Large motor differential protection mutual inductor wiring device

Abstract

According to the large-scale motor differential protection mutual inductor wiring device provided by the utility model, an anti-reverse connection device is designed at the outer side of the device and is easy to distinguish by naked eyes, and the front and back can be distinguished by hand through touch feeling even if light is poor or an operation position is narrow. When the anti-reverse-connection boss and the groove are abraded, the abrasion can be found in time for maintenance or replacement. The male and female plug insertion locking fixing holes are respectively designed on the male and female plugs and can play a limiting role in the insertion process of the male and female plugs, so that the damage to pins in the male and female plugs or the whole device under the influence of excessive force or accidental external force is prevented; various mounting and fixing functions such as magnetic attraction mounting, guide rail matched clamping groove mounting and screw punching mounting and fixing can be achieved; the matched connecting sheet and the device are combined for use, so that various connection modes such as star-shaped connection, incomplete star-shaped connection and VV connection can be flexibly formed, the use of cables and short-circuit wires can be reduced, the connection is firm and reliable, the failure rate can be reduced, and the efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of turbine units, and particularly relates to a large-scale motor differential protection transformer wiring device. Background Art

[0002] As the power equipment of the turbine unit, large motors are the guarantee for the turbine system to start and output normal power to the process system to work and supply air. Large motors have complex structures, numerous systems, long maintenance and manufacturing cycles, and are expensive. Differential protection, as the main protection of the motor, is an important protection function of the GB / T 14285 Technical Specifications for Relay Protection and Safety Automatic Devices and engineering practice and investment.

[0003] The current transformer is an indispensable device in the differential protection component equipment. The related wiring of the differential protection is related to the normal input of the protection function, the safety of the transformer itself, the safety of personnel and many other aspects. The wiring device of the current transformer in the prior art lacks an anti-reverse connection device, which causes safety hazards. The operation is not convenient enough when connecting with other devices. In addition, the cables and terminal wiring required by the existing wiring device are very complicated, which is not convenient for later fault analysis and maintenance and repair. The maintenance is difficult, time-consuming, and the error rate is high, resulting in low efficiency. Utility Model Content

[0004] The utility model aims to provide a large motor differential protection transformer wiring device to solve the problems of potential safety hazards and low efficiency caused by complex operation of the transformer in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A large motor differential protection transformer wiring device comprises a wiring male connector and a wiring female connector.

[0007] The male connector is provided with multiple rows of pins; the female connector is provided with sockets corresponding to the pins one by one.

[0008] The male terminal and the female terminal are both provided with terminal studs of equal quantity and corresponding positions; the terminal studs of the male terminal correspond to the plug pins one by one.

[0009] The male terminal and the female terminal are provided with anti-reverse insertion protrusions and anti-reverse insertion grooves at corresponding positions on the upper walls thereof, and the anti-reverse insertion protrusions can enter the anti-reverse insertion grooves.

[0010] A first connection block is provided on both side walls of the male terminal; a second connection block is correspondingly provided on both side walls of the female terminal; all the first connection blocks and the second connection blocks are provided with threaded holes that are parallel to and pass through the pins; a connecting bolt matching the threaded hole can penetrate the first connection block and the second connection block at the same time, and fix the male terminal and the female terminal that have been plugged in and connected.

[0011] Connecting plates are provided on both sides of the male and female terminals, and mounting holes of the same specifications are provided on all the connecting plates. The male and female terminals can be fixedly connected to the junction box of the large motor differential protection transformer through the corresponding mounting holes by bolts.

[0012] All the male and female terminals are fixedly connected to the secondary leads of the transformer via terminal studs; all the terminal studs are connected to the secondary leads of the large motor differential protection transformer via short-circuit plates.

[0013] The utility model also has the following features:

[0014] Furthermore, all of the threaded holes are arranged at two-thirds of the corresponding male and female terminals in the vertical direction.

[0015] Furthermore, it also includes a guide rail for installation on a junction box of a large motor differential protection transformer;

[0016] The corresponding positions of the lower walls of the male wiring head and the female wiring head are both provided with guide connection blocks; the guide connection blocks can enter the guide rail and slide along the guide rail.

[0017] Furthermore, a magnetic attraction plate is provided on the lower wall of the male terminal and the female terminal.

