Power distribution switch polarity non-power-cut adjusting device based on electromagnetic induction

Abstract

The utility model relates to a power distribution switch polarity non-power-cut adjusting device based on electromagnetic induction, which comprises three phase current transformers and a zero sequence current transformer, and is connected in series between a six-core open circuit prevention aviation plug and a socket of a power distribution terminal. In other words, the current transformers are respectively connected in series in loops of phase current and zero-sequence current on the secondary side of the switch body, and the four current transformers invert the direction of the current on the secondary side of the switch body based on the electromagnetic induction principle so as to correct the polarity of the distribution switch with the reversed polarity. According to the device, the wiring and the structure of the switch body side are not required to be modified, the power distribution terminal structure and internal module installation are not required to be modified, the modification cost is low, and the electric shock risk of a human body is effectively reduced. In addition, the polarity of the switch can be adjusted by installing the device without power failure, so that the working efficiency of on-site team members is greatly improved, and high efficiency and burden reduction of team work are comprehensively realized.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution automation, in particular to a non-power-off adjustment device for polarity of a power distribution switch based on electromagnetic induction. Background Art

[0002] The feeder terminal device is an intelligent terminal device installed in the distribution room or on the feeder. It is used to measure the parameters of the feeder, monitor and protect the feeder in the distribution system, communicate with the distribution automation master station, and control the opening and closing of the distribution switch. At present, the existing distribution switches on site have the phenomenon of reverse installation of switches, which causes the switch polarity to be reversed, seriously affecting the accuracy of the current signal call measurement, and then causing the relevant functions of the terminal device to fail. For example, the small current alarm signal that relies on the current to start the single-phase grounding analysis cannot be correctly alarmed, and then the feeder operation status cannot be monitored in real time, affecting the normal operation of the entire system. Although some newly installed terminals in the past two years can adjust the switch polarity by setting parameter values, there are still a large number of existing devices that cannot adjust the switch polarity in this way. For these switches, if the installation direction of a large number of existing switches with reverse polarity is adjusted through the power outage maintenance plan, it will not only increase the risk points of personnel climbing operations, but also the inefficiency of manual adjustment, which will extend the entire maintenance cycle and make it difficult to achieve the expected results, resulting in a double waste of time and resources. If the installation direction of existing switches with reverse polarity is adjusted by live working, the safety risk of electric shock for workers increases. Once an erroneous operation occurs, it may easily cause the line to trip and power outage, and even cause a large-scale power outage in the area. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a distribution switch polarity adjustment device based on electromagnetic induction without power outage, so as to improve the safety, efficiency and effectiveness of the distribution switch polarity adjustment operation and realize efficient reduction of the work load of the team.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a distribution switch polarity non-stop power adjustment device based on electromagnetic induction, including a first-phase current transformer, a second-phase current transformer, a third-phase current transformer and a zero-sequence current transformer; the distribution switch polarity non-stop power adjustment device is connected in series between the aviation plug on the switch body side and the aviation socket on the distribution terminal side; the first-phase current transformer, the second-phase current transformer and the third-phase current transformer are respectively connected in series to the loop of the phase current on the secondary side of the switch body; the zero-sequence current transformer is connected in series to the loop of the zero-sequence current.

[0005] In a preferred embodiment, the first-phase current transformer, the second-phase current transformer, and the third-phase current transformer are current transformers with a transformation ratio of 1:1, which are respectively connected in series in the current loops of each phase on the secondary side of the switch body. Based on the principle of electromagnetic induction, new phase currents of equal magnitude and opposite directions are generated on the secondary side of the current transformer.

[0006] In a preferred embodiment, the zero-sequence current transformer is a current transformer with a transformation ratio of 1:1, which is connected in series in the zero-sequence current loop on the secondary side of the switch body. Based on the principle of electromagnetic induction, a new zero-sequence current of equal magnitude and opposite direction is generated on the secondary side of the current transformer.

[0007] In a preferred embodiment, the aviation plug on the switch body side and the aviation socket on the power distribution terminal side both include a first three-phase circuit input terminal, a second three-phase circuit input terminal, a third three-phase circuit input terminal, a three-phase circuit common terminal, a zero-sequence current input terminal and a zero-sequence current common terminal.

[0008] In a preferred embodiment, the input end of the distribution switch polarity non-stop adjustment device is an aviation socket, including a first connection end, a second connection end, a third connection end, a fourth connection end, a fifth connection end and a sixth connection end; the first connection end, the second connection end, the third connection end, the fourth connection end, the fifth connection end and the sixth connection end are respectively connected to the first three-phase circuit input end, the second three-phase circuit input end, the third three-phase circuit input end, the three-phase circuit common end, the zero-sequence current input end and the zero-sequence current common end of the aviation plug on the switch body side.

