An automatic shorting device, CT current loop

Abstract

The application discloses an automatic short-circuit device and a CT current loop, the device is arranged correspondingly with each-phase current transformer CT conducting plate, the conducting plate comprises a first conducting plate and a second conducting plate; the automatic short-circuit device comprises an overvoltage control module, a short-circuit control module and a short-circuit execution module; the overvoltage control module is used for controlling the short-circuit control module to work when the voltage between the first conducting plate and the second conducting plate is overvoltage; the short-circuit execution module is connected with the second conducting plate, the short-circuit control module is connected with the overvoltage control module, the short-circuit control module is used for driving the short-circuit execution module to execute a short-circuit operation according to the control of the overvoltage control module, so as to short-circuit each second conducting plate of adjacent phases; the first conducting plate and the second conducting plate are connected through current terminals. The automatic short-circuit device can realize the short-circuit of the current transformer CT conducting plate when the current transformer CT conducting plate is open.

Description

Technical Field

[0001] This invention relates to the field of current transformer circuit technology, and in particular to an automatic short-circuit device and a CT current loop. Background Technology

[0002] Current transformers (CTs) are special converters used in substations to transform a large primary current in the power grid into a proportional secondary current. Therefore, an open circuit in a current transformer affects power safety and the stable operation of the substation.

[0003] Currently, when the CT current circuit is working, a method of pre-short-circuiting is generally used to avoid the CT current circuit from being open. Automatic short-circuiting cannot be achieved when the CT current circuit is open. Summary of the Invention

[0004] This invention provides an automatic short-circuit device and a CT current circuit to solve the problem that automatic short-circuiting cannot be achieved when the CT current circuit is open.

[0005] According to one aspect of the present invention, an automatic short-circuit device is provided, which is correspondingly arranged with the conductive plates of each phase current transformer (CT), wherein the conductive plates include a first conductive plate and a second conductive plate; the automatic short-circuit device includes an overvoltage control module, a short-circuit control module, and a short-circuit execution module.

[0006] The overvoltage control module is connected to the first conductive plate and the second conductive plate. The overvoltage control module is used to control the short-circuit control module to work when the voltage between the first conductive plate and the second conductive plate is overvoltage.

[0007] The short-circuit execution module is connected to the second conductive plate, and the short-circuit control module is connected to the overvoltage control module. The short-circuit control module is used to drive the short-circuit execution module to perform a short-circuit operation according to the control of the overvoltage control module, so as to short-circuit each of the second conductive plates of adjacent phases.

[0008] The first conductive plate and the second conductive plate are connected via current terminals.

[0009] Optionally, the short-circuit execution module includes a first end and at least one second end, and an elastic portion connected to the first end and the second end; the short-circuit control module is used to release the second end according to the control of the overvoltage control module, and the elastic portion drives the second end to contact and connect with the second end of the short-circuit execution module arranged adjacent to it.

[0010] Optionally, the overvoltage control module includes an overvoltage relay; the two ends of the electromagnetic coil of the overvoltage relay are respectively connected to the first conductive plate and the second conductive plate, the first end of the contact of the overvoltage relay is connected to the positive terminal of the power supply, the second end of the contact of the overvoltage relay is connected to the first terminal of the short-circuit control module, and the second terminal of the short-circuit control module is connected to the negative terminal of the power supply; when the contact of the overvoltage relay is closed, the short-circuit control module is energized, and the short-circuit control module releases the short-circuit execution module to perform the short-circuit operation.

[0011] Optionally, the short-circuit control module includes a first electromagnet, a second electromagnet, a first spring, and an insulating baffle; the first end of the first electromagnet and the first end of the second electromagnet are connected to the first end of the short-circuit control module, and the second end of the first electromagnet and the second end of the second electromagnet are connected to the second end of the short-circuit control module; the first spring is connected between the first electromagnet and the second electromagnet, and the insulating baffle is connected to the second electromagnet; when the electromagnetic module is energized, the first electromagnet and the second electromagnet attract and compress the first spring, causing the insulating baffle to release the short-circuit execution module.

[0012] Optionally, the shorting execution module includes a conductive rod, a shorting piece, and a second spring; the conductive rod is fixed to the second conductive plate, and the second spring is connected between the conductive rod and the shorting piece.

[0013] Optionally, the shorting tabs between adjacent phases are configured as paired snap-fit ​​structures; the shorting tabs between adjacent phases are used for contact connection.

[0014] According to another aspect of the present invention, a CT current circuit is provided, the CT current circuit including the CT conductive plates of each phase current transformer and the automatic short-circuiting device; the CT current circuit includes an A-phase circuit, a B-phase circuit, a C-phase circuit and an N-phase circuit.

[0015] Optionally, the A-phase circuit includes a first A-phase conductive plate, a second A-phase conductive plate, an A-phase current terminal, an A-phase conductive rod, an A-phase shorting piece, an A-phase insulating baffle, a first A-phase electromagnet, a second A-phase electromagnet, a first A-phase spring, a second A-phase spring, an overvoltage relay, and a power supply. The A-phase current terminal connects the first A-phase conductive plate and the second A-phase conductive plate. The electromagnetic coil of the overvoltage relay is connected between the first A-phase conductive plate and the second A-phase conductive plate. The first end of the overvoltage relay's contact is connected to the positive terminal of the power supply. The second end of the overvoltage relay's contact is connected to the first end of the first A-phase electromagnet and the first end of the second A-phase electromagnet. The second ends of the first A-phase electromagnet and the second A-phase electromagnet are connected to the negative terminal of the power supply. The first A-phase spring is connected between the first A-phase electromagnet and the second A-phase electromagnet. The second A-phase spring is connected between the A-phase conductive rod and the A-phase shorting piece. The A-phase conductive rod is connected to the second A-phase conductive plate. The A-phase insulating baffle is connected to the second A-phase electromagnet.

