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

Anti-delay all-impedance relay and action method and device

A relay, full-impedance technology, applied in the field of devices, inverse-delay full-impedance relays and action methods, can solve the problem that fixed-delay impedance relays cannot automatically adjust the action time, etc., so as to improve action reliability, short-circuit points, and faults. light effect

Inactive Publication Date: 2016-06-08
STATE GRID SHANDONG ELECTRIC POWER +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the embodiment of the present invention is that the fixed-delay impedance relay in the prior art cannot automatically adjust the action time according to the distance of the short-circuit point

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
  • Anti-delay all-impedance relay and action method and device
  • Anti-delay all-impedance relay and action method and device
  • Anti-delay all-impedance relay and action method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides an action method for anti-delay full-impedance relays. For example, it is applied to anti-time-delay full-impedance relays. According to the size of the measured value, the measured value is small and the action is fast; the measured value is large and the action is slow. The impedance relay is called Anti-time-delay impedance relays, such as figure 1 As shown, the anti-time-delay full-impedance relay action method includes the following steps:

[0044] S1. Obtain the measured voltage and measure the current

[0045] S2. Calculate the measured impedance Z according to the following formula m and action delay time t: Among them, Z set is the setting impedance, k 1 is the first tuning coefficient, R is the second tuning coefficient, T set is the time setting factor;

[0046] S3. Judgment|Z m |≤|Z set |Whether to be established; when|Z m |≤|Z set|, go to step S4; otherwise, go to step S5.

[0047] S4. Delaying for a period of time...

Embodiment 2

[0052] Corresponding to the above-mentioned embodiment 1, this embodiment provides an anti-time-delay full-impedance relay operating device, such as figure 2 shown, including:

[0053] Acquisition unit 41, used to obtain the measurement voltage and measure the current

[0054] Calculation unit 42, for calculating the measurement impedance Z according to the following formula respectively m and action delay time t: Among them, Z set is the setting impedance, k 1 is the first tuning coefficient, R is the second tuning coefficient, T set is the time setting factor;

[0055] Judgment unit 43, for judging |Z m |≤|Z set |Is it established?

[0056] Action signal generation unit 44, for when |Z m |≤|Z set |, after a delay of t, a signal is generated to make the full-impedance relay act.

[0057] Preferably, k 1 The value range of R is 0.1~100, the value range of R is 0.01~3, and T set The value range is 1~2.

[0058] The above anti-delay full-impedance relay opera...

Embodiment 3

[0060] This embodiment provides an anti-time-delay full-impedance relay, such as image 3 shown, including:

[0061] Potential transformer 1 for receiving the measuring voltage The measured voltage Convert into a voltage suitable for the A / D converter 3 and output it;

[0062] Current / voltage converter 2 for receiving the measuring current The measured current Convert into a voltage suitable for the A / D converter 3 and output it;

[0063] The A / D converter 3 is used to convert the received voltage output by the voltage transformer 1 and the current / voltage converter 2 into a digital quantity and output it;

[0064] Processor 4 comprises anti-time-delay full-impedance relay action device, and said anti-time-delay full-impedance relay action device includes:

[0065] An acquisition unit, configured to acquire the measurement voltage according to the digital quantity output by the A / D converter 3 and measure the current

[0066] Calculation unit for calculating the...

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 an action method and device of an anti-delay all-impedance relay and the anti-delay all-impedance relay. The method comprises the following steps: acquiring a measurement voltage (see the specification) and a measurement current (see the specification), and separately calculating a measurement impedance Zm and an action delay duration t; judging whether the condition that an absolute value of Zm is less than or equal to an absolute value of Zset is satisfied; and if the absolute value of Zm is less than or equal to the absolute value of Zset, delaying for t, and generating a signal for enabling the all-impedance relay to act. The method is simple in criterion and high in reliability; and when the fault is more severe, the action speed of the anti-delay all-impedance relay is higher, so that the damage of the severe fault on a power device is alleviated.

Description

technical field [0001] The invention relates to the field of power system transmission line protection, in particular to an anti-time-delay full-impedance relay, an operating method and a device. Background technique [0002] Distance protection is widely used in power system line protection, and impedance relay is the measuring element in distance protection. The impedance (distance) relay reflects the distance of the short-circuit point of the power system. If the short-circuit point falls within the protection zone, the impedance relay acts; otherwise, it does not act. There are many types of impedance relays for different applications. With the development of urban power grids, urban 110kV feeders are gradually increasing, and full-impedance relays can be used as measuring components for distance protection of 110kV feeders. [0003] Patent CN91221361 proposes an impedance relay with low transient measurement error, patent CN03153450 proposes a phase compensation imped...

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 Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 周生奇贾亚军徐超撖奥洋张滨董林刘惠群李飞王超王树春吴星原温建春禚站峰赵会亮娄亮李辰綦鲁波钟世民刘祥圣罗鲁东于立涛
Owner STATE GRID SHANDONG ELECTRIC POWER
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com