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Magnetic bias current monitoring and early-warning system for large-scale transformer

A technology of current monitoring and early warning system, applied in the direction of measuring current/voltage, instruments, measuring electricity, etc., to avoid major losses

Inactive Publication Date: 2012-06-27
SHANDONG ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no suitable product in China at present, and it is necessary to develop a transformer bias current monitoring and early warning system

Method used

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  • Magnetic bias current monitoring and early-warning system for large-scale transformer
  • Magnetic bias current monitoring and early-warning system for large-scale transformer
  • Magnetic bias current monitoring and early-warning system for large-scale transformer

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Embodiment Construction

[0026] exist figure 1 The middle monitoring device 1 collects the neutral point DC signal of the transformer and the voltage, current, active / reactive power, voltage / current harmonics of the transformer under the action of the bias current, as well as the vibration, noise, temperature and other parameters of the transformer, and transmits them through a dedicated channel (such as: carrier wave, microwave, local area network, etc.) or public communication network 7 (such as: GPRS, INTERNET, local telephone network, etc.) to the central master station 6. The central master station 6 is composed of a data server 2, a WEB server 3, an analysis workstation 4 and a communication management machine 5. The communication management machine 5 is responsible for calling data from the monitoring device, and determines whether it is implemented by a dedicated PC according to the number of monitoring devices it manages. Its function is to drive the communication device to request data from ...

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Abstract

The invention discloses a running state online monitoring system for a large-scale transformer, which is divided into a monitoring device and a central main station, wherein the monitoring device not only is used for monitoring the direct current flowing through a neutral point of the transformer on a real-time basis, simultaneously collecting the high and low-voltage side voltage, the current, the power, the harmonic wave and other variables of the transformer and judging whether the transformer runs in a direct-current magnetic bias state in combination with the vibration, the noise, the temperature and other parameters of the transformer; recording and transmitting the parameters of reflecting the affected degree of the transformer in the running process to the central main station by using a modern communication means to further analyze the interference reason and the degree of influence on a whole power grid; and immediately sending out an early warning to effectively avoid the equipment damage, the accident trip and other heavy loss.

Description

[0001] technical field [0002] The invention belongs to the technical field of on-line monitoring of power systems, and in particular provides a large-scale transformer bias current monitoring and early warning system, which is used to prevent damage to equipment and systems caused by bias currents caused by magnetic storms and direct current transmission. Background technique [0003] Magnetic storms caused by solar activity and high-voltage direct current transmission monopolar operation will form a certain intensity electric field on the ground. This ground electric field produces a bias current in the loop formed by the transmission line, the neutral-grounded transformer, and the earth. The bias current is DC or quasi-DC. After flowing into the transformer, a bias flux is generated in the magnetic circuit. Due to the non-linearity of the core material, the flux makes the transformer core produce half-wave saturation. At this time, the excitation current of the trans...

Claims

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Application Information

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IPC IPC(8): G01R19/252G01R31/00
Inventor 孙树敏程艳刘连光刘春明毛庆波
Owner SHANDONG ELECTRIC POWER RES INST
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