[0016] Optionally, the B-phase circuit includes a first B-phase conductive plate, a second B-phase conductive plate, a B-phase current terminal, a B-phase conductive rod, a first B-phase shorting piece, a second B-phase shorting piece, a first B-phase insulating baffle, a second B-phase insulating baffle, a first B-phase electromagnet, a second B-phase electromagnet, a third B-phase electromagnet, a fourth B-phase electromagnet, a first B-phase spring, a second B-phase spring, a third B-phase spring, a fourth B-phase spring, an overvoltage relay, and a power supply; the B-phase current terminal is used to connect the first B-phase conductive plate and the second B-phase conductive plate; the electromagnetic coil of the overvoltage relay is connected between the first B-phase conductive plate and the second B-phase conductive plate; the first end of the contact of the overvoltage relay is connected to the positive terminal of the power supply; the second end of the contact of the overvoltage relay is connected to the first end of the first B-phase electromagnet and the first end of the second B-phase electromagnet; the second end of the first B-phase electromagnet and the... The second end of the second B-phase electromagnet is connected to the negative terminal of the power supply, and the first B-phase spring is connected between the first B-phase electromagnet and the second B-phase electromagnet; the second end of the overvoltage relay contact is connected to the first end of the third B-phase electromagnet and the first end of the fourth B-phase electromagnet, the second ends of the third B-phase electromagnet and the fourth B-phase electromagnet are connected to the negative terminal of the power supply, and the second B-phase spring is connected between the third B-phase electromagnet and the fourth B-phase electromagnet; the third B-phase spring is connected between the B-phase conductive rod and the first B-phase shorting piece, the fourth B-phase spring is connected between the B-phase conductive rod and the second B-phase shorting piece, the B-phase conductive rod is connected to the second B-phase conductive plate, the first B-phase insulating baffle is connected to the second B-phase electromagnet, and the second B-phase insulating baffle is connected to the fourth B-phase electromagnet.

[0017] Optionally, the C-phase circuit includes a first C-phase conductive plate, a second C-phase conductive plate, a C-phase current terminal, a C-phase conductive rod, a first C-phase shorting piece, a second C-phase shorting piece, a first C-phase insulating baffle, a second C-phase insulating baffle, a first C-phase electromagnet, a second C-phase electromagnet, a third C-phase electromagnet, a fourth C-phase electromagnet, a first C-phase spring, a second C-phase spring, a third C-phase spring, a fourth C-phase spring, an overvoltage relay, and a power supply; the C-phase current terminal is used to connect the first C-phase conductive plate and the second C-phase conductive plate; the electromagnetic coil of the overvoltage relay is connected between the first C-phase conductive plate and the second C-phase conductive plate; the first end of the contact of the overvoltage relay is connected to the positive terminal of the power supply; the second end of the contact of the overvoltage relay is connected to the first end of the first C-phase electromagnet and the first end of the second C-phase electromagnet; the second end of the first C-phase electromagnet and the... The second end of the second C-phase electromagnet is connected to the negative terminal of the power supply, and the first C-phase spring is connected between the first C-phase electromagnet and the second C-phase electromagnet; the second end of the contact of the overvoltage relay is connected to the first end of the third C-phase electromagnet and the first end of the fourth C-phase electromagnet, the second ends of the third C-phase electromagnet and the second end of the fourth C-phase electromagnet are connected to the negative terminal of the power supply, and the second C-phase spring is connected between the third C-phase electromagnet and the fourth C-phase electromagnet; the third C-phase spring is connected between the C-phase conductive rod and the first C-phase shorting piece, the fourth C-phase spring is connected between the C-phase conductive rod and the second C-phase shorting piece, the C-phase conductive rod is connected to the second C-phase conductive plate, the first C-phase insulating baffle is connected to the second C-phase electromagnet, and the second C-phase insulating baffle is connected to the fourth C-phase electromagnet.

[0018] Optionally, the N-phase circuit includes a first N-phase conductive plate, a second N-phase conductive plate, an N-phase current terminal, an N-phase conductive rod, an N-phase shorting piece, an N-phase insulating baffle, a first N-phase electromagnet, a second N-phase electromagnet, a first N-phase spring, a second N-phase spring, an overvoltage relay, and a power supply. The N-phase current terminal is used to fix the first N-phase conductive plate and the second N-phase conductive plate together. The electromagnetic coil of the overvoltage relay is connected between the first N-phase conductive plate and the second N-phase conductive plate. The first end of the contact of the overvoltage relay is connected to the positive terminal of the power supply. The second end of the contact of the overvoltage relay is connected to the first end of the first N-phase electromagnet and the first end of the second N-phase electromagnet. The second end of the first N-phase electromagnet and the second N-phase electromagnet are connected to the negative terminal of the power supply. The first N-phase spring is connected between the first N-phase electromagnet and the second N-phase electromagnet. The second N-phase spring is connected between the N-phase conductive rod and the N-phase shorting piece. The N-phase conductive rod is connected to the second N-phase conductive plate. The N-phase insulating baffle is connected to the second N-phase electromagnet.

