A full-frequency domain relay protection method and system suitable for ultra-long transmission lines
A transmission line and relay protection technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as inability to adapt to super-long transmission systems, and achieve the effect of ensuring safe operation and avoiding dead zones
Inactive Publication Date: 2018-07-13
XUJI GRP +3
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The purpose of the present invention is to provide a full-frequency domain relay protection method suitable for ultra-long transmission lines to solve the problem that traditional line protection principles and protection configuration schemes cannot meet the needs of ultra-long transmission systems
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
[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0025] Such as figure 1 As shown, the relay protection method provided by the present invention is applicable to the ultra-long power transmission system. For the convenience of description, the ultra-long power transmission system is taken as an example of a representative half-wavelength power transmission system. Of course, the relay protection method is not limited to half-wavelength transmission lines.
[0026] The relay protection system of the half-wavelength transmission line includes an Ethernet communication unit, a sampling unit, a power frequency protection unit, a transient The decision logic unit can be a software module composed of a pure software program, set in a control chip (such as a single-chip microcomputer) or a control device (such as an industrial computer), or it can be a hardware device composed of a corresponding software program ...
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 relates to a full-frequency-domain relay protection method and system applicable to an ultra-long power transmission line. The full-frequency-domain relay protection method comprises the steps of firstly configuring power frequency quantity protection and transient-state quantity protection, wherein power frequency quantity protection comprises the following protection strategies: differential protection, distance protection and direction protection, and transient-state quantity protection comprises the following protection strategies: location protection, boundary protection, polarity comparison protection and signal synchronization protection; and then collecting corresponding electrical quantity information on the line, and executing corresponding protection according to criteria of the protection strategies. In the method provided by the invention, power frequency quantity protection and transient-state quantity protection are involved at the same time, thereby effectively combining advantages of power frequency quantity protection and transient-state quantity protection, realizing mutual compensation of advantages, being applicable to a power transmission system with ultra-long power transmission distance, such as a half-wavelength power transmission system, and being capable of effectively overcoming a defect that traditional line protection principles and protection configuration schemes cannot adapt to requirements of the ultra-long power transmission system.
Description
technical field [0001] The invention relates to a full-frequency domain relay protection method and system suitable for super-long transmission lines. Background technique [0002] With the construction of energy Internet, ultra-long power transmission technology, especially half-wavelength power transmission technology, as an efficient long-distance intercontinental power transmission method, has a good application prospect. In my country's electric power development strategy, long-distance, high-capacity power transmission methods are getting more and more attention. However, the transmission distance of UHV lines is too long, and its fault characteristics are quite different from those of existing short-distance and medium-distance transmission lines: the current at both ends no longer follows the Kirchhoff current law of lumped parameters, and the line The fault current in the middle of the fault is particularly small, and the measured impedance no longer shows a monoton...
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
CPCH02H7/26
Inventor 马晓伟薄志谦王庆平张明赵颖科王林郑灏冯旭
Owner XUJI GRP