A method for removing faults in dual power supply lines

Abstract

The present invention discloses a method for removing faults in a dual-power supply line, including connecting each ring network cabinet through a cable junction box to form a passage; the communication between the switch under test, the adjacent switch on the left, and the adjacent switch on the right is normal; and they are respectively in the closed position; the states of the switch under test, the adjacent switch on the left, and the adjacent switch on the right are detected to determine whether a short circuit occurs between the lines; when a fault occurs in the dual-power supply line, the switch under test detects that the phase current is greater than a set value or the zero-sequence current is greater than a set value, and after the intelligent distributed fault tripping time, one and only one of the adjacent switches on the left and right sides of the switch under test is in the first state; and the switch under test is determined to be a fault removal switch. The present invention can easily determine the specific position of the fault point on the line when a fault occurs at a certain point in the line under the dual-power supply mode, thereby improving the correctness of removing the fault point on the line.

Description

Technical Field

[0001] The invention relates to the technical field of line faults, in particular to a method for removing a dual-power supply line fault. Background Art

[0002] After a power line fault occurs, the relay protection device closest to the fault point on the power point side is usually used to cut off the fault. This method determines the action behavior of the single-side switch protection device and is applicable to power supply-load, that is, single power supply conditions. This method is not applicable to power supply-load-power supply dual power supply conditions and cannot correctly cut off the fault; when a fault occurs at a certain point in the line under dual power supply mode, it is urgent to have its fault location correctly cut off. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above problems and / or the problems existing in the existing dual power supply line fault removal method, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is to provide a line fault removal method based on the operating conditions of adjacent switch protection devices.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for removing a dual power supply line fault, comprising:

[0007] Connect each ring main unit through the cable junction box to form a passage;

[0008] The communication between the switch under test, the adjacent switch on the left, and the adjacent switch on the right is normal;

[0009] The switch under test, the left adjacent switch and the right adjacent switch are respectively in the closed position;

[0010] The states of the switch under test, the left adjacent switch and the right adjacent switch are detected, the first state is that the relay protection device is not started, and the second state is that the relay protection device is started, to determine whether a short circuit occurs between the lines;

[0011] A dual power supply line fails, the switch under test detects that the phase current is greater than a set value or the zero-sequence current is greater than a set value, and after the intelligent distributed fault tripping time, only one of the adjacent switches on the left and right sides of the switch under test is in the first state; the switch under test is judged to be a fault removal switch;

[0012] The cable junction box comprises an installation unit and a wiring unit, wherein the wiring unit is arranged in the installation unit;

[0013] The installation unit comprises a box body and a cover detachably connected to the box body;

[0014] A rotating rod is disposed on one side of the cover, a supporting rod is disposed on the box body, a through hole is disposed on the supporting rod, and the rotating rod passes through the through hole and rotates around the supporting rod; and,

[0015] The wiring unit is arranged in the box body, and includes a support frame fixedly arranged at the bottom of the box body, a current-carrying conductor fixedly arranged at the bottom of the support frame, an A terminal arranged on one side of the current-carrying conductor, a B terminal arranged on the side of the current-carrying conductor away from the A terminal, a first wire detachably connected to the A terminal, and a second wire detachably connected to the B terminal, so that the current-carrying conductor, the first wire, and the second wire are detachably electrically connected.

[0016] As a preferred solution of the dual power supply line fault removal method described in the present invention, wherein: the switch under test is in the closed position and is in the second state; the left adjacent switch is in the closed position and is in the second state; the right adjacent switch is in the closed position and is in the first state; the switch under test is judged to be a fault removal switch.

[0017] As a preferred solution of the dual power supply line fault removal method described in the present invention, wherein: the switch under test is in the closed position and is in the second state; the adjacent switch on the right is in the closed position and is in the second state; the adjacent switch on the left is in the closed position and is in the first state; the switch under test is judged to be a fault removal switch.

