A polarity calibrator for current transformer groups

Abstract

This utility model discloses a current transformer group polarity calibrator, including a calibrator housing. The calibrator housing includes a housing cover and a calibrator body, which are rotatably connected by a hinge. A movable seat is slidably installed on the inner side of the housing cover, and a movable block is slidably installed in the middle of the movable seat. There are several movable blocks. The cable is wound around a winding rod, and then the movable seat is controlled to move along the trajectory of two first positioning rods, which will drive the winding rod to the inner position of the housing cover. Then, the housing cover is rotated to connect the housing cover and the calibrator body, so that the winding rod and the cable can be stored inside the calibrator housing without exposing the cable, which is convenient for cable storage. When the cable is wound around the winding rod, the length of the cable determines the diameter of the cable loop when the cable is wound around the winding rod. The position of the movable blocks can be fixed to meet the winding requirements of cables of different lengths.

Description

Technical Field

[0001] This utility model relates to the field of polarity verification technology for current transformer groups, specifically a polarity verification instrument for current transformer groups. Background Technology

[0002] A current transformer is an instrument that measures a large primary current by converting a small secondary current into a large primary current based on the principle of electromagnetic induction. A current transformer calibrator is a high-performance automated testing device that can be used to accurately measure and calibrate the impedance error of the secondary load in a current transformer. It is widely used in power grid construction, equipment commissioning, and maintenance, and is an important link in ensuring the safe operation of the power system, effectively preventing power outages caused by polarity problems. In the current technology, in order to facilitate polarity detection and calibration of current transformers in different locations, polarity calibrators are gradually developing towards portability. The most widely used type is a box-type polarity calibrator, which is convenient to carry.

[0003] In the "Portable Current Transformer Field Verification Instrument" with authorization announcement number "CN218298509U", this portable current transformer field verification instrument adds a first placement cavity and a second placement cavity inside the box cover, making full use of the space of the box cover for the storage of corresponding items. It also provides protection through the setting of a rubber placement seat, convenient cable and current clamp, thereby solving the problem of still needing packaging in the prior art and improving portability. At the same time, the current clamp moves with it, reducing the probability of being forgotten or discarded. Furthermore, the setting of multiple sets of winding rods facilitates storage and avoids the situation where the cable is too long and occupies a large area. It also provides a certain degree of protection. However, in use, the multiple sets of winding rods are set on the outside of the box, and the cable is exposed to the outside, which is inconvenient for cable storage. At the same time, the position of the winding rods on the hollow base cannot be adjusted and fixed according to the cable winding situation, making it inconvenient to use. Utility Model Content

[0004] The purpose of this invention is to provide a polarity calibrator for current transformer groups to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a current transformer group polarity calibrator, comprising a calibrator housing, the calibrator housing including a housing cover and a calibrator body, the housing cover and the calibrator body being rotatably connected by a hinge, a movable base being slidably installed on the inner side of the housing cover, a movable block being slidably installed in the middle of the movable base, a plurality of movable blocks, a winding rod being fixedly installed in the middle of one side of the movable block, and a positioning component for fixing the position of the movable block being provided between the movable block and the movable base.

[0006] As a further preferred embodiment of this technical solution, a first positioning rod is symmetrically fixedly installed on the inner side of the box cover, and a first positioning hole is opened at both ends of the movable seat, and the first positioning rod is slidably connected to the first positioning hole.

[0007] As a further preferred embodiment of this technical solution, a first sliding hole is provided in the middle of one side of the movable seat, a first sliding rod is slidably installed inside the first sliding hole, a first spring is sleeved on the outer side of the middle end of the first sliding rod, one end of the first spring is fixedly connected to the outer side of the bottom end of the first sliding rod, and the other end of the first spring is fixedly connected to the lower surface of the movable seat. A first fixing hole and a second fixing hole are respectively provided in the middle and end positions of the inner side of the box cover, and the bottom end of the first sliding rod can be slidably inserted into the first fixing hole and the second fixing hole.

[0008] As a further preferred embodiment of this technical solution, a second positioning rod is symmetrically fixedly installed in the middle of the movable seat, and the movable block is slidably installed between the two second positioning rods.

