• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SU723001A1
    申请号:SU772500701
    申请日:1977-06-30
    公开日:1980-03-25
    发明作者:Полак Йозеф；Боубела Лубомир；Мразек Йозеф
    申请人:Хемопроект, Проектова, Инженырска А Конзултачни Организаце(Инопредприятие)；
    IPC主号:
    专利说明:

    ground measuring unit 6 with terminals A, B, C, O E, F, G and N.
    Catalytically protected pipeline 1 is connected to terminal A of measuring unit 6 by means of a galvanic connection, for example cable 7, which is connected to terminal JQ of measuring unit 6 by another galvanic connection 8. Pipeline 5, which is also influenced by scattering current, is also insulated A galvanic connection, such as a cable 9, is connected to the terminal B of the measuring unit 6. A metal auxiliary electrode 11 is connected to the terminal E of the measuring unit 6 by means of a galvanic connection 10 and disposed in the ground at a depth of the longitudinal axes are luminant current under the influence of the scattering line 5 at a distance of 0.3-5 m in place of mating pipes 5 and 1.
    To terminal C of measurement unit 6 by means of galvanic connection
    12 connect reference electrode
    13 sensors, for example Co / CuSO. Electrodes 11 and 13 can be used independently. Comparison electrode 13 can be placed above the ground above the crossing point of pipelines 1 and 5, a positive pole is connected to terminal F of measuring unit 6, and a negative pole of milliammeter 14 is connected to terminal E between terminals A and G in a series circuit, with one side, variable resistance 15 and, on the other hand, the switch Id. Terminals
    F and E are connected by a galvanic connection 17, and terminals B and G are connected by a galvanic connection 18.
    An ohmmeter 19 is connected to a milliammeter 14 in a parallel circuit. In measuring zones 1 and II, a high-resistance recording voltmeter 20 or ammeter 21 is connected. Terminals D and E of the measuring unit are connected by a galvanic connection 22
    The dissipation current with the cathode protection station on is measured using a milliammeter 14, namely on one side with the switch 16 turned on and on the other when the switch 16 is turned off. At the same time, the variable resistance 15 is set so that a zero dissipation current passes. Interference fusion, i.e.
    The galvanic section of the current is realized in the unit .PI 6 by galvanic connection between terminals B-6-A, including the variable resistance 15 and the switch 16. If the conduit 5 as a result of stray currents is influenced by direct-current electrified rail transport, the anode 3 is under the authority of the current-collecting roller, at the crossing point of the affected pipeline 5 there is an anode zone, and the influencing pipeline 1 has a cathode zone, In the measuring zone W corresponds to the terminal F of the block The measurement pole is connected to the positive pole of the recording milliammeter 14, while the negative pole is connected to terminal E. In the measurement zone 1, the positive pole of high-resistance recording voltmeter 20 is connected to terminal C of measurement unit 6 and the negative pole is connected to terminal B. Instead of a cathodic protection station, in this case, the piping 1 and 5 are affected by dynamic stray currents. Since the galvanic currents in this case can not be taken into account, the dissipation current is measured for several hours using a recording milliammeter 14 on the one hand when the switch 16 is turned on and on the other hand when the switch 16 is turned off. the selected time interval so that the average value of the current flowing through the recording milliammeter in the selected time interval remains zero. At the same time, the potential of the system to be influenced by the structure (ground relative to the Cu / CoSO - reference electrode) is measured by a high-resistance recording voltmeter 20.
    权利要求:
    Claims (1)
    [1]
    When evaluating the measurement results at a selected time interval, the average zero value of the current passing through the recording ammeter correlates with the average potential value. The zero value of the total current after measurements in the ground for various conditions corresponds to a potential value of from –0.75 to –0.80 in relative Cu / Co SO –electric comparison. If the magnitude of the potential becomes more negative than -O, 80b, then the structure is already partially protected by J valid. It is desirable to somewhat reduce the value of the ohmic resistance of the galvanic section of the current, i.e. make an interference connection in order to avoid the anode section in the pipeline 5. However, it is necessary to carry out a comprehensive measurement of the mode of operation of various possible sources of stray scattering currents. FIG. 3 solid lines show the galvanic sections of current through the metal, and the dashed lines show the electric sections of current through the electrolyte, i.e. across the land. The nodal point 23 is the maximum threat point of the affected current of the dispersal current of the pipeline 5. The nodal point 24 represents the maximum reception point of the dissipation current from the nodal point 23 on the protected inflow pipe 1. At the nodal point 24, the protective current also from the anode 3 by means of an electrolytic section of current 25. The influence of the current dissipated in the electrolytic section of the current of bridge 26 from the nodal point 23 to the nodal point 24 is the sum of all currents, except for the current that passes to the nodal Point 24 through the metal auxiliary electrode 1 Between the nodal points 23 and 24 is in the electrolyte the least resistance 27. This is a