[0009] In a preferred embodiment, the output end of the distribution switch polarity non-stop adjustment device is an aviation plug, including a seventh connection terminal, an eighth connection terminal, a ninth connection terminal, a tenth connection terminal, an eleventh connection terminal and a twelfth connection terminal; the seventh connection terminal, the eighth connection terminal, the ninth connection terminal, the tenth connection terminal, the eleventh connection terminal and the twelfth connection terminal are respectively connected to the first three-phase circuit input terminal, the second three-phase circuit input terminal, the third three-phase circuit input terminal, the three-phase circuit common terminal, the zero-sequence current input terminal and the zero-sequence current common terminal of the aviation socket on the distribution terminal side.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] (1) No need to modify the switch body and terminals. The device does not require modification of the wiring and structure of the switch body, nor does it require modification of the distribution terminal structure and internal module installation. The modification project and modification cost are small, and the risk of electric shock is effectively reduced.

[0012] (2) The polarity of the power distribution switch can be adjusted during installation without power outage. The device can be installed without power outage to adjust the polarity of the power distribution switch, greatly improving the work efficiency of on-site team members and fully realizing the efficient reduction of the team's work burden. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a 6-core open circuit prevention aviation plug of a power distribution terminal in an embodiment of the utility model.

[0014] Figure 2 It is a structural principle diagram of a device for adjusting polarity of a power distribution switch without power outage according to an embodiment of the utility model. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0017] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0018] A non-stop polarity adjustment device for power distribution switches based on electromagnetic induction, reference Figure 1-2 , including a first-phase current transformer TAa', a second-phase current transformer TAb', a third-phase current transformer TAc' and a zero-sequence current transformer TAo'; the non-stop polarity adjustment device of the distribution switch is connected in series between the aviation plug on the switch body side and the aviation socket on the distribution terminal side; the first-phase current transformer TAa', the second-phase current transformer TAb' and the third-phase current transformer TAc' are respectively connected in series to the loop of the phase current on the secondary side of the switch body; the zero-sequence current transformer TAo' is connected in series to the loop of the zero-sequence current. The first-phase current transformer TAa', the second-phase current transformer TAb', the third-phase current transformer TAc' and the zero-sequence current transformer TAo' reverse the direction of the secondary-side current of the switch body based on the principle of electromagnetic induction, thereby correcting the polarity of the distribution switch with reverse polarity.

[0019] The first-phase current transformer TAa', the second-phase current transformer TAb', and the third-phase current transformer TAc' are current transformers with a transformation ratio of 1:1, and are respectively connected in series in the current loops of each phase on the secondary side of the switch body, that is, they are connected in series in the loops where the secondary windings of the first-phase current transformer TAa on the switch body side, the second-phase current transformer TAb on the switch body side, and the third-phase current transformer TAc on the switch body side are located. Based on the principle of electromagnetic induction, the secondary sides of the first-phase current transformer TAa', the second-phase current transformer TAb', and the third-phase current transformer TAc' generate new phase currents that are equal in magnitude to the secondary side currents of the first-phase current transformer TAa on the switch body side, the second-phase current transformer TAb on the switch body side, and the third-phase current transformer TAc on the switch body side, but opposite in direction. The current is input into the distribution terminal to achieve the purpose of polarity reversal adjustment of the distribution switch.

[0020] The zero-sequence current transformer TAo' is a current transformer with a transformation ratio of 1:1, and is connected in series in the zero-sequence current loop on the secondary side of the switch body, that is, in series in the loop where the secondary winding of the zero-sequence current transformer TAo on the switch body side is located. Based on the principle of electromagnetic induction, the secondary side of the zero-sequence current transformer TAo' generates a new zero-sequence current that is equal in magnitude to the zero-sequence current on the secondary side of the zero-sequence current transformer TAo on the switch body side, but opposite in direction. This current is input into the distribution terminal to achieve the purpose of reversing the polarity of the distribution switch.

[0021] The switch body side aviation plug and the power distribution terminal side aviation socket both include a first three-phase circuit input terminal, a second three-phase circuit input terminal, a third three-phase circuit input terminal, a three-phase circuit common terminal, a zero-sequence current input terminal and a zero-sequence current common terminal. Specifically, the switch body side aviation plug includes 6 pins, which are pins I A , Pin I B , Pin I C , Pin I N1 , Pin I O , Pin I N2 , where pin I A , Pin I B , Pin I C They are the first three-phase circuit input terminal, the second three-phase circuit input terminal, and the third three-phase circuit input terminal, respectively. Pin I N1 It is the common terminal of the phase circuit, pin I O It is the zero-sequence current input terminal, pin I N2 It is the zero-sequence current common terminal. The aviation socket on the switch body side also includes 6 pins, which are pins I A '、Pin I B '、Pin I C '、Pin I N1 '、Pin I O '、Pin I N2', where pin I A '、Pin I B '、Pin I C ' are respectively the first three-phase circuit input terminal, the second three-phase circuit input terminal, and the third three-phase circuit input terminal, and pin I N1 ' is the common end of the phase circuit, pin I O ' is the zero-sequence current input terminal, pin I N2 ' is the common terminal of zero-sequence current.

