CN216215896U - Fault correction device of power cable cross-connection box - Google Patents

Abstract

The utility model relates to a fault correction device of a power cable cross interconnection box, which comprises an inner core connecting mechanism, an inner core electrode interconnection circuit, an outer core connecting mechanism, a grounding switching circuit and a control mechanism which are connected in sequence, wherein the phase sequence switching circuit is connected in series in a series branch; the input ends of all phases of the inner core electrode interconnection circuit are respectively connected with two switchers, one of the switchers is connected with the output end of the corresponding phase, and the other switchers are sequentially connected in series to form a loop; the input end and the output end of each phase of the outer core electrode interconnection circuit are directly connected, the input end of each phase is also connected with a switcher, and the switchers are sequentially connected in series to form a loop. Compared with the prior art, the utility model realizes the online correction of two faults including transposition phase sequence misconnection and coaxial cable inner and outer core misconnection, and can effectively ensure the safety of cable lines and operators; the device can be split into a plurality of sets of devices, the volume of the devices is reduced, and the devices can be matched and used at will according to the field environment.

Description

Fault correction device of power cable cross-connection box

Technical Field

The utility model relates to the field of power cable cross-connection boxes, in particular to a fault correction device of a power cable cross-connection box.

Background

As shown in fig. 1, in a power cable, especially an XLPE cable, two cross-connection boxes are arranged in each three-section power cable line, cross-connection between cable sheaths with different phase sequences is realized through a built-in transposition arrangement, and correct and appropriate cross-connection transposition connection is achieved, so that influences of sheath induced current and induced voltage, such as heating and insulation breakdown, can be effectively suppressed. As shown in fig. 2, due to engineering quality and other reasons, when the sheath of the power cable is cross-connected, a wrong phase-change arrangement and a wrong connection of the coaxial cable may occur, which mainly includes a wrong phase-sequence connection of the coaxial cable of the grounding wire, a wrong phase-change arrangement and a wrong connection of the inner and outer core electrodes of the coaxial cable, so that the sum of induced electromotive force vectors of the sheath of three sections of cables is large, and thus a large sheath current is formed, resulting in heat loss and insulation degradation. Other faults generated in operation, such as theft of transposition devices and the like, also have certain influence on the cable system.

At present, a method for processing a cross-connection fault of a power cable is conservative, namely after power supply of a cable line is stopped, a transposition arrangement is corrected, so that the influence on a power user is large, and particularly, the cable line with a higher voltage level is more obvious; the transposition row can be detached for a short time at the trough time of electricity utilization under the condition that safety protection measures are reliable, so that the node is in a suspended state, the electricity consumption is low, the induced voltage and the induced current are low, the obvious damage to operators and a cable system can not be caused generally, and the operation is not recommended unless in an emergency. It can be seen that the difficulty of correcting the cross-connection fault of the power cable on line is that the power supply current of the cable line is large, so that the induced voltage and the induced current of the sheath are large, large electric arcs and overshoot voltages can be generated when the transposition bar is disassembled and assembled, and great damage is caused to operators and the cable system.

The utility model discloses a utility model with publication number CN108957202A discloses an adopt ground connection box online correction method of transition junction box for online correction trouble junction box double-phase transposition misconnection trouble specifically includes following step: 1) detecting whether the grounding box has a two-phase transposition wiring fault, if so, performing the step 2), and if not, returning to the step 1); 2) the cable insulation joint of the fault grounding box is respectively connected into a transition junction box through 3 grounding wire coaxial cables on the transition junction box, and the wiring mode of the transition junction box is consistent with that of a normal grounding box, namely, the default wiring mode; 3) disassembling the fault grounding box on line and correcting the wiring mode of the fault grounding box; 4) and connecting the corrected grounding box into a grounding system on line, and disassembling the transition junction box to finish the correction of the two-phase transposition wiring fault of the fault junction box.

The grounding box online correction method can only process the phase misconnection of the transposition row and the coaxial cable, but is not suitable for the misconnection of the exchange of the inner core electrode and the outer core electrode of the coaxial cable. The control mechanism adopted by the scheme can only be suitable for simple phase interchange control, and cannot realize a complex control mode. The scheme adopts the current-limiting resistor as a measure for limiting the generation of electric arcs, and the current-limiting function is sufficiently realized by depending on the self impedance of the connecting lead in actual use. Meanwhile, the contactor with high switching power is adopted, so that the direct grounding operation can be completely realized without a transition state.

