Patent ID: 11892495
Assignee: LS ELECTRIC CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G  H

Claim 9:
10. The insulation monitoring device of claim 9, wherein the control unit is configured to:
determine, when the primary tuning is terminated, the starting time point of the primary tuning, a point of time that the initial sampling interval has elapsed from the starting point, the termination time point of the primary tuning, a point of time before the initial sampling interval from the termination time point of the primary tuning, as the reference points, to calculate the slope ratio according to Equation below based on the determined reference points, First
       ⁢
          
       slope
      
      =
      
       
        
         Second
         ⁢
            
         voltage
        
        -
        
         Starting
         ⁢
            
         voltage
        
       
       
        
         Second
         ⁢
            
         reference
         ⁢
            
         point
        
        -
        
         Starting
         ⁢
            
         point
        
       
      
     
    
   
   
    
     [
     Equation
     ]
    
   
  
 

 
                  
  
   
    Second
    ⁢
       
    slope
   
   =
   
    
     
      Third
      ⁢
         
      voltage
     
     -
     
      First
      ⁢
         
      voltage
     
    
    
     
      third
      ⁢
         
      reference
      ⁢
         
      point
     
     -
     
      First
      ⁢
         
      reference
      ⁢
         
      point
     
    
   
  
 

 
                  
  
   
    Slope
    ⁢
       
    ratio
   
   =
   
    
     Second
     ⁢
        
     slope
    
    
     First
     ⁢
        
     slope
    
   
  
 

where the starting point denotes a point of time at which the sampling is started, the first reference point denotes a point of time that an initial sampling interval has elapsed from the starting point, the third reference point denotes the termination time point of the primary tuning, the second reference point denotes a point of time before the initial sampling interval from the third reference point, the start voltage denotes a voltage of the starting point, the first voltage denotes a voltage of the first reference point, the second voltage denotes a voltage of the second reference voltage, and the third voltage denotes a voltage of the third reference point.