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Method for carrying out seamless handover between longitudinal differential protection and pilot protection under single channel

A technology of pilot protection and seamless switching, applied in emergency protection circuit devices, electrical components, error prevention and other directions, can solve the problems of inability to monitor the bidirectional delay consistency of the channel, low channel requirements, and small amount of pilot information, etc. Achieve the effect of strong bit error tolerance, low channel requirements, and strong bit error tolerance

Active Publication Date: 2011-08-17
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve how to establish an effective switching method under the condition that the differential protection and the longitudinal protection share a channel, so as to ensure that the advantages of the principle of the longitudinal differential protection can be brought into play, and the requirements of the longitudinal protection on the channel can be utilized. Low, small amount of longitudinal information, and strong tolerance to channel bit errors; solve the problem that the longitudinal difference protection device cannot monitor the bidirectional delay consistency of the channel, and realize the optical fiber self-healing ring network channel switch when the round-trip routing delay is inconsistent Automatic switching between longitudinal differential protection and longitudinal protection

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  • Method for carrying out seamless handover between longitudinal differential protection and pilot protection under single channel
  • Method for carrying out seamless handover between longitudinal differential protection and pilot protection under single channel
  • Method for carrying out seamless handover between longitudinal differential protection and pilot protection under single channel

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Embodiment Construction

[0015] Attached below image 3 The invention patent is described in further detail, but the invention is not limited to the examples given.

[0016] (1) Description of the overall implementation plan

[0017] The microcomputer protection calculation function is powerful, and it can integrate the longitudinal difference protection and the longitudinal protection program in one device at the same time. The amount of information is far greater than that of vertical protection. The vertical information is only equivalent to about one-tenth of the vertical difference information, because the difference in bandwidth required by the two is huge, so the duty cycle of the HDLC (High level Data Link Control, advanced data link control) frame of the two is also different. Similarly, in the case of the same bit error rate of the channel, the impact of the bit error of the channel on the longitudinal protection is much smaller than that of the differential protection.

[0018] When the ...

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Abstract

The invention relates to a method for carrying out seamless handover between longitudinal differential protection and pilot protection under a single channel, comprising the following steps of: integrating pilot information at the most front end of a differential frame and adding an application layer CRC (Cyclic Redundancy Check) code to the pilot information integrated differential frame at the application layer and transmitting the check code as one part of an HDLC (High-level Data Link Control) frame; forming the HDLC frame by adding the pilot information, the longitudinal information application layer CRC code and horizontal information and automatically generating a link layer CRC code in a link layer and transmitting the check code together with the HDLC frame. The invention has thebeneficial effect of taking full advantage of the characteristics of longitudinal protection, such as low requirements on channels, strong tolerance to error codes, support of one-way operational manner, adaptation to unsymmetrical two-way channel time delay and the like.

Description

technical field [0001] The invention relates to the longitudinal difference and longitudinal protection of electric system lines, in particular to a method for automatically realizing seamless switching between longitudinal difference protection and longitudinal protection in a single protection device according to the channel condition under the condition of single channel. Background technique [0002] Line differential protection has simple principle, fast action speed, high sensitivity, natural phase selection ability, and is not affected by system oscillation, weak feed and other operating modes. With the development of power system communication network, line differential protection has become a high-voltage protection system. The first choice for line main protection. For the point-to-point dedicated optical fiber communication mode, since the two cores of receiving and transmitting are often in the same optical fiber, and there is no photoelectric conversion link in ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H02H7/26
Inventor 吴通华张哲苏理戴列峰郑玉平
Owner STATE GRID ELECTRIC POWER RES INST
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