CN110299223B - Composite return line - Google Patents
Composite return line Download PDFInfo
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- CN110299223B CN110299223B CN201810246309.7A CN201810246309A CN110299223B CN 110299223 B CN110299223 B CN 110299223B CN 201810246309 A CN201810246309 A CN 201810246309A CN 110299223 B CN110299223 B CN 110299223B
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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
- H01B7/0258—Disposition of insulation comprising one or more longitudinal lapped layers of insulation
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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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1875—Multi-layer sheaths
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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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/24—Devices affording localised protection against mechanical force or pressure
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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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
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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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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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
- H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks
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Abstract
The invention provides a composite return line, which sequentially comprises the following components from inside to outside along the radial direction: backflow wire, main insulation and oversheath still include: low voltage supply lines and/or communication lines; the composite return line is provided with a power taking port at a position needing power supply; the composite return line provides power for an online monitoring device matched with the cable for use through the low-voltage power supply line and the power taking port; the composite return line is provided with a conversion interface at a port needing to provide information and signal transmission of an online monitoring device matched with the cable; the composite return line provides signal and information transmission for an online monitoring device matched with the cable through the communication line and the conversion interface. The invention integrates the functions of providing power supply and communication on the basis of being used as the outer metal sheath induced current return wire of the single-core cable, combines the return ground wire, the power supply wire and the communication wire into a whole, reduces the engineering cost and solves the problems of monitoring the power supply and communication of a power cable network.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to a composite return line.
Background
The return line is defined in the specification of electric power engineering cable design (GB 50217-2007): and a conducting wire which is parallel to the high-voltage single-core cable line and is grounded at two ends so that the induced current forms a loop is arranged. The return lines are also specified in the Power Cable line operating rules (DL/T1253-2013): when the single-core cable metal shield (metal sleeve) is in single-point interconnection grounding, in order to inhibit the influence of a magnetic field formed by single-phase grounding fault current on the outside and reduce the induced voltage on the metal shield (metal sleeve), grounding wires with lower impedance are laid in parallel along a cable line. (Note: the reflow line is typically provided with an insulating layer).
When the power frequency or impact induced voltage possibly occurring in the single-core cable of 110kV or above exceeds the tolerance strength of the cable sheath insulation or the electrical interference strength to the weak current circuit adjacent to the cable needs to be restrained, the grounding return line should be arranged along the cable. The role of the return line is twofold: on one hand, the power frequency induction voltage generated by a cable metal layer during the short circuit of the system is limited, the power frequency induction voltage is prevented from exceeding the insulation tolerance strength of a cable sheath or the power frequency withstand voltage of a sheath voltage limiter, and on the other hand, the electric interference strength of a cable adjacent to a weak current circuit is inhibited. Therefore, in order to protect a high-voltage cable line, a return line is usually added to reduce induced voltage generated by an electromagnetic field effect, so as to avoid current breakdown accidents caused by excessively strong induced current passing through a metal protection layer.
For engineering application convenience, avoiding secondary wiring, developing a photoelectric composite cable by cable manufacturing and production units, combining the cable and a communication optical cable together, but the technology is not suitable for high-voltage single-core cables; in the second aspect, in the existing cable on-line monitoring technology, the cable itself or the return line, etc. cannot provide a monitoring power supply or a communication means for the monitoring device, and the monitoring device needs to be provided with a power supply to provide power for the cable monitoring device or the communication device; in addition, the communication transmission of the monitoring data of the high-voltage cable needs to adopt a wired or wireless mode, and if an efficient and accurate optical cable communication means is selected, an optical cable needs to be additionally laid, so that manpower and material resources are wasted.
