Ultra-high voltage (crosslinked polyethylene)XLPE cable insulation online monitoring device based on vector method and monitoring method
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A cable insulation and monitoring device technology, applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problem of difficulty in distinguishing zero-sequence current leakage current, etc., to achieve the effect of accurate evaluation
Pending Publication Date: 2020-01-21
南方电网科学研究院有限责任公司电网技术研究中心 +1
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The ground current method is to judge the insulation state of the cable insulation by measuring the ground current of the XLPE cable insulation, but this method is affected by the cable grounding method, cross-connection and load current, that is, when the load current is asymmetrical and the zero-sequence current is not zero, It will be difficult to distinguish between the zero sequence current and the leakage current of the cable insulation
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specific Embodiment approach 1
[0031] An on-line monitoring device for extra-high voltage XLPE cable insulation based on the vector method, such as figure 1 As shown, including three-phase power supply, A-phase XLPE cable, A-phase first-end through-hole differential CT, A-phase end-through-type CT, A-phase load, B-phase XLPE cable, B-phase first-end through-hole differential CT, B-phase end-through CT, B-phase load, C-phase XLPE cable, C-phase head end-through differential CT, C-phase end-through CT, C-phase load, FPGA and computer;
[0032] The output end of the three-phase power supply is connected to the input end of the A-phase load through the A-phase XLPE cable, and the A-phase load is connected to the ground GND; the first end and the end of the A-phase XLPE cable are respectively connected to the A-phase head end Through-hole differential CT and A-phase end-through CT, the output end of the measurement winding of the A-phase end-through CT is connected to the input end of the FPGA through a resistor...
specific Embodiment approach 2
[0045] A monitoring method based on a vector method-based ultra-high voltage XLPE cable insulation on-line monitoring device described in the first embodiment, comprising the following steps:
[0046] Step a, the three-phase power supply is connected to the power supply, and the electric energy is transmitted to the load of each phase through the XLPE cables of each phase;
[0047] Step b. Detect the reference phase leakage current information at the core of the C-phase XLPE cable through the measurement winding of the C-phase head-end differential CT, convert the reference phase leakage current information into the reference phase leakage voltage information through the resistor R3, and pass A The / D converter converts the reference phase leakage voltage information into digital reference phase leakage voltage information and transmits it to the FPGA, which is displayed by the computer for the measurement of the reference phase leakage current;
[0048] Step c. Detect the thr...
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Abstract
The invention discloses an ultra-high voltage (crosslinked polyethylene)XLPE cable insulation online monitoring device based on a vector method and a monitoring method, and belongs to the technical field of cable online monitoring. The problem that it is difficult to distinguish a zero-sequence current and a leakage current of cable insulation in the prior art is solved. According to the ultra-high voltage XLPE cable insulation online monitoring device, the output ends of a three-phase power supply are connected to the input end of each phase load through a XLPE cable of each phase, the phaseloads are connected to a ground GND, and a corresponding head-end heat-penetrating differential type CT and tail-end heat-penetrating type CT are connected to the head end and the tail end of the XLPEcable of each phase; the tail-end heat-penetrating type CT of each phase is connected to a FPGA through a resistor, and the FPGA controls a current source to be connected to the head-end heat-penetrating differential type CT of each phase through voltage of each phase; and the head-end heat-penetrating differential type CT of each phase is connected to a resistor, the head-end heat-penetrating differential type CTs of the three phases are connected in series with the FPGA, and the FPGA is bidirectionally connected to a computer. The measurement of the three-phase leakage current is achieved,by comparing and analyzing a vector relationship between the three-phase leakage current and a reference phase leakage current, the accurate evaluation of the insulation status of the XLPE power cableis realized.
Description
technical field [0001] The invention belongs to the technical field of on-line cable monitoring, and in particular relates to an on-line monitoring device and method for super-high voltage XLPE cable insulation based on a vector method. Background technique [0002] Cross-linked polyethylene (XLPE) insulated power cables have become the main body of urban power grids due to their excellent performance. The highest voltage level reaches 500kV. The insulation status of power cables directly affects the operation safety of urban power grids. In order to ensure the safe operation of the power supply system and power cables, it has become a topic of great concern to the power operation department to explore effective online monitoring technology for extra-high voltage XLPE power cable insulation. [0003] For a long time, the insulation state of high-voltage and extra-high-voltage cables has been detected by traditional periodic test methods (ie, preventive tests). It is difficul...
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