CN116505338B - High-voltage release protection device and submarine cable power supply system - Google Patents
High-voltage release protection device and submarine cable power supply system Download PDFInfo
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- CN116505338B CN116505338B CN202310735377.0A CN202310735377A CN116505338B CN 116505338 B CN116505338 B CN 116505338B CN 202310735377 A CN202310735377 A CN 202310735377A CN 116505338 B CN116505338 B CN 116505338B
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- 239000002184 metal Substances 0.000 claims description 41
- 229910052751 metal Inorganic materials 0.000 claims description 41
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- 238000000034 method Methods 0.000 abstract description 8
- 238000002955 isolation Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 description 18
- 230000005611 electricity Effects 0.000 description 17
- 238000004891 communication Methods 0.000 description 12
- 238000009413 insulation Methods 0.000 description 11
- 239000011810 insulating material Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229930040373 Paraformaldehyde Natural products 0.000 description 2
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- 229920006324 polyoxymethylene Polymers 0.000 description 2
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- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/502—Bases; Cases composed of different pieces
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/08—Short-circuiting members for bridging contacts in a counterpart
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/04—Constant-current supply systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Cable Accessories (AREA)
- Electric Cable Installation (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The application discloses a high-voltage discharge protection device and a submarine cable power supply system, wherein the device comprises a cable interface, a short circuit assembly and a shell, wherein the shell is an insulating shell with a cavity, and the cable interface and the short circuit assembly are arranged in the cavity; the cable interface comprises a high-voltage interface and a first ground wire interface which are arranged on the inner wall of the shell; the short circuit assembly comprises a short circuit sheet and a linkage rod, one end of the short circuit sheet is in sliding connection with the linkage rod, and the other end of the short circuit sheet is hinged with the inner wall of the shell; the high-voltage interface and the first ground wire interface are arranged on the same side of the short-circuit piece at intervals, and the hinge positions of the cable interface and the short-circuit piece on the inner wall of the shell are on the same straight line. Through set up the short joint piece that can follow the rotation of articulated position in the casing, can be with high-voltage interface short circuit in rotatory in-process, realize the protection of releasing to the remote power supply system. Because the short circuit piece which rotates and moves does not need extra push-pull space, the whole volume of the discharge protection device can be reduced on the premise of meeting the isolation requirement.
Description
Technical Field
The application relates to the technical field of submarine cable power supply systems, in particular to a high-voltage discharge protection device and a submarine cable power supply system.
Background
The remote power supply system (Power Feeding Equipment, PFE) is a dc power supply system that can safely convert a low voltage of-48V to a high voltage of 18kV to power subsea equipment in a submarine cable communication system. The remote power supply system is provided with a plurality of converters, an output monitoring device and a test load device, and the devices can convert and regulate the power supply voltage so as to output constant-current electric energy.
In order to make the remote power supply system operate normally, maintenance and inspection work such as polarity replacement and PFE maintenance needs to be performed regularly. In the process of maintenance and inspection work, power supply is required to be stopped, and the leakage protection is required when the power supply is stopped because the power supply distance of a remote power supply system is long, so that the influence of residual voltage in a submarine cable is reduced.
The bleed protection may short the High Voltage (HV) end of the remote power supply system to an Ocean Ground (OG) device via a shorting tab to protect the remote power supply system from residual voltages in the Ocean cable supply. However, as the short circuit piece needs to be operated by maintenance personnel, the state of the short circuit piece cannot be obtained, and other components connected with the short circuit piece need to be insulated from the high voltage end at high voltage, the whole volume of the device capable of carrying out the relief protection is large, and the space management in the case is not facilitated.
Disclosure of Invention
The application provides a high-pressure release protection device, which aims to solve the problem that the overall size of the release protection device is large.
According to a first aspect of an embodiment of the present application, there is provided a high voltage bleed protection device comprising a cable interface, a shorting assembly and a housing, wherein: the shell is an insulating shell with a cavity, and the cable interface and the short circuit component are arranged in the cavity; the cable interface comprises a high-voltage interface and a first ground wire interface, the high-voltage interface and the first ground wire interface are arranged on the inner wall of the shell, and the high-voltage interface and the first ground wire interface are arranged at intervals; the short circuit assembly comprises a short circuit sheet and a linkage rod, wherein the short circuit sheet is of a strip-shaped sheet structure made of a conductor material; one end of the short tab is in sliding connection with the linkage rod, and the other end of the short tab is hinged with the inner wall of the shell; the high-voltage interface and the first ground wire interface are arranged on the same side of the short joint piece, and the high-voltage interface and the first ground wire interface are positioned on the same straight line with the hinge position of the short joint piece on the inner wall of the shell.
The high-voltage interface and the first ground wire interface in the cable interface are respectively connected with a high-voltage output end cable and a marine grounding end cable in a remote power supply system, the short-circuit piece can rotate along the hinge position of the short-circuit piece and the inner wall of the shell, and the high-voltage interface and the first ground wire interface are arranged on the rotating path of the short-circuit piece. The short circuit piece can be rotated to the positions of the high-voltage interface and the first ground wire interface after the remote power supply system is powered down, so that the two interfaces are short-circuited, high-voltage residual electricity in the submarine cable power supply circuit is discharged to the grounding device, and the remote power supply system is protected. Meanwhile, compared with the first ground wire interface and the high-voltage interface which are arranged in parallel with the short circuit piece, the problems of creepage distance and the like are not needed to be considered between the conductor connected with the ground wire with lower potential and the short circuit piece, so that the high-voltage interface and the first ground wire interface which are obliquely arranged can reduce the length and the height of the shell after meeting the conditions of creepage distance, electric gap and the like, and the aim of reducing the whole volume of the device is achieved.