[0019] This invention provides an automatic short-circuit device, which is correspondingly configured with the conductive plates of each phase current transformer (CT). Each conductive plate includes a first conductive plate and a second conductive plate. The automatic short-circuit device includes an overvoltage control module, a short-circuit control module, and a short-circuit execution module. The overvoltage control module is connected to the first and second conductive plates and controls the short-circuit control module to operate when there is an overvoltage between the first and second conductive plates. The short-circuit execution module is connected to the second conductive plate, and the short-circuit control module is connected to the overvoltage control module. The short-circuit control module drives the short-circuit execution module to perform a short-circuit operation according to the control of the overvoltage control module, thereby short-circuiting each of the second conductive plates in adjacent phases. The first and second conductive plates are connected via current terminals. This invention's automatic short-circuit device can achieve short-circuiting of the current transformer (CT) conductive plates when they are open-circuited, solving the problem that automatic short-circuiting cannot be achieved when the CT current loop is open.

[0020] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the connection between an automatic short-circuiting device and a current transformer (CT) conductive plate provided in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of a short-circuit execution module provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram showing the connection between another automatic short-circuiting device and the conductive plate of the current transformer (CT) provided in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the short-circuit control module provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of another short-circuit execution module provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of a CT current loop provided in an embodiment of the present invention;

[0028] Figure 7 This is a circuit diagram of the CT current loop during normal operation provided in the embodiment of the present invention;

[0029] Figure 8 This is a circuit diagram of the CT current loop when it is short-circuited according to an embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Figure 1 This is a schematic diagram illustrating the connection between an automatic short-circuiting device and the conductive plate of a current transformer (CT) according to an embodiment of the present invention. Figure 1As shown, the automatic short-circuit device 100 is correspondingly arranged with the conductive plates 10 of each phase current transformer (CT). The conductive plates 10 include a first conductive plate 11 and a second conductive plate 12. The automatic short-circuit device 100 includes an overvoltage control module 110, a short-circuit control module 120, and a short-circuit execution module 130. The overvoltage control module 110 is connected to the first conductive plate 11 and the second conductive plate 12. The overvoltage control module 110 is used to control the short-circuit control module 120 to operate when the voltage between the first conductive plate 11 and the second conductive plate 12 is overvoltage. The short-circuit execution module 130 is connected to the second conductive plate 12. The short-circuit control module 120 is connected to the overvoltage control module 110. The short-circuit control module 120 is used to drive the short-circuit execution module 130 to perform a short-circuit operation according to the control of the overvoltage control module 110, so as to short-circuit each second conductive plate 12 of adjacent phases. The first conductive plate 11 and the second conductive plate 12 are connected through current terminals 13.

[0033] In this embodiment, the current transformer (CT), as a special converter in substation operation, can convert a large primary current in the power grid into a proportionally smaller secondary current. Therefore, the secondary circuit of the current transformer (CT) should be kept closed during normal operation. If the secondary circuit of the current transformer (CT) is open, it will affect the power safety of the substation. The conductive plate 10 is the conductive device of the current transformer (CT), and the current terminal 13 is the connecting device that connects the first conductive plate 11 and the second conductive plate 12. The current terminal 13 includes connecting pieces, bolts, and other fixing devices. For example, if the current terminal 13 has quality defects or is loosened due to human contact, it may cause the current transformer (CT) circuit to open. The automatic short-circuit device 100 is a device that short-circuits the conductive plates of adjacent phases when the current transformer (CT) circuit is open. The overvoltage control module 110 is used to detect the voltage between the first conductive plate 11 and the second conductive plate 12 of the current transformer (CT) and realizes conduction based on the detected voltage. For example, the overvoltage control module 110 includes an overvoltage relay. The short-circuit control module 120 controls the operation of the short-circuit execution module 130 based on the conduction state of the overvoltage control module 110. For example, the short-circuit control module 120 includes an electromagnet, etc. The short-circuit execution module 130 executes the short-circuiting of the conductive plates of the current transformers (CTs) of each adjacent phase. For example, the short-circuit execution module 130 includes structures such as short-circuit end faces of each adjacent phase.

[0034] When the current terminal 13 of the current transformer (CT) conductive plate is disconnected, the voltage between the first conductive plate 11 and the second conductive plate 12 increases. The overvoltage control module 110, connected between the first conductive plate 11 and the second conductive plate 12, turns on based on the detected voltage. For example, when the voltage detected by the overvoltage control module 110 is greater than a preset threshold, the voltage control module 110 turns on. When the voltage control module 110 is on, the short-circuit control module 120 drives the short-circuit execution module 130 to perform a short-circuit operation. The short-circuit execution module 130 short-circuits each of the second conductive plates 12 of adjacent phases. When it is necessary to restore the initial state, it can be done manually.

[0035] This embodiment provides an automatic short-circuit device, which is correspondingly arranged with the conductive plates of each phase current transformer (CT). Each conductive plate includes a first conductive plate and a second conductive plate. The automatic short-circuit device includes an overvoltage control module, a short-circuit control module, and a short-circuit execution module. The overvoltage control module is connected to the first and second conductive plates and controls the short-circuit control module to operate when there is an overvoltage between the first and second conductive plates. The short-circuit execution module is connected to the second conductive plate, and the short-circuit control module is connected to the overvoltage control module. The short-circuit control module drives the short-circuit execution module to perform a short-circuit operation according to the control of the overvoltage control module, thereby short-circuiting each of the second conductive plates in adjacent phases. The first and second conductive plates are connected via current terminals. This automatic short-circuit device can achieve short-circuiting of the current transformer (CT) conductive plates when they are open-circuited, solving the problem that automatic short-circuiting cannot be achieved when the CT current loop is open.

