CN106949987B - Intelligent monitoring system and method for comprehensive pipe rack electric power cabin line replacement early warning - Google Patents
Intelligent monitoring system and method for comprehensive pipe rack electric power cabin line replacement early warning Download PDFInfo
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- CN106949987B CN106949987B CN201710220260.3A CN201710220260A CN106949987B CN 106949987 B CN106949987 B CN 106949987B CN 201710220260 A CN201710220260 A CN 201710220260A CN 106949987 B CN106949987 B CN 106949987B
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Abstract
The invention provides an intelligent monitoring system for line replacement early warning of an electric power cabin of a utility tunnel, which comprises a temperature sensing optical cable, a distributed optical fiber temperature measuring host, a controller and an upper computer; the temperature sensing optical cable is used for collecting temperature change along the high-voltage line and is laid along the high-voltage line; the temperature sensing optical cable is connected with the distributed optical fiber temperature measuring host through an optical path, the distributed optical fiber temperature measuring host converts an optical signal of temperature change along a high-voltage line into an electric signal of temperature change along the high-voltage line, the output end of the distributed optical fiber temperature measuring host is connected with a controller for calculating the number of times of temperature change according to the temperature change along the high-voltage line through a signal wire, and an alarm signal is output when the number of times is larger than a threshold value, and the output end of the controller is connected with the upper computer. The invention can monitor the bending times of the high-voltage circuit, thereby judging the loss condition of the high-voltage circuit, providing early warning and monitoring for the replacement of the high-voltage circuit of the utility tunnel electric power cabin and improving the safety of the utility tunnel.
Description
Technical Field
The invention belongs to the field of utility tunnel systems, and particularly relates to an intelligent monitoring system and method for pre-warning of line replacement of an electric power cabin of a utility tunnel.
Background
In recent years, with rapid development of cities, the load density of urban centers is increased, and when overhead corridor is difficult or cannot be consistent with urban power supply requirements, most urban power grid distribution systems adopt utility tunnel transmission distribution systems, so that the capability of the power system for resisting natural disasters is improved, and land resources can be utilized to the greatest extent. Long-distance, high-voltage and large-section high-voltage lines occupy a very important position in power distribution network racks in economically developed areas and densely populated areas of large and medium cities, and management maintenance and safe operation of power lines are also becoming more and more important. Although the construction cost of the comprehensive pipe rack is far greater than that of the overhead pipeline and the direct-buried laying mode which are widely adopted at present, in order to enhance the stability and durability of a high-voltage line, reduce repeated excavation, underground space and maintenance cost, improve urban life, improve urban environment, and inevitably have good economic benefit and social benefit from the aspect of improving management, and can realize the purpose of achieving life benefit by once investment. The high-voltage lines have good running conditions in the utility tunnel electric power cabin, relatively constant environment and convenient running management, and particularly when more high-voltage lines are paved in the utility tunnel electric power cabin on the power distribution network of the main city, the utility tunnel electric power cabin can show rationality in the aspects of economic indexes and the like.
In combination with construction operations and engineering practices, the main source of risk of fire in all pipelines is mainly the power line. Cause of ignition of electric power line: poor contact, short to ground, line overload, interphase short, etc. Although the monitoring device in the utility tunnel is complete, maintenance personnel are generally only arranged at key parts such as a monitoring center and the like to be on duty, and other parts are in an unattended state and can only be periodically inspected by maintenance personnel of the utility tunnel. Once a fire occurs, the loss of other circuits in the pipe ditch, the loss of the power circuit and the economic loss of facilities outside the utility tunnel caused by power failure, especially the circuit with high voltage class of 110kV and above, will cause power failure to relevant areas after the fire occurs, and even the whole high-voltage power supply system is crashed because of short circuit.
Disclosure of Invention
The invention aims to solve the technical problems that: the utility tunnel electric power cabin line replacement early warning intelligent monitoring system and the method thereof provide early warning and monitoring for the replacement of the high-voltage line of the utility tunnel electric power cabin, and improve the safety of the utility tunnel.
