High-voltage core wire isolation device for transformer dielectric loss test

Abstract

The invention provides a high-voltage core wire isolation device for a transformer dielectric loss test. The high-voltage core wire isolation device comprises an adjustable wire fixing clamp, a telescopic supporting rod, a fastening sleeve, a sliding sleeve, triangular supporting legs, an auxiliary supporting frame, a base, a ball head connecting rod joint and a switch magnetic base. Wherein the adjustable wire fixing clamp is made of an ABS (Acrylonitrile Butadiene Styrene) material and has strong insulation and high strength performance, and a handle can be kneaded by two fingers, so that a male lock catch and a female lock catch lock a high-voltage core wire in a clamping cavity in a sawtooth buckling manner, and the high-voltage core wire is prevented from slipping off; unlocking is convenient and fast, the handle can be unlocked by pressing down the female lock catch, and the bottom is glued to the end of the supporting rod in a back glue mode. The device has the advantages that the high-voltage core wire is fixed through the adjustable wire fixing clamp to form effective isolation and is far away from the shell and the sleeve, so that the high-voltage core wire is suspended in the air, and interference of an electric field and the ground is avoided. The device is portable, can be absorbed and fixed on the surface of a housing at different angles and different directions, achieves the purpose of rapid wiring, facilitates on-site installation, reduces test time, and is safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer dielectric loss tests, and specifically to a high-voltage core wire isolation device for transformer dielectric loss tests. Background Art

[0002] Transformer dielectric loss tests can reflect the overall moisture absorption of the transformer, enamel cracking, sludge attached to the windings, and serious local defects, and are an effective means to judge the insulation state of the transformer. When measuring the dielectric loss of the transformer, the bushing is included together. For windings with a working voltage of 10 kV or above, the test voltage is 10 kV. Currently, since the transformer shell is directly grounded, the reverse connection method is usually used for testing the winding dielectric loss factor and capacitance; when wiring, the high-voltage core wire is usually supported by an insulating rod or tied and suspended with insulating tape to prevent the high-voltage core wire from touching the shell, bushing porcelain bottle, and flange, and air insulation is used to avoid the influence of electric field interference and ground conditions. Although this method can complete the test, the process of overlapping the insulating rod or tying the insulating tape takes a long time, and the wiring needs to be adjusted repeatedly. During the test process, the insulating rod often slips, resulting in test failure, seriously affecting the normal progress of the test work. Summary of the Invention

[0003] The purpose of the present invention is to provide an isolation device that is firm, convenient to use, and can reduce the wiring time, which can effectively solve the electric field and ground interference in transformer dielectric loss tests and improve the test efficiency.

[0004] The present invention discloses a high-voltage core wire isolation device for transformer dielectric loss tests, including an adjustable wire clamp, a telescopic support rod, a fastening sleeve, a sliding sleeve, a triangular support leg, an auxiliary support frame, a base, a ball-joint connecting rod, and a switch magnetic base. Among them, the adjustable wire clamp is made of ABS material, with strong insulation and high strength performance. It can pinch the handle with two fingers, and the male lock and the female lock lock the high-voltage core wire in the clamping cavity in a sawtooth buckle manner to prevent the high-voltage core wire from slipping off; it is convenient to unlock, and pressing the handle of the female lock can unlock it. The bottom is glued to the end of the support rod by a back glue method.

[0005] The telescopic support rod is made of fiberglass insulation material to achieve the purpose of insulation. It has a three-section socket telescopic structure, and the support rod is a hollow structure. The sockets are combined and telescoped, and the two fastening sleeves can be screwed tightly to fix the length. When contracted, the minimum length is 50 cm, and when extended, the maximum length is 220 cm. The length can be adjusted according to the transformer test site conditions, and the telescopic use is convenient.

[0006] The triangular support leg is sleeved on the lower section of the support rod through the sliding sleeve. One end of the auxiliary support frame is movably connected to the triangular support leg, and the other end is movably connected to the base of the lower section of the support rod. The combination of the triangular support leg, the auxiliary support frame, and the sliding sleeve can stabilize the support rod and prevent the support rod from tipping over.

