Discharge gap post adjustable transformer neutral point grounding device

Abstract

The application discloses a discharge gap adjustable transformer neutral point grounding device under a post, and an insulator post of a lightning arrester is electrically connected with a grounding static contact, a conductive rod and a hanger, the lower end of the insulator post is fixed on a base, a reversing mechanism is arranged on the base, the reversing mechanism is connected with the lower end of a grounding knife arm, and a grounding moving contact is arranged on the upper end of the grounding knife arm; the grounding moving contact corresponds to the grounding static contact; the lower end of the conductive rod and the hanger is provided with an upper discharge electrode, the upper discharge electrode is arranged on the upper part of a discharge insulator, a conductive and lifting post is arranged on the lower part of the discharge insulator, and the upper end of the conductive and lifting post is fixed with a lower discharge electrode; the discharge gap under the post is adjustable through manual or electric driving devices in the box.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, in particular to a neutral point grounding device of transformer. BACKGROUND

[0002] The grounding of the neutral point of the transformer in large substation is realized by the neutral point grounding device, which is composed of isolating switch, lightning arrester, discharge gap, current transformer, etc. (see Figure 4 ). The neutral point grounding device is to install the isolating switch 7, lightning arrester 4, discharge gap 2 and current transformer 3 on the fixed support, and to adjust the distance of the discharge gap before operation (according to the voltage value of the protection), and then to lock it without adjustment, unless it is necessary to manually adjust the support after the power of the entire substation is cut off. In addition, the structure determines that the discharge gap is unstable even after adjustment, which changes with the deformation, vibration of the support and the operation of the isolating switch, resulting in the decline of the protection accuracy and stability. The transverse length of the support is more than 3200mm after the assembly of the entire device, the components are more, the space is larger, and the cost is higher. SUMMARY

[0003] In order to solve the above technical problems, the isolating switch and the lightning arrester are combined with the support insulator and the lightning arrester in the present application, which realizes the support insulator and the lightning protection function at the same time. The other insulator of the isolating switch is used as the grounding pole, and the insulator is also saved according to the grounding function, which is directly replaced by the grounding arm. At the same time, the horizontal discharge gap is changed into the vertical discharge gap device with fixed insulating support, which saves a part of the transverse space, and the transverse length is only 2000mm. The specific technical scheme of the present application is as follows:

[0004] A discharge gap column adjustable neutral point grounding device of transformer, which comprises a lightning arrester and a current transformer, the insulator column of the lightning arrester is fixedly connected with the grounding static contact and the conductive rod and the hanger, the lower end of the insulator column is fixed on the base, the base is further provided with a reversing mechanism, the reversing mechanism is connected with the lower end of the grounding knife arm, the upper end of the grounding knife arm is provided with a grounding moving contact, and the grounding moving contact corresponds to the grounding static contact.

[0005] The lower end of the conductive pole and hanger is provided with an upper discharge electrode, the upper discharge electrode is arranged on the upper mounting plate of the insulating support assembly, the lower part of the insulating support assembly is fixed on the support pipe, and the upper end of the conductive and lifting pole is fixed with a lower discharge electrode; the lower end of the conductive and lifting pole is processed with an internal thread, which is connected with the threaded end of the upper end of the adjusting rotating rod one; the adjusting rotating rod one is connected with the adjusting rotating rod two through the current transformer; the adjusting rotating rod two is connected with the manual or electric driving device in the adjusting box; when the manual or electric driving device in the adjusting box drives the adjusting rotating rod two to rotate, the adjusting rotating rod one arranged in the support pipe is driven to rotate through the connecting head, and the threaded end of the upper end of the adjusting rotating rod one drives the lifting rod to move up and down, so that the distance between the discharge electrodes is adjusted.

