A load access device and a power line penetration method for load access

Abstract

An embodiment of the present application provides a load access device and a construction method, wherein the load access device includes: a first load switch connected to the incoming line of the load; a second load switch connected to the outgoing line of the load; a third load switch located on the connecting line, wherein the connecting line connects the incoming line of the load and the outgoing line of the load; the third load switch forms a mechanical lock with at least one of the first load switch and the second load switch; in the first switching state of the mechanical lock, the third load switch is closed, and the first load switch and the second load switch are disconnected; in the second switching state of the mechanical lock, the third load switch is disconnected, and the first load switch and the second load switch are closed.

Description

Technical Field

[0001] The present invention relates to the field of railway power, and in particular to a load access device and a power line penetration method for load access. Background Art

[0002] With the rapid development of the railway network, the problem of shared channels between different railway lines has become increasingly prominent. Different lines often have different construction periods, and the power equipment of the parallel sections cannot be implemented synchronously. Therefore, the reservation of power facilities on the parallel sections of the lines implemented in advance, and the guarantee of the existing line construction when the power equipment is connected to the later implemented lines are increasingly concerned and valued by the operating units and construction units. Among them, the problem of connecting loads to power through-lines is the most prominent.

[0003] The conventional construction method for connecting loads to power through-lines is to first lay the power through-lines; when the line construction is implemented later, the power through-lines are disconnected using the skylight points, the power through-line inlet port of the cable docking box is connected to the through-line inlet cable, and the power through-line outlet port of the cable docking box is connected to the through-line outlet cable; additional cables are added to connect the load inlet terminal of the cable docking box and the power inlet terminal of the load; as well as the power outlet terminal of the load and the load outlet terminal of the cable docking box.

[0004] Conventional cable docking boxes inevitably require power outages for construction at skylight points, and multiple skylight points are required in places with complex construction conditions, which makes construction difficult and costly. In addition, there are two cable docking boxes after the construction is completed, which increases the number of fault points in the power through-line, greatly affecting the power supply reliability of the railway power through-line and easily causing safety hazards. Summary of the invention

[0005] The embodiment of the present invention provides a load access device and a power line penetration method for load access.

[0006] The technical solution of the embodiment of the present invention is implemented as follows:

[0007] An embodiment of the present invention provides a load access device, the load access device comprising:

[0008] The first load switch is connected to the incoming line of the load;

[0009] A second load switch connected to the output line of the load;

[0010] A third load switch is located on a connecting line, wherein the connecting line connects an incoming line of the load and an outgoing line of the load;

[0011] The third load switch forms a mechanical lock with at least one of the first load switch and the second load switch;

[0012] In the first switch state of the mechanical lock, the third load switch is closed, and the first load switch and the second load switch are disconnected;

[0013] In the second switching state of the mechanical lock, the third load switch is open, and the first load switch and the second load switch are closed.

[0014] The load access device further includes: a first isolating switch and a second isolating switch;

[0015] The first isolating switch is connected to the incoming line of the load and is located at the front end of the first load switch;

[0016] The second isolating switch is connected to the outgoing line of the load and is located at the rear end of the second load switch.

[0017] In the above solution, the load access device further includes: a first metal oxide lightning arrester, a second metal oxide lightning arrester, a third metal oxide lightning arrester and / or a fourth metal oxide lightning arrester;

[0018] The first metal oxide arrester is connected between the first load switch and the grounding point;

[0019] The second metal oxide arrester is connected between the second load switch and the grounding point;

[0020] The third metal oxide arrester is connected between the second isolating switch and the grounding point;

[0021] The fourth metal oxide arrester is connected between the first isolating switch and the grounding point.

[0022] In the above solution, the load access device further includes: a first charge display device, a second charge display device, a third charge display device and a fourth charge display device;

[0023] The first charged display device is connected between the first load switch and the grounding point;

[0024] The second live display device is connected between the second load switch and the grounding point;

[0025] The third charge display device is connected between the second isolating switch and the grounding point;

[0026] The fourth charge display device is connected between the first isolating switch and the grounding point.

