Method of Reactive Power Compensation Switching of Low-voltage Thyristor in Metallurgical Electric Furnace

A thyristor switching and thyristor technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as operating overvoltage, short service life, switching, etc., and achieve fast response and extended service life , to avoid the effect of overfilling

Inactive Publication Date: 2012-02-15
四川伟力得能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1: Since the action elements of contactors and circuit breakers are all electromagnetic induction type, they cannot be switched when the voltage and current cross zero due to their action time of about 40-60ms, resulting in a large closing surge current and reducing the capacitor And the service life of actuators such as contactors
[0005] 2: Due to its inherent action characteristics, it is easy to cause operating overvoltage. After opening once, it must wait for the capacitor to discharge (about 3 minutes) before closing the next time. It cannot meet the requirements of fast switching of reactive power compensation during the lifting process of metallurgical electric furnace electrodes. process requirements
[0006] 3: Adopt the method of first cast first cut, the frequency of mechanical action is frequent, and the service life of components is short

Method used

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  • Method of Reactive Power Compensation Switching of Low-voltage Thyristor in Metallurgical Electric Furnace
  • Method of Reactive Power Compensation Switching of Low-voltage Thyristor in Metallurgical Electric Furnace
  • Method of Reactive Power Compensation Switching of Low-voltage Thyristor in Metallurgical Electric Furnace

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Embodiment 2

[0028] Such as Figure 1-2 As shown, the applications of the present invention are as follows:

[0029] 1. On the terminal block of the switch cabinet on the high voltage side of the metallurgical electric furnace, the three-phase current and voltage signals of A, B, and C are passed through the current transmitter ① and voltage transmitter ②, and the secondary signal is transmitted to the controller input terminal through the communication wire ③. The controller sends out a pulse trigger signal after processing by the CPU system.

[0030] 2. When the power of the metallurgical electric furnace is ≤0.9, the pulse signal drives the static fixed switching unit. When the voltage crosses zero, each group of thyristors of each phase is turned on in sequence at a time interval of 1 cycle, so that the power factor reaches 0.9.

[0031] 3. When the power of the metallurgical electric furnace reaches 0.9, the controller will continue to sample and analyze, and send a pulse signal to the swit...

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Abstract

The invention discloses a method for reactive power compensation switching of low-voltage thyristors in metallurgical electric furnaces. First, the capacitors and reactor groups in the reactive power compensation device are divided into several groups according to the three-phase A, B, and C currents of each group ≤ 200A, and each phase is 2 / The capacity of 3 is used as a fixed switching, and then the thyristor and the trigger circuit are assembled with the heat sink, and the heat sink adopts a water-cooled circulation method; the thyristor, the capacitor, and the reactor are connected and fixed through copper conductors to form a group of thyristors. unit, through the thyristor reactive power compensation switching controller, and finally select the static fixed thyristor switching compensation unit group number according to the requirement of power factor cosφ=0.9; the present invention can meet the requirement of reactive power compensation amount under normal production process conditions of metallurgical electric furnace Demand, the service life of the device is extended, the possibility of under-filling is eliminated, and the occurrence of over-filling is avoided.

Description

Technical field [0001] The invention relates to a control method of an executive element in a low-voltage reactive power compensation device of a metallurgical electric furnace, in particular to a method for reactive power compensation switching of a low-voltage thyristor of a metallurgical electric furnace. Background technique [0002] Metallurgical electric furnace is a kind of high energy consumption equipment, mainly divided into more than 20 series such as calcium carbide, industrial silicon, ferrosilicon, ferromanganese, nickel iron, and yellow phosphorus. During the production and operation of the equipment, the voltage is low, the current is large, and the electrode needs to be continuously adjusted according to the furnace conditions. The load changes quickly. Due to its low power factor (about 0.7 to 0.86), a reactive power compensation device needs to be installed for compensation. [0003] The traditional high and low voltage compensation device mainly consists of cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 陈继军
Owner 四川伟力得能源股份有限公司
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