Disclosure of Invention
In view of the deficiencies in the prior art, the present invention provides a composite return line that solves some or all of the problems noted in the background section.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a composite return wire, which is used for a high-voltage single-core cable, and the composite return wire sequentially comprises the following components from inside to outside along the radial direction: backflow wire, main insulation and oversheath, the main insulation is closely wrapped up in backflow wire's the outside plays insulating role, the oversheath is closely wrapped up in the main insulation outside plays mechanical protection, waterproof, fire-retardant effect, still includes: a low voltage supply line and/or a communication line, the low voltage supply line being twisted with the return conductor, arranged parallel inside the main insulation; the communication wire and the return conductor are twisted and arranged inside the main insulation in parallel;
when a low-voltage power supply line is arranged in the composite return line, the composite return line is provided with a power taking port at a position needing power supply; the composite return line provides power for an online monitoring device matched with the cable for use through the low-voltage power supply line and the power taking port;
when a communication line is arranged in the composite return line, a conversion interface is arranged at a port of an online monitoring device matched with the cable for use, which needs to provide information and signal transmission; the composite return line provides signal and information transmission for an online monitoring device matched with the cable through the communication line and the conversion interface;
work as when being provided with low pressure power supply line and communication line in the compound return current line simultaneously, the low pressure power supply line with the communication line and return current wire three transposition, arrange parallelly the main insulation is inboard, just compound return current line is provided with the mouth of getting electricity in the department of need supplying power to and be provided with the conversion interface in the port department that needs provide information and signal transmission with the supporting online monitoring device who uses of cable.
Further, the low-voltage power supply line is a direct-current power supply line or an alternating-current power supply line, and the low-voltage power supply line is used for providing direct-current or alternating-current, single-phase or three-phase power supply.
Further, the communication line is a coaxial line, a twisted line or an optical cable.
Furthermore, the optical cable consists of an optical cable center reinforcing member, an optical fiber, water-blocking filling paste and an optical cable sheath.
Further, the outer sheath is made of a waterproof flame-retardant insulating material with high mechanical strength.
Further, the outer sheath is a halogen-free low-smoke flame-retardant polyolefin sheath.
Further, the composite return line further comprises: a filler;
when a low-voltage power supply line is arranged in the composite return wire, the filler is filled among the return wire, the low-voltage power supply line and the inner side of the main insulation;
when the composite return line is provided with a communication line, the filler is filled among the return lead, the communication line and the inner side of the main insulation;
when be provided with low voltage power supply line and communication line simultaneously in the compound return current line, the filler is filled in return current wire, the communication line, low voltage power supply line with between the main insulation is inboard.
Further, the filler is water-blocking filling paste.
Further, the low voltage supply line comprises: power supply line sinle silk and power supply line sheath, the power supply line sheath is closely wrapped up in the power supply line sinle silk outside.
Further, the return conductor includes: a return conductor non-magnetic conductor and a return conductor jacket.
According to the technical scheme, the composite return wire provided by the invention is characterized in that the low-voltage power supply line is integrated and the power taking port is arranged on the basis of the return wire, so that the problem of a power supply source of a high-voltage long-cable online monitoring device is solved, when the high-voltage cable needs to be monitored online, a stable and continuous power supply is provided for the online monitoring device (including a communication device) on site, and the composite return wire has the characteristic of convenience in power taking. In addition, the composite return wire provided by the invention integrates the communication wire on the basis of the return wire, solves the problem of communication transmission of the monitoring data of the high-voltage cable, provides a convenient communication means for the high-voltage cable on-line monitoring device, and can avoid secondary wiring. Finally, the composite return line provided by the invention integrates the communication line on the basis of integrating the return line and the low-voltage power supply line, and solves the power supply problem of the high-voltage long-cable online monitoring device and the communication transmission problem of the high-voltage cable monitoring data. In conclusion, the composite return line provided by the invention has the effects of inhibiting induced voltage and providing power supply and data communication, and has the characteristics of convenience in power taking, high efficiency in communication and avoidance of secondary wiring. Therefore, the invention integrates the functions of providing power supply and communication on the basis of being used as the outer metal sheath induced current return wire of the single-core cable, combines the return ground wire, the power supply wire and the communication wire into a whole, reduces the engineering cost and solves the problems of monitoring the power supply and communication of a power cable network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a composite reflow line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a composite return line;
FIG. 3 is a schematic diagram of another embodiment of a composite return line;