[0022] The input end of the distribution switch polarity adjustment device without power outage is an aviation socket, which is used to connect with the aviation plug on the switch body side; the output end of the distribution switch polarity adjustment device without power outage is an aviation plug, which is used to connect with the aviation socket on the distribution terminal side.

[0023] Specifically, the input end of the non-stop power-off adjustment device for the power distribution switch polarity is an aviation socket, including a first connection terminal I a , the second connection terminal I b , the third connection terminal I c , the fourth connection terminal I n1 , the fifth connection terminal I o and the sixth connection terminal I n2 The first connection terminal I a , the second connection terminal I b , the third connection terminal I c , the fourth connection terminal I n1 , the fifth connection terminal I o and the sixth connection terminal I n2 They are respectively connected to the first three-phase circuit input terminal, the second three-phase circuit input terminal, the third three-phase circuit input terminal, the three-phase circuit common terminal, the zero-sequence current input terminal and the zero-sequence current common terminal of the aviation plug on the switch body side.

[0024] The output end of the non-stop power-off adjustment device for the polarity of the power distribution switch is an aviation plug, including a seventh connection terminal I a ', the eighth connection terminal I b ', the ninth connection terminal I c ', tenth connection terminal I n1 ', eleventh connection terminal I o ' and the twelfth connection terminal I n2 '; The seventh connection terminal I a ', the eighth connection terminal I b ', the ninth connection terminal I c ', tenth connection terminal I n1 ', eleventh connection terminal I o ' and the twelfth connection terminal I n2'Respectively connected to the first three-phase circuit input terminal, the second three-phase circuit input terminal, the third three-phase circuit input terminal, the three-phase circuit common terminal, the zero-sequence current input terminal and the zero-sequence current common terminal of the aviation socket on the power distribution terminal side.

[0025] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A non-stop polarity adjustment device for a power distribution switch based on electromagnetic induction, characterized in that: It includes a first-phase current transformer, a second-phase current transformer, a third-phase current transformer and a zero-sequence current transformer; the distribution switch polarity non-stop adjustment device is connected in series between the aviation plug on the switch body side and the aviation socket on the distribution terminal side; the first-phase current transformer, the second-phase current transformer and the third-phase current transformer are respectively connected in series to the loop of the phase current on the secondary side of the switch body; the zero-sequence current transformer is connected in series to the loop of the zero-sequence current.

2. The non-stop polarity adjustment device for a power distribution switch based on electromagnetic induction according to claim 1 is characterized in that: The first-phase current transformer, the second-phase current transformer, and the third-phase current transformer are current transformers with a transformation ratio of 1:1, which are respectively connected in series in the current loops of each phase on the secondary side of the switch body. Based on the principle of electromagnetic induction, new phase currents of equal magnitude and opposite directions are generated on the secondary side of the current transformer.

3. The non-stop polarity adjustment device for power distribution switches based on electromagnetic induction according to claim 1 is characterized in that: The zero-sequence current transformer is a current transformer with a transformation ratio of 1:1, which is connected in series in the zero-sequence current loop on the secondary side of the switch body. Based on the principle of electromagnetic induction, a new zero-sequence current of equal magnitude and opposite direction is generated on the secondary side of the current transformer.

4. The non-stop polarity adjustment device for power distribution switches based on electromagnetic induction according to claim 1 is characterized in that: The switch body side aviation plug and the power distribution terminal side aviation socket both include a first three-phase circuit input terminal, a second three-phase circuit input terminal, a third three-phase circuit input terminal, a three-phase circuit common terminal, a zero-sequence current input terminal and a zero-sequence current common terminal; The input end of the non-stop power-off adjustment device for the polarity of the power distribution switch is an aviation socket, including a first connection end, a second connection end, a third connection end, a fourth connection end, a fifth connection end and a sixth connection end; the first connection end, the second connection end, the third connection end, the fourth connection end, the fifth connection end and the sixth connection end are respectively connected to the first three-phase circuit input end, the second three-phase circuit input end, the third three-phase circuit input end, the three-phase circuit common end, the zero-sequence current input end and the zero-sequence current common end of the aviation plug on the switch body side; The output end of the distribution switch polarity non-stop power adjustment device is an aviation plug, including a seventh connection terminal, an eighth connection terminal, a ninth connection terminal, a tenth connection terminal, an eleventh connection terminal and a twelfth connection terminal; the seventh connection terminal, the eighth connection terminal, the ninth connection terminal, the tenth connection terminal, the eleventh connection terminal and the twelfth connection terminal are respectively connected to the first three-phase circuit input terminal, the second three-phase circuit input terminal, the third three-phase circuit input terminal, the three-phase circuit common terminal, the zero-sequence current input terminal and the zero-sequence current common terminal of the aviation socket on the distribution terminal side.

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