The utility model discloses a but multi-functional earthing device of high tension cable of monitoring load state, its characterized in that for CN 104104029B's utility model: the air switch comprises a first protection circuit U1, a second protection circuit U2, air switches K7-K9 and connecting terminals P1-P6; the first protection circuit comprises protectors R1-R3, voltmeters V1-V3, ammeters A1-A3, air switches K1-K3 and wiring terminals P11-P13; the second protection circuit comprises protectors R4-R6, voltmeters V4-V6, ammeters A4-A6, air switches K4-K6 and connecting terminals P21-P23.

The device adopts six change-over switches to realize the online access mode and online fault correction of the direct grounding box and the cross interconnection box, and realizes the functions of the direct grounding box and the protective resistor thereof by utilizing the matching mode of the change-over switches and the protective resistor. The scheme realizes the cross interconnection mode of positive phase sequence and negative phase sequence by means of manual wiring and exchanging wiring phase sequence, and is manually operated completely by the experience of operators, so that secondary errors of wiring are easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a fault correction device of a power cable cross interconnection box, which can process the faults of transposition arrangement phase sequence misconnection and coaxial cable inner and outer core misconnection.

The purpose of the utility model can be realized by the following technical scheme:

a fault correction device of a power cable cross interconnection box comprises an inner core connecting mechanism, an outer core connecting mechanism, a phase sequence switching circuit, a grounding switching circuit and a control mechanism, and further comprises an inner core electrode interconnection circuit and an outer core electrode interconnection circuit, wherein the inner core connecting mechanism, the inner core electrode interconnection circuit, the outer core electrode interconnection circuit and the outer core connecting mechanism are sequentially connected to form a series branch, and the phase sequence switching circuit is connected in series in the series branch;

the first phase A input end of the inner core electrode interconnection circuit is respectively connected with a first phase A phase inverter and a second phase A phase inverter, the first phase B input end of the inner core electrode interconnection circuit is respectively connected with a first phase B phase inverter and a second phase B phase inverter, the first phase C input end of the inner core electrode interconnection circuit is respectively connected with a first phase C phase inverter and a second phase C phase inverter, the first phase A phase inverter, the first phase B phase inverter and the first phase C phase inverter are sequentially connected in series to form a loop, and the second phase A phase inverter, the second phase B phase inverter and the second phase C phase inverter are respectively connected with the output ends of corresponding phases;

the input and the output of each phase of outer core electrode interconnect circuit directly link, the second A looks input of outer core electrode interconnect circuit still is connected with third A looks switcher, second B looks input still is connected with third B looks switcher, second C looks input still is connected with third C looks switcher, third A looks switcher, third B looks switcher and third C looks switcher establish ties in proper order and constitute the return circuit.

Further, the inner core electrode interconnection circuit, the phase sequence switching circuit and the outer core electrode interconnection circuit are sequentially connected; the input end of each phase of the phase sequence switching circuit is respectively connected with the output end of each phase of the inner core electrode interconnection circuit, and the output end of each phase of the phase sequence switching circuit is respectively connected with the input end of each phase of the outer core electrode interconnection circuit.

Further, the inner core connecting mechanism, the phase sequence switching circuit, the inner core electrode interconnection circuit and the outer core electrode interconnection circuit are sequentially connected; the output end of each phase of the inner core connecting mechanism is respectively connected with the input end of each phase of the phase sequence switching circuit, and the output end of each phase of the phase sequence switching circuit is respectively connected with the input end of each phase of the inner core electrode interconnection circuit.