The technical scheme adopted by the invention for solving the technical problems is as follows: intelligent monitoring system of utility tunnel electric power cabin circuit change early warning, its characterized in that: the temperature sensing optical cable comprises a temperature sensing optical cable, a distributed optical fiber temperature measuring host, a controller and an upper computer; the temperature sensing optical cable for collecting temperature change along the high-voltage line is laid along the high-voltage line in the utility tunnel electric power cabin; the temperature sensing optical cable is connected with the distributed optical fiber temperature measuring host through an optical path, the distributed optical fiber temperature measuring host converts an optical signal of temperature change along a high-voltage line into an electric signal of temperature change along the high-voltage line, the output end of the distributed optical fiber temperature measuring host is connected with a controller for calculating the number of times of temperature change according to the temperature change along the high-voltage line through a signal wire, and an alarm signal is output when the number of times is larger than a threshold value, and the output end of the controller is connected with the upper computer.
According to the system, the upper computer is connected with an alarm device.
According to the system, nodes are arranged along the high-voltage line section, each node is provided with the distributed optical fiber temperature measuring host and the controller which are connected with each other, and the distributed optical fiber temperature measuring host of each node is connected with a temperature sensing optical cable between the current node and the next node; the controller of each node is connected with the upper computer.
According to the system, the controller is connected with the upper computer through a wireless network.
The intelligent monitoring method realized by the intelligent monitoring system for the utility tunnel electric power cabin line replacement early warning is characterized in that: it comprises the following steps:
s1, acquiring temperature changes along a high-voltage line in real time;
s2, calculating the number of temperature change times according to the temperature change along the high-voltage line, wherein the metering principle is as follows: the temperature is changed from small to large, and then the temperature is changed from large to small to be recorded as one time; the temperature is changed from large to small and then recorded as one time from small to large;
and S3, when the number of temperature change times reaches a threshold value, sending out an alarm signal.
According to the method, the threshold value is obtained by the following formula:
in the formula, xi is the strain generated by a sheath layer of the circuit, and has no dimension; d (D) s The outer diameter of the circuit protective layer is in mm; n is the lateral displacement of the line in mm; l is half of the sine-shaped wavelength of the line, and the unit is mm; n (N) s The number of the allowed bending times of the line sheath layer is dimensionless; x is the phase angle;
the allowable bending times N of the line sheath layer are obtained according to the formulas (1) and (2) s I.e. the threshold value of the number of temperature changes.
According to the method, L is half of the sine wave length of the line, and the specific meaning is as follows: if the high-voltage line is laid in a straight line, L is half of the unit length of the line, and the unit length is a sine-shaped wavelength formed when the high-voltage line generates lateral displacement; if the high voltage line is laid sinusoidally, then L is half the line sine wavelength.
According to the method, when the line tension of the high-voltage line is below 6kN in the process of straight line laying, straight line laying is selected; otherwise, sinusoidal laying is adopted.
The beneficial effects of the invention are as follows: the bending times of the high-voltage circuit can be monitored, so that the loss condition of the high-voltage circuit is judged, early warning and monitoring are provided for the replacement of the high-voltage circuit of the utility tunnel electric power cabin, and the safety of the utility tunnel is improved.
Drawings
FIG. 1 is a cross-sectional view of an urban utility tunnel.
Fig. 2 is a schematic diagram of the wiring layout.
FIG. 3 is a schematic diagram of the voltage induced deposition of a metal layer.
Fig. 4 is a schematic diagram of a hardware structure according to an embodiment of the present invention.
In the figure: 1-high voltage circuit; 2-a line connector layer; 3-piping cabins; 4-electric telecommunications compartments; 5-an electric compartment; 6-a bracket supporting arm; 7-a bracket upright post; 8-a temperature sensing optical cable; 1' -a line after temperature rise; 9-insulating joint; 10-ground resistance.
Detailed Description
The invention will be further described with reference to specific examples and figures.
