CN115037061A

CN115037061A - Detection module and submarine cable power supply equipment

Info

Publication number: CN115037061A
Application number: CN202110200714.7A
Authority: CN
Inventors: 杨少荣; 武卫东; 苏丹; 许昌武
Original assignee: Huahai Communication Technology Co ltd
Current assignee: Huahai Communication Technology Co ltd
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2022-09-09

Abstract

The application provides a detection module and submarine cable power supply unit, detection module includes detecting element and power supply unit, and power supply unit includes receiving coil and transmitting coil. The receiving coil is arranged in the high-voltage area, and the transmitting coil is arranged in the low-voltage area, so that the transmitting coil and the receiving coil form space coupling to supply power to the acquisition unit. By arranging the receiving coil and the transmitting coil in the high-voltage area and the low-voltage area respectively, the space coupling effect between the two coils can be utilized to realize isolated power supply. Because the energy transmission mode of space coupling does not need to adopt bulky special-shaped structures such as magnetic core, consequently can reduce the volume of power supply unit under the prerequisite of guaranteeing the isolation demand, and then reduce the whole volume of detecting module.

Description

Detection module and submarine cable power supply equipment

Technical Field

The application relates to the technical field of submarine cable systems, in particular to a detection module and submarine cable power supply equipment.

Background

A Power Feeding Equipment (PFE) applied to a submarine cable line is a constant-current power supply system and can provide electric energy for the submarine cable system. Typically, a remote power supply system is provided in the terminal station, which can convert a low voltage of-48V into a high voltage of 18KV to supply a constant current to the underwater equipment. The remote power supply system is provided with a plurality of converters, an output monitoring device and a test load device, and the converters, the output monitoring device and the test load device can convert and regulate power supply voltage so as to output constant-current electric energy.

The remote power supply system internally comprises a high-voltage area and a low-voltage area, wherein the high-voltage area is used for outputting high voltage, and the low-voltage area is used for controlling the output state. In order to output stable voltage or current, a detection module is further arranged in the power supply equipment and used for collecting running state information such as voltage, current and temperature of the high-voltage area, and therefore the running state information is sent to a low-voltage control system through a signal processing circuit to achieve output adjustment of the power supply equipment.

The detection module can be used for completing the acquisition of the information of the high-voltage area by using the sampling resistor, namely after the sampling resistor detects the analog quantity of the running state information, the signal processing is carried out through the analog-digital converter and the controller, and then the detection data is sent to the low-voltage area from the high-voltage area through the optical fiber. In the above-mentioned detection process, the detection module needs a low-voltage region to supply power to the detection module, such as an isolation transformer arranged between the high-voltage region and the low-voltage region. However, the isolation transformer needs to strictly control the structures of the coil and the magnetic core, so that the inside of the detection module meets the insulation performance requirements of a high-voltage area and a low-voltage area, and a large-volume special-shaped structural part needs to be used for ensuring the creepage distance of the coil part, so that the whole volume of the detection module is large.

Disclosure of Invention

The application provides a detection module and submarine cable power supply unit to solve the bulky problem of traditional detection module.

In a first aspect, the present application provides a detection module, including a high voltage region and a low voltage region, where a detection unit is disposed in the high voltage region, and the detection unit is configured to collect operating state information such as voltage, current, and temperature; the detection module further comprises a power supply unit, wherein the power supply unit is connected with the acquisition unit and used for acquiring electric energy from low voltage and transmitting the electric energy to the high voltage area so as to supply power to the acquisition unit positioned in the high voltage area.

Wherein, the power supply unit includes receiving coil and transmitting coil. The receiving coil is arranged in the high-voltage area, and the transmitting coil is arranged in the low-voltage area, so that the transmitting coil and the receiving coil form space coupling to supply power to the acquisition unit. By arranging the receiving coil and the transmitting coil in the high-voltage area and the low-voltage area respectively, the space coupling effect between the two coils can be utilized to realize wireless power supply. Because the energy transmission mode of space coupling does not need to adopt bulky special-shaped structural parts such as magnetic cores, the volume of the power supply unit can be reduced on the premise of ensuring the isolation requirement, and then the whole volume of the detection module is reduced.

In one implementation, the power supply unit further includes an insulating fixing member. An insulating mount is disposed between the receive coil and the transmit coil to electrically isolate the high voltage region from the low voltage region. The insulating fixture may improve isolation between the high voltage region and the low voltage region by an insulating material. Compared with an air gap insulation mode, the insulation fixing piece can obtain higher insulation voltage resistance and creepage distance in a smaller interval distance, and the whole volume of the detection module is reduced.

In a practical mode, insulating mounting is the grooved box structure in both ends to form high-pressure region mounting groove and low-pressure region mounting groove in insulating mounting, insulating mounting can be the integrated into one piece structure promptly. Wherein the high voltage region mounting groove is used for accommodating the detection unit and the receiving coil, and the low voltage region mounting groove is used for accommodating the transmitting coil. The insulating fixing member may be formed with a high voltage region mounting groove and a low voltage region mounting groove by grooving in directions of both end surfaces of the cubic insulating material, respectively. And arranging the electric elements corresponding to the high-voltage area and the low-voltage area in the mounting groove to form the whole detection module. Through insulating mounting, not only can carry out electrical isolation to high-voltage area and low-voltage area, can also form whole shell and encapsulate the electrical component in high-voltage area and the low-voltage area, make detection module's the shortest creepage path be whole casing, be convenient for satisfy submarine cable power supply unit's creepage distance requirement.