[0018] Furthermore, all the short-circuit pieces are provided with wire number and wire color markings.

[0019] Furthermore, the male connector and the female connector are both provided with six rows of terminal studs; the shorting link comprises a first shorting link, a second shorting link and a third shorting link.

[0020] Compared with the prior art, the utility model has the following technical effects:

[0021] (I) In the large motor differential protection transformer wiring device of the utility model, the anti-reverse connection device is designed on the outside of the device, which is easy to distinguish with the naked eye. Even if the light is poor or the operating position is narrow, the positive and negative can be distinguished by touch. While effectively ensuring the safety of use, when the anti-reverse connection boss and groove are worn, it can be discovered in time for repair or replacement.

[0022] At the same time, a first connecting block and a second connecting block are respectively provided on the male connector and the female connector. After the male connector and the female connector are plugged in and connected, the male and female connectors can be fixed to prevent loosening by means of bolt penetration and locking. The first connecting block and the second connecting block are designed at two-thirds of the total length of the vertical dimension of the main line of sight of the male and female connectors. During the plugging process of the male and female connectors, they can play a limiting role, standardize the plugging depth, prevent damage to the internal pins of the male and female connectors or the entire device due to excessive force or the influence of unexpected external force, and further improve safety while ensuring the connection strength.

[0023] In addition, the utility model adopts a short-circuit connection when connecting the terminal studs to the secondary side leads of the large motor differential protection transformer. This setting reduces the difficulty of operation without changing the original wiring form of the transformer and the cable diameter and length, solves the problem of redundant cables and terminal connections, and is conducive to improving work efficiency.

[0024] (II) The large-scale motor differential protection transformer wiring device of the utility model can be directly fixed on the inner wall of a steel junction box / box by magnetic adsorption, especially in situations where there are explosion-proof requirements and holes cannot be opened on the inner wall of the explosion-proof junction box. The use of this device does not destroy the original explosion-proof design and can be installed without damage. In addition, according to conventional usage requirements, a variety of short-circuit pieces are provided, which can be directly plugged into the corresponding terminal studs and locked with terminal screws. It has good matching and reliable fixation, and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view of the connecting male head of the utility model;

[0026] Figure 2 This is a front view of the connecting male head of the utility model;

[0027] Figure 3 It is a top view of the female connector of the utility model;

[0028] Figure 4 This is a front view of the female connector of the utility model;

[0029] Figure 5 It is a schematic diagram of the shorting piece structure of the utility model.

[0030] The meanings of the numbers in the figure are as follows: 1. Male connector; 2. Female connector; 3. Pin; 4. Jack; 5. Terminal stud; 6. Anti-reverse plugging protrusion; 7. Anti-reverse plugging groove; 8. First connecting block; 9. Second connecting block; 10. Threaded hole; 11. Connecting plate; 12. Shorting piece; 13. Guide connecting block;

[0031] 1201, a first shorting link; 1202, a second shorting link; 1203, a third shorting link. DETAILED DESCRIPTION

[0032] It should be noted that, unless otherwise specified, all components of the present invention are components known in the prior art, for example, the shorting piece is a shorting piece made of known commonly used materials.

[0033] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0034] A large motor differential protection transformer wiring device, such as Figures 1 to 4 As shown, the wiring device includes a wiring male connector 1 and a wiring female connector 2 .

[0035] The male connector 1 is provided with multiple rows of pins 3 ; the female connector 2 is provided with sockets 4 corresponding to the multiple rows of pins 3 .

[0036] Both the male terminal 1 and the female terminal 2 are provided with multiple rows of terminal studs 5 of equal quantity and corresponding positions.

[0037] An anti-reverse insertion protrusion 6 and an anti-reverse insertion groove 7 are respectively arranged at corresponding positions on the upper walls of the male connector 1 and the female connector 2 , and the anti-reverse insertion protrusion 6 can enter the anti-reverse insertion groove 7 .

[0038] First connecting blocks 8 are provided on both side walls of the male terminal 1; second connecting blocks 9 are correspondingly provided on both side walls of the female terminal 2; vertically penetrating threaded holes 10 are provided on all the first connecting blocks 8 and the second connecting blocks 9; connecting bolts matching the threaded holes 10 can simultaneously pass through the threaded holes 10 of the first connecting blocks 8 and the second connecting blocks 9 to fix and lock the male terminal 1 and the female terminal 2.

