（1） Every year, about 100 million kilograms of electromagnetic wire are wasted due to the maintenance of electric motors nationwide. If 100 million kilograms of electromagnetic wire are produced less (which requires 33.4 kWh of electricity per kilogram), 3.34 billion kWh of electricity can be saved annually.

（2） The calculation formula for the relationship between motor protectors and the economic benefits of enterprises is as follows:

Qs=motor repair cost x protector reliability factor+motor disassembly cost+downtime loss - protector purchase cost - protector installation cost

=(Motor repair cost x Protector reliability factor - Protector purchase cost)+(Motor disassembly cost+Shutdown loss - Protection installation cost)

=(Direct Economic Benefits)+(Indirect Economic Benefits)

For example, there is a 55KW electric motor that costs 2500 yuan to repair if it burns out. A motor protector with a reliability factor of 98% and a price of 490 yuan can be configured to prevent the motor from burning out, resulting in direct economic benefits QZ as follows:

QZ=Motor repair cost × Protector reliability factor - Protector purchase cost=2500 × 98% -490=1960 (yuan)

Direct savings ratio: ρ=1960/2500 × 100%=78.4%

Calculation result: The user's purchase of the motor protector resulted in a savings of 1960 yuan, with a savings rate of 78.4%.

Electric motor power repair cost (approximately) purchasing electric motor protector (motor protector) cost relatively saves costs

10KW900 yuan 350 yuan 550 yuan

20KW1300 yuan, 380 yuan, 920 yuan

30KW 1800 yuan 490 yuan 1310 yuan

60KW3000 yuan, 590 yuan, 2410 yuan

90KW5000 yuan, 690 yuan, 4310 yuan

Note: It is assumed here that the reliability factor of the motor protector (motor protector) is 100%