Further, the phase sequence switching circuit comprises a positive phase sequence switch, a negative phase sequence switch, an inner core grounding switch and an outer core grounding switch,

the input end of the positive phase-sequence switcher is connected with the common input end of the phase-sequence switching circuit, and the output end of the positive phase-sequence switcher is connected with the common output end of the phase-sequence switching circuit through a positive phase-sequence wiring line;

the input end of the reverse phase sequence switcher is connected with the public input end of the phase sequence switching circuit, and the output end of the reverse phase sequence switcher is connected with the public output end of the phase sequence switching circuit through a reverse phase sequence wiring circuit;

the input end of the inner core grounding switcher is connected with the common input end of the phase sequence switching circuit, and the output end of the inner core grounding switcher is grounded;

the input end of the outer core grounding switcher is grounded, and the output end of the outer core grounding switcher is connected with the public output end of the phase sequence switching circuit.

Further, the positive phase-sequence wiring line includes:

the A-phase output end of the positive phase-sequence switcher is connected with the B-phase common output end of the phase-sequence switching circuit,

the B-phase output end of the positive phase-sequence switcher is connected with the C-phase common output end of the phase-sequence switching circuit,

the C-phase output end of the positive phase sequence switcher is connected with the A-phase common output end of the phase sequence switching circuit;

the reverse phase sequence wiring line includes:

the A phase output end of the reverse phase sequence switcher is connected with the C phase common output end of the phase sequence switching circuit,

the B phase output end of the reverse phase sequence switcher is connected with the A phase common output end of the phase sequence switching circuit,

and the C-phase output end of the reverse phase sequence switcher is connected with the B-phase common output end of the phase sequence switching circuit.

Further, positive phase sequence switch, negative phase sequence switch, inner core earthing switch and outer core earthing switch are tripolar contactor subsidiary outage delay relay.

Further, the control mechanism comprises a programmable controller and an intermediate relay group which are connected with each other, and the intermediate relay group is respectively connected with the inner core electrode interconnection circuit, the outer core electrode interconnection circuit and the phase sequence switching circuit.

Further, the inner core connecting mechanism comprises a first A-phase clamp, a first B-phase clamp, a first C-phase clamp, a first inner core connecting three-phase cable and a first three-phase terminal seat, one end of each of the first A-phase clamp, the first B-phase clamp and the first C-phase clamp is connected with the inner core electrode of the cross interconnection box, the other end of each of the first A-phase clamp, the first B-phase clamp and the first C-phase clamp is connected with the live wire end of the first inner core connecting three-phase cable, and the first inner core connecting three-phase cable is connected with the first three-phase terminal seat.

Further, outer core coupling mechanism includes that second A looks anchor clamps, second B looks anchor clamps, second C looks anchor clamps, second inner core connect three-phase cable and second three-phase terminal seat, second A looks anchor clamps, second B looks anchor clamps and the equal one end of second C looks anchor clamps are connected the outer core electrode of cross interconnection box, and the other end is connected the live wire end of three-phase cable is connected to the second inner core, the three-phase cable of second inner core connection is connected the second three-phase terminal seat.

Compared with the prior art, the utility model has the following advantages:

(1) the inner core and outer core circuits are led out from the cross interconnection box through the inner core connection mechanism and the outer core connection mechanism, and the inner core electrode interconnection circuit and the outer core electrode interconnection circuit formed by the switcher can realize the switching of the inner core electrode and the outer core electrode of any coaxial cable; the switching of positive phase sequence and negative phase sequence is realized through a phase sequence switching circuit; the function of a cross interconnection box can be temporarily replaced, and meanwhile, the performance research and other experimental researches of other grounding systems can be carried out; the utility model realizes online correction of the transposition arranging and misconnecting faults, including two types of faults of transposition arranging phase sequence misconnection and coaxial cable inner and outer core misconnection, and keeps the connection point in a non-floating state all the time through the grounding switching circuit, thereby effectively ensuring the safety of cable lines and operators;

(2) the utility model can flexibly match and connect the phase sequence switching circuit, the inner core electrode interconnection circuit and the outer core electrode interconnection circuit, can be disassembled and combined, and realizes the miniaturization and convenience of equipment.

(3) The operation is simple and convenient, the operation error correction function can be set, and the equipment or the injured personnel are not easy to damage;

(4) a direct grounding state is provided, so that the safety of operators is guaranteed, and the generation of electric arcs is effectively inhibited;

(5) the power-off delay relay is adopted for assistance, so that the phase sequence switching process is always in a non-suspension state, and the generation of contact electric arc is further inhibited;

(6) after the phase sequence is switched to be correct, the transposition rows are installed under the equipotential condition, and no arc is generated.

