CN220106236U - Complete set of neutral point protection device - Google Patents

Abstract

The utility model discloses a complete neutral point protection device, which relates to the technical field of power protection devices and comprises a fixed base and a current transformer, a lightning arrester and an isolating switch which are sequentially arranged on the fixed base from left to right, wherein an installation table is fixedly arranged on the fixed base, a position adjusting cavity is arranged at the top of the installation table, the current transformer is arranged on the installation table, a connecting plate is arranged on the current transformer, a first discharging gap rod is arranged on the connecting plate, a wiring end plate is arranged at the top of the lightning arrester, a second discharging gap rod is arranged on the wiring end plate, a discharging gap is arranged between the first discharging gap rod and the second discharging gap rod, and the lightning arrester is connected with the top end of the isolating switch. The utility model adopts the complete set of neutral point protection device with the structure, can realize the conversion of two different operation modes of the neutral point protection device of the transformer, avoid the damage of system faults or lightning overvoltage to the transformer, and can simply and conveniently adjust the size of the discharge gap.

Description

Complete set of neutral point protection device

Technical Field

The utility model relates to the technical field of power protection devices, in particular to a complete neutral point protection device.

Background

The complete set of neutral point protection device is widely applied to transformers, is one of main equipment in high-voltage power transmission and transformation equipment, is mainly used for protecting the neutral point of the transformer when lightning overvoltage, operation overvoltage and temporary overvoltage occur, and plays an important role in a power system.

At present, in the field of high-voltage switch equipment, the development and the application of intelligent energy-type circuit breakers and GIS equipment are mainly focused in China, but in the field of complete protection devices for neutral points of transformers, a traditional product structure is still adopted, and most of transformers are in graded insulation in the operation mode of the traditional product structure, so that overvoltage is a great threat to the insulation of neutral points, and a protection device is required to be arranged for the neutral points to prevent accidents.

Disclosure of Invention

The utility model aims to provide a complete neutral point protection device, which solves the problem of neutral point overvoltage caused by lightning stroke and single-phase grounding short circuit fault.

In order to achieve the above purpose, the utility model provides a complete neutral point protection device, which comprises a fixed base, wherein a current transformer, a lightning arrester and a disconnecting switch are sequentially arranged on the fixed base from left to right, an installation table is fixedly arranged on the fixed base, the current transformer is installed on the installation table, two connecting plates are arranged on the current transformer, a first discharge gap rod is installed on each connecting plate, a wiring end plate is arranged at the top of the lightning arrester, a second discharge gap rod is installed on each wiring end plate, a discharge gap is arranged between the first discharge gap rod and the second discharge gap rod, and the lightning arrester is connected with the top end of the disconnecting switch.

Preferably, the top of mount table is provided with the position control chamber, one side in position control chamber is provided with the rocker, the symmetry is provided with bearing one and bearing two on the left and right sides wall in position control chamber, bearing one with be provided with the threaded rod between the bearing two, the one end of rocker passes the left side wall in position control chamber with the threaded rod is connected.

Preferably, a sliding block nut is correspondingly arranged on the threaded rod, and the top of the sliding block nut is connected with the bottom of the current transformer.

Preferably, an insulator is arranged at the top of the isolating switch.

Preferably, the isolating switch is of a V-shaped double-column rotary structure.

Preferably, the free ends of the first discharge gap rod and the second discharge gap rod are respectively provided with an alloy contact.

Preferably, the first discharge gap rod and the second discharge gap rod are arranged at the same horizontal height.

Therefore, the neutral point complete protection device adopting the structure of the utility model comprises the following components

The beneficial effects are that:

(1) Through the parallel arrangement of the discharge gap and the lightning arrester, the conversion of two different operation modes of the transformer neutral point protection device can be realized, and the damage to the transformer caused by the rise of the transformer neutral point voltage due to system faults or lightning overvoltage is avoided.

(2) The size of the discharge gap can be simply and conveniently adjusted by the arrangement of the position adjusting cavity.

The technical scheme of the utility model is further described in detail through the drawings and the embodiments.

Drawings

FIG. 1 is a schematic view of an embodiment of a neutral point protector set according to the present utility model;

fig. 2 is a side view of an embodiment of a neutral point complete protector according to the present utility model.

In the figure: 1. a fixed base; 2. a current transformer; 3. a connecting plate; 4. a first discharge gap bar; 5. a lightning arrester; 6. an isolating switch; 7. a terminal plate; 8. a second discharge gap bar; 9. a discharge gap; 10. alloy contacts; 11. an insulator; 12. a mounting table; 13. a position adjustment chamber; 14. a rocker; 15. a first bearing; 16. a second bearing; 17. a threaded rod; 18. a slider nut.

