A method for locating faults in dual power supply lines

Abstract

The present invention discloses a method for locating 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; the switch under test, the adjacent switch on the left, and the adjacent switch on the right 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, 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. The device of the present invention can more easily determine the specific location of the fault point on the line by utilizing the structure of the cable junction box and detecting the states of the switch under test and the adjacent switches on its left and right sides when a fault occurs at a certain point in the line under the dual-power supply mode.

Description

Technical Field

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

[0002] The power system usually locates the fault point of 6kV and above distribution lines or 35kV and above transmission lines based on the power supply and single power supply. When two power supply points supply power to the same line at the same time, when locating the fault when the line fails, the positioning method based on the power supply cannot be used to determine; when a fault occurs at a certain point in the line under dual power supply mode, it is urgent to determine the specific location of the fault point on the line. 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 location method, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is to provide a method for locating line faults in a dual power supply mode by using switches as a reference.

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

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

[0012] The installation unit comprises a box body and a cover detachably connected to the box body;

[0013] The wiring unit is arranged in the box body, and includes a support frame fixedly arranged at the bottom of the box body, a power-carrying conductor fixedly arranged at the bottom of the support frame, an A wiring terminal arranged at one side of the power-carrying conductor, a B wiring terminal arranged at a side of the power-carrying conductor away from the A wiring terminal, a first wire detachably connected to the A wiring terminal, and a second wire detachably connected to the B wiring terminal, so that the power-carrying conductor, the first wire, and the second wire are detachably electrically connected to each other;

[0014] 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 on the bottom of the first wiring port, wherein the first conductive member is fixedly connected to the current-carrying conductor;

[0015] The B terminal includes a second wiring port disposed on the support frame, a second telescopic member disposed on the top of the second wiring port, and a second conductive member disposed on the bottom of the second wiring port, wherein the second conductive member is fixedly connected to the current-carrying conductor;

[0016] 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.

[0017] As a preferred solution of the dual power supply line fault locating method described in the present invention, wherein: when the switch under test is in the closed position, it is in the first state; the left adjacent switch is in the closed position, it is in the second state; it is judged that the fault point is on the right side of the left adjacent switch, that is, the fault point is between the switch under test and the left adjacent switch.

[0018] As a preferred solution of the dual power supply line fault locating method described in the present invention, wherein: when the switch under test is in the closed position, it is in the first state; the right adjacent switch is in the closed position, it is in the second state; it is judged that the fault point is on the left side of the right adjacent switch, that is, the fault point is between the switch under test and the right adjacent switch.

[0019] As a preferred solution of the dual power supply line fault locating method described in the present invention, wherein: when the switch under test is in the closed position, it is in the second state; the left adjacent switch is in the closed position, it is in the first state; it is judged that the fault point is on the right side of the left adjacent switch, that is, the fault point is between the switch under test and the left adjacent switch.

[0020] As a preferred solution of the dual power supply line fault locating method described in the present invention, wherein: when the switch under test is in the closed position, it is in the second state; the right adjacent switch is in the closed position, it is in the first state; it is judged that the fault point is on the left side of the right adjacent switch, that is, the fault point is between the switch under test and the right adjacent switch.

[0021] As a preferred solution of the dual power supply line fault locating method of the present invention, a clamping piece is further provided on the support frame, 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 locating 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 locating 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 locating method described in 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 locating method of the present invention, wherein: an elastic sheet is further provided on the clamping member, a card slot is further provided on the connecting end, and the elastic sheet cooperates with the card slot.

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

[0027] The beneficial effects of the present invention are as follows: when a fault occurs at a certain point in the line under the dual power supply mode, the present invention utilizes the structure of the cable junction box and detects the states of the switch under test and the adjacent switches on its left and right sides, thereby making it easier to determine the specific location of 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 1 A schematic diagram of a line fault for locating a dual power supply line fault.

[0030] Figure 2 A schematic diagram of adjacent switches for locating faults in a dual power supply line.

[0031] Figure 3 A cross-sectional view of a cable junction box for locating a fault in a dual power supply line.

[0032] Figure 4 The figure is a cross-sectional view of the A terminal of the dual power supply line fault locating method.

[0033] Figure 5 The figure is a cross-sectional view of the B terminal of the dual power supply line fault locating method.

[0034] Figure 6 A cross-sectional view of a connection end of a dual power supply line fault locating 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 dual-power supply line fault locating method.

[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 respectively in the closed position; the status of the switch under test, the adjacent switch on the left and the adjacent switch on the right are detected, the first status is that the relay protection device is not started, and the second status is that the relay protection device is started, to determine whether a short circuit occurs between the lines.

[0042] When the switch under test is in the closed position, it is in the first state; the adjacent switch on the left is in the closed position, it is in the second state; it is judged that the fault point is on the right side of the adjacent switch on the left, that is, the fault point is between the switch under test and the adjacent switch on the left.

[0043] When the switch under test is in the closed position, it is in the first state; the adjacent switch on the right is in the closed position, it is in the second state; it is judged that the fault point is on the left side of the adjacent switch on the right, that is, the fault point is between the switch under test and the adjacent switch on the right.

[0044] When the switch under test is in the closed position, it is in the second state; the adjacent switch on the left is in the closed position, it is in the first state; it is judged that the fault point is on the right side of the adjacent switch on the left, that is, the fault point is between the switch under test and the adjacent switch on the left.

[0045] When the switch under test is in the closed position, it is in the second state; the adjacent switch on the right is in the closed position and is in the first state; it is judged that the fault point is on the left side of the adjacent switch on the right, that is, the fault point is between the switch under test and the adjacent switch on the right.

