CN209946348U

CN209946348U - Portable CT return circuit detection device that opens a way

Info

Publication number: CN209946348U
Application number: CN201920370919.8U
Authority: CN
Inventors: 吴琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-01-14
Anticipated expiration: 2029-03-22

Abstract

The utility model provides a portable CT return circuit detection device that opens a way. The portable CT circuit open circuit detection device comprises: a resistance tester body; the stretching mechanism, stretching mechanism set up in the surface of resistance tester body, stretching mechanism includes two fixed frames, two sliding blocks, two stretching rods and arm-tie, two the back of fixed frame is fixed in respectively the both sides on the surface of resistance tester body. The utility model provides a portable CT return circuit detection device that opens a way, the universal wheel shifts out to the outside of casing, make the universal wheel ground connection, so that remove the resistance tester body, press the kelly, make the kelly keep away from the draw-in groove of fixed frame both sides bottom, the pulling arm drives tensile pole and removes, make tensile pole stretch out to fixed frame outside, the user can hold the pulling arm and stimulate the resistance tester body, the convenience is carried the resistance tester body, user's work load has been reduced, the practicality of device has been improved.

Description

Portable CT return circuit detection device that opens a way

Technical Field

The utility model relates to a CT return circuit detection area especially relates to a portable CT return circuit detection device that opens a way.

Background

The open circuit of the secondary circuit of the current transformer is a problem of artificial equipment strictly forbidden to occur in an electric power system, and not only can cause great influence on protection, control and measurement circuits in the electric secondary circuit, but also can generate high voltage in the secondary circuit to seriously endanger personal and equipment safety, so that a secondary terminal is burnt out if the secondary terminal is light, and a CT iron core is saturated and overheated to damage primary equipment if the primary equipment is seriously damaged, so that the open circuit of the secondary circuit of the current transformer is a technical problem that the field work of the electric secondary equipment of the electric power system needs to be paid attention constantly, and the open circuit of the secondary circuit of: loosening the secondary loop terminal of the current transformer after long-term operation; and the wiring of the secondary circuit of the current transformer which changes during the maintenance test is wrongly wired when the measures are recovered, and the like.

At present, a CT loop is not allowed to be disconnected in the normal operation process, the existing detection method needs to detect direct resistance by using a universal meter after the loop is disconnected at a terminal row, the loop is recovered after detection is finished, and virtual connection or wrong connection and other conditions can be caused in the final recovery process, so that the CT open circuit is caused.

Therefore, it is necessary to provide a portable CT circuit open circuit detection device to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a portable CT return circuit detection device that opens a way has solved present CT return circuit detection device that opens a way, the inconvenient problem of carrying.

In order to solve the above technical problem, the utility model provides a portable CT return circuit detection device that opens a way includes: a resistance tester body; the stretching mechanism is arranged on the surface of the resistance tester body and comprises two fixing frames, two sliding blocks, two stretching rods and a pulling plate, the back surfaces of the two fixing frames are respectively fixed on two sides of the surface of the resistance tester body, two sides of the two sliding blocks respectively slide on two sides of the inner wall of the two fixing frames, the bottom ends of the two stretching rods are respectively fixed on the top parts of the two sliding blocks, the top ends of the two stretching rods penetrate through the fixing frames and extend to the outside of the fixing frames, and two sides of the bottom of the pulling plate are respectively fixed on the top ends of the two stretching rods; the tops of the two clamping mechanisms are respectively fixed at the bottoms of the two sliding blocks; the right side of the buffer mechanism is fixed on the left side of the resistance tester body; the top of the moving mechanism is fixed at the bottom of the resistance tester body; the left side of the handle is arranged on the right side of the resistance tester body.

Preferably, the clamping mechanism comprises a clamping frame, a stabilizing block, two moving blocks, two clamping rods, two first springs and a clamping groove, the top of the clamping frame is fixed to the bottom of the sliding block, two sides of the top of the two moving blocks slide on two sides of the top of the inner wall of the clamping frame respectively, one ends of the two clamping rods are fixed to one side, away from each other, of the two moving blocks respectively, and the other ends of the two clamping rods penetrate through the clamping frame and the fixed frame respectively and extend to the outside of the fixed frame.

Preferably, the two first springs are respectively arranged between two sides of the stabilizing block and one side of the two moving blocks opposite to each other, and the clamping groove is formed in the fixing frame.

