Hydropower station shaft current transformer calibration device

Abstract

The utility model provides a hydropower station shaft current transformer verification device, which relates to the field of current transformer verification, and comprises an elastic clamp, hand-held ends of the elastic clamp are respectively connected with leads, conduction semi-rings are embedded in clamping ends of the elastic clamp, and the two conduction semi-rings are respectively connected with the leads. The two conduction semi-rings are connected when the clamping end of the elastic clamp is closed, a groove is formed in the handheld end of the elastic clamp, and a clamping electric piece is fixedly installed in the groove. According to the hydropower station shaft current transformer verification device, the current limiting fuse is selected to be connected into a circuit according to the induction current range of the current transformer, two wires are connected into a wiring end of an existing current transformer detection device, the other group of wires are used for electrifying the current transformer, the elastic clamp is clamped on the outer surface of the current transformer, and the current transformer is connected with the current transformer. Therefore, the detection circuit can be quickly switched on.

Description

Technical Field

[0001] This utility model relates to the field of current transformer verification technology, specifically a verification device for a hydropower station shaft current transformer. Background Technology

[0002] The calibrator typically contains a standard voltage transformer with the same transformation ratio as the current transformer under test, achieving a high level of accuracy, such as 0.05%. By measuring the transformation ratio and no-load error of the current transformer under test, and combining this with the impedance and admittance test results, the ratio error and phase angle error of the transformer can be calculated. For example, the existing HGQL-H model current transformer field calibrator can perform this function.

[0003] During the calibration of current transformers, a conductive terminal needs to be set in the middle of the current transformer. The primary side wiring requires connecting two wires to the conductive terminal respectively, and then connecting the secondary side wires to the current transformer. In this process, the primary side wiring is relatively inconvenient and the conductor passing through the current transformer needs to be prepared in advance. At the same time, the testing device needs to replace the current-limiting fuse according to the current of the current transformer to protect the circuit. The existing current-limiting fuse is located inside the testing box, which makes replacement inconvenient. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a calibration device for shaft current transformers in hydropower stations, which solves the problems mentioned in the background art.

[0005] Technical solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hydropower station shaft current transformer calibration device, comprising an elastic clamp, wherein the hand-held end of the elastic clamp is connected to a wire, and a conductive half-ring is embedded inside the clamping end of the elastic clamp, the two conductive half-rings are respectively connected to the wire, and the two conductive half-rings are connected when the clamping end of the elastic clamp is closed. The hand-held end of the elastic clamp is provided with a groove, and a snap-fit ​​electrical piece is fixedly installed inside the groove. The wire is connected to both ends of the snap-fit ​​electrical piece, and a replaceable current-limiting fuse is snapped into the middle of the snap-fit ​​electrical piece. A cover plate covering the groove is snapped onto the surface of the groove.

[0007] Furthermore, the handheld end of the elastic clip is provided with a receiving groove, the inside of the receiving groove is provided with a slot for placing a current-limiting fuse, and the surface of the receiving groove is provided with a baffle covering the receiving groove.

[0008] Furthermore, a roller is rotatably connected inside the groove. The roller is located between the snap-fit ​​electrical pieces. A set of placement slots is opened on the surface of the roller. Current-limiting fuses of different specifications are snapped into the placement slots, and one of the current-limiting fuses is in contact with the snap-fit ​​electrical piece.

[0009] Furthermore, a friction wheel is fixedly installed at one end of the roller, and the friction wheel extends above the cover plate.

[0010] Furthermore, an indicator wheel is fixedly installed at one end of the roller, and the surface of the indicator wheel is provided with an indicator corresponding to the current-limiting fuse. The indicator wheel extends to the top of the cover plate.

[0011] Furthermore, the markings are set on the surface of the friction wheel.

[0012] Furthermore, the identifier is a digital etching that corresponds to the current-limiting fuse that can withstand the maximum current.

[0013] Furthermore, the identifier is a notch that can be proportionally enlarged to the maximum current of the corresponding current-limiting fuse.

