Laser pump-based online monitoring system for power equipment running state

Abstract

The invention provides a laser pump-based online monitoring system for power equipment running state, comprising an industrial personal computer, two multi-path A / D converters and sensors arranged on a plurality of monitored equipment. The system is characterized in that a data processing unit, two laser pumps, two photoelectric conversion modules and three passive core-through type current sensors are added in the system, wherein tap grounding wires of three phases of A, B and C pass through three current sensors; output ends of the sensors arranged on a plurality of monitored equipment are connected with one multi-path A / D converter; output ends of three current sensors are correspondingly connected with the other multi-path A / D converter; the two multi-path A / D converters and the two photoelectric conversion modules connected with the A / D converters are all arranged close to respectively connected sensors or current sensors; output ends of the two multi-path A / D converters are correspondingly connected with the two laser pumps by fibers through the two photoelectric conversion modules; and the two laser pumps are connected with the industrial personal computer through the data processing unit respectively. The system has strong interference resistance, avoids signal attenuation and distortion, and has excellent working performance.

Description

technical field [0001] The invention provides an online monitoring system for the operation status of power equipment based on a laser pump, which belongs to the technical field of power equipment monitoring. Background technique [0002] In order to ensure the safe operation of power equipment, it is necessary to track and monitor the operation status of power equipment in real time, and perform fault prediction and diagnosis on the equipment. The online monitoring system can complete the state tracking of power equipment, which is the only way to implement condition maintenance. However, in most of the online monitoring systems nowadays, the way of collecting signals is mostly to use wires and cables to transmit analog signals over long distances, that is, the sensors will convert and process the operating signals of power equipment measured by the sensors through long-distance wires and cables. Transmission to the industrial computer, this structure has the following disa...

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Problems solved by technology

[0003] 1. Since the general power station or power plant, the equipment under test (such as current transformer, voltage transformer, coupling capacitor, transformer bushing, iron core, lightning arrester, etc.) The sensor corresponding to the device under test (mainly used to collect signals) can be installed next to the device, but the distance between the output of the sensor and the data processing unit is very far, which may reach fifty or sixty meters, which will inevitably cause signal attenuation and distortion. At the same time, due to the harsh electromagnetic environment in the power station, it causes serious interference to the transmission of analog signals, making the data received by the data processing unit inaccurate

[0004] 2. When the system is working, in order to monitor the dielectric loss of the device under test (capacitive device), that is, at a certain moment, the phase angle difference between the leakage current flowing through the ground wire of the capacitive device and the current on the bus, the signal of PT is generally used instead The signal on the bus is used as a reference; it is strictly required that the collected signal of the device under test and the reference signal are data at the same time, and then the two can be compared to truly reflect the operation of the device, but the above structure is subject to data processing Due to the restriction of the program in the unit, the analog data of the two ports cannot be converted at the same time, so the two signals cannot be fully synchronized in the true sense.

[0005] 3. In some structures, it is considered to advance the A / D conversion part to the vicinity of the device under test, that is, the A / D conversion is performed immediately after the sensor outputs the analog signal, and then the converted digital signal is transmitted to the data processing unit through the wire and cable; In the structure, the interference is very serious. The A / D conversion unit is the key link of data acquisition and processing. If it is too close to the interference source, it will inevitably cause serious electromagnetic interference and greatly distort the collected data.

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