FIG. 4 is a schematic diagram of a power supply scheme of a composite return line based power cable detection and monitoring system according to an embodiment of the present invention;
FIG. 5 is a schematic communication diagram of a composite return line based power cable detection and monitoring system according to an embodiment of the present invention;
in the above figures, the meanings of the numbers are as follows:
01 denotes a return lead; 02 denotes main insulation; 03 denotes the low-voltage supply line; 04 denotes a communication line; 05 represents a filler; 06 denotes an outer sheath; 011 denotes a return conductor non-magnetic conductor; 012 denotes a return conductor sheath; 031 denotes a supply line core; 032 denotes a power-supply-line sheath; 041 denotes a cable central strength member; 042 denotes an optical fiber; 043 represents a water-blocking filling paste; 044 denotes a cable sheath; 0421 denotes a sleeve filler; 0422 represents a cable loose tube; 100 denotes a composite return line; 101 denotes a power take-out port; 102 denotes a conversion interface; 200 denotes a partial discharge on-line monitoring device; 201 denotes a signal sensor; 202 denotes a signal processing unit; 203 denotes a display terminal; 300 denotes a three-phase high-voltage cable.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The return line is defined in the specification of electric power engineering cable design (GB 50217-2007): and a conducting wire which is parallel to the high-voltage single-core cable line and is grounded at two ends so that the induced current forms a loop is arranged. The return lines are also specified in the Power Cable line operating rules (DL/T1253-2013): when the single-core cable metal shield (metal sleeve) is in single-point interconnection grounding, in order to inhibit the influence of a magnetic field formed by single-phase grounding fault current on the outside and reduce the induced voltage on the metal shield (metal sleeve), grounding wires with lower impedance are laid in parallel along a cable line. (Note: the reflow line is typically provided with an insulating layer).
When the power frequency or impact induced voltage possibly occurring in the single-core cable of 110kV or above exceeds the tolerance strength of the cable sheath insulation or the electrical interference strength to the weak current circuit adjacent to the cable needs to be restrained, the grounding return line should be arranged along the cable. The role of the return line is twofold: on one hand, the power frequency induction voltage generated by a cable metal layer during the short circuit of the system is limited, the power frequency induction voltage is prevented from exceeding the insulation tolerance strength of a cable sheath or the power frequency withstand voltage of a sheath voltage limiter, and on the other hand, the electric interference strength of a cable adjacent to a weak current circuit is inhibited. Therefore, in order to protect a high-voltage cable line, a return line is usually added to reduce induced voltage generated by an electromagnetic field effect, so as to avoid current breakdown accidents caused by excessively strong induced current passing through a metal protection layer. The laying of the three-phase cable return line has two modes, one mode is that an equilateral triangle is laid, the return line is arranged at the gravity center of the triangle, the distances from the return line to the three-phase cable are equal, and when three-phase loads are equal, three-phase currents form 120 degrees with each other; the other is parallel laying, the return lines are arranged at the 'three-seven' opening of one phase interval, the position of the midpoint of the cable line is changed, the midpoint is taken as the boundary, the induced voltages in the return lines at two sides are equal and opposite in direction, and the voltage difference between two grounding ends of the return line is ensured to be zero.
In the existing cable on-line monitoring technology, the cable itself or the return line, etc. cannot provide a monitoring power supply or a communication means for the monitoring device, and the monitoring device needs to be provided with a power supply to provide power for the cable monitoring device or the communication device.
To solve the problem, an embodiment of the present invention provides a composite return line, which is used for a high-voltage single-core cable, and the composite return line is used for the high-voltage single-core cable and sequentially includes, from inside to outside along a radial direction: backflow wire, main insulation and oversheath, the main insulation is closely wrapped up in backflow wire's the outside plays insulating role, the oversheath is closely wrapped up in the main insulation outside plays mechanical protection, waterproof, fire-retardant effect, its characterized in that still includes: a low voltage supply line and/or a communication line, the low voltage supply line being twisted with the return conductor, arranged parallel inside the main insulation; the communication wire and the return conductor are twisted and arranged inside the main insulation in parallel;
when a low-voltage power supply line is arranged in the composite return line, the composite return line is provided with a power taking port at a position needing power supply; the composite return line provides power for an online monitoring device matched with the cable for use through the low-voltage power supply line and the power taking port;
when a communication line is arranged in the composite return line, a conversion interface is arranged at a port of an online monitoring device matched with the cable for use, which needs to provide information and signal transmission; the composite return line provides signal and information transmission for an online monitoring device matched with the cable through the communication line and the conversion interface;
work as when being provided with low pressure power supply line and communication line in the compound return current line simultaneously, the low pressure power supply line with the communication line and return current wire three transposition, arrange parallelly the main insulation is inboard, just compound return current line is provided with the mouth of getting electricity in the department of need supplying power to and be provided with the conversion interface in the port department that needs provide information and signal transmission with the supporting online monitoring device who uses of cable.