[0018] As a preferred solution of the dual power supply line fault removal method described in the present invention, the A terminal includes a first wiring port arranged on the support frame, a first telescopic member arranged on the top of the first wiring port, and a first conductive member arranged at the bottom of the first wiring port, and the first conductive member is fixedly connected to the current-carrying conductor.

[0019] As a preferred solution of the dual power supply line fault removal method described in the present invention, the B terminal includes a second wiring port arranged on the support frame, a second telescopic member arranged at the top of the second wiring port, and a second conductive member arranged at the bottom of the second wiring port, and the second conductive member is fixedly connected to the power-carrying conductor.

[0020] As a preferred solution of the dual power supply line fault removal method of the present invention, wherein: the support frame is also provided with a connection end, and the connection end is arranged between the first wiring port and the second wiring port.

[0021] As a preferred solution of the dual power supply line fault removal method of the present invention, wherein: a clamping piece is further provided on the support frame, and a groove is further provided on the connecting end, and the clamping piece is engaged and connected with the groove.

[0022] As a preferred solution of the dual power supply line fault removal method described in the present invention, the first telescopic member has a first conductor on its bottom and a first through hole in the middle, and the first electric wire is clamped between the first conductive member and the first conductor.

[0023] As a preferred solution of the dual power supply line fault removal method described in the present invention, the second telescopic member has a second conductor on its bottom and a second through hole in the middle, and the second electric wire is clamped between the second conductive member and the second conductor.

[0024] As a preferred solution of the dual power supply line fault removal method of the present invention, wherein: an elastic protrusion is provided on the clamping member, a limiting groove is provided on the connecting end, and the elastic protrusion cooperates with the limiting groove.

[0025] As a preferred solution of the dual power supply line fault removal method of the present invention, wherein: the clamping member is further provided with an elastic sheet, the connecting end is further provided with a slot, and the elastic sheet cooperates with the slot.

[0026] As a preferred solution of the dual power supply line fault removal method of the present invention, wherein: a protective shell is also provided on the support frame, and the protective shell is detachably connected to the clamping member.

[0027] The beneficial effect of the present invention is that when a fault occurs at a certain point in a line under a dual power supply mode, the present invention can easily determine the specific position of the fault point on the line, thereby improving the accuracy of removing the fault point on the line. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0029] Figure 1A line fault schematic diagram of a dual power supply line fault removal method.

[0030] Figure 2 Schematic diagram of adjacent switches for dual power supply line fault removal method.

[0031] Figure 3 The structural diagram of the cable junction box for the dual power supply line fault removal method.

[0032] Figure 4 The figure is a structural diagram of a wiring unit for a dual power supply line fault removal method.

[0033] Figure 5 The structure diagram of the B terminal of the dual power supply line fault removal method.

[0034] Figure 6 A cross-sectional view of a support frame for a dual power supply line fault removal method. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Example 1

[0039] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , which is the first embodiment of the present invention, and provides a method for removing a dual power supply line fault.

[0040] Connect each ring main unit through the cable junction box M to form a passage to ensure the normal operation of the dual power supply line.

[0041] The communication between the switch under test, the adjacent switch on the left and the adjacent switch on the right is normal; the switch under test, the adjacent switch on the left and the adjacent switch on the right are in the closed position respectively; the states of the switch under test, the adjacent switch on the left and the adjacent switch on the right are detected, the first state is that the relay protection device is not started, and the second state is that the relay protection device is started, and it is judged whether a short circuit occurs between the lines;

[0042] When a dual power supply line fails, the switch under test detects that the phase current is greater than the set value or the zero-sequence current is greater than the set value, and after the intelligent distributed fault tripping time, only one of the adjacent switches on the left and right sides of the switch under test is in the first state; the switch under test is judged to be a fault removal switch;

[0043] The switch under test is in the closed position and in the second state; the adjacent switch on the left is in the closed position and in the second state; the adjacent switch on the right is in the closed position and in the first state; the switch under test is determined to be a fault removal switch.

[0044] The switch under test is in the closed position and in the second state; the adjacent switch on the right is in the closed position and in the second state; the adjacent switch on the left is in the closed position and in the first state; the switch under test is determined to be a fault removal switch.

