CN217385629U

CN217385629U - Shaft current sensing device

Info

Publication number: CN217385629U
Application number: CN202220598695.8U
Authority: CN
Inventors: 李峰; 吴凯; 王晓刚; 刘文广; 李扬
Original assignee: Harbin Hakong Industry Co ltd
Current assignee: Harbin Hakong Industry Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-09-06
Anticipated expiration: 2032-03-18

Abstract

A shaft current sensing device relates to the field of shaft current monitoring of generators. When operating (including turbo generator) to current hydraulic generator (different because of air gap magnetic resistance between stator, the rotor), magnetic field distribution is complicated, arouses that the magnetic flux is uneven, so produces the axle current in the macroaxis of generator, leads to the lubricating oil quality variation to probably burn the problem that the axle bush caused the accident, the utility model provides an axle current sensing device, it is concrete: the shaft current sensing device includes: the winding structure comprises an iron core module, a winding module and a shell; the iron core module is annular, the winding module is wound on the iron core module, and the shell is annular and arranged on the outer side of the iron core module and used for fixing the iron core module and the winding module; the cross section of the shell is C-shaped, and the opening faces the inner side of the shell. Axle current sensing device be applicable to and detect among the hydroelectric set the technical field to the electric current of main shaft.

Description

Shaft current sensing device

Technical Field

Relate to the generator shaft current monitoring field, concretely relates to monitoring of shaft current in the big axle of hydroelectric generating set.

Background

When the hydraulic generator operates (including a turbine generator), because air gap magnetic resistance between a stator and a rotor is different, magnetic field distribution is complex, magnetic flux imbalance is caused, and therefore shaft current is generated in a large shaft of the generator. It will cause the lubricating oil to become poor and may burn the bearing bush to cause accidents. In addition, in the operation process, the load current contains oil harmonic components due to the nonlinearity of the transformer load, and the measurement result is greatly interfered.

The traditional detection device adopts a group of windings for measurement, and the accuracy and the anti-interference performance of the traditional detection device are easily influenced by the field working condition.

Disclosure of Invention

When operating (including turbo generator) to current hydraulic generator (different because of air gap magnetic resistance between stator, the rotor), magnetic field distribution is complicated, arouses that the magnetic flux is uneven, so produces the axle current in the macroaxis of generator, leads to the lubricating oil quality variation to probably burn the problem that the axle bush caused the accident, the utility model provides an axle current sensing device, it is concrete:

a shaft current sensing device, said device comprising: the winding structure comprises an iron core module, a winding module and a shell; the iron core module is annular, the winding module is wound on the iron core module, and the shell is annular and arranged on the outer side of the iron core module and used for fixing the iron core module and the winding module; the cross section of the shell is C-shaped, and the opening faces the inner side of the shell.

Further, the winding module comprises two windings: a working winding and a compensation winding; the working winding is wound on the iron core module, and the compensation winding is wound on the outer side of the working winding.

Furthermore, the iron core module is formed by combining two sections of semi-annular iron cores.

Furthermore, the working winding is divided into two parts which are uniformly distributed and respectively arranged on the two sections of semi-annular iron cores.

Further, the device further comprises: and the connecting plates are used for connecting winding connecting contacts of the working winding and the compensation winding, and one connecting plate is respectively fixed on two end faces of each semi-annular iron core.

Further, the iron core is made of silicon steel.

Preferably, the iron core is formed by stacking 60 layers of silicon steel sheets.

Preferably, the device further comprises: and the epoxy resin structure layer is wrapped on the outer sides of the iron core and the winding.

Further, the device further comprises: the support frame, the support frame be the h type, fix the outside of casing.

Preferably, the material of the shell is steel.

The utility model discloses an useful part lies in:

produce the axle current in the main shaft of generator when moving to current hydraulic generator, lead to lubricating oil quality variation to the axle bush that probably burns causes the problem of accident, the utility model discloses use the electromagnetic induction principle to provide the axle current sensing device who comprises non-magnetic iron core and winding as the basis for the real-time status of monitoring generator axle current when moving, in order to reach the purpose of protection generator main shaft.

The shaft current sensing device provided by the utility model adopts a feed-through non-contact measurement mode, so that the sensor is not in contact with the measured large shaft, and has no mechanical contact, thereby realizing the effective electrical isolation between the sensing device and the large shaft;

the secondary winding of the sensor is between 500-.

Adopt C shape casing, casing opening is towards the macroaxis direction, when guaranteeing monitoring capability, effectively isolated external disturbance to for sensing device provides the protection.

The iron core is formed by combining two semi-rings, can be respectively clamped at two sides of the large shaft and then is butted together, and the installation is convenient.

To at the operation in-process, make load current oiliness harmonic composition because of the nonlinearity of mutual-inductor load, have the problem of very big interference to measuring result, the utility model provides an axle current sensing device adopts two windings, compensation winding of a work winding, and compensation winding mainly provides the route for the third harmonic current, eliminates the third harmonic magnetic flux, can guarantee measuring accuracy and interference immunity.

The iron core and the winding are wrapped by epoxy resin, so that the structures of the iron core and the shell are more stable, and the inner side of the iron core exposed outside is protected.

The device is suitable for detecting the current of the middle and large shaft of the water turbine generator set.

Drawings

Fig. 1 is a plan view of a shaft current sensor device according to the first embodiment.

Fig. 2 is a cross-sectional view of an axial current sensing apparatus according to the ninth embodiment.

Fig. 3 is a schematic view of a state in which the connecting plate according to the fifth embodiment is attached to an end face of an iron core.

Fig. 4 is a schematic view of a state in which the shaft current sensor according to the ninth embodiment is mounted on a large shaft.