Drawings

FIG. 1 is a schematic diagram of a normal cross-connect configuration within a cross-connect box;

FIG. 2 is a schematic diagram of a coaxial cable of a ground line with a wrong phase sequence;

FIG. 3 is a schematic diagram of a transposition order phase sequence alignment;

FIG. 4 is a schematic diagram of the inner and outer core electrode pair misconnection of a coaxial cable;

fig. 5 is a schematic view showing a connection structure of a fault correcting apparatus of a power cable cross-connecting box according to an embodiment of the present invention;

FIG. 6 is a block diagram of the components of the core attachment mechanism in an embodiment of the present invention;

FIG. 7 is a block diagram of the outer core attachment mechanism in an embodiment of the present invention;

FIG. 8 is a block diagram of a phase sequence switching circuit according to an embodiment of the present invention;

FIG. 9 is a block diagram of a phase sequence switching circuit according to an embodiment of the present invention;

FIG. 10 is a block diagram showing the components of an electrical interconnection circuit for core electrodes in an embodiment of the present invention;

FIG. 11 is a block diagram showing the components of an external core electrode interconnection circuit according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a first connection state of the fault correction apparatus according to the embodiment of the present invention;

FIG. 13 is a diagram illustrating a second connection state of the fault correction device in accordance with the embodiment of the present invention;

fig. 14 is a schematic view of a third connection state of the fault correction device in the embodiment of the present invention;

fig. 15 is a diagram illustrating a fourth connection state of the failure correction apparatus according to the embodiment of the present invention;

in the figure, 1, an inner core connection mechanism, 2, an outer core connection mechanism, 3, an inner core electrode interconnection circuit, 301, a first phase A input terminal of the inner core electrode interconnection circuit, 302, a first phase B input terminal of the inner core electrode interconnection circuit, 303, a first phase C input terminal of the inner core electrode interconnection circuit, 304, a first phase A switcher, 305, a second phase A switcher, 306, a first phase B switcher, 307, a second phase B switcher, 308, a first phase C switcher, 309, a second phase C switcher, 310, an phase A output terminal of the inner core electrode interconnection circuit, 311, a phase B output terminal of the inner core electrode interconnection circuit, 312, a phase C output terminal of the inner core electrode interconnection circuit, 4, an outer core electrode interconnection circuit, 401, a second phase A input terminal of the outer core electrode interconnection circuit, 402, a second phase B input terminal of the outer core electrode interconnection circuit, 403, a second phase C input terminal of the outer core electrode interconnection circuit, 404. a third phase-a converter, 405, a third phase-B converter, 406, a third phase-C converter, 407, an phase-a output end of the outer core electrode interconnection circuit, 408, a phase-B output end of the outer core electrode interconnection circuit, 409, a phase-C output end of the outer core electrode interconnection circuit, 5, a phase sequence switching circuit, 501, a phase-a input end of the phase sequence switching circuit, 502, a phase-B input end of the phase sequence switching circuit, 503, a phase-C input end of the phase sequence switching circuit, 504, a positive phase sequence switch, 505, an inverse phase sequence switch, 506, an inner core ground switch, 507, an outer core ground switch, 508, a phase-a output end of the phase sequence switching circuit, 509, a phase-B output end of the phase sequence switching circuit, 510, a phase-C output end of the phase sequence switching circuit, 6, a ground switching circuit, 7, a control mechanism, 701, a programmable controller, 702, and an intermediate relay group.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

