CN105427927A - Reactor outside nuclear measurement system double-ground separation method - Google Patents
Reactor outside nuclear measurement system double-ground separation method Download PDFInfo
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- CN105427927A CN105427927A CN201510764134.5A CN201510764134A CN105427927A CN 105427927 A CN105427927 A CN 105427927A CN 201510764134 A CN201510764134 A CN 201510764134A CN 105427927 A CN105427927 A CN 105427927A
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- cable
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- coaxial
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1895—Particular features or applications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0216—Two layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0064—Earth or grounding circuit
Abstract
The present invention relates to the technical field of nuclear and provides a reactor outside nuclear measurement system double-ground separation method, and the separation of a nuclear detector signal ground and a protection ground is realized. According to the method, a double-layer shielded coaxial cable is used to transmit a nuclear detector signal, a coaxial cable with two layers of insulating shielding layers is used to substitute a conventional single-layer shield shielding cable to be a signal transmission cable, the problem of easy electromagnetic interference in the reactor outside nuclear measurement system signal transmission process is solved effectively, and the system reliability is improved. At the same time, the method also can be used in other occasions with the need of using a coaxial cable to transmit a weak signal.
Description
Technical field
The present invention relates to nuclear technology field, particularly a kind of method that is separated of out-pile nuclear measurement system, realizes nuclear detector signal ground and is separated with protecting field twoly.
Background technology
Neutron fluence rate monitoring when out-pile nuclear measurement system is mainly used in reactor from shutdown to 200% Operation at full power around reactor.Neutron fluence rate is measured by arranging a series of neutron detection device around reactor pressure vessel, the change of continuous monitoring reactor capability, power level and reactor Axial power difference, and related measurement data and alarm signal are passed to RPS and other system.The detector that out-pile nuclear measurement system uses comprises three kinds of neutron detectors such as being coated with boron proportional counter tube, gamma compensated ionization chamber, more piece ionization chamber.Because detector is positioned at nuclear power plant containment shell, during reactor operation, this area radiation dose rate is far above the acceptable scope of personnel, directly cannot carry out inspection and maintenance, therefore common way carries out amplification process again after utilizing coaxial cable to export the lower region of containment external radiation dose rate to the weak signal that detector produces.The advantage done like this is that electronic system is positioned at outside containment, conveniently patrols at any time, overhauls.Meanwhile, form because detector mostly is inorganic material, after being separated with electronics equipment, can work under wider temperature range.But what produce due to nuclear radiation detector mostly is weak signal, during long-distance transmissions, is easy to the interference being subject to external electromagnetic environment.Current nuclear measurement system Signal transmissions is by coaxial cable core wire transmission voltage, current signal etc. substantially, and cable shielding mesh is signal with reference to earth-return.So just using cable outer layer as signal ground; what adopt when detector end is the armored coaxial cable of stainless steel casing; signal ground is directly exposed in atmospheric environment especially; directly contact with other metal parts in containment; these metal partss belong to casing protecting field on electronics; therefore just cause the phenomenon of signal ground, protecting field hybrid junction, flow to disturbance current safely by flowing into the signal ground of detector by casing, severe jamming is caused to measurement.Although some users adopt high temperature gummed tape to wrap up armoured cable skin at present, but electromagnetic interference is by means of only directly contacting interference use equipment, simultaneously also by conducted interference equipment, as some large electric appliances equipment opening, stop the stage and all can send stronger electromagnetic wave, the coaxial outer that these electromagnetic waves can be connected between detector with electronics device generates a large amount of interference charge signals, if these electric charges can not be led away rapidly, reference potential will be made to change, interference electronics measurement result.And the detector that core is measured and signal transacting rack distance are all more than rice up to a hundred; the path of cable process on the way there are the strong electromagnetic sources such as a lot of large-size machine, electromagnetically operated valve; and various electric wire, cable; if cable routing is improper; or when having large-size machine to start; measurement result is very easily interfered, and reactor even can be caused to fall power and the pernicious consequence such as even to shut down.Therefore, how to weaken or eliminate the electromagnetic interference of outer bound pair core measuring-signal, be the difficult problem that nuclear power runs industry always.
Summary of the invention
The object of the invention is to for the problems referred to above with not enough, a kind of method providing out-pile nuclear measurement system to be separated, efficiently solves the difficult problem being easily subject to electromagnetic interference in out-pile nuclear measurement system signals transmission, improves the reliability of system twoly.Meanwhile, the method also can be used for other occasion needing to adopt co-axial cables transport weak signal.
For achieving the above object, the present invention adopts following technical scheme.