[0014] Furthermore, an elastic sleeve is fixedly installed inside the groove, and the free end of the elastic sleeve presses against the electrical piece close to the current-limiting fuse.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The current transformer verification device for this hydropower station selects a current-limiting fuse to be connected to the circuit according to the current transformer's induced current range. Two wires are connected to the wiring terminals of the existing current transformer detection device, and another set of wires is used to energize the current transformer. The elastic clamp is then attached to the outer surface of the current transformer, thereby enabling rapid connection of the detection circuit.

[0017] 2. The current transformer calibration device of this hydropower station moves the current-limiting fuse, which was originally set inside the testing device, to the inside of the elastic clamp, and sets rollers to hold current-limiting fuses of different sizes. This makes it easy to switch current-limiting fuses and replace them when they are damaged. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the connection of the receiving groove of this utility model;

[0020] Figure 3 This is a schematic diagram of the groove connection of this utility model;

[0021] Figure 4 This is a schematic diagram of the roller connection of this utility model;

[0022] Figure 5 This is a schematic diagram of the connection of the snap-fit ​​electrical piece of this utility model.

[0023] Among them, 1. elastic clip; 2. wire; 3. conductive half ring; 4. groove; 5. snap-fit ​​electrical piece; 6. current limiting fuse; 7. cover plate; 8. receiving groove; 9. slot; 10. baffle; 11. roller; 12. placement groove; 13. friction wheel; 14. marking wheel; 15. marking; 16. elastic sleeve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] See Figures 1-5 A current transformer calibration device for a hydropower station includes an elastic clamp 1. The handheld end of the elastic clamp 1 is connected to a conductor 2. The elastic clamp 1 is externally insulated. A conductive half-ring 3 is embedded inside the clamping end of the elastic clamp 1. The two conductive half-rings 3 are connected to the conductor 2 respectively. The two conductive half-rings 3 are connected when the clamping end of the elastic clamp 1 is closed. The handheld end of the elastic clamp 1 has a groove 4. A snap-fit ​​electrical piece 5 is fixedly installed inside the groove 4. The conductor 2 is connected to both ends of the snap-fit ​​electrical piece 5. A replaceable current-limiting fuse 6 is snapped into the middle of the snap-fit ​​electrical piece 5. A cover plate 7 covering the groove 4 is snapped onto the surface of the groove 4. By optimizing the circuit connection part so that the elastic clamp 1 can be directly clamped on the outer surface of the current transformer, the circuit connection can be quickly realized.

[0026] The handheld end of the elastic clip 1 is provided with a receiving groove 8, and the inside of the receiving groove 8 is provided with a slot 9 for placing the current limiting fuse 6. The surface of the receiving groove 8 is provided with a baffle 10 covering the receiving groove 8. This arrangement allows the current limiting fuse 6 to be temporarily stored.

[0027] The groove 4 is rotatably connected to a roller 11, which is located between the snap-fit ​​electrical pieces 5. A set of placement slots 12 are opened on the surface of the roller 11. Different specifications of current-limiting fuses 6 are snapped into the inside of the placement slots 12, and one of the current-limiting fuses 6 is in contact with the snap-fit ​​electrical pieces 5. This setting enables quick replacement of the current-limiting fuses 6.

[0028] A friction wheel 13 is fixedly installed at one end of the roller 11, and the friction wheel 13 extends above the cover plate 7. This arrangement facilitates the rotation of the roller 11.

[0029] A marker wheel 14 is fixedly installed at one end of the roller 11. The surface of the marker wheel 14 is provided with a marker 15 corresponding to the current limiting fuse 6. The marker wheel 14 extends to the top of the cover plate 7. This arrangement makes it easy to identify which current limiting fuse 6 is connected to the circuit.

[0030] The marking 15 is set on the surface of the friction wheel 13. This setting can remove the marking wheel 14 structure while also identifying the current limiting fuse 6.

[0031] The mark 15 is a digital etching of the maximum current that the corresponding current-limiting fuse 6 can pass through. The mark 15 is engraved laterally on the surface of the friction wheel 13.

