Differential protection method of large-power rectifier transformer set

A rectifier transformer and differential protection technology, which is applied in the direction of emergency protection circuit devices, circuit devices, electrical components, etc., can solve problems affecting the stable operation of the power grid system, and difficult to set the value of overcurrent protection, so as to achieve perfect relay protection configuration , to ensure safe and stable operation, and to reduce losses

Inactive Publication Date: 2014-09-24
STATE GRID CORP OF CHINA +2
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  • Claims
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AI Technical Summary

Problems solved by technology

Moreover, the setting value of the above over-current protection is difficult to set, and the situation of over-level tripping occurs, which affects the stable operation of the power grid system

Method used

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  • Differential protection method of large-power rectifier transformer set
  • Differential protection method of large-power rectifier transformer set
  • Differential protection method of large-power rectifier transformer set

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Embodiment Construction

[0051] In order to achieve the above object, the present invention adopts following technical solutions to implement:

[0052] Such as figure 1 , 2 , 3, a high-power rectifier transformer group differential protection system and its protection method, including rectifier transformer valve side large current acquisition based on Rogowski coil principle of electronic current transformer and digital current acquisition equipment, primary side current and Grid-side current digitized current acquisition equipment, combiner, voltage regulating transformer differential protection device that can adjust the balance coefficient of each side in real time, digital rectifier transformer differential protection device and software system that can adapt to different phase shift angles.

[0053] 1. The valve-side current collection of the rectifier transformer adopts a through-type, rectangular sensor head based on the principle of Rogowski coils, which is installed on the lead copper bar o...

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Abstract

The invention relates to a differential protection and relay protection device of a rectifier transformer set, and in particular relates to a differential protection method of a large-power rectifier transformer set. The method is characterized by comprising the following steps: 1, connecting voltage current of the first side, voltage current of the third side, a current signal at the secondary side, namely, the rectifier transformer side, into a collector, converting current voltage signals of FT3 formats, and then connecting to a digital combiner; 2, combining the voltage current signals of FTE formats at each side based on a plurality of paths, converting into 9-2 messages, synchronously processing the current and voltage information input by the collector, and then sending to a regulating transformer protection device through optical fibers; 3, receiving the current signals at each side of the digital combiner through the regulating transformer protection device, then calculating the differential current, and thus realizing related calculation and judging. With the adoption of the protection method, the configuration of the relay protection of the rectifier transformer set is improved, and the recognizing capacity of the protection device for the inner and outer faults of a rectifier transformer area and the fault of a rectifier set is further improved.

Description

technical field [0001] The invention relates to differential protection and relay protection configuration of a rectifier transformer group, in particular to a differential protection method for a high-power rectifier transformer group. Background technique [0002] In metallurgical and electrochemical enterprises, high-power rectifiers are generally used for power supply in production. That is to say, the high-voltage AC incoming line with a voltage level of 35-500kV is stepped down and regulated by a voltage-regulating transformer-rectifying transformer group, and then supplied to the production system with adjustable voltage and hundreds of kiloamperes of direct current through a silicon rectifier device. Each rectifier unit consists of 1 set of voltage regulating transformer, 2 sets of rectifier transformer, rectifier equipment and corresponding auxiliary equipment. [0003] As the core equipment of the electrolytic aluminum series power supply, the rectifier transforme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045H02J13/00
Inventor 刘志远栗磊黄鸣宇王小立温靖华梁亚波徐丽娟刘星姜睿智
Owner STATE GRID CORP OF CHINA
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