Detailed Description

The technical scheme of the utility model is further described below through the attached drawings and the embodiments.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

Examples

The utility model provides a neutral point complete set protection device, as shown in fig. 1-2, including unable adjustment base 1, unable adjustment base 1 is last to have set gradually current transformer 2 from left to right, arrester 5 and isolator 6, unable adjustment base 1 is last to be fixedly provided with mount table 12, current transformer 2 installs on mount table 12, the top of mount table 12 is provided with position control chamber 13, one side of position control chamber 13 is provided with rocker 14, the symmetry is provided with bearing one 15 and bearing two 16 on the left and right sides wall of position control chamber 13, be provided with threaded rod 17 between bearing one 15 and the bearing two 16, the left side wall that the one end of rocker 14 passed position control chamber 13 is connected with threaded rod 17. The threaded rod 17 is correspondingly provided with a sliding block nut 18, and the top of the sliding block nut 18 is connected with the bottom of the current transformer 2. The current transformer 2 is provided with two connecting plates 3, a first discharge gap rod 4 is arranged on the connecting plates 3, the top of the lightning arrester 5 is provided with a wiring end plate 7, a second discharge gap rod 8 is arranged on the wiring end plate 7, the first discharge gap rod 4 and the second discharge gap rod 8 are arranged at the same horizontal height, a discharge gap 9 is arranged between the first discharge gap rod 4 and the second discharge gap rod 8, and alloy contacts 10 are arranged at the free ends of the first discharge gap rod 4 and the second discharge gap rod 8. The lightning arrester 5 is connected with the top of isolator 6, and isolator 6 is V type double column rotary structure, and isolator 6's top is provided with insulator 11.

When the system works, the current transformer 2 and the discharge gap 9 are connected in series, a parallel circuit can be formed between the discharge gap 9 and the lightning arrester 5, and when a single-phase grounding fault or switching single-phase reclosing occurs in the system, the discharge gap 9 does not need to perform discharge action. The discharge gap 9 acts when the system is lost to ground and a system non-full phase operation or resonance failure occurs. When lightning overvoltage action occurs, the lightning arrester 5 acts, and the discharge gap 9 does not act; when the internal overvoltage acts, the lightning arrester 5 does not act, and the gap acts, so that the overvoltage protection is performed on the transformer. When the isolating switch 6 is opened, the two moving contacts synchronously act, so that the high synchronism is realized.

The current transformer 2 is arranged on the mounting table 12, a position adjusting cavity 13 is arranged on the mounting table 12, a screw rod and a sliding block nut 18 are arranged in the position adjusting cavity 13, the bottom of the main body of the current transformer 2 is connected with the sliding block nut 18, and one end of the screw rod is connected with a rocker 14. The rocker 14 is rocked to drive the screw rod to rotate, the sliding block nut 18 on the screw rod can drive the current transformer 2 to move in the chute along with the screw rod, the position of the first discharge gap rod 4 on the current transformer 2 also translates along with the current transformer, and finally, the size of the discharge gap 9 is adjusted, so that the operation is simple and convenient, and the adjustment is accurate.

Therefore, the utility model adopts the complete set of neutral point protection device with the structure, and can realize the conversion of two different operation modes of the neutral point protection device of the transformer through the discharge gap and the lightning arrester which are arranged in parallel, thereby avoiding the damage to the transformer caused by the rise of the neutral point voltage of the transformer due to the system fault or the overvoltage of lightning. The size of the discharge gap can be simply and conveniently adjusted by the arrangement of the position adjusting cavity.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting it, and although the present utility model has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the utility model can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the utility model.

Claims (5)

1. The utility model provides a neutral point complete sets protection device, includes unable adjustment base, its characterized in that: the lightning arrester is characterized in that a current transformer, a lightning arrester and an isolating switch are sequentially arranged on the fixed base from left to right, an installation table is fixedly arranged on the fixed base, a position adjusting cavity is arranged at the top of the installation table, a rocker is arranged on one side of the position adjusting cavity, a first bearing and a second bearing are symmetrically arranged on the left side wall and the right side wall of the position adjusting cavity, a threaded rod is arranged between the first bearing and the second bearing, one end of the rocker penetrates through the left side wall of the position adjusting cavity and is connected with the threaded rod, a sliding block nut is correspondingly arranged on the threaded rod, the top of the sliding block nut is connected with the bottom of the current transformer, two connecting plates are arranged on the current transformer, a first discharge gap rod is arranged on the connecting plates, a second discharge gap rod is arranged on the connecting plates, a discharge gap is arranged between the first discharge gap rod and the second discharge gap rod, and the top of the isolating switch is connected.

2. A neutral point complete protector according to claim 1, characterized in that: and an insulator is arranged at the top of the isolating switch.

3. A neutral point complete protector according to claim 2, characterized in that: the isolating switch is of a V-shaped double-column rotary structure.

4. A neutral point complete protector according to claim 3, characterized in that: and the free ends of the first discharge gap rod and the second discharge gap rod are respectively provided with an alloy contact.

5. The neutral point complete protector as set forth in claim 4, wherein: the first discharge gap rod and the second discharge gap rod are arranged at the same horizontal height.