Wherein, be equipped with the energy transfer region between high-pressure region mounting groove and the low-pressure region mounting groove. A receiving coil is arranged on one side of the energy transfer area close to the high-voltage area mounting groove; and a transmitting coil is arranged on one side of the energy transfer area close to the low-voltage area mounting groove. The energy transfer area is a partial area in the insulating mount, i.e. a partial area in which the receiving coil and the transmitting coil coincide with each other. The detection module can realize the electrical isolation of a high-voltage area and a low-voltage area through the whole insulating fixing piece, and can transmit the magnetic energy generated by the transmitting coil to the receiving coil in the energy transmission area, so that the spatial coupling between the transmitting coil and the receiving coil is realized, and the wireless power supply is completed.

To meet the requirements of isolation performance and spatial coupling processes, the thickness of the energy transfer region should be greater than the isolation thickness. Wherein the standoff thickness is a minimum separation distance calculated from a voltage difference between the high voltage region and the low voltage region under the insulating material of the insulating fixture. The thickness of the energy transfer area should be as small as possible on the premise of meeting the requirement of isolation performance, so that the energy transfer efficiency between the sending coil and the receiving coil is ensured, and the overall volume of the detection module is reduced.

In one implementation, the power supply unit further comprises a pulse width modulation, PWM, generator. The PWM generator is disposed in a low-voltage region, the PWM generator is connected to the transmitting coil, and the PWM generator is configured to supply a driving voltage to the transmitting coil. The PWM generator may receive the supply voltage set by the low voltage region control unit and generate a driving voltage according to the supply voltage to be input to the transmitting coil, thereby forming a high frequency oscillating magnetic field in the transmitting coil.

In the same way, after the sending coil generates the high-frequency oscillating magnetic field, the receiving coil can induce induced voltage in the high-frequency oscillating magnetic field, so that the induced voltage is reduced to the standard voltage with a specific voltage value, and power is supplied to the detection unit. For this purpose, the power supply unit further comprises a power management circuit, which is arranged in the high-voltage region and which is connected to the receiving coil. The power management circuit is configured to convert an induced voltage induced by the receiving coil into a standard voltage suitable for the detection unit.

Therefore, the PWM generator can convert the electric energy supplied by the low-voltage area into an electric energy form capable of being spatially coupled, and the electric energy passes through the energy transfer area to reach the position of the receiving coil, so that the receiving coil can induce induced voltage, and the induced voltage is reduced to standard voltage through the power management circuit, and the spatially coupled energy transfer mode is realized.

In order to realize the detection function, in one implementation mode, the detection unit further comprises a sampling circuit, and the sampling circuit is connected with the power management circuit to obtain power supply through the power management circuit, and detect and send running state information such as current, voltage and temperature. A low-voltage control unit is arranged in the low-voltage area, and an optical transmission unit is arranged in the high-voltage area; the sampling circuit is connected with the low-voltage control unit through the optical transmission unit so as to send collected running state information to the low-voltage control unit.

The sampling circuit comprises a sensor, an AD converter, a signal processor and an optical fiber transmitter. The sensor can detect the power supply state, generate an analog signal and send the analog signal to the AD converter; the AD converter converts the analog signal into a digital signal and transmits the digital signal to the signal processor; the signal processor further converts the digital signal, such as converting into an optical signal form, so that the detected operation state information can be sent to the low-voltage control unit for processing through the optical signal.

Therefore, the sensor, the AD converter, the signal processor and the optical fiber transmitter are respectively connected with the power management circuit; and the sensor is connected with the optical fiber transmitter through the AD converter and the signal processor in sequence, so that the detected running state information is converted into a digital signal and then is transmitted to the low-voltage control unit through the optical fiber transmitter. The optical fiber transmitter can convert the electric signal into an optical signal for transmission, so that data transmission is performed by using an optical fiber transmission mode. The optical fiber transmission can obtain better data transmission effect, and the medium of the optical fiber transmission is not a conductor, which is beneficial to maintaining the electrical isolation performance between the high-voltage area and the low-voltage area.

In one implementation, the transmitting coil and the receiving coil are PCB engraved coils. Namely, two PCB boards can be respectively formed by engraving coils on the PCB, and the PCB boards are used as the functions of the sending coil and the receiving coil. The coil is carved on the PCB, so that the whole structure of the power supply unit can be simplified, and the stable electric energy transfer performance can be obtained. In addition, the transmitting coil and the receiving coil can be designed into regular shapes by utilizing the PCB engraving coil, the process is simple and reliable, and the difficulty in obtaining the power supply unit is reduced.

In a second aspect, the present application further provides a submarine cable power supply apparatus, which includes a follow current module, an output monitoring device, a submarine cable access module, and a plurality of converters. Wherein the converter may perform a voltage conversion converting an initially supplied low voltage into a high voltage usable by the submarine cable system. The plurality of converters are connected in series and then connected with the follow current module, so that the total output voltage is improved. The follow current module is connected with the submarine cable access module through the output monitoring device, so that the output total voltage is regulated and then is transmitted to the submarine cable line, and the submarine cable line is powered.

The converter and the output monitoring device both comprise the detection module, and the detection module can detect the running state information in a plurality of areas of the high-voltage area and transmit the detection result to the low-voltage area for processing, so that the output voltage is regulated. The detection module adopts a power supply unit for space coupling power supply, and the whole volume is smaller, so that the occupation of the space in the converter and the output monitoring device can be reduced, and the reasonable distribution of the space in the converter and the output monitoring device is facilitated.

In one implementation, the submarine cable power supply equipment further comprises a test load device, the test load device is connected with the follow current module, and the test load device is internally provided with a detection module. The test load device can be used for pre-adjusting and auxiliary testing the output voltage, and the stability of the output voltage is ensured. Meanwhile, the detection module is arranged in the load testing device, so that the integral volume of the load device can be reduced, and the load testing work can be completed conveniently.