[0036] Figure 2 This is a schematic diagram of the structure of a short-circuit execution module provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the short-circuit execution module 130 includes a first end 210 and at least a second end 220, and an elastic portion 230 connected to the first end 210 and the second end 220; the short-circuit control module 120 is used to release the second end 220 according to the control of the overvoltage control module 110, and the second end 220 driven by the elastic portion 230 is in contact with the second end 220 of the adjacent short-circuit execution module 130.

[0037] In this embodiment, the first end 210 is connected to the second conductive plate 12, and the second end 220 is the contact component when the short-circuit execution module 130 performs the short-circuit operation. An elastic component 230 is connected between the first end 210 and the second end 220 to assist in the contact of the second ends 220 of adjacent phases. For example, the elastic component 230 includes an elastic device such as a spring. When the short-circuit execution module 130 performs the short-circuit operation, the second conductive plates 12 of each adjacent phase are short-circuited through the contact connection of their respective second ends 220.

[0038] Figure 3 This is a schematic diagram showing the connection between another automatic short-circuiting device and the conductive plate of the current transformer (CT) provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the overvoltage control module 110 includes an overvoltage relay K1. The two ends of the electromagnetic coil of the overvoltage relay K1 are connected to a first conductive plate 11 and a second conductive plate 12, respectively. The first end a1 of the contact of the overvoltage relay K1 is connected to the positive terminal of the power supply V1, the second end a2 of the contact of the overvoltage relay K1 is connected to the first end a3 of the short-circuit control module 120, and the second end a4 of the short-circuit control module 120 is connected to the negative terminal of the power supply V1. When the contact of the overvoltage relay K1 is closed, the short-circuit control module 120 is energized, and the short-circuit control module 120 releases the short-circuit execution module 130 to perform the short-circuit operation. The two ends of the electromagnetic coil of the overvoltage relay K1 are connected between the first conductive plate 11 and the second conductive plate 12. When the current terminal between the first conductive plate 11 and the second conductive plate 12 is disconnected, the coil of the overvoltage relay K1 is energized, and the contact of the overvoltage relay K1 closes. At this time, the short-circuit control module 120 drives the short-circuit execution module 130 to complete the short-circuit operation.

[0039] Figure 4 This is a schematic diagram of the short-circuit control module provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the short-circuit control module 120 includes a first electromagnet Y1, a second electromagnet Y2, a first spring T1, and an insulating baffle D1. The first end a41 of the first electromagnet Y1 and the first end a42 of the second electromagnet Y2 are connected to the first end a3 of the short-circuit control module 120, and the second end a43 of the first electromagnet Y1 and the second end a44 of the second electromagnet Y2 are connected to the second end a4 of the short-circuit control module 120. The first spring T1 is connected between the first electromagnet Y1 and the second electromagnet Y2, and the insulating baffle D1 is connected to the second electromagnet Y2. When the electromagnetic module is energized, the first electromagnet Y1 and the second electromagnet Y2 attract and compress the first spring T1, causing the insulating baffle D1 to release the short-circuit execution module 130.

[0040] Referring to the above embodiment, when the contacts of the overvoltage relay K1 are closed, the first electromagnet Y1 and the second electromagnet Y2 of the short-circuit control module 120 are energized. At this time, the first electromagnet Y1 and the second electromagnet Y2 attract each other, and the first spring T1 is compressed. The initial position of the insulating baffle D1 is located at the second end 220 of the short-circuit actuator 130 to prevent short circuits when the second ends of adjacent phases accidentally contact each other. When the insulating baffle D1 is driven by the second electromagnet Y2, the short-circuit actuator 130 is released, and the second ends of the short-circuit actuator 130 of adjacent phases contact to achieve short circuit.

[0041] Figure 5 This is a schematic diagram of another short-circuit execution module provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the short-circuit execution module 130 includes a conductive rod B1, a shorting piece P1, and a second spring T2; the conductive rod B1 is fixed to the second conductive plate 12, and the second spring T2 is connected between the conductive rod B1 and the shorting piece P1. (Reference) Figure 2 The conductive rod B1 is equivalent to the first end 210 of the short-circuit execution module 130, the short-circuit piece P1 is equivalent to the second end 220 of the short-circuit execution module 130, and the second spring T2 is equivalent to the elastic part 230 of the short-circuit execution module 130.

[0042] In this configuration, the shorting pieces P1 between adjacent phases are configured as paired snap-fit ​​structures, used for contact connection. The snap-fit ​​structure can be configured as a groove snap-fit ​​structure, ensuring full contact and secure snap-fit ​​when the shorting pieces P1 between adjacent phases come into contact.

[0043] Figure 6 The structure of a CT current loop provided in an embodiment of the present invention is shown in the schematic diagram. Figure 6 As shown, and also refer to Figure 1 The CT current circuit 600 includes current transformer (CT) conductive plates 10 for each phase and an automatic short-circuit device 100. The CT current circuit 600 includes phase A circuit, phase B circuit, phase C circuit, and phase N circuit.

