CN213122080U - Novel generator spindle current monitoring device - Google Patents

Abstract

The utility model discloses a novel generator main shaft current monitoring device, which consists of an LED display module, an isolation amplifying unit, an input module, an output module, a core controller, a power module, a Hall current transformer, a signal shielding cable, a fastening bolt, a grounding carbon brush, a brush braid and an installation support; the utility model discloses can realize the on-line monitoring to generator main shaft electric current, utilize the principle that flows through ground connection carbon brush electric current and main shaft electric current and equal, through measuring ground connection carbon brush electric current, realize the monitoring to generator main shaft electric current, exciting current interference can be avoided, it is accurate to measure, moreover, the steam generator is simple in structure, small, the installation is maintained portably, output signal can be directly gathered, the commonality is strong, have the warning, data storage, the inquiry, functions such as fault record, can effectively avoid leading to bearing insulation breakdown because of main shaft electric current is too big, the occurence of failure such as unit part damage.

Description

Novel generator spindle current monitoring device

Technical Field

The utility model relates to a hydraulic generator field especially relates to a novel generator spindle current monitoring device.

Background

In the running process of the water turbine generator set, a generator main shaft in a strong magnetic field can generate certain induced potential. Under normal conditions, the main shaft and the ground are in an open circuit state, no current exists, along with the long-term operation of the generator, the insulation strength is reduced due to the abrasion of a bearing and the like, a loop is formed between the main shaft and the ground, and the current is generated; along with the decline of dielectric strength gradually, main shaft current can increase gradually, when the main shaft current increases to certain degree, can cause the bearing to burn out, causes generator damage etc. serious accident. If the current of the main shaft can be monitored in real time, the problem can be found in time, and the main shaft can be maintained, the occurrence of major accidents can be avoided. At present, most power stations adopt a mode of mounting a split current transformer on a main shaft at a lower rack of a generator to measure the current of the main shaft, and the current transformer of the measuring device has the same diameter as the main shaft, large size, complex mounting and difficult daily maintenance and overhaul; due to the limitation of the installation position, the current transformer is easily interfered by the exciting current, so that the measured value jumps, and the actual value of the main shaft current cannot be accurately reflected. In view of this, need to develop one kind and can be anti-interference, measure accurate, simple structure, small in size, the installation with maintain portably, can carry out real-time supervision and the device that shows to generator main shaft current, through the monitoring and the analysis to main shaft current, discover the problem in advance, avoid taking place serious accident, guarantee unit safe and reliable operation.

Disclosure of Invention

The utility model aims at developing a monitoring devices that can be anti-interference, measure accurately, simple structure, small in size, the installation is simple and convenient with the maintenance, but real-time supervision generator main shaft electric current. The technical scheme of the utility model is that: the LED display device is composed of an LED display module (1), an isolation amplifying unit (2), an input module (3), an output module (4), a core controller (5), a power module (6), a Hall current transformer (7), a signal shielding cable (8), a fastening bolt (9), an earthing carbon brush (10), a brush braid (11), a mounting bracket (12), a back plate (13) and a front panel (14), wherein the brush braid (11) is welded and pressed on the earthing carbon brush (10), the Hall current transformer (7) penetrates through the brush braid (11) and then is tightened through the fastening bolt (9), the earthing carbon brush (10) is fixed on the mounting bracket (12) in a welding mode, the distance between the mounting bracket (12) and a generator main shaft (15) is adjusted, so that the earthing carbon brush (10) is fully contacted with the surface of the generator main shaft (15), the LED display module (1) is positioned on the front panel (14), keep apart amplification unit (2) and core control ware (5) and inlay in current monitoring device's inside, input module (3), output module (4) and power module (6) are installed on backplate (13) with the form of screw terminal piece, input module (3) are plugged in through the winding displacement and are kept apart on amplification unit (2), LED display module (1), keep apart amplification unit (2), output module (4), power module (6) are plugged in on core control ware (5) through the winding displacement, hall current transformer (7) link to each other with input module (3) through signal shielded cable (8).

The utility model has the advantages that:

1. by using the principle that the current flowing through the grounding carbon brush is equal to the current of the main shaft, the current of the main shaft of the generator is monitored by measuring the current of the grounding carbon brush, so that the interference of exciting current can be avoided, and the measurement is accurate;

2. the Hall current transformer is adopted, so that the size is small, and the installation and maintenance are simple and convenient;

3. the core controller converts the measurement signal into a signal which can be directly collected and received by the secondary instrument, so that the universality is strong;

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

Drawings

FIG. 1 is a front view of the main shaft current monitoring device of the generator

FIG. 2 is a schematic structural view of the main shaft current monitoring device of the generator

Detailed Description

As shown in fig. 1 and 2, the utility model relates to a novel generator spindle current monitoring device, it comprises LED display module 1, isolation amplifying unit 2, input module 3, output module 4, core controller 5, power module 6, hall current transformer 7, signal shielded cable 8, fastening bolt 9, ground connection carbon brush 10, brush pigtail 11, installing support 12, backplate 13, front panel 14.

The brush braid 11 is welded and pressed on the grounding carbon brush 10, the Hall current transformer 7 is fastened through the fastening bolt 9 after penetrating through the brush braid 11, the grounding carbon brush 10 is fixed on the mounting bracket 12 in a welding mode, the distance between the mounting bracket 12 and the generator main shaft 15 is adjusted, the grounding carbon brush 10 is in full contact with the surface of the generator main shaft 15, and then the mounting bracket 12 is welded and fixed.

The power module 6 provides a working power supply for the generator main shaft current monitoring device; the Hall current transformer 7 is connected to the input module 3 through a signal shielding cable 8, the input module 3 sends an external input signal to the isolation amplifying unit 2 for filtering and amplifying, and then the signal is sent to the core controller 5, the core controller 5 analyzes and processes the signal, and displays information such as a spindle current value, an alarm record, a historical data curve and the like on the LED display module 1; the core controller 5 can convert the analyzed and processed data into standard voltage or current signals, and the standard voltage or current signals are transmitted to a secondary instrument or an upper computer system through the output module 4, so that the real-time monitoring of the spindle current is realized.

Claims (1)

1. The utility model provides a novel generator main shaft current monitoring device which characterized by: the LED display device is composed of an LED display module (1), an isolation amplifying unit (2), an input module (3), an output module (4), a core controller (5), a power module (6), a Hall current transformer (7), a signal shielding cable (8), a fastening bolt (9), an earthing carbon brush (10), a brush braid (11), a mounting bracket (12), a back plate (13) and a front panel (14), wherein the brush braid (11) is welded and pressed on the earthing carbon brush (10), the Hall current transformer (7) penetrates through the brush braid (11) and then is tightened through the fastening bolt (9), the earthing carbon brush (10) is fixed on the mounting bracket (12) in a welding mode, the distance between the mounting bracket (12) and a generator main shaft (15) is adjusted, so that the earthing carbon brush (10) is fully contacted with the surface of the generator main shaft (15), the LED display module (1) is positioned on the front panel (14), keep apart amplification unit (2) and core control ware (5) and inlay in current monitoring device's inside, input module (3), output module (4) and power module (6) are installed on backplate (13) with the form of screw terminal piece, input module (3) are plugged in through the winding displacement and are kept apart on amplification unit (2), LED display module (1), keep apart amplification unit (2), output module (4), power module (6) are plugged in on core control ware (5) through the winding displacement, hall current transformer (7) link to each other with input module (3) through signal shielded cable (8).

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