According to the technical scheme, the composite return line provided by the embodiment is characterized in that a low-voltage power supply line is integrated and an electricity taking port is arranged on the basis of the return line, so that the problem of a power supply source of a high-voltage long-cable online monitoring device is solved, when the high-voltage cable needs to be monitored online, a stable and continuous power supply is provided for the online monitoring device (including a communication device) on the spot, and the composite return line has the characteristic of convenience in electricity taking. In addition, the composite return line that this embodiment provided has assembleed the communication line on the basis of return line, has solved the communication transmission problem of high tension cable monitoring data, provides convenient means of communication for high tension cable on-line monitoring device to can avoid secondary wiring. Finally, the composite return line provided by the embodiment integrates the communication line on the basis of integrating the return line and the low-voltage power supply line, and solves the problem of a power supply source of the high-voltage long-cable online monitoring device and the problem of communication transmission of monitoring data of the high-voltage cable. To sum up, the composite return line that this embodiment provided has the effect of restraining induced voltage, providing power and data communication, and has the characteristics of getting the electricity convenient, the communication is high-efficient, avoid secondary wiring. Therefore, on the basis of being used as the single-core cable outer metal sheath induced current return wire, the power supply and communication integrated circuit integrates the functions of power supply and communication, combines the return ground wire, the power supply wire and the communication wire into a whole, reduces engineering cost, and solves the problems of power supply monitoring and communication of a power cable network.
In a preferred embodiment, the low-voltage supply line is a dc supply line or an ac supply line, and the low-voltage supply line is used to provide a dc or ac, single-phase or three-phase supply source.
In a preferred embodiment, the communication line is a coaxial line, a twisted wire or an optical cable.
In a preferred embodiment, the optical cable is comprised of a cable center strength member, an optical fiber, a water-blocking filler paste, and a cable jacket.
In a preferred embodiment, the outer sheath is composed of a waterproof flame-retardant insulating material of high mechanical strength.
In a preferred embodiment, the outer sheath is a halogen-free low-smoke flame-retardant polyolefin sheath.
In a preferred embodiment, the composite return line further comprises: a filler;
when a low-voltage power supply line is arranged in the composite return wire, the filler is filled among the return wire, the low-voltage power supply line and the inner side of the main insulation;
when the composite return line is provided with a communication line, the filler is filled among the return lead, the communication line and the inner side of the main insulation;
when be provided with low voltage power supply line and communication line simultaneously in the compound return current line, the filler is filled in return current wire, the communication line, low voltage power supply line with between the main insulation is inboard.
In a preferred embodiment, the filler is a water-blocking filler paste.
In a preferred embodiment, the low voltage supply line comprises: power supply line sinle silk and power supply line sheath, the power supply line sheath is closely wrapped up in the power supply line sinle silk outside.
In a preferred embodiment, the return conductor comprises: a return conductor non-magnetic conductor and a return conductor jacket.
It should be noted that, on the premise that logics or structures of a plurality of preferred embodiments provided in this embodiment do not conflict with each other, the preferred embodiments may be freely combined, and the present invention is not limited to this.
Three structures of the composite reflow line provided in this embodiment will be described below with reference to fig. 1 to 3.
