosion evaluation of harmonic current on a test metal material, switches K12, K14, K10, K8 and K9 are switched on, an adjustable transformer is adjusted, a magnetic field generator generates a transverse magnetic field and a longitudinal magnetic field, a magnetic field generated by a bus of an open-type transformer substation is simulated, and comprehensive multi-dimensional coupling corrosion evaluation is carried out on the test metal material together with alternating current and harmonic;
the corrosion evaluation of the metal electrode 14 by the direct current in the step 6 comprises the following steps:
on the basis of the step 2, switches K6, K5, K13, K7 and K1-K3 are switched on, the adjustable transformer is adjusted, and the rectifier rectifies the original alternating current into direct current for simulating the corrosion condition of the direct current converter station on the test metal material;
and 7, the corrosion evaluation of the direct current magnetic field and the direct current on the test metal material in the step 7 comprises the following steps:
on the basis of corrosion evaluation of direct current on a test metal material, switches K8 and K9 are switched on, a magnetic field generator generates a constant transverse magnetic field and a constant longitudinal magnetic field, magnetic fields generated by a bus of a direct current converter station and the like are simulated, and the magnetic fields and the direct current jointly perform comprehensive multi-dimensional coupling corrosion evaluation on the test metal material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114152727A (en) * | 2021-11-12 | 2022-03-08 | 西南交通大学 | Grounding grid soil risk assessment method considering water content |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114152727A (en) * | 2021-11-12 | 2022-03-08 | 西南交通大学 | Grounding grid soil risk assessment method considering water content |
| CN114152727B (en) * | 2021-11-12 | 2022-08-05 | 西南交通大学 | Grounding grid soil risk assessment method considering water content |
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