EMTP is an acronym for Electromagnetic Transients Program. It is a software tool used by power systems engineers to analyse electromagnetic transients (generically \"EMT\") and associated insulation issues.
In 1964 in his Ph.D. thesis (Technical University of Munich), Dr. Hermann Dommel used Nodal analysis with the companion circuit model and the constant-parameter transmission line model, to simulate electromagnetic transients. The companion circuit model used the trapezoidal integration rule. At that time Bonneville Power Administration also started to develop a computer software for studying switching overvoltages for insulation coordination. In 1966, Hermann Dommel was invited to BPA from Germany to work on the development of a software named Electromagnetic Transients Program (EMTP). The EMTP development was part of a project for the development of load-flow and stability analysis software at BPA. This project was directed by W. F. Tinney whose fundamental contributions to the solution of sparse matrices enabled EMTP and other packages to simulate large power systems.
In 1984 BPA left the DCG and W. Scott Meyer continued independently and personally developing with the existing EMTP code under the new name EMTP-ATP in his free time. ATP is acronym of Alternative Transients Program being non-commercial and royalty-free version of EMTP. EMTP-ATP was then in 1987 available in Europe distributed by Leuven EMTP Center at the KU Leuven (Katholieke Universiteit) as the first EMTP version running under operating system DOS on IBM XT/AT and compatible personal computers.
Abstract:Experimental and computer investigations were conducted into long-duration impulse current distribution in the lightning protection system, supplying network, and electrical installation of a test house that was equipped with household appliances. Long-duration impulse currents simulating lightning continuing currents were injected from the unique current generator into the test object. The current distributions in the elements of the test object were measured using current shunts, coaxial cables, and digital oscilloscopes, then they were modeled using the ATP-EMTP software package. The obtained results show a quite good agreement between the measured and computed current waveforms. The relationships between the values of currents at different points of the conductive installation are similar, as reported in previous studies on the fast-changing lightning return stroke component distribution, although the efficiency of the lightning protection system (LPS) is a few percent better for the long continuing current component in the case of a strongly conductive ground at the test site in Huta Poręby, part of the Rzeszów University of Technology. Due to the relatively low content of high-frequency components in the long continuing current spectrum, the waveshape of this lightning component is practically the same throughout the entire tested installation.Keywords: lightning protection system; lightning continuing current; electrical installation; impulse current generator; test site measurements and modeling
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ATPDraw is only a pre-processor to the ATP package which requires a licence. A separate post-processing tool is also required. ATPDraw can be set up to execute ATP and a plotting program directly via ATPATP Connection (F10). A licence for ATP can be obtained free of charge from the EEUG organization.
This event brings together power system experts, software users, the EMTP marketing/support team and the EMTP developers.This meeting is a unique opportunity, for you to:Share experience and discuss about power system transientsExchange solutions and best practices around simulation topicsDiscuss your challenges and get expert advice from the EMTP specialistsExchange ideas and get inspired by success stories
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This paper proposes an algorithm for detecting and locating winding-to-ground faults using a wavelet transform and BPNN. To evaluate the performance of the algorithm, the ATP/EMTP software30 was used to simulate a power transformer and generate fault signals in a system modelled on an actual EGAT two-winding three-phase transformer in Thailand. Figure 1 shows a simplified flowchart of the proposed algorithm, which can send signals to a trip relay and locate a fault in a power transformer winding. The algorithm uses the current waveform obtained from monitoring units on windings of various sizes and applies a discrete wavelet transform (DWT) to extract the coefficients of the first scale. The comparison coefficient is used as the input for training the neural network. Suitable combinations of activation functions for the hidden layers and output layer of the BPNN are also selected.
The ATP/EMTP software30 was used to simulate the system signal under normal and fault conditions (sampling rate: 200 kHz, sampling time: 5 μs) The substation used in this case study was modelled after a portion of the 115 kV EGAT transmission system that is connected to a 23 kV Provincial Electricity Authority (PEA) distribution line. The power transformer used in this substation is a two-winding, three-phase step-down transformer (50 MVA, 115/23 kV); the configuration and specifications supplied by the manufacturer37 were used. Figure 4 shows a single-line diagram of the power transformer and connected components. In addition, the configuration of the parameter in power transformer that using in the case study can be summarize as shown in Table 1. A thorough simulation was performed to evaluated the proposed algorithm under various conditions. The parameters of the simulations are as follows.
Faults in power systems significantly affect the current signal, which thus can be used to determine whether a fault has occurred in the system. Thus, the proposed fault detection algorithm is based on the application of the DWT to the three-phase current waveform obtained from measurement devices on both the primary and secondary sides of the power transformer. Figures 5 and 6 show examples of the three-phase current signal obtained from the primary and secondary sides for a fault from winding phase A to ground in the primary (high-voltage) winding and secondary (low-voltage) winding, respectively, using the ATP/EMTP software30. 153554b96e