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or m ati er In f in g d an Sch o le of E ctrica l ol on En gi n e UNIVERSITY OF THE WITWATERSRAND Private Bag 3, WITS 2050, South Africa - Telegram “Uniwits” - Telex 4-27125SA - Telephone (011) 717 7111 ELECTRIC POWER RESEARCH GROUP Electric Power Research Group School of Electrical and Information Engineering Private Bag 3 WITS 2050 South Africa Tel: (011) 717 7237 Fax: (011) 403 1929 email: [email protected] ref: PROTEC Z.pdf Impulse voltage and harmonic voltage distortion tests for the ‘PROTEC Z’ unit Prepared for: Dr. Roger Billiet Northern Technologies Prepared by: N. J. West and I. R. Jandrell Date of report: April 29, 2011 Notes • The results presented apply only to the units tested, with or without modifications as noted in the report. • Presentation of test results in this report does not imply approval by the University of the product(s) tested. The results may, however, be used in promotional material as proof of performance by the customer, but only as presented and explicitly stated in this report 1 Introduction A ‘PROTEC Z’ unit was subjected to the following tests: • Application of a fast voltage transient (0.5 µs rise time) with a maximum peak of 3 kV. • Voltage harmonic distortion for 3rd, 5th, 7th, 10th and 15th harmonic of 50 Hz, while keeping the voltage constant at 40 V. Each phase was tested and the value of the capacitance was recorded after each test. The capcitance was measured by means of an RLC meter. 2 Voltage impulse tests A voltage impulse generator was used to generate the required voltage waveform. A typical open circuit voltage waveform can be seen in Figure 1. From the figure, it can be seen that the waveform has a rise time of about 0.5 µs. Figure 1: Typical open circuit voltage impulse waveform Impulses of increasing peak voltage were applied to each phase of the device and the capacitance before and after each test was measured. Impulses with a peak voltage of 1,2 and 3 kV were applied. The results obtained can be seen in Table 1. A typical output waveform can be seen in Figure 1. 1 Table 1: Voltage impulse tests Phase 1 1 1 2 2 2 3 3 3 Applied voltage [kV] 1 2 3 1 2 3 1 2 3 Output voltage [V] 300 530 730 330 530 730 370 560 680 Capacitance before [nF] 521 521 521 524 524 524 520 520 520 Capacitance after [nF] 521 521 521 524 524 524 520 520 520 Figure 2: Typical output waveform for an 3 kV applied impulse 2.1 Harmonic distortion tests In these tests, each phase of the device was subjected to 7.5% THD (Total Harmonic Distortion) of the supplied voltage waveform for the following harmonics: 3rd, 5th, 7th, 10th and 15th. The corresponding frequencies can be seen in Table 2. The voltage was kept constant at 40 V throughout 2 the tests. The before and after capacitance was measured for each test. The results of the harmonic distortion tests can be seen in Table 3. In Figures 3 and 4 typical waveforms obtained during these tests are shown. In these figures, the voltage applied to each phase and the current drawn can be seen. Table 2: Harmonics for f =50 Hz Harmonic 3 5 7 9 10 15 Frequency [Hz] 150 250 350 450 500 750 Max current drawn [mA rms] 21 34 48 61 68 102 Table 3: Harmonic voltage distortion test results Phase Harmonic Duration [hours] 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 3 5 7 9 10 15 3 5 7 9 10 15 3 5 7 9 10 15 4 1 1 0.5 0.5 0.5 4 1 1 0.5 0.5 0.5 4 1 1 0.5 0.5 0.5 3 Capacitance before [nF] 521 521 521 521 521 521 524 524 524 524 524 524 520 520 520 520 520 520 Capacitance after [nF] 521 521 521 521 521 521 524 524 524 524 524 524 520 520 520 520 520 520 Figure 3: 3rd harmonic: Voltage and current waveforms Figure 4: 15th harmonic: Voltage and current waveforms 4 3 Conclusion Fast rise time and voltage harmonic distortion tests were conducted on the ‘PROTEC Z’ unit. The voltage impulses applied had a peak of 3 kV maximum, and 3rd, 5th, 7th, 9th, 10th and 15th harmonic voltages were applied to the device. Each one of the three phases of the unit were tested. The tests indicated that the capacitance of each phase capacitor did not change after each test. N. J. West, MSc(Eng), PhD I. R. Jandrell, PhD, PrEng 5