[0027] In the above solution, the load access device further includes:

[0028] The input and output lines of the load are connected to different ports of the same power through line.

[0029] In the above solution, the load access device further includes: a cable docking box; the cable docking box includes: a first port, a second port, a third port and a fourth port;

[0030] The first port is the incoming port of the power through-line;

[0031] The fourth port is an outlet port of the power through-line;

[0032] The load is connected between the second port and the third port;

[0033] An incoming line of the load is connected between the first port and the second port;

[0034] An outgoing line of the load is connected between the third port and the fourth port.

[0035] An embodiment of the present invention further provides a power line penetration method for load access, the method comprising:

[0036] Install a cable docking box on the power through-line;

[0037] Connect the incoming and outgoing lines of the load to different ports in the cable docking box respectively;

[0038] A first load switch is arranged on the incoming line;

[0039] A second load switch is arranged on the outgoing line;

[0040] A third load switch is arranged on the connecting line, wherein the connecting line connects the incoming line and the outgoing line; the third load switch forms a mechanical lock with at least one of the first load switch and the second load switch;

[0041] When the load is not connected, the mechanical lock is controlled to be in a first switch state; wherein, in the first switch state, the third load switch is closed, and the first load switch and the second load switch are opened;

[0042] When the load is hung, the mechanical lock is controlled to be in a second switching state, wherein in the second switching state, the third load switch is opened, and the first load switch and the second load switch are closed.

[0043] In the above scheme, the method comprises:

[0044] A first isolating switch is arranged on the incoming line;

[0045] A second isolating switch is arranged on the outgoing line;

[0046] In the second switch state, the second isolating switch, the second load switch, the first isolating switch and the first load switch are closed in sequence.

[0047] In the above scheme, the method further includes at least one of the following:

[0048] Disposing a first metal oxide arrester between the first load switch and the grounding point;

[0049] Disposing a second metal oxide arrester between the second load switch and the grounding point;

[0050] A third metal oxide arrester is arranged between the second isolating switch and the grounding point;

[0051] A fourth metal oxide arrester is arranged between the first isolating switch and the grounding point.

[0052] In the above scheme, the method further includes at least one of the following:

[0053] A first power-on display device is provided between the first load switch and the grounding point;

[0054] A second power-on display device is provided between the second load switch and the grounding point;

[0055] A third live display device is provided between the second isolating switch and the grounding point;

[0056] A fourth charge display device is arranged between the first isolating switch and the grounding point.

[0057] In the above scheme, the method further includes:

[0058] The incoming line and the outgoing line of the load are connected to different ends of the same power through-line.

[0059] In the above scheme, the method further includes:

[0060] Install a cable docking box; wherein the cable docking box includes: a first port, a second port, a third port and a fourth port;

[0061] The first port is the incoming port of the power through-line;

[0062] The fourth port is an outlet port of the power through-line;

[0063] The load is connected between the second port and the third port;

[0064] An incoming line of the load is connected between the first port and the second port;

[0065] An outgoing line of the load is connected between the third port and the fourth port.

[0066] In an embodiment of the present invention, the flow direction of the through-line circuit is switched by mechanical interlocking formed by the third load switch in the load access device and at least one of the first load switch and the second load switch, thereby ensuring that the circuit through-line remains connected during the connection process, and there is no need to disconnect the circuit through-line for construction, thereby minimizing the labor and time costs of skylight point construction. After the load is connected, the load path can be completed by adjusting the mechanical interlocking state, and the reversal process is simple and easy to operate. When the load is maintained and replaced at a later stage, the present invention can also be used to inspect and replace the mounted load without powering off the through-line, which is easy to operate and reduces the labor and time costs of maintenance. The present invention can connect new loads to the power through-line by presetting a load access device on the power through-line, reducing the number of docking boxes, thereby reducing the fault points of the power through-line and improving the power supply reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0068] Figure 1 It is a partial circuit diagram of the load access device provided by the present invention;

