A Protection Criterion for Zero Sequence Active Component
An active component and zero-sequence technology, applied in the field of zero-sequence active component protection criteria, to achieve the effects of high reliability, simple action criteria, and fast processing speed
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Embodiment 1
[0016] The output of the system transformer is connected to the busbar, the neutral point of the system transformer is grounded through the resistor R, and the busbar has more than two output lines. The three-phase voltage of bus a, b, c is sent to the zero-sequence active component protection device 1 of each output line through the voltage transformer TV, and the zero-sequence active component protection device 1 calculates the bus zero-sequence voltage The zero-sequence current formed by the current transformer TA of the i-th output line Send to the zero-sequence active component protection device of the i-th output line, where i=1, 2, 3,,, n, n is the total number of bus output lines. Each zero-sequence active component protection device 1 microcomputer system for zero-sequence voltage with zero sequence current Carry out calculation and processing, zero sequence voltage with zero sequence current The angle θ between i , each zero-sequence active component prote...
Embodiment 2
[0024] The neutral point of the system transformer 2 is grounded through the resistor R; the three-phase voltage of the bus a, b and c is sent to the zero-sequence active component protection device 1 of each output line through the voltage transformer TV, and the zero-sequence active component protection device 1 calculates the bus zero sequence voltage The zero-sequence current formed by the current transformer TA of the i-th output line Zero-sequence active component protection device 1 sent to the i-th output line, zero-sequence voltage with zero sequence current The angle θ between i , each zero-sequence active component protection device 1 calculates the zero-sequence active power |P i |=|-U 0 I 0,i cosθ i |, when |P i |≥P i,set , the zero-sequence active component protection device 1 operates; otherwise, it does not operate; where: P i,set is the zero-sequence active component protection setting value of the i-th output line, P i,set greater than the possi...
Embodiment 3
[0027] The neutral point of the system transformer 2 is grounded through the resistor R; the three-phase voltage of the bus a, b and c is sent to the zero-sequence active component protection device 1 of each output line through the voltage transformer TV, and the zero-sequence active component protection device 1 calculates the bus zero sequence voltage The zero-sequence current formed by the current transformer TA of the i-th output line Zero-sequence active component protection device 1 sent to the i-th output line, zero-sequence voltage with zero sequence current The angle θ between i , each zero-sequence active component protection device 1 calculates I i =-I 0,i cosθ i , when I i ≥I i,set , the zero-sequence active component protection device 1 acts; otherwise, it does not act; where: I i,set is the zero-sequence active component protection setting value of the i-th output line, I i,set I i |=|I 0,i cosθ i |Maximum unbalance value.
[0028] Compared with...
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