Access to EMTP user presentations, webinars, and slide deck presentations.
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3 presentations for harmonics:

Analysis and Calculations in Medium Voltage Electrical Systems833
Abstract
The electrical installation of an industrial site is a complex structure. Analyzing behavior in a transient condition allows optimum selection of the operation and protection devices in the installati... see moreon design phase; in addition, possible weaknesses and critical points can be highlighted in advance, allowing prevention of potential problems, damage to machinery, and costly periods of down time.
In order to completely satisfy the needs and expectations of the customer, in ABB Electrification Business an important role is played by analyses and consulting services offered by Field Application Support (FAS) specialist.
In this session of the "EMTP User conference", representatives from the Italian ABB Distribution Solution division, based in Dalmine (BG), will show how EMTP tool supports the analyses performed within the "Medium Voltage Circuit Breaker Suitability" reports that are provided to customers looking for switching devices for special applications. In particular, the today presentation will focus on "CB suitability" study approach for the Generator Circuit Breaker and the Filter Harmonics switching applications
Tag(s): TRV, generator breaker, filter, switching

Impact of Power Transformer Energization on Relay Protection Operation844
Abstract
One of the main causes of the incorrect operation of transformer relay protection are inrush currents. The transient inrush current occurs when energizing the unloaded transformer, and it is a consequ... see moreence of the transformer core saturation. This paper presents analysis of transients caused by energization of 300 MVA three-phase autotransformer with stabilizing winding and voltage ratios 400/115/10,47 kV.
Using the PAMSUITE Toolbox in EMTP, many simulations were performed to show the impact of model’s parameters on the amplitude and duration of inrush currents as well as the probability of 2nd harmonic differential current amplitude occurrence. Simulation results show that controlled switching reduces inrush currents amplitudes and increases 2nd harmonic content in differential currents. A Protection Toolbox in EMTP was used for modelling CT saturation and operation of transformer’s differential protection relay.
Based on the simulation results the optimal differential protection settings were determined, and the probability of false relay protection operation was calculated.
Tag(s): transformer, energization, inrush, differential, protection, harmonics, bctran, pamsuite

Design and Performance Assessment of Harmonic Filters Using EMTP835
Abstract
In order to permit access to a public electricity network, a network operator will impose compliance with certain technical requirements, which must be met by the potential network user seeking the co... see morennection to the network.
These technical requirements are typically quite extensive and detailed and generally include requirements for compliance with power quality standards, including harmonic distortion standards. As a result of the requirement to comply with harmonic distortion standards and the requirements therein, it is sometimes necessary to provide harmonic filtering in order to ensure the public network will remain within the required harmonic distortion limits under all normal operating conditions.
This presentation gives a study case for a connection to a 400kV network which required design and installation of a number of filters in order to ensure compliance with the harmonic distortion limits on the public network.
As part of the assessment and design process, a number of studies was undertaken in order to ensure all aspects of the filter system design perform as required, under all operating conditions. These studies included:
• harmonic propagation and distortion calculations,
• filter configuration and optimisation studies,
• filter loading studies,
• filter transient studies,
• filter protection studies.
The tool used in the assessments was EMTP. The presentation will demonstrate certain aspects of the EMTP capability and use in steady state and electromagnetic transient studies applied to the filter system design, validation and compliance studies.
Tag(s): railway, traction, power quality, harmonics, scripting