[0069] Figure 2 The overall circuit diagram of the load access device provided by the present invention is

[0070] Figure 3 A block diagram of a load access device provided by the present invention;

[0071] Figure 4 A flow chart of a power line penetration method for load access provided by the present invention;

[0072] Figure 5 is another flow chart of the power line penetration method for load access provided by the present invention; DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0074] In the absence of conflicts, the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily. Although a logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order than here.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0076] Figure 1 This is a partial circuit diagram of the load access device provided by the present invention. Figure 1 The load access device includes a first load switch 111, a second load switch 112, and a third load switch 113. The first load switch 111 is connected to the incoming line 101 of the load; the second load switch 112 is connected to the outgoing line 102 of the load; the third load switch 113 is located on the connecting line, wherein the connecting line 103 connects the incoming line of the load and the outgoing line of the load.

[0077] Further, the third load switch forms a mechanical lock with at least one of the first load switch and the second load switch;

[0078] Wherein, in the first switching state of the mechanical lock, the third load switch is closed, and the first load switch and the second load switch are opened; in the second switching state of the mechanical lock, the third load switch is opened, and the first load switch and the second load switch are closed.

[0079] Specifically, the load switch is a switching device between a circuit breaker and an isolating switch, has a simple arc extinguishing device, can cut off the rated load current and a certain overload current, but cannot cut off the short-circuit current.

[0080] The load switch can be divided into high-voltage load switch and low-voltage load switch according to the operating voltage. Among them, the high-voltage load switch mainly includes solid gas-generating high-voltage load switch, compressed gas high-voltage load switch, compressed air high-voltage load switch, SF6 high-voltage load switch, oil-immersed high-voltage load switch, vacuum high-voltage load switch, etc. It depends on the application scenario and is not specifically limited.

[0081] In some embodiments, Figure 1 As shown, the third load switch forms a mechanical lock with the first load switch; in other embodiments, the third load switch may also form a mechanical lock with the first load switch;

[0082] In the present invention, by setting the third load switch, the mechanical lock formed with at least one of the first load switch and the second load switch can achieve the effect of determining whether the power through-line flows directly through the third load switch or flows out after passing through the load, thereby realizing the switching of the power through-line circuit flow direction.

[0083] It should be noted that mechanical interlocking is to use a mechanical mechanism that restrains and links each other between the operating parts of the switch cabinet or outdoor knife to achieve the interlocking requirements of sequential actions. Mechanical interlocking does not require the use of auxiliary operations such as keys during operation, and can be automatically unlocked step by step as the operation sequence is carried out correctly. In the event of an erroneous operation, automatic interlocking can be achieved to prevent the erroneous operation from occurring. Mechanical interlocking can achieve forward and reverse interlocking requirements, and has the advantages of intuitive interlocking, not easy to damage, small maintenance workload, and easy operation. This depends on the application scenario and is not specifically limited.

[0084] In the present invention, the mechanical locking is used to achieve the reverse locking requirement, such as Figure 1 As shown, the mechanical interlock is composed of the third load switch and the first load switch. When the third load switch is closed, the first load switch is automatically disconnected by the linkage mechanical mechanism. At this time, the mechanical interlock is in the first switch state; conversely, when the third load switch is disconnected, the first load switch is automatically closed by the linkage mechanical mechanism. At this time, the mechanical interlock is in the second switch state.

[0085] Specifically, when the mechanical lock is in the first switch state, the third load switch is closed, so that the connection line 103 is connected, and the passage of the circuit through-line is guaranteed during the load hanging process, and the construction of connecting the load can be carried out without disconnecting the circuit through-line, thereby minimizing the labor and time costs of the skylight point construction. At the same time, the first load switch and the second load switch are disconnected, so that the incoming line 101 and the outgoing line 102 of the load are in a disconnected state, and the energized circuit through-line is isolated from the load connection port of the cable docking box, ensuring that the load connection port of the cable docking box is in a non-powered state during the load hanging process, so that the construction personnel can directly hang the load, and the hanging process is simple and easy to operate.