In an alternative embodiment, the cable interface further includes a second ground wire interface, where the second ground wire interface is disposed on an inner wall of the housing, the second ground wire interface is disposed at an interval to the high voltage interface, and the second ground wire interface is disposed on the same straight line as the high voltage interface and the first ground wire interface. In order to improve the efficiency of the surplus electricity of high pressure and release, improve the security of carrying out surplus electricity and releasing simultaneously, still include in the cable interface and be the second ground wire interface that a straight line set up with high pressure interface and first ground wire interface, the short circuit piece can be simultaneously with second ground wire interface connection when short circuit high pressure interface and first ground wire interface, make the surplus electricity of part in the sea cable power supply line carry out the release through the ground wire with second ground wire interface connection.
In an alternative embodiment, the high-voltage interface, the first ground wire interface and the second ground wire interface are respectively provided with a metal clamping piece on one side opposite to the short circuit piece, and the metal clamping pieces are used for clamping the short circuit piece. The metal clamping piece can clamp the short-circuit piece when the short-circuit piece rotates to the connection position with different cable interfaces, so that the falling risk of the cable interfaces and the short-circuit piece is reduced, and the connection stability between the submarine cable power supply circuit and the ground wire is improved.
In an alternative embodiment, the housing includes an interface housing, where the interface housing covers the high-voltage interface, the first ground wire interface, and the second ground wire interface, and a through hole is formed in the interface housing, and the metal clip is connected to the submarine cable line through the through hole. The interface shell is covered on the cable interfaces to isolate different cable interfaces, so that the influence of the high-voltage interface on other interfaces is reduced.
In an alternative embodiment, an insulation protrusion is arranged between the high-voltage interface and the first ground wire interface, and an insulation protrusion is arranged between the high-voltage interface and the second ground wire interface. The insulation protrusion is used for increasing the creepage distance between the high-voltage interface and other conductors, and when the device is in an inactive state, the high-voltage current in the high-voltage interface is relieved from being transmitted to the conductors such as the first ground wire interface and the second ground wire interface through the insulation surface.
In an alternative embodiment, the shorting assembly further comprises a proximal ground wire, the proximal ground wire being connected to the shorting tab. The short connecting piece is also provided with a ground wire, and when the high-voltage interface is connected with the first ground wire interface, the ground wire is used for providing grounding protection for the high-voltage discharge protection device.
In an alternative embodiment, a chute is arranged at one end of the short joint sheet, which is in sliding connection with the linkage rod, and a sliding block is arranged at one side of the linkage rod, which is in sliding connection with the short joint sheet; the sliding block is clamped in the sliding groove. The short joint piece passes through the spout and sets up the slider joint on the gangbar, and short joint piece and gangbar sliding connection can drive the short joint piece through the operation gangbar and rotate thereby short circuit high-voltage interface.
In an alternative embodiment, the device further comprises an operation handle, one end of the operation handle is connected with the linkage rod, and the other end of the operation handle extends out of the shell. The operation handle is arranged to facilitate the operation of the linkage rod and even the short tab by the maintainer outside the shell, the distance between the short tab and the maintainer is increased, and the safety risk is reduced.
In an alternative embodiment, one end of the linkage rod, which is in sliding connection with the short circuit piece, is coated with an insulating piece; the linkage rod is hinged with the shell, and the hinged position of the linkage rod and the shell is located between the insulating piece and the operating handle. Through setting up the insulating part can prevent that the short-circuit piece from transmitting to the gangbar in the surplus electricity of high pressure behind the short-circuit high voltage interface, the gangbar is articulated with the casing simultaneously, makes the gangbar also can follow articulated position rotation and drive the short-circuit piece rotatory to carry out the short circuit to the high voltage interface.
In an alternative embodiment, the shell is further provided with a first limit switch and a second limit switch, and the first limit switch and the second limit switch are arranged on one side of the linkage rod; the first limit switch is opposite to the second limit switch and is obliquely arranged, the first limit switch is used for detecting normal state position information of the linkage rod and limiting the rotation range of the linkage rod together with the second limit switch, and the second limit switch is used for detecting working state position information of the linkage rod and limiting the rotation range of the linkage rod together with the first limit switch. The first limit switch and the second limit switch are used for limiting the rotation angle range of the linkage rod, and the short circuit piece can be driven to rotate due to the rotation of the linkage rod, so that the first limit switch and the second limit switch can also limit the rotation range of the short circuit piece, and meanwhile, position signals can be output when the short circuit piece reaches the limit position so as to represent the working state of the device.
According to a second aspect of the embodiment of the present application, there is provided a submarine cable power supply system, which includes a remote power supply system, a marine grounding device, and a site grounding device, where the submarine cable power supply system further includes the high-voltage discharge protection device provided in the first aspect, a high-voltage output end in the remote power supply system is connected to the high-voltage interface, and a marine ground wire in the marine grounding device is connected to the first ground wire interface, where the high-voltage discharge protection device is used to short-circuit the high-voltage output end and the ground wire to protect the remote power supply system when the remote power supply system is in a powered-down state.