[0009] As a further preferred embodiment of this technical solution, the positioning component includes a second sliding hole, a second sliding rod, a second spring, and a third fixing hole. The moving block has a second sliding hole in its center, and a second sliding rod is slidably installed inside the second sliding hole. A second spring is sleeved on the outer side of the top end of the second sliding rod. One end of the second spring is fixedly connected to the top end of the second sliding rod, and the other end of the second spring is fixedly connected to the upper surface of the moving block. The moving base has a third fixing hole equidistantly opened in the center of its bottom end, and the bottom end of the second sliding rod can be slidably inserted into the interior of the third fixing hole.

[0010] As a further preferred embodiment of this technical solution, a retaining ring is installed at the end of the winding rod away from the moving block, and an insert block is fixedly installed in the middle of one side of the retaining ring. An insertion hole is opened at the end of the winding rod away from the moving block, and a rubber ring is installed inside the insertion hole. The insert block is slidably inserted into the inner ring of the rubber ring. A fixing rod is fixedly installed in a ring array on one side of the retaining ring with the central axis of the retaining ring as the axis.

[0011] As a further preferred embodiment of this technical solution, rubber fixing brackets are fixedly installed at equal intervals on the inner side of the box cover, and current clamps are installed in the middle of the rubber fixing brackets.

[0012] This utility model provides a polarity checker for a current transformer group, which has the following advantages:

[0013] (1) This utility model involves winding the cable around the winding rod, then controlling the moving seat to move along the trajectory of the two first positioning rods, which will drive the winding rod to the inner position of the box cover. Then, the box cover is rotated to connect the box cover with the calibrator body. The winding rod and cable can be stored inside the calibrator box without exposing the cable, which is convenient for storing the cable.

[0014] (2) By moving the moving block along the trajectory of the second positioning rod, the distance between the winding rods on the two moving blocks can be adjusted, and the position of the moving block can be fixed by the positioning component, which can meet the winding requirements of cables of different lengths. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0017] Figure 3 This is one of the schematic diagrams of a partial explosion structure of this utility model;

[0018] Figure 4 This is the second schematic diagram of the partial explosion structure of this utility model;

[0019] In the diagram: 1. Calibrator housing; 2. Housing cover; 3. Calibrator body; 4. Movable base; 5. Movable block; 6. Winding rod; 7. Positioning assembly; 8. First positioning rod; 9. First positioning hole; 10. First sliding hole; 11. First sliding rod; 12. First spring; 13. First fixing hole; 14. Second fixing hole; 15. Second positioning rod; 16. Second sliding hole; 17. Second sliding rod; 18. Second spring; 19. Third fixing hole; 20. Retaining ring; 21. Insertion block; 22. Insertion hole; 23. Rubber ring; 24. Fixing rod; 25. Rubber fixing bracket; 26. Current clamp. Detailed Implementation

[0020] 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.

[0021] This utility model provides a technical solution: such as Figures 1 to 4As shown in this embodiment, a current transformer group polarity calibrator includes a calibrator housing 1. The calibrator housing 1 includes a housing cover 2 and a calibrator body 3. The housing cover 2 and the calibrator body 3 are rotatably connected by a hinge. A movable base 4 is slidably installed on the inner side of the housing cover 2. A movable block 5 is slidably installed in the middle of the movable base 4. There are several movable blocks 5. A winding rod 6 is fixedly installed in the middle of one side of each movable block 5. A positioning component 7 is provided between the movable block 5 and the movable base 4 to fix the position of the movable block 5. The cable is wound around the winding rod 6. Then, the control moving seat 4 moves along the trajectory of the two first positioning rods 8, which will drive the winding rod 6 to the inner position of the box cover 2. Then, the box cover 2 is rotated to connect the box cover 2 with the calibrator body 3. The winding rod 6 and the cable can be stored inside the calibrator box 1 without exposing the cable, which is convenient for storing the cable. When the cable is wound around the winding rod 6, the length of the cable determines the diameter of the cable loop when the cable is wound around the winding rod 6. The position of the moving block 5 can be fixed to meet the winding requirements of cables of different lengths.