A kind of method that out-pile nuclear measurement system is separated twoly, adopt double-layer shielding coaxial-cable transmission nuclear detector signal, namely adopt the coaxial cable with two-layer insulation screen to replace conventional single-layer shield cable as signal-transmitting cable, the method comprises the following steps:
(1) at detector end, using probe body as signal ground, be connected with double-layer shielding coaxial-cable internal shield, using the supporting body metal shell of detector periphery as protecting field, be connected with double-layer shielding coaxial-cable outer shielding layer, ensure electric insulation between detector and supporting body metal shell simultaneously;
(2) at signal processing apparatus end, double-layer shielding coaxial-cable internal shield is connected with the signal ground in signal processing apparatus circuit board, the metal shell of double-layer shielding coaxial-cable outer shielding layer with cabinet, rack is connected, ground connection after simultaneously making the signal ground of signal processing apparatus circuit board be connected with cabinet independent grounding or single-point.
In technique scheme, the supporting body metal shell of detector periphery and the cabinet of signal processing apparatus end, rack are all connected with the earth connection of power plant peripheral hardware, when the electrical penetration of cable penetration power plant safety shell, double-layer shielding coaxial-cable outer shielding layer is connected with the metal shell of electrical penetration.
In technique scheme, when running through the electrical penetration of power plant safety shell, the armoured cable of double layer screen can be adopted, now, the outermost stainless steel casing of cable can directly adopt metal ferrule to be connected with electrical penetration metal cabinet, the resistance to laminate of electrical penetration metal, this connected mode can simplify labyrinth when coaxcial wire armored cable runs through electrical penetration, improves the sealing property between cable and penetration piece.
And routine run through the electrical penetration of power plant safety shell time adopt single armored cable, need insulating material between cable outer layer and penetration piece, complex structure.
In technique scheme, described double-layer shielding coaxial-cable is metal armouring form, or organic insulation form, can also be add insulating barrier outward at individual layer coaxial cable, and the insulating barrier of interpolation adopts the form of metal catheter, metal tape or wire netting.
In technique scheme, conveniently adopt commercially available single coaxial connector, the connection of described cable outer layer screen and cabinet metal shell can be by outer screen strip cable end face one segment distance, make outer screen and internal layer screen distant after, on outer screen, adopt cutting ferrule or fixture to connect a wire again, the wire other end adopts binding post with cabinet metal shell, the mode of screwed hole is connected, and the wire other end or employing metal buckle are connected with cabinet metal shell.
In technique scheme, described cable outer layer screen also can adopt the two coaxial connectors mated with two coaxial cable to be connected with the connection of cabinet metal shell, on the supporting body of detector periphery, now set up a pair of coaxial connector adapter, only single coaxial cable is adopted between detector and adapter, adapter metal shell is connected with supporting body, to guarantee electric insulation between detector housing and supporting body.
The method that a kind of out-pile nuclear measurement system provided by the invention is separated twoly, effectively can solve the weak signal of out-pile nuclear measurement system detector output when outwards transmitting, due to cable signal be subject to outside electromagnetic interference and make the difficult problem of measurement result distortion, improve antijamming capability during weak signal long-distance transmissions.After adopting this method, the cable between detector and signal transacting cabinet will significantly reduce by extraneous interference, lay path and more easily select.During cable laying, when especially the armoured cable of stainless steel casing lays, cable can be not be used in and be wound around high-temperature insulation adhesive tape outward.Meanwhile, owing to being electric insulation between cable outer layer screen and signal ground, when therefore laying, outer screen bare metal part deliberately need not evade other metal object in factory building.In addition, this method is also applicable to other to be needed to adopt coaxial cable to carry out the equipment of remote transmission signal, or originally cannot lay the occasion of weak signal cable.
Accompanying drawing explanation
Fig. 1 is that in the present invention, detector end adopts double-layer shielding coaxial-cable to realize a kind of embodiment be separated twoly.
Fig. 2 is that in the present invention, signal processing apparatus end adopts double-layer shielding coaxial-cable to realize a kind of embodiment be separated twoly.
Fig. 3 is a kind of embodiment that in the present invention, electrical penetration adopts double-layer shielding coaxial-cable to run through.
Fig. 4 is a kind of embodiment of whole detection system each parts electrical connection in the present invention.