[0045] Specifically, the cable junction box M includes an installation unit 100 and a wiring unit 200 , and the wiring unit 200 is disposed in the installation unit 100 .

[0046] Furthermore, the installation unit 100 includes a box body 101 and a cover 102 detachably connected to the box body 101; the detachable connection here is an existing connection method, such as plug-in, snap-on, etc.

[0047] Preferably, a rotating rod 102a is provided on one side of the cover 102, a supporting rod 101a is provided on the box body 101, a through hole N is provided on the supporting rod 101a, and the rotating rod 102a passes through the through hole N and rotates around the supporting rod 101a.

[0048] Preferably, the wiring unit 200 is arranged in the box body 101, including a support frame 201 fixedly arranged at the bottom of the box body 101, a power-carrying conductor 202 fixedly arranged at the bottom of the support frame 201, an A terminal 203 arranged on one side of the power-carrying conductor 202, a B terminal 204 arranged on the side of the power-carrying conductor 202 away from the A terminal 203, a first wire 205 detachably connected to the A terminal 203, and a second wire 206 detachably connected to the B terminal 204, so that the power-carrying conductor 202, the first wire 205, and the second wire 206 are detachably electrically connected. The detachable connection here is an existing connection method, such as plugging in, snapping in, etc.

[0049] Specifically, the A terminal 203 includes a first wiring port 203a arranged on the support frame 201, a first telescopic member 203a-1 arranged at the top of the first wiring port 203a, and a first conductive member 203a-2 arranged at the bottom of the first wiring port 203a. The first conductive member 203a-2 and the current-carrying conductor 202 are fixedly connected. The fixed connection here is an existing connection method, such as welding.

[0050] Furthermore, the B terminal 204 includes a second wiring port 204a arranged on the support frame 201, a second telescopic member 204a-1 arranged at the top of the second wiring port 204a, and a second conductive member 204a-2 arranged at the bottom of the second wiring port 204a. The second conductive member 204a-2 and the current-carrying conductor 202 are fixedly connected. The fixed connection here is an existing connection method, such as welding.

[0051] Preferably, the support frame 201 is further provided with a connection end 201 a , and the connection end 201 a is provided between the first wiring port 203 a and the second wiring port 204 a , so that the first wire 205 and the second wire 206 are not in direct contact.

[0052] Preferably, a clamping member 201b is further provided on the support frame 201, and a groove 201a-1 is further provided on the connecting end 201a. The clamping member 201b is snap-fitted and connected with the groove 201a-1. The bottom of the clamping member 201b is inserted into the groove 201a-1 for snap-fit ​​connection.

[0053] Furthermore, the first telescopic member 203a-1 has a first conductor 203a-11 disposed on its bottom, a first through hole 203a-12 disposed in the middle, and the first wire 205 is clamped between the first conductive member 203a-2 and the first conductor 203a-11.

[0054] Preferably, the second telescopic member 204a-1 has a second conductor 204a-11 disposed on the bottom thereof, a second through hole 204a-12 disposed in the middle thereof, and the second wire 206 is clamped between the second conductive member 204a-2 and the second conductor 204a-11.

[0055] Preferably, an elastic protrusion 201b-1 is provided on the clamping member 201b, and a limiting groove 201a-2 is provided on the connecting end 201a. The elastic protrusion 201b-1 cooperates with the limiting groove 201a-2 to ensure that the clamping member 201b is clamped with the connecting end 201a, further ensuring normal connection of the circuit.

[0056] Furthermore, an elastic sheet 201b-2 is provided on the clamping member 201b, and a slot 201a-3 is provided on the connecting end 201a. The elastic sheet 201b-2 cooperates with the slot 201a-3, and the elasticity of the elastic sheet 201b-2 is utilized to reset the device when disassembly is required, so as to further replace the device.

[0057] Preferably, a protective shell 201c is further provided on the support frame 201, and the protective shell 201c is detachably connected to the clamping member 201b. The detachable connection here is an existing connection method, such as plug-in, snap-on, etc.

