Transformer CT nuclear phase short circuit trolley

Abstract

The utility model discloses a transformer CT nuclear phase short circuit trolley. Comprising a vehicle body, a movable frame movably arranged at the top of the vehicle body, a back plate fixed to the top of the movable frame, a supporting frame fixed to the front surface of the back plate, a plurality of insulating supporting bases fixed to the front surface of the supporting frame, fixed frames fixed to the front ends of the insulating supporting bases, and short-circuit copper plates fixed to the front surfaces of the multiple fixed frames. According to the utility model, through the designed short-circuit trolley, when a CT nuclear phase test is carried out after a high-plant transformer overhaul CT wire is disassembled and connected, rapid short circuit and reliable grounding at the low-voltage side of the high-plant transformer can be realized, the operation is convenient, good contact of a contact is ensured, the operation is convenient during the test, and the low-voltage side trolley switch of the transformer only needs to be shaken out. Short circuit grounding of the low-voltage side of the transformer can be achieved by shaking the short circuit trolley, the operation time of personnel in the CT nuclear phase test process of the transformer can be greatly shortened, then unit grid connection is carried out in advance, and the grid connection operation time of a generator set is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer CT phase discrimination, and particularly relates to a transformer CT phase discrimination short-circuit trolley. Background Art

[0002] During the maintenance of the high-voltage auxiliary transformer in the power plant, after the CT disconnection and connection, a CT phase discrimination test needs to be carried out, that is, the low-voltage side of the transformer is short-circuited, and then the generator is slowly excited to reach the transformer current that can be phase discriminated. However, there is no device in the prior art that is convenient for short-circuit grounding of the low-voltage side of the transformer. In actual operation, the low-voltage side of the transformer is short-circuited manually and then grounded, resulting in low operation efficiency, indirectly prolonging the transformer phase discrimination test time, delaying the unit grid connection time, and shortening the grid-connected operation time of the generator set. Therefore, the utility model proposes a transformer CT phase discrimination short-circuit trolley. Content of the Utility Model

[0003] The purpose of the utility model is to provide a transformer CT phase discrimination short-circuit trolley to solve the problems put forward in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A transformer CT phase discrimination short-circuit trolley, comprising

[0005] a vehicle body, a movable frame movably arranged on the top of the vehicle body, a back plate fixed on the top of the movable frame, a support frame fixed on the front surface of the back plate, a plurality of insulating support seats fixed on the front surface of the support frame, a fixed frame fixed on the front end of the insulating support seat, a short-circuit copper plate fixed on the front surfaces of a plurality of fixed frames, a plurality of wiring terminals installed on the front surface of the short-circuit copper plate, a plurality of elastic contacts arranged at the front ends of the wiring terminals, and a grounding copper plate fixed on the front surface of the short-circuit copper plate and grounded through a connecting wire at the bottom;

[0006] And a movable protection mechanism arranged on the surface of the wiring terminal.

[0007] Preferably, two moving rollers are installed on both sides of the vehicle body.

[0008] Preferably, a push-in screw rod is arranged on the front surface of the vehicle body.

[0009] Preferably, the movable protection mechanism includes a movable base sleeve slidably sleeved on the rear end surface of the wiring terminal and a protection sleeve fixed on the front surface of the movable base sleeve. Two strip-shaped sliders are fixed on the inner wall of the movable base sleeve, and two strip-shaped chutes corresponding to the strip-shaped sliders are symmetrically arranged on the surface of the wiring terminal. The strip-shaped sliders slide in the strip-shaped chutes.

[0010] Preferably, the movable protection mechanism further includes a limiting structure, which includes a T-shaped sliding groove opened on the rear surface of the movable base sleeve, a spring and a T-shaped sliding block installed in the T-shaped sliding groove, a limiting clamping rod fixed to the bottom of the T-shaped sliding block, and two limiting clamping grooves opened on the inner wall of the strip-shaped sliding groove. The end of the limiting clamping rod penetrates into one of the limiting clamping grooves, and one end of the T-shaped sliding block extends out of the rear surface of the movable base sleeve and is fixed with a side dial block.

[0011] Preferably, a cylindrical groove is opened at the top end of the T-shaped sliding groove. The top end of the spring is inserted into the cylindrical groove, and the bottom end of the spring abuts against the top surface of the T-shaped sliding block.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: By designing the short-circuit trolley, when the CT connection and disconnection are carried out during the maintenance of the high-voltage plant transformer and the CT phase verification test is performed, the low-voltage side of the high-voltage plant transformer can be quickly short-circuited and reliably grounded. The operation is convenient and it is ensured that the contact of the contact head is good. During the test, the operation is convenient. Only need to withdraw the low-voltage side trolley switch of the transformer and then push in this short-circuit trolley to realize the short-circuit of the low-voltage side of the transformer, which can greatly shorten the operation time of the personnel during the CT phase verification test of the transformer, thereby shortening the CT phase verification test time of the transformer, advancing the grid connection of the unit, and increasing the grid-connected operation time of the generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is a bottom view of the present utility model;

