CN210720556U

CN210720556U - Be applicable to carbon brush current measurement device

Info

Publication number: CN210720556U
Application number: CN201921683889.2U
Authority: CN
Inventors: 王晓瑜; 王晶超
Original assignee: Harbin Electric Machinery Co Ltd
Current assignee: Harbin Electric Machinery Co Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-06-09
Anticipated expiration: 2029-10-10

Abstract

The utility model discloses a current measuring device suitable for a carbon brush, which comprises a display touch screen, an intelligent control unit, a power input port, a signal output port, a signal input module, a four-core shielding signal cable, an open type Hall current sensor and a locking bolt; the utility model discloses can realize the on-line monitoring to generator carbon brush electric current, adopt open type hall sensor technique, can directly pass the brush braid and carry out the carbon brush current measurement, need not to change carbon brush body structure, the installation is simple and convenient with the maintenance, convert measuring signal into the signal that can be directly gathered and received by the secondary instrument through integrated chip, the commonality is strong, can show the situation of change of each way carbon brush electric current on the display touch screen in real time, have the transfinite warning, data storage and inquiry, functions such as fault incident record, through monitoring and analysis to carbon brush electric current, can prevent effectively because of the too big unit accident that arouses of carbon brush electric current.

Description

Be applicable to carbon brush current measurement device

The technical field is as follows:

the utility model relates to a hydraulic generator field especially relates to a be applicable to carbon brush current measurement device.

Background art:

in the running process of the water turbine generator set, the carbon brush and the collecting ring form a sliding conductive structure, excitation current is transmitted to a generator rotor winding, the generator is helped to send out reactive power, under the normal condition, the carbon brush is well contacted with the collecting ring, the current of the carbon brush is distributed relatively evenly, but when the carbon brush is jammed in a brush holder or the abrasion degrees of different carbon brushes are different greatly, the contact area of the carbon brush and the collecting ring can be changed, so that the current is distributed integrally and is unbalanced, the current of part of the carbon brush is increased, the temperature of the carbon brush is increased sharply, the braid is burnt off, the collecting ring is burnt off, and serious faults of the generator set occur. Therefore, the current monitoring of the carbon brush can discover the carbon brush which abnormally works as early as possible, maintenance and treatment are carried out in time, and the safe operation of the unit is ensured. At present, closed current transformers are adopted for current measurement of carbon brushes of existing hydropower stations, the structure of a carbon brush body needs to be changed when the closed current transformers are installed, installation is complex and difficult, later maintenance cost is high, due to the fact that installation space is limited and carbon brush structures of units of different manufacturers are different, the current transformers need to be specially customized, measurement signals output by the current transformers are unconventional signals, a plurality of secondary instruments cannot directly collect and apply the measurement signals, universality is not achieved, and great difficulty is brought to measurement of carbon brush current. In view of this, need to develop one kind and need not to change carbon brush body structure, installation and maintenance are simple and convenient, and output signal can be directly used by the secondary instrument, and the commonality is strong, but real-time supervision and the measuring device who shows every carbon brush electric current, can accurate analysis each carbon brush electric current's the change condition through the monitoring to carbon brush electric current signal, discovery problem in advance avoids taking place serious trouble, guarantees unit safe and reliable operation.

The invention content is as follows:

the utility model aims at developing one kind and need not to change carbon brush body structure, the installation is simple and convenient with the maintenance, and output signal can be directly used by the secondary instrument, and the commonality is strong, can every carbon brush electric current of real-time supervision and timely early warning, carries out the carbon brush current measuring device of record and memory function to the alarm incident. The technical scheme of the utility model is that: the intelligent control device is characterized by comprising a display touch screen (1), an intelligent control unit (2), a power input port (3), a signal output port (4), a signal input module (5), a four-core shielding signal cable (6), an open type Hall current sensor (7) and a locking bolt (8), wherein the brush braid (10) is welded and pressed on a carbon brush (9), the open type Hall current sensor (7) penetrates through the brush braid (10) and is tightened through the locking bolt (8), the display touch screen (1) is positioned on a panel of the carbon brush current measuring device, the intelligent control unit (2) is positioned inside the carbon brush current measuring device, the power input port (3), the signal output port (4) and the signal input module (5) are arranged on a back plate of the carbon brush current measuring device in a screw terminal block mode, the display touch screen (1), the power input port (3) and the signal output port (4) are arranged on the back plate of the, The signal input module (5) is connected to the intelligent control unit (2) through a flat cable in an inserting mode, and the open type Hall current sensor (7) is connected with the signal input module (5) through a four-core shielding signal cable (6).

