Field sampling, isolation and power detection system of signal of low-voltage power line
A low-voltage power line and power detection technology, which is applied in distribution line transmission system, line transmission monitoring/testing, line transmission components, etc., can solve problems such as interference, ineffective communication, and large power fluctuation range of power line carrier signal. Effects of Accurately Testing, Improving Safety and Efficacy
Inactive Publication Date: 2013-07-31
STATE GRID CORP OF CHINA +1
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[0002] One of the main ways of downlink communication in the power consumption information collection system is low-voltage power line carrier. Because low-voltage power line carrier communication is affected by various factors such as product quality, communication capability, line environment, and power load, it is also easily affected by the electromagnetic environment on site. interference, the fluctuation range of the carrier signal power on the power line is relatively large, and it is prone to the state of ineffective communication. The on-site staff need to accurately measure the on-site electromagnetic environment and the actual transmission power of the carrier to help the on-site staff analyze The cause of carrier communication failure
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[0019] Below in conjunction with accompanying drawing, the present invention is further described: as figure 1 As shown, the on-site low-voltage power line signal sampling isolation and power detection system includes an isolation sampling module 2, an intermediate frequency receiver module 3, a low-pass filter 5, a controllable digital synthesizer 6, a processor 1, and a display module 11. The isolated sampling module 2 is directly connected to the low-voltage power line, and is used to isolate and collect carrier signals from the low-voltage power line, and attenuate the signal to a level suitable for power detection for output, and the output terminal of the isolated sampling module 2 is connected to the intermediate frequency receiver module 3 The radio frequency input end 13 of described controllable digital synthesizer 6 is connected with the output interface of processor 1, is used for setting the local oscillator signal output of corresponding frequency by processor 1 a...
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A field sampling, isolation and power detection system of a signal of a low-voltage power line effectively isolates the carrier signal from the power line, and samples and detects the carrier signal. An isolation and sampling module attenuates the signal to an extent suitable for power detection for output, an intermediate-frequency receiver module processes the signal; a controllable digital synthesizer sets local oscillation signal outputs in corresponding frequencies through a processor according to different carrier frequencies; and a receiving signal intensity indication output end of the intermediate-frequency receiver module outputs signal intensity to the processor for processing. The system simply, conveniently and efficiently solves the problem that field carrier communication terminal equipment cannot receive the carrier signal correctly since the carrier signal has attenuation and the like during transmission and is susceptible to the interference of a field electromagnetic environment in a power carrier communication system. With the adoption of the system, field workers can measure and judge the power of the carrier signal in the field electromagnetic environment and on the power line conveniently, and the detection of the power of the carrier signal is realized.
Description
technical field [0001] The invention relates to the detection of power carrier signals, in particular to an on-site low-voltage power line signal sampling isolation and power detection system. Background technique [0002] One of the main ways of downlink communication in the power consumption information collection system is low-voltage power line carrier. Because low-voltage power line carrier communication is affected by various factors such as product quality, communication capability, line environment, and power load, it is also easily affected by the electromagnetic environment on site. interference, the carrier signal power on the power line has a relatively large fluctuation range, and it is prone to the state of ineffective communication. The on-site staff need to accurately measure the on-site electromagnetic environment and the actual transmission power of the carrier to help the on-site staff analyze The cause of the carrier communication failure. In order to fa...
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IPC IPC(8): H04B3/54H04B3/46
Inventor 夏水斌李帆邓桂平李俊丁黎李莉陆健友刘晶晶
Owner STATE GRID CORP OF CHINA