Method for collecting current on low-voltage side of electric furnace transformer and relay protection device

A technology for relay protection devices and electric furnace transformers, applied in emergency protection circuit devices, measuring current/voltage, measuring devices, etc., can solve problems such as inaccuracy and inconvenient current measurement
CN102435813AInactive Publication Date: 2012-05-02XJ ELECTRIC +3
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
XJ ELECTRIC
Publication Date
2012-05-02
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a method for collecting current on the low-voltage side of an electric furnace transformer and a relay protection device. The relay protection device comprises electronic current sensors penetrating through corresponding terminals of lead conductors in parallel connection between the low-voltage side output terminal of the electric furnace transformer and an electric furnace electrode, wherein the signal output ends of each electronic current sensor are connected with each other in series, and are connected with a signal conditioning unit through a shielded cable. The technical scheme can be used for solving the difficult problems of measuring large current on the low-voltage side of the electric furnace transformer as well as the failing to achieve differential protection of the electric furnace transformer, and can meet the requirement on linearity and large-current unsaturation of differential protection.
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Description

technical field

[0001] The invention relates to large current collection and transmission at the low-voltage side of an electric furnace transformer, is the basis for realizing the differential protection of the electric furnace transformer, and belongs to the field of relay protection of electric power systems. Background technique

[0002] A kind of electric furnace transformer with special performance and structure is used in metallurgy and chemical industry, mostly Y / β–³-11 / β–³-11 or Y / Y-12 / β–³-11 connection mode, high voltage side voltage is 35kV~220kV, low voltage side output The voltage is about 200V and directly supplies power to the electric arc furnace, which generates high temperature to smelt ore.

[0003] In the electric furnace smelting process of metallurgy, chemical industry and other industries, the size of the arc current determines the characteristics of smelting. To obtain high-quality products, save electric energy and shorten the smelting cycle, the electrode...

Claims

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