According to the technical scheme, the application provides a high-voltage discharge protection device and a submarine cable power supply system, wherein the device comprises a cable interface, a short circuit assembly and a shell, the shell is an insulating shell with a cavity, and the cable interface and the short circuit assembly are arranged in the cavity; the cable interface comprises a high-voltage interface and a first ground wire interface which are arranged on the inner wall of the shell; the short circuit assembly comprises a short circuit sheet and a linkage rod, wherein the short circuit sheet is of a strip-shaped sheet structure made of a conductor material, one end of the short circuit sheet is in sliding connection with the linkage rod, and the other end of the short circuit sheet is hinged with the inner wall of the shell; the high-voltage interface and the first ground wire interface are arranged on the same side of the short joint piece at intervals, and the high-voltage interface and the first ground wire interface are positioned on the same straight line with the short joint piece at the hinging position of the inner wall of the shell. Through set up the short-circuit piece that can follow the articulated position rotation in the casing, can carry out the short circuit with high voltage interface and first ground wire interface at rotatory in-process, realize the protection of releasing to the remote power supply system. Because the short tab moving through rotation does not need extra push-pull space, the whole volume of the release protection device can be reduced on the premise of meeting the isolation requirement.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic illustration of a vent apparatus;
fig. 2 is a schematic perspective view of a high-pressure relief protection device in a reset state according to an embodiment of the present application;
FIG. 3 is a schematic view of a high-voltage bleeder protection device in a reset state according to an embodiment of the present application;
FIG. 4 is a schematic view of a high-pressure relief protection device in an operating state according to an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating an arrangement of cable interfaces according to an embodiment of the present application;
FIG. 6 is a side view of an interface housing according to an embodiment of the present application;
fig. 7 is a schematic diagram of a submarine cable power supply system connected to a high-voltage discharge protection device according to an embodiment of the present application.
Illustration of: 1-a cable interface; 2-shorting the assembly; 3-a housing; 11-high voltage interface; 12-a first ground wire interface; 13-a second ground connection; 14-metal clips; 21-a shorting tab; 22-linkage rod; 23-proximal ground; 31-an interface housing; 32-a first limit switch; 33-a second limit switch; 211-a chute; 221-a slider; 222-insulator.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the application. Merely exemplary of apparatus and methods consistent with some aspects of the application as set forth in the claims.
In the embodiment of the application, the submarine cable system, namely the submarine 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 sea floor and may therefore be referred to as sea lines. The submarine cable line can transmit optical communication signals between the end stations, so that a communication function of a cross-sea area is realized. Submarine cable systems may enable long-range communications, for example, data communications may be accomplished across tens of thousands of kilometers of the ocean. It should be noted that the submarine cable system in the embodiment of the present application may also be used in relatively short-distance communication areas such as river crossing and lake crossing.
In order to provide optical and electrical signals for underwater equipment in the submarine cable system, an end station is arranged at the receiving and transmitting end of the submarine cable system. The end station is a base station in the submarine cable system and is used for forwarding, controlling and adjusting the transmitted signals so as to maintain the normal communication of the submarine cable system. Meanwhile, the terminal station can also perform maintenance operations such as power supply, overhaul and control strategy modification on the submarine cable lines so as to ensure the normal operation of the communication function. The sea cable line is laid in a cross-sea manner, the head end of the sea cable line can be fixed in the coast or the sea, the rest sea cable line is pulled through the sea transportation equipment, and finally the tail end of the sea cable is anchored at a designated position.
A plurality of underwater electrical devices may be provided on the submarine cable, which may be powered by power supply equipment in an end station connected to the submarine cable to maintain proper operation of the underwater electrical devices. The power supply equipment in the end station may be a remote power supply system (Power Feeding Equipment, PFE) capable of converting a-48V voltage to a high voltage of up to 18kV to power subsea equipment in the submarine cable system. As a device for supplying high-voltage power, PFE needs to perform maintenance work such as power-down maintenance and polarity replacement periodically, so that problems such as power failure due to PFE are reduced. However, in order to protect the safety of equipment and maintenance personnel in the maintenance process, the power-down treatment of the PFE is required in the maintenance work, and at this time, the high-voltage residual power in the submarine cable power supply line still threatens the safety of the equipment and the maintenance personnel, and the high-voltage residual power in the power supply line needs to be discharged.
In order to release the high-voltage residual electricity, so as to protect the safety of the PFE and maintenance personnel, as shown in fig. 1, when the residual electricity is required to be released, a push-pull device formed by a spring and a handle drives a short circuit piece to move, and the high-voltage end HV and the ocean ground wire OG are in short circuit, so that the residual electricity is released to protect the PFE. When the residual electricity is not discharged, the push-pull device is restored through the stop block, and the contact between the short tab and the high-voltage end HV and the ocean ground wire OG is disconnected, so that the PFE can normally supply power to the ocean cable system.
However, since PFE can generate a voltage signal up to 18kV, high voltage insulation of the high voltage terminal HV from surrounding conductors, such as shorting tabs, OG, etc., is required to reduce electrical safety risks when no residual current is discharged. Illustratively, according to the IEC-62368 safety standard, an 18kV electrical gap is insulated on the basis of: 30mm; reinforced insulation: 52.2mm; the 18kV creepage distance is 180mm (pollution grade: 2; material grade: 3); 18kV creepage distance: 71.5mm (contamination grade: 1; material grade: 3). Therefore, in order to protect equipment and maintenance personnel, the creepage distance and the electric clearance between the HV and the handles, the OG and the short contact plates in the release protection device should meet the standard to reduce the electric safety risk, but the arrangement increases the distance between the components, thereby increasing the whole volume of the device, occupying 8U in the case of the end station, and occupying a module with the height of about 356mm, thereby having the problems of larger occupied space and being unfavorable for the layout of other electric equipment.