Drawings

FIG. 1 is a schematic diagram of a typical marine cable power supply system;

FIG. 2 is a diagram of an entity of a working scenario of a detection module in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a detection module according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a detection module according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a high-voltage mounting groove of an insulation fixing member according to an embodiment of the present application;

FIG. 6 is a schematic view of a low-voltage mounting groove of an insulating fixing member according to an embodiment of the present application;

FIG. 7 is a cross-sectional view of an insulating fixture according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a submarine cable power supply system according to an embodiment of the present application.

Detailed Description

In the embodiments of the present application, a submarine cable system, that is, an undersea optical cable system, refers to a communication network system formed by a plurality of communication cables. The communication cables in the system are laid on the seabed and may therefore be referred to as submarine cables. The submarine cable line can transmit optical communication signals between end stations, and the function of cross-sea area communication is achieved. Submarine cable systems can enable long distance communications, for example, data communications can be accomplished across the ocean for tens of thousands of kilometers. It should be noted that the submarine cable system described in the embodiment of the present application can also be used in relatively close communication areas such as crossing rivers, lakes, and the like.

The end station is a base station in the submarine cable system and is used for forwarding, controlling and adjusting transmitted signals so as to maintain normal communication of the submarine cable system. The end station can also perform maintenance operations such as power supply, maintenance, control strategy modification and the like on the submarine cable line so as to ensure the normal operation of the communication function. For this purpose, a control device, a signal processing device, an interface device, a power supply device, and the like may be built in the end station.

Each submarine cable line in the submarine cable system can be provided with a plurality of electrical devices, such as splitters and the like. These electrical devices need to be powered by a submarine power supply to maintain proper operation of the system. The long-distance submarine cable transmission link is a constant-current system, namely, the power supply voltage can be adjusted through submarine cable power supply equipment, so that a constant current value is maintained in a submarine cable line. For example, a submarine power unit may convert a low voltage of-48V to a high voltage to create a constant current in the submarine line as required by the subsea equipment.

In order to be able to output a constant current, as shown in fig. 1, a plurality of parts may be integrated inside the submarine cable power supply equipment, including a converter, a freewheeling module, an output monitoring device, a submarine cable access module, and the like. Wherein the converter switches in the initial supply path to obtain an initial supply voltage, such as a supply voltage of-48V. The converter converts the low voltage to a high voltage, such as a supply voltage of 18kV, via an internal conversion circuit.

Due to the limited voltage conversion capability of a single converter, when the submarine cable line is long, multiple converters are required to work in series to convert the output voltage to a higher voltage value level. For example, a single converter can convert an input-48V voltage to a 3000V output, whereas the maximum output voltage requirement of the corresponding power supply equipment can reach 18kV when the length of the submarine cable line reaches 10000 km. Thus, a number (1-6) of converters can be connected in series by the freewheel module, so that the total output voltage reaches 18 kV.

A plurality of converters can be connected with a follow current device after being connected in series to form total output voltage, and the follow current device is connected with an output monitoring device to realize control and regulation of the output voltage. The output monitoring device can acquire running state information such as voltage, current and temperature in the power supply path in real time, and adjusts power supply parameters according to the detected running state information so as to maintain the output current constant.

The output electric energy adjusted by the output monitoring device can supply power for a submarine cable line, so that the output monitoring device can be connected with a submarine cable access module. The submarine cable access module can be connected with a submarine cable line and transmits supplied electric energy to electrical equipment in the submarine cable line, and constant-current power supply of the submarine cable line is achieved.

The test load device can simulate the load access condition in the circuit before the submarine cable power supply device formally supplies power to the submarine cable circuit, so that the power supply parameters can be adjusted before the submarine cable circuit is supplied with power, and the output current is constant.

As can be seen, in the above-described submarine cable power supply equipment, in order to be able to output a constant current, the operating state information needs to be detected at a plurality of locations within the submarine cable power supply equipment. The operating state information can be detected, for example, in the converter, the output monitoring module and the test load module for the control of the output power.

For this purpose, a detection module may be further disposed in the submarine cable power supply equipment. The detection module is used for detecting the running state information at a specific position in the submarine cable power supply system, including but not limited to voltage, current, temperature and other information. For example, a detection module may be provided in the converter for performing closed-loop control adjustments of the converter. Since the converter needs to output the supply voltage in the form of a high voltage, a high voltage region and a low voltage region can be formed inside the converter. The detection module can collect information such as voltage, current, temperature and the like of a high-voltage area of the converter and sends the information to the control unit positioned in a low-voltage area through an internal signal processing circuit to complete closed-loop regulation of the converter.

The detection module may include a detection unit and a power supply unit supplying power to the detection unit. Wherein, the detection unit can detect the running state information in the submarine cable power supply equipment through a sensor of a specific type. For example, the voltage and current in the submarine cable power supply equipment can be obtained by detecting the intensity of the magnetic field through a hall sensor.

In order to improve the detection accuracy and detect more types of operation state information, in some embodiments, a resistive sensor may also be used as the detection unit of the detection module. The analog quantity of voltage, current and temperature is detected by using a sampling resistor, and the analog quantity is transmitted to a control unit after signal conversion and processing.

When the resistance-type sensor is used for detecting the running state information, the current and the voltage in the submarine cable power supply equipment can be detected, a plurality of running state information types such as the temperature in the submarine cable power supply equipment can be detected, and the detection result is more accurate compared with a Hall sensor.