[0058] When in use, the cable junction box M is used to connect each ring network cabinet to form a path, so that the communication between the switch under test, the adjacent switch on the left and the adjacent switch on the right is normal; by detecting the states of the switch under test, the adjacent switch on the left and the adjacent switch on the right, it is determined whether a short circuit occurs between the lines and the specific location of the line fault point is determined; when a dual power supply line fails, the switch under test detects that the phase current is greater than the set value or the zero-sequence current is greater than the set value, and after the intelligent distributed fault tripping time, one and only one of the adjacent switches on the left and right sides of the switch under test is in the first state; it is determined that the switch under test is a fault removal switch.

[0059] When connecting each ring network cabinet through the cable junction box M, two wires are respectively inserted into the A terminal and the B terminal. The elasticity of the elastic sheet is utilized to press the elastic sheet so that the wires are clamped with the energized conductor to realize the wire passage. When disassembly is required, the elastic sheet is ejected again to loosen the wires from the energized conductor and the wires can be pulled out. The overall connection process is simple and convenient, which is convenient for electrical connection of the ring network cabinet and saves installation time.

[0060] Example 2

[0061] Reference Figure 1 and Figure 2 , which is the second embodiment of the present invention. This embodiment takes the F3 point fault of the 10kV Dangyan line as an example.

[0062] Adjacent switches are switches that have a direct electrical connection. Figure 2 , the adjacent switches of switch 3 are 2 and 4, while switches 1 and 5 are not.

[0063] The switch that needs to be fault-cut off is "Dangcai Line No. 1 Ring Main Unit 000 Switch (Switch 3)", that is, a certain switch in the principle refers to "Dangcai Line No. 1 Ring Main Unit 000 Switch".

[0064] Adjacent switches refer to switches that have a direct electrical connection relationship. The adjacent node switches on the left side of "Switch 000 of Ring Main Unit No. 1 on Dangcai Line" include "Switch 011 of Ring Main Unit No. 1 on Dangcai Line (Switch 2)", "Switch 001 of Ring Main Unit No. 1 on Dangcai Line (Switch 7)", "Switch 002 of Ring Main Unit No. 1 on Dangcai Line (Switch 8)", "Switch 003 of Ring Main Unit No. 1 on Dangcai Line", and "Switch 004 of Ring Main Unit No. 1 on Dangcai Line"; the adjacent node switch on the right side is "Switch 012 of Ring Main Unit No. 1 on Zixue Ⅰ Loop (Switch 4)".

