CN113300259A - Power station grounding grid water immersion and resistance reduction protection device and method - Google Patents
Power station grounding grid water immersion and resistance reduction protection device and method Download PDFInfo
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- CN113300259A CN113300259A CN202110505142.3A CN202110505142A CN113300259A CN 113300259 A CN113300259 A CN 113300259A CN 202110505142 A CN202110505142 A CN 202110505142A CN 113300259 A CN113300259 A CN 113300259A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B5/00—Non-enclosed substations; Substations with enclosed and non-enclosed equipment
- H02B5/01—Earthing arrangements, e.g. earthing rods
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Engineering & Computer Science (AREA)
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Abstract
The utility model provides a device and a method for protecting and reducing resistance of a power station grounding grid after being immersed in water, which comprises the following steps: the resistance reducing unit is used for shunting current of a power station grounding grid and comprises a plurality of serially connected sacrificial anodes arranged in a water immersion manner; the test unit is used for collecting the state data of the sacrificial anode and calculating the number of the sacrificial anodes required in the resistance reducing unit and the service life of the sacrificial anodes; and the cable unit is used for connecting the resistance reducing unit and the testing unit. The grounding grid meets the requirements of resistance reduction and corrosion prevention, and is used for the resistance reduction and corrosion prevention requirements of the power station grounding grid in the high soil resistivity area.
Description
Technical Field
The disclosure belongs to the technical field of corrosion prevention and resistance reduction of an electric power grounding body, and particularly relates to a device and a method for protecting and reducing resistance of a power station grounding grid after water immersion and shading.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The economic development greatly promotes the demand of China on electricity consumption, electric facilities such as power stations and the like can be quickly constructed, and the technical and construction difficulties of the construction of the electric facilities are increased due to the complex terrain and soil conditions; for example, when the grounding parameters such as grounding resistance cannot meet the safety requirements, the safety of grounding engineering can be reduced, and further safety accidents can occur, which bring many unnecessary losses to the country. Therefore, in order to ensure the reliability and stability of grounding engineering, research on grounding resistance reduction of a grounding grid is necessary; by improving the resistance reduction method of the grounding grid, the problem of resistance reduction under complex conditions is solved, the grounding effect is further improved on the premise of ensuring safe and stable operation of the power transmission and transformation project, and the construction difficulty and cost are reduced.
In areas with high soil resistivity, the grounding accidents of a power system are frequent, and the most common construction methods for solving the problem mainly comprise the following three types: the first method is to expand the grounding grid on the horizontal plane or develop the grounding grid in the depth direction, increase the area of the grounding grid or reduce the resistance by utilizing an underground low resistivity layer, and the method has the advantages of relatively high cost, large construction difficulty, unobvious actual effect and easy limitation of the used area; the second type is that the resistance reducing agent is laid around the grounding grid to play a role in reducing resistance and preventing corrosion of a grounding body, but the resistivity and corrosion inhibition of most of the resistance reducing agent do not reach relevant standards, so that the contradiction which cannot be considered between resistance reduction and corrosion prevention occurs; the third method is to lead the ground to the reinforcement bars or additional grounding nets of the foundations of nearby reservoir dams and the like, and connect the reinforcement bars or the additional grounding nets with the main grounding net to reduce the grounding resistance. Heretofore, there is no resistance reduction mode with general popularization and economic adaptation value.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a device and a method for protecting and reducing resistance of a power station grounding network after being soaked in water, so that the requirements of reducing resistance and preventing corrosion of the grounding network are met, and the device and the method are used for reducing resistance and preventing corrosion of the power station grounding network in areas with high soil resistivity.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of this disclosure provides a power station grounding grid water logging protects and falls and hinders device.
A power station grounding grid water immersion yin protection resistance reduction device comprises:
the resistance reducing unit is used for shunting current of a power station grounding grid and comprises a plurality of serially connected sacrificial anodes arranged in a water immersion manner;
the test unit is used for collecting the state data of the sacrificial anode, calculating the number of the sacrificial anodes required in the resistance reducing unit and the service life of the sacrificial anodes, and preventing abnormal working states;
a cable unit for connecting the resistance reducing unit and the testing unit
The second aspect of the disclosure provides a method for protecting and reducing resistance of a power station grounding grid after being immersed in water.