Fig. 1 shows a schematic structural diagram of the composite return line provided in this embodiment. Referring to fig. 1, the composite reflow line provided in this embodiment includes: the low-voltage power supply line comprises a reflux lead 01, a main insulator 02, a low-voltage power supply line 03, a filler 05 and an outer sheath 06, wherein the reflux lead 01 and the low-voltage power supply line 03 are arranged in a twisted and parallel mode on the inner side of the main insulator 02, and the filler 05 is arranged between the main insulator 02 and the reflux lead 01 and between the main insulator and the low-voltage power supply line 03. In the present embodiment, the function of the return conductor 01 is: on one hand, the power frequency induction voltage generated by a cable metal layer during the short circuit of the system is limited, and the phenomenon that the power frequency induction voltage exceeds the insulation withstand strength of a cable sheath or the power frequency withstand voltage of a sheath voltage limiter is prevented; and on the other hand, the electric interference strength of the cable adjacent to the weak current line is suppressed. In this embodiment, the low voltage power supply line 03 functions to provide power, including dc or ac power, single phase or three phase power. In this embodiment, a power take-off port is provided at a place where power supply is required for the composite return line. Specifically, a power taking port is arranged on the composite return line at a position where the power needs to be supplied to an online monitoring device matched with the cable for use. The composite return line of the embodiment can provide a power supply for the online monitoring device matched with the cable through the low-voltage power supply line 03 and the power taking port. See, for example, the schematic power supply for a composite return line based power cable detection and monitoring system shown in fig. 4. In the figure, the on-line monitoring device used with the cable is a cable partial discharge on-line monitoring device 200. In the figure, the power-taking port 101 is provided near the signal processing unit 202 of the cable partial discharge on-line monitoring device 200 on the composite return line 100, and the power-taking port 101 on the composite return line 100 is connected to the cable partial discharge on-line monitoring device 200 to supply power to the signal processing unit 202 in the cable partial discharge on-line monitoring device 200. In this figure, the low voltage power supply line in the composite return line 100 is an ac power supply line, and the composite return line 100 provides ac power to the partial discharge online monitoring device 200. In the figure, 201 is a signal sensor in the cable partial discharge online monitoring device 200.
In this embodiment, the return conductor 01 includes a return conductor non-magnetic conductor 011 and a return conductor jacket 012, the return conductor jacket 012 tightly wrapping around the outside of the return conductor non-magnetic conductor 011. Low voltage power supply line 03 includes power supply line sinle silk 031 and power supply line sheath 032, and power supply line sheath 032 wraps up closely in the power supply line sinle silk 031 outside. The filler 05 is a water-blocking filler paste. The outer jacket 06 is composed of a flame-retardant insulating material of high mechanical strength. Preferably, the outer jacket 06 is a halogen-free low smoke flame retardant polyolefin jacket.
Fig. 2 shows another schematic structural diagram of the composite return line provided in the present embodiment. Referring to fig. 2, the composite reflow line provided in this embodiment includes: the cable comprises a return conductor 01, a main insulation 02, a communication line 04, a filler 05 and an outer sheath 06, wherein the return conductor 01 and the communication line 04 are arranged in a twisted and parallel mode inside the main insulation 02. The communication line 04 is used for providing signal and information communication for the on-line monitoring device of the cable. In this embodiment, a conversion interface is provided on the composite return line. Specifically, a conversion interface is arranged on the composite return line at a port of the online monitoring device matched with the cable for use, where information and signal transmission needs to be provided. The composite return line provides signal and information transmission for an online monitoring device matched with the cable through the communication line 04 and the conversion interface. For example, see fig. 5 for a communication scheme of a composite return line based power cable detection and monitoring system. In the figure, the on-line monitoring device used with the cable is a cable partial discharge on-line monitoring device 200. In the figure, a switching port 102 is provided in the vicinity of a signal processing unit 202 and a display terminal 203 of a cable partial discharge online monitoring device 200 on a composite return line 100, and the switching port 102 on the composite return line 100 is connected to the cable partial discharge online monitoring device 200 to perform communication transmission of information and signals thereof. In the figure, 201 is a signal sensor in the cable partial discharge online monitoring device 200, and 300 is a three-phase high-voltage cable.