[0044] For example, Figure 7 This is a circuit diagram of the CT current loop during normal operation provided in an embodiment of the present invention. Figure 8 This is a circuit diagram of the CT current loop when short-circuited according to an embodiment of the present invention. Figure 7 , Figure 8As shown, the A-phase circuit includes a first A-phase conductive plate 710, a second A-phase conductive plate 720, an A-phase current terminal 730, an A-phase conductive rod BA1, an A-phase shorting piece PA1, an A-phase insulating baffle DA1, a first A-phase electromagnet YA1, a second A-phase electromagnet YA2, a first A-phase spring TA1 and a second A-phase spring TA2, an overvoltage relay K1, and a power supply V1. The A-phase current terminal 730 is used to connect the first A-phase conductive plate 710 and the second A-phase conductive plate 720. The electromagnetic coil of the overvoltage relay K1 is connected between the first A-phase conductive plate 710 and the second A-phase conductive plate 720. The first end a1 of the contact of the overvoltage relay K1 is connected to the power supply V1. The positive terminal of power source V1, the second end a2 of the overvoltage relay K1 contact is connected to the first end a71 of the first phase A electromagnet YA1 and the first end a72 of the second phase A electromagnet YA2, the second end a73 of the first phase A electromagnet YA1 and the second end a74 of the second phase A electromagnet YA2 are connected to the negative terminal of power source V1, the first phase A spring TA1 is connected between the first phase A electromagnet YA1 and the second phase A electromagnet YA2; the second phase A spring TA2 is connected between the phase A conductive rod BA1 and the phase A shorting piece PA1, the phase A conductive rod BA1 is connected to the second phase A conductive plate 720, and the phase A insulating baffle DA1 is connected to the second phase A electromagnet YA2.

[0045] The B-phase circuit includes a first B-phase conductive plate 740, a second B-phase conductive plate 750, a B-phase current terminal 760, a B-phase conductive rod BB1, a first B-phase shorting piece PB1, a second B-phase shorting piece PB2, a first B-phase insulating baffle DB1, a second B-phase insulating baffle DB2, a first B-phase electromagnet YB1, a second B-phase electromagnet YB2, a third B-phase electromagnet YB3, a fourth B-phase electromagnet YB4, a first B-phase spring TB1, a second B-phase spring TB2, a third B-phase spring TB3, and a fourth B-phase spring T. B4, overvoltage relay K1 and power supply V1; B-phase current terminal 760 is used to connect the first B-phase conductive plate 740 and the second B-phase conductive plate 750. The electromagnetic coil of the overvoltage relay K1 is connected between the first B-phase conductive plate 740 and the second B-phase conductive plate 750. The first end a1 of the contact of the overvoltage relay K1 is connected to the positive terminal of the power supply V1. The second end a2 of the contact of the overvoltage relay K1 is connected to the first end a75 of the first B-phase electromagnet YB1 and the first end a76 of the second B-phase electromagnet YB2. The second terminal a77 of electromagnet YB1 and the second terminal a78 of phase B electromagnet YB2 are connected to the negative terminal of power supply V1. The first phase B spring TB1 is connected between the first phase B electromagnet YB1 and the second phase B electromagnet YB2. The second terminal a2 of the overvoltage relay K1 is connected to the first terminal a79 of the third phase B electromagnet YB3 and the first terminal a80 of the fourth phase B electromagnet YB4. The second terminals a81 of the third phase B electromagnet YB3 and the second terminal a82 of the fourth phase B electromagnet YB4 are connected to the negative terminal of power supply V1. The second B-phase spring TB2 is connected between the third B-phase electromagnet YB3 and the fourth B-phase electromagnet YB4; the third B-phase spring TB3 is connected between the B-phase conductive rod BB1 and the first B-phase shorting piece PB1; the fourth B-phase spring TB3 is connected between the B-phase conductive rod BB1 and the second B-phase shorting piece PB2; the B-phase conductive rod BB1 is connected to the second B-phase conductive plate 750; the first B-phase insulating baffle DB1 is connected to the second B-phase electromagnet YB2; and the second B-phase insulating baffle DB2 is connected to the fourth B-phase electromagnet YB4.

[0046] The C-phase circuit includes a first C-phase conductive plate 770, a second C-phase conductive plate 780, a C-phase current terminal 790, a C-phase conductive rod BC1, a first C-phase shorting piece PC1, a second C-phase shorting piece PC2, a first C-phase insulating baffle DC1, a second C-phase insulating baffle DC2, a first C-phase electromagnet YC1, a second C-phase electromagnet YC2, a third C-phase electromagnet YC3, a fourth C-phase electromagnet YC4, a first C-phase spring TC1, a second C-phase spring TC2, a third C-phase spring TC3, and a fourth C-phase spring T. C4, overvoltage relay K1 and power supply V1; C-phase current terminal 790 is used to connect the first C-phase conductive plate 770 and the second C-phase conductive plate 780. The electromagnetic coil of overvoltage relay K1 is connected between the first C-phase conductive plate 770 and the second C-phase conductive plate 780. The first end a1 of the contact of overvoltage relay K1 is connected to the positive terminal of power supply V1. The second end a2 of the contact of overvoltage relay K1 is connected to the first end a83 of the first C-phase electromagnet YC1 and the first end a84 of the second C-phase electromagnet YC2. The second terminal a85 of electromagnet YC1 and the second terminal a86 of phase C electromagnet YC2 are connected to the negative terminal of power supply V1. The first phase C spring TC1 is connected between the first phase C electromagnet YC1 and the second phase C electromagnet YC1. The second terminal a2 of the contact of overvoltage relay K1 is connected to the first terminal a87 of third phase C electromagnet YC3 and the first terminal a88 of fourth phase C electromagnet YC4. The second terminals a89 of third phase C electromagnet YC3 and the second terminal a90 of fourth phase C electromagnet YC4 are connected to the negative terminal of power supply V1. The second C-phase spring TC2 is connected between the third C-phase electromagnet YC3 and the fourth C-phase electromagnet YC4; the third C-phase spring TC3 is connected between the C-phase conductive rod BC1 and the first C-phase shorting piece PC1; the fourth C-phase spring TC4 is connected between the C-phase conductive rod BC1 and the second C-phase shorting piece PC2; the C-phase conductive rod BC1 is connected to the second C-phase conductive plate 780; the first C-phase insulating baffle DC1 is connected to the second C-phase electromagnet YC2; and the second C-phase insulating baffle DC2 is connected to the fourth C-phase electromagnet YC4.

