High-voltage cable outer sheath insulation state on-line monitoring system and control method thereof
A high-voltage cable, insulation state technology, applied in the field of power cables, can solve the problems of inconvenient operation and maintenance personnel state maintenance and fault finding, no fault location function, etc., to achieve the effect of simple structure, low cost and reliable operation
Active Publication Date: 2015-10-14
STATE GRID CORP OF CHINA +1
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[0004] Traditional on-line monitoring and fault diagnosis devices are mainly aimed at the judgment of the overall structural performance of the outer sheath of high-voltage cables. Overhaul and Troubleshooting
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[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0040] An online monitoring system for the insulation status of the outer sheath of a high-voltage cable, such as figure 1 Shown is the wiring diagram of the system. The system includes monitoring devices 20 connected to the 9 positions of the intermediate joints on the measured high-voltage cable section 30. The DC power supply is formed by rectifying and filtering the 220V power frequency alternating current to supply power for each monitoring device 20, and The data communication between each monitoring device 20 and the industrial computer 10 is realized through the RS-485 optical fiber communication line, and the "three remote" functions of remote control, telemetry and remote signaling are completed.
[0041] The structure of monitoring device 20 is as figure 2 As shown, it includes a DC power supply module 1, a current detect...
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The invention discloses a high-voltage cable outer sheath insulation state on-line monitoring system and a control method thereof and belongs to the power cable technical field. The system includes monitoring devices installed at middle joints on a measured cable section, an RS-485 communication line, an RS-485 repeater, photoelectric converters and an upper computer; the monitoring device includes a direct-current power source module, a current detection module, a power grid isolation protection module, a pattern selection module, a parameter setting module, a data processing module, a self-detecting and indicating module and a data display and diagnosis module. A control program judges the electrification and initialization of the system at firstly, and then, performs self diagnosis, parameter setting and state pattern judgment, and performs corresponding interrupt instructions according to different patterns. According to the high-voltage cable outer sheath insulation state on-line monitoring system and the control method of the invention, a direct-current superposition method and a grounding loop current detection method are combined together so as to perform on-line monitoring on the insulation state of a cable outer sheath and perform fault location on suspicious defects, and therefore, real-time on-line monitoring and fault location of the insulation condition of the high-voltage cable outer sheath can be effectively realized.
Description
technical field [0001] The invention relates to the technical field of power cables. Background technique [0002] The damage of the high-voltage XLPE power cable during operation first comes from the damage of the outer sheath, and the damage of the insulation layer of the outer sheath will cause two points of the metal sheath to be directly grounded. Therefore, it is inevitable that an induced current will be generated in the metal sheath. The magnitude of the induced current is related to the grounding resistance, the length of the cable and the current of the wire core. The induced current on the metal sheath will cause a large loss, making the cable Local heating not only wastes electric energy, but also reduces the transmission capacity of the cable, seriously reduces the service life of the cable, and threatens the safe operation of the cable. In addition, if the cable metal sheath is directly grounded or exposed, the metal sheath will be corroded. After the sheath ...
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Login to View More IPC IPC(8): G01R31/12G01R31/08
CPCY04S10/52
Inventor 郭刚李雪松郝春生赵文涛韩卫星李枭雄任陟
Owner STATE GRID CORP OF CHINA