Patent ID: 11921170
Assignee: MAHDI DAVARPANAH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. The system of claim 10, wherein measuring the variations of the periodic neutral-to-ground voltage comprises:
measuring a first voltage phasor of the periodic neutral-to-ground voltage at a first moment, the first voltage phasor comprising a first voltage amplitude and a first voltage phase;
measuring a second voltage phasor of the periodic neutral-to-ground voltage at a second moment after at least 10 temporal periods of the periodic neutral-to-ground voltage from the first moment, the second voltage phasor comprising a second voltage amplitude and a second voltage phase;
obtaining a first compensated voltage phase by compensating the first voltage phase according to a phase of a positive sequence component associated with electric currents flowing through the plurality of three-phase distribution lines;
obtaining a second compensated voltage phase by compensating the second voltage phase according to the phase of the positive sequence component; and
obtaining the variations of the periodic neutral-to-ground voltage according to an operation defined by the following:, Δ
      ⁢
      
        V
        
          NE
          ⁢
          
            -
          
          ⁢
          p
          ⁢
          u
        
      
    
    _
  
  =
  
    
      
        
          
            V
            
              N
              ⁢
              E
              ⁢
              2
            
          
          _
        
        -
        
          
            V
            
              N
              ⁢
              E
              ⁢
              1
            
          
          _
        
      
      
        
          0
          .
          5
        
        ×
        
          (
          
            
              V
              
                N
                ⁢
                E
                ⁢
                1
              
            
            +
            
              V
              
                N
                ⁢
                E
                ⁢
                2
              
            
          
          )
        
      
    
    ×
    100
  

 where:
ΔVNE-pu represents the variations of periodic neutral-to-ground voltage,
VNE1=VNE1∠ϕNE1 where VNE1 is the first voltage amplitude, ∠ is the angle symbol, and ϕNE1 is the first compensated voltage phase, and
VNE2=VNE2∠ϕNE2 where VNE2 is the second voltage amplitude and ϕNE2 is the second compensated voltage phase.