[0046] 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 .

[0047] 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.

[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 current-carrying conductor 202 fixedly arranged at the bottom of the support frame 201, an A terminal 203 arranged on one side of the current-carrying conductor 202, a B terminal 204 arranged on the side of the current-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 current-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, snapping, etc.

[0049] Preferably, 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, and the first conductive member 203a-2 is fixedly connected to the current-carrying conductor 202, and 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] Furthermore, a clamping member 201b is provided on the support frame 201, and a groove 201a-1 is provided on the connecting end 201a. The clamping member 201b is engaged with the groove 201a-1, and the bottom of the clamping member 201b is inserted into the groove 201a-1 for engagement.

[0053] Preferably, 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 conductive member 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 status 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 then the specific location of the line fault point is determined.

[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] Specific fault location method:

[0064] 1. Fault occurs at point F1.

[0065] Switch 1 is in the closed position and the protection device is in action. The adjacent switch on its right is switch 2, which is in the closed position and the protection device is not in action, satisfying the positioning condition of "no fault is detected in all the adjacent closed switches on the right", so the fault point is on the right side of switch 1. There is no adjacent switch on its left side.

[0066] 2. Fault occurs at point F1.

[0067] Switch 2 is in the closed position and the protection device is not activated. The adjacent switch on its left is switch 2. Switch 1 is in the closed position and the protection device is activated, which meets the positioning condition of "one and only one of all the closed switches on the left side detects a fault", so the fault point is on the left side of switch 2.

[0068] 3. Fault occurs at point F2.

[0069] Switch 2 is in the closed position and the protection device is in operation. The adjacent switch on its left is switch 1, which is in the closed position and the protection device is in operation, which does not meet the positioning condition of "no fault is detected in all closed switches on the left", so the fault point is not on the left side of switch 2. The adjacent switches on its right are switches 3 and 7, which are in the closed position and the protection device is not in operation, which meets the positioning condition of "no fault is detected in all closed switches on the right", so the fault point is on the right side of switch 2.

[0070] 4. Fault occurs at point F2.

[0071] Switch 3 is in the closed position and the protection device is not activated. The adjacent switches on its left are switches 2 and 7. Switch 2 is in the closed position and the protection device is activated, and switch 7 is in the closed position and the protection device is not activated. The positioning condition of "one and only one of all the closed switches on the left side detects a fault" is met, so the fault point is on the left side of switch 3.

[0072] 5. The principles of fault points F3 and F5 are the same as those of F1, as described in points 1 and 2 above.

[0073] 6. The principle of F4 fault point is the same as F2, as described in points 3 and 4 above.

[0074] 7. Fault occurs at point F6.

[0075] Switch 7 is in the closed position and the protection device is activated. The adjacent switches on its right are switches 2, 3 and 8. Switches 2, 3 and 8 are in the closed position and the protection device of switch 2 is activated. The positioning condition of "no fault is detected in all the adjacent closed switches on the right side" is not met, so the fault point is not on the right side of switch 7. There is no adjacent switch on its left side. At this time, it is judged that the fault point is on the left side of switch 7.

[0076] 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 dual power supply line fault location method, 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; 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); The wiring unit (200) is arranged in the box body (101), comprising a support frame (201) fixedly arranged at the bottom of the box body (101), a current-carrying conductor (202) fixedly arranged at the bottom of the support frame (201), an A wiring terminal (203) arranged at one side of the current-carrying conductor (202), a B wiring terminal (204) arranged at a side of the current-carrying 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 current-carrying conductor (202), the first wire (205), and the second wire (206) are detachably electrically connected; The A wiring terminal (203) comprises 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), wherein the first conductive member (203a-2) and the current-carrying conductor (202) are fixedly connected; The B wiring terminal (204) comprises 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) being fixedly connected to the current-carrying conductor (202); and, The support frame (201) is also provided with a connection end (201a), and the connection end (201a) is arranged between the first wiring port (203a) and the second wiring port (204a); The support frame (201) is further provided with a clamping piece (201b), and the connection end (201a) is further provided with a groove (201a-1), and the clamping piece (201b) is clamped and connected with the groove (201a-1); 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, and the first electric wire (205) is clamped between the first conductive member (203a-2) and the first conductor (203a-11); 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, and the second electric wire (206) is clamped between the second conductive member (204a-2) and the second conductor (204a-11); 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); The clamping piece (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).

2. The dual power supply line fault location method according to claim 1, characterized in that: When the switch under test is in the closed position, it is in the first state; the left adjacent switch is in the closed position, it is in the second state; it is determined that the fault point is on the right side of the left adjacent switch, that is, the fault point is between the switch under test and the left adjacent switch.

3. The dual power supply line fault location method according to claim 1 or 2, characterized in that: When the switch under test is in the closed position, it is in the first state; when the adjacent switch on the right is in the closed position, it is in the second state; it is determined that the fault point is on the left side of the adjacent switch on the right, that is, the fault point is between the switch under test and the adjacent switch on the right.

4. The dual power supply line fault location method according to claim 1, characterized in that: When the switch under test is in the closed position, it is in the second state; the left adjacent switch is in the closed position, it is in the first state; it is determined that the fault point is on the right side of the left adjacent switch, that is, the fault point is between the switch under test and the left adjacent switch.

5. The dual power supply line fault location method according to claim 1 or 4, characterized in that: When the switch under test is in the closed position, it is in the second state; the right adjacent switch is in the closed position, it is in the first state; it is determined that the fault point is on the left side of the right adjacent switch, that is, the fault point is between the switch under test and the right adjacent switch.

6. The dual power supply line fault location method according to claim 1, 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).

Images