Overheat of major HVPS Components, 0C.

Overheat of major HVPS Components, 0C

Load power, kW
Transistor baseplate
FWD baseplate
HV tank (bulk oil)

100 (4 modules)
25
23
42

90 (3 modules)
27
10
38

 
Apparent (Pinapp) and active (Pinact) input powers, load power (PI), efficiency, and PF at norminal line for 100 kΩ load
shows the experimental data on the power measurements obtained at the nominal line. In accordance with the information and simulations derived from the work with the single module, the overall efficiency is 95 percent at full load and is greater than 90 percent at 20 percent load. The PF was also satisfactorily high. At high and low lines, the measurements yielded very similar results. At higher resistance load, the efficiency and PF were virtually the same.
The long-term runs at 100 kV have been performed up to a power level of 100 kW which is the average continuous power. In order to establish the overload capability, the HVPS was also run with three modules at 88.4 kV, 90 kW, and in a pulsed mode. Conservative overheat of the major HVPS components was observed. For the nominal line, the results are summarized in Table I. The HVPS was also tested in a pulsed mode, mainly with the goal of validating the lifetime of the main insulation. The HVPS-generated 110-kV rectangular pulses with a period of 0.8 s and a pulse width of 0.2 s across an 88.5-kΩ load, which corresponds to 137-kW peak power and 34-kW average power, respectively.
Additional pulse tests were made with a capacitive load imitating large ESP fields. With this purpose, a 0.4-μF capacitor was connected across a 180-kΩ load. The experiments were conducted at a repetition rate of approximately 0.2 Hz. The rise time from zero to 100 kV was 20 ms. The unit was also tested for spark/arc withstand capability. It was repetitively shorted shorted to ground at full voltage. No damage was sustained, also after intermittent sparking in the course of the tests. We note that the arc/spark protection is provided by a proprietary R−L network limiting the current derivative and amplitude without significant power dissipation in this network that is less than 10W in normal operation.

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