Whatever type of detection unit, power needs to be supplied to maintain stable operation during normal operation. For example, the power supply data detected by the resistance sensor is analog, needs to be converted into digital signals through the analog-to-digital conversion unit, and is sent to the control unit through data transmission methods such as optical fibers after signal processing, so that the detection module needs to be powered when working normally. The power supply of the detection module needs to be completed by a low-voltage area, for example, in a converter, the output of the high-voltage area is controlled by a low-voltage area control unit, the high-voltage area cannot provide a continuous power supply for the detection module, and the detection module needs to take power from the low-voltage area and maintain 1W of running power to ensure a normal working state.

However, in the submarine cable power supply equipment, since the collected data is mostly the operation state information in the high-voltage area, and the power supply to the detection module needs to be obtained from the low-voltage area, as shown in fig. 2, the detection module works between the high-voltage area and the low-voltage area. For example, the power supply module may be an isolation transformer disposed between the high-voltage region and the low-voltage region, so that the detection module draws power from the low-voltage region and supplies the power to the detection unit in the high-voltage region.

And the power supply unit of the detection module needs to meet the insulation requirement, namely the acquired electric signal needs to be isolated by more than 18kV and then is sent to the low-voltage area control unit for control. For example, according to the IEC-62368 safety standard, an 18kV electrical gap is the basis insulation: 30 mm; reinforcing and insulating: 52.2 mm; the 18kV creepage distance is 180mm (pollution class: 2; material class: 3); 18kV creepage distance: 71.5mm (contamination grade: 1; material grade: 3). However, the isolation transformer cannot be insulated by increasing the air gap due to the presence of the magnetic core. And the creepage distance between the coils is required to be ensured to be larger than 180mm on a 1W transformer by increasing the creepage distance to ensure the insulation requirement. This results in complex overall structure and process of the detection module, and the creepage distance between the coil and the magnetic core and between the coils need to be strictly controlled. Structurally, the large-size special-shaped structural part needs to be increased to ensure that the creepage distance between coils is larger than 180mm, so the special-shaped structural part usually needs to be processed for many times, the process is complicated, and the occupied size of the detection module is large after the installation is finished.

In addition, in order to ensure the electrical isolation between the high voltage region and the low voltage region, the isolation transformer needs to be isolated from the peripheral devices at the same time, so that the occupied space is further increased. In order to ensure the reliability of the PFE, the detection modules are disposed at multiple positions in the PFE architecture, for example, in the PFE with 18KV output capability, the usage amount of the detection modules can reach 20pcs (pieces), which results in that the detection modules occupy a larger space in the PFE, which is not favorable for the installation layout of other electrical devices.

In order to reduce the overall size of the detection module, some embodiments of the present application provide a detection module, as shown in fig. 3 and 4, which can be applied to a submarine cable power supply device to detect the operating state information inside the device. It should be noted that in the embodiment of the present application, a submarine cable power supply device is used as an application scenario of the detection module, but the detection module provided in this embodiment is not limited to be applied to a submarine cable power supply device, and may also be applied to other devices to detect relevant information such as voltage, current, and temperature inside the device, and save an internal space of the device.

The detection module includes a high voltage region and a low voltage region. The low-voltage area refers to a part of the detection module, which is located in a low-voltage area inside the device, and the high-voltage area refers to a part of the detection module, which is located in a higher-voltage area inside the submarine cable power supply device. Because the detection module detects a high-voltage area in the equipment, a detection unit is arranged in the high-voltage area of the detection module. And, the detection unit is configured to collect operation state information, such as current, voltage, temperature, etc.

Wherein the detection unit may include different sensors according to the type of the physical quantity detected. Such as a voltage sensor, a current sensor, a temperature sensor, etc. The specific detection principle may be determined in accordance with the applicable range of the detected physical quantity. For example, when the output voltage of the submarine cable power supply is large, a resistive sensor may be employed. A plurality of sensors may also be provided in the detection unit, and the plurality of sensors may be different types of sensors. Different sensors can detect different positions in the high-voltage area of the submarine cable power supply equipment to obtain detection data of different types at different positions, so that the running state of the submarine cable equipment is comprehensively detected.

The operation state information detected by the detection unit can be used in the power supply adjustment process of the submarine cable power supply equipment, for example, a control unit can be arranged in the submarine cable power supply equipment, and after the detection unit detects power supply data, the detection unit can send the detected data to the control unit for processing, so that the control unit adjusts the power supply process according to the detected operation state information, and the voltage and the current output by the submarine cable power supply equipment are maintained to meet the design requirements.

In order to supply power to the detection unit, the detection module further comprises a power supply unit, and the power supply unit is connected with the acquisition unit so as to supply power to the acquisition unit, so that the detection unit needs to stably operate on constant power of about 1W for a long time. Wherein, the power supply unit includes receiving coil and transmitting coil. The receiving coil is arranged in the high-voltage area and is connected with the detection unit. The transmitting coil is arranged in the low-voltage area so as to form space coupling through the transmitting coil and the receiving coil and supply power to the acquisition unit.

In this embodiment, the transmitting coil may generate a changing magnetic field in the space after an ac driving voltage of a specific frequency is applied. The receiving coil is positioned in the generated magnetic field and induces induced voltage when the magnetic field changes through space coupling, so that energy is transferred to supply power for the detection unit. The detection module can adopt the power supply unit based on the space coupling energy transmission mode to supply power to the detection unit, so the power supply unit does not need to adopt bulky special-shaped structural parts such as magnetic cores, and can reduce the volume of the power supply unit on the premise of guaranteeing the isolation requirement, and then reduce the whole volume of the detection module.

In some implementations, as shown in fig. 4, the transmitting coil and the receiving coil may be engraved with a Printed Circuit Board (PCB). The PCB engraving coil can be used for molding a coil structure on the printed circuit board through the engraving process of the printed circuit board, the PCB engraving coil is used as a transmitting coil and a receiving coil, the availability of the coil is good, the process is simple and reliable, and the transmitting coil and the receiving coil with stable performance can be obtained. And, the PCB-engraved coil facilitates the formation of a regular shape for arranging the internal construction of the detection module.