The embodiment provides a fault correction device of a power cable cross-connection box, which comprises an inner core connection mechanism 1, an outer core connection mechanism 2, an inner core electrode interconnection circuit 3, an outer core electrode interconnection circuit 4, a phase sequence switching circuit 5, a grounding switching circuit 6 and a control mechanism 7, wherein the inner core connection mechanism 1, the inner core electrode interconnection circuit 3, the outer core electrode interconnection circuit 4 and the outer core connection mechanism 2 are sequentially connected to form a series branch, and the phase sequence switching circuit 5 is connected in the series branch in series;

a first phase-A input end 301 of the inner core electrode interconnection circuit 3 is respectively connected with a first phase-A converter 304 and a second phase-A converter 305, a first phase-B input end 302 is respectively connected with a first phase-B converter 306 and a second phase-B converter 307, a first phase-C input end 303 is respectively connected with a first phase-C converter 308 and a second phase-C converter 309, the first phase-A converter 304, the first phase-B converter 306 and the first phase-C converter 308 are sequentially connected in series to form a loop, and the second phase-A converter 305, the second phase-B converter 307 and the second phase-C converter 309 are respectively connected with output ends of corresponding phases;

the input end and the output end of each phase of the outer core electrode interconnection circuit 4 are directly connected, the second phase A input end 401 of the outer core electrode interconnection circuit 4 is further connected with a third phase A phase inverter 404, the second phase B input end 402 is further connected with a third phase B inverter 405, the second phase C input end 403 is further connected with a third phase C inverter 406, and the third phase A inverter, the third phase B inverter 405 and the third phase C inverter 406 are sequentially connected in series to form a loop.

The inner core connecting mechanism 1 is used for connecting the inner core electrodes 91 of the cross interconnection box 9; the outer core connection mechanism 2 is for connecting the outer core electrodes 92 of the cross-connection box 9; the phase sequence switching circuit 5 is used for switching three phase sequence states of positive phase sequence, reverse phase sequence and direct grounding; the inner core connecting mechanism 1, the outer core connecting mechanism 2, the inner core electrode interconnecting circuit 3, the outer core electrode interconnecting circuit 4 and the phase sequence switching circuit 5 are connected in series; the connection positions of the inner core electrode interconnection circuit 3, the outer core electrode interconnection circuit 4 and the phase sequence switching circuit 5 can be interchanged; the connecting positions of the inner core connecting mechanism 1 and the outer core connecting mechanism 2 can be interchanged; the phase-sequence switching circuit 5 is connected to the ground potential through the ground electrode 8; the control mechanism 7 controls the connection state of the entire apparatus.

As a preferred embodiment, the inner core electrode interconnection circuit 3, the phase sequence switching circuit 5, and the outer core electrode interconnection circuit 4 are connected in this order; the input ends of all phases of the phase sequence switching circuit 5 are respectively connected with the output ends of all phases of the inner core electrode interconnection circuit 3, and the output ends of all phases of the phase sequence switching circuit 5 are respectively connected with the input ends of all phases of the outer core electrode interconnection circuit 4.

This example illustrates three implementations:

when the inner core electrode and the outer core electrode of the cable with the same axis a are in wrong connection and the phase sequence of the transposed bronze medal is correct, the cross-connection state is as shown in the right side of fig. 4, and the correct correction mode is that, under the condition of power failure, the transposed row is reconnected only in the cross-connection box according to the wiring mode of fig. 8, so that the inner core electrode interconnection circuit 3 and the outer core electrode interconnection circuit 4 are required to realize the connection state of the right half part of fig. 8.

Specifically, when the first phase-C phase-cut converter 308 is closed, the third phase-a phase-cut converter 404 is closed, the second phase-B phase-cut converter 307 is closed, the other switches are opened, and the phase-sequence switching circuit 5 is switched to the correct phase-sequence state, the connection state can be the connection state in the right half of fig. 8.

As shown in fig. 9, similarly, when the pair of the inner and outer core electrodes of the cable having the same axis B is misconnected and the phase sequence of the transposed brass plate is correct, the correction method is to close the first phase-a converter 304, close the third phase-B converter 405, close the second phase-C converter 309, open the other converters, and switch the phase sequence switching circuit 5 to the correct phase sequence state, so that the connection state can be the connection state on the right side of fig. 9.

As shown in fig. 10, similarly, when the pair of the inner and outer core electrodes of the C coaxial cable is misconnected and the phase sequence of the transposed brass plate is correct, the correction method is to close the second phase-a converter 305, close the first phase-B converter 306, close the third phase-a converter 404, open the other converters, and switch the phase sequence switching circuit 5 to the correct phase sequence state, so that the connection state can be the connection state on the right side of fig. 10.