Preferably, the communication line 04 in this embodiment is an optical cable, and further, the optical cable further includes an optical cable central strength member 041, an optical fiber 042, a water-blocking filling paste 043, and an optical cable sheath 044.
In this embodiment, the reflow conductive wire 01 includes a reflow conductive wire non-magnetic conductor 011 and a reflow conductive wire sheath 012, and the reflow conductive wire sheath 012 is tightly wrapped outside the reflow conductive wire non-magnetic conductor 011.
In this embodiment, the outer jacket 06 is made of a flame-retardant insulating material having high mechanical strength. Preferably, the outer jacket 06 is a halogen-free low smoke flame retardant polyolefin jacket.
In this embodiment, the composite return line further includes: a filler 05; the filler 05 is filled among the return lead, the communication line and the inner side of the main insulation; preferably, the filler 05 is a water-blocking filler paste having the functions of shock absorption and water blocking.
Fig. 3 shows another schematic structure diagram of the composite return line provided in the present embodiment. Referring to fig. 3, the composite reflow line provided in this embodiment includes: the low-voltage power supply system comprises a return lead 01, a main insulator 02, a low-voltage power supply line 03, a communication line 04 and an outer sheath 06 (the filler 05 is not shown in the figure), wherein the return lead 01 is arranged inside the main insulator 02 in a twisted and parallel mode with the low-voltage power supply line 03 and the communication line 04. In the present embodiment, the function of the return conductor 01 is: on one hand, the power frequency induction voltage generated by a cable metal layer during the short circuit of the system is limited, the power frequency induction voltage is prevented from exceeding the insulation tolerance strength of a cable sheath or the power frequency withstand voltage of a sheath voltage limiter, and on the other hand, the electric interference strength of a cable adjacent to a weak current circuit is inhibited. In this embodiment, the low-voltage power supply line 03 functions to supply power, including a direct-current power supply or an alternating-current power supply. In this embodiment, the communication line 04 is used for providing signal and information transmission or communication for the cable on-line monitoring device. In this embodiment, the composite return line is provided with a power-taking port at a position where power supply is required; the composite return line provides power for an online monitoring device matched with the cable through the low-voltage power supply line 03 and the power taking port; the composite return line is provided with a conversion interface at a port needing to provide information and signal transmission of an online monitoring device matched with the cable; the composite return line provides signal and information transmission for an online monitoring device matched with the cable through the communication line 04 and the conversion interface.
In this embodiment, low voltage power supply line 03 includes power supply line core 031 and power supply line jacket 032, and power supply line jacket 032 wraps up closely outside power supply line core 031. In this embodiment, the communication line 04 is preferably an optical cable, where the optical cable is an optical cable suitable for on-line monitoring signal transmission of the optical cable, and the optical cable consists of an optical cable central strength member 041, an optical fiber 042, a sleeve filler 0421, an optical cable loose sleeve 0422, a water-blocking filling paste 043, and an optical cable sheath 044. In the present embodiment, the outer sheath 06 is composed of a flame-retardant insulating material of high mechanical strength; preferably, the outer jacket 06 is a halogen-free low smoke flame retardant polyolefin jacket.
