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The paper deals with an analysis of transmission line wave properties and their influence on the voltage wave propagation in the system EHV/UHV consisting of a transmission line and a grid transformer where a gas-insulated switchgear (GIS) are set up. Switching on/off operations in the GIS generate pulses with very short rise time it results in travelling wave phenomena which are depending on the...
The increased application of HVDC components in electrical energy systems has led to new challenges in diagnostic testing and measurement of electrical insulation. In addition to other diagnostic methods Partial Discharge (PD) diagnosis at DC voltage is currently subject to much discussion worldwide. This is because the established and approved procedures, methods and evaluation techniques at AC voltages...
The high voltage diagnostics must follow the actual state of the industry devices and the problems related to diagnostics methods. One of the diagnostic methods necessary to be solved at this time is the partial discharge detection, diagnostics and analyses in HVDC systems. There is no standardized method for detection of partial discharges in HVDC systems supplied with DC voltage. The presented study...
The paper deals with basic investigation of AC breakdown behaviour of gaseous insulation with synthetic air at different level of field homogeneity and gas pressure. The measurement was performed at different gas pressure ranging from 0.1 to 0.25 MPa and gap distances from 1 to 9 cm, using an electrode test-set “tip-bowl”. The test parameters were chosen in such a way that different field types could...
For testing of high voltage (h.v.) components under so-called unconventional frequency test conditions as h.v.-test source very often static frequency converters (SFC) were applied. A typical example for that is the testing of power transformers at higher frequency. In the past this test was provided by standardized motor-generator sets, but more and more alternative power sources having SFC-units...
The knowledge of stochastic breakdown behaviour of environmental friendly gas mixtures become more and more important with respect to the required replacement of SF6 - insulated apparatus. To obtain the necessary withstand values of breakdown voltage at the variety of desired parameters a statistical treatment of the measured data is required. The paper deals with the estimation of these values typical...
There are discussed the adequate problems to estimate the partial discharge (PD) behavior of typical PD arrangements under AC and DC conditions n the paper. The investigations were performed using typical PD test arrangements, corona, gliding and internal PD. For estimation of the PD behavior the standard phase resolved characteristics and PSA characteristics were used.
The PD behaviour of so-called basic test arrangements as for corona discharge or other discharge sources seems to be well known from the physical point of view. On the other hand the measurement results and, in the same manner, their identification and interpretation can be different, because this is depending on the measurement or evaluation conditions. Therefore some typical basic arrangements representing...
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