As a preferred embodiment, the inner core connection mechanism 1, the phase sequence switching circuit 5, the inner core electrode interconnection circuit 3, and the outer core electrode interconnection circuit 4 are connected in sequence; the output ends of all phases of the inner core connecting mechanism 1 are respectively connected with the input ends of all phases of the phase sequence switching circuit 5, and the output ends of all phases of the phase sequence switching circuit 5 are respectively connected with the input ends of all phases of the inner core electrode interconnection circuit 3.

As shown in fig. 11, a combination of the phase-sequence switching circuit 5, the inner core electrode interconnection circuit 3, and the outer core electrode interconnection circuit 4 in series order is used. When the inner and outer core electrodes of the cable with the same axis a are in wrong connection and the phase sequence of the transposed brass plate is correct, the correction method is to close the first phase-a converter 304, close the second phase-C converter 309, close the third phase-a converter 404, open the other converters, and switch the phase sequence switching circuit 5 to the correct phase sequence state, so that the connection state can be the connection state on the right side of fig. 11.

Similarly, the other series connection sequences of the phase sequence switching circuit 5, the inner core electrode interconnection circuit 3 and the outer core electrode interconnection circuit 4 correspond to the corresponding control and switching modes, and the flexible collocation mode can be realized only by writing the control mechanism 7 according to the preset sequence and the corresponding switch state of the switcher.

As a preferred embodiment, the phase-sequence switching circuit 5 includes a positive phase-sequence switch 504, a negative phase-sequence switch 505, an inner core ground switch 506 and an outer core ground switch 507,

the input end of the positive phase-sequence switch 504 is connected to the common input end of the phase-sequence switch circuit 5, and the output end of the positive phase-sequence switch 504 is connected to the common output end of the phase-sequence switch circuit 5 through a positive phase-sequence wiring line;

the input end of the reverse phase-sequence switch 505 is connected with the common input end of the phase-sequence switch circuit 5, and the output end of the reverse phase-sequence switch 505 is connected with the common output end of the phase-sequence switch circuit 5 through a reverse phase-sequence wiring line;

the input end of the core ground switch 506 is connected to the common input end of the phase sequence switching circuit 5, and the output end of the core ground switch 506 is grounded;

the input terminal of the outer core ground switch 507 is grounded, and the output terminal of the outer core ground switch 507 is connected to the common output terminal of the phase sequence switching circuit 5.

As a preferred embodiment, the positive-phase-sequence wiring line includes:

the a-phase output terminal of the positive phase-sequence switcher 504 is connected to the B-phase common output terminal of the phase-sequence switching circuit 5,

the B-phase output terminal of the positive phase-sequence switcher 504 is connected to the C-phase common output terminal of the phase-sequence switching circuit 5,

the C-phase output terminal of the positive phase-sequence switch 504 is connected to the a-phase common output terminal of the phase-sequence switch circuit 5;

the reverse phase sequence wiring line includes:

the a-phase output terminal of the phase-reversal switch 505 is connected to the C-phase common output terminal of the phase-sequence switching circuit 5,

the B-phase output terminal of the inverted-phase-sequence switch 505 is connected to the a-phase common output terminal of the phase-sequence switching circuit 5,

the C-phase output terminal of the phase-reversal switcher 505 is connected to the B-phase common output terminal of the phase-sequence switching circuit 5.

In a preferred embodiment, the positive phase-sequence switch 504, the negative phase-sequence switch 505, the inner core grounding switch 506 and the outer core grounding switch 507 are three-pole contactors with power-off delay relays.

In the embodiment, the model of the three-pole contactor is CKJ5-400A/1140V, the model of the attached power-off delay relay is LADR0, and the power-off delay is set to be 0.5 second.

In a preferred embodiment, the control mechanism 7 includes a programmable controller 701 and an intermediate relay group 702 connected to each other, and the intermediate relay group 702 is connected to the inner core electrode interconnection circuit 3, the outer core electrode interconnection circuit 4, and the phase sequence switching circuit 5, respectively.

