Power transformer automatic detection branching clamp with short circuit function

Abstract

The utility model provides a power transformer automatic detection branching clamp with a short circuit function, which comprises a U-shaped metal plate, a twelve-core aviation socket, a current insulating plate, a current copper block, a puller screw, a screw wrench and a current insulating sleeve, and a protective end cover is arranged outside the current copper block, the current insulating plate, the current insulating sleeve and a fixed screw. The protection end cover is provided with a plurality of cross pan heads for fixing the device, the other side of the protection end cover is provided with a short screw wrench, the middle of the short screw wrench is connected through a locking screw, and the twelve-core aviation socket and the four-core aviation sockets are fixed in an inner cavity in one end of the U-shaped metal plate through an aluminum cover plate, bolts and nuts. The four-core aviation socket can be more compact, twelve core wires of three four-core aviation sockets are all short-circuited, and the current copper block, the current insulating plate and the current insulating sleeve also provide safety guarantee for large and small current switching.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment measurement, in particular to an automatic detection branching fixture for power transformers with a short-circuiting function. Background Art

[0002] Power transformer factory testing, power outage testing, and preventive testing. Some test items require high voltage or large current, while other test items can be performed at low voltage or small current. Therefore, it is necessary to achieve safe switching between high and low voltages and large and small currents during automated testing of power transformers.

[0003] The existing devices have the following problems:

[0004] 1. Comparative document CN105301298B discloses a wire splitter for automatic detection of power transformers, and the protected claim is: "The present invention discloses a wire splitter for automatic detection of power transformers, comprising three three-wire aviation sockets, a twelve-wire aviation socket, a current insulating plate, a current copper block and a U-shaped metal plate; the three three-wire aviation sockets and the twelve-wire aviation socket are fixed on the U-shaped metal plate through an aluminum cover plate and bolts and nuts; the twelve wires on the twelve-wire aviation socket are respectively connected to the three three-wire aviation sockets, the U-shaped metal plate and the screw wrench, the tightening nut, the tightening screw, the voltage stud and the current copper block; the current copper block is connected through Two fixing screws are fixed on the U-shaped metal plate, a current insulating plate is provided between the current copper block and the U-shaped metal plate, and a current insulating sleeve is provided on the fixing screw; one end of the tightening screw passes through the U-shaped metal plate, a screw wrench is provided on the other end of the tightening screw, and a tightening nut is provided on the top of one end of the tightening screw; the installation and operation of the present invention is convenient and simple, and the adaptability is strong, which greatly improves the efficiency of the test personnel's wiring and other operations. "However, this device does not have a short-circuit function when in use. When measuring the short-circuit impedance of the power transformer, it is necessary to frequently shut down the power during the test, and the personnel climb the transformer many times to short-circuit the bushings to achieve short-circuiting of each branch bushing (4 or less). Faced with the problems of large current carrying capacity of the test line, many types and quantities of test lines, cumbersome wiring operations, and potential safety hazards.

[0005] Therefore, there is an urgent need for an automatic detection and branching fixture for power transformers with a short-circuiting function to solve the above problems. Summary of the invention

[0006] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a power transformer automatic detection branching fixture with a short-circuiting function to solve the problems raised in the background technology.

[0007] The utility model is to solve the above technical problems, and the technical scheme adopted is: an automatic detection branching fixture for power transformers with short-circuiting function, comprising a U-shaped metal plate, a twelve-core aviation socket, a current insulating plate, a current copper block, a tightening screw, a screw wrench and a current insulating sleeve, one end of the tightening screw passes through the U-shaped metal plate, the other end of the tightening screw is provided with a screw wrench, the top of one end of the tightening screw is provided with a tightening nut, the sleeve of the power transformer can be clamped between the tightening nut and the current copper block by rotating the screw wrench, the current copper block is fixed on the U-shaped metal plate by two fixing screws, a current insulating plate is provided between the current copper block and the U-shaped metal plate, and a current insulating sleeve is provided on the fixing screw;

[0008] The outside of the current copper block, the current insulating plate, the current insulating sleeve and the fixing screw is provided with a protective end cover, and a plurality of cross pan heads are provided on the protective end cover to fix the device. A short screw wrench is provided on the other side of the protective end cover, and the middle of the short screw wrench is connected by a locking screw. The twelve-core aviation socket and a plurality of four-core aviation sockets are fixed in the inner cavity at one end of the U-shaped metal plate through an aluminum cover plate and bolts and nuts.

