Device for detecting end screen current parameter of high-voltage transformer bushing in real time, and control method for device

Abstract

The invention discloses a device for detecting an end screen current parameter of a high-voltage transformer bushing in real time, and a control method for the device. According to the device, a micro current sensor and a proportion amplifier are respectively connected with a light modulator; an optical fiber transmission system is connected with the light modulator and a light signal receiving converter respectively; an isolation power supply is connected with the light modulator; the micro current sensor senses and measures an end screen current signal; the proportion amplifier amplifies a voltage signal output by the micro current sensor; the amplified voltage signal is converted into a light pulse signal through the light modulator and is transmitted to the signal receiving converter through the optical fiber transmission system; the light signal is demodulated in the signal receiving converter; and an end screen current parameter real-time detection signal is output. The device has the advantages that a measurement result is accurate and reliable; the electric insulation performance and the electromagnetic interference resistance are high; and the device is extremely high in temperature stability and vibration resistance characteristic.

Description

technical field [0001] The invention relates to a real-time detection device and a control method for current parameters of the end screen of a high-voltage transformer bushing, belonging to the technical field of high-voltage equipment state monitoring. Background technique [0002] The high-voltage transformer bushing is one of the key components in the high-voltage transformer. It is responsible for introducing the high-voltage and high-voltage current on the bus into the transformer coil to complete the transformation of electric energy. [0003] The transformer bushing plays a vital role in the operation of the transformer, and its insulation condition has an important impact on the service life of the transformer. The current monitoring method for bushing insulation is mainly to obtain the phase difference between the current at the end of the bushing and the system voltage, and then calculate the dielectric loss factor and capacitance value of the bushing. The dielec...

AI Technical Summary

Problems solved by technology

This real-time detection method of the current parameters of the final screen extends the grounding wire of the final screen current from the original 1cm to tens of meters, which has great potential safety hazards.

In recent years, due to the installation of on-line monitoring systems, most of the casing cracking or explosion accidents were caused by such transformation methods

[0006] In addition, in the environment of strong electromagnetic interference during transformer operation, it is quite difficult to achieve accurate measurement of the current phase of the final screen

At present, in most of the bushing insulation online monitoring systems that are running, the data fluctuates greatly, and the obtained data cannot make a correct evaluation of the bushing insulation

This leads to the installed online monitoring system, which is only a decoration, resulting in a great waste of resources

[0007] At present, there is no device on the market with good safety performance and high accuracy, which is specially used for real-time detection of current parameters at the end screen of high-voltage transformer bushings.

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