IEC 60779-2020 Installations for electroheating and electromagnetic processing – Test methods for electroslag remelting furnaces.
4 Basic provisions for testing and test conditions
Clause 4 of IEC 60398:201 5 is applicable.
5 Comparing equipment or installations
Clause 5 of IEC 60398:201 5 is applicable.
6 Measurements and workloads
Clause 6 of IEC 60398:201 5 is applicable except as follows.
6.4.3 Measurement positions
For measurement positions of all electrical parameters of the power circuit of electroslag remelting equipment, see Figure AA.1 -Figure AA.3, being at output terminals of supply disconnecting device for the electric consumption measurement of the power circuit, and at the output terminals of the power distribution cabinet in shop for other electrical and mechanical auxiliaries (see 4.3 of IEC 60398:201 5).
7 Numerical modelling
Clause 7 of IEC 60398:201 5 is applicable.
8 Technical tests
Clause 8 of IEC 60398:201 5 is applicable except as follows.
8.1 00 Measurement of the effective stroke of the electrode ram motion
The effective stroke of the electrode ram motion is the distance between the upper limited position and the lower limited position of the electrode ram where the motion stops.
The measurement shall be made with a meter ruler when the main power of the furnace is off.
8.1 01 Measurement of the speed of the electrode motion
The measurement shall be made with manual control of the moving system of the electrode in two directions under the condition that the furnace is equipped with the electrode(s) of the largest weight and length allowed by the designer.
NOTE The measurement can be made by another method, for example, using electric signal control.
The measurement of the speed of motion shall be carried out by means of a stop-watch (or electronic time-base control), noting the distance covered by the electrode arm relative to its fixed support.
8.1 02 Measurement of the time interval for exchanging electrodes
The purpose of this test is to check if the time interval for exchanging electrodes meets the requirements agreed between the manufacturer and the user when the furnace is equipped with two sets of electrode feed drive systems.
The time to be measured with a stop-watch is the time interval from the moment when the secondary current becomes zero after the first electrode has melted and pulled out of the molten slag to the moment when the next electrode is dipped into the slag pool and the secondary current flows in the circuit.
8.1 03 Measurement of the open-circuit secondary voltage of the electroheating installation
This test shall be carried out across the melting power supply terminals (see item 6 in Figure AA.1 ).
If the installation is provided with a regulation system, the minimum and the maximum opencircuit secondary voltages shall be measured.
8.1 04 Measurement of the electrical parameters of the secondary circuit of the electroheating installation
8.1 04.1 General
The purpose of this test is to check if the characteristics of the secondary circuit of the furnace meet the requirements agreed between the manufacturer and the user.IEC 60779 pdf download.