A method for protecting and reducing resistance of a power station grounding network after being immersed in water comprises the following steps:
obtaining the maximum grounding short-circuit current of the grounding grid through the test unit, and determining a qualified grounding resistance value in the grounding grid;
calculating the grounding resistance value required by the cathode protection resistance reduction device according to the determined qualified grounding resistance value;
the grounding resistance value of a single resistance reducing unit is reduced by adding a resistance reducing agent and increasing the number of sacrificial anodes.
Compared with the prior art, the beneficial effect of this disclosure is:
the scheme for reducing the ground resistance of the power system adopts a sacrificial anode with a cathodic protection function, and utilizes the loss of electrons to provide protection current for a grounding body so as to prevent the grounding body from being corroded. Meanwhile, the environment is an artificial low-resistance environment, the artificial low-resistance environment is used as an extension of the grounding grid through the connection of the wires, the grounding area is increased, and the low-resistance environment is utilized, so that the total grounding resistance of the grounding grid is directly reduced; the designed water immersion structure and the selected bentonite are combined, so that the water adsorption is effectively ensured, the working environment of the anode set is stabilized, and the influence of seasonal changes is avoided; by adopting the water immersion type structure, the whole device can be conveniently checked, controlled and improved; the corrosion inhibitor can slow down the consumption speed of the anode, ensure the stable release of electrons from the anode and prolong the service life; through the arrangement of the test unit, the access and control of the anode and the acquisition of data of corrosion potential are facilitated, and the occurrence of 'over-protection', 'under-protection' and the like can be prevented. The sacrificial anode will also enable the draining of stray interference currents in the station, preventing corrosion thereof.
The novel scheme for reducing the resistance of the grounding body in the high-resistance area is generally suitable for a power station connection system needing resistance reduction, and is simple in construction, low in material cost, small in occupied area and environment-friendly. The resistance reduction effect is obvious in the aspect of reducing the resistance, the dynamic adjustment can be carried out according to the situation after construction, for example, the anode is increased or decreased, the resistance reducing agent is added, the corrosion inhibitor is added, the ion concentration in the pool pit mixture can be adjusted through the control of water, and the like, and the method has obvious superiority compared with other resistance reduction modes; the quantity and the arrangement can be adjusted according to the engineering condition, the design is flexible, and the limitation is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a power station grounding grid water immersion and resistance reduction device in a first embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a pool pit section of a power station grounding grid water immersion and resistance reduction device in a first embodiment of the disclosure;
wherein, 1, brick, 2, bottom material, 3, sacrificial anode, 4, covering material, 5 and water.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example one
The first embodiment of the disclosure provides a device for protecting and reducing resistance of a power station grounding grid after being immersed in water.
As shown in fig. 1 and fig. 2, a water immersion and resistance reduction device for a power station grounding grid comprises:
the resistance reducing unit is used for shunting current of a power station grounding grid and comprises a plurality of serially connected sacrificial anodes arranged in a water immersion manner;
the testing unit is used for acquiring state data of the sacrificial anodes, calculating the number of the sacrificial anodes required in the resistance reducing unit and the service life of the sacrificial anodes, dynamically adjusting according to the condition in the construction process, and determining the using number of the anodes in a single resistance reducing unit; the water immersion type cathode protection of the sacrificial anode is adopted, and the consumption speed of the anode is slowed down by the corrosion inhibitor, so that the anode is ensured to stably release electrons, and the service life is prolonged;
and the cable unit is used for connecting the resistance reducing unit and the testing unit.
In one or more embodiments, the test unit includes a test peg and a binding post; the testing pile adopts a potential testing pile and comprises a buried reference electrode, a buried test piece, a grounding grid and an anode group.
As one or more embodiments, the power station grounding grid water immersion and negative resistance reduction device further comprises a pool pit, a bottom material, a covering material, a water inlet pipe, a cover plate and a connecting unit.