[0022] like Figures 1 to 4 As shown, a first positioning rod 8 is symmetrically fixedly installed on the inner side of the box cover 2. A first positioning hole 9 is opened at both ends of the movable seat 4. The first positioning rod 8 is slidably connected to the first positioning hole 9. A first sliding hole 10 is opened in the middle of one side of the movable seat 4. A first sliding rod 11 is slidably installed inside the first sliding hole 10. A first spring 12 is sleeved on the outer side of the middle end of the first sliding rod 11. One end of the first spring 12 is fixedly connected to the outer side of the bottom end of the first sliding rod 11. The other end of the first spring 12 is fixedly connected to the lower surface of the movable seat 4. A first fixing hole 13 and a second fixing hole 14 are opened at the middle and end positions of the inner side of the box cover 2, respectively. The bottom end of the first sliding rod 11 can be slidably inserted into the first fixing hole 13 and the second fixing hole 14.

[0023] During the process of moving the movable seat 4, the first slide rod 11 can be inserted into the first sliding hole 10 by pulling the first slide rod 11 by the first spring 12. By sliding the bottom end of the first slide rod 11 into the first fixing hole 13 or the second fixing hole 14, the movable seat 4 can be fixed at different positions.

[0024] like Figures 1 to 4As shown, the movable base 4 is symmetrically fixedly installed with second positioning rods 15 in the middle. The movable block 5 is slidably installed between the two second positioning rods 15. The positioning component 7 includes a second sliding hole 16, a second sliding rod 17, a second spring 18, and a third fixing hole 19. The movable block 5 has a second sliding hole 16 in the middle. The second sliding rod 17 is slidably installed inside the second sliding hole 16. The second spring 18 is sleeved on the outer side of the top end of the second sliding rod 17. One end of the second spring 18 is fixedly connected to the top end of the second sliding rod 17, and the other end of the second spring 18 is fixedly connected to the upper surface of the movable block 5. The movable base 4 has a third fixing hole 19 equidistantly opened in the middle of the bottom end. The bottom end of the second sliding rod 17 can be slidably inserted into the interior of the third fixing hole 19.

[0025] The second spring 18 pulls the second slide rod 17, causing the bottom end of the second slide rod 17 to slide into the third fixing hole 19 at the designated position, thereby fixing the position of the moving block 5.

[0026] like Figures 1 to 4 As shown, a retaining ring 20 is installed at the end of the winding rod 6 away from the moving block 5. An insert block 21 is fixedly installed in the middle of one side of the retaining ring 20. An insertion hole 22 is opened at the end of the winding rod 6 away from the moving block 5. A rubber ring 23 is installed inside the insertion hole 22. The insert block 21 is slidably inserted into the inner ring of the rubber ring 23. A fixing rod 24 is fixedly installed in a ring array on one side of the retaining ring 20 with the central axis of the retaining ring 20 as the axis.

[0027] Insert the insert block 21 on the retaining ring 20 into the rubber ring 23 inside the socket 22. The retaining ring 20 can be installed at the end of the winding rod 6 by the friction of the rubber ring 23. At the same time, the fixing rod 24 on the retaining ring 20 can position the cable wound on the winding rod 6 to prevent the cable from becoming loose on the winding rod 6.

[0028] like Figures 1 to 4 As shown, rubber fixing brackets 25 are fixedly installed at equal intervals on the inner side of the box cover 2, and current clamps 26 are installed in the middle of the rubber fixing brackets 25.

[0029] The cylindrical handle of the current clamp 26 can be installed in the middle of the rubber bracket 25. The current clamp 26 can be fixed in the middle of the rubber bracket 25 by the deformation of the rubber bracket 25, which makes it convenient for the operator to take out the current clamp 26.

[0030] This utility model provides a polarity calibrator for a current transformer group, the specific working principle of which is as follows:

[0031] When the device is in use, the winding rod 6 on the moving block 5 protrudes from the box cover 2. Since the cable included in the current clamp 26 is relatively long, the cable can be wound around the winding rod 6. Then, the insert block 21 on the retaining ring 20 is inserted into the rubber ring 23 inside the socket 22. Through the friction of the rubber ring 23, the retaining ring 20 can be installed at the end of the winding rod 6. At the same time, the fixing rod 24 on the retaining ring 20 can position the cable wound on the winding rod 6 to prevent the cable from becoming loose on the winding rod 6. Then, the moving seat 4 is controlled to move along the trajectory of the two first positioning rods 8, which will move the winding rod 6 to the inner position of the box cover 2. Then, the box cover 2 is rotated to connect the box cover 2 with the calibrator body 3. The winding rod 6 and the cable can be stored inside the calibrator box 1 without exposing the cable, which is convenient for storing the cable.