[0015] Figure 3 is a front view of the present utility model;

[0016] Figure 4 is a cross-sectional view of the connection between the movable base sleeve and the contact head seat of the present utility model;

[0017] Figure 5 For the present utility model Figure 4 is a partial enlarged view of area A;

[0018] In the figure: 1, vehicle body; 2, movable frame; 3, back plate; 4, support frame; 5, insulating support seat; 6, fixed frame; 7, short-circuit copper plate; 8, wiring column; 9, elastic contact head; 10, grounding copper plate; 11, moving roller; 12, push-in lead screw; 13, movable base sleeve; 14, protective sleeve; 15, strip-shaped slider; 16, strip-shaped sliding groove; 17, limiting structure; 171, T-shaped sliding groove; 172, spring; 173, T-shaped sliding block; 174, limiting clamping rod; 175, limiting clamping groove; 176, side dial block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Embodiment

[0021] Please refer to Figures 1 to 5 , which is an embodiment of the present utility model. This embodiment provides a technical solution: a transformer CT phase-checking short-circuit trolley, including

[0022] a vehicle body 1, a movable frame 2 movably arranged on the top of the vehicle body 1, a back plate 3 welded and fixed on the top of the movable frame 2, a support frame 4 welded and fixed on the front surface of the back plate 3, a plurality of insulating support seats 5 fixed on the front surface of the support frame 4 by bolts, a fixed frame 6 fixed on the front end of the insulating support seat 5 by bolts, a short-circuit copper plate 7 fixed on the front surfaces of a plurality of fixed frames 6 by bolts, a plurality of wiring terminals 8 installed on the front surface of the short-circuit copper plate 7, a plurality of elastic contact heads 9 arranged at the front ends of the wiring terminals 8, and a grounding copper plate 10 fixed on the front surface of the short-circuit copper plate 7 by bolts and grounded at the bottom through a connecting wire. The three wiring terminals 8 are connected by the short-circuit copper plate 7 to achieve the short-circuit of three-phase electricity;

[0023] and a movable protection mechanism arranged on the surface of the wiring terminal 8.

[0024] Among them, two moving rollers 11 are installed on both sides of the vehicle body 1 for pushing the vehicle body 1.

[0025] Among them, a feed-in lead screw 12 is provided on the front surface of the vehicle body 1. The rear end of the feed-in lead screw 12 is rotatably installed in a strip-shaped groove at the top of the vehicle body 1. At the same time, a nut seat is sleeved and installed at the rear end of the feed-in lead screw 12. The top end of the nut seat is fixed to the bottom surface of the movable frame 2. When the feed-in lead screw 12 rotates subsequently, it will drive the nut seat and the movable frame 2 to displace under the action of the thread, realizing the feed-in of the movable frame 2 and the elastic contact 9 (the structure and principle of this part of the feed-in function are both the prior art in the existing switch trolley. For details, refer to the existing patent with the publication number CN204462260U, and will not be elaborated here). In actual use, during the test of short-circuiting the low-voltage side of the transformer, the high-voltage plant transformer low-voltage side switch is withdrawn. First, the vehicle body 1 is pushed to the high-voltage plant transformer low-voltage side interval, and the feed-in lead screw 12 is shaken, so that the movable frame 2 and the terminal post 8 are fed in, causing the elastic contact 9 at the front end of the terminal post 8 to quickly contact the low-voltage side contact inside the transformer. Since the three terminal posts 8 are all connected by the short-circuit copper plate 7, the low-voltage side of the transformer can be short-circuited, and it can be quickly grounded under the action of the grounding copper plate 10, which can greatly shorten the operation time of personnel during the transformer CT phase verification test, and then the unit grid connection can be advanced in advance, improving the grid connection operation time of the generator set.

[0026] Among them, the movable protection mechanism includes a movable base sleeve 13 slidably sleeved on the rear surface of the terminal post 8 and a protective sleeve 14 fixed on the front surface of the movable base sleeve 13. Subsequently, the movable base sleeve 13 can be slid forward, and the protective sleeve 14 covers the elastic contact 9 at the front end of the terminal post 8 inside, so as to protect the elastic contact 9 when the short-circuit trolley is out of use, preventing it from being damaged by foreign object collision. Two strip-shaped sliders 15 are fixed on the inner wall of the movable base sleeve 13. Two strip-shaped chutes 16 corresponding to the strip-shaped sliders 15 are symmetrically arranged on the surface of the terminal post 8. The strip-shaped sliders 15 slide in the strip-shaped chutes 16, realizing the smooth sliding of the movable base sleeve 13.

