Line differential protection method capable of adapting by-path running status automatically
An operating state, line differential technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of no optical fiber current differential protection, hidden dangers of safe operation of power system transmission lines, and inability of optical fiber channels to switch online. The effect of safety and reliability
Active Publication Date: 2010-10-13
CHINA SOUTHERN POWER GRID COMPANY +1
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When the switch on one side of the line needs to be overhauled, the line on this side needs to be switched to the operation of the bypass circuit breaker. Since the optical fiber channel cannot be switched online, the optical fiber current differential protection must be out of operation in this case, so that in this case The line does not have optical fiber current differential protection, which brings hidden dangers to the safe operation of power system transmission lines
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
[0018] The present invention will be described in further detail below in conjunction with accompanying drawing and example.
[0019] Such as figure 1 Shown is a schematic diagram of current differential protection with bypass bus operation mode. This drawing only draws circuit breakers and knife switches related to the identification of bypass operation status, and omits others to avoid too many knife circuit breakers in the figure, causing Inconvenient to read and describe. The present invention discloses a line differential protection method that automatically adapts to the operating state of the bypass. The differential protection method identifies the line according to the closing position of the circuit breaker on the local side, the closing position of the bypass circuit breaker on the local side, and the position of the bypass knife switch. state, and according to the state of the line, select the corresponding current to participate in the calculation of the differen...
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 discloses a line differential protection method capable of automatically adapting to bypass state. The method determines running state of the line according to an on position of a line breaker, the on position of a bypass breaker and the position of a knife switch, selects the corresponding current as the current of the line current differential protection according to the running state of the line, and trips off the corresponding breaker according to the running state of the line to clear the fault when the differential protection works. The method can automatically identify the state of the line, avoids the problem of the protection quitting of the current differential protection of the traditional optical fiber while switching to the bypass running state, thus improving the security and reliability of power transmission lines of an electric power system.
Description
technical field [0001] The invention belongs to the field of electric system relay protection and automation technology, and in particular relates to a line differential protection method. Background technique [0002] The correct action of transmission line relay protection equipment plays a vital role in improving the stability of the power system and the reliability of power supply. Current differential protection is the main protection method for power system transmission lines. Optical fiber current differential protection is the main implementation method of line current differential protection. Optical fiber current differential protection is evolved on the basis of current differential protection. The protection principle is based on Kirchhoff's current law, and optical fiber current differential protection is a relay protection method widely used in power system transmission lines in my country. [0003] For line current differential protection, the current informat...
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 Patents(China)
IPC IPC(8): H02H7/26
Inventor 刘映尚谌军周红阳陈朝晖王莉韩卫民姚斌王斌
Owner CHINA SOUTHERN POWER GRID COMPANY