In order to reduce the volume of the relief protection device, some embodiments of the present application provide a high voltage relief protection device, as shown in fig. 7, which may be used in a submarine cable power supply system to provide power-down protection for the PFE. In the embodiment of the application, the submarine cable power supply system is used as the application scene of the high-voltage discharge protection device, but the high-voltage discharge protection device provided by the embodiment is not limited to be applied to the submarine cable power supply system, and can be applied to other power supply systems to protect power supply equipment and save the internal space of the equipment.
As shown in fig. 2 to 4, the high-voltage leakage protection device in the embodiment of the application includes a cable interface 1, a shorting assembly 2 and a housing 3, wherein the housing 3 is an insulating housing with a cavity, the housing 3 may be in a rectangular parallelepiped structure, and the cable interface 1 and the shorting assembly 2 are disposed in the cavity. The housing 3 is a means for protecting the internal electrical equipment, and the high-voltage discharge protection device can be installed in the cabinet of the power supply system through the housing 3. In some embodiments, for connection with HV and OG in the PFE, the outer wall of the housing 3 is further provided with a cable connected to the cable interface 1, or the outer wall of the housing 3 is provided with a hole capable of introducing a cable into the cable interface 1.
The kind of insulating material constituting the housing 3 is not limited in the present application, but it should be understood that there is a certain difference between insulating materials and insulating withstand voltages, and in order to enhance the isolation effect between the high voltage discharge protection device and other devices, the housing 3 needs to have a certain thickness to provide isolation and protection for the devices in the housing 3. The thickness of the housing 3 depends on the insulation voltage endurance capability of the insulation material constituting the housing 3 and the overall strength requirement of the housing 3, for example, when the housing 3 is made of a polyoxymethylene material, since the insulation voltage endurance capability of the polyoxymethylene material is 20kV/mm, and when the HV voltage is 18kV, the corresponding thickness of the housing 3 can provide sufficient insulation performance at 1mm, but the thickness of the housing 3 is thinner at this time, and cannot provide protection for internal devices, so that the thickness can be appropriately increased to improve the strength requirement of the housing 3.
The cable interface 1 comprises a high-voltage interface 11 and a first ground wire interface 12, the high-voltage interface 11 and the first ground wire interface 12 are arranged on the inner wall of the shell 3, and the high-voltage interface 11 and the first ground wire interface 12 are arranged at intervals. It will be appreciated that after the installation of the high voltage bleeder protection device is completed, it is necessary to connect with the cable in the power supply system, illustratively the high voltage interface 11 with the cable at the high voltage output of the PFE and the first ground connection 12 with the sea ground. In order to connect with the shorting assembly 2 in the working process, the high voltage interface 11 and the first ground wire interface 12 are exposed in space due to the fact that part of conductors are exposed in space, so that a certain distance is needed to be arranged between the high voltage interface 11 and the first ground wire interface 12, and the electric gap and the creepage distance between the high voltage interface 11 and the first ground wire interface 12 are guaranteed to meet the standard, and therefore electric safety is improved.
In some embodiments, the cable interface 1 further includes a second Ground wire interface 13, where the second Ground wire interface 13 is connected to a site Ground (BG), and when residual electricity is discharged, HV is shorted to OG and BG at the same time, so that the problem that the residual electricity is difficult to discharge due to a Ground fault can be alleviated, and meanwhile, the residual electricity discharge efficiency can be increased.
Meanwhile, the second ground wire interface 13 is also provided on the inner wall of the housing 3, as is the high-voltage interface 11 and the first ground wire interface 12. The second ground wire interface 13 is arranged at the same interval as the high-voltage interface 11, and the distance between the second ground wire interface 13 and the high-voltage interface 11 is the same as the distance between the first ground wire interface 12 and the high-voltage interface 11, so that insulation between conductors on the first ground wire interface 12 and the second ground wire interface 13 and conductors on the high-voltage interface 11 is ensured, and the conduction risk between the high-voltage interface 11 and the first ground wire interface 12 and/or the second ground wire interface 13 is reduced, so that the power supply stability of the PFE is improved.
The shorting assembly 2 is then a device for shorting HV to OG, in some embodiments HV may also be shorted to both OG and BG. Illustratively, the shorting assembly 2 includes a shorting tab 21 and a link rod 22, where the shorting tab 21 is a strip-shaped sheet structure made of a conductive material, which may be a metal material, such as iron, copper, or iron-nickel alloy, and the constituent materials of the shorting tab 21 are not limited in the present application.
In order to enable HV shorting, one end of the shorting tab 21 is slidably connected to the link lever 22, the other end of the shorting tab 21 is hinged to the inner wall of the housing 3, and the shorting tab 21 is rotatable along a position hinged to the housing 3. For example, a sliding groove 211 is formed at one end of the short link 21 slidably connected with the link 22, a sliding block 221 is formed at one side of the link 22 slidably connected with the short link 21, the sliding block 221 is clamped in the sliding groove 211, and the sliding block 221 slides in the sliding groove 211 and drives the short link 21 to rotate when the link 22 rotates, so that a maintainer can control the short link 21 to short the HV by operating the link 22 outside the housing 3. For example, maintenance personnel may short HV off residual electricity by operating linkage lever 22 after the PFE is powered down so that shorting tab 21 communicates HV and OG.
Since the short tab 21 can only rotate in one direction at the same time, and in order to reduce the space occupied by the high-pressure relief protection device, the high-pressure port 11 and the first ground wire port 12 are disposed on the same side of the short tab 21, and the high-pressure port 11 and the first ground wire port 12 are on the same straight line with the hinge position of the short tab 21 on the inner wall of the housing 3, so that the short tab 21 can communicate OG with HV when rotating in one direction. In some embodiments, if the cable interface 1 comprises the second ground interface 13, the short tab 21 is also able to communicate BG and HV when rotated to a position where OG and HV are communicated.