self-contractual earth resistance of the system that is influenced by the pipeline 5-electrolyte and the influence pipe 1. Resistance 28 there is a grounding resistance of the system, the affected pipeline 5 is an electrolyte, and resistance 29 is a grounding resistance of the system, the influencing pipeline 1 is an electrolyte. Resistance 30 is the grounding resistance of the system of the metal auxiliary electrode 11-electrolyte conduit 1. In this branch of the bridge circuit, a dissipation current flows from the nodal point 31, which is a metal auxiliary electrode 11, through the electrolyte to the nodal point 24. Simultaneously This leads to the imposition of a galvanic current in a galvanic cell, which results from the polarized surfaces at the nodal points 31 and 23 after the attachment of the metal auxiliary the lien electrode And and the affected pipe 16 by means of cables 9 and 10. The surface of the auxiliary electrode 11 is always 1.5-2 times less than the surface of the bare metal at the site of damage of the insulating coating of the affected current of the scattered pipeline 5. The circuit is practically This effect affects the ratio of the currents between the nodal points 23 and 24 and in the current section 25. After the variable resistance 15 is set to the proper value and after the switch 16 is turned on, the current flow is dissipated in the current section 26 and The current from the nodal point 31 to the nodal point 24 to the zero value is possible after a new variable resistor is set to a smaller value. The direction of the current is reversed, so that the pipeline 5 and the auxiliary electrode 11 are partially cathodically protected, since with a parallel circuit, there is an identical voltage at both resistances 27 and 30 and the flowing current is inversely dependent on grounding resistances 27 and 30. After switching on the switch 16, a new galvanic current is applied, which is formed by a galvanic cell caused by different polarized surfaces at the nodal points 31 and 24 after the galvanic connection of the auxiliary electrode 11 and the protected pipeline 1. Consequently, in the measurement zone III with a millimeter meter 14 measure the amount of current A where a is the dissipation current: Zr is the galvanic current passing between pipe 5 and the metal auxiliary electrode 11; 3 „,,. The lvanic current applied by pipeline 1 and the metal auxiliary electrode 11. After the measurements have been made, the values of the polarization potential usually vary within the following limits. Steel surface O of the influencing pipeline 1 UQ (inclusive) from -O, 80 to-1.10 in. The steel surface, P, of the affected pipeline is 5 Up (off) from –50 to –0.75 in. The steel surface Q of the metal auxiliary electrode llUq (off) is from -0.70 to 1.00 volts. , The values for UQ (off) -0.90v, p (off) - - Oj60 in and DO (off,) 0.75 in the galvanic current becomes zero, which according to equation (f) will be l ((.) (.) J Jpo-Vr G Poo "po (-0.60 + 0.75 + 0.75 - 0.90) Oh, if RpQ ROQ, where RPQ is the grounding resistance through the electrolyte of the system, pipeline 5-auxiliary electrode And ground The resistance of the system is pipeline 1 - an auxiliary electrode 11. Claims of the invention The method is protected against corrosion of stretched metal structures in the area of stray currents, including the period .ISf
    P "g / base measurement of electric parpovmot and its regulation, characterized in that, with the insight of the influence of stray currents flowing from a cathodically protected structure to neighboring unprotected structures, by diverting current from jiax by means of a galvanic section, the current in the ground at the depth of the longitudinal axis of the unprotected structure at the crossing of both structures, an auxiliary electrode is installed; between the protected and unprotected structures, an alternating resistance is turned on, the current between the auxiliary electrodes is measured ektrodom and vulnerable structure and alter the resistance value variable up until the current value becomes equal to "" ulyu. Sources of information taken into account njiH expertise 1. USSR author's certificate number 2O3425, cl. C 23 F 13 / GS, 1965.
    Jl
    J
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    If / E
    1715
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    FIG. 2
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    同族专利:
    公开号 | 公开日
    GB1589241A|1981-05-07|
    GB1589244A|1981-05-07|
    US4152228A|1979-05-01|
    CS182743B1|1978-05-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2943027A|1957-10-09|1960-06-28|Pure Oil Co|Method and apparatus for determining current density|
    CS199051B1|1975-04-28|1980-07-31|Josef Polak|Method of polarizing potential measuring of constructions from carbon steel placed in electrolyte in electric current field and device for making this method|US4489277A|1982-01-04|1984-12-18|Shell Oil Company|Cathodic protection monitoring system|
    IT215064Z2|1988-10-14|1990-07-30|Il Gas S P A Soc It|EQUIPMENT FOR INSULATION CONTROL AND CATHODIC PROTECTION OF UNDERGROUND METAL PIPES|
    DE8912203U1|1989-10-13|1990-01-04|Korupp, Waldemar, 4477 Twist, De|
    US5216370A|1991-10-24|1993-06-01|Corrpro Companies, Inc.|Method and system for measuring the polarized potential of a cathodically protected structures substantially IR drop free|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CS7600006147A|CS182743B1|1976-09-22|1976-09-22|Method for removal or decrease of interference at metal constructions buried in electrolyte in etraneous direct current field and connexion for making the said method|
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