CN106855725B - A monitoring and control device for the operating environment of the landing section of a submarine cable - Google Patents

Abstract

The invention provides a monitoring and control device for the operating environment of a landing section of a submarine cable. The measurement and control device includes a soil thermal resistance coefficient sensor, a soil moisture content sensor, an on-site measurement and control unit, a remote monitoring host, and a soil parameter adjustment device; the soil thermal resistance coefficient sensor The sensor and the soil moisture content sensor are respectively connected with the on-site measurement and control unit, and the on-site measurement and control unit and the soil parameter adjustment device are respectively connected with the remote monitoring host. The technical scheme provided by the invention can monitor the temperature, thermal resistance coefficient and moisture content of the soil, adjust the soil moisture content according to the monitoring results, and then adjust the soil thermal resistance coefficient or directly adjust the soil temperature, so as to improve the heat dissipation capacity of the landing section of the submarine cable, The purpose of improving the current carrying capacity of the landing section of the submarine cable.

Description

A monitoring and control device for the operating environment of the landing section of a submarine cable

technical field

The invention relates to a measurement and control device, in particular to a measurement and control device for adjusting the soil temperature and thermal resistance coefficient of a landing section of a submarine cable to improve the current carrying capacity of the landing section of the submarine cable.

Background technique

According to the difference of cable laying positions, submarine cables can be divided into three parts: submarine section, landing section and air section. In the landing section of the submarine cable, the cable is generally directly buried in the soil (including sand or other special backfill materials). The ambient temperature and the thermal resistance coefficient of the soil near the cable line are important parameters that determine the current carrying capacity of the cable line. Due to the high ambient temperature of the landing section and the large thermal resistance coefficient of the soil, the current carrying capacity of the cable in the landing section is usually significantly lower than that of the submarine section and the air section, which is the bottleneck of the transmission capacity of the submarine cable line.

In the existing submarine cable projects, methods such as stripping the armor of the landing section of the submarine cable, laying cooling water pipes near the landing section of the submarine cable, and replacing the original soil with special backfill are usually used to improve the current carrying capacity of the landing section. Among them, the method of stripping the armor involves the design and construction of the line, which is difficult to implement on the existing line. The method of laying cooling water pipes and backfilling can improve the heat dissipation capacity of the submarine line to a certain extent, but the cooling water pipes have higher requirements on the equipment; the special backfill soil is only used in the local area around the cable, and under the action of long-term high temperature environment, backfilling The properties of the soil may still change.

SUMMARY OF THE INVENTION

In order to solve the above deficiencies existing in the prior art, the present invention provides a monitoring and control device for the operating environment of the landing section of a submarine cable, which adjusts the soil moisture content according to the monitoring results by monitoring the temperature, thermal resistance coefficient and moisture content of the soil. Then adjust the soil thermal resistance coefficient or directly adjust the soil temperature to achieve the purpose of improving the heat dissipation capacity of the submarine cable landing section and increasing the current carrying capacity of the submarine cable landing section.

The technical solution provided by the present invention is: an operation environment measurement and control device for a landing section of a submarine cable, which is improved in that the measurement and control device includes a soil thermal resistance coefficient sensor, a soil moisture content sensor, an on-site measurement and control unit, a remote monitoring host, a soil A parameter adjustment device; the soil thermal resistance coefficient sensor and the soil moisture content sensor are respectively connected with the on-site measurement and control unit, and the on-site measurement and control unit and the soil parameter adjustment device are respectively connected with the remote monitoring host.

Preferably, the soil thermal resistance coefficient sensor is embedded in the soil near the submarine cable in the landing section, and is connected to the on-site measurement and control unit for obtaining the soil thermal resistance coefficient.

Further, the soil thermal resistance coefficient sensor includes a hollow stainless steel cylinder with one end open and the other end sealed, a heating wire arranged at the inner axis of the hollow stainless steel cylinder, a thermocouple and a thermocouple arranged in the hollow stainless steel cylinder. a waterproof plug arranged at the open end of the hollow stainless steel cylinder; the temperature measuring point of the thermocouple is welded on the pipe wall of the hollow stainless steel cylinder;

The heating wire and the thermocouple are respectively connected with the waterproof plug inside the hollow stainless steel cylinder, and the outside of the waterproof plug is connected to one end of the power supply and the signal line; The measurement and control unit is connected to provide a constant DC power supply to the heating wire, and transmits the measurement signal of the thermocouple to the field measurement and control unit.

Further, the sealing end of the hollow stainless steel cylinder is a solid cone coaxial with the hollow stainless steel cylinder; the ratio of the axial length to the radial diameter of the hollow stainless steel cylinder is greater than 20;

The hollow stainless steel cylinder is filled with a thermally conductive material for insulating the hollow stainless steel cylinder, the heating wire and the thermocouple from each other.