It should be understood that the high-voltage interface 11 and the first ground interface 12 arranged on the same line can connect the high-voltage interface 11 and the first ground interface 12 when the strip-shaped sheet-like short tab 21 is rotated to a certain angle, thereby connecting HV and OG to discharge surplus electricity. In some embodiments, the cable interface 1 includes a second ground wire interface 13, where the second ground wire interface 13 is aligned with the high voltage interface 11 and the first ground wire interface 12, that is, the second ground wire interface 13 is also aligned with the hinge position of the high voltage interface 11 and the short tab 21 on the inner wall of the housing 3. When the shorting tab 21 rotates to a certain angle, the high voltage interface 11, the first ground line interface 12, and the second ground line interface 13 can be connected, shorting HV for residual electricity bleed.
In order to facilitate the operations of residual electricity discharging and resetting the device outside the casing 3, in some embodiments, the high-voltage discharging protection device further includes an operating handle, one end of the operating handle is connected to the linkage rod 22, and the other end extends outside the casing, so as to facilitate the operation of maintenance personnel. Wherein, the operation handle can be made of insulating material, and the insulating material can insulate the short tab 21 from maintenance personnel, thereby improving the safety of the device.
In order to save space and achieve smooth communication, as shown in fig. 2, a straight line formed by the high-voltage interface 11, the first ground wire interface 12 and the second ground wire interface 13 is located in a quarter circle with the hinge position of the short circuit piece 21 on the inner wall of the housing 3 as a center and the length of the short circuit piece 21 as a radius, and the length of the straight line formed is smaller than the length of the short circuit piece 21.
In some embodiments, the first ground wire interface 12 and the second ground wire interface 13 are respectively disposed at two sides of the high voltage interface 11, and as can be seen from fig. 3, in the non-communicating state of the short tab 21, the first ground wire interface 12 is closest to the short tab 21, the second ground wire interface 13 is farthest from the short tab 21, and the distance between the high voltage interface 11 and the short tab 21 is centered. Since OG is in a low potential state, the distance between the first ground wire interface 12 and the shorting tab 21 may not be limited, but the distance between the high voltage interface 11 and the shorting tab 21 needs to meet the requirements of an electrical gap and a creepage distance.
In another embodiment of the present application, the first ground wire interface 12 and the second ground wire interface 13 are disposed on the same side of the high voltage interface 11, that is, the first ground wire interface 12 is closest to the short tab 21 and the second ground wire interface 13 is centered on the short tab 21 with the short tab 21 in a non-communicating state, and the high voltage interface 11 is farthest from the short tab 21. By providing the second ground connection 13 between the first ground connection 12 and the high-voltage interface 11, the distance between HV and the short tab 21 can be further increased, reducing the safety risk due to contamination and the like. The high voltage interface 11 may be disposed between the first ground wire interface 12 and the second ground wire interface 13, or may be disposed on the same side of the first ground wire interface 12 and the second ground wire interface 13, and in the description of other embodiments, a structure in which the high voltage interface 11 is disposed between the first ground wire interface 12 and the second ground wire interface 13 is used for description.
Since the short tab 21 cannot be directly connected to the power supply cable and the ground cable provided in the cable interface 1, in some embodiments, as shown in fig. 2, the high-voltage interface 11, the first ground wire interface 12, and the second ground wire interface 13 are provided with metal clips 14 on the sides opposite to the short tab 21, respectively, and when the short tab 21 is rotated to the positions of connection with the respective interfaces, the metal clips 14 can clamp the short tab 21, thereby connecting HV, OG, and BG to the short tab 21, respectively. The metal clip 14 is composed of two pieces of conductive metal in close contact, and when the shorting tab 21 is rotated to a position in contact with the metal clip 14, the shorting tab 21 is located between the two pieces of conductive metal, thereby being clamped to short HV. The material of the metal clip 14 in this embodiment may be the same as that of the shorting tab 21, and the material of the metal clip 14 may be different from that of the shorting tab 21, which is not limited in the present application.
It should be understood that, in order to enable the metal clips 14 on different interfaces to clamp the shorting tab 21 after the shorting tab 21 is rotated by a certain angle, the metal clips 14 on different interfaces are disposed on the same line and at the same level as the shorting tab 21.
Illustratively, the other portions of the shorting tab 21 except the portion that contacts each metal clip 14 are covered with a layer of insulating material to reduce the area of the exposed conductor with high voltage current on the shorting tab 21 during shorting HV, increase the safety of shorting, and provide better protection for PFE.
In some embodiments of the present application, in order to reduce the volume of the conductor exposed in the housing 3 when HV is connected to the high voltage interface 11 and increase the creepage distance between the metal clip 14 on the high voltage interface 11 and other conductors, the housing 3 may include an interface housing 31, where the interface housing 31 covers the high voltage interface 11, the first ground wire interface 12 and the second ground wire interface 13, respectively, so as to insulate the connection between HV, OG and BG and the interfaces and reduce the exposed conductors. Therefore, in the design process of the creepage distance, only the distance between the metal clip 14 on the high voltage interface 11 and other conductors needs to be considered.
It should be noted that, the sizes of the interface housings 31 covering different interfaces may be the same or different, and as shown in fig. 2, the size of the interface housing 31 covering the high-voltage interface 11 is larger than that of the other interface housings 31, which is only one possible embodiment of the present application, and the dimensional relationship of the interface housings 31 covering different interfaces is not limited in the present application.