[0007] The ends of the triangular support legs are respectively screwed with three ball-joint link joints. The inner spherical surface of the ball-joint link joint is in sliding contact with the outer spherical surface, and it can rotate 360°. The interface is sealed. The ball end has an external thread, and the ball seat end has an internal thread. The triangular support legs are connected to the switch magnetic base through the ball-joint link joints to adapt to the unevenness and unstable isolation on the upper end and side of the transformer.

[0008] The switch magnetic base includes a permanent magnet, a cast iron block, brass, electrotechnical soft iron, and a knob. When the knob is rotated, the N and S poles of the internal permanent magnet are respectively connected to an electrotechnical soft iron. The electrotechnical soft iron is magnetized, and the magnetic lines of force can adsorb external iron through the brass, and the base has magnetism; when released, the knob is rotated, and the N and S poles of the internal permanent magnet are simultaneously connected to the same electrotechnical soft iron, and the magnetic lines of force form a closed loop, and there is no magnetism outside. The upper end of the switch magnetic base is screwed with the ball-joint link joint, and the lower end can have magnetism by rotating the knob and adsorb on the upper end and side of the transformer to achieve a stable effect.

[0009] Advantages of the present invention:

[0010] For the high-voltage core wire isolation device for transformer dielectric loss test of the present invention, when performing the dielectric loss test on the transformer, one end of the telescopic support rod is strongly magnetically adsorbed on the outer shell or side of the transformer through the switch magnetic base, and the other end fixes the high-voltage core wire through an adjustable wire clamp to form an effective isolation, away from the outer shell and bushing, so that the high-voltage core wire is suspended in the air, avoiding electric field and ground interference.

[0011] The high-voltage core wire isolation device for transformer dielectric loss test can be folded and retracted, is portable, and can be adsorbed and fixed on the surface of the outer shell at different angles and in different directions through the ball-joint link joint and the switch magnetic base to achieve the purpose of rapid wiring, facilitate on-site installation, reduce the test duration, and is safe and reliable. Description of the drawings

[0012] Figure 1 It is a schematic structural diagram of the high-voltage core wire isolation device for transformer dielectric loss test.

[0013] Figure 2 It is a schematic structural diagram of the adjustable wire clamp;

[0014] Figure 3 It is a schematic structural diagram of the ball-joint link joint;

[0015] Figure 4 It is a schematic structural diagram of the switch magnetic base;

[0016] Figure 1 In the figure, 1 - adjustable wire clamp, 2 - telescopic support rod, 3 - fastening sleeve, 4 - sliding sleeve, 5 - triangular support leg, 6 - auxiliary support frame, 7 - base, 8 - ball-joint link joint, 9 - switch magnetic base;

[0017] Figure 2 Among them, 1.1 - handle, 1.2 - clamping cavity, 1.3 - adhesive backing base, 1.4 - male lock catch, 1.5 - female lock catch;

[0018] Figure 3 Among them, 8.1 - ball head end, 8.2 - outer spherical surface, 8.3 - inner spherical surface, 8.4 - ball head seat end;

[0019] Figure 4 Among them, 9.1 - brass, 9.2 - permanent magnet, 9.3 - cast iron block, 9.4 - soft electrical iron, 9.5 - knob, 9.6 - iron. Specific embodiments

[0020] Next, the present invention will be further elaborated in detail through embodiments.

[0021] To facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. Typical embodiments of the present invention are shown in the drawings. However, the present invention can be applied to many different scenarios and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that all the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0023] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 simultaneously. The high-voltage core wire isolation device for transformer dielectric loss test includes an adjustable wire clamp 1, a telescopic support rod 2, a fastening sleeve 3, a sliding sleeve 4, a triangular support leg 5, an auxiliary support frame 6, a base 7, a ball head link joint 8, and a switch magnetic base 9.