As a preferred embodiment, the core connection mechanism 1 includes a first a-phase jig 101, a first B-phase jig 102, a first C-phase jig 103, a first core connection three-phase cable 104, and a first three-phase terminal block 105, the first a-phase jig 101, the first B-phase jig 102, and the first C-phase jig 103 have one end connected to the core electrode 91 of the cross interconnection box 9, the other end connected to the live wire end of the first core connection three-phase cable 104, and the first core connection three-phase cable 104 connected to the first three-phase terminal block 105.

As a preferred embodiment, the outer core connection mechanism 2 includes a second a-phase jig 201, a second B-phase jig 202, a second C-phase jig 203, a second inner core connection three-phase cable 204, and a second three-phase terminal block 205, wherein the second a-phase jig 201, the second B-phase jig 202, and the second C-phase jig 203 have one ends connected to the outer core electrodes 92 of the cross interconnection box 9, the other ends connected to the live wire ends of the second inner core connection three-phase cable 204, and the second inner core connection three-phase cable 204 connected to the second three-phase terminal block 205.

The use principle of the correction device of the utility model is as follows: the power cable cross interconnection repair device and the original cross interconnection box 9 are connected in parallel to a cross interconnection system of the power cable, induction voltage of a transposition row of the interconnection box is greatly reduced by switching to a direct grounding state so as to protect operating personnel, meanwhile, induction current mainly passes through the power cable cross interconnection repair device which is temporarily connected, a short circuit effect is formed on the transposition row, electric arcs when the transposition row is detached are effectively reduced, positive phase sequence, reverse phase sequence and coaxial cable inner and outer core electrode exchange can be switched after the original cross interconnection box 9 is replaced, the interconnection system is enabled to recover a correct cross interconnection state, and the transposition row is installed in an equipotential state so as to eliminate the electric arcs.

The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. The fault correction device of the power cable cross interconnection box comprises an inner core connecting mechanism (1), an outer core connecting mechanism (2), a phase sequence switching circuit (5), a grounding switching circuit (6) and a control mechanism (7), and is characterized by further comprising an inner core electrode interconnection circuit (3) and an outer core electrode interconnection circuit (4), wherein the inner core connecting mechanism (1), the inner core electrode interconnection circuit (3), the outer core electrode interconnection circuit (4) and the outer core connecting mechanism (2) are sequentially connected to form a series branch, and the phase sequence switching circuit (5) is connected in series in the series branch;

a first phase A input end (301) of the inner core electrode interconnection circuit (3) is respectively connected with a first phase A converter (304) and a second phase A converter (305), a first phase B input end (302) is respectively connected with a first phase B converter (306) and a second phase B converter (307), a first phase C input end (303) is respectively connected with a first phase C converter (308) and a second phase C converter (309), the first phase A converter (304), the first phase B converter (306) and the first phase C converter (308) are sequentially connected in series to form a loop, and the second phase A converter (305), the second phase B converter (307) and the second phase C converter (309) are respectively connected with output ends of corresponding phases;

the input and the output of each phase of outer core electrode interconnect circuit (4) directly link, second A looks input (401) of outer core electrode interconnect circuit (4) still is connected with third A looks converter (404), second B looks input (402) still is connected with third B looks converter (405), second C looks input (403) still is connected with third C looks converter (406), third A looks converter, third B looks converter (405) and third C looks converter (406) are established ties in proper order and are constituted the return circuit.

2. A fault-correcting device of a power cable cross-connecting box according to claim 1, characterized in that the inner core electrode interconnection circuit (3), the phase sequence switching circuit (5) and the outer core electrode interconnection circuit (4) are connected in sequence; the input ends of all phases of the phase sequence switching circuit (5) are respectively connected with the output ends of all phases of the inner core electrode interconnection circuit (3), and the output ends of all phases of the phase sequence switching circuit (5) are respectively connected with the input ends of all phases of the outer core electrode interconnection circuit (4).

3. A fault-correcting device of a power cable cross-connecting box according to claim 1, characterized in that the inner core connection mechanism (1), the phase sequence switching circuit (5), the inner core electrode interconnection circuit (3) and the outer core electrode interconnection circuit (4) are connected in sequence; the output ends of all phases of the inner core connecting mechanism (1) are respectively connected with the input ends of all phases of the phase sequence switching circuit (5), and the output ends of all phases of the phase sequence switching circuit (5) are respectively connected with the input ends of all phases of the inner core electrode interconnection circuit (3).