[0086] Furthermore, after the load is connected, the mechanical locking state is adjusted to the second switch state. The third load switch is disconnected, the first load switch and the second load switch are closed, and the circuit through-line current is output after passing through the load, thereby adding a new load path.

[0087] Furthermore, by freely adjusting the mechanical locking state, the load can be inspected and replaced when the load is maintained or replaced at a later time without power outage of the circuit through-line, which is convenient to operate and reduces the labor and time costs of maintenance.

[0088] In some embodiments, reference Figure 2 As shown, the load access device also includes: a first isolating switch 121 and a second isolating switch 122; the first isolating switch 121 is connected to the incoming line of the load and is located at the front end of the first load switch 111; the second isolating switch 122 is connected to the outgoing line of the load and is located at the front end of the second load switch 112.

[0089] Specifically, an isolating switch is a switching device that is mainly used to isolate power, switch off, and connect and disconnect low-current circuits. It does not have an arc extinguishing function and can only open and close circuits without load current. When the isolating switch is in the open position, there is an insulation distance that meets the specified requirements and an obvious disconnection mark between the contacts; when in the closed position, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time.

[0090] The isolating switches can be divided into outdoor isolating switches and indoor high-voltage isolating switches according to different installation methods; they can be divided into single-column isolating switches, double-column isolating switches and three-column isolating switches according to different insulating pillar structures; they can be divided into low-voltage isolating switches and high-voltage isolating switches according to different voltage levels. It depends on the application scenario and is not specifically limited.

[0091] It should be noted here that since the load switch can only cut off the rated load current and a certain overload current, but cannot cut off the short-circuit current, the first isolating switch 121 and the second isolating switch 122 are respectively arranged at the front end of the first load switch 111 and the front end of the second load switch 112 to form an obvious disconnection mark in the incoming and outgoing lines, so as to ensure that an obvious break is formed during the process of connecting the load, line maintenance or equipment maintenance to isolate the live parts, and the construction port is in a power-free state to ensure that no current passes through the load, thereby ensuring the safety of construction personnel and equipment.

[0092] Furthermore, the load access device further includes: a metal oxide surge arrester (MOA). A first metal oxide surge arrester (MOA1), a second metal oxide surge arrester (MOA2), a third metal oxide surge arrester (MOA3) and / or a fourth metal oxide surge arrester (MOA4);

[0093] The first metal oxide arrester (MOA1) is connected between the first load switch 111 and the grounding point (GND); the second metal oxide arrester (MOA2) is connected between the second load switch 112 and the grounding point; the third metal oxide arrester (MOA3) is connected between the second isolating switch 122 and the grounding point; the fourth metal oxide arrester (MOA4) is connected between the first isolating switch 121 and the grounding point.

[0094] Specifically, the metal oxide arrester is an important protective device for protecting the insulation of power transmission and transformation equipment from overvoltage hazards.

[0095] Furthermore, the load access device also includes: a first charge display device (DX1), a second charge display device (DX2), a third charge display device (DX3) and / or a fourth charge display device (DX4); the first charge display device (DX1) is connected between the first load switch 111 and the grounding point; the second charge display device (DX2) is connected between the second load switch 112 and the grounding point; the third charge display device (DX3) is connected between the second isolating switch 121 and the grounding point; the fourth charge display device (DX4) is connected between the first isolating switch 122 and the grounding point.

[0096] Specifically, the charged display device is used to indicate whether current passes through the incoming line segment or the outgoing line segment where the charged display device is located.

[0097] The disclosed embodiment ensures that the ports where the incoming line 101 of the load and the outgoing line 102 of the load are connected to the newly added load to be connected are in a de-energized state through the first isolating switch 121, the second isolating switch 122, the third power-on display device (DX3) and the fourth power-on display device (DX4), and isolates the energized power through-line from the ports where the incoming line 101 of the load and the outgoing line 102 of the load are connected to the newly added load, thereby ensuring the normal operation of the through-line during construction, and the de-energization of the load ports ensures safety during the construction process.