[0039] The male terminal 1 and the female terminal 2 can be fixedly connected to the junction box of the large motor differential protection transformer by means of bolts.

[0040] Connecting plates 11 are provided on both sides of the male terminal 1 and the female terminal 2. All connecting plates 11 are provided with mounting holes of the same specifications. The male terminal 1 and the female terminal 2 can be fixedly connected to the junction box of the large motor differential protection transformer through the corresponding mounting holes by bolts.

[0041] All the terminal studs 5 are connected to the secondary side leads of the large motor differential protection transformer by means of the shorting piece 12. All the male terminals 1 and the female terminals 2 are fixedly connected to the secondary side leads of the transformer by means of the terminal studs 5.

[0042] The anti-reverse insertion protrusion 6 and the anti-reverse insertion groove 7 of the male connector 1 and the female connector 2 are arranged on the outside of the device, and are easily distinguished by naked eyes. Even in poor light or when the operating position is narrow, the front and back sides can be distinguished by touch by hand. When the anti-reverse insertion protrusion 6 and the anti-reverse insertion groove 7 are worn, they can be found in time for repair or replacement.

[0043] As a preferred solution, all threaded holes 10 are arranged at two-thirds of the corresponding male connector 1 and female connector 2 in the vertical direction.

[0044] The threaded hole 10 is designed at two-thirds of the total length of the vertical dimension of the main line of sight of the corresponding male connector 1 and the female connector 2. It can play a limiting role in the process of plugging the male connector 1 and the female connector 2 together, so that the plugging depth is standardized, and the internal pins of the male connector 1 and the female connector 2 or the entire device are prevented from being damaged due to excessive force or accidental external force.

[0045] As a preferred solution, a guide rail is provided on the junction box of the large motor differential protection transformer.

[0046] A guide connection block 13 is provided at the corresponding position of the lower wall of the male terminal 1 and the female terminal 2; the guide connection block 13 can enter the guide rail and slide along the guide rail, and when it slides to the corresponding position, the fixed installation is completed. It is connected to the junction box of the large motor differential protection transformer through the connecting plate 11, which is convenient for operation and further improves work efficiency.

[0047] Furthermore, magnetic plates are provided on the lower walls of the male terminal 1 and the female terminal 2, and the male terminal 1 and the female terminal 2 can be fixedly connected to the junction box of the differential protection transformer of a large motor by means of magnetic attraction.

[0048] As a preferred solution, all shorting pieces 12 are provided with wire number and wire color markings. For the spare and unused windings of the transformer, the shorting piece can be used to directly short-circuit the secondary side, which is more secure and convenient than using ordinary shorting wires to bridge, and reduces the probability of secondary side open circuit. At the same time, the shorting piece can be painted with color or wire number markings to clearly distinguish it from the shorting piece of the winding that has been put into use. The wiring is compact and beautiful in appearance, which is convenient for maintenance and debugging and improves work efficiency.

[0049] As a preferred solution, six rows of terminal studs 5 are provided on both the male connector 1 and the female connector 2 ; the shorting link 12 includes a first shorting link 1101 , a second shorting link 1102 and a third shorting link 1103 .

[0050] Specifically, when the wiring device of the secondary side of the current transformer adopts the star connection method, the first short-circuit bar 1101 can be used to short-circuit the secondary sides of the three sets of transformer protection windings on the motor side using the short-circuit bar 11, and the three ABCs are combined to form a star point, and a wire is used to lead out as a neutral line.

[0051] When the wiring device of the secondary side of the current transformer adopts an incomplete star connection, the second shorting link 1102 and the third shorting link 1103 can be used.

[0052] When the wiring device of the secondary side of the current transformer adopts the VV transformer connection method, the second shorting link 1102 and the third shorting link 1103 can be used.

[0053] For the unused windings of the mutual inductor, the first shorting link 1101, the second shorting link 1102 and the third shorting link 1103 can be used to short-circuit and close the secondary side of the three phases.