Wherein: 1. supporting body, 2. neutron slowing-down material, 3. detector, 4. double-layer shielding coaxial-cable internal shield, 5. insulating barrier, 6. metal fixed cover, 7. double-layer shielding coaxial-cable outer shielding layer, 8. double-layer shielding coaxial-cable insulation crust, 9. metallic ground cover, 10. earth lead, 11. metal connectors, 12. hold-down screws, 13. insulating cases, 14. insulation cushions, 15. earthing rods, 16. cable shield cylinders, 17. double-layer shielding coaxial-cable heart yearns, 18. signal input parts, 19. circuit boards, 20. signal grounds, 21. cabinet metal shells, 22. armouring double-layer shielding coaxial-cable stainless steel casings, 23. metal ferrules, 24. bodies of wall, 25. electrical penetration metal cabinets, the resistance to laminate of 26. electrical penetration metal.
Embodiment
Be described in detail with reference to accompanying drawing below in conjunction with case study on implementation, to object of the present invention, feature and advantage carry out more deep understanding.
The method that a kind of out-pile nuclear measurement system of the present invention is separated twoly, adopt double-layer shielding coaxial-cable transmission nuclear detector signal, the coaxial cable with two-layer insulation screen is adopted to replace conventional single-layer shield cable as signal-transmitting cable, at detector end, using probe body as signal ground, be connected with double-layer shielding coaxial-cable internal shield, using the supporting body metal shell of detector periphery as protecting field, be connected with double-layer shielding coaxial-cable outer shielding layer, ensure electric insulation between detector and supporting body metal shell simultaneously; At signal processing apparatus end, double-layer shielding coaxial-cable internal shield is connected with the signal ground in signal processing apparatus circuit board, the metal shell of double-layer shielding coaxial-cable outer shielding layer with cabinet, rack is connected, ground connection after simultaneously making the signal ground of signal processing apparatus circuit board be connected with cabinet independent grounding or single-point.
As shown in Figure 1, be a kind of embodiment of connected mode between detector and supporting body in the present invention.Wherein, detector 3 and supporting body 1 insulate isolation by the neutron slowing-down material 2 of organic material, and to be insulated isolation by insulating barrier 5 between double-layer shielding coaxial-cable internal shield 4 and outer shielding layer 7, internal shield 4 is communicated with the metal shell of detector 3.Connected by metal fixed cover 6 between double-layer shielding coaxial-cable outer shielding layer 7 and supporting body 1 metal shell.The advantage of the method adds the metal screen layer after insulating barrier insulation at the metal screen layer skin of traditional coaxial cable; this screen protects the probe body as signal ground together with supporting body metal shell, avoids signal ground to be directly exposed in electromagnetic environment.
As shown in Figure 2, be a kind of embodiment of connected mode between double-layer shielding coaxial-cable and cabinet in the present invention.Wherein, after double-layer shielding coaxial-cable outer shielding layer is connected with earth lead 10 by metallic ground cover 9, be connected with cabinet metal shell 21 by earthing rod 15, guarantee that cable outer shielding layer and mechanical metal shell are same ground plane, simultaneously, double-layer shielding coaxial-cable outer shielding layer and metal connector 11 insulate, and double shielded coaxial cable internal shield is connected with metal connector 11.In order to prevent cable internal shield by connector and casing conducting, being insulated by the insulating case 13 around insulation cushion 14 and hold-down screw between metal connector 11 and mechanical metal shell 21 and isolating.The cable shield cylinder 16 be connected with metal connector 11 is had outside the double-layer shielding coaxial-cable heart yearn 17 be connected with the signal input part 18 on circuit board, cable shield cylinder 16 is connected with the signal ground 20 in circuit board, thus make double-layer shielding coaxial-cable internal shield and signal ground 20 form a ground plane, and mutually insulated between this ground plane and cabinet metal shell.
As shown in Figure 3, be a kind of embodiment of connected mode between double-layer shielding coaxial-cable and electrical penetration in the present invention.In order to reach the object that casing protecting field is separated with signal ground; cable through electrical penetration adopts the armouring double-layer shielding coaxial-cable having stainless steel casing, is connected between the outermost stainless steel casing of this cable 22 with the resistance to laminate 26 of electrical penetration metal by metal ferrule 23.
As shown in Figure 4, be a kind of embodiment of out-pile nuclear measurement system each several part earthing mode in the present invention.Wherein, the resistance to laminate 26 of supporting body 1, double-layer shielding coaxial-cable outer shielding layer 7, electrical penetration metal cabinet 25, electrical penetration metal and cabinet metal shell 21 mutual conduction; the protecting field of composition system; from positions such as supporting body 1 metal shell, electrical penetration metal cabinet 25 and cabinet metal shells 21 respectively by the earth connection access the earth of manufacturer, it is multipoint earthing.And detector 3 shell is by after double-shielded cable internal shield 4 is connected with the signal ground 20 on circuit board, entering greatly by cabinet termination, is single-point grounding.In the specific implementation, the earth is accessed after also cabinet metal shell 21 can being communicated with the metal cabinet loading cabinet.