As one or more embodiments, the pool pit is arranged at a position 1-2 m away from the periphery of the grounding grid, the minimum length is set to be 2m, the minimum width is set to be 1.5m, and the depth H is set to be the depth H of the buried body plus 20 cm; the periphery of the pool pit is built by bricks, half brick intervals are reserved between the bricks on the same layer around the pool pit from the pool bottom to half depth H, and the upper layer and the lower layer are arranged in a cross way so as to reserve water seepage holes; and sealing the periphery of the pool pit from the half depth of the pool bottom to 0.5H to the top H of the pool pit by using cement. The water in the pool pit can be used water in the station or collected rainwater, and the water level needs to be kept in a normally full state; this kind of structure setting in this embodiment is in order to reduce the first half water that divides near the earth's surface in the pond hole and runs off fast, guarantees simultaneously that the hydroenergy of the pit the latter half continues outwards infiltration.
As one or more embodiments, the bottom material is composed of petroleum coke, graphite powder, bentonite and a corrosion inhibitor according to the proportion of 16:8:20:1, the petroleum coke, the graphite powder, the bentonite and the corrosion inhibitor are dry-mixed and then mixed with water, the mixture is uniformly thrown into the bottom of the tank, and the thickness of the bottom material is set to be 20 cm;
petroleum coke: the fixed carbon content is more than 98.5 percent, and the granularity is 1-3 mm;
graphite powder: the carbon content is more than or equal to 98.5 percent, and the granularity is less than or equal to 5 mu m;
bentonite: industrial grade sodium/calcium bentonite
Corrosion inhibitor: the main component is Na2B4O7、Na2MoO4And NaNO2Mixing at a mass ratio of 1: 1.
In one or more embodiments, the casing is composed of bentonite, the bentonite has the same composition as the bentonite in the base, and the conditioning agent may be applied subsequently as appropriate.
As one or more embodiments, the water inlet pipe is connected with water in the station and used for injecting water into the pool, and a floating ball water stop valve is arranged at the water inlet pipe to control the water level and timely supplement the water so as to keep the water level above 0.5H. In the present embodiment, the height of the water stop valve is set to 0.8H.
As one or more embodiments, the cover plate is a sealing cover at the top of the pool pit so as to reduce evaporation and prevent sundries from falling in; the cover plate is formed by combining a plurality of cement cover plates, and the cover plate can also be made of toughened glass with the edge adhered with anti-collision rubber, so that the observation during the period and the later-stage cover opening inspection are facilitated.
In one or more embodiments, the connection unit is used for connecting the main grounding grid and the combined anode unit.
In one or more embodiments, the combined anode unit employs a plurality of magnesium-based sacrificial anodes connected in series; the magnesium-based sacrificial anode is set to 700 × (100+120) × 102mm in specification and to a dry weight of 14.0 kg.
The calculation process of the number n of sacrificial anodes of single resistance reducing units in the power station grounding grid water immersion and yin protection resistance reducing device is as follows:
(1) determination of the total current I of the cathodic protectionGeneral assembly
IGeneral assembly＝i*S；
Wherein S represents the total area of cathodic protection (m)2) And i represents a protective current density (A/m)2)。
(2) The sacrificial anode is embedded horizontally, and the anode is grounded
Wherein R represents the ground resistance (Ω) of the horizontally buried anode, ρ represents the soil resistivity (Ω · m), L represents the length of the sacrificial anode, and D1Representing the thickness of the filler, D representing the equivalent diameter of the sacrificial anode, and t representing the distance from the center of the sacrificial anode to the ground.
(3) Generated current I of sacrificial anodea＝ΔE/R
Wherein, IaThe current value (A/branch) of the single sacrificial anode is shown, delta E represents the driving potential (V) of the sacrificial anode, the magnesium anode takes 0.65V, and R represents the grounding resistance (omega) of the sacrificial anode.
(4) Lifetime of sacrificial anode
Wherein t represents the useful life (a), W represents the net weight (Kg) of each sacrificial anode, E represents the consumption rate (Kg/(A. a)) of each sacrificial anode, μ represents the effective utilization coefficient (generally 0.65) of the sacrificial anode, and I represents the effective utilization coefficient of the sacrificial anodemRepresents the average generation current (mA/m) of each sacrificial anode2)。
(5) Total amount of sacrificial anode
Wherein N represents the number (branch) of the sacrificial anodes, R represents the grounding resistance (omega) of a single sacrificial anode, and R represents the grounding resistance (omega) of a single sacrificial anodeaRepresents a qualified value of the grounding resistance (R) in the grounding gridaAccording to GB 50065-2011' JiaozuGrounding design Specification of galvanic electric device 4.2.1, grounding resistance of effective grounding system grounding net should conform to
(equation 4.2.1-1, maximum in-ground short circuit current I of the grounded screen). When the grounding resistance does not meet the requirement of the formula 4.2.1-1, the grounding resistance can be properly increased through the technical economy, the grounding potential of a grounding network can be increased to 5000V, R is less than or equal to 5000/I), and eta represents a shielding coefficient (the general empirical value is 0.52, and can be properly adjusted according to the actual field).