In order to connect the metal clip 14 with the submarine cable line through the interface housing 31, the interface housing 31 is provided with a through hole, the metal clip 14 is connected with the submarine cable line through the through hole, for example, the metal clip 14 provided on the high voltage interface 11 is connected with HV through the through hole, the metal clip 14 provided on the first ground wire interface 12 is connected with OG through the through hole, and the metal clip 14 provided on the second ground wire interface 13 is connected with BG through the through hole.
In some embodiments, when the submarine cable routing is disposed in the interface housing 31, as shown in fig. 2, a securing member may be disposed on the interface housing 31, and when the submarine cable routing extends into the interface housing 31 and connects with the metal clip 14, the submarine cable routing is secured by the securing member, which is disposed on the opposite side of the interface housing 31 from the metal clip 14. The fixing member can fix the submarine cable line in the interface housing 31, reducing the risk of line drop, taking the case where the high-voltage interface 11 is disposed between the first ground wire interface 12 and the second ground wire interface 13, the fixing member disposed at the high-voltage interface 11 is used for fixing HV, the fixing member disposed at the first ground wire interface 12 is used for fixing OG, and the fixing member disposed at the second ground wire interface 13 is used for fixing BG.
It should be noted that, since the fixing member contacts with the submarine cable, particularly the HV, in order to reduce the volume of the high-voltage live conductor exposed outside the interface housing 31, the fixing member disposed on the high-voltage interface 11, that is, the fixing member contacting with the HV, needs to be made of an insulating material, and the material of the fixing member is not limited in the present application.
Illustratively, the creepage distance between conductors may also be increased by changing the shape of interface housing 31. As shown in fig. 5 and 6, the interface housing 31 may have a two-layer stepped structure, that is, a structure in which one large rectangular block is overlapped with one small rectangular block, and since the creepage distance is a distance between different conductors on the insulating surface, by providing the interface housing 31 having the above structure, the shortest path between different metal clips 14 on the insulating surface is increased, so that the creepage distance between the high voltage interface 11 and the first and second ground wire interfaces 12 and 13 can be increased, and the electrical safety of the high voltage bleeder protection device is improved.
For example, in order to satisfy the electrical gap and creepage distance between the metal clip 14 carrying the 18kV voltage signal and other metal clips 14, the interface housing 31 includes a first rectangular housing having a size of 30mm×30mm×40mm and a second rectangular housing having a size of 20mm×30mm×20mm, wherein the second rectangular housing is in contact with the housing 3, the width of the metal clip 14 is about 10mm, and is disposed at a position 10mm from the top of the first rectangular housing, and the metal clip 14 is disposed parallel to the top of the first rectangular housing, the distance between adjacent interface housings 31 is 45mm, and as can be seen from the size of the interface housings 31 and fig. 5 and 6, the distance between the metal clip 14 and the connection between the interface housing 31 and the housing 3 is 70mm, so that the creepage distance between the adjacent metal clip 14 is 185mm, and the creepage distance between the conductor carrying the 18kV high voltage signal and the adjacent conductor and the creepage distance between the adjacent conductor are satisfied, and the respective interface housings 31 are disposed obliquely with respect to the extending direction of the inner wall of the housing 3, so that the whole volume of the housing 3 can be reduced, the space occupied by the high voltage protection device can be made available in the sea cable system, and other layout devices can be made available.
Meanwhile, as the metal clamping piece 14 has a certain distance from the vertical direction of the inner wall of the shell 3 during arrangement, the hinge position of the shell 3 and the short connecting piece 21 is provided with a hinge post, and the arrangement height of the short connecting piece 21 is the same as that of the metal clamping piece 14 through the hinge post, so that the short connecting piece 21 can be connected with the metal clamping piece 14 after rotation. Illustratively, the shorting tab 21 may be hinged to the housing 3 at a hinge post position, and the shorting tab 21 may be rotated along the hinge position by operating the linkage rod 22.
In some embodiments, the creepage distance may also be increased by providing insulation protrusions on both sides of the high voltage interface 11. For example, an insulating protrusion is provided between the high voltage interface 11 and the first ground line interface 12, and an insulating protrusion is provided between the high voltage interface 11 and the second ground line interface 13. It should be understood that the height of the insulating protrusions is less than or equal to the set height of the metal clip 14 in order not to block the contact of the shorting tab 21 with the metal clip 14. The insulating protrusion may be made of the same insulating material as the housing 3, and integrally formed with the housing 3, or may be formed in other manners, and the shape, material and forming process of the insulating protrusion are not limited in the present application.
As shown in fig. 5 and 6, the creepage distance between the high voltage interface 11 and the first ground wire interface 12 and the second ground wire interface 13 can be increased by providing a loop-shaped protrusion on the interface housing 31. The protrusion can be integrally formed with the interface housing 31, and the height of the protrusion is smaller than the distance between the shorting position of the shorting tab 21 and the metal clip 14 when the shorting tab contacts the interface housing 31. It should be understood that the more the number of layers of the loop-shaped structure is, the more the creepage distance is increased, and the 3 layers shown in fig. 5 are only one possible embodiment of the present application, and the number of layers of the loop-shaped protrusions is not limited in the present application.