4. A fault-correction arrangement for a power cable cross-connect box according to any of claims 1-3, characterized in that the phase-sequence switching circuit (5) comprises a positive phase-sequence switch (504), a negative phase-sequence switch (505), an inner core earth switch (506) and an outer core earth switch (507),

the input end of the positive phase-sequence switcher (504) is connected with the common input end of the phase-sequence switching circuit (5), and the output end of the positive phase-sequence switcher (504) is connected with the common output end of the phase-sequence switching circuit (5) through a positive phase-sequence wiring line;

the input end of the reverse phase-sequence switcher (505) is connected with the common input end of the phase-sequence switching circuit (5), and the output end of the reverse phase-sequence switcher (505) is connected with the common output end of the phase-sequence switching circuit (5) through a reverse phase-sequence wiring line;

the input end of the core grounding switcher (506) is connected with the common input end of the phase sequence switching circuit (5), and the output end of the core grounding switcher (506) is grounded;

the input end of the outer core grounding switch (507) is grounded, and the output end of the outer core grounding switch (507) is connected with the common output end of the phase sequence switching circuit (5).

5. The apparatus for fault correction of a power cable cross-connect box according to claim 4, wherein said positive-phase-sequence wiring line comprises:

an A-phase output terminal of the positive phase-sequence switcher (504) is connected to a B-phase common output terminal of the phase-sequence switching circuit (5),

the B-phase output end of the positive phase-sequence switcher (504) is connected with the C-phase common output end of the phase-sequence switching circuit (5),

the C-phase output end of the positive phase-sequence switcher (504) is connected with the A-phase common output end of the phase-sequence switching circuit (5).

6. A fault-correction arrangement for a power cable cross-connect box according to claim 4, wherein the reverse-phase wiring line comprises:

the A phase output end of the reverse phase sequence switcher (505) is connected with the C phase common output end of the phase sequence switching circuit (5),

the B phase output end of the reverse phase sequence switcher (505) is connected with the A phase common output end of the phase sequence switching circuit (5),

the C-phase output end of the reverse phase sequence switcher (505) is connected with the B-phase common output end of the phase sequence switching circuit (5).

7. A fault-correction device for power cable cross-connect box according to claim 4, characterized in that the positive phase-sequence switch (504), the negative phase-sequence switch (505), the inner core grounding switch (506) and the outer core grounding switch (507) are three-pole contactor attached outage delay relays.

8. A fault-correcting device of a power cable cross-connection box according to claim 1, characterized in that the control mechanism (7) comprises a programmable controller (701) and an intermediate relay group (702) connected with each other, and the intermediate relay group (702) is connected with the inner core electrode interconnection circuit (3), the outer core electrode interconnection circuit (4) and the phase sequence switching circuit (5) respectively.

9. A fault-correcting device of a power cable cross-connecting box according to claim 1, characterized in that the core connecting mechanism (1) comprises a first a-phase clamp (101), a first B-phase clamp (102), a first C-phase clamp (103), a first core connecting three-phase cable (104) and a first three-phase terminal block (105), the first a-phase clamp (101), the first B-phase clamp (102) and the first C-phase clamp (103) have one end connected to the core electrode (91) of the cross-connecting box (9) and the other end connected to the live wire end of the first core connecting three-phase cable (104), and the first core connecting three-phase cable (104) is connected to the first three-phase terminal block (105).

10. A fault-correcting device of a power cable cross-connecting box according to claim 1, characterized in that the outer core connecting mechanism (2) comprises a second a-phase clamp (201), a second B-phase clamp (202), a second C-phase clamp (203), a second inner core connecting three-phase cable (204) and a second three-phase terminal block (205), the second a-phase clamp (201), the second B-phase clamp (202) and the second C-phase clamp (203) have one end connected to the outer core electrode (92) of the cross-connecting box (9), the other end connected to the live wire end of the second inner core connecting three-phase cable (204), and the second inner core connecting three-phase cable (204) connected to the second three-phase terminal block (205).

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