The utility model has the advantages that:

1. the open type Hall current transformer can directly penetrate through the brush braid for installation without changing the structure of the carbon brush body, and is small in size and simple and convenient to install and maintain;

2. the integrated chip is adopted to convert the measurement signal into a signal which can be directly collected and received by the secondary instrument, so that the universality is strong;

3. the current value of each carbon brush can be monitored in real time on line, and the current overrun alarming function is realized;

4. the system has the functions of data storage and fault alarm recording, and is convenient for query, call and fault analysis.

Description of the drawings:

FIG. 1 is a front view of the carbon brush current measuring device

FIG. 2 is a rear view of the carbon brush current measuring device

FIG. 3 is a schematic view showing the installation of the current measuring device of the carbon brush

The specific implementation mode is as follows:

as shown in fig. 1 to 2, the utility model relates to a be applicable to carbon brush current measuring device, it comprises display touch screen 1, intelligent control unit 2, power input port 3, signal output port 4, signal input module 5, four-core shielding signal cable 6, open type hall current sensor 7, locking bolt 8.

As shown in fig. 3, the carbon brush 9 is in close contact with the collecting ring, the shunt 10 is welded and pressed on the carbon brush 9, and the open hall current sensor 7 is inserted through the shunt 10 and tightened by the locking bolt.

The power input port 3 provides a working power supply for the carbon brush current measuring device, and after the carbon brush current measuring device is connected with the working power supply, the display touch screen 1 is lightened; the open type Hall current sensor 7 accesses the signal thereof to the signal input module 5 through the four-core shielding signal cable 6, and the signal input module 5 sends the external input signal to the intelligent control unit 2; the intelligent control unit 2 analyzes and processes the sent carbon brush current signal, and displays information such as a current value, an alarm record, a historical data curve and the like of the carbon brush on the display touch screen 1; the intelligent control unit 2 can convert the analyzed and processed data into various forms such as voltage signals or current signals and the like, and the data are transmitted to a secondary instrument or a remote monitoring system through the signal output port 4, so that the current of the carbon brush can be monitored in real time; meanwhile, the carbon brush current measuring device also has the functions of overrun alarm, data storage and query, fault event record and the like, and can be used for calling and querying data.

Claims

1. The utility model provides a be applicable to carbon brush current measuring device, characterized by: the intelligent control device is characterized by comprising a display touch screen (1), an intelligent control unit (2), a power input port (3), a signal output port (4), a signal input module (5), a four-core shielding signal cable (6), an open type Hall current sensor (7) and a locking bolt (8), wherein the brush braid (10) is welded and pressed on a carbon brush (9), the open type Hall current sensor (7) penetrates through the brush braid (10) and is tightened through the locking bolt (8), the display touch screen (1) is positioned on a panel of the carbon brush current measuring device, the intelligent control unit (2) is positioned inside the carbon brush current measuring device, the power input port (3), the signal output port (4) and the signal input module (5) are arranged on a back plate of the carbon brush current measuring device in a screw terminal block mode, the display touch screen (1), the power input port (3) and the signal output port (4) are arranged on the back plate of the, The signal input module (5) is connected to the intelligent control unit (2) through a flat cable in an inserting mode, and the open type Hall current sensor (7) is connected with the signal input module (5) through a four-core shielding signal cable (6).