IEC 60779:2020 pdf download

IEC 60779:2020 pdf download.Installations for electroheating and electromagnetic processing – Test methods for electroslag remelting furnaces
1 Scope
Clause 1 of IEC 60398:2015 is replaced by the following. Replacement: This International Standard specifies the test procedures, conditions and methods for determining the main performance parameters and operational characteristics of electroslag remelting furnaces. Measurements and tests that are solely used for the verification of safety requirements of the installations are outside the scope of this document and are covered by IEC 60519-1 and IEC 60519-8. This document applies to industrial electroslag remelting furnaces, the rated capacity of which is equal to, or greater than, 50 kg. This document is applicable to industrial electroslag remelting furnaces having one or more electrodes and having different melting power supplies, such as alternating current, direct current, or low-frequency current. This document includes the concept and material on energy efficiency dealing with the electrical and processing parts of the installations, as well as the overall performance.
2 Normative references
Clause 2 of IEC 60398:2015 is applicable except as follows. Replacement: The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Modification: Delete the footnotes . Additions: IEC 60398:2015, Installations for electroheating and electromagnetic processing – General performance test methods IEC 60519-8, Safety in installations for electroheating and electromagnetic processing – Part 8: Particular requirements for electroslag remelting furnaces IEC 60676:2011, Industrial electroheating equipment – Test methods for direct arc furnaces
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60398:2015 as well as the following apply. 3.1 General Additions: 3.1.101 electroheating installation with an electroslag remelting furnace complete assembly of electroheating equipment and electrical and mechanical accessories necessary for operation and utilization of an electroslag remelting furnace 3.1.102 power of an electroheating installation apparent power S (in kVA) or active power P (in kW) measured at the input of the supply line 3.1.103 power factor of an electroheating installation cosφ ratio of the active power to the apparent power measured at the input of the supply line 3.1.104 on-load voltage of an electroslag remelting furnace U F voltage measured between two points, which, depending on the type of a furnace, are either the base plate, the electrode clamping device(s) bringing the melting electrical current to the consumable electrode(s)/stub(s), or the point of common connection of the multiple return conductors Note 1 to entry: In case of a furnace without two electrodes corresponding to single-phase AC power supply, voltage is measured between the base plate and the electrode clamping device(s), seeing U F in Figure AA.1 and Figure AA.2. Note 2 to entry: In case of a furnace with two electrodes corresponding to single-phase AC power supply, voltage is measured between the two electrode clamping devices. Note 3 to entry: In case of a furnace of a coaxial design for a single-phase AC power supply, the voltage is measured between the electrode clamping device and the point of common connection of the multiple return conductors, seeing U F in Figure AA.3.3.2 Energy efficiency Addition: 3.2.101 specific energy consumption e ratio of the total amount of electric energy measured at the input of the supply line, which is consumed by an electroheating installation for melting the charge in normal operating conditions agreed upon between the manufacturer and the user, to the weight of the ingot produced Note 1 to entry: The specific energy consumption is expressed as kWh/kg. 3.3 State and parts Additions: 3.3.101 continuous operation of a furnace operation during which the solid ingot is produced and solidified and the consumable electrode is progressively added during the whole process 3.3.102 steady state of an electroslag remelting furnace state of a furnace in which, in continuous operation, electrical and thermal parameters have reached relatively constant values