Since the transmitting coil can perform energy transfer while being spaced apart from the receiving coil by a certain distance, an insulating material can be disposed between the transmitting coil and the receiving coil to improve the isolation between the high voltage region and the low voltage region in a limited space. That is, in one exemplary embodiment, the power supply unit further includes an insulating fixture, as shown in fig. 5, 6, and 7. An insulating mount is disposed between the receive coil and the transmit coil to electrically isolate the high voltage region from the low voltage region.

The insulating fixing piece is made of insulating materials, and good isolation performance can be obtained when the thickness is small. For example, compared with the air insulation mode, when the insulation fixing member is made of an insulation material such as Polyoxymethylene (POM), the insulation voltage resistance can easily reach 20 kV/mm. Therefore, under the condition of the same thickness, the insulating and voltage-resisting capacity between the high-voltage area and the low-voltage area can reach 10 times of the air insulating and voltage-resisting capacity by using the insulating fixing piece.

The insulating fixing piece can be in different shapes according to different specific structures of the detection module. For example, as shown in fig. 7, when the high voltage region and the low voltage region are respectively located at the upper right region and the lower left region of the whole body in the detection module, the insulating fixing member may have a stepped structure in order to electrically isolate the high voltage region and the low voltage region. The insulating fixing piece with the ladder-shaped structure not only has an insulating and isolating effect, but also can support the electric elements on two sides, and is convenient to mount.

In order to obtain better insulation effect, the insulation fixing member can be provided with a shape with a larger specific surface area so as to increase the creepage distance between the high voltage area and the low voltage area. That is, in an exemplary embodiment, the insulating fixing member is a box structure having both ends thereof slotted to form a high voltage region mounting groove and a low voltage region mounting groove in the insulating fixing member. For example, the insulating fixture may take the entire block of insulating material, measuring 80mm by 50mm by 30 mm. And as shown in fig. 5, 6 and 7, the entire insulating material is numerically controlled (CNC) grooved to form high-voltage region seating grooves and low-voltage region seating grooves.

Wherein the high voltage region mounting groove is for accommodating the sensing unit and the receiving coil, and the low voltage region mounting groove is for accommodating the transmitting coil. For example, after the entire block of insulating material is grooved, a Printed Circuit Board Assembly (PCBA) and a high voltage area PCBA may be inserted at both ends, respectively. Therefore, the shortest creepage path is 80mm of the shell and is larger than 71.5mm because the circuit part is wrapped in the insulating material, and the requirement of the safety creepage distance of 18kV can be met when the safety pollution level is 1 level.

Since the power supply unit of the detection module needs to locate the receiving coil in the magnetic field formed by the transmitting coil after being installed in the insulating fixture in order to be able to induce voltage and current, the transmitting coil and the receiving coil can be made to have a full or partial overlap in a partial region after the high voltage region electrical component and the low voltage region electrical component are installed in the opened installation groove. The coincidence relation means that when the two coils project to the same plane, the formed projections are totally or partially coincident. For example, as shown in FIG. 4, after the low voltage area PCBA is installed in the lower left region and after the high voltage area PCBA is installed in the upper right region, the transmit coil and the receive coil may partially overlap in the area of the dashed line to allow energy transfer.

When the transmitting coil and the receiving coil have a coincident relationship, an energy transfer region may be formed between the high-voltage region mounting groove and the low-voltage region mounting groove. The energy transfer area is a partial area on the insulating fixing piece, can pass through a magnetic field and has insulation. And a receiving coil is arranged on one side of the energy transfer area close to the high-voltage area mounting groove, and a sending coil is arranged on one side of the energy transfer area close to the low-voltage area mounting groove. After the driving voltage with specific frequency is introduced into the sending coil, an oscillating magnetic field can be generated, and the oscillating magnetic field can pass through the energy transfer area and reach the position of the receiving coil, so that the receiving coil can induce induced voltage, and voltage and current are formed, and energy transfer is realized.

In the above embodiments, the energy transfer region may insulate the high voltage region from the low voltage region for better isolation performance, and therefore the thickness of the energy transfer region should be greater than the isolation thickness. Wherein the standoff thickness is a minimum separation distance calculated from a voltage difference between the high voltage region and the low voltage region under the insulating material of the insulating fixture. For example, when the insulating fixture material is polyoxymethylene, the dielectric withstand voltage is 20kV/mm, i.e., an 18kV voltage difference is present between the high voltage region and the low voltage region, the minimum separation distance is 18/20-0.9 mm, i.e., the energy transfer region thickness should be greater than 0.9 mm.

Meanwhile, the energy transfer area cannot influence the wireless power supply effect. The magnetic field intensity generated by the sending coil is higher at the position closer to the sending coil, so the thickness of the energy transfer area is not too large, and the wireless power supply effect is prevented from being influenced because the oscillating magnetic field intensity at the position of the receiving coil is too small and induced voltage cannot be induced. I.e., the thickness of the energy transfer region, is preferably as small as possible based on the thickness of the spacer. For example, the insulating material of the energy transfer region may be 5mm thick, which may achieve the isolation performance requirement of 18KV with a large margin to accommodate fluctuations in the circuit. Meanwhile, the thickness does not have great influence on the wireless power supply effect.

According to the technical scheme, the electrical components in the high-voltage area and the low-voltage area can be installed, fixed and electrically isolated through the insulation fixing piece in the embodiment. By using insulation material isolation instead of air insulation isolation, better isolation performance can be obtained at smaller spatial distances. Meanwhile, because a magnetic core in a traditional power supply unit is removed and a PCB carved coil is used as a sending coil and a receiving coil, the internal shape of the detection module is regular, the design difficulty during air gap insulation is reduced, and a large amount of space can be released when the detection module is used in PFE equipment in a large amount.

