IEC 60676 pdf download Industrial electroheating equipment — Test methods for direct arc furnaces
1 Scope and object
This International Standard applies to industrial three-phase direct arc furnaces，the ratedcapacity of which is equal to, or greater than,500 kg.The furnaces are suitable both for solidand liquid charges at or near internal atmospheric pressure.
This standard is also applicable to furnaces having one or more electrodes,other than three-phase furnaces, in so far as it applies.
These furnaces are intended for the melting of ferrous metals (for example,steel,cast iron)and non-ferrous metals (for example, copper); they may also be used as holding furnaces for aliquid charge to superheat and maintain the temperature before tapping.
The object of this publication is the standardization of arc furnace test conditions and ofmethods to determine the main parameters and technical operating characteristics.
NOTE 1 These tests are to be executed independently of the status of compensating equipment.
The scope of this standard does not cover all possible test methods which may be carried outfor the technical and economic assessment of arc furnaces.
NOTE 2 Complementary test conditions may be agreed between manufacturer and user.
Tests for some special equipment for d.c. direct arc furnaces such as controlled rectifiers arecovered by IEC 60146-1-1.
The following referenced documents are indispensable for the application of this document. Fordated references,only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.
IEC 60050(841):1983, International Electrotechnical Vocabulary (IEV) – Chapter 841: Industrialelectroheating
IEC 60146-1-1:1991，Semiconductor convertors – General requirements and line commutatedconvertors – Part 1-1: Specifications of basic requirements
IEC 60398:1999,Industrial electroheating installations – General test methods
For the purposes of this International Standard,the definitions of lEC 60050-841, some ofwhich are reproduced below, as well as the following definitions,apply.
furnace in which the electric arc is the main source of heat[IEV 841-04-27]
direct arc furnace
arc furnace in which the arc is maintained between the charge and one or more electrodes[lEV 841-04-28]
arc furnace installation
furnace assembly with a complete set of electrical equipment comprising
a) main electrical circuit consisting of
– high-voltage equipment;
– a.c. reactor (if applicable);furnace transformer;
high-current line (secondary side);
controlled rectifier and d.c. reactor (only applicable for d.c. direct arc furnaces);
– electrodes,arc and charge not being parts of the arc furnace installation;
b) equipment for control of the electrical parameters，such as boards, panels，desks with
protection, control, measuring and signalling devices
arc furnace shell
steel constructed vessel usually with refractory lined bottom and side walls into which thecharge is placed
rated volume of the furnace
total internal volume of the furnace body as defined by the inner surface of the specified shelllining
NOTE The volume between the upper level of the shell and the underside of the roof is not included in the ratedvolume.