[0047] The N-phase circuit includes a first N-phase conductive plate 701, a second N-phase conductive plate 702, an N-phase current terminal 703, an N-phase conductive rod BN1, an N-phase shorting piece PN1, an N-phase insulating baffle DN1, a first N-phase electromagnet YN1, a second N-phase electromagnet YN1, a first N-phase spring TN1, a second N-phase spring TN2, an overvoltage relay K1, and a power supply V1. The N-phase current terminal 703 is used to fix the first N-phase conductive plate 701 and the second N-phase conductive plate 702 together. The electromagnetic coil of the overvoltage relay K1 is connected between the first N-phase conductive plate 701 and the second N-phase conductive plate 702. The first end a1 of the contact of the overvoltage relay K1 is connected to the power supply V1. The positive terminal of power source V1, the second end a2 of the overvoltage relay K1 contact is connected to the first end a91 of the first N-phase electromagnet YN1 and the first end a92 of the second N-phase electromagnet YN2, the second end a93 of the first N-phase electromagnet YN1 and the second end a94 of the second N-phase electromagnet YN2 are connected to the negative terminal of power source V1, the first N-phase spring TN1 is connected between the first N-phase electromagnet YN1 and the second N-phase electromagnet YN2; the second N-phase spring TN2 is connected between the N-phase conductive rod BN1 and the N-phase shorting piece PN1, the N-phase conductive rod BN1 is connected to the second N-phase conductive plate 702, and the N-phase insulating baffle DN1 is connected to the second N-phase electromagnet YN2.

[0048] In this embodiment, when any one of the A-phase circuit, B-phase circuit, or C-phase circuit is open, the A-phase circuit, B-phase circuit, and C-phase circuit are connected to the N-phase circuit, and the CT current circuit is short-circuited. When the CT current circuit needs to be restored to its initial state, the shorting pieces connected to the upper and lower phases can be manually pulled out. At this time, the insulating baffles of each phase are restored to their initial positions, that is, the insulating baffles isolate the shorting pieces, preventing short circuits when the shorting pieces of adjacent phases accidentally come into contact. For example, when the A-phase circuit is open, i.e., the first A-phase conductive plate 710 and the second A-phase conductive plate 720 cannot be connected through the A-phase current terminal 730, the electromagnetic coil of the overvoltage relay K1 is energized, the contacts of the overvoltage relay K1 close, the first A-phase electromagnet YA1 and the second A-phase electromagnet YA2 are energized, the first A-phase electromagnet YA1 and the second A-phase electromagnet YA2 attract each other and compress the first A-phase spring TA1, the second A-phase electromagnet YA2 drives the A-phase insulating baffle DA1 to release the A-phase shorting piece PA1, the second A-phase spring TA2 returns from the compressed state to its original state and drives the A-phase circuit. Phase A shorting link PA1 approaches the first B-phase shorting link PB1; the first B-phase electromagnet YB1 and the second B-phase electromagnet YB2 are energized, attracting each other and compressing the first B-phase spring TB1. The second B-phase electromagnet YB2 drives the first B-phase insulating baffle DB1 to release the first B-phase shorting link PB1. The third B-phase spring TB3 returns to its original state from the compressed state and drives the first B-phase shorting link PB1 to approach the A-phase shorting link PA1; the third B-phase electromagnet YB3 and the fourth B-phase electromagnet YB4 are energized. The fourth B-phase electromagnet YB4 attracts and compresses the second B-phase spring TB2. The fourth B-phase electromagnet YB4 drives the second B-phase insulating baffle DB2 to release the second B-phase shorting piece PB2. The fourth B-phase spring TB4 returns to its original state from compression and drives the second B-phase shorting piece PB2 to approach the first C-phase shorting piece PC1. The first C-phase electromagnet YC1 and the second C-phase electromagnet YC2 are energized. The first C-phase electromagnet YC1 and the second C-phase electromagnet YC2 attract and compress the first C-phase spring TC1. The second C-phase electromagnet YC2 drives the first C-phase insulating baffle DC1 to release the second B-phase shorting piece PC1. The first C-phase shorting piece PC1, the third C-phase spring TC3 returns from the compressed state to its original state and drives the first C-phase shorting piece PC1 to approach the second B-phase shorting piece PB2; the third C-phase electromagnet YC3 and the fourth C-phase electromagnet YC4 are energized, the third C-phase electromagnet YC3 and the fourth C-phase electromagnet YC4 attract each other and compress the second C-phase spring TC2, the fourth C-phase electromagnet YC4 drives the second C-phase insulating baffle DC2 to release the second C-phase shorting piece PC2, the fourth C-phase spring TC4 returns from the compressed state to its original state and drives the second C-phase shorting piece PC2 to approach the N-phase shorting piece PN1;The first N-phase electromagnet YN1 and the second N-phase electromagnet YN2 are energized. They attract each other and compress the first N-phase spring TN1. The second N-phase electromagnet YN2 drives the N-phase insulating baffle DN1 to release the N-phase shorting piece PN1. The second N-phase spring TN2 returns to its original state from its compressed state and drives the N-phase shorting piece PN1 to approach the second C-phase shorting piece PC2. At this time, the second A-phase conductive plate is connected to the second N-phase conductive plate through the A-phase conductive rod BA1, the second A-phase spring TA2, the A-phase shorting piece PA1, the first B-phase shorting piece PB1, the third B-phase spring TB3, the B-phase conductive rod BB1, the fourth B-phase spring TB4, the second B-phase shorting piece PB2, the first C-phase shorting piece PC1, the third C-phase spring TC3, the C-phase conductive rod BC1, the fourth C-phase spring TC4, the second C-phase shorting piece PC2, the N-phase shorting piece PN1, the second N-phase spring TN2, and the N-phase conductive rod BN1.

