Method for realizing digital relay protection anti-time limit characteristic
A technology of relay protection and realization method, which is applied to emergency protection circuit devices, automatic disconnection emergency protection devices, electrical components, etc., can solve the problems of large amount of real-time calculation, high calculation speed requirements, and difficulty in implementation.
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specific Embodiment approach 1
[0005] Specific embodiment one: the following combination figure 1 The present embodiment will be specifically described. The steps of this embodiment are as follows: the relay protection device is powered on 101; the parameters K, r, τ set by the user are read p and I p , the variable X 1 , X 2 Set to zero 102; calculate I separately p r , value of 103; will assign the value to the variable X 1 104; the interval time Δt collects the real-time current I of the protected object j 105; Calculate I j r , then set I j r The value of is accumulated into the variable X 2 , while placing I p r The value of is accumulated into the variable X 1 Medium 106; Judgment variable X 2 Whether the value of is greater than or equal to the variable X 1 The value of 107; if the result of step 107 is no, return to the starting end of step 105; if the result of step 107 is yes, then the inverse time limit protection action 108.
[0006] After the relay protection device is po...
specific Embodiment approach 2
[0013] Embodiment 2: This embodiment is about Embodiment 1 in step 106. j r numerical calculation method. I j r The numerical calculation method is divided into two cases. If r=1 or r=2, the relay protection device can directly perform mathematical calculation; if r=0.02, it is difficult for the relay protection device to directly perform mathematical calculation, so look-up table is used. A method combined with piecewise linear interpolation. In the following, the first embodiment when r=0.02 is described in detail with reference to FIG. 2. In step 106, I j r The calculation process of the value: determine the moment I j The value of satisfies I j ≤I p , I p j ≤8I p or 8I p j ≤20I p Which of the cases 601; if I j ≤I p , that is, the actual current of the protected object is (0-1)I p , then judge I j Is the value listed in the No. 1 data sheet, the No. 1 data sheet step size is 0.01I p , a total of 101 values, these 101 I j r The values of , respectively, ...
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