It should be noted that, the device connected to the high voltage circuit generally needs a grounding process to protect the safety of the user and the equipment, so in some embodiments, the shorting assembly 2 further includes a proximal ground wire 23, and the proximal ground wire 23 is connected to the shorting tab 21, so as to ground the shorting tab 21, thereby alleviating the safety of the device caused by the high voltage current in HV passing through the shorting tab 21. Illustratively, the proximal ground 23 may be connected at one end to the hinged location of the shorting tab 21 and the inner wall of the housing 3 and at the other end extend outside the housing 3 to connect to other ground devices in the ground bar or end station.
In some embodiments, the end of the linkage rod 22 slidably connected to the short tab 21 is covered with an insulating member 222, and the insulating member 222 is used to isolate the short tab 21 from the high voltage during the short circuit HV, and the insulating member 222 may be made of the same material as the housing 3. Meanwhile, in order to drive the short tab 21 to rotate, the linkage rod 22 is hinged with the shell 3, the hinged position of the linkage rod 22 and the shell 3 is located between the insulating piece 222 and the operating handle, and the linkage rod 22 can be controlled to rotate by taking the hinged position as the center through the operating handle, so that the short tab 21 is driven to rotate.
The link lever 22 may be hinged to the inner wall of the housing 3 by a bolt connection, and the link lever 22 may be rotated about the bolt when operated.
It should be understood that the high-pressure relief protection device needs to be installed in a chassis for use, and when a maintenance person performs an operation externally, the state in the housing 3 cannot be known, and the state of the current short tab 21 cannot be known. Therefore, in some embodiments, as shown in fig. 2 and 3, the housing 3 is further provided with a first limit switch 32 and a second limit switch 33, where the first limit switch 32 and the second limit switch 33 are electrically connected with the PFE, and when the first limit switch 32 or the second limit switch 33 is triggered, a trigger signal can be generated and transmitted to a lower computer through the electrical connection with the PFE, so that a maintenance person knows the state in the housing 3. Illustratively, the first limit switch 32 is used for detecting the normal state position information of the link lever 22 and limiting the rotation range of the link lever 22 together with the second limit switch 33, and the second limit switch 33 is used for detecting the operating state position information of the link lever 22 and limiting the rotation range of the link lever 22 together with the first limit switch 32.
The normal state position is a position where the link lever 22 is located when the short tab 21 is in the initial position, and the operating state position is a position where the link lever 22 is located when the short tab 21 is in the short state. Although the connection state between HV and OG, BG can be disconnected when the short tab 21 is disconnected from each conductor, there is a high voltage current in HV, so when the short tab 21 is not reset to the initial state, the distance between the short tab 21 and the high voltage interface 11 does not satisfy the requirement of the electrical gap, and there is a certain risk of breakdown. The current state of the linkage rod 22 is obtained through the limit switch, so that whether the high-voltage release protection device has an electrical safety risk can be known.
In order to limit the rotation angle of the linkage rod 22 and provide the state of the high-voltage release protection device for the PFE, the first limit switch 32 and the second limit switch 33 are arranged on one side of the linkage rod 22, the first limit switch 32 is opposite to the second limit switch 33 and is obliquely arranged, and when the linkage rod 22 rotates to the position of the first limit switch 32 or the second limit switch 33, the first limit switch 32 or the second limit switch 33 can be triggered, so that the limit switch sends an electric signal to the PFE.
As shown in fig. 7, some embodiments of the present application further provide a submarine cable power supply system, where the submarine cable power supply system includes a remote power supply system, a marine grounding device, and a station grounding device, and the PFE shown in fig. 7 is the remote power supply system, the OG is the marine grounding device, and the BG is the station grounding device. The submarine cable power supply system further comprises the high-voltage discharge protection device in the previous embodiment, the high-voltage output end in the remote power supply system is connected with the high-voltage interface 11, the ocean ground wire in the ocean grounding device is connected with the first ground wire interface 12, and the high-voltage discharge protection device is used for shorting the high-voltage output end and the ground wire to protect the remote power supply system when the remote power supply system is in a power-down state.
In some embodiments, the site ground wire in the site grounding device is connected with the second ground wire interface 13, so as to simultaneously communicate the high-voltage output end of the remote power supply system, the ocean ground wire and the site ground wire, improve the efficiency of residual electricity discharge, and improve the protection effect on the remote power supply system.
As can be seen from the above technical solution, the present application provides a high-voltage discharging protection device and a submarine cable power supply system, wherein the high-voltage discharging protection device includes a cable interface 1, a shorting assembly 2, and a housing 3, wherein the housing 3 is an insulating housing with a cavity, and the cable interface 1 and the shorting assembly 2 are disposed in the cavity; the cable interface 1 comprises a high-voltage interface 11 and a first ground wire interface 12 which are arranged on the inner wall of the shell 3; the short circuit assembly 2 comprises a short circuit sheet 21 and a linkage rod 22, wherein the short circuit sheet 21 is of a strip-shaped sheet structure made of conductor materials, one end of the short circuit sheet 21 is in sliding connection with the linkage rod 22, and the other end of the short circuit sheet 21 is hinged with the inner wall of the shell 3; the high-voltage interface 11 and the first ground wire interface 12 are arranged at the same side of the short-circuit piece 21 at intervals, and the high-voltage interface and the first ground wire interface 12 are on the same straight line with the hinge position of the short-circuit piece 21 on the inner wall of the shell 3. By providing a short tab 21 in the housing 3 which can be rotated along the hinge position, the high voltage interface 11 can be short-circuited with the first ground connection interface 12 during rotation, enabling a bleed protection of the remote power supply system. Since the short tab 21, which is moved by rotation, does not require an additional push-pull space, the entire volume of the bleeder protection device can be reduced while satisfying the isolation requirement.
The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.
