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The Technical Report IEC/TR 61000-3-13:2008 provides guiding principles for coordinating voltage unbalance between various voltage levels of a power system through the allocation of emission limits to installations. This report is based on widely accepted concepts and principles in relation to voltage unbalance. With regard to some of the key ideas used in this report, investigations have been carried...
The 2010 Annual Planning Report (APR) of Transpower New Zealand, the owner and operator of the New Zealand (NZ) grid, has indicated a capacity issue in the Wellington 110 kV load area particularly after standing down the inter-island HVDC Pole 1 in late 2007. Presently, the HVDC link is coupled with the Wellington 220 kV AC network, and thus the capacity into the 110 kV load area is dependent on the...
Identification of principal contributors to voltage unbalance and hence the implementation of suitable corrective measures has become an issue of concern for some network providers. In order to comply with stipulated limits, these network service providers require the development of quantitative measures that are reliable. For simple radial networks, the identification of sources may be seen as a...
The International Electrotechnical Commission (IEC) has introduced approaches for managing continuous power quality disturbances (harmonics, flicker and voltage unbalance) in power systems through the allocation of emission limits to customer installations, which are based on a common philosophy. However, it has been found that these harmonics and flicker allocation methods lead to planning levels...
The International Electrotechnical Commission (IEC) has recently released the Technical Report IEC/TR 61000-3-13 for the assessment of voltage unbalance emission limits to individual customer installations connected to medium-voltage (MV), high-voltage, and extra-high-voltage power systems. As in the counterpart IEC technical reports for harmonics (IEC 61000-3-6) and flicker (IEC 61000-3-7) allocation,...
The levels of voltage unbalance which exist in some interconnected sub-transmission systems in Australia have been observed to exceed the stipulated levels. The causes of the problem are not well known to system operators, i.e. whether the problem mainly arises as a result of system asymmetry or loads or both. Hence, system operators have found difficulties in identifying potential mitigation approaches...
Guidelines for developing voltage unbalance emission limits for installations connected to EHV, HV, and MV power systems have recently been published as a technical report by the International Electrotechnical Commission (IEC). These guidelines, based on the work of Joint Working Group CIGRE/CIRED C4.103, are intended to provide a common basis for the development of similar guidelines or standards...
The International Electrotechnical Commission (IEC) has recently released a technical report (IEC/TR 61000-3-13, Ed. 1.0, 2008) in relation to the assessment of voltage unbalance emission by installations connected to MV, HV and EHV power systems. As in the cases of harmonics and flicker, this requires a quantitative measure of propagation of voltage unbalance from upstream (higher voltage) to downstream...
The levels of voltage unbalance that exist in some interconnected sub-transmission networks in Australia has been observed to be above the code requirements (e.g. 1% in Victoria). There is a perception that these high levels arise as a result of asymmetrical loads. However, it is identified that the network asymmetry in relation to transmission lines also play a significant role in the lead up to...
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