Further, the thermal conductivity of the thermally conductive material is greater than 5W/m·K, and the ratio of the heat capacity to the soil to be tested is in the range of 0.5-2.

Preferably, the soil moisture content sensor is embedded in the soil near the submarine cable in the landing section, and is connected to the on-site measurement and control unit to obtain the soil moisture content.

Further, the soil moisture content sensor includes a detection circuit, and a power line, a data line and a probe respectively connected to the detection circuit; the power line is connected to the on-site measurement and control unit, and is used to provide working power for the detection circuit; The data line is connected with the on-site measurement and control unit, and is used for transmitting the measurement signal of the detection circuit to the on-site measurement and control unit; the probe is a pair of strip-shaped metal electrodes distributed in parallel.

Preferably, the on-site measurement and control unit is placed near the submarine cable line of the landing section, including:

Communication input module: connected to the remote monitoring host, for receiving instructions sent by the remote monitoring host, and setting measurement parameters according to the instructions;

DC power supply module: respectively connected to the communication input module and the signal processing module, and used to generate a constant DC power supply according to the measurement parameters set by the communication input module, so as to provide working power for the signal processing module;

Power output module: respectively connected to the DC power module, the soil thermal resistivity sensor and the soil moisture content sensor, for providing the DC power generated by the DC power module to the soil thermal resistivity sensor and the soil thermal resistivity sensor. The soil moisture content sensor;

Signal input module: connected to the soil thermal resistivity sensor and the soil moisture content sensor, for receiving measurement signals from the soil thermal resistivity sensor and the soil moisture content sensor;

Signal processing module: connected to the signal input module, for calculating the soil temperature, thermal resistance coefficient and water content in the test area according to the measurement signal received by the signal input module;

Communication output module: respectively connecting the signal processing module and the remote monitoring host; for transmitting the soil temperature, thermal resistance coefficient and water content calculated by the signal processing module to the remote monitoring host.

Preferably, the soil parameter adjustment device is a cooling water pipe or a water spray device arranged parallel to the submarine cable line of the landing section, and is connected with the remote monitoring host through a signal cable, for adjusting the landing section according to the adjustment instructions of the remote monitoring host Temperature and moisture content of soil near submarine cables.

Preferably, the remote monitoring host is used to receive the measurement data of the on-site measurement and control unit, calculate the change trend of the current carrying capacity of the submarine cable in the landing section, and send adjustment instructions to the soil parameter adjustment device.

Compared with the closest technical solution, the present invention has the following significant progress:

1. The technical solution provided by the present invention uses the temperature, thermal resistance coefficient and water content of the soil near the submarine cable line as the monitoring quantities, which can sensitively and intuitively reflect the changing trend of soil thermal properties and line current carrying capacity.

2. The system error of the soil thermal resistance coefficient sensor provided by the present invention is smaller, and the measurable soil thermal resistance coefficient range is wider.

3. According to the monitoring results, the technical solution provided by the present invention can determine the areas that need to be improved in the landing section line, formulate different soil parameter adjustment measures, and reduce the adjustment cost.

Description of drawings

Fig. 1 is the structural block diagram of the submarine cable landing section operating environment monitoring and control device provided by the present invention;

Figure 2 is a schematic diagram of the structure of the soil thermal resistance coefficient sensor;

Fig. 3 is the hardware structure block diagram of the soil moisture content sensor;

Fig. 4 is the hardware structure block diagram of on-site measurement and control unit;

Among them: 1-soil thermal resistance coefficient sensor, 2-soil moisture content sensor, 3-site measurement and control unit, 4-remote monitoring host, 5-soil parameter adjustment device; 6-hollow stainless steel cylinder; 7-electric heating wire; 8- Thermocouple; 9- thermally conductive material; 10- waterproof plug; 11- power supply and signal line.

Detailed ways

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

For a thorough understanding of the embodiments of the present invention, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the special details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.

This embodiment provides an operating environment measurement and control device for a landing section of a submarine cable. The device monitors the temperature, thermal resistance coefficient and moisture content of the soil, adjusts the soil moisture content according to the monitoring results, and then adjusts the soil thermal resistance coefficient or directly adjusts the soil temperature to achieve To achieve the purpose of improving the heat dissipation capacity of the landing section of the submarine cable and increasing the current carrying capacity of the landing section of the submarine cable.

The overall structure of the operating environment measurement and control device for the landing section of the submarine cable provided in this embodiment is shown in Figure 1: it includes a soil thermal resistance coefficient sensor 1, a soil moisture content sensor 2, an on-site measurement and control unit 3, a remote monitoring host 4, and a soil parameter adjustment device 5. The soil thermal resistance coefficient sensor 1 and the soil moisture content sensor 2 are respectively connected to the on-site measurement and control unit 3, and the on-site measurement and control unit 3 and the soil parameter adjustment device 5 are respectively connected to the remote monitoring host 4.