[0009] Preferably, the four-core aviation socket is provided with a voltage wire, a shielding wire and two current wires.

[0010] Preferably, the first shielding wire, the first voltage wire and the first current wire of the twelve-core aviation socket are respectively connected to the shielding wire, the voltage wire and the current wire inside the first four-core aviation socket through the conductive medium inside the U-shaped metal plate, the second shielding wire, the second voltage wire and the second current wire of the twelve-core aviation socket are respectively connected to the four leads inside the second four-core aviation socket through the conductive medium inside the U-shaped metal plate, and the third shielding wire, the third voltage wire and the third current wire of the twelve-core aviation socket are respectively connected to the four leads inside the third four-core aviation socket through the conductive medium inside the U-shaped metal plate.

[0011] Preferably, the fourth shielding wire of the twelve-core aviation socket is connected to the screw hole on the back side of the U-shaped metal plate.

[0012] Preferably, the fourth voltage line of the twelve-core aviation socket is connected to the U-shaped metal plate, the current copper block, the screw wrench, the tightening nut, the tightening screw and the voltage stud.

[0013] Preferably, the voltage stud is connected to the high-voltage shielding stud.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model is simple and convenient to install and operate, and can realize the short circuit of each branch bushing (4 or less), and has the short-circuit impedance test function, which reduces the test wires, reduces the time of removing and connecting the test wires, reduces the number of times personnel climb the transformer, improves the safety of the test, and improves the test efficiency;

[0016] 2. The utility model does not change the size structure of the aviation plug interface, but adds a current line design inside to enable safe switching of high and low voltages and large and small currents in the branching fixture, ensuring that the device can flow 100A of current, greatly enhancing the current carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 3 It is a schematic diagram of the internal structure of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] See also Figures 1 to 3 , an automatic detection and branching fixture for power transformers with a short-circuit function, comprising a U-shaped metal plate 1, a twelve-core aviation socket 2, a current insulating plate 3, a current copper block 4, a tightening screw 5, a screw wrench 6 and a current insulating sleeve 7, one end of the tightening screw 5 passes through the U-shaped metal plate 1, the other end of the tightening screw 5 is provided with a screw wrench 6, the top of one end of the tightening screw 5 is provided with a tightening nut 8, the sleeve of the power transformer can be clamped between the tightening nut 8 and the current copper block 4 by rotating the screw wrench 6, the current copper block 4 is fixed on the U-shaped metal plate 1 by two fixing screws 9, a current insulating plate 3 is provided between the current copper block 4 and the U-shaped metal plate 1, and a current insulating sleeve 7 is provided on the fixing screw 9;

[0022] A protective end cover 15 is provided on the outside of the current copper block 4, the current insulating plate 3, the current insulating sleeve 7 and the fixing screw 9. A plurality of cross pan heads 11 are provided on the protective end cover 15 to fix the device. A short screw wrench 12 is provided on the other side of the protective end cover 15. The middle of the short screw wrench 12 is connected by a locking screw 17. The twelve-core aviation socket 2 and the plurality of four-core aviation sockets 10 are fixed in the inner cavity at one end of the U-shaped metal plate 1 through an aluminum cover plate 16 and bolts and nuts.

[0023] Preferably, the four-core aviation socket 10 is provided with a voltage line, a shielding line and two current lines. This design adds a current line to the aviation socket, and the fourth current line is used for the safe switching of high and low voltages, large and small currents, so that the device can withstand high voltage and large currents. Without changing the size structure of the aviation plug interface, the design of adding current lines inside enables the safe switching of high and low voltages, large and small currents of the branching fixture, ensuring that the device can flow 100A of current, greatly enhancing the flow capacity.

[0024] Preferably, the first shielding wire, the first voltage wire, and the first current wire of the twelve-core aviation socket 2 are respectively connected to the shielding wire, the voltage wire, and the current wire inside the first four-core aviation socket 10.1 through the conductive medium inside the U-shaped metal plate 1, the second shielding wire, the second voltage wire, and the second current wire of the twelve-core aviation socket 2 are respectively connected to the four leads inside the second four-core aviation socket 10.2 through the conductive medium inside the U-shaped metal plate 1, and the third shielding wire, the third voltage wire, and the third current wire of the twelve-core aviation socket 2 are respectively connected to the four leads inside the third four-core aviation socket 10.3 through the conductive medium inside the U-shaped metal plate 1. This structural design is convenient for operation and also more convenient for maintenance of the device.

