Composite power supply-based device for detecting comprehensive parameters of high voltage system on line

Abstract

The invention relates to a composite power supply-based device for detecting comprehensive parameters of a high voltage system on line. The device comprises a current transformer, a current sensor, a temperature sensor, a voltage dividing signal element, a bushing, a power wire, a signal wire, a high voltage side signal processing and converting circuit, a photocell, a transmitting tube, an insulator, an air gap, a voltage dividing element, a receiving tube, a light source, a low voltage side signal processing and light source control circuit and a singlechip processing device. By the device, an optical fiber which is packaged in the insulator transmits multi-channel voltage signals, current signals and temperature signals, and light energy which is provided by the high voltage side current transformer and the lower voltage side signal processing and converting circuit provides power which is required by a high voltage part to process the signals, so that voltage signals, current signals and temperature signals of the running high voltage system can be detected in real time. The composite power supply-based device for detecting the comprehensive parameters of the high voltage system on line can detect the voltage signals, the current signals and the temperature signals of the running high voltage system in real time, and has the characteristics of real-time, reliable and accurate monitoring and detection of the parameters of the high voltage system, integrated functions and simple structure.

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...

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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

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