Oriented electrical steel sheet and method for manufacturing same

A grain-oriented electrical steel sheet, comprising:

• grooves including a bottom portion and a side portion and positioned on a surface of the electrical steel sheet;
• a metal oxide layer extending on the surface of the electrical steel sheet into regions of the grooves;
• and
• an insulating layer positioned on the metal oxide layer, and extending on the surface of the electrical steel sheet into the regions of the grooves,
• wherein the grooves include normal grooves and defective grooves,
• thicknesses of the metal oxide layer positioned on the bottom portion and the side portion in the normal grooves exceed 0.5 μm, and thicknesses of the metal oxide layer positioned on the bottom portion and the side portion in the defective grooves are 0.5 μm or less,
• the insulating layer positioned on the normal grooves has a thickness of 0.5 μm or more and less than 1.5 μm,
• the insulating layer positioned on the defective grooves has a thickness of 1.5 to 10 μm,
• the bottom portion of the grooves is a depth portion of 0.7 or more of an entire depth of the grooves, and the side portion of the grooves is a depth portion of less than 0.7 of the entire depth of the grooves,
• the thicknesses of the insulating layer positioned on the defective grooves are thicker than the thicknesses of the insulating layer positioned on the normal grooves, and
• the thickness of the insulating layer on the side portion is less than 20% of the entire depth and the thickness of the insulating layer on the bottom portion is 20 to 80% of the entire depth.