The soil thermal resistivity sensor 1 is buried in the soil near the submarine cable in the landing section, and one end is connected to the on-site measurement and control unit 3 for acquiring the soil thermal resistivity. Its structure is shown in FIG. 2 , including a hollow stainless steel cylinder 6 , a heating wire 7 , a thermocouple 8 , a thermally conductive material 9 , a waterproof plug 10 , and a power supply and a signal line 11 .

The soil thermal resistance coefficient sensor 1 is based on the hot wire method, and its working principle is as follows: the hollow stainless steel cylinder 6 is a hollow stainless steel tube with a solid cone at one end, the heating wire 7 is located at the inner axis position of the hollow stainless steel cylinder 6, and the thermocouple 8 measures. The temperature spot is welded on the tube wall of the hollow stainless steel cylinder 6 , and the thermocouple 8 wires are located inside the hollow stainless steel cylinder 6 . The heating wire 7 and the thermocouple 8 are connected to the waterproof plug 10 inside the hollow stainless steel cylinder 6 . The heat-conducting material 9 is filled inside the hollow stainless steel cylinder 6 , and functions to conduct heat and electrically insulate the hollow stainless steel cylinder 6 , the heating wire 7 and the thermocouple 8 wires of the thermocouple 8 from each other. The waterproof plug 10 is installed at the end of the hollow stainless steel cylinder 6. One end of the power supply and signal line 11 is connected to the waterproof plug 10, and the other end is connected to the on-site measurement and control unit 3. The function is to provide a constant DC power supply for the heating wire 7 and transmit the thermocouple. 8 measurement signals.

In the soil thermal resistance coefficient sensor 1, the aspect ratio of the hollow stainless steel cylinder 6 is greater than 20.

The soil thermal resistivity sensor 1 is a probe based on the hot wire method. The probe is filled with a thermally conductive material 9. The thermal conductivity of the thermally conductive material 9 is greater than 5W/m·K, and the ratio of the heat capacity to the soil to be measured is 0.5-2. within the range.

The soil moisture content sensor 2 is embedded in the soil near the submarine cable in the landing section, and one end is connected to the on-site measurement and control unit 3 for acquiring the soil moisture content. Its structure is shown in Figure 3, including power lines, data lines, detection circuits and probes. The power line is respectively connected with the field measurement and control unit 3 and the detection circuit, the data line is respectively connected with the field measurement and control unit 3 and the detection circuit, the detection circuit is connected with the probe, and the probe is a pair of parallel strip metal electrodes.

The soil moisture content sensor 2 is based on frequency domain reflection technology, and its working principle is: a pair of parallel distributed strip metal electrodes of the probe and the soil between the electrodes form a capacitance, and a voltage signal with a frequency change is generated in the detection circuit. At the frequency, the detection circuit and the probe form an oscillation circuit, the power line provides power for the detection circuit, and the data line transmits the measurement signal in the detection circuit.

The on-site measurement and control unit 3 is placed near the submarine cable line of the landing section, and is used to supply power to the soil thermal resistivity sensor 1 and the soil moisture sensor, and to receive measurements from the soil thermal resistivity sensor 1 and the soil moisture content sensor 2 data.

The overall hardware structure block diagram of the on-site measurement and control unit 3 is shown in Figure 4, including a communication input module, a DC power supply module, a power output module, a signal input module, a signal processing module, and a communication output module. The communication input module is connected with the DC power module, and its function is to receive the instructions from the remote monitoring host 4 and set the measurement parameters according to the instructions. The DC power module is connected with the power output module and the signal processing module, and its function is to generate a constant DC according to the measurement parameters. The power supply, the power output module is connected with the soil thermal resistance coefficient sensor 1 and the soil moisture content sensor 2, and its function is to provide a constant DC power supply for the sensor, and the signal input module is connected with the signal processing module, and its function is to receive the measurement of the sensor Signal, the signal processing module is connected with the DC power module, the signal input module and the communication output module, and its function is to calculate the soil temperature, thermal resistance coefficient, water content and other signal values of the soil in the test area according to the measurement signal received by the signal input module. The output module is connected with the signal processing module, and its function is to transmit the signal value generated by the signal processing module to the remote monitoring host 4 .

The soil parameter adjustment device 5 is arranged along the submarine cable line of the landing section, and is connected with the remote monitoring host 4 through a signal cable, and is used to adjust the temperature and water content of the soil near the submarine cable in the landing section according to the adjustment instruction of the remote monitoring host 4. .

The soil parameter adjustment device 5 is a cooling water pipe or a water spray device arranged parallel to the submarine cable line of the landing section.