[0049] This invention applies an automatic short-circuit device to the CT current circuit, which automatically short-circuits the CT current circuit when it is open, thus preventing injury to personnel and equipment.

[0050] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0051] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An automatic short-circuit device, characterized in that, The conductive plates are arranged corresponding to the current transformer (CT) conductive plates of each phase, and the conductive plates include a first conductive plate and a second conductive plate; the automatic short-circuit device includes an overvoltage control module, a short-circuit control module and a short-circuit execution module. The overvoltage control module is connected to the first conductive plate and the second conductive plate. The overvoltage control module is used to control the short-circuit control module to work when the voltage between the first conductive plate and the second conductive plate is overvoltage. The short-circuit execution module is connected to the second conductive plate, and the short-circuit control module is connected to the overvoltage control module. The short-circuit control module is used to drive the short-circuit execution module to perform a short-circuit operation according to the control of the overvoltage control module, so as to short-circuit each of the second conductive plates of adjacent phases. The first conductive plate and the second conductive plate are connected via current terminals; wherein, when the current terminal of the current transformer CT conductive plate is disconnected, the voltage between the first conductive plate and the second conductive plate increases; when the voltage detected by the overvoltage control module is greater than a preset threshold, the overvoltage control module is turned on; when the overvoltage control module is turned on, the short-circuit control module drives the short-circuit execution module to perform a short-circuit operation, and the short-circuit execution module short-circuits each of the second conductive plates of adjacent phases; The short-circuit execution module includes a first end and at least one second end, and an elastic part connected to the first end and the second end; the short-circuit control module is used to release the second end according to the control of the overvoltage control module, and the elastic part drives the second end to contact and connect with the second end of the short-circuit execution module arranged adjacent to it; The overvoltage control module includes an overvoltage relay; the two ends of the electromagnetic coil of the overvoltage relay are respectively connected to the first conductive plate and the second conductive plate; the first end of the contact of the overvoltage relay is connected to the positive terminal of the power supply; the second end of the contact of the overvoltage relay is connected to the first terminal of the short-circuit control module; the second terminal of the short-circuit control module is connected to the negative terminal of the power supply; when the contact of the overvoltage relay is closed, the short-circuit control module is energized, and the short-circuit control module releases the short-circuit execution module to perform the short-circuit operation. The short-circuit control module includes a first electromagnet, a second electromagnet, a first spring, and an insulating baffle. The first end of the first electromagnet and the first end of the second electromagnet are connected to the first end of the short-circuit control module, and the second end of the first electromagnet and the second end of the second electromagnet are connected to the second end of the short-circuit control module. The first spring is connected between the first electromagnet and the second electromagnet, and the insulating baffle is connected to the second electromagnet. When the overvoltage relay contacts close, the first electromagnet and the second electromagnet attract and compress the first spring, causing the insulating baffle to release the short-circuit execution module.

2. The automatic short-circuit device according to claim 1, characterized in that, The shorting execution module includes a conductive rod, a shorting piece, and a second spring; the conductive rod is fixed to the second conductive plate, and the second spring is connected between the conductive rod and the shorting piece.

3. The automatic short-circuit device according to claim 2, characterized in that, The shorting tabs between adjacent phases are configured as paired snap-fit ​​structures; the shorting tabs between adjacent phases are used for contact connection.

4. A CT current circuit, characterized in that, The CT current circuit includes the CT conductive plate of each phase current transformer and the automatic short-circuit device as described in any one of claims 1-3; the CT current circuit includes the A-phase circuit, the B-phase circuit, the C-phase circuit and the N-phase circuit.

5. The CT current circuit according to claim 4, characterized in that, The A-phase circuit includes a first A-phase conductive plate, a second A-phase conductive plate, an A-phase current terminal, an A-phase conductive rod, an A-phase shorting piece, an A-phase insulating baffle, a first A-phase electromagnet, a second A-phase electromagnet, a first A-phase spring, a second A-phase spring, an overvoltage relay, and a power supply. The A-phase current terminal connects the first A-phase conductive plate and the second A-phase conductive plate. The electromagnetic coil of the overvoltage relay is connected between the first A-phase conductive plate and the second A-phase conductive plate. The first end of the overvoltage relay's contact is connected to the positive terminal of the power supply. The second end of the overvoltage relay's contact is connected to the first end of the first A-phase electromagnet and the first end of the second A-phase electromagnet. The second ends of the first A-phase electromagnet and the second A-phase electromagnet are connected to the negative terminal of the power supply. The first A-phase spring is connected between the first A-phase electromagnet and the second A-phase electromagnet. The second A-phase spring is connected between the A-phase conductive rod and the A-phase shorting piece. The A-phase conductive rod is connected to the second A-phase conductive plate. The A-phase insulating baffle is connected to the second A-phase electromagnet.

