A Method for Automatic Tracking and Adjustment of Harmonic Elimination Resistor
It is a technology of harmonic elimination resistance and automatic tracking. It is applied in circuits, electrical components, and electrical component structure associations. It can solve single-phase grounding, power frequency resonance protection dead zone, inability to distinguish single-phase grounding and power frequency resonance, and voltage mutual inductance. It can eliminate the problems of overload and burnout of the voltage transformer, and achieve the effect of eliminating the burning of the voltage transformer, eliminating the protection dead zone, eliminating the resonance and resonance overvoltage.
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Embodiment 1
[0066] It is known that K=1.9, S=50VA, the maximum operating voltage of the system is less than 1.1 times the rated voltage, and the long-term operation is at the open triangle voltage U △ =5V, at T1 time U △ mutation to U △ =80V, at T2 time U △ back to U △=100V, at T3 time U △ back to U △ =5V, automatically track the open triangle voltage to adjust the harmonic elimination resistor with the method of the present invention.
[0067] Since the maximum operating voltage of the system is less than 1.1 times the rated voltage, that is, λ 2 =1.1, and take λ 1 =1.1, according to formula (6), in U △ = Harmonic elimination resistor R at 5V X =2.02 ohms, take R 5 = 2.5 ohms; U △ = Harmonic elimination resistor R at 80V X = 55.57 ohms ohms, take R 80 = 56 ohms; U △ = Harmonic elimination resistor R at 100V X =77.19 ohms, take R 100 = 78 ohms.
[0068] First in the system long run in U △ When =5V, the resistance across the open triangle is R X = R 5 = 2.5 ohms; U is me...
Embodiment 2
[0070] It is known that K=2.5 and S=50VA. Since it is a terminal substation and a remote pump station substation with long line power supply and load instability, the capacitance effect of the system is very serious. When there is no load, the voltage is very high, so the system runs The maximum voltage is less than 1.2 times the rated voltage, long-term operation at the open triangle voltage U △ =0V, at T1 time U △ mutation to U △ =70V, at T2 time U △ back to U △ =100V, at T3 time U △ back to U △ = 0V, automatically track the open triangle voltage to adjust the harmonic elimination resistor with the method of the present invention.
[0071] Since the maximum operating voltage of the system is less than 1.2 times the rated voltage, λ is taken as 2 =1.2, according to formula (7), in U △ = Harmonic elimination resistor R at 0V X =0 ohm, when the open triangle can no longer be monitored by shorting the open triangle, take R 0 = 1 ohm; U △ = Harmonic elimination resistor...
Embodiment 3
[0074] It is known that K=1.9, S=50VA, the maximum operating voltage of the system is less than 1.1 times the rated voltage, and the long-term operation is at the open triangle voltage U △ =5V, at T1 time U △ mutation to U △ =80V, at T2 time U △ back to U △ =100V, at T3 time U △ back to U △ = 60V, at T4 time U △ back to U △ =5V system returns to normal.
[0075] The maximum operating voltage of the system is less than 1.1 times the rated voltage, that is, λ 2 = 1.1, λ 1 =1.1, according to the open triangle voltage is divided into 6 sections N=6, according to formula (9) to obtain R i , corresponding to parameter U Δi , I i See Table 1.
[0076]
[0077] Long run under U △ =5V, the harmonic elimination resistor works in the first section, the harmonic elimination resistor R X = R 1 = 8 ohms. U is detected at time T1 △ mutation to U △ =80V>U Δ1+ =10V, adjust the harmonic elimination resistor to U △ = 80V corresponding to the fifth segment resistance R X =...
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