In the above embodiment, the power supply unit adopts a wireless power supply mode, and energy transfer in the wireless power supply mode is performed by a spatial coupling mode, so in order to realize the spatial coupling, the power supply unit further includes a Pulse Width Modulation (PWM) generator. The PWM generator may be disposed in a low voltage region for generating an ac driving voltage. The PWM generator is connected to the transmitting coil to supply a driving voltage to the transmitting coil.

When the transmitting coil is supplied with a resonance voltage, a periodically varying magnetic field can be generated in the space around the coil according to the magnetic effect of the current. The changing magnetic field can electromagnetically induce with the receiving coil, thereby inducing an induced voltage in the receiving coil and forming a voltage and a current. Wherein, the change frequency of the magnetic field generated by the transmitting coil is related to the frequency of the driving voltage supplied by the PWM generator, so that the change frequency of the induced voltage induced in the receiving coil is also related to the frequency of the driving voltage supplied by the PWM generator, and the energy transfer is realized.

After the receiving coil induces the induced voltage, the induced voltage can be processed, for example, the induced voltage of alternating current is converted into direct current usable by the detecting unit. For this reason, the power supply unit further comprises a power management circuit, wherein the power management circuit is arranged in the high-voltage area and connected with the receiving coil and used for converting the induced voltage induced by the receiving coil into a standard voltage suitable for the detection unit.

Because the sending coil and the receiving coil can be provided with different overlapping area according to the size of the sending coil and the receiving coil. And the larger the overlapping area of the transmitting coil and the receiving coil is, the higher the efficiency of wireless power supply is. In order to obtain better power supply effect, the sending coil and the receiving coil can have the same structure, so that the voltage supplied in the low-voltage area can be directly converted into a specific value, and the processing of a power management circuit is facilitated.

For example, a 12V dc power is supplied to the PWM generator in a low voltage region. The PWM generator may convert the 12V dc power into a driving voltage with a specific frequency variation according to a set conversion manner, thereby supplying the converted ac power to the transmitting coil to form a magnetic field with the same frequency variation. The receiving coil induces induced voltage through the change of the magnetic field intensity, and the induced voltage is reduced into 12V direct current by the power management circuit and is supplied to the detection unit for use. When the transmitting coil and the receiving coil have the same structure and are completely overlapped, the power management circuit can restore the induced voltage by adopting an algorithm opposite to that of the PWM generator so as to obtain the power supply voltage with a specific value.

In order to convert the induced voltage into a dc supply voltage, a rectifier, a filter, etc. may be included in the power management circuit. Since a certain deviation exists between the voltage induced in the receiving coil and the voltage forming the magnetic field in the transmitting coil in consideration of the influence of the factors such as the transmission efficiency and the structural deviation, a device such as a transformer for calibrating the induced voltage may be further provided in the power management circuit. In addition, the power management circuit can manage the generated standard voltage supply line so as to supply power to each component in the detection unit.

The detection unit can drive the sensor to work after receiving the standard voltage supplied by the power supply unit, so as to detect and sample the running state information in the high-voltage area. Therefore, the detection unit comprises a sampling circuit connectable to the power management circuit to obtain a supply voltage of the standard voltage value from the power management circuit. The sampling circuit can convert and process the detected signal and send the signal to the control unit to participate in the overall power supply control of the submarine cable power supply equipment. The control unit may be arranged in a low-pressure area, i.e. a low-pressure control unit. And the sampling circuit is in communication connection with the sampling circuit so as to receive the running state information acquired by the sampling circuit, namely, an optical transmission unit is arranged in the high-voltage area, and the sampling circuit is connected with a low-voltage control unit through the optical transmission unit.

Wherein, converting and processing the signal collected by the sampling circuit may include: modulus conversion, electro-optic conversion treatment and the like. Thus, the sampling circuit includes a sensor, an analog to digital converter (ADC), a signal processor, and a fiber optic transmitter. The sensor, the AD converter, the signal processor and the optical fiber transmitter are respectively connected with the power management circuit so as to obtain power supply from the power management circuit.

The sensor is connected with the optical fiber transmitter through the AD converter and the signal processor in sequence, so that the detected running state information is converted into a digital signal and then is transmitted to the low-voltage control unit through the optical fiber transmitter. In the detection process, the sensor can detect physical quantity in the high-voltage area, convert information such as current, voltage, temperature and the like into an electric signal and send the electric signal to the AD converter. The AD converter may convert an analog signal detected by the sensor, convert the analog signal into a digital signal, and transmit the obtained digital signal to the signal processor.

The signal processor may process the received digital signal and convert the digital signal into a signal form that may be sent to the control unit. Such as converting digital signals into optical signals and feeding the optical signals to an optical fiber transmitter for transmission. The optical fiber transmitter can be connected to the low-voltage control unit through an optical fiber, so that an optical signal is transmitted to the low-voltage control unit, and the detection and the transmission of the running state information are completed. The optical fiber transmission operating state information has high transmission efficiency, and the optical fiber is made of a semiconductor or an insulator, so that the influence of the optical fiber transmission operating state information on the isolation performance of the high-voltage area and the low-voltage area is small, and the whole isolation performance of the detection module is guaranteed.