Claims (11)
1. The utility model provides a high pressure protection device that leaks which characterized in that, includes cable interface, short circuit subassembly and casing, wherein:
the shell is an insulating shell with a cavity, and the cable interface and the short circuit component are arranged in the cavity;
the cable interface comprises a high-voltage interface and a first ground wire interface, the high-voltage interface and the first ground wire interface are arranged on the inner wall of the shell, and the high-voltage interface and the first ground wire interface are arranged at intervals;
the short circuit assembly comprises a short circuit sheet and a linkage rod, wherein the short circuit sheet is of a strip-shaped sheet structure made of a conductor material; one end of the short tab is in sliding connection with the linkage rod, and the other end of the short tab is hinged with the inner wall of the shell;
the high-voltage interface and the first ground wire interface are arranged on the same side of the short-circuit sheet, and the short-circuit sheet is used for connecting the high-voltage interface with the first ground wire interface after rotating to a certain angle.
2. The high voltage bleed off protection device of claim 1, wherein the cable interface further comprises a second ground wire interface disposed on an inner wall of the housing, the second ground wire interface being disposed in spaced relation to the high voltage interface, the second ground wire interface being disposed in alignment with the high voltage interface and the first ground wire interface.
3. The high voltage bleed-off protection device of claim 2, wherein a metal clip is provided on each of the high voltage interface, the first ground wire interface, and the second ground wire interface on a side opposite the shorting tab, the metal clip being configured to clamp the shorting tab.
4. The high-voltage release protection device according to claim 3, wherein the housing comprises an interface housing, the interface housing is respectively covered on the high-voltage interface, the first ground wire interface and the second ground wire interface, through holes are formed in the interface housing, and the metal clamping pieces are connected with submarine cable lines through the through holes.
5. The high voltage bleed-off protection device of claim 2, wherein an insulating protrusion is provided between the high voltage interface and the first ground wire interface, and an insulating protrusion is provided between the high voltage interface and the second ground wire interface.
6. The high voltage bleed protection device of claim 1, wherein the shorting assembly further comprises a proximal ground wire, the proximal ground wire being connected to the shorting tab.
7. The high-pressure release protection device according to claim 1, wherein a chute is arranged at one end of the short connecting piece, which is in sliding connection with the linkage rod, and a sliding block is arranged at one side of the linkage rod, which is in sliding connection with the short connecting piece; the sliding block is clamped in the sliding groove.
8. The high pressure bleed protection device of claim 1, further comprising an operating handle having one end connected to the linkage rod and the other end extending outside the housing.
9. The high voltage bleeder protection device as defined in claim 8, wherein an end of the linkage rod slidably connected to the shorting tab is covered with an insulator; the linkage rod is hinged with the shell, and the hinged position of the linkage rod and the shell is located between the insulating piece and the operating handle.
10. The high-voltage release protection device of claim 9, wherein the housing is further provided with a first limit switch and a second limit switch, and the first limit switch and the second limit switch are arranged on one side of the linkage rod; the first limit switch is opposite to the second limit switch and is obliquely arranged, the first limit switch is used for detecting normal state position information of the linkage rod and limiting the rotation range of the linkage rod together with the second limit switch, and the second limit switch is used for detecting working state position information of the linkage rod and limiting the rotation range of the linkage rod together with the first limit switch.
11. A submarine cable power supply system, which comprises a remote power supply system, a marine grounding device and a site grounding device, and is characterized by further comprising the high-voltage discharge protection device according to any one of claims 1-10, wherein a high-voltage output end in the remote power supply system is connected with the high-voltage interface, a marine ground wire in the marine grounding device is connected with the first ground wire interface, and the high-voltage discharge protection device is used for shorting the high-voltage output end and the ground wire to protect the remote power supply system when the remote power supply system is in a power-down state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310735377.0A CN116505338B (en) | 2023-06-21 | 2023-06-21 | High-voltage release protection device and submarine cable power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310735377.0A CN116505338B (en) | 2023-06-21 | 2023-06-21 | High-voltage release protection device and submarine cable power supply system |
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| CN116505338B true CN116505338B (en) | 2023-09-08 |
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| CN213546802U (en) * | 2020-10-30 | 2021-06-25 | 四川格斯拉科技有限公司 | 120kV oil type grounding discharge module |
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| FR2831342B1 (en) * | 2001-10-22 | 2003-12-19 | Alstom | PROTECTION SYSTEM FOR A THREE-PHASE DISTRIBUTION TRANSFORMER INSULATED IN A LIQUID DIELECTRIC COMPRISING A PHASE DISCOVER SWITCH |
| EP3152803B1 (en) * | 2014-06-04 | 2018-06-27 | Siemens Aktiengesellschaft | Connector part of a connector unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110075514A (en) * | 2009-12-28 | 2011-07-06 | 주식회사 효성 | Switch operating apparatus for gas insulated switchgear |
| CN103516231A (en) * | 2013-10-22 | 2014-01-15 | 无锡希恩电气有限公司 | Box-type high-voltage DC power supply |
| CN204407864U (en) * | 2014-12-29 | 2015-06-17 | 浙江日新电气有限公司 | Transformer neutral point comprehensive protector |
| CN212571615U (en) * | 2020-05-21 | 2021-02-19 | 国网浙江省电力有限公司嘉兴供电公司 | Short-circuit device for uninterrupted electricity conversion meter |
| CN213546802U (en) * | 2020-10-30 | 2021-06-25 | 四川格斯拉科技有限公司 | 120kV oil type grounding discharge module |
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| CN116505338A (en) | 2023-07-28 |
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