(6) Computing
The required number of the anodes and the service life of the anodes can be calculated by combining the steps, and the number n of the used anodes is determined according to the number of units and distribution requirements which can be implemented on site.
The invention provides a scheme for reducing the grounding resistance of a power system, and designs a water immersion cathode protection resistance reducing device, wherein a sacrificial anode with a cathode protection function is adopted, and electrons are lost to provide protection current for a grounding body so as to prevent the grounding body from being corroded; meanwhile, the environment is an artificial low-resistance environment, the artificial low-resistance environment is used as an extension of the grounding grid through the connection of the wires, the grounding area is increased, and the low-resistance environment is utilized, so that the total grounding resistance of the grounding grid is directly reduced. Meanwhile, the selected petroleum coke and graphite powder can exert the conductivity, so that the grounding effect is ensured. The designed water immersion structure and the selected bentonite can effectively ensure the water adsorption, stabilize the working environment of the anode set and avoid the influence of seasonal changes. The selected corrosion inhibitor can slow down the consumption speed of the anode, ensure the stable release of electrons from the anode and prolong the service life; the method is generally applicable to power station connection systems needing resistance reduction.
The whole system is greatly and conveniently checked, controlled and improved by adopting the water immersion type structure. For example, taking out and weighing a single anode can accurately calculate the service life of the anode, thereby providing a basis for subsequent monitoring and improvement.
The device has the advantages of simple construction, low material cost, small occupied area and environmental friendliness. The resistance reducing effect is obvious in the aspect of reducing the resistance, the dynamic adjustment can be carried out according to the conditions after construction, for example, the increase and decrease of the anode, the addition of the resistance reducing agent and the addition of the corrosion inhibitor, the adjustment of the ion concentration in the pool and pit mixture can be carried out through the control of water, and the like, and the method has obvious superiority compared with other resistance reducing modes.
The number and the arrangement of the equipment can be adjusted according to the engineering condition, the design is flexible, and the equipment is not limited.
According to the method, the anode is conveniently accessed and controlled, data of corrosion potential are conveniently acquired, and over protection, under protection and the like can be prevented through the arrangement of the test pile.
The sacrificial anode in the present disclosure will also enable the draining of stray interference currents within the station, preventing corrosion thereof.
Example two
The second embodiment of the disclosure provides a method for protecting and reducing resistance of a power station grounding network after being immersed in water and immersed in the water, which is completed based on the device for protecting and reducing resistance of the power station grounding network provided by the first embodiment, and comprises the following steps:
step S01: determining a qualified grounding resistance value in a grounding grid;
in combination with the record in GB50065 plus 2011 ground design Specification for grounding of AC electrical devices, the ground resistance of the grounding grid of the effective grounding system should conform to
(where I represents the maximum in-ground short circuit current of the grounded grid). When the grounding resistance does not meet the requirement of the formula, the grounding resistance can be properly increased through technical economy, the ground potential of a grounding network can be increased to 5000V, and R is less than or equal to 5000/I.
Step S02: calculating the grounding resistance value R in the cathode protection resistance reducing device according to the determined qualified grounding resistance valueo；
Ground resistance R in resistance-reducing rear system deviceDescend＝1/(1/ROriginal source+C/Ro) To satisfy the determined acceptable ground resistance value. Wherein C represents the number of systems to be installed according to the field; rOriginal sourceShowing the ground resistance of the grounding grid before the resistance reduction is implemented.