According to the technical scheme, the detection module provided by the embodiment can adopt a wireless power supply energy transfer mode and a PCB (printed Circuit Board) coil carving mode to transfer energy, isolated power supply of the detection unit is realized, and the insulating fixing piece is formed by using an insulating material, so that electric isolation between a high-voltage area and a low-voltage area is ensured while electric energy is provided for the detection module. The detection module can meet the requirement of voltage isolation power supply of more than 18kV on the premise of smaller space usage amount, and is simple in process, small in size, low in cost and easy to manufacture and install. In addition, the circuit is completely arranged in the module, the outside of the module is wrapped by insulating materials, the interference of the external environment to the inside of the module is reduced while the safety is ensured, and the collected running state information is more accurate, comprehensive and flexible.

Based on the above detection module, as shown in fig. 8, in some embodiments of the present application, there is further provided a submarine cable power supply apparatus, including a freewheeling module, an output monitoring device, a submarine cable access module, and a plurality of converters. The converter can convert the power supply voltage, such as converting a low voltage of-48V into 3000V for output. For a long-distance transmission submarine cable system, a plurality of converters can be connected in series for gradual conversion, so that the final total output voltage reaches a higher value. For example, by connecting 6 converters in series, the final total output voltage reaches 18 kV.

To achieve a series output of multiple converters, the multiple converters may be connected in series followed by a freewheel module to form a total output voltage and current in the freewheel module. The follow current module is connected with the submarine cable access module through the output monitoring device so as to transmit high voltage to the submarine cable access module. The submarine cable access module can be provided with a submarine cable line interface, and one or more submarine cable lines can be connected to the submarine cable access module through the submarine cable line interface, so that electric quantity supply can be obtained through the submarine cable access module.

When the follow current module transmits electric energy to the submarine cable access module, the transmitted electric energy can be controlled and adjusted through the output monitoring module. For example, the voltage value, the current value and the output state output by the freewheeling module are detected, and whether the current submarine cable power supply equipment has an abnormal working condition or not and whether the power supply in the current running state can meet the requirements of the submarine cable line or not are determined according to the detection result. When the abnormal condition appears, the output monitoring module can automatically adjust for the abnormal condition, for example, when the output voltage can not meet the power supply requirement of the submarine cable line, the total output voltage is further improved by adjusting the number of the converters connected into the follow current module, so that the power supply requirement of the submarine cable line is met.

Since the submarine cable line is a constant current supply system, the submarine cable line can maintain a constant current supply regardless of the number of electrical components in the submarine cable line. Therefore, the output monitoring device can also monitor the current value of the submarine cable line in real time, so that when the submarine cable line is used for increasing or decreasing electrical equipment, the current in the submarine cable line can be kept constant by adjusting the power supply voltage. In addition, the output monitoring device can also perform early warning on the abnormal state of the submarine cable power supply equipment by detecting the running state information. For example, the output monitoring device can also detect the internal temperature of the submarine cable power supply equipment, judge the detected temperature value, and generate an alarm signal when the temperature exceeds a preset alarm threshold value, so as to realize abnormal state early warning.

In order to realize the monitoring of the output electric energy, the output monitoring device may further be provided with the detection module provided in the above embodiment. The output monitoring device is internally provided with a detection module, the detection module comprises a high-voltage area and a low-voltage area, a detection unit is arranged in the high-voltage area, and the detection unit is used for collecting running state information such as voltage, current and temperature. The detection module further comprises a power supply unit arranged between the high-voltage area and the low-voltage area and used for obtaining electric energy from the low voltage and transmitting the electric energy to the acquisition unit positioned in the high-voltage area.

Wherein, the power supply unit includes receiving coil and transmitting coil. The receiving coil is arranged in the high-voltage area, and the transmitting coil is arranged in the low-voltage area, so that the transmitting coil and the receiving coil form space coupling to supply power to the acquisition unit.

In the process of monitoring the output electric energy by the output monitoring device, the detection module can realize isolated power supply by utilizing the spatial coupling effect between the sending coil and the receiving coil, so that the detection unit starts to work and detects related running state information in a high-voltage area. The detection unit sends the detected running state information to a control unit in the output monitoring device, so that the control unit can adjust the electric energy output state according to the running state information.

Because the power supply unit of the detection module adopts a space coupling energy transmission mode, large-volume special-shaped structural parts such as a magnetic core and the like are not needed, the size of the power supply unit can be reduced on the premise of ensuring the isolation requirement, and then the whole size of the detection module is reduced. That is, the detection module does not occupy too much internal space of the output monitoring device, which is convenient for designing the internal element layout of the output monitoring device. In addition, the detection module occupies a small space, so that the detection modules can be arranged at multiple positions, and the control precision of the output monitoring device is improved.

In an exemplary embodiment, in order to realize the closed-loop control adjustment of the converter, a built-in detection module may be further included in the converter, that is, the converter may detect the operation state information during the conversion process through the built-in detection module, so as to adjust the voltage conversion state according to the operation state information, thereby completing the closed-loop adjustment of the converter. Because the converter also has a high-voltage area and a low-voltage area and has limited internal space, the detection module is arranged in the converter, so that the detection of the running state information can be completed under the condition of small space occupation, and a good electrical isolation effect is obtained.

In an exemplary embodiment, the submarine cable power supply apparatus further comprises a test load device. The load testing device can be provided with a load module with an adjustable numerical value, and can simulate the load state in the submarine cable line after the load testing device is connected with the follow current module, so that debugging and load capacity detection are performed before the submarine cable power supply equipment formally supplies power to the submarine cable line. Therefore, the test load device may be provided with the detection module. In a similar way, the detection module does not occupy too much internal space of the output monitoring device, and is convenient for the element arrangement of the output monitoring device, so that the test load device has smaller volume on the premise of meeting the preset performance requirement.

It should be noted that, in the control process of the converter, the output monitoring device and the load testing device, control units, such as control circuits composed of a built-in processor and a memory, may be respectively arranged in the converter, the output monitoring device and the load testing device, and the control is completed by the respective control units; the control unit may be provided only in the output monitoring device, and the test modules in the converter, the output monitoring device and the load test device are uniformly connected to the control unit in the output monitoring device and are uniformly controlled by the control unit in the output monitoring device.

