Extension and optimization of the load range of DRT test systems for testing extra-long HV and UHV cables

Quasi optimal feedforward control of a very low frequency high-voltage test system

“…Because of this, a new type of cable test method with very low frequencies (VLF) in the range of 0.01 Hz to 0.1 Hz was recently established, which reduces the amount of reactive power and, therefore, the size and weight of the test devices, see Putter et al (2012); IEEE Power Engineering Society (2004); Pietsch and Hausschild (2005); Krüger et al (1990); Muhr et al (2001); Coors and Schierig (2008). The company Mohaupt High Voltage GmbH developed a new type of VLF test system based on the so called Differential Resonance Technology (DRT), which allows a mobile VLF testing of cables up to 500 kV rms and higher, see Mohaupt et al (2012); Mohaupt and Bergmann (2010). The functional principle of this new test system is depicted in Figure 1.…”