Step S03: and in combination with field conditions, the cathode protection resistance reduction of the device is realized by adding a resistance reducing agent, increasing the number of anodes and other measures, and the grounding resistance value in the device is reduced.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The utility model provides a power station grounding grid water logging protects to fall hinders device which characterized in that includes:
the resistance reducing unit is used for shunting current of a power station grounding grid and comprises a plurality of serially connected sacrificial anodes arranged in a water immersion manner;
the test unit is used for collecting the state data of the sacrificial anode and calculating the number of the sacrificial anodes required in the resistance reducing unit and the service life of the sacrificial anodes;
and the cable unit is used for connecting the resistance reducing unit and the testing unit.
2. The power station grounding grid water immersion protection and resistance reduction device as claimed in claim 1, characterized in that the power station grounding grid water immersion protection and resistance reduction device further comprises a pool pit, which is arranged at a distance of 1-2 m from the periphery of the grounding grid, the minimum length is set to 2m, the minimum width is set to 1.5m, and the depth is set to the buried depth of the grounding body plus 20 cm.
3. The power station grounding grid water immersion and water immersion resistance reduction device as claimed in claim 2, wherein the periphery of the pool pit is built by bricks, a space of half bricks is reserved between the bricks on the same layer around the pool pit from the pool bottom to half depth, and the upper and lower layers are arranged in a cross way so as to reserve a water seepage hole; and sealing the periphery of the pool pit from the half depth of the pool bottom to the top of the pool pit by using cement.
4. The power station grounding grid water immersion negative resistance-reducing device as claimed in claim 1, characterized in that the power station grounding grid water immersion negative resistance-reducing device further comprises a bottom material, wherein the bottom material is composed of petroleum coke, graphite powder, bentonite and corrosion inhibitor according to a ratio of 16:8:20:1, the petroleum coke, the graphite powder, the bentonite and the corrosion inhibitor are dry-mixed and then mixed with water, the mixture is uniformly put into the bottom of the pool, and the thickness of the bottom material is set to be 20 cm.
5. The power station grounding grid water immersion negative resistance-reduction device as claimed in claim 1, characterized in that said resistance-reduction unit employs a plurality of magnesium-based sacrificial anodes connected in series; the specification of the magnesium-based sacrificial anode is set to 700 x (100+120) x 102mm, and the net weight is set to 14.0 kg.
6. The power station grounding grid water immersion protection and resistance reduction device as claimed in claim 1, wherein the sacrificial anode is buried horizontally.
7. The power station grounding grid water immersion cathode protection resistance reducing device as claimed in claim 1, characterized in that the generating current of the sacrificial anode depends on the driving potential and the grounding resistance of the single sacrificial anode, and the lifetime of the sacrificial anode depends on the net weight, the consumption rate, the effective utilization factor and the average generating current of the single sacrificial anode.
8. The power station grounding grid water immersion resistance reducing device as claimed in claim 1, further comprising a cover plate disposed on the top cover of the pit.
9. The power station grounding grid water immersion and resistance reduction device as claimed in claim 8, wherein the cover plate is made of cement or tempered glass with anti-collision rubber at the edge.
10. A method for protecting and reducing resistance of a power station grounding network after being immersed in water and the negative, which adopts the device for protecting and reducing resistance of the power station grounding network after being immersed in water and the negative of any one of claims 1 to 9, is characterized by comprising the following steps:
obtaining the maximum grounding short-circuit current of the grounding grid through the test unit, and determining a qualified grounding resistance value in the grounding grid;
calculating the grounding resistance value required by the cathode protection resistance reduction device according to the determined qualified grounding resistance value;
the grounding resistance value of a single resistance reducing unit is reduced by adding a resistance reducing agent and increasing the number of sacrificial anodes.
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| CN109097782A (en) * | 2018-10-24 | 2018-12-28 | 王宝强 | A kind of spiral ground pile anti-corrosion protection system and its application method |
| US20200017977A1 (en) * | 2016-09-22 | 2020-01-16 | Vetco Gray Scandinavia As | Real-time cathodic protection integrity monitoring sensor, system and method |
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| CN101914773A (en) * | 2010-07-02 | 2010-12-15 | 边耀维 | Method and device for protecting power facility grounding net |
| CN202629361U (en) * | 2012-06-28 | 2012-12-26 | 邢士波 | Embedded type prestress steel cylinder concrete pipe with built-in zinc bar sacrificial anode |
| CN104846381A (en) * | 2015-03-30 | 2015-08-19 | 国家电网公司 | Cathode protection simulation method of sacrificial anode |
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