CN212435538U

CN212435538U - Generator main shaft earthing device

Info

Publication number: CN212435538U
Application number: CN202021457530.6U
Authority: CN
Inventors: 刘轶; 刘盾
Original assignee: Datang Huayin Electric Power Co ltd; Datang Huayin Electric Power Co Ltd Jin Zhushan Thermal Power Generation Branch Co
Current assignee: Datang Huayin Electric Power Co ltd; Datang Huayin Electric Power Co Ltd Jin Zhushan Thermal Power Generation Branch Co
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-01-29
Anticipated expiration: 2030-07-22

Abstract

The utility model provides a generator main shaft earthing device relates to the power generation facility field, installs on the generator end cover. The device comprises a bottom plate and a plurality of grounding devices, wherein the grounding devices are uniformly distributed and fixed on the floor, each grounding device comprises a grounding carbon brush and a brush braid, the grounding carbon brushes are electrically connected with the brush braids, a plurality of mounting holes are formed in the bottom plate, and the mounting holes are positioned among the grounding devices; the device can ensure that the normal operation of a grounding system cannot be influenced when any grounding device is damaged through a plurality of grounding devices, and greatly improves the reliability of grounding; a plurality of grounding devices are installed on the end cover of the generator through the bottom plate, so that the installation is convenient, the maintenance is simple and rapid, the whole structure is simple, the stability is good, and the reliability is high.

Description

Generator main shaft earthing device

Technical Field

The utility model relates to a power generation facility field, concretely relates to generator macroaxis earthing device.

Background

The generator main shaft is grounded: 1. eliminating the electrostatic voltage of the large shaft to the ground: the generator is under the action of magnetic leakage to the large shaft during running, and generates a suspension potential, because the insulation of each bearing in the generator is incomplete, for example, the vertical water turbine is only insulated by a thrust bearing insulating pad, and only oil film gaps less than 1mm exist between other bearings and the large shaft, under the action of the suspension potential, the electric discharge is inevitably carried out on the bearing bush, the electric shock erosion is caused to the bearing bush, and meanwhile, the lubricating oil is degraded to further deteriorate the running environment of the bearing bush; 2. for a rotor ground protection device: if the rotor is in insulation damage and is in short circuit with the rotor, if the rotor is not in the action of the grounding carbon brush, one point of the rotor is difficult to detect and ground, and the interlayer or interphase short circuit caused by multi-point grounding is more difficult to avoid; 3. the voltage of the positive pole and the negative pole of the rotor coil is measured.

The existing generator grounding device has a single grounding mode and only one grounding point, and once the grounding is abnormal, the current discharges slightly to magnetize a large shaft and the current voltage breaks through an oil film, so that the safe operation of a generator set cannot be ensured.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can improve ground connection reliability, simple to operate's generator main shaft earthing device. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a generator large shaft grounding device which is fixed on a generator end cover and comprises a bottom plate and a plurality of grounding devices; wherein:

alternatively or preferably, the plurality of earthing devices are evenly distributed and fixed on the floor.

Optionally or preferably, the grounding device comprises a grounding carbon brush and a braid, and the grounding carbon brush is electrically connected with the braid.

Optionally or preferably, a plurality of mounting holes are formed in the bottom plate, and the mounting holes are located between the plurality of grounding devices.

Alternatively or preferably, the base plate has the same curvature as the generator end cap.

Based on the technical scheme, the following technical effects can be generated:

the embodiment of the utility model provides a pair of generator main shaft earthing device installs on the generator end cover. The utility model discloses a generator main shaft grounding device, through a plurality of grounding devices, can guarantee that the normal operation of the grounding system can not be influenced by any grounding device damage, greatly improve the reliability of grounding; a plurality of grounding devices are arranged on the end cover of the generator through the bottom plate, so that the installation is convenient, and the maintenance is simple and rapid.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a generator large shaft grounding device;

in the figure: 1-a grounded carbon brush; 2-brushing the plait; 3-a bottom plate; 4-mounting holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.

As shown in fig. 1:

the utility model provides a generator macroaxis earthing device fixes on the generator end cover, its characterized in that: comprises a bottom plate 3 and a plurality of grounding devices; wherein:

the plurality of grounding devices are uniformly distributed and fixed on the floor; the grounding device comprises a grounding carbon brush 1 and a brush braid 2, and the grounding carbon brush 1 is electrically connected with the brush braid 2; the bottom plate 3 is provided with a plurality of mounting holes 4, and the mounting holes 4 are positioned among a plurality of grounding devices.

As an alternative embodiment, the mounting holes 4 between the grounding devices are a group of holes, the group of holes includes 4 mounting holes 4, and the 4 mounting holes 4 are distributed in a rectangular array.

As an alternative embodiment, the base plate 3 has the same curvature as the generator end cover.

In an alternative embodiment, the bottom plate 3 is fixedly connected with the generator end cover through a bolt passing through the mounting hole 4.

In an alternative embodiment, the grounding carbon brush 1 and the shunt 2 are fixedly connected to the bottom plate 3 through bolts.

In an alternative embodiment, there are two grounding devices.

Claims

1. The utility model provides a generator macroaxis earthing device, fixes on generator end cover which characterized in that: comprises a bottom plate (3) and a plurality of grounding devices; wherein:

the plurality of grounding devices are uniformly distributed and fixed on the floor; the grounding device comprises a grounding carbon brush (1) and a brush braid (2), and the grounding carbon brush (1) is electrically connected with the brush braid (2); the grounding device is characterized in that a plurality of mounting holes (4) are formed in the bottom plate (3), and the mounting holes (4) are located among the plurality of grounding devices.

2. The generator large shaft grounding device of claim 1, wherein: the bottom plate (3) has the same radian as the end cover of the generator.