The processor can call the corresponding control program from the memory and control the power supply state by executing the control program. The processor may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP. The processor may also further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof.

The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

The memory may include volatile memory, such as random-access memory (RAM); the memory may also include non-volatile memory, such as read-only memory (ROM), flash memory, a hard disk, or a solid state disk; the memory may also comprise a combination of the above kinds of memories.

According to the technical scheme, the submarine cable power supply equipment provided by the embodiment of the application can be internally provided with a plurality of detection modules in the converter, the output monitoring device and the load testing device respectively. The power supply unit of the detection module supplies power to the detection unit of the high-voltage area in a space coupling mode, so that the power supply effect is realized, the electrical isolation requirement is met, the whole volume is reduced, the submarine cable power supply equipment can be provided with the detection modules at multiple positions, and the detection precision is improved on the premise of not increasing the whole volume.

In one exemplary embodiment, a converter is also provided, which includes a voltage conversion module and the above-mentioned detection module. The voltage conversion module can perform conversion processing on the input voltage to obtain a high voltage capable of supplying power to the submarine cable line. The detection module can detect the running state information of the high-voltage area in the converter and feed the detected running state information back to the control unit so as to control the working state of the converter.

In one exemplary embodiment, an output monitoring device is also provided, which includes a control unit and the above-mentioned detection module. The detection module can detect the running state information of a high-voltage area in the output monitoring device and sends a detection result to the control unit, so that the control unit controls and adjusts the working state of the whole submarine cable power supply equipment according to the running state information detection result.

In one exemplary embodiment, a load testing device is also provided, which includes a load module and the above-mentioned detection module. The load module is used for simulating the load state of the submarine cable line, and the detection module can detect the operation state information such as voltage, current and temperature in the load testing device after the load testing device is connected to the follow current module of the submarine cable power supply equipment, and sends the detection result to the control unit, so that the control unit can calculate the load simulation result according to the operation state information and adjust the power supply mode in real time according to the load simulation result.

It will be apparent to those skilled in the art that various changes and modifications can be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A detection module is characterized by comprising a high-pressure area and a low-pressure area, wherein a detection unit is arranged in the high-pressure area and is configured to collect operation state information; the detection module further comprises a power supply unit, and the power supply unit is connected with the acquisition unit to supply power to the acquisition unit;

wherein the power supply unit comprises a receiving coil and a transmitting coil; the receiving coil is arranged in the high-voltage area, and the transmitting coil is arranged in the low-voltage area so as to form spatial coupling through the transmitting coil and the receiving coil and supply power to the acquisition unit.

2. The detection module of claim 1, wherein the power supply unit further comprises an insulating fixture; the insulating fixture is disposed between the receive coil and the transmit coil to electrically isolate the high voltage region from the low voltage region.

3. The sensing module of claim 2, wherein the insulating fixture is a box structure slotted at both ends to form a high voltage region mounting slot and a low voltage region mounting slot in the insulating fixture; the high-pressure area mounting groove is used for accommodating the detection unit and the receiving coil; the low voltage region mounting groove is for accommodating the transmitting coil.

4. The detection module of claim 3, wherein an energy transfer region is provided between the high pressure region mounting slot and the low pressure region mounting slot; the receiving coil is arranged on one side, close to the high-voltage area mounting groove, of the energy transfer area, and the transmitting coil is arranged on one side, close to the low-voltage area mounting groove, of the energy transfer area.

5. The detection module of claim 4, wherein the thickness of the energy transfer region is greater than an isolation thickness, the isolation thickness being a minimum separation distance calculated from a voltage difference between the high voltage region and the low voltage region under the insulating material of the insulating fixture.

6. The detection module of claim 1, wherein the power supply unit further comprises a Pulse Width Modulation (PWM) generator; the PWM generator is arranged in the low-voltage area and is connected with the sending coil; the PWM generator is configured to supply a driving voltage to the transmitting coil.

7. The detection module of claim 1, wherein the power supply unit further comprises a power management circuit; the power management circuit is arranged in the high-voltage area and is connected with the receiving coil;

the power management circuit is configured to convert an induced voltage induced by the receiving coil into a standard voltage suitable for the detection unit.

8. The detection module of claim 7, wherein the detection unit comprises a sampling circuit, the sampling circuit being connected to the power management circuit;

a low-voltage control unit is arranged in the low-voltage area, and an optical transmission unit is arranged in the high-voltage area; the sampling circuit is connected with the low-voltage control unit through the optical transmission unit so as to send collected running state information to the low-voltage control unit.

9. The detection module of claim 8, wherein the sampling circuit comprises a sensor, an AD converter, a signal processor, and a fiber optic transmitter; the sensor, the AD converter, the signal processor and the optical fiber transmitter are respectively connected with the power management circuit;

the sensor is connected with the optical fiber transmitter through the AD converter and the signal processor in sequence, so that the detected running state information is converted into a digital signal and then is transmitted to the low-voltage control unit through the optical fiber transmitter.

10. The detection module of claim 1, wherein the transmitting coil and the receiving coil are PCB-scribed coils.

11. A submarine cable power supply device is characterized by comprising a follow current module, an output monitoring device, a submarine cable access module and a plurality of converters;

the converters are connected in series and then connected with the follow current module; the follow current module is connected with the submarine cable access module through the output monitoring device; the detection module of any one of claims 1-10 is included in the converter and the output monitoring device.

12. A submarine cable power supply according to claim 11, further comprising a test load device connected to the freewheel module, the test load device having the detection module built therein.