As shown in fig. 1, the utility tunnel includes a piping compartment 3, an electric power telecommunication compartment 4, and an electric power compartment 5, and a high voltage line 1 is provided in the electric power compartment 5. The high-voltage circuit 1 is fixed through a bracket arm 6 and a bracket upright post 7, and a circuit joint layer 2 is arranged at intervals. Each high-voltage line 1 is laid with a temperature sensing optical cable 8. The high-voltage circuit 1 in the invention is a 110kV and above high-voltage circuit. When the ambient temperature inside the pipe rack changes or the line fails in a short circuit, the temperature of the line will change, which will generate a lateral pulling force inside the line. When the line linear laying tension is within 6kN, linear laying can be adopted; when the line straight line laying tension is greater than 6kN, the line in the utility tunnel electric power storehouse can adopt vertical sinusoidal to lay, and then reduces the line tension. The invention takes sine-shaped laying as an example, as shown in fig. 3, an insulating joint 9 and a grounding resistor 10 are respectively arranged at the head and the tail, and as shown in fig. 2, after the temperature is raised, the high-voltage circuit 1 has a lateral displacement n and becomes a circuit 1' after the temperature is raised. If laid straight, there will be a lateral displacement n, thus being sinusoidal.
The normal induced voltage at any point on the metal layer of a single-core line in an ac system, which is indirectly grounded, is generally not greater than 50V when the line conductor is operating normally. Because of 110kV three-phase power supply loop, except laying in places such as lake, sea water and the like and when the section of the line is not large, three-core type lines can be selected, and 3 single-core lines can be selected for each loop. Three-phase power supply loop above 110kV uses 3 single-core cables in response.
Principle is confirmed to utility tunnel electric power cabin circuit laying mode: 1. when the line is laid in a straight line and the line tension meets the requirement (the line tension is generally considered to be limited to be below 6 kN), the investment cost is saved due to the straight line laying, the construction is more convenient, the straight line laying is preferentially adopted, and the lateral displacement n of the line and half L of the sine wavelength of the line are determined; 2. when the line tension of the line linear laying does not meet the requirement, the sine laying is considered to be adopted, so that the line tension and the line induced voltage meet the requirement, and the lateral displacement n of the line and half L of the sine wavelength of the line are determined.
The invention provides an intelligent monitoring system for changing and early warning of an electric power cabin line of a utility tunnel, which is shown in fig. 4, and comprises a temperature sensing optical cable, a distributed optical fiber temperature measuring host, a controller and an upper computer; the temperature sensing optical cable for collecting temperature change along the high-voltage line is laid along the high-voltage line in the utility tunnel electric power cabin; the temperature sensing optical cable is connected with the distributed optical fiber temperature measuring host through an optical path, the distributed optical fiber temperature measuring host converts an optical signal of temperature change along a high-voltage line into an electric signal of temperature change along the high-voltage line, the output end of the distributed optical fiber temperature measuring host is connected with a controller for calculating the number of times of temperature change according to the temperature change along the high-voltage line through a signal wire, and an alarm signal is output when the number of times is larger than a threshold value, and the output end of the controller is connected with the upper computer.
The upper computer is connected with an alarm device.
Further, nodes are arranged along the high-voltage line section, each node is provided with the distributed optical fiber temperature measuring host and the controller which are connected with each other, and the distributed optical fiber temperature measuring host of each node is connected with a temperature sensing optical cable between the current node and the next node; the controller of each node is connected with the upper computer.
The controller is connected with the upper computer through a wireless network.
When the circuit runs for a long time or a short circuit occurs, the temperature of the core wire of the circuit is increased, and the deformation repeatedly occurs along with the periodical change of the temperature of the core wire of the circuit, so that the circuit protection layer is damaged seriously. The intelligent monitoring method realized by the intelligent monitoring system for the utility tunnel electric power cabin line replacement early warning comprises the following steps:
s1, acquiring temperature changes along a high-voltage line in real time;
s2, calculating the number of temperature change times according to the temperature change along the high-voltage line, wherein the metering principle is as follows: the temperature is changed from small to large, and then the temperature is changed from large to small to be recorded as one time; the temperature is changed from large to small and then recorded as one time from small to large;
and S3, when the number of temperature change times reaches a threshold value, sending out an alarm signal.
The threshold is obtained by the following formula:
in the formula, xi is the strain generated by a sheath layer of the circuit, and has no dimension; d (D) s The outer diameter of the circuit protective layer is in mm; n is the lateral displacement of the line in mm; l is half of the sine-shaped wavelength of the line, and the unit is mm; n (N) s The number of the allowed bending times of the line sheath layer is dimensionless; x is the phase angle;
since the sheath layer of the high-voltage line is bent once due to the temperature change once, the allowable bending times N of the sheath layer of the line are obtained according to the formulas (1) and (2) s I.e. the threshold value of the number of temperature changes. When the bending times of the sheath layer exceeds the allowable bending times of the circuit sheath layer, the controller sends an alarm signal to a computer of the monitoring center, and maintenance personnel of the comprehensive pipe rack inform the circuit property units of replacing the power cabin circuit, so that the situation is prevented.