6. The CT current circuit according to claim 4, characterized in that, The B-phase circuit includes a first B-phase conductive plate, a second B-phase conductive plate, a B-phase current terminal, a B-phase conductive rod, a first B-phase shorting piece, a second B-phase shorting piece, a first B-phase insulating baffle, a second B-phase insulating baffle, a first B-phase electromagnet, a second B-phase electromagnet, a third B-phase electromagnet, a fourth B-phase electromagnet, a first B-phase spring, a second B-phase spring, a third B-phase spring, a fourth B-phase spring, an overvoltage relay, and a power supply. The B-phase current terminal connects the first B-phase conductive plate and the second B-phase conductive plate. The electromagnetic coil of the overvoltage relay is connected between the first B-phase conductive plate and the second B-phase conductive plate. The first end of the overvoltage relay's contact is connected to the positive terminal of the power supply. The second end of the overvoltage relay's contact is connected to the first end of the first B-phase electromagnet and the first end of the second B-phase electromagnet. The second end of the first B-phase electromagnet and the first B-phase conductive rod... The second end of the second B-phase electromagnet is connected to the negative terminal of the power supply, and the first B-phase spring is connected between the first B-phase electromagnet and the second B-phase electromagnet; the second end of the overvoltage relay contact is connected to the first end of the third B-phase electromagnet and the first end of the fourth B-phase electromagnet, the second ends of the third B-phase electromagnet and the fourth B-phase electromagnet are connected to the negative terminal of the power supply, and the second B-phase spring is connected between the third B-phase electromagnet and the fourth B-phase electromagnet; the third B-phase spring is connected between the B-phase conductive rod and the first B-phase shorting piece, the fourth B-phase spring is connected between the B-phase conductive rod and the second B-phase shorting piece, the B-phase conductive rod is connected to the second B-phase conductive plate, the first B-phase insulating baffle is connected to the second B-phase electromagnet, and the second B-phase insulating baffle is connected to the fourth B-phase electromagnet.

7. The CT current circuit according to claim 4, characterized in that, The C-phase circuit includes a first C-phase conductive plate, a second C-phase conductive plate, a C-phase current terminal, a C-phase conductive rod, a first C-phase shorting piece, a second C-phase shorting piece, a first C-phase insulating baffle, a second C-phase insulating baffle, a first C-phase electromagnet, a second C-phase electromagnet, a third C-phase electromagnet, a fourth C-phase electromagnet, a first C-phase spring, a second C-phase spring, a third C-phase spring, a fourth C-phase spring, an overvoltage relay, and a power supply. The C-phase current terminal connects the first C-phase conductive plate and the second C-phase conductive plate. The electromagnetic coil of the overvoltage relay is connected between the first C-phase conductive plate and the second C-phase conductive plate. The first end of the overvoltage relay's contact is connected to the positive terminal of the power supply. The second end of the overvoltage relay's contact is connected to the first end of the first C-phase electromagnet and the first end of the second C-phase electromagnet. The second end of the first C-phase electromagnet and the first C-phase conductive rod... The second end of the second C-phase electromagnet is connected to the negative terminal of the power supply, and the first C-phase spring is connected between the first C-phase electromagnet and the second C-phase electromagnet; the second end of the overvoltage relay contact is connected to the first end of the third C-phase electromagnet and the first end of the fourth C-phase electromagnet, the second ends of the third C-phase electromagnet and the fourth C-phase electromagnet are connected to the negative terminal of the power supply, and the second C-phase spring is connected between the third C-phase electromagnet and the fourth C-phase electromagnet; the third C-phase spring is connected between the C-phase conductive rod and the first C-phase shorting piece, the fourth C-phase spring is connected between the C-phase conductive rod and the second C-phase shorting piece, the C-phase conductive rod is connected to the second C-phase conductive plate, the first C-phase insulating baffle is connected to the second C-phase electromagnet, and the second C-phase insulating baffle is connected to the fourth C-phase electromagnet.

8. The CT current circuit according to claim 4, characterized in that, The N-phase circuit includes a first N-phase conductive plate, a second N-phase conductive plate, an N-phase current terminal, an N-phase conductive rod, an N-phase shorting piece, an N-phase insulating baffle, a first N-phase electromagnet, a second N-phase electromagnet, a first N-phase spring, a second N-phase spring, an overvoltage relay, and a power supply. The N-phase current terminal is used to fix the first N-phase conductive plate and the second N-phase conductive plate together. The electromagnetic coil of the overvoltage relay is connected between the first N-phase conductive plate and the second N-phase conductive plate. The first end of the overvoltage relay contact is connected to the positive terminal of the power supply. The second end of the overvoltage relay contact is connected to the first end of the first N-phase electromagnet and the first end of the second N-phase electromagnet. The second ends of the first N-phase electromagnet and the second N-phase electromagnet are connected to the negative terminal of the power supply. The first N-phase spring is connected between the first N-phase electromagnet and the second N-phase electromagnet. The second N-phase spring is connected between the N-phase conductive rod and the N-phase shorting piece. The N-phase conductive rod is connected to the second N-phase conductive plate. The N-phase insulating baffle is connected to the second N-phase electromagnet.

Images