In the drawings, 1 denotes an iron core module, 2 denotes a winding module, 3 denotes an epoxy resin structure layer, 4 denotes a case, 5 denotes a support frame, 6 denotes a connection plate, and 7 denotes a large shaft.

Detailed Description

In order to make the advantages and benefits of the technical solutions provided by the present invention more specifically expressed, the technical solutions provided by the present invention are now described in further detail with reference to the accompanying drawings, specifically:

first embodiment, the present embodiment is described with reference to fig. 1 to 4, and the present embodiment provides an axial current sensing apparatus including: an iron core module, a winding module, and a housing; the iron core module is annular, the winding module is wound on the iron core module, and the shell is annular and arranged on the outer side of the iron core module and used for fixing the iron core module and the winding module; the cross section of the shell is C-shaped, and the opening faces the inner side of the shell.

In this embodiment, the cross-section of casing be the C type, casing opening is towards the major axis direction, when guaranteeing monitoring capability, effective isolated external disturbance to for sensing device provides the protection.

In a second aspect of the present invention, there is provided the shaft current sensing device according to the first aspect, wherein the winding module includes two windings: a working winding and a compensation winding; the working winding is wound on the iron core module, and the compensation winding is wound on the outer side of the working winding.

The winding module is defined in this embodiment to include two windings: the compensation winding mainly provides a passage for third harmonic current, eliminates third harmonic flux and can ensure the accuracy and the anti-interference performance of measurement.

In the third embodiment, the present embodiment is described with reference to fig. 1, and the present embodiment further defines the shaft current sensing device according to the second embodiment, in which the core module is formed by combining two semi-annular cores.

In this embodiment, the iron core module is formed by combining two sections of semi-annular iron cores, and can be respectively clamped at two sides of the large shaft and then butted together, so that the installation is convenient, and debugging is not needed after the installation.

In a fourth embodiment, the present invention further provides the axial current sensing device as defined in the third embodiment, wherein the working winding is divided into two parts, and the two parts are uniformly distributed and respectively disposed on the two sections of the semi-annular iron cores.

In the embodiment, the winding module is uniformly divided into two parts and is respectively arranged on the two sections of semi-annular iron cores.

Fifth embodiment, the present embodiment is described with reference to fig. 3, and the present embodiment is a further limitation of the axial current sensing device according to the fourth embodiment, the axial current sensing device further including: and the connecting plates are used for connecting winding connecting contacts of the working winding and the compensation winding, and one connecting plate is respectively fixed on two end faces of each semi-annular iron core.

In the present embodiment, a connecting plate is fixed on each end surface of the semi-annular iron core for connecting the winding end on the semi-annular iron core to realize the electrical connection between the winding and the outside, as shown in fig. 3, two electrical signal connecting ends are provided on the connecting plate shown in the figure, which are the end of the working winding and the end of the compensation winding respectively. The structure facilitates on-site wiring, and improves the working efficiency and the connection reliability.

In a sixth aspect of the present invention, in the shaft current sensing device according to the first or fifth aspect, the iron core is made of silicon steel.

A seventh embodiment is the axial current sensor device according to the sixth embodiment, wherein the iron core is formed by stacking 60 layers of silicon steel sheets.

Eighth embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment is further limited to the axial current sensing device according to the seventh embodiment, and the axial current sensing device further includes: and the epoxy resin structural layer is wrapped on the outer sides of the iron core module and the winding module.

Ninth, the present embodiment is described with reference to fig. 4, and the present embodiment is further limited to the axial current sensing device according to the first or eighth embodiment, further including: the support frame, the support frame be the h type, fix the outside of casing.

Referring to fig. 4, the supporting frame is h-shaped and used for limiting and fixing the fixed shell, and in practical application, the supporting frame is firstly used for fixing the shell, and then the shell is fixed through jackscrews or bolts.

In a tenth aspect of the present invention, in the eighth aspect, the shaft current sensing device is further defined, and the support frame is made of steel.

The above is to the technical solution provided by the present invention in further detail with several embodiments, in order to highlight the advantages and benefits of the present invention, however, several embodiments above are not used as the right limitation of the present invention, and any combination and equivalent substitution based on the spirit and principle of the present invention are within the scope of the present invention, and the modifications, improvements, embodiments provided by the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A shaft current sensing device, said device comprising: the winding module comprises an iron core module, a winding module and a shell; the iron core module is annular, the winding module is wound on the iron core module, and the shell is annular and arranged on the outer side of the iron core module and used for fixing the iron core module and the winding module; the cross section of the shell is C-shaped, and the opening faces the inner side of the shell.

2. The shaft current sensing device according to claim 1, wherein said winding module comprises two windings: a working winding and a compensation winding; the working winding is wound on the iron core module, and the compensation winding is wound on the outer side of the working winding.

3. The shaft current sensing device according to claim 2, wherein said core module is formed by combining two segments of semi-toroidal cores.

4. The shaft current sensing device according to claim 3, wherein said working winding is divided into two portions, said two portions being uniformly distributed and respectively disposed on the two half-toroidal cores.

5. The shaft current sensing device according to claim 4, further comprising: and the connecting plates are used for connecting winding connecting contacts of the working winding and the compensation winding, and one connecting plate is respectively fixed on two end faces of each semi-annular iron core.

6. A shaft current sensing device according to claim 3 or 5, wherein the material of the core is silicon steel.

7. The shaft current sensing device according to claim 6, wherein said core is laminated with 60 layers of silicon steel sheets.

8. The shaft current sensing device according to claim 7, further comprising: and the epoxy resin structural layer is wrapped on the outer sides of the iron core module and the winding module.

9. The shaft current sensing device according to claim 1 or 8, further comprising: the support frame, the support frame be the h type, the support frame is used for fixing the casing.

10. The shaft current sensing device according to claim 9, wherein said support frame is made of steel.