[0098] Figure 3 A block diagram of a load access device provided by the present invention; Figure 3As shown, the load access device further includes: an incoming line 101 and an outgoing line 102 of the load, which are connected to different ends of the same power through-line.

[0099] Furthermore, the load access device further comprises: a cable docking box 100; the cable docking box 100 comprises: a first port, a second port, a third port and a fourth port;

[0100] The first port 131 is an inlet port of the power through line;

[0101] The fourth port 132 is an outlet port of the power through line;

[0102] The load is connected between the second port 133 and the third port 134;

[0103] An incoming line of the load is connected between the first port 131 and the second port 133;

[0104] An outgoing line of the load is connected between the third port 134 and the fourth port 132 .

[0105] Specifically, in some embodiments, the first port 131 and the fourth port 132 are connected to different ports of the same through line, and the second port 133 and the third port 134 are connected to the power input port 201 and the power output port 202 of the load 200 .

[0106] One end of the incoming line 101 is connected to the first port 131, and the other end of the incoming line 101 is connected to the second port 133; the second port 133 is connected to the power inlet port 201 of the load through a cable. One end of the outgoing line 102 is connected to the third port 134, and the other end of the outgoing line 102 is connected to the fourth port 132; the third port 134 is connected to the power outgoing port 202 of the load through a cable.

[0107] In some embodiments, the first port 131 and the second port 133 of the cable docking box are indoor cold shrink terminals for incoming cables; the third port 134 and the fourth port 132 of the cable docking box are indoor cold shrink terminals for outgoing cables.

[0108] In some embodiments, the cable docking box is pre-laid in the circuit through-line, and different ports of the same power through-line are connected through the first port 131 and the fourth port 132 of the cable docking box. When the mechanical lock is in the first switch state, the first load switch 111, the second load switch 112, the first isolating switch 121 and the second isolating switch 122 are all disconnected; at this time, the second port 133 and the third port 134 connecting the power input and output ports of the load have no current passing through. The circuit through-line current passes through the third load switch 113 and flows from the first port 131 of the cable docking box to the fourth port 132.

[0109] Here, the current passes through the cable docking box to maintain the passage of the power through-line, isolating the energized power through-line from the unenergized second port 133 and the third port 134, while the power through-line operates normally, it also improves the safety of construction workers during the power line through-line process of load access.

[0110] Since the disconnector has no arc extinguishing device and has low breaking capacity, the switching operation sequence must be followed when operating the disconnector. When the mechanical lock is in the second switch state, the second disconnector 122, the second load switch 112, the first disconnector 121 and the first load switch 111 need to be closed in sequence; at this time, the third load switch 113 is disconnected; the circuit through-line current passes through the first load switch 111, flows from the first port 131 of the cable docking box to the second port 133, and then flows from the connected load power inlet port 201 to the connected load, and flows from the load power outlet port 202 through the third port 134 and out from the fourth port 132, thus realizing the passage of the load in the entire access circuit through-line.

[0111] Figure 4 A flow chart of a power line penetration method for load access provided by the present invention; Figure 4 As shown, the power line penetration method for load access includes:

[0112] Step S401: installing a cable docking box on the power through-line;

[0113] Specifically, a position for a cable connection box is reserved on the line paralleling segment implemented in advance, and a cable connection box is set at the reserved position of the power through-line.

[0114] Step S402: connecting the incoming and outgoing lines of the load to different ports in the cable docking box respectively;

[0115] Step S403: Setting a first load switch on the incoming line;

[0116] Step S404: Setting a second load switch on the outgoing line;

[0117] Step S405: a third load switch is arranged on the connection line, wherein the connection line connects the incoming line and the outgoing line; the third load switch forms a mechanical lock with at least one of the first load switch and the second load switch;

[0118] Specifically, when the load is not connected, the mechanical lock is controlled to be in a first switch state; wherein, in the first switch state, the third load switch is closed, and the first load switch and the second load switch are opened;

[0119] When the load is hung, the mechanical lock is controlled to be in a second switching state, wherein in the second switching state, the third load switch is opened, and the first load switch and the second load switch are closed.

