Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for judging disappearance of secondary direct-current power supply of far-end transformer substation

A secondary DC and substation technology, applied in electrical components, circuit devices, information technology support systems, etc., can solve problems such as the inability of the action time to meet the system, slow action time, and threats to the safe and stable operation of the system

Active Publication Date: 2015-07-08
CHINA SOUTHERN POWER GRID COMPANY +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the remote backup protection needs to consider the coordination relationship between segments, its action time is relatively slow. In severe cases, its action time may not meet the requirements of system stability, which poses a serious threat to the safe and stable operation of the system.
If the disappearance of the secondary DC power supply of the substation can be identified online, corresponding strategies can be adopted to speed up the action speed of the adjacent substation protection and quickly remove the fault, but so far, there is no method for online identification of the disappearance of the secondary DC power supply of the substation

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for judging disappearance of secondary direct-current power supply of far-end transformer substation
  • Method for judging disappearance of secondary direct-current power supply of far-end transformer substation
  • Method for judging disappearance of secondary direct-current power supply of far-end transformer substation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] The invention provides a method for judging the disappearance of the secondary DC power supply of the remote substation. According to the principle that the protection of the secondary DC power supply and the communication power supply circuit need to be independently designed according to the secondary design specification of the substation, it can be known that when the protection secondary DC power supply circuit loses power , the communication power supply circuit is still normal, so the present invention considers that the protection secondary DC power supply failure signal is transmitted to the opposite side substation through the measurement and control device and the communication device. The content of the judgment method is: the substation secondary DC power supply (including the protection device DC a...

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

No PUM Login to View More

Abstract

The invention discloses a method for judging disappearance of a secondary direct-current power supply of a far-end transformer substation. A power loss alarm contact of the secondary direct-current power supply of the transformer substation is introduced into I / O on-off input of a communication cell measuring and controlling device. The communication bandwidth of MSTP equipment is divided into the protection bandwidth and measuring and controlling bandwidth which are independent from each other, the protection bandwidth is used for conveying protection information, and the measuring and controlling bandwidth is used for conveying access power loss on-off input information of measuring and controlling equipment. A receiving end transformer substation protection device can detect received offside information in real time. The judgment whether a secondary direct-current power supply of an offside transformer substation disappears can be given out in real time by comparing information of the protection bandwidth with information of the measuring and controlling bandwidth. According to the method, a measuring and controlling loop of an independent power supply and a communication loop of independent bandwidth can be utilized to transmit disappearance information of the secondary direct-current power supply. Disappearance of the secondary direct-current power supply of the far-end transformer substation can be accurately recognized in an online mode by comparing the protection bandwidth with the measuring and controlling bandwidth. Thus, decision basis can be provided for following protection strategies or control strategies.

Description

technical field [0001] The invention relates to a method for judging the disappearance of a secondary DC power supply of a remote substation in a power system. Background technique [0002] The disappearance of the secondary DC power supply of the power substation (the DC loss of the protection device or the DC loss of the operating power supply) is a serious accident in the operation of the substation. After the secondary DC power supply disappears, all the protection devices or operating circuits of the substation cannot work. The main transformer, bus differential, high reactance, and line outlets all lose protection. Once a fault occurs, the station will have no protection action, and must wait for the delay action of remote backup protection of other adjacent stations to isolate the fault. Such as figure 1 In station C, the whole station loses power. When f1 fault occurs on the AC line, the line protection of CB2 cannot operate to remove the fault due to the loss of pr...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00
CPCY02E60/00Y04S10/16
Inventor 黄维芳李园园潘斌李力文安杨贵田霖戴光武赵曼勇李建设刘之尧
Owner CHINA SOUTHERN POWER GRID COMPANY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products