Parameter recognition based power distribution network line insulation monitoring method
A technology of parameter identification and line insulation, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., to achieve the effect of overcoming serious interference and a simple method
Inactive Publication Date: 2017-06-13
XI AN JIAOTONG UNIV +1
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[0004] The purpose of the present invention is to provide a method for monitoring the insulation of distribution network lines based on parameter identification to solve the shortcomings of the existing on-line monitoring technology for power cable insulation
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[0034] The present invention will be further described below in conjunction with accompanying drawing:
[0035] see Figure 1 to Figure 9 As shown in the present invention, a method for monitoring the insulation of distribution network lines based on parameter identification includes the following steps:
[0036] 1) Build a model
[0037] In a multi-outlet neutral point ungrounded distribution network system, all lines adopt the distributed parameter model. According to circuit theory, any branch without insulation deterioration has the following equation:
[0038]
[0039] In the formula, c and r are the ground capacitance and ground resistance of a phase line, i a , u ag i al Respectively, the A-phase line current, bus voltage and load current of the branch, i b , u bg i bl Respectively, the B-phase line current, bus voltage and load current of the branch, i c , u cg i cl are the C-phase line current, bus voltage and load current of the branch respectively. Af...
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The invention discloses a parameter recognition based power distribution network line insulation monitoring method. The method includes establishing a mathematic model for a power distribution network with an ungrounded neural point assuming line insulation is complete; solving model parameters through a least square method by utilizing zero sequence voltage and zero sequence current data obtained through simulation when insulation degrades; judging the insulation condition of a line with the aid of obtained symbols of ground capacitance and ground resistance of the line. According to the invention, equivalent ground resistance and equivalent ground capacitance related to line insulation are recognized directly, so that whole-time online monitoring and early warning can be realized without addition of any external electric devices. The judgment of insulation degradation is based on recognition of the symbols of the parameters. Action relations are clear and distinguishable. A condition with action value instability is avoided.
Description
technical field [0001] The invention belongs to the field of electric power system relay protection, in particular to a method for monitoring insulation of distribution network lines based on parameter identification. Background technique [0002] Power cables have been used more and more widely because of their safety, reliability, and advantages of beautifying cities and the layout of factories and mines. The cable can adapt to various laying environments such as underground and underwater, and its power supply conditions are less affected by natural meteorological factors and environmental factors, and cause less personal injury. Because the cable lines, especially the cable lines of the urban distribution network, are mostly buried underground, it is very difficult to find them once a fault occurs. Not only waste a lot of manpower and material resources, but also cause power failure loss. [0003] The quality of cable insulation is a key factor affecting the safe and r...
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IPC IPC(8): G01R31/08G01R31/12
CPCG01R31/086G01R31/088G01R31/12
Inventor 宋国兵顾垚彬常仲学郭上华张维
Owner XI AN JIAOTONG UNIV