As can be seen from the above description, the composite return line provided by this embodiment has a reasonable structural arrangement, and on the basis of the return line, the power line and/or the communication line are integrated, and the power-taking port is provided, so that the problem of the power supply of the high-voltage long-cable online monitoring device is solved, when the high-voltage cable needs to be monitored online, a stable and continuous power supply is provided for the online monitoring device and/or the communication device on the spot, and the composite return line has the characteristic of convenient power-taking. In addition, the compound return line that this embodiment provided has solved the communication transmission problem of high tension cable monitoring data, provides high-efficient, accurate communication means for high tension cable on-line monitoring technique to avoid secondary wiring. To sum up, the compound return line that this embodiment provided has the effect of restraining induced voltage, providing monitoring power and signal communication, has concurrently simultaneously to get the advantage that the electricity is convenient, the communication is high-efficient, avoid secondary wiring.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a compound return wire for high pressure single core cable, compound return wire includes from inside to outside in proper order along radial direction: backflow wire, main insulation and oversheath, the main insulation is closely wrapped up in backflow wire's the outside plays insulating role, the oversheath is closely wrapped up in the main insulation outside plays mechanical protection, waterproof, fire-retardant effect, its characterized in that still includes: a low voltage supply line and/or a communication line, the low voltage supply line being twisted with the return conductor, arranged parallel inside the main insulation; the communication wire and the return conductor are twisted and arranged inside the main insulation in parallel;
when a low-voltage power supply line is arranged in the composite return line, the composite return line is provided with a power taking port at a position needing power supply; the composite return line provides power for an online monitoring device matched with the cable for use through the low-voltage power supply line and the power taking port;
when a communication line is arranged in the composite return line, a conversion interface is arranged at a port of an online monitoring device matched with the cable for use, which needs to provide information and signal transmission; the composite return line provides signal and information transmission for an online monitoring device matched with the cable through the communication line and the conversion interface;
when the composite return wire is simultaneously provided with a low-voltage power supply wire and a communication wire, the low-voltage power supply wire, the communication wire and the return wire are twisted and arranged on the inner side of the main insulation in parallel, the composite return wire is provided with a power taking port at a position needing power supply, and a conversion interface is arranged at a port, needing information providing and signal transmission, of an online monitoring device matched with a cable;
wherein the composite return line further comprises: a filler;
when a low-voltage power supply line is arranged in the composite return wire, the filler is filled among the return wire, the low-voltage power supply line and the inner side of the main insulation;
when be provided with low voltage power supply line and communication line simultaneously in the compound return current line, the filler is filled in return current wire, the communication line, low voltage power supply line with between the main insulation is inboard.
2. The composite return line according to claim 1, wherein the low-voltage power supply line is a dc power supply line or an ac power supply line, and the low-voltage power supply line is configured to supply a dc or ac power supply.
3. The composite return line of claim 1, wherein the communication line is a coaxial line, a stranded wire, or an optical cable.
4. The composite return line of claim 3, wherein the fiber optic cable is comprised of a cable center strength member, an optical fiber, a water-blocking filler paste, and a cable jacket.
5. The composite return line of claim 1, wherein the outer jacket is comprised of a high mechanical strength, waterproof, flame retardant, insulative material.
6. The composite return line of claim 5, wherein the outer jacket is a halogen-free, low-smoke, flame-retardant polyolefin jacket.
7. The composite reflow line of claim 1, wherein the filler is a water-blocking filler paste.
8. The composite return line of claim 1, wherein the low voltage supply line comprises: power supply line sinle silk and power supply line sheath, the power supply line sheath is closely wrapped up in the power supply line sinle silk outside.
9. The composite reflow line of claim 1, wherein the reflow wire includes: a return conductor non-magnetic conductor and a return conductor jacket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810246309.7A CN110299223B (en) | 2018-03-23 | 2018-03-23 | Composite return line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810246309.7A CN110299223B (en) | 2018-03-23 | 2018-03-23 | Composite return line |
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| Publication Number | Publication Date |
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| CN110299223A CN110299223A (en) | 2019-10-01 |
| CN110299223B true CN110299223B (en) | 2020-11-10 |
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| CN201810246309.7A Active CN110299223B (en) | 2018-03-23 | 2018-03-23 | Composite return line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000243153A (en) * | 1999-02-16 | 2000-09-08 | Kiyoshige Suekane | Earth center cable |
| CN2727910Y (en) * | 2004-03-18 | 2005-09-21 | 江苏通光信息有限公司 | Photoelectric composite aerial earth wire |
| CN2708451Y (en) * | 2004-03-18 | 2005-07-06 | 江苏通光信息有限公司 | An aerial earth wire containing insulated conductor |
| CN205230622U (en) * | 2015-12-16 | 2016-05-11 | 中天科技海缆有限公司 | Network system is joined in marriage with compound flexible direct current medium voltage cable of positive negative pole unification optic fibre in city |
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Effective date of registration: 20230918 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Sinopec (Dalian) Petrochemical Research Institute Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC Corp. |
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