[0006] In order to prevent the rotation of the conductive and lifting rod during adjustment, the outer wall of the upper end of the conductive and lifting rod is provided with a through long slot hole, the anti-rotation column pin passes through the round hole on the support pipe and the long slot hole on the conductive and lifting rod in the support pipe, so that the conductive and lifting rod can only move up and down in the support pipe and cannot rotate; the support pipe is fixed on the base.

[0007] The reversing mechanism comprises an upper reversing bevel gear fixed with the grounding knife arm and a lower reversing bevel gear connected with the upper end of the transmission rod; the lower end of the transmission rod is connected with the manual or electric driving device in the adjusting box.

[0008] The discharge insulator is three, and is uniformly arranged at 120° in the same horizontal plane.

[0009] The transmission rod and the adjusting rotating rod are fixed below the base by the connecting head.

[0010] The advantages of the present application are that the post insulator close to the disconnector and the lightning arrester is combined into one, the post insulator is realized, and the lightning effect is realized, one stone two birds; the length of the support is shortened from 3200mm to 2000mm, more than one third of the length space is saved, and the structure is more compact; the manual or electric driving device in the adjusting box is used to directly adjust the discharge protection gap under the post. The vertical discharge gap device can solve the unstable discharge gap caused by operation, vibration or support deformation. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present application;

[0012] Figure 2 It is a support structure schematic diagram of the upper discharge electrode and the lower discharge electrode;

[0013] Figure 3 It is an adjusting structure schematic diagram of the lower discharge electrode;

[0014] Figure 4 This is a schematic diagram of the existing technology. Detailed Implementation

[0015] The invention will now be described in detail with reference to the accompanying drawings. As shown in the drawings, the present invention includes a surge arrester 4 and a current transformer 3 mounted on a base 1. The surge arrester's insulator post 41 is fixedly connected to a grounding stationary contact 7 and a conductive rod / hanger 9, ensuring electrical connection between them. The lower end of the insulator post is fixed to the base 1. A commutation mechanism 10 is also mounted on the base. The commutation mechanism is connected to the lower end of a grounding knife arm 11. A grounding moving contact 8 is mounted on the upper end of the grounding knife arm. The grounding moving contact 8 corresponds to the grounding stationary contact 7.

[0016] The lower end of the conductive rod / hanger 9 is provided with an upper electrode 12, which is mounted on the insulating support assembly (see details). Figure 2 On the upper mounting plate 27, the insulating bracket assembly (see details) Figure 2 The lower part of the rod is fixed to the support tube 16, and the upper end of the conductive lifting rod 20 is fixed with the lower electrode 13. The lower end of the conductive lifting rod 20 is machined with internal threads, which are connected to the upper end of the threaded end rod of the adjusting rotating rod 17. The adjusting rotating rod 17 passes through the current transformer 3 and is connected to the adjusting rotating rod 18. The adjusting rotating rod 18 is connected to the manual or electric drive device in the adjusting box 19. When the manual or electric drive device in the adjusting box 19 drives the adjusting rotating rod 18 to rotate, it drives the adjusting rotating rod 17 set in the support tube 16 to rotate accordingly through the connector. The upper end of the adjusting rotating rod 17 with threaded end rod drives the lifting rod 20 to move up and down, thereby realizing the function of adjusting the distance between the electrodes.

[0017] To prevent the conductive lifting rod 20 from rotating during adjustment, a through slot is provided on the upper outer wall of the conductive lifting rod 20. The anti-rotation pin 15 passes through the round hole on the support tube 16 and through the slot on the conductive lifting rod 20 inside the support tube 16, so that the conductive lifting rod 20 can only move up and down and cannot rotate inside the support tube 16; the support tube 16 is fixed on the base 1.

[0018] The reversing mechanism includes an upper reversing bevel gear 21 fixed to the grounding knife arm 11 and a lower reversing bevel gear 22 connected to the upper end of the transmission rod 24; the lower end of the transmission rod 24 is connected to a manual or electric drive device in the adjustment box 6.

[0019] There are three discharge insulators 14, which are evenly arranged in the same horizontal plane.