[0024] The adjustable wire clamp 1 is made of ABS material, has strong insulation and high strength performance, can pinch the handle 1.1 of the two fingers and the handle 1.5 of the female lock catch, so that the male lock catch 1.4 and the female lock catch 1.5 lock the high-voltage core wire in the clamping cavity 1.2 by means of a serrated snap to prevent the high-voltage core wire from slipping off; the unlocking is convenient, and pressing down the handle 1.5 of the female lock catch can unlock it. The adhesive backing base 1.3 is glued to the end of the support rod by means of adhesive.

[0025] The telescopic support rod 2 is made of fiberglass insulation material to achieve the insulation purpose. It has a three-section (upper section, middle section, lower section) socket-type telescopic structure. The support rod has a hollow structure and is telescoped by socket combination. The two fastening sleeves 3 can be screwed tightly to fix the length. When contracted, the minimum length is 50 cm, and when extended, the maximum length is 220 cm. The length can be adjusted according to the situation at the transformer test site, and the telescopic use is convenient.

[0026] The triangular support legs 5 are sleeved on the lower section of the support rod through the sliding sleeves 4. One end of the auxiliary support frame 6 is movably connected to the triangular support legs 5, and the other end is movably connected to the base 7 of the lower section of the support rod. The combination of the triangular support legs 5, the auxiliary support frame 6, and the sliding sleeves 4 can stabilize the support rod and prevent the support rod from tipping over.

[0027] The ends of the triangular support legs are respectively screwed with three ball joint link joints 8. The inner spherical surface 8.3 of the ball joint link joint is in sliding contact with the outer spherical surface 8.2 and can rotate 360°. The interface is sealed. The ball head end 8.1 has an external thread, and the ball head seat end 8.4 has an internal thread. The triangular support legs 5 are connected to the switch magnetic base 9 through the ball joint link joints 8 to adapt to the unevenness and unstable isolation on the upper and side surfaces of the transformer.

[0028] The switch magnetic base 9 includes brass 9.1, permanent magnet 9.2, cast iron block 9.3, soft electrical iron 9.4, and knob 9.5. When the knob 9.5 is rotated, the internal permanent magnet 9.2N and S are respectively connected to a soft electrical iron 9.4. The soft electrical iron 9.4 is magnetized, and the magnetic lines of force can adsorb the external iron 9.6 through the brass 9.1, and the bottom has magnetism. When released, the knob 9.5 is rotated, and the internal permanent magnet 9.2N and S are simultaneously connected to the same soft electrical iron 9.4, and the magnetic lines of force form a closed loop, and there is no magnetism outside. The upper end of the switch magnetic base 9 is screwed to the ball joint link joint 8, and the lower end can be magnetized by rotating the knob and adsorbed on the upper and side surfaces of the transformer to achieve a stable effect.

[0029] The specific use process of this device is as follows:

[0030] 220 kV power supply connection - Pull the power supply panel near the power box, fix the lead wire by tightening the screws, and the leakage protection of the power supply panel operates normally; Equipment wiring - Short-circuit the primary side bushing of the transformer with a short wire, short-circuit and ground the secondary side, and connect the high-voltage core wire to the primary side end; Instrument wiring - Ground the instrument, connect the other end of the high-voltage core wire, and connect the power cord; At this time, the distance between the high-voltage core wire and the equipment shell or bushing is not enough. Open the female lock 1.5 of the adjustable wire clamp 1, put the high-voltage core wire into the clamping cavity 1.2, and pinch the handle 1.1 and the female lock handle 1.5 to clamp it; Spread the triangular support legs 5 and the auxiliary support frame 6, place them at a suitable position on the equipment shell, rotate the knob 9.5 of the switch magnetic base 9. At this time, the bottom of the magnetic base 9 has magnetism and adsorbs the surface of the equipment shell. Adjust the angles of the 3 ball-joint link joints 9 to make the device stably adsorb the surface of the shell; Extend the telescopic support rod 2 and adjust it to an appropriate height so that the high-voltage core wire hangs in the air and keeps a distance from the bushing porcelain bottle, then tighten the fixing sleeve 3 to fix the height; Pressure test - Check that the wiring is correct, apply a pressure of 10 kV, record the data, and turn off the power supply after reducing the pressure; Discharge and clean the site - Wear insulating gloves and use a discharge rod to discharge the equipment, remove the wiring, restore the equipment wiring, and check the site. Throughout the process, there is no need for a support insulating rod or binding insulating tape, avoiding the influence of the electric field and the ground, and greatly saving time costs and improving the test efficiency.