Preferably, buffer gear is including buffering frame, two telescopic links, buffer board, two first turning blocks, two connecting rods, two second turning blocks and second spring, one side of buffering frame is fixed in one side of resistance tester body, two the one end of telescopic link is fixed in respectively the top and the bottom of one side of the inner wall of buffering frame, two the other end of telescopic link all runs through the buffering frame just extends to the outside of buffering frame, the top and the bottom of one side of buffer board are fixed in two respectively the one end of telescopic link.

Preferably, two one side of first turning block is fixed in respectively the top and the bottom of one side of buffer board, two the one end of connecting rod rotates respectively in two one side of first turning block, two the other end of connecting rod all runs through the buffering frame just extends to the inside of buffering frame, two one side of second turning block slide respectively in the top and the bottom of one side of the inner wall of buffering frame, two the opposite side of second turning block respectively with two the one end of connecting rod is rotated and is connected, the second spring set up in two between the relative one side of second turning block.

Preferably, the moving mechanism comprises a shell, a moving plate, two universal wheels, a screw rod, two thread blocks, two transmission rods, two moving blocks, a moving groove and a rotating handle, the top of the shell is fixed at the bottom of the resistance tester body, two sides of the moving plate respectively slide on two sides of the inner wall of the shell, the tops of the two universal wheels are respectively fixed at two sides of the bottom of the moving plate, and the bottoms of the universal wheels penetrate through the shell and extend to the outside of the shell.

Preferably, one end of the lead screw rotates to the top of one side of the inner wall of the shell, the other end of the lead screw penetrates through the shell and extends to the outside of the shell, one side of the rotating handle is fixed to one end, located at the outside of the shell, of the lead screw, the insides of the two thread blocks are respectively threaded to two sides of the surface of the lead screw, the tops of the two thread blocks are respectively connected with the top of the inner wall of the shell in a sliding mode, one ends of the two transmission rods respectively rotate to the surfaces of the two thread blocks, the bottoms of the two moving blocks are respectively fixed to two sides of the top of the moving plate, the tops of the two moving blocks are respectively connected with one ends of the two transmission rods in a rotating mode, and the moving groove is formed in the bottom of.

Compared with the prior art, the utility model provides a portable CT return circuit detection device that opens a way has following beneficial effect:

the utility model provides a portable CT loop open circuit detection device, which rotates a lead screw through a rotating handle, the lead screw drives two screw blocks to move, the screw blocks drive a transmission rod to move, the transmission rod drives a moving block to move, a moving block drives a moving plate to move, the moving plate drives a universal wheel to move, the universal wheel is moved out to the outside of a shell, the universal wheel is grounded, so as to move a resistance tester body, a clamping rod is pressed to be away from a clamping groove at the bottom of two sides of a fixed frame, a pulling plate is pulled, the pulling plate drives a stretching rod to move, the stretching rod extends out of the fixed frame, a user can hold the pulling plate to pull the resistance tester body, the resistance tester body is conveniently carried, the workload of the user is reduced, the practicability of the device is improved, a second rotating block is extruded through the elasticity of a second spring, the second rotating block extrudes a connecting rod, the connecting rod extrudes, first turning block extrusion buffer board can provide certain buffering protection for the resistance tester body through the buffer board, avoids the resistance tester body from user's hand landing, drops on ground and causes the condition of damage.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of a portable CT loop open circuit detection apparatus provided by the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic structural view of the chucking mechanism shown in FIG. 1;

FIG. 4 is a schematic structural view of the moving mechanism shown in FIG. 1;

FIG. 5 is a schematic view of a prior art detection mechanism;

fig. 6 is a prior art test schematic.

