Specific installation method of electric part of induction melting furnace

The installation of the electrical part includes the installation of a high voltage cabinet (or high voltage load switch), a rectifier transformer, a KGPS intermediate frequency power supply cabinet, an RFM compensation capacitor cabinet, and a low voltage power cabinet. Installation must be done in the following order:

The intermediate frequency furnace is in place:

The intermediate frequency furnace should be in accordance with the layout plan provided by the design institute or the manufacturer, and the adjustment level and size should meet the relevant drawing requirements.

Intermediate frequency furnace fixed:

The rectifier transformer should be placed on the base rail accurately and fixed.

After the other electric intermediate frequency furnace is in place, it needs to be watered twice, then hang the anchor bolts, water the cement, and fasten the anchor bolts after the health; if it is not required to be watered twice, fix the anchor bolts at the anchor holes. .

Main electrical connection between intermediate frequency furnaces:

The connection between the high voltage 10KV and the high voltage switchgear (or high voltage load switch) is made of high voltage cable, high voltage cable overhead or along the high voltage cable trench, from the factory high voltage distribution room to the high voltage switchgear (or high voltage load switch); high voltage switchgear The connection between the (or high-voltage load switch) and the rectifier transformer is made of a high-voltage cable or a copper busbar of the same cross-section, and the cable (copper busbar) is to be fixed.

The connection between the rectifier transformer and the KGPS intermediate frequency power supply, the KGPS intermediate frequency power supply cabinet and the RFM compensation capacitor cabinet is an overhead copper busbar, and the copper busbar should be fixed.

The connection between the compensation capacitor cabinet and the water-cooled cable of the furnace body should use the overhead water-cooled copper busbar due to the relatively large current. The distance between the water-cooled copper busbars is “80mm to reduce the influence of the tank inductance on the start of the intermediate frequency power supply; the water-cooled copper busbars are separated by 1500mm. Fix it at a fixed point. The metal part of the fixing bracket should be away from the copper busbar (d>200mm) to reduce the induction heating of the metal body by the intermediate frequency.

The principle of selection of the main electrical connection fastening bolts:

a) The power frequency is 50Hz or the DC part is made of copper bolt (or galvanized steel bolt)

b) Copper bolts are used for the power frequency of 500Hz (non-magnetic stainless steel bolts 1Cr18Ni9Ti)

3.5 Color selection principle of main electrical copper busbar color standard paint:

a) Three-phase power supply A----yellow; B-phase----green; C-phase---red

b) Intermediate frequency power supply----black

9.2.4. Control electrical connection between intermediate frequency furnaces:

9.2.4.1 Distribution cable

a) The connection between the workshop power distribution room and the low-voltage power cabinet adopts three-phase four-wire power cable with a capacity of 30KVA;

b) The low-voltage power cabinet is divided into the electric furnace, the water cooling system and the intermediate frequency power supply using three-phase four-wire cable.

Control Cable

The control cable for electrical signal communication between the intermediate frequency furnaces shall be multi-core control cable, and all control cables shall be buried in the cable trench or placed on the wall through the threading pipe. The threading tubes are fixed by 1 meter apart.