[0065] Specifically, when a fault occurs, "Switch 000 of Ring Main Unit No. 1 for Party and Finance Line" detects overcurrent, and only "Switch 011 of Ring Main Unit No. 1 for Party and Finance Line" on the left side of "Switch 000 of Ring Main Unit No. 1 for Party and Finance Line" detects overcurrent, while none of the adjacent switches on the right side detect overcurrent. Therefore, "Switch 000 of Ring Main Unit No. 1 for Party and Finance Line" is positioned as the fault-clearing switch.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for removing a dual power supply line fault, characterized in that: include, Connect each ring main unit through the cable junction box (M) to form a passage; The communication between the switch under test, the adjacent switch on the left, and the adjacent switch on the right is normal; The switch under test, the left adjacent switch and the right adjacent switch are respectively in the closed position; The states of the switch under test, the left adjacent switch and the right adjacent switch are detected, the first state is that the relay protection device is not started, and the second state is that the relay protection device is started, to determine whether a short circuit occurs between the lines; A dual power supply line fails, the switch under test detects that the phase current is greater than a set value or the zero-sequence current is greater than a set value, and after the intelligent distributed fault tripping time, only one of the adjacent switches on the left and right sides of the switch under test is in the first state; the switch under test is judged to be a fault removal switch; The cable junction box (M) comprises an installation unit (100) and a wiring unit (200), wherein the wiring unit (200) is arranged in the installation unit (100); The installation unit (100) comprises a box body (101) and a cover (102) detachably connected to the box body (101); A rotating rod (102a) is provided on one side of the cover (102), a supporting rod (101a) is provided on the box body (101), a through hole (N) is provided on the supporting rod (101a), and the rotating rod (102a) passes through the through hole (N) and rotates around the supporting rod (101a); and, The wiring unit (200) is arranged in the box body (101), and comprises a support frame (201) fixedly arranged at the bottom of the box body (101), a power conductor (202) fixedly arranged at the bottom of the support frame (201), an A wiring terminal (203) arranged at one side of the power conductor (202), a B wiring terminal (204) arranged at a side of the power conductor (202) away from the A wiring terminal (203), a first wire (205) detachably connected to the A wiring terminal (203), and a second wire (206) detachably connected to the B wiring terminal (204), so that the power conductor (202), the first wire (205), and the second wire (206) are The three are detachably electrically connected, the A terminal (203) comprises a first wiring port (203a) arranged on the support frame (201), the B terminal (204) comprises a second wiring port (204a) arranged on the support frame (201), the support frame (201) is also provided with a connecting end (201a), the connecting end (201a) is arranged between the first wiring port (203a) and the second wiring port (204a), the support frame (201) is also provided with a clamping piece (201b), the connecting end (201a) is also provided with a groove (201a-1), and the clamping piece (201b) is clamped and connected with the groove (201a-1).

2. The dual power supply line fault removal method according to claim 1, characterized in that: The switch under test is in the closed position and in the second state; the adjacent switch on the left is in the closed position and in the second state; the adjacent switch on the right is in the closed position and in the first state; the switch under test is determined to be a fault removal switch.

3. The dual power supply line fault removal method according to claim 1 or 2, characterized in that: The switch under test is in the closed position and in the second state; the adjacent switch on the right is in the closed position and in the second state; the adjacent switch on the left is in the closed position and in the first state; the switch under test is determined to be a fault removal switch.

4. The dual power supply line fault removal method according to claim 3, characterized in that: A first telescopic member (203a-1) is arranged at the top of the first wiring port (203a), and a first conductive member (203a-2) is arranged at the bottom of the first wiring port (203a), wherein the first conductive member (203a-2) and the current-carrying conductor (202) are fixedly connected.

5. The dual power supply line fault removal method as claimed in claim 4, characterized in that: A second telescopic member (204a-1) is arranged at the top of the second wiring port (204a), and a second conductive member (204a-2) is arranged at the bottom of the second wiring port (204a), wherein the second conductive member (204a-2) and the current-carrying conductor (202) are fixedly connected.

6. The dual power supply line fault removal method according to claim 4, characterized in that: The first telescopic member (203a-1) has a first conductor (203a-11) disposed on its bottom and a first through hole (203a-12) disposed in the middle. The first electric wire (205) is clamped between the first conductive member (203a-2) and the first conductor (203a-11).

7. The dual power supply line fault removal method according to claim 5, characterized in that: The second telescopic member (204a-1) has a second conductor (204a-11) disposed on its bottom and a second through hole (204a-12) disposed in the middle. The second electric wire (206) is clamped between the second conductive member (204a-2) and the second conductor (204a-11).

8. The dual power supply line fault removal method according to claim 1, characterized in that: The clamping piece (201b) is provided with an elastic protrusion (201b-1), the connecting end (201a) is provided with a limiting groove (201a-2), and the elastic protrusion (201b-1) cooperates with the limiting groove (201a-2).

9. The dual power supply line fault removal method according to claim 8, characterized in that: The clamping member (201b) is also provided with an elastic sheet (201b-2), and the connecting end (201a) is also provided with a clamping slot (201a-3), and the elastic sheet (201b-2) cooperates with the clamping slot (201a-3).

10. The dual power supply line fault removal method according to claim 9, characterized in that: The support frame (201) is also provided with a protective shell (201c), and the protective shell (201c) is detachably connected to the clamping member (201b).

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