The remote monitoring host 4 is used to receive the measurement data of the on-site measurement and control unit 3 , calculate the change trend of the current carrying capacity of the submarine cable in the landing section, and send adjustment instructions to the soil parameter adjustment device 5 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still implement the present invention. Modifications or equivalent substitutions are made in any manner, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are all within the protection scope of the pending claims.

Claims (5)

1. a submarine cable landing section operating environment measurement and control device, is characterized in that: the measurement and control device comprises a soil thermal resistance coefficient sensor, a soil moisture content sensor, an on-site measurement and control unit, a remote monitoring host, a soil parameter adjustment device; The resistivity sensor and the soil moisture content sensor are respectively connected with the on-site measurement and control unit, and the on-site measurement and control unit and the soil parameter adjustment device are respectively connected with the remote monitoring host; The soil thermal resistance coefficient sensor is buried in the soil near the submarine cable in the landing section, and is connected to the on-site measurement and control unit for obtaining the thermal resistance coefficient of the soil; The soil thermal resistance coefficient sensor includes a hollow stainless steel cylinder with one end open and the other end sealed, a heating wire arranged at the inner axis of the hollow stainless steel cylinder, a thermocouple arranged in the hollow stainless steel cylinder and a thermocouple arranged in the hollow stainless steel cylinder. the waterproof plug at the open end of the hollow stainless steel cylinder; the temperature measuring point of the thermocouple is welded on the pipe wall of the hollow stainless steel cylinder; The heating wire and the thermocouple are respectively connected with the waterproof plug inside the hollow stainless steel cylinder, and the outside of the waterproof plug is connected to one end of the power supply and the signal line; The measurement and control unit is connected to provide a constant DC power supply to the heating wire, and transmits the measurement signal of the thermocouple to the field measurement and control unit; the sealing end of the hollow stainless steel cylinder is in the shape of a The solid cone of the cylinder coaxial line; the ratio of the axial length to the radial diameter of the hollow stainless steel cylinder is greater than 20; The hollow stainless steel cylinder is filled with a thermally conductive material, which is used to insulate the hollow stainless steel cylinder, the heating wire and the thermocouple from each other; The thermal conductivity of the thermally conductive material is greater than 5W/m·K, and the ratio of the heat capacity to the soil to be tested is in the range of 0.5-2; The on-site measurement and control unit is placed near the submarine cable line in the landing section, including: Communication input module: connected to the remote monitoring host, for receiving instructions sent by the remote monitoring host, and setting measurement parameters according to the instructions; DC power supply module: respectively connected to the communication input module and the signal processing module, and used to generate a constant DC power supply according to the measurement parameters set by the communication input module, so as to provide working power for the signal processing module; Power output module: respectively connected to the DC power module, the soil thermal resistivity sensor and the soil moisture content sensor, for providing the DC power generated by the DC power module to the soil thermal resistivity sensor and the soil thermal resistivity sensor. The soil moisture content sensor; Signal input module: connected to the soil thermal resistivity sensor and the soil moisture content sensor, for receiving measurement signals from the soil thermal resistivity sensor and the soil moisture content sensor; Signal processing module: connected to the signal input module, for calculating the soil temperature, thermal resistance coefficient and water content in the test area according to the measurement signal received by the signal input module; Communication output module: respectively connecting the signal processing module and the remote monitoring host; for transmitting the soil temperature, thermal resistance coefficient and water content calculated by the signal processing module to the remote monitoring host. 2. submarine cable landing section operating environment monitoring and control device according to claim 1, is characterized in that: The soil moisture content sensor is embedded in the soil near the submarine cable in the landing section, and is connected to the on-site measurement and control unit for acquiring the soil moisture content. 3. submarine cable landing section operating environment monitoring and control device according to claim 2, is characterized in that: The soil moisture content sensor includes a detection circuit, and a power line, a data line and a probe respectively connected to the detection circuit; the power line is connected to the on-site measurement and control unit, and is used to provide working power for the detection circuit; the The data line is connected with the field measurement and control unit, and is used for transmitting the measurement signal of the detection circuit to the field measurement and control unit; the probe is a pair of strip-shaped metal electrodes distributed in parallel. 4. submarine cable landing section operating environment monitoring and control device according to claim 1, is characterized in that: The soil parameter adjustment device is a cooling water pipe or a water spray device arranged parallel to the submarine cable line of the landing section, and is connected with the remote monitoring host through a signal cable for adjusting the vicinity of the submarine cable in the landing section according to the adjustment instruction of the remote monitoring host. soil temperature and moisture content. 5. submarine cable landing section operating environment monitoring and control device according to claim 1, is characterized in that: The remote monitoring host is used to receive the measurement data of the on-site measurement and control unit, calculate the change trend of the current carrying capacity of the submarine cable in the landing section, and send adjustment instructions to the soil parameter adjustment device.

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