Electrothermal installations. Electric arc furnaces

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 3. Electrical installations for special purposes

Chapter 3.2. Electrothermal installations. Electric arc furnaces

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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3.2.10. On an arc furnace, the performance characteristics for all secondary voltage stages and inductor reactance stages should be empirically measured. If there are several electric furnaces with the same parameters in the workshop, the characteristics are determined on one of them.

3.2.11. During the loading period of electric furnaces, it is necessary to ensure that the hot ends of the electrodes are under the roof of the electric furnace.

3.2.12. On installations of arc steel-smelting furnaces, the setting of the current protection against overload must be consistent with the operation of the automatic regulator of the electric mode. During operation, short circuits must be eliminated by an automatic regulator, and only in cases where the movement of the electrodes cannot quickly eliminate the short circuit, overload protection should work.

3.2.13. The setting of the automatic controller of the electric mode should provide the optimal mode of operation of the electric arc furnace. Regulator settings should be checked periodically.

The scope and timing of inspections of automatic regulators are determined by local instructions, drawn up taking into account the manufacturer’s operating instructions and local conditions. Full inspections of automatic regulators should be carried out at least once a year.

3.2.14. The contact connections of the short network of the current conductor and electrical holders must be subject to periodic inspection at least once every six months.

In order to reduce power losses in the electrode contacts, it is necessary to ensure the high quality of their ends and nipple connections and the tight coiling of the electrodes.

3.2.15. Quality control of oil in the transformer and oil circuit breakers, testing of oil for dielectric strength, checking of contacts in switches, transformers and oil circuit breakers is carried out within the time limits established by the Consumer's electrical equipment manager, but not less than it is provided for by these Rules for general electrical installations.

3.2.16. All work on preparation for smelting at electroslag remelting plants is carried out only with the transformer turned off. In cases where one transformer alternately powers two electroslag installations, special instructions must be developed for the safe preparation of the second installation when the first one is turned on. The list of these electrical installations must be approved by the Consumer's manager, and the instructions must be brought to the attention of the personnel.

3.2.17. Electric arc furnaces must be equipped with devices that do not allow deteriorating the quality of electricity at the border determined by the power supply agreement.

The operation of electric arc furnaces without filter compensating devices is not allowed.

3.2.18. Work on bypassing, extending and replacing electrodes on an arc steel-smelting furnace, as well as sealing electrode holes must be carried out with the electric furnace switched off.

Bypass and build-up of stuffed self-sintering electrodes of ore-thermal furnaces, welding of a brake band and loading with electrode mass can be carried out without removing the voltage in electrical installations up to 1000 V. These works must be carried out from isolated working (bypass) platforms with interphase dividing insulating partitions.

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

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