Device and method for online monitoring power supply system external Insulation filthy status
A technology of power supply system and monitoring device, which is used in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of insulators or bushings that cannot be monitored at the same time, the degree of new signal interference is large, and high-speed sampling cannot be achieved. Achieve the effect of filtering out three-phase unbalanced current and alternating interference current, good protection, and stable test data
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[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0028]As shown in Figure 1, an on-line monitoring device for the pollution state of the external insulation of the power supply system of the present invention includes a lower computer 8 with a man-machine interface 7, and a pollution sound and light alarm unit connected to the control output of the lower computer 8 14 and the pollution real-time display evaluation unit 15, the input of the lower computer 8 is respectively connected to two sampling signals, one of which is connected to a neutral point O of the three-phase voltage transformer 3 connected with the three-phase overhead line 1 in a star connection. A DC superposition unit 4, a protection and filter unit 5 is connected in series between the DC superposition unit 4 and the ground, the output of the protection and filter unit 5 is connected to the lower computer 8 through a sampling ...
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