[0120] Specifically, the load may be a box transformer load or a traction substation booth load, which is not specifically limited here.

[0121] In some embodiments, the third load switch forms a mechanical lock with the first load switch; in other embodiments, the third load switch may also form a mechanical lock with the first load switch;

[0122] In the present invention, by setting the third load switch, the mechanical lock formed with at least one of the first load switch and the second load switch can achieve the effect of determining whether the power through-line flows directly through the third load switch or flows out after passing through the load, thereby realizing the switching of the power through-line circuit flow direction.

[0123] In the present invention, the mechanical interlock is used to realize the reverse interlock requirement. In this embodiment, the mechanical interlock is composed of the third load switch and the first load switch. When the third load switch is closed, the first load switch is automatically disconnected by the linkage mechanical mechanism. At this time, the mechanical interlock is in the first switch state; conversely, when the third load switch is disconnected, the first load switch is automatically closed by the linkage mechanical mechanism. At this time, the mechanical interlock is in the second switch state.

[0124] Furthermore, the method further comprises: arranging a first isolating switch on the incoming line; arranging a second isolating switch on the outgoing line. Since the isolating switch has no arc extinguishing device and has a low breaking capacity, the switching operation sequence must be followed when operating the isolating switch. In the second switch state, the second isolating switch, the second load switch, the first isolating switch and the first load switch are closed in sequence.

[0125] Specifically, since the load switch can only cut off the rated load current and a certain overload current, but cannot cut off the short-circuit current, the first isolating switch 121 and the second isolating switch 122 are respectively arranged at the front end of the first load switch 111 and the front end of the second load switch 112 to form an obvious disconnection mark in the incoming and outgoing lines, so as to ensure that an obvious break is formed during the process of connecting the load, line maintenance or equipment maintenance to isolate the live parts, and the construction port is in a power-free state to ensure that no current passes through the load, thereby ensuring the safety of construction personnel and equipment.

[0126] Furthermore, the method also includes at least one of the following: setting a first metal oxide arrester between the first load switch and the grounding point; setting a second metal oxide arrester between the second load switch and the grounding point; setting a third metal oxide arrester between the second isolating switch and the grounding point; setting a fourth metal oxide arrester between the first isolating switch and the grounding point.

[0127] Specifically, the metal oxide arrester is an important protective device for protecting the insulation of power transmission and transformation equipment from overvoltage hazards.

[0128] Furthermore, the method also includes at least one of the following: setting a first charge display device between the first load switch and the grounding point; setting a second charge display device between the second load switch and the grounding point; setting a third charge display device between the first isolating switch and the grounding point; setting a fourth charge display device between the second isolating switch and the grounding point.

[0129] Specifically, the charged display device is used to indicate whether current passes through the incoming line segment or the outgoing line segment where the charged display device is located.

[0130] The disclosed embodiment ensures that the ports where the incoming line of the load and the outgoing line of the load are connected to the newly added load to be connected are in a de-energized state through the first isolating switch, the second isolating switch, the third power-on display device, and the fourth power-on display device, and isolates the energized power through-line from the incoming line of the load and the outgoing line of the load from the port where the newly added load is connected, thereby ensuring the normal operation of the through-line during construction, and the de-energization of the load ports ensures safety during the construction process.

[0131] Furthermore, step 402 also includes: connecting the incoming line and the outgoing line of the load to different ports of the same power through-line.

[0132] Further, the method further comprises: installing a cable docking box;

[0133] Wherein, the cable docking box includes: a first port, a second port, a third port and a fourth port; the first port is the input port of the power through-line; the fourth port is the output port of the power through-line; the load is connected between the second port and the third port; the input line of the load is connected between the first port and the second port; the output line of the load is connected between the third port and the fourth port.

