On-line detection device for comprehensive parameters of high voltage system based on composite power supply

Abstract

The invention relates to an online detection device for comprehensive parameters of a high-voltage system based on a composite power supply, which includes a current transformer, a current sensor, a temperature sensor, a voltage divider signal element, a bushing, a power line, a signal line, and a high-voltage side signal processing conversion Circuit, photocell, transmitting tube, insulator, air gap, voltage divider, receiving tube, light source, low-voltage side signal processing and light source control circuit, and single-chip processing device. The on-line detection device transmits multiple voltages through optical fiber packaged in the insulator , current, temperature signal, high-voltage side current transformer and light energy provided by the low-voltage side provide the power energy required for high-voltage part signal processing, and can detect the voltage, current, and temperature signals of the high-voltage system in real time, and have high-voltage system parameters in real time , reliable, accurate on-line monitoring and detection, function integration and structure simplification.

Description

technical field [0001] The invention relates to an on-line detection device for comprehensive parameters of a high-voltage system based on a composite power supply, belonging to the field of electric power systems. Background technique [0002] The three most important parameters that must be monitored and detected during the operation of the power system are voltage, current, and temperature. According to actual operation and retrieval, there have been many discussions on online detection devices for high-voltage systems in the literature, but in practical applications, the voltage quantity Low reliability and bulky epoxy resin casting type voltage transformers are used for detection. Although there are researches and products of electronic and photoelectric measuring devices for temperature and current monitoring and detection, these researches or products are single-parameter Monitoring or testing, high-voltage systems, especially the construction of smart grids, urgently...

AI Technical Summary

Problems solved by technology

[0002] The three most important parameters that must be monitored and detected during the operation of the power system are voltage, current, and temperature. According to actual operation and retrieval, there have been many discussions on online detection devices for high-voltage systems in the literature, but in practical applications, the voltage quantity Low reliability and bulky epoxy resin casting type voltage transformers are used for detection. Although there are researches and products of electronic and photoelectric measuring devices for temperature and current monitoring and detection, these researches or products are single-parameter Monitoring or testing, high-voltage systems, especially the construction of smart grids, urgently need integrated devices for comprehensive monitoring and testing of the three most important parameters, so as to ensure the reliability, accuracy, functional integration and structural integrity of monitoring and testing. simplify

At present, the high-voltage part circuits of single-parameter electronic and photoelectric monitoring or detection devices for voltage, current and temperature almost all use current sensors as the power supply to provide the energy required by electronic circuits. The patent "medium and high voltage system" invented by Zhang Peiming and others "On-line detection signal transmission device" (patent number: ZL 200420064929.2) adopts this scheme, but the fatal problem of this scheme is that when the power system current is small or there is no current, the energy provided by the current sensor cannot guarantee the normal operation of the electronic circuit , so that the high-voltage system cannot be monitored or detected normally, and poses a serious threat to the safe and reliable operation of the high-voltage system, especially for the monitoring or detection of voltage. When the high-voltage system is in operation, but the load or The load current is very small, that is, there is high voltage at this time, but there is no current or the current is very small. This situation will cause mismeasurement of high voltage, which may cause serious consequences

Images