Reference numbers in the figures: 1. the resistance tester comprises a resistance tester body, 2, a stretching mechanism, 21, a fixed frame, 22, a sliding block, 23, a stretching rod, 24, a pulling plate, 3, a clamping mechanism, 31, a clamping frame, 32, a stable block, 33, a moving block, 34, a clamping rod, 35, a first spring, 36, a clamping groove, 4, a buffer mechanism, 41, a buffer frame, 42, a telescopic rod, 43, a buffer plate, 44, a first rotating block, 45, a connecting rod, 46, a second rotating block, 47, a second spring, 5, a moving mechanism, 51, a shell, 52, a moving plate, 53, a universal wheel, 54, a screw rod, 55, a thread block, 56, a transmission rod, 57, a moving block, 58, a moving groove, 59, a rotating handle, 6 and a handle.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6 in combination, in which fig. 1 is a schematic structural diagram of a preferred embodiment of a portable CT loop open circuit detection apparatus provided by the present invention; FIG. 2 is an enlarged view of portion A of FIG. 1; FIG. 3 is a schematic structural view of the chucking mechanism shown in FIG. 1; FIG. 4 is a schematic structural view of the moving mechanism shown in FIG. 1; FIG. 5 is a schematic view of a prior art detection mechanism; fig. 6 is a prior art test schematic. The portable CT circuit open circuit detection device comprises: a resistance tester body 1; the stretching mechanism 2, the stretching mechanism 2 set up in the surface of resistance tester body 1, the stretching mechanism 2 includes two fixed frames 21, two sliding blocks 22, two stretching rods 23 and arm-tie 24, two the back of fixed frame 21 is fixed in respectively the both sides on resistance tester body 1's surface, two the both sides of sliding block 22 slide respectively in two the both sides of the inner wall of fixed frame 21, the both sides of the inner wall of fixed frame 21 all set up the spout that uses with sliding block 22 cooperation, two the bottom of stretching rod 23 is fixed in respectively two the top of sliding block 22, two the top of stretching rod 23 runs through fixed frame 21 and extends to the outside of fixed frame 21, the both sides of the bottom of arm-tie 24 are fixed in respectively two the top of stretching rod 23, an arc type groove has been seted up to the bottom of arm-tie 24, to facilitate the user's grip on the pulling plate 24; the tops of the two clamping mechanisms 3 are respectively fixed at the bottoms of the two sliding blocks 22; the right side of the buffer mechanism 4 is fixed on the left side of the resistance tester body 1; the top of the moving mechanism 5 is fixed at the bottom of the resistance tester body 1; and the left side of the handle 6 is arranged on the right side of the resistance tester body 1.

The clamping mechanism 3 comprises a clamping frame 31, a stabilizing block 32, two moving blocks 33, two clamping rods 34, two first springs 35 and a clamping groove 36, the top of the clamping frame 31 is fixed to the bottom of the sliding block 22, two sides of the top of the two moving blocks 33 slide on two sides of the top of the inner wall of the clamping frame 31 respectively, one end of each of the two clamping rods 34 is fixed to one side, away from the other side of the two moving blocks 33, of the two clamping rods 34 respectively penetrates through the clamping frame 31 and the fixed frame 21 and extends to the outside of the fixed frame 21.

The two first springs 35 are respectively disposed between two sides of the stable block 32 and one side of the two moving blocks 33 opposite to each other, the four locking grooves 36 are disposed on the fixed frame 21, and the four locking grooves 36 are respectively disposed at the top and the bottom of two sides of the fixed frame 21.

Buffer gear 4 is including buffering frame 41, two telescopic links 42, buffer board 43, two first turning block 44, two connecting rods 45, two second turning block 46 and second spring 47, one side of buffering frame 41 is fixed in one side of resistance tester body 1, two the one end of telescopic link 42 is fixed in respectively the top and the bottom of one side of the inner wall of buffering frame 41, two the other end of telescopic link 42 all runs through buffering frame 41 and extend to the outside of buffering frame 41, the top and the bottom of one side of buffer board 43 are fixed in two respectively the one end of telescopic link 42, telescopic link 42 are used for supporting buffer board 43, improve the stability when buffer board 43 uses.

Two one side of first turning block 44 is fixed in respectively the top and the bottom of one side of buffer board 43, two the one end of connecting rod 45 rotates respectively in two one side of first turning block 44, two the other end of connecting rod 45 all runs through buffering frame 41 and extend to the inside of buffering frame 41, two one side of second turning block 46 slide respectively in the top and the bottom of one side of the inner wall of buffering frame 41, two the opposite side of second turning block 46 respectively with two the one end of connecting rod 45 is rotated and is connected, second spring 47 set up in two between the relative one side of second turning block 46.

The moving mechanism 5 comprises a shell 51, a moving plate 52, two universal wheels 53, a screw 54, two thread blocks 55, two transmission rods 56, two moving blocks 57, a moving groove 58 and a rotating handle 59, wherein the top of the shell 51 is fixed at the bottom of the resistance tester body 1, two sides of the moving plate 52 respectively slide on two sides of the inner wall of the shell 51, the tops of the two universal wheels 53 are respectively fixed at two sides of the bottom of the moving plate 52, and the bottoms of the universal wheels 53 penetrate through the shell 51 and extend to the outside of the shell 51.