The L is half of the sine wavelength of the line, and the specific meaning is as follows: if the high-voltage line is laid in a straight line, L is half of the unit length of the line, and the unit length is a sine-shaped wavelength formed when the high-voltage line generates lateral displacement; if the high voltage line is laid sinusoidally, then L is half the line sine wavelength. When the line tension of the high-voltage line is below 6kN, selecting the line for laying; otherwise, sinusoidal laying is adopted.
By deeply analyzing the problems of tension, contact voltage, strain and the like of a high-voltage circuit of the utility tunnel electric cabin, the invention provides an intelligent control system and an intelligent control method for determining the replacement early warning of the electric cabin circuit of the utility tunnel electric cabin on the premise of meeting the mechanical property of the circuit, the allowable bending times of a circuit protection layer and ensuring personal safety by combining engineering examples.
The above embodiments are merely for illustrating the design concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, the scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present invention are within the scope of the present invention.
Claims (5)
1. An intelligent monitoring method realized by an intelligent monitoring system for changing and early warning of an electric power cabin line of a utility tunnel is characterized in that: intelligent monitoring system of utility tunnel electric power cabin circuit change early warning, its characterized in that: the temperature sensing optical cable comprises a temperature sensing optical cable, a distributed optical fiber temperature measuring host, a controller and an upper computer; the temperature sensing optical cable for collecting temperature change along the high-voltage line is laid along the high-voltage line in the utility tunnel electric power cabin; the temperature sensing optical cable is connected with the distributed optical fiber temperature measuring host through an optical path, the distributed optical fiber temperature measuring host converts an optical signal of temperature change along a high-voltage line into an electric signal of temperature change along the high-voltage line, the output end of the distributed optical fiber temperature measuring host is connected with a controller for calculating the number of times of temperature change according to the temperature change along the high-voltage line through a signal wire, and an alarm signal is output when the number of times is larger than a threshold value, and the output end of the controller is connected with the upper computer;
the method comprises the following steps:
s1, acquiring temperature changes along a high-voltage line in real time;
s2, calculating the number of temperature change times according to the temperature change along the high-voltage line, wherein the metering principle is as follows: the temperature is changed from small to large, and then the temperature is changed from large to small to be recorded as one time; the temperature is changed from large to small and then recorded as one time from small to large;
s3, when the number of temperature change times reaches a threshold value, an alarm signal is sent out;
the threshold is obtained by the following formula:
in the formula, xi is the strain generated by a sheath layer of the circuit, and has no dimension; d (D) s The outer diameter of the circuit protective layer is in mm; n is a lineLateral displacement in mm; l is half of the sine-shaped wavelength of the line, and the unit is mm; n (N) s The number of the allowed bending times of the line sheath layer is dimensionless; x is the phase angle;
the allowable bending times N of the line sheath layer are obtained according to the formulas (1) and (2) s I.e. the threshold value of the number of temperature changes.
2. The intelligent monitoring method of claim 1, wherein: the upper computer is connected with an alarm device.
3. The intelligent monitoring method of claim 1, wherein: nodes are arranged along the high-voltage line section, each node is provided with the distributed optical fiber temperature measuring host and the controller which are connected with each other, and the distributed optical fiber temperature measuring host of each node is connected with a temperature sensing optical cable between the current node and the next node; the controller of each node is connected with the upper computer.
4. The intelligent monitoring method of claim 1, wherein: the L is half of the sine wavelength of the line, and the specific meaning is as follows: if the high-voltage line is laid in a straight line, L is half of the unit length of the line, and the unit length is a sine-shaped wavelength formed when the high-voltage line generates lateral displacement; if the high voltage line is laid sinusoidally, then L is half the line sine wavelength.
5. The intelligent monitoring method of claim 4, wherein: when the line tension of the high-voltage line is below 6kN, selecting the line for laying; otherwise, sinusoidal laying is adopted.
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