Parameters Identification and Modeling of High-Frequency Current Transducer for Partial Discharge Measurements

Shafiq, Muhammad; Kütt, Lauri; Lehtonen, Matti; Nieminen, Tero; Hashmi, Murtaza

doi:10.1109/jsen.2012.2227712

Cited by 86 publications

(56 citation statements)

References 14 publications

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“…Table 2 represents the measured electrical parameters of the Rogowski coil head. The details of the parameters measuring methodology has been described by the authors in [14]. The lumped parameters (RLC) equivalent electrical model is shown in Figure 4.…”

Section: Physical and Electrical Model Of The Coil Headmentioning

confidence: 99%

Design, Implementation and Simulation of Non-Intrusive Sensor for On-Line Condition Monitoring of MV Electrical Components

Shafiq¹,

Lehtonen²,

Kütt³

et al. 2014

ENG

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Non-intrusive measurement technology is of great interest for the electrical utilities in order to avoid an interruption in the normal operation of the supply network during diagnostics measurements and inspections. Inductively coupled electromagnetic sensing provides a possibility of non-intrusive measurements for online condition monitoring of the electrical components in a Medium Voltage (MV) distribution network. This is accomplished by employing Partial Discharge (PD) activity monitoring, one of the successful methods to assess the working condition of MV components but often requires specialized equipment for carrying out the measurements. In this paper, Rogowski coil sensor is presented as a robust solution for non-intrusive measurements of PD signals. A high frequency prototype of Rogowski coil is designed in the laboratory.Step-by-step approach of constructing the sensor system is presented and performance of its components (coil head, damping component, integrator and data acquisition system) is evaluated using practical and simulated environments. Alternative Transient Program-Electromagnetic Transient Program (ATP-EMTP) is used to analyze the designed model of the Rogowski coil. Real and simulated models of the coil are used to investigate the behavior of Rogowski coil sensor at its different stages of development from a transducer coil to a complete measuring device. Both models are compared to evaluate their accuracy for PD applications. Due to simple design, flexible hardware, and low cost of Rogowski coil, it can be considered as an efficient current measuring device for integrated monitoring applications where a large number of sensors are required to develop an automated online condition monitoring system for a distribution network.

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Section: Physical and Electrical Model Of The Coil Headmentioning

confidence: 99%

Design, Implementation and Simulation of Non-Intrusive Sensor for On-Line Condition Monitoring of MV Electrical Components

Shafiq¹,

Lehtonen²,

Kütt³

et al. 2014

ENG

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“…6. This represents an active component, for example an active amplifier [8] or analog-to-digital converter [15] that provides very small loading for the circuit and decouples the sensor circuit from the rest of the data processing system. It can be assumed that the input resistance of an active unit reaches very high values (mega-ohms) and therefore has not been represented as a separate resistive component.…”

Section: High-frequency Sensor Characteristics and Connection To mentioning

confidence: 99%

“…In order to restore the original measured current waveform, the output would have to be integrated to cancel out the differentiating effect [15] Undamped resonant mode Critically damped mode Overdamped mode…”

Section: Sensor Output Signal Processingmentioning

confidence: 99%

Air-Core Sensors Operation Modes for Partial Discharge Detection and On-line Diagnostics in Medium Voltage Networks

Kütt¹,

Shafiq²,

Lehtonen³

et al. 2013

Electrical, Control and Communication Engineering

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-In this paper, sensors for the application of high voltage networks insulation diagnostics are focused on. For detection and localization of the components with insulation deterioration, observing the partial discharge transients is one of the main methods. However, as the partial discharge traces are transients of extremely short duration, monitoring of such transients is also a challenging task. This paper presents the inductive sensors that would be suitable for the on-line partial discharge monitoring and the selection of operating mode and characteristics are discussed. The issues of resonance and signal processing are analyzed for the targets of reaching highest accuracy of the measurements. Operation criteria and performance limits such as sensitivity and upper bandwidth are particularly discussed. It is presented that in order to reach highest accuracy and sensitivity the sensor should be used in damped mode. Applying the accurate air-core inductive sensors would allow the condition monitoring systems to be cheaper and thus mounted for permanent and continuous condition monitoring in various locations in the power distribution networks.

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“…Also, HFCTs have good sensitivity and wide bandwidth making them ideal for remote monitoring [4]. When designing an inductive sensor, such as an HFCT, it is common to use equivalent circuits [5] or simplified models [6] to optimize its parameters. The aim of the study described here is to determine the suitability of Finite Element Analysis (FEA) in investigating the performance of a HFCT sensor.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a High-Frequency Current Transformer Sensor for Partial Discharge Detection Using Finite-Element Analysis

et al. 2016

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Abstract-High Frequency Current Transformer (HFCT) sensors are widely used for Partial Discharge detection due to their versatility, high sensitivity and wide bandwidth. This paper reports on a Finite Element Analysis (FEA