[0031] The high-voltage core wire isolation device for the dielectric loss test of this transformer can be folded and shrunk, is portable, and through the ball-joint link joints and the switch magnetic base, it can adsorb and fix the surface of the shell at different angles and in different directions, achieving the purpose of rapid wiring, facilitating on-site installation, reducing the test duration, and being safe and reliable.

[0032] The above embodiments only represent one implementation mode of the present invention, and its description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the invention patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention shall be subject to the appended claims.

Claims

1. A high-voltage core wire isolation device for transformer dielectric loss test, characterized in that: The high-voltage core wire isolation device for transformer dielectric loss test includes an adjustable wire clamp, a telescopic support rod, a fastening sleeve, a sliding sleeve, a triangular support leg, an auxiliary support frame, a base, a ball-joint connecting rod, and a switch magnetic base; Among them: The adjustable wire clamp is made of ABS material, with strong insulation and high strength. It can pinch the handle with two fingers, so that the male lock and the female lock lock the high-voltage core wire in the clamping cavity by means of a serrated buckle to prevent the high-voltage core wire from slipping off; it is convenient to unlock, just press the handle of the female lock to unlock, and the bottom is glued to the end of the support rod by means of back glue; The telescopic support rod is made of fiberglass insulation material to achieve the purpose of insulation. It has a three-section socket-type telescopic structure, and the support rod is a hollow structure. The socket combination can be telescoped, and the two fastening sleeves can be screwed tightly to fix the length; the minimum retracted length is 50 cm, and the maximum extended length is 220 cm. The length can be adjusted according to the transformer test site conditions, and the telescopic use is convenient.

2. The high-voltage core wire isolation device for transformer dielectric loss test according to claim 1, wherein: The triangular support leg is sleeved on the lower section of the support rod through the sliding sleeve. One end of the auxiliary support frame is movably connected to the triangular support leg, and the other end is movably connected to the base of the lower section of the support rod.

3. The high-voltage core wire isolation device for transformer dielectric loss test according to claim 1, characterized in that: The combination of the triangular support leg, the auxiliary support frame and the sliding sleeve can stabilize the support rod and prevent the support rod from tipping over.

4. The high-voltage core wire isolation device for transformer dielectric loss test according to claim 1, characterized in that: The tail ends of the triangular support legs are respectively screwed with three ball-joint connecting rods. The inner spherical surface and the outer spherical surface of the ball-joint connecting rod are in sliding contact and can rotate 360°. The interface is sealed. The ball end has an external thread, and the ball seat end has an internal thread. The triangular support leg is connected to the switch magnetic base through the ball-joint connecting rod to adapt to the uneven and unstable isolation of the upper and side surfaces of the transformer.

5. The high-voltage core wire isolation device for transformer dielectric loss test according to claim 1, wherein: The switch magnetic base includes a permanent magnet, a cast iron block, brass, electro-soft iron and a knob.

6. The high-voltage core wire isolation device for transformer dielectric loss test according to claim 1, wherein: Rotate the knob. The internal permanent magnet N and S are respectively connected to an electro-soft iron. The electro-soft iron is magnetized, and the magnetic lines of force can adsorb external iron through brass, and the base has magnetism; when released, rotate the knob, and the internal permanent magnet N and S are simultaneously connected to the same electro-soft iron, and the magnetic lines of force form a closed loop and have no magnetism outside.

7. The high-voltage core wire isolation device for transformer dielectric loss test according to claim 1, characterized in that: The upper end of the switch magnetic base is screwed to the ball-joint connecting rod, and the lower end can be magnetized by rotating the knob and adsorbed on the upper and side surfaces of the transformer to achieve a stable effect.

Images