[0134] Specifically, in some embodiments, the first port and the fourth port are connected to different ports of the same through line, and the second port and the third port are connected to a power input port and a power output port of a load.

[0135] One end of the incoming line is connected to the first port, and the other end of the incoming line is connected to the second port; the second port is connected to the power inlet port of the load through a cable. One end of the outgoing line is connected to the third port, and the other end of the outgoing line is connected to the fourth port; the third port is connected to the power outlet port of the load through a cable.

[0136] The mechanical interlock formed by the third load switch in the load access device and at least one of the first load switch and the second load switch is used to switch the flow direction of the through-line circuit, thereby ensuring that the circuit through-line remains connected during the connection process, without the need to disconnect the circuit through-line for construction, thereby minimizing the labor and time costs of skylight point construction. After the load is connected, the load path can be completed by adjusting the mechanical interlock state. The reversal process is simple and easy to operate. When the load is maintained and replaced at a later stage, the present invention can also be used to inspect and replace the mounted load without powering off the through-line. The operation is convenient and reduces the labor and time costs of maintenance. The present invention pre-sets a load access device on the power through-line to connect the newly added load to the power through-line, thereby reducing the number of docking boxes, thereby reducing the failure points of the power through-line and improving the power supply reliability.

[0137] The following is a specific example to illustrate the power line penetration method for load access of the present invention:

[0138] Step 1: When laying the power through-line, reserve a cable docking box for later implementation of the line.

[0139] Step 2: Set up a cable docking box at the reserved position of the power through-line;

[0140] Step 3: Connect the first port of the cable docking box and the incoming line port of the power through-line, and connect the fourth port of the cable docking box and the outgoing line port of the power through-line.

[0141] Step 4: Ensure that the third load switch is closed, and the first load switch and the second load switch are disconnected; at the same time, the first isolating switch and the second isolating switch are disconnected, and confirm that the power display devices DX1 and DX2 are in a power-free state.

[0142] Step 5: Install additional cables, connect the second port of the cable docking box and the power input port of the box-type transformer. Install additional cables, connect the third port of the cable docking box and the power output port of the box-type transformer.

[0143] Step 6: Close the second isolating switch, close the second load switch, close the first isolating switch, close the first load switch, and open the third load switch in sequence to complete the box-type transformer load connection.

[0144] Figure 5 is another flow chart of the power line penetration method for load access provided by the present invention;

[0145] Step 501: When laying the power through-line, reserve a cable docking box for later implementation of the line.

[0146] Step 502: Install a cable docking box at the location reserved for the power through-line.

[0147] Step 503: Connect the first port of the cable docking box and the incoming port of the power through-line, and connect the fourth port of the cable docking box and the outgoing port of the power through-line.

[0148] Step 504: Ensure that the third load switch is closed, and the first load switch and the second load switch are opened; at the same time, the first isolating switch and the second isolating switch are opened, and confirm that the power display devices DX1 and DX2 are in a power-free state.

[0149] Step 505: Add a cable to connect the second port of the cable docking box and the power input port of the traction substation booth load; add a cable to connect the third port of the cable docking box and the power output port of the traction substation booth load.

[0150] Step 506: Close the second isolating switch, close the second load switch, close the first isolating switch, close the first load switch, and open the third load switch in sequence to complete the connection of the traction substation booth load.

[0151] The features disclosed in several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0152] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A load access device, characterized in that: include: The first load switch is connected to the incoming line of the load; A second load switch connected to the output line of the load; A third load switch is located on a connecting line, wherein the connecting line connects an incoming line of the load and an outgoing line of the load; The third load switch forms a mechanical lock with at least one of the first load switch and the second load switch; In the first switch state of the mechanical lock, the third load switch is closed, and the first load switch and the second load switch are disconnected; In the second switch state of the mechanical lock, the third load switch is opened, and the first load switch and the second load switch are closed; Wherein, the load access device further comprises: a cable docking box; the cable docking box comprises: a first port, a second port, a third port and a fourth port; The first port is an incoming port of the power through line; The fourth port is an outlet port of the power through-line; The load is connected between the second port and the third port; An incoming line of the load is connected between the first port and the second port; An outgoing line of the load is connected between the third port and the fourth port.