One end of the screw rod 54 rotates at the top of one side of the inner wall of the shell 51, two sides of the surface of the screw rod 54 are provided with threads in opposite directions, the other end of the screw rod 54 penetrates through the shell 51 and extends to the outside of the shell 51, one side of the rotating handle 59 is fixed at one end of the screw rod 54 located at the outside of the shell 51, the insides of the two thread blocks 55 are respectively threaded at two sides of the surface of the screw rod 54, the tops of the two thread blocks 55 are respectively connected with the top of the inner wall of the shell 51 in a sliding manner, one ends of the two transmission rods 56 are respectively rotated at the surfaces of the two thread blocks 55, the bottoms of the two moving blocks 57 are respectively fixed at two sides of the top of the moving plate 52, the tops of the two moving blocks 57 are respectively connected with one ends of the two transmission rods 56 in a rotating manner, and the moving groove 58, the moving groove 58 is used to move the universal wheel 53 to the outside of the housing 51.

The detection mechanism in the prior art comprises a resistance tester and a lead, wherein the lead short-circuits a terminal of a secondary loop on a CT body of a current transformer, the resistance tester is clamped on the lead or other parts of a loop where the lead is located, the resistance tester is a pincerlike resistance tester, the length of the lead is 20-30 cm, as shown in fig. 6, r0+ jX- - -CT winding reactance, r1+ jX1, r2+ jX2- -represent equivalent impedance of a sampling element of a device for secondary measurement, protection and the like, a jaw part of the pincerlike resistance tester consists of a voltage coil and a current coil, the voltage coil provides an excitation signal and induces a potential E on a measured loop, a current I is generated in the measured loop under the action of the potential E, the E and the I are measured, the impedance of the measured loop is obtained through calculation, and because the inductive reactance component in the CT impedance is large, when in measurement, a wire is used as a short-circuit wire to short-circuit a secondary circuit wiring terminal on the CT body, the wire is manually connected (no wire disassembly is needed), then the pincerlike resistance tester is clamped on the short-circuit wire or other parts of the circuit to measure, and because the impedance of sampling elements of devices such as measurement and protection in the secondary circuit of the current transformer is small, the measurement cannot be influenced, and therefore whether the secondary circuit of the current transformer is open-circuited or not can be judged through the indication value on the resistance tester, the operation is simple and convenient, and the detection can be carried out without professional personnel.

The utility model provides a portable CT return circuit detection device that opens a way's theory of operation as follows:

the first step is as follows: the screw rod 54 is rotated through the rotating handle 59, the screw rod 54 drives the two thread blocks 55 to move, the thread blocks 55 drive the transmission rod 56 to move, the transmission rod 56 drives the moving block 57 to move, the moving block 57 drives the moving plate 52 to move, the moving plate 52 drives the universal wheels 53 to move, the universal wheels 53 are moved out of the shell 51, and the universal wheels 53 are grounded;

the second step is that: pressing the clamping rod 34 to enable the clamping rod 34 to be far away from the clamping grooves 36 at the bottoms of the two sides of the fixed frame 21, pulling the pulling plate 24, enabling the pulling plate 24 to drive the stretching rod 23 to move, enabling the stretching rod 23 to extend out of the fixed frame 21 until one end of the clamping rod 34 is inserted into the clamping grooves 36 at the tops of the two sides of the fixed frame 21, extruding the moving block 33 through the elastic force of the first spring 35, extruding the clamping rod 34 through the moving block 33, enabling the clamping rod 34 to be kept stable, and therefore the stability of the stretching rod 23 in use is guaranteed, and a user can hold the pulling plate 24 to pull the resistance tester;

the third step: the resistance tester body 1 is taken up to user's accessible handle 6, elasticity through second spring 47 extrudees second turning block 46, second turning block 46 extrudees connecting rod 45, connecting rod 45 extrudes first turning block 44, first turning block 44 extrudees buffer board 43, can provide certain buffer protection for resistance tester body 1 through buffer board 43, avoid resistance tester body 1 from the landing of user's hand, drop on ground and cause the condition of damage.

the lead screw 54 is rotated by the rotating handle 59, the lead screw 54 drives the two thread blocks 55 to move, the thread blocks 55 drive the transmission rod 56 to move, the transmission rod 56 drives the moving block 57 to move, the moving block 57 drives the moving plate 52 to move, the moving plate 52 drives the universal wheel 53 to move, the universal wheel 53 is moved out of the shell 51 to be grounded, so that the resistance tester body 1 is moved, the clamping rod 34 is pressed, the clamping rod 34 is far away from the clamping grooves 36 at the bottoms of the two sides of the fixed frame 21, the pulling plate 24 is pulled, the pulling plate 24 drives the stretching rod 23 to move, the stretching rod 23 extends out of the fixed frame 21, a user can hold the pulling plate 24 to pull the resistance tester body 1 by hand, the resistance tester body 1 is conveniently carried, the workload of the user is reduced, the practicability of the device is improved, the second rotating block 46 is extruded by the elasticity of the second spring 47, the connecting rod 45 is extruded by the, connecting rod 45 extrudes first rotating block 44, and first rotating block 44 extrudes buffer board 43 can provide certain buffer protection for resistance tester body 1 through buffer board 43, avoids resistance tester body 1 from the landing of user's hand, drops on ground and causes the condition of damage.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims

1. A portable CT circuit open circuit detection device, comprising:

a resistance tester body;

the stretching mechanism is arranged on the surface of the resistance tester body and comprises two fixing frames, two sliding blocks, two stretching rods and a pulling plate, the back surfaces of the two fixing frames are respectively fixed on two sides of the surface of the resistance tester body, two sides of the two sliding blocks respectively slide on two sides of the inner wall of the two fixing frames, the bottom ends of the two stretching rods are respectively fixed on the top parts of the two sliding blocks, the top ends of the two stretching rods penetrate through the fixing frames and extend to the outside of the fixing frames, and two sides of the bottom of the pulling plate are respectively fixed on the top ends of the two stretching rods;

the tops of the two clamping mechanisms are respectively fixed at the bottoms of the two sliding blocks;

the right side of the buffer mechanism is fixed on the left side of the resistance tester body;

the top of the moving mechanism is fixed at the bottom of the resistance tester body;

the left side of the handle is arranged on the right side of the resistance tester body.

2. The portable CT circuit open circuit detection device of claim 1, wherein the clamping mechanism comprises a clamping frame, a stable block, two moving blocks, two clamping rods, two first springs and a clamping groove, the top of the clamping frame is fixed at the bottom of the sliding block, two sides of the top of the two moving blocks slide on two sides of the top of the inner wall of the clamping frame respectively, one end of each clamping rod is fixed on one side of the two moving blocks, and the other end of each clamping rod penetrates through the clamping frame and the fixed frame respectively and extends to the outside of the fixed frame.

3. The device for detecting the open circuit of the CT loop of claim 2, wherein two first springs are respectively disposed between two sides of the stationary block and a side of the stationary block opposite to the two moving blocks, and the engaging groove is disposed on the stationary block.

4. The portable CT circuit open circuit detection device of claim 1, wherein the buffer mechanism comprises a buffer frame, two telescopic rods, a buffer plate, two first rotating blocks, two connecting rods, two second rotating blocks and a second spring, one side of the buffer frame is fixed to one side of the resistance tester body, one ends of the two telescopic rods are respectively fixed to the top and the bottom of one side of the inner wall of the buffer frame, the other ends of the two telescopic rods penetrate through the buffer frame and extend to the outside of the buffer frame, and the top and the bottom of one side of the buffer plate are respectively fixed to one ends of the two telescopic rods.

5. The device for detecting an open circuit in a CT loop of claim 4, wherein one side of the two first rotation blocks is fixed to the top and the bottom of one side of the buffer board, one end of the two connecting rods is rotated to one side of the two first rotation blocks, the other ends of the two connecting rods penetrate through the buffer frame and extend into the buffer frame, one side of the two second rotation blocks slides to the top and the bottom of one side of the inner wall of the buffer frame, the other side of the two second rotation blocks is rotatably connected to one end of the two connecting rods, and the second spring is disposed between the two opposite sides of the two second rotation blocks.

6. The device for detecting the open circuit of the CT circuit as claimed in claim 1, wherein the moving mechanism comprises a housing, a moving plate, two universal wheels, a screw rod, two thread blocks, two transmission rods, two moving blocks, a moving groove and a rotating handle, wherein the top of the housing is fixed at the bottom of the resistance tester body, two sides of the moving plate respectively slide at two sides of the inner wall of the housing, the top of the two universal wheels are respectively fixed at two sides of the bottom of the moving plate, and the bottom of the universal wheels penetrates through the housing and extends to the outside of the housing.

7. The portable CT circuit open detection device of claim 6, one end of the screw rod rotates at the top of one side of the inner wall of the shell, the other end of the screw rod penetrates through the shell and extends to the outside of the shell, one side of the rotating handle is fixed to one end, located outside the shell, of the lead screw, the insides of the two thread blocks are respectively threaded on two sides of the surface of the lead screw, the tops of the two thread blocks are respectively in sliding connection with the top of the inner wall of the shell, one ends of the two transmission rods are respectively rotated on the surfaces of the two thread blocks, the bottoms of the two moving blocks are respectively fixed on two sides of the top of the moving plate, the tops of the two moving blocks are respectively in rotating connection with one ends of the two transmission rods, and the moving groove is formed in the bottom of the shell.