Online monitoring device for monitoring power transformer core ground faults and online monitoring method of online monitoring device
A power transformer and iron core grounding technology, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of not being able to timely and accurately detect multi-point grounding faults of transformer iron cores
Active Publication Date: 2014-07-02
STATE GRID CORP OF CHINA +1
View PDF6 Cites 13 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0015] At present, the above detection and search are mainly carried out manually, and the occurrence of multi-point grounding faults in the transformer core cannot be found in time and accurately.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0044] Research and Design of Intelligent On-line Monitoring Device
[0045] 1. CPU hardware design
[0046] The hardware circuit structure is shown in the comprehensive diagram 1. It can be seen from this diagram that the device is separated by a dotted line and consists of an analog part and an intelligent part.
[0047] 1), Hall sampling technology
[0048] figure 1 Outside the dotted line frame is the analog processing part of the transformer core ground current monitoring device. First, the Hall technology HR is used for signal acquisition, such as figure 2 shown.
[0049] exist figure 2 The outline structure and connection mode of the Hall sensor are drawn, among which 1 is the body of the Hall sensor, 2 is the threading hole, 3 is the ground wire to be tested, and 4 is the connecting terminal block, where a is +15V, b is -15V, c is the sampling signal output terminal, d is the common ground, 5 is the fixed orifice plate, and 6 is the zero potential and output sig...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides an online monitoring device for monitoring power transformer core ground faults and an online monitoring method of the online monitoring device. A hall sensor is sequentially in cascade connection with a signal processing circuit, an A / D conversion circuit, a CPU central signal processing system and an alarm circuit, a key is sequentially in cascade connection with an integrated receiving processor and the CPU central signal processing system, an LCD liquid crystal display screen is connected with the CPU central signal processing system, and a collected signal processing circuit is composed of a voltage amplifying circuit and a comparison judgment circuit. The Hall sensor and a direct-current power supply under the voltages of -15V and 15V are adopted, 0V is set to be a comparison judgment value of the comparison judgment circuit, and sampling sensitivity and test accuracy are substantially improved. According to the online monitoring device and method, the power transformer core ground faults can be monitored on line in real time, and the online monitoring device and method have the advantages that the circuits are simple and applicable, and the faults can be found accurately in time.
Description
technical field [0001] The invention relates to a transformer iron core grounding state monitoring device and a monitoring method, in particular to a power transformer iron core multi-point grounding fault online monitoring device and monitoring method. Background technique [0002] Transformer is the main equipment for power transmission, and its performance directly affects the safe operation of the power grid. However, due to load impact, harmonic interference, and aging of equipment itself, it is more common to have multi-point grounding of the iron core. According to statistics, this type of failure rate accounts for more than 30%, so it must be highly valued. [0003] To analyze the source of the grounding of the iron core, it is because there is a dense magnetic flux between the inner coil of the transformer and the iron core, and between the iron core and the fuel tank, and there is a parasitic capacitance. Potential, when the floating potential difference reaches t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 王洪炼
Owner STATE GRID CORP OF CHINA