[0054] According to the above connection method corresponding to different shorting pieces, the operation can be simplified, the wire material for connecting two protection devices on the opposite side can be saved, and the probability of open circuit and wiring error caused by too many connections can be reduced, thereby improving work efficiency.

[0055] During maintenance, just loosen the fixing nut and directly unplug the male and female heads of the device to disconnect the line connection. There is no need to change the original markings when unplugging the male and female heads. After the maintenance is completed, just plug the corresponding one in to restore it. It also has an anti-reverse connection function, which will not cause reverse insertion. The wiring sequence and points before maintenance can be completely restored, eliminating the false operation and refusal of differential protection caused by reverse line connection. It is safe and convenient.

[0056] According to the estimation of 3 sets of 3-phase 3-winding current transformers (with protection, measurement and metering windings) supporting a 10KV large synchronous motor. During the debugging including preventive test, at least 18 leads need to be drawn from the secondary side of the transformer. Two skilled workers divide the 18 wires into windings, identify and confirm the same-name terminal marks and connect and fix them, and then debug with the protection device side, which takes about 2 hours. (Not including the time for disassembly and restoration of the transformer side junction box cover) Using this wiring device, loosening the fixed wiring device and unplugging the male and female heads generally takes no more than 15 minutes, which greatly improves efficiency. And the operation is simple, and the general basic technical operators can complete the operation, and the requirements for operators are not high.

Claims

1. A large motor differential protection transformer wiring device, characterized in that: The wiring device comprises a wiring male connector (1) and a wiring female connector (2); The male connector (1) is provided with a plurality of rows of plug pins (3) inside; the female connector (2) is provided with plug holes (4) corresponding to the plug pins (3) one by one; The male terminal (1) and the female terminal (2) are both provided with an equal number of terminal studs (5) at corresponding positions; the terminal studs (5) of the male terminal (1) correspond one to one with the plug pins (3); An anti-reverse insertion protrusion (6) and an anti-reverse insertion groove (7) are respectively arranged at corresponding positions on the upper walls of the male terminal (1) and the female terminal (2), and the anti-reverse insertion protrusion (6) can enter the interior of the anti-reverse insertion groove (7); The male connector (1) is provided with a first connection block (8) on both side walls; the female connector (2) is provided with a second connection block (9) on both side walls; all the first connection blocks (8) and the second connection blocks (9) are provided with a threaded hole (10) which is parallel to and passes through the plug pin (3); a connecting bolt matching the threaded hole (10) can simultaneously pass through the first connection block (8) and the second connection block (9) to fix the male connector (1) and the female connector (2) which have been plugged in and connected; Both sides of the male terminal (1) and the female terminal (2) are provided with connecting plates (11), and all the connecting plates (11) are provided with mounting holes of the same specification, and the male terminal (1) and the female terminal (2) can be fixedly connected to the junction box of the large motor differential protection transformer through the corresponding mounting holes by means of bolts; All the male terminals (1) and female terminals (2) are fixedly connected to the secondary leads of the transformer via terminal studs (5); all the terminal studs (5) are connected to the secondary leads of the large motor differential protection transformer via short-circuit pieces (12).

2. The large motor differential protection transformer wiring device according to claim 1, characterized in that: All of the threaded holes (10) are arranged at two-thirds of the vertical direction of the corresponding male terminal (1) and female terminal (2).

3. The large motor differential protection transformer wiring device according to claim 2, characterized in that: Also included are rails for mounting on the junction box of large motor differential protection transformers; A guide connection block (13) is provided at corresponding positions on the lower walls of the male wiring connector (1) and the female wiring connector (2); the guide connection block (13) can enter the guide rail and slide along the guide rail.

4. The large motor differential protection transformer wiring device according to claim 1, characterized in that: The lower walls of the male terminal (1) and the female terminal (2) are provided with magnetic attraction plates.

5. The large motor differential protection transformer wiring device according to claim 4, characterized in that: All the short-circuit pieces (12) are provided with wire number and wire color markings.

6. The large motor differential protection transformer wiring device according to claim 5, characterized in that: The male terminal (1) and the female terminal (2) are both provided with six rows of terminal studs (5); The shorting link (12) comprises a first shorting link (1101), a second shorting link (1102) and a third shorting link (1103).

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