2. The load access device according to claim 1, characterized in that: The load access device further includes: a first isolating switch and a second isolating switch; The first isolating switch is connected to the incoming line of the load and is located at the front end of the first load switch; The second isolating switch is connected to the outgoing line of the load and is located at the front end of the second load switch.

3. The load access device according to claim 2, characterized in that: The load access device further includes: a first metal oxide arrester, a second metal oxide arrester, a third metal oxide arrester and / or a fourth metal oxide arrester; The first metal oxide arrester is connected between the first load switch and the grounding point; The second metal oxide arrester is connected between the second load switch and the grounding point; The third metal oxide arrester is connected between the second isolating switch and the grounding point; The fourth metal oxide arrester is connected between the first isolating switch and the grounding point.

4. The load access device according to claim 2, characterized in that: The load access device further includes: a first charge display device, a second charge display device, a third charge display device and a fourth charge display device; The first charged display device is connected between the first load switch and the grounding point; The second live display device is connected between the second load switch and the grounding point; The third charge display device is connected between the second isolating switch and the grounding point; The fourth charge display device is connected between the first isolating switch and the grounding point.

5. The load access device according to claim 1, characterized in that: The load access device also includes: The input line and the output line of the load are connected to different ends of the same power through line.

6. A method for connecting a power line for load access, characterized in that: The method comprises: Install a cable docking box on the power through-line; Connect the incoming and outgoing lines of the load to different ports in the cable docking box respectively; A first load switch is arranged on the incoming line; A second load switch is arranged on the outgoing line; A third load switch is arranged on the connecting line, wherein the connecting line connects the incoming line and the outgoing line; the third load switch forms a mechanical lock with at least one of the first load switch and the second load switch; When the load is not connected, the mechanical lock is controlled to be in a first switch state; wherein, in the first switch state, the third load switch is closed, and the first load switch and the second load switch are opened; When the load is hung, controlling the mechanical lock to be in a second switch state, wherein in the second switch state, the third load switch is opened, and the first load switch and the second load switch are closed; Wherein, the method further comprises: Install a cable docking box; wherein the cable docking box includes: a first port, a second port, a third port and a fourth port; The first port is an incoming port of the power through line; The fourth port is an outlet port of the power through-line; The load is connected between the second port and the third port; An incoming line of the load is connected between the first port and the second port; An outgoing line of the load is connected between the third port and the fourth port.

7. The method for connecting a power line for load access according to claim 6, characterized in that: The method comprises: A first isolating switch is arranged on the incoming line; A second isolating switch is arranged on the outgoing line; In the second switch state, the second isolating switch, the second load switch, the first isolating switch and the first load switch are closed in sequence.

8. The method for connecting a power line for load access according to claim 7, characterized in that: The method further comprises at least one of the following: Disposing a first metal oxide arrester between the first load switch and the grounding point; Disposing a second metal oxide arrester between the second load switch and the grounding point; A third metal oxide arrester is arranged between the second isolating switch and the grounding point; A fourth metal oxide arrester is arranged between the first isolating switch and the grounding point.

9. The method for connecting a power line for load access according to claim 7, characterized in that: The method further comprises at least one of the following: A first power-on display device is provided between the first load switch and the grounding point; A second power-on display device is provided between the second load switch and the grounding point; A third live display device is provided between the first isolating switch and the grounding point; A fourth charge display device is arranged between the second isolating switch and the grounding point.

10. The method for connecting a power line for load access according to claim 6, characterized in that: The method further comprises: The incoming line and the outgoing line of the load are connected to different ends of the same power through-line.

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