A description of the importance rate change frequency (ROCOF) measurements to operation electricity networks is given. The susceptibility ROCOF common power system disturbances such as phase steps described. measurement campaign observe at multiple locations in an island grid dominated by renewable generation described and some results are These captured events those associated with steps, which occur without significant underlying frequency. It concluded that they constitute a "false"...

The motivation for harmonic propagation measurements in distribution grids is given. An island site with substantial renewable generation and smart grid elements chosen as a measurement campaign, the description of network demographics infrastructure including set GPS synchronized digitizers, transducers, data collection communication described. A selection results analyzed presented power amplitude phase between sites also at fundamental frequencies. Interpretation against simplified models...

Frequency-dependent network impedance (FdNI) is a crucial aspect of electromagnetic compatibility coordination. In low voltage (LV) networks, reference characteristics are commonly used to represent FdNI in the frequency range 2-150 kHz. These essential for credible regulatory regime, but they based on studies conducted several decades ago. This paper presents results comprehensive study that aims validate suitability impedances representing current public LV networks. The draws conclusions...

Accurate values of transmission line impedance parameters can enhance the efficiency and reliability power system operation. The parameter be calculated using synchronized phasor measurements voltage current at ends. objective this paper is to investigate how accuracy uncertainty depends on level noise distortion in measured signals during different loading conditions. investigation conducted a laboratory-based model measurement system. details test operation are presented paper.

The importance of Power Quality (PQ) to the operation and management electrical power networks is described. A discussion given on propagation PQ phenomena. Preparations for a measurement campaign using multiple GPS synchronised digitisers associated transducers an island operating with high renewable penetration (Smart Grid) are Results from this will be used formulate models that can plan manage future Smart Grids.

Recently several European National Measurement Institutes have established traceable calibration methods for dynamic mechanical quantities, e.g., force, torque and pressure. However, the use in industry elsewhere of information provided on certificates is not straightforward. Typically it necessary to employ deconvolution techniques obtain estimates measurands, method itself associated algorithms are sources uncertainty that must be included budgets. There a need practical guidance end users...

Currently, there is no global, open data or network management standard in the telecommunications power sector. There a growing awareness that this represents significant cost to telcos and asset managers. This may be measured both capital, deployment operating costs as well indirect future costs. The cost-effective of real time monitoring information universal problem impacting all telcos. paper will outline kinds flow telepower energy systems how an could provide savings encourage wider...

The importance of rate change frequency (RoCoF) measurements in electrical power grids is discussed along with its measurement challenges. A campaign a renewable-rich grid to compare ROCOF algorithms variety configurations at multiple locations presented. An example captured event given.

This paper presents a strategy for the description of new test waveforms static electricity meters to be included in international standards. The need extending existing standardisation frame arises from several recent studies that have reported conducted electromagnetic interference problems type-approved meters, resulting significant errors measured consumption. proposed method is based on discrete wavelet transform and allows compact parsimonious representation waveforms, suitable...

The IEC technical report 61000-4-37 describes methods to verify that compliance systems measure 61000-3-2 and work within their specified tolerances. waveforms required for these tests have a rich harmonic content. This paper technique produce harmonics using programmable microcontroller controlling an insulated-gate bipolar transistor. results are shown any differences between the explained.

A high frequency power transformer (HFPT) with twin secondaries is generally analyzed each primary ampere-turn being canceled by an equal contribution from of the two secondaries. Such a methodology does not indicate worst case losses. This paper analyzes under number interleaving sequences. Each sequence five loading conditions. Under different conditions ampere-turns are unequal It shown that losses occur when there extreme unbalance between secondaries.< <ETX...

The importance of impedance measurements in electricity grids at harmonic frequencies is discussed along with the measurement challenges. potential use infrequent disturbance events such as transients for signals to excite circuit discussed. A method based on two phasor units then presented preliminary laboratory results.

The IEC draft technical report 61000-4-37 describes methods to verify that compliance systems measure 61000-3-2, work within their specified tolerances. waveforms required for these tests have a rich harmonic content. paper technique produce harmonics using programmable microcontroller controlling an insulated-gate bipolar transistor. initial results are shown and the developments fully match explained.

This paper describes a method of isolating high resolution digitizers which have common ground for different channels, so the can be used simultaneously with current shunts and resistive voltage dividers in wideband power meters. The isolators sufficient amplitude stability up to 100 kHz static meter testing. when switch formation provide cancel out phase angle errors trying measure difference angles between channels.

The frequency range from 9 kHz to 150 is still lacking a complete normative measurement framework. At the moment, it not fully clear how well measurements of equipment emissions performed in laboratory environment compare with measured real low voltage networks, mainly due different impedance conditions. This paper addresses this issue by presenting comparison selected set appliances on-site network same appliances. Several laboratories participated comparison, and locations have been taken...

This article describes a method of isolating high-resolution digitizers that have common ground between channels.Isolation enables the to be used simultaneously measure multiple points in circuit without shortcircuiting via ground.The isolators, when switch formation, provide cancel out phase angle errors measuring difference angles channels.Various tests are reported, which assess performance isolator over its operating range.These include temperature coefficient, linearity, gain stability...

There is an increasing need to measure the increase in voltage harmonics associated with power convertors used low carbon technologies. Existing transformers (VT) for protection and measurement are often repurposed harmonic monitoring despite only being characterised at 50 Hz. Previous research has shown that VT ratio phase angle between primary secondary windings a frequency dependant characteristic. This paper reports testing of five VTs, typically UK distribution networks, voltages up 5...

This paper presents the results of a long-term measurement campaign grid voltage distortion in 9 kHz to 150 frequency range, performed United Kingdom. The measurements have been with specially build instrument, whose specifications are provided paper. Moreover, location is newly built low-carbon site, which offers an insight into modern low-voltage distribution networks. obtained compared applicable compatibility levels provide indication on distortion. expands experience power quality...

The growing penetration of inverter-based technologies in the low-voltage (LV) grid, such as electric vehicle charging stations or photovoltaic panels, has increased presence high-frequency disturbances 2–500 kHz band. Currently, there is not a fully defined regulation for characterization conducted distortions this This contribution analyzes current measurement framework band based on existing standards. For purpose, impact results characteristics and configuration methods maximum levels...

This paper presents voltage distortion measurements in the 9 kHz to 150 frequency range at sites with ultra-rapid EV chargers. The caused by Electric Vehicle Charging Station (EVCS) chargers if left unrestrained may damage other nearby equipment installed on network, therefore standardized measurement of is crucial prevent this harm. One potential candidates as a standardised method was applied and results for one briefly exceeded compatibility levels defined IEC 61000-2-2. Tools describe...