Differential channel transmitting and receiving delay inconsistency judgment method and device and differential protection communication system
A discrimination method and differential protection technology, applied in the direction of automatically disconnected emergency protection devices, circuit devices, emergency protection circuit devices, etc. Consistency can not be monitored and other issues to achieve the effect of improving reliability and stability
Pending Publication Date: 2022-02-15
NR ELECTRIC CO LTD +1
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[0006] The purpose of this application is to provide a method, device and differential protection communication system for judging the inconsistency of transmission and reception delays of differential channels. It is found that the transmission and reception delays of the channels are inconsistent
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[0058] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.
[0059] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or mor...
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The invention discloses a differential channel transmitting and receiving delay inconsistency judgment method and device and a differential protection communication system, which are used for any side of a differential channel, and the judgment method comprises the following steps: calculating channel delay; adjusting sampling data on two sides of the differential channel to a synchronous state; calculating a channel delay variable quantity in real time, and when the channel delay variable quantity is greater than a first threshold value, starting channel transceiving delay inconsistency judgment; and determining whether to lock differential protection or not according to a channel transceiving delay inconsistency judgment result. The reliability and the stability of the differential protection are improved by judging the consistency of the transmitting and receiving delay of the channel and selecting whether to lock the differential protection or not according to the judgment result.
Description
technical field [0001] The present application relates to the field of electrotechnical technology, in particular to a method and device for judging inconsistency of differential channel delays and a differential protection communication system. Background technique [0002] The longitudinal differential protection has the advantages of clear protection range, simple principle, stability and reliability. And with the development of communication technology, differential protection has been widely used. Differential protection uses the communication network to exchange information, transmits information such as the current on the opposite side to the local side, calculates the differential current and braking current based on the current on the local side and the opposite side, and judges whether it is an internal fault based on the differential action characteristics . [0003] The premise of differential protection to work correctly is data synchronization, so data synchr...
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IPC IPC(8): H02H7/26H02H3/06
CPCH02H7/26H02H3/06H02H3/305H02H3/05H02H3/006H02H1/0084H02H7/261H02H1/0061H02H3/063
Inventor 张洪喜赵青春徐晓春徐海洋谢华戴光武陆金凤卜立之李奔
Owner NR ELECTRIC CO LTD