[0032] Identifier 15 is a gap that can be proportionally enlarged to the maximum current of the corresponding current-limiting fuse 6. This setting allows for the identification of the current-limiting fuse 6 by observing the gap.

[0033] An elastic sleeve 16 is fixedly installed inside the groove 4. The free end of the elastic sleeve 16 presses against the clamping piece 5 near the current limiting fuse 6. This arrangement can press against the clamping piece 5 to achieve stable circuit contact.

[0034] In use, select the current-limiting fuse 6 according to the current range of the current transformer and connect it to the circuit. Connect the two wires 2 to the terminals of the existing current transformer detection device. At the same time, energize the current transformer with another set of wires. Clamp the elastic clip 1 to the outer surface of the current transformer to achieve quick connection of the detection circuit. By moving the current-limiting fuse 6, which was originally set inside the detection device, to the inside of the elastic clip 1, and setting rollers 11 to hold current-limiting fuses 6 of different sizes, it is easy to switch the current-limiting fuse 6 and to replace it easily after the current-limiting fuse 6 is damaged.

[0035] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for calibrating a hydroelectric power station shaft current transformer, comprising an elastic clamp (1), characterized in that: The handheld end of the elastic clip (1) is connected to the wire (2) respectively. The clamping end of the elastic clip (1) is inlaid with a conductive half-ring (3). The two conductive half-rings (3) are connected to the wire (2) respectively. The two conductive half-rings (3) are connected when the clamping end of the elastic clip (1) is closed. The elastic clip (1) has a groove (4) at the hand-held end. A snap-fit ​​electrical piece (5) is fixedly installed inside the groove (4). A wire (2) is connected to both ends of the snap-fit ​​electrical piece (5). A replaceable current-limiting fuse (6) is snapped into the middle of the snap-fit ​​electrical piece (5). A cover plate (7) covering the groove (4) is snapped into the surface of the groove (4).

2. The device for calibrating the shaft current transformer of a hydropower station according to claim 1, characterized in that: The elastic clip (1) has a receiving groove (8) at its hand-held end. The receiving groove (8) has a slot (9) for placing a current-limiting fuse (6) inside. The surface of the receiving groove (8) has a baffle (10) covering the receiving groove (8).

3. A device for calibrating a hydroelectric power station shaft current transformer according to claim 1 or 2, characterized in that: The groove (4) is rotatably connected to a roller (11), which is located between the snap-fit ​​electrical pieces (5). A set of placement slots (12) are opened on the surface of the roller (11), and current-limiting fuses (6) of different specifications are snapped into the inside of the placement slots (12), with one of the current-limiting fuses (6) contacting the snap-fit ​​electrical piece (5).

4. A hydroelectric power station shaft current transformer calibrating device according to claim 3, characterized in that: A friction wheel (13) is fixedly installed at one end of the roller (11), and the friction wheel (13) extends above the cover plate (7).

5. A hydroelectric power station shaft current transformer verification device according to claim 4, characterised in that: One end of the roller (11) is fixedly equipped with a marking wheel (14), and the surface of the marking wheel (14) is provided with a marking (15) corresponding to the current limiting fuse (6). The marking wheel (14) extends to the top of the cover plate (7).

6. A hydroelectric power station shaft current transformer verification device according to claim 5, characterised in that: The mark (15) is set on the surface of the friction wheel (13).

7. A hydroelectric power station shaft current transformer calibrating device according to claim 5, characterized in that: The identifier (15) is a digital etching of the maximum current that the corresponding current-limiting fuse (6) can pass through.

8. The hydroelectric power station shaft current transformer calibrating device according to claim 5, characterized in that: The mark (15) is a gap that can be enlarged proportionally to the maximum current of the corresponding current-limiting fuse (6).

9. A hydropower station shaft current transformer verification device according to claim 7 or 8, characterized in that: An elastic sleeve (16) is fixedly installed inside the groove (4), and the free end of the elastic sleeve (16) presses against the clamping piece (5) near the current limiting fuse (6).

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