[0027] Among them, the movable protection mechanism also includes a limiting structure 17, which includes a T-shaped slide groove 171 opened on the rear surface of the movable base sleeve 13, a spring 172 and a T-shaped slider 173 installed in the T-shaped slide groove 171, a limiting clamping rod 174 welded and fixed at the bottom of the T-shaped slider 173, and two limiting clamping grooves 175 opened on the inner wall of the strip slide groove 16. The end of the limiting clamping rod 174 penetrates into one of the limiting clamping grooves 175 to realize the limitation of the movable base sleeve 13 during daily use. One end of the T-shaped slider 173 extends to the rear surface of the movable base sleeve 13 and is fixed with a side shift block 176, so that the subsequent operator can shift the T-shaped slider 173 and the limiting clamping rod 174 through the side shift block 176. When the short-circuit trolley is subsequently deactivated, the operator can lift the side shift block 176 to make the short-circuit trolley stop. The T-shaped slider 173 slides up and compresses the spring 172, causing the bottom end of the limit rod 174 to move out of the limit groove 175, thereby releasing the limit on the strip slider 15 and the movable base sleeve 13. At this time, the movable base sleeve 13 is slid toward the front end of the terminal 8 until the strip slider 15 slides to the front end of the strip slide groove 16 and cannot slide further, and the side shift block 176 is released. Under the push of the spring 172, the T-shaped slider 173 rebounds with the limit rod 174, and finally the bottom end of the limit rod 174 is inserted into another limit groove 175, so that the limit of the movable base sleeve 13 sliding forward and backward can be achieved. At this time, the protective cover 14 will cover the elastic contact 9 on the inside to play an effective protective role, so that during the out-of-use period of the short-circuit trolley, the elastic contact 9 at the front end of the terminal 8 can be effectively wrapped and protected.

[0028] A cylindrical groove is formed at the top of the T-shaped slide groove 171 , and the top of the spring 172 is inserted into the cylindrical groove, and the bottom of the spring 172 is against the top surface of the T-shaped slide block 173 .

[0029] Although the embodiments of the present invention have been shown and described (see the above detailed description for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transformer CT core phase short-circuit trolley, characterized in that: include A vehicle body (1), a movable frame (2) movably arranged on the top of the vehicle body (1), a back plate (3) fixed on the top of the movable frame (2), a support frame (4) fixed on the front surface of the back plate (3), a plurality of insulating support seats (5) fixed on the front surface of the support frame (4), a fixed frame (6) fixed on the front end of the insulating support seat (5), a short-circuit copper plate (7) fixed on the front surface of the plurality of fixed frames (6), a plurality of connecting posts (8) installed on the front surface of the short-circuit copper plate (7), a plurality of elastic contacts (9) arranged on the front end of the connecting posts (8), a grounding copper plate (10) fixed on the front surface of the short-circuit copper plate (7) and grounded at the bottom via a connecting wire; and a movable protective mechanism arranged on the surface of the connecting post (8).

2. A transformer CT core phase short-circuit trolley according to claim 1, characterized in that: Two movable rollers (11) are installed on both sides of the vehicle body (1).

3. A transformer CT core phase short-circuit trolley according to claim 1, characterized in that: The front surface of the vehicle body (1) is provided with a screw rod (12).

4. A transformer CT core phase short-circuit trolley according to claim 1, characterized in that: The movable protection mechanism comprises a movable base sleeve (13) slidably sleeved on the rear end surface of the terminal post (8) and a protection sleeve (14) fixed on the front surface of the movable base sleeve (13).

5. A transformer CT core phase short-circuit trolley according to claim 4, characterized in that: Two strip-shaped sliders (15) are fixed to the inner wall of the movable base sleeve (13), and two strip-shaped slide grooves (16) corresponding to the strip-shaped sliders (15) are symmetrically provided on the surface of the terminal (8), and the strip-shaped sliders (15) are slidably located in the strip-shaped slide grooves (16).

6. A transformer CT core phase short-circuit trolley according to claim 4, characterized in that: The movable protection mechanism further comprises a limiting structure (17), wherein the limiting structure (17) comprises a T-shaped slide groove (171) provided on the rear surface of the movable base sleeve (13), a spring (172) and a T-shaped slider (173) installed in the T-shaped slide groove (171), a limiting clamping rod (174) fixed at the bottom of the T-shaped slider (173), and two limiting clamping grooves (175) provided on the inner wall of the strip slide groove (16), wherein an end of the limiting clamping rod (174) passes through one of the limiting clamping grooves (175).

7. A transformer CT core phase short-circuit trolley according to claim 6, characterized in that: One end of the T-shaped sliding block (173) extends out to the rear surface of the movable base sleeve (13) and is fixed with a side shift block (176).

8. The transformer CT core phase short-circuit trolley according to claim 6, characterized in that: A cylindrical groove is formed at the top of the T-shaped slide groove (171), the top of the spring (172) is inserted into the cylindrical groove, and the bottom of the spring (172) abuts against the top surface of the T-shaped slide block (173).

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