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Series compensation circuit of submerged arc furnace

A series compensation, submerged arc furnace technology, used in reactive power compensation, circuit devices, AC network circuits, etc., can solve problems affecting equipment performance and safe operation, unstable components of power supply systems, and overexcitation of series transformers. The effect of amplifying unstable components, preventing system resonance, and preventing transformer over-excitation

Pending Publication Date: 2021-02-02
西安布伦帕电力无功补偿技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is to solve the series compensation device of submerged arc furnace, affected by the unstable components in the power supply system, it is easy to cause over-excitation of the series transformer, but the current method to solve this problem by improving the excitation characteristics of the transformer has high cost and affects the performance of the equipment and To solve the technical problem of safe operation, provide a kind of submerged arc furnace series compensation circuit

Method used

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  • Series compensation circuit of submerged arc furnace
  • Series compensation circuit of submerged arc furnace
  • Series compensation circuit of submerged arc furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as image 3 , is a basic circuit scheme of the submerged arc furnace series compensation circuit of the present invention, including a compensation capacitor C1, a damping circuit connected in parallel with the compensation capacitor C1, the damping circuit includes a parallel resistance Rz and a reactance Lz, and a switch K2 connected in series, and It includes a series blocking filter loop and a resistor R2, the blocking filter loop includes a parallel reactance L2 and a capacitor C2, and the blocking filter loop is connected in parallel with the damping loop after being connected in series with the resistor R2. Compared with the existing submerged arc furnace series compensation circuit, capacitor C2, reactance L2 and resistor R2 are added. During normal operation, capacitor C2 and reactance L2 are in a parallel resonance state. In this way, the current of resistor R2 is very small during normal operation. It consumes very little power. When the system is in an ...

Embodiment 2

[0055] Such as Figure 4, is another submerged arc furnace series compensation circuit provided by the present invention, which includes a compensation capacitor C1 and a damping circuit connected in parallel with the compensation capacitor C1, wherein the damping circuit includes a parallel connection of resistance Rz and reactance Lz, and a switch K2 connected in series , also includes a blocking filter loop, the blocking filter loop includes a reactance L2, and the reactance L2 is connected in parallel with the switch K2. In the second embodiment, the compensation capacitor C1 and the capacitor C2 in the first embodiment are equivalently combined into C1, and the resistance value of the resistor Rz is matched through the reactance Lz. The resistance value of the resistor Rz can be more than 10 times the impedance of the reactance Lz, so that Controls the power of the resistor Rz during normal operation.

Embodiment 3

[0057] Such as Figure 5 , a submerged arc furnace series compensation circuit, including a compensation capacitor C1, a damping circuit connected in parallel with the compensation capacitor C1, wherein the damping circuit includes a parallel resistance Rz and a reactance Lz, and a switch K2 connected in series, and also includes a blocking filter circuit , The blocking filter circuit includes reactance L2 and capacitor C2, reactance L2 is connected in parallel with switch K2, capacitor C2 is connected in parallel with reactance L2, compared with embodiment 1, embodiment 3 omits resistor R2, and its function is replaced by resistor Rz.

[0058] Same as the first embodiment, the compensation capacitor C1 is determined by the following formula:

[0059]

[0060] The relationship between reactance L2 and capacitance C2 can be expressed by the following formula:

[0061]

[0062] In practical applications, the compensation capacitor C1, capacitor C2 and reactance L2 coopera...

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Abstract

The invention relates to a series compensation technology for a submerged arc furnace, and aims to solve the technical problems that a conventional series compensation device for submerged arc furnaceis influenced by unstable components in a power supply system and thus easily causes over-excitation of a series transformer and a conventional method for solving the over-excitation by improving theexcitation characteristic of the transformer is too high in cost and has influence on equipment performance and safe operation. To overcome the above technical problems, the invention provides a series compensation circuit of a submerged arc furnace. The series compensation circuit comprises a compensation capacitor C1, a damping loop connected with the compensation capacitor C1 in parallel, a blocking filter loop and a resistor R2, wherein the damping loop comprises a resistor Rz and a reactor Lz which are connected in parallel and a switch K2 connected with the resistor Rz and the reactor Lz in series; the blocking filter loop comprises a reactor L2 and a capacitor C2 which are connected in parallel; and the blocking filtering loop is connected with the resistor R2 in series and then connected with the damping loop in parallel, or the blocking filter loop comprises the reactor L2 which is connected with the switch K2 in parallel.

Description

technical field [0001] The invention relates to a submerged arc furnace series compensation technology, in particular to a submerged arc furnace series compensation circuit. Background technique [0002] Submerged arc furnace series compensation is an energy-saving technology mainly used in large-capacity submerged arc furnaces, which improves the power factor, and at the same time, can greatly reduce the voltage drop of the short network, improves the power transmission efficiency of the submerged arc furnace, and enables the power to be effectively It is transported to the inside of the submerged arc furnace, which effectively improves the efficiency of entering the furnace, thereby achieving a better energy-saving effect. [0003] The basic principle of the existing submerged arc furnace series compensation device is as follows: figure 1 and figure 2 As shown, among them, figure 1 It is the basic schematic diagram of the series transformer in the submerged arc furnace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02H9/04
CPCH02J3/1807H02H9/04Y02E40/30
Inventor 郭天兴
Owner 西安布伦帕电力无功补偿技术有限公司