Line longitudinal protection device
A technology of longitudinal protection and relay protection devices, which is applied in the direction of emergency protection circuit devices and electrical components, which can solve the problems of poor device reliability and inability to transmit optical fiber signals, and achieve the effect of improving reliability
Active Publication Date: 2020-06-09
四川电力设计咨询有限责任公司
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Problems solved by technology
In the above-mentioned longitudinal protection device, a single set of signal transmission channels is used between the two protection devices. During use, once the main line optical cable fails, the optical fiber signal cannot be transmitted, and the reliability of the entire device is poor.
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[0021] Below in conjunction with accompanying drawing and embodiment the present invention is further described:
[0022] Such as Figure 1 to Figure 3 As shown, the line longitudinal protection device described in the present invention includes a first relay protection device 1 and a second relay protection device 2; it also includes a first switching device 3, a second switching device 4, a first signal transmission device Ⅰ5, the first signal transmission device Ⅱ6, the second signal transmission device Ⅰ7, the second signal transmission device Ⅱ8, the signal transmission channel Ⅰ9, the signal transmission channel Ⅱ10, the first substation automation system 11, the second substation automation system 12, the first power supply 13 and the second power supply 14, dispatch center automation system 15; the first switching device 3 includes at least one first intermediate relay 31; the common contact of the first intermediate relay 31 is connected with the first relay protectio...
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The invention relates to the technical field of pilot protection, and provides a line pilot protection device which comprises a first relay protection device and a second relay protection device, further comprises a first switching device, a second switching device, a first signal transmission device I, a first signal transmission device II, a second signal transmission device I, a second signal transmission device II, a signal transmission channel I, a signal transmission channel II, a first substation automation system, a second substation automation system, a first power supply, a second power supply and a dispatching center automation system. According to the line pilot protection device, the switching devices are arranged at the two ends of a power transmission line, so that the single set of pilot protection device is connected with the two sets of signal transmission channels, the signal transmission channels are automatically selected by monitoring the quality of the two sets of signal transmission channels in real time, and the reliability of the whole device is improved.
Description
technical field [0001] The invention relates to the technical field of longitudinal protection, in particular to a line longitudinal protection device. Background technique [0002] Transmission line longitudinal direction and longitudinal distance relay protection has been widely used in power systems. It has high requirements on the quality and reliability of signal transmission channels, and the relay protection signal transmission has strong real-time performance. Therefore, it is also affected by channel abnormalities. Big. At present, a single set of transmission line longitudinal protection uses a single set of signal transmission channels, which has poor reliability. Once the signal transmission channel fails, the relay protection signal will not be transmitted. [0003] The patent application with the authorized announcement number CN202363878U discloses a longitudinal protection device for power grids, including two protection devices, the two protection devices a...
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IPC IPC(8): H02H7/26
CPCH02H7/261
Inventor 蔡伟程王豫杨书佺
Owner 四川电力设计咨询有限责任公司