[0032] When the cable is wound around the winding rod 6, the length of the cable determines the diameter of the cable loop when the cable is wound around the winding rod 6. The moving block 5 can be moved along the trajectory of the second positioning rod 15, and the distance between the winding rod 6 on the two moving blocks 5 can be adjusted. The second slide rod 17 is pulled by the second spring 18, which will drive the bottom end of the second slide rod 17 to slide into the third fixing hole 19 at the designated position, so as to fix the position of the moving block 5, thereby meeting the winding requirements of cables of different lengths.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A polarity calibrator for a current transformer group, comprising a calibrator housing (1), the calibrator housing (1) comprising a housing cover (2) and a calibrator body (3), the housing cover (2) and the calibrator body (3) being rotatably connected by a hinge, characterized in that: A movable seat (4) is slidably installed on the inner side of the box cover (2). A movable block (5) is slidably installed in the middle of the movable seat (4). There are several movable blocks (5). A winding rod (6) is fixedly installed in the middle of one side of the movable block (5). A positioning component (7) for fixing the position of the movable block (5) is provided between the movable block (5) and the movable seat (4).

2. The polarity calibrator for a current transformer group according to claim 1, characterized in that: The inner side of the box cover (2) is symmetrically fixed with a first positioning rod (8), and the two ends of the movable seat (4) are provided with a first positioning hole (9). The first positioning rod (8) is slidably connected to the first positioning hole (9).

3. The polarity calibrator for a current transformer group according to claim 2, characterized in that: A first sliding hole (10) is provided in the middle of one side of the movable seat (4). A first sliding rod (11) is slidably installed inside the first sliding hole (10). A first spring (12) is sleeved on the outer side of the middle end of the first sliding rod (11). One end of the first spring (12) is fixedly connected to the outer side of the bottom end of the first sliding rod (11). The other end of the first spring (12) is fixedly connected to the lower surface of the movable seat (4). A first fixing hole (13) and a second fixing hole (14) are provided in the middle and end positions of the inner side of the box cover (2). The bottom end of the first sliding rod (11) can be slidably inserted into the first fixing hole (13) and the second fixing hole (14).

4. A current transformer group polarity calibrator according to claim 3, characterized in that: The movable seat (4) is symmetrically fixedly installed with second positioning rods (15) in the middle, and the movable block (5) is slidably installed between the two second positioning rods (15).

5. A polarity calibrator for a current transformer group according to claim 1, characterized in that: The positioning component (7) includes a second sliding hole (16), a second sliding rod (17), a second spring (18), and a third fixing hole (19). The second sliding hole (16) is provided in the middle of the moving block (5). The second sliding rod (17) is slidably installed inside the second sliding hole (16). The second spring (18) is sleeved on the outer side of the top end of the second sliding rod (17). One end of the second spring (18) is fixedly connected to the top end of the second sliding rod (17), and the other end of the second spring (18) is fixedly connected to the upper surface of the moving block (5). The third fixing hole (19) is provided at equal intervals in the middle of the bottom end of the moving seat (4). The bottom end of the second sliding rod (17) can be slidably inserted into the interior of the third fixing hole (19).

6. A polarity calibrator for a current transformer group according to claim 1, characterized in that: A retaining ring (20) is installed at the end of the winding rod (6) away from the moving block (5). A plug (21) is fixedly installed in the middle of one side of the retaining ring (20). A plug hole (22) is opened at the end of the winding rod (6) away from the moving block (5). A rubber ring (23) is installed inside the plug hole (22). The plug (21) is slidably inserted into the inner ring of the rubber ring (23). A fixing rod (24) is fixedly installed in a ring array on one side of the retaining ring (20) with the central axis of the retaining ring (20) as the axis.

7. A current transformer group polarity calibrator according to claim 1, characterized in that: Rubber fixing brackets (25) are fixedly installed at equal intervals on the inner side of the box cover (2), and a current clamp (26) is installed in the middle of the rubber fixing bracket (25).

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