Claims (6)
1. the method that is separated of an out-pile nuclear measurement system twoly, adopt double-layer shielding coaxial-cable transmission nuclear detector signal, namely adopt the coaxial cable with two-layer insulation screen to replace conventional single-layer shield cable as signal-transmitting cable, the method comprises the following steps:
(1) at detector end, using probe body as signal ground, be connected with double-layer shielding coaxial-cable internal shield, using the supporting body metal shell of detector periphery as protecting field, be connected with double-layer shielding coaxial-cable outer shielding layer, ensure electric insulation between detector and supporting body metal shell simultaneously;
(2) at signal processing apparatus end, double-layer shielding coaxial-cable internal shield is connected with the signal ground in signal processing apparatus circuit board, the metal shell of double-layer shielding coaxial-cable outer shielding layer with cabinet, rack is connected, ground connection after simultaneously making the signal ground of signal processing apparatus circuit board be connected with cabinet independent grounding or single-point.
2. the method that is separated of out-pile nuclear measurement system according to claim 1 twoly, it is characterized in that: the supporting body metal shell of detector periphery and the cabinet of signal processing apparatus end, rack are all connected with the earth connection of power plant peripheral hardware, when the electrical penetration of cable penetration power plant safety shell, double-layer shielding coaxial-cable outer shielding layer is connected with the metal shell of electrical penetration.
3. the method that is separated of out-pile nuclear measurement system according to claim 2 twoly, it is characterized in that: when running through the electrical penetration of power plant safety shell, adopt the armoured cable of double layer screen, the outermost stainless steel casing of cable directly adopts metal ferrule to be connected with electrical penetration metal cabinet, the resistance to laminate of electrical penetration metal.
4. the method that is separated of out-pile nuclear measurement system according to claim 1 twoly, it is characterized in that: described double-layer shielding coaxial-cable is metal armouring form, or organic insulation form, or adding insulating barrier outward at individual layer coaxial cable, the insulating barrier of interpolation adopts the form of metal catheter, metal tape or wire netting.
5. the method that is separated of out-pile nuclear measurement system according to claim 1 twoly, it is characterized in that: the connection of described cable outer layer screen and cabinet metal shell is by outer screen strip cable end face one segment distance, make outer screen and internal layer screen distant after, outer screen adopt cutting ferrule or fixture connect a wire, the wire other end adopts binding post with cabinet metal shell, the mode of screwed hole is connected, and the wire other end also can adopt metal buckle to be connected with cabinet metal shell.
6. the method that is separated of out-pile nuclear measurement system according to claim 1 twoly, it is characterized in that: described cable outer layer screen and the connection of cabinet metal shell adopt the two coaxial connectors mated with two coaxial cable to be connected, the supporting body of detector periphery is set up a pair of coaxial connector adapter, only adopt single coaxial cable between detector and adapter, adapter metal shell is connected with supporting body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510764134.5A CN105427927B (en) | 2015-11-11 | 2015-11-11 | A kind of out-pile nuclear measurement system detached method doublely |
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| CN201510764134.5A CN105427927B (en) | 2015-11-11 | 2015-11-11 | A kind of out-pile nuclear measurement system detached method doublely |
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| CN105427927B CN105427927B (en) | 2017-03-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057259A (en) * | 2016-04-22 | 2016-10-26 | 中国科学院上海应用物理研究所 | Reactor nuclear measurement system |
| CN112563003A (en) * | 2020-12-28 | 2021-03-26 | 宁波宁变电力科技股份有限公司 | Method for overcoming earth flashover of iron core of large-sized starting autotransformer |
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| JPH05347110A (en) * | 1990-10-11 | 1993-12-27 | Axon Cable Sa | Shielded cable forming calibration element and manufacture of the calibration element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106057259A (en) * | 2016-04-22 | 2016-10-26 | 中国科学院上海应用物理研究所 | Reactor nuclear measurement system |
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| CN112563003A (en) * | 2020-12-28 | 2021-03-26 | 宁波宁变电力科技股份有限公司 | Method for overcoming earth flashover of iron core of large-sized starting autotransformer |
| CN112563003B (en) * | 2020-12-28 | 2022-06-24 | 宁波宁变电力科技股份有限公司 | Method for overcoming earth flashover of iron core of large-sized starting autotransformer |
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| CN105427927B (en) | 2017-03-08 |
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