[0020] The transmission rod 24 and the adjusting rotating rod 18 are both fixed to the bottom of the base by the connector 23.

[0021] A scale is arranged in the adjusting box 19 for measuring the adjusting distance between the upper and lower electrodes.

[0022] An observation window 25 is also arranged in the adjusting box 19.

[0023] The base is fixed on the support column 26, and the support column is fixed on the ground.

[0024] If the distance between the two electrodes is changed, it is only needed to adjust by the manual or electric driving device arranged in the adjusting box 19 under the column. The specific adjusting method is that the adjusting rotating rod II 18 is rotated by the output shaft through the manual or electric operation (remote control) arranged in the adjusting box 19 under the column, and then the upper part of the conductive and adjusting rotating rod I 17 arranged in the support pipe 16 is pushed to move the conductive and lifting rod 20 and the lower electrode 13 fixed thereon up and down, so as to change the distance between the upper and lower electrodes, and the parameter value is read out through the scale arranged in the electric / manual mechanism adjusting box 19.

[0025] If the air parameters such as temperature, humidity and pressure in the transformer substation are changed, it will directly affect the size of the protection parameter. In order to make the protection parameter always in the stable value, the automatic control device is arranged in the adjusting box 19, and the above-mentioned parameters are fed back to the automatic control device in real time by the respective sensors, the automatic control device determines the matching value between the size of the protection gap and the protection parameter through calculation, and then sends the instruction to control the motor to automatically adjust to the corresponding parameter.

Claims

1. A discharge gap down adjustable transformer neutral grounding device, comprising a surge arrester, a current transformer, characterized in that: The upper end of the conductive rod and hanger is fixedly connected with the upper grounding static contact, and the lower end of the insulator column is fixed on the base, and the base is further provided with a reversing mechanism, the reversing mechanism is connected with the lower end of the grounding knife arm, and the upper end of the grounding knife arm is provided with a grounding moving contact; The lower end of the conductive rod and hanger is provided with an upper discharge electrode, the upper discharge electrode is arranged on the upper mounting plate of the insulating support assembly, the lower mounting plate of the insulating support assembly is fixed on the support pipe, the adjusting rotating rod one, the adjusting rotating rod two and the conductive and lifting rod are arranged in the support pipe, the upper end of the conductive and lifting rod is fixed with a lower discharge electrode, the lower end of the conductive and lifting rod is provided with an internal thread, the upper end of the adjusting rotating rod one is provided with a threaded end rod, the adjusting rotating rod one passes through the current transformer and is connected with the adjusting rotating rod two, the adjusting rotating rod two is connected with the manual or electric drive device in the adjusting box, when the manual or electric drive device in the adjusting box drives the adjusting rotating rod two to rotate, the adjusting rotating rod one arranged in the support pipe is driven to rotate through the connecting head, the upper end of the adjusting rotating rod one is provided with a threaded end rod, and the conductive and lifting rod is driven to move up and down, so that the distance between the discharge electrodes is adjusted; The upper end of the conductive and lifting rod is provided with a through long slot hole, the anti-rotation column pin passes through the circular hole on the support pipe and the long slot hole on the conductive and lifting rod in the support pipe, so that the conductive and lifting rod can only move up and down in the support pipe and cannot rotate, and the support pipe is fixed on the base. The reversing mechanism comprises an upper reversing bevel gear fixed with the grounding knife arm and a lower reversing bevel gear connected with the upper end of the transmission rod, the lower end of the transmission rod is connected with the manual or electric drive device in the adjusting box. The discharge insulator is arranged between the upper mounting plate and the lower mounting plate. The discharge insulator is three, and is uniformly arranged at 120° in the same horizontal plane.

2. A discharge gap column down adjustable transformer neutral grounding device according to claim 1, characterized in that: The transmission rod and the adjusting rotating rod two are fixed below the base by the connecting head.

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