[0025] Preferably, the fourth shielding wire of the twelve-core aviation socket 2 is connected to the screw hole 1.1 on the back side of the U-shaped metal plate 1.

[0026] Preferably, the fourth voltage line of the twelve-core aviation socket 2 is connected to the U-shaped metal plate 1 , the current copper block 4 , the screw wrench 6 , the tightening nut 8 , the tightening screw 5 and the voltage stud 13 .

[0027] Preferably, the voltage stud 13 is connected to the high voltage shielding stud 14. This is mainly to facilitate the extraction of the ground wire to shield external signals when conducting dielectric loss and other testing projects.

[0028] The working principle of this embodiment is as follows:

[0029] When the utility model is in use, the wire splitter can be fixed on the A-phase winding of the transformer by shaking the screw handle, and then the corresponding four-core cable can be split from the A-phase converter to the B-phase, C-phase and neutral point. When a direct resistance test is performed, a 10A low current and a low voltage can be passed; when a short resistance test is performed, the short screw wrench is rotated to short-circuit all the twelve cores of the three four-core aviation sockets, and a 50-70A short-circuit current and a low voltage can be passed; when a dielectric loss test is performed, a 10000V AC high voltage can be passed; when an insulation resistance test is performed, a 5000V DC high voltage can be passed.

[0030] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An automatic detection and branching fixture for power transformers with a short-circuiting function, comprising a U-shaped metal plate (1), a twelve-core aviation socket (2), a current insulating plate (3), a current copper block (4), a tightening screw (5), a screw wrench (6) and a current insulating sleeve (7), wherein one end of the tightening screw (5) passes through the U-shaped metal plate (1), the other end of the tightening screw (5) is provided with a screw wrench (6), a tightening nut (8) is provided at the top of one end of the tightening screw (5), the sleeve of the power transformer can be clamped between the tightening nut (8) and the current copper block (4) by rotating the screw wrench (6), the current copper block (4) is fixed to the U-shaped metal plate (1) by two fixing screws (9), a current insulating plate (3) is provided between the current copper block (4) and the U-shaped metal plate (1), and the fixing screw (9) is provided with a current insulating sleeve (7); characterized in that: The current copper block (4), the current insulating plate (3), the current insulating sleeve (7) and the fixing screw (9) are provided with a protective end cover (15) on the outside, and a plurality of cross pan heads (16) are provided on the protective end cover (15) to fix the device. A short screw wrench (12) is provided on the other side of the protective end cover (15), and the middle of the short screw wrench (12) is connected by a locking screw (17). The twelve-core aviation socket (2) and the plurality of four-core aviation sockets (10) are fixed in the inner cavity of one end of the U-shaped metal plate (1) through an aluminum cover plate (11) and bolts and nuts.

2. According to claim 1, the automatic detection and branching fixture for power transformers with short-circuiting function is characterized in that: The four-core aviation socket (10) is provided with a voltage line, a shielding line and two current lines.

3. The automatic detection and branching fixture for power transformers with short-circuiting function according to claim 1 is characterized in that: The first shielding wire, the first voltage wire, and the first current wire of the twelve-core aviation socket (2) are respectively connected to the shielding wire, the voltage wire, and the current wire inside the first four-core aviation socket (10.1) through the conductive medium inside the U-shaped metal plate (1); the second shielding wire, the second voltage wire, and the second current wire of the twelve-core aviation socket (2) are respectively connected to the four lead wires inside the second four-core aviation socket (10.2) through the conductive medium inside the U-shaped metal plate (1); and the third shielding wire, the third voltage wire, and the third current wire of the twelve-core aviation socket (2) are respectively connected to the four lead wires inside the third four-core aviation socket (10.3) through the conductive medium inside the U-shaped metal plate (1).

4. The automatic detection and branching fixture for power transformers with short-circuiting function according to claim 1 is characterized in that: The fourth shielding wire of the twelve-core aviation socket (2) is in communication with the screw hole (1.1) on the back side of the U-shaped metal plate (1).

5. The automatic detection and branching fixture for power transformers with short-circuiting function according to claim 1 is characterized in that: The fourth voltage line of the twelve-core aviation socket (2) is connected to the U-shaped metal plate (1), the current copper block (4), the screw wrench (6), the tightening nut (8), the tightening screw (5) and the voltage stud (13).

6. The automatic detection and branching fixture for power transformers with short-circuiting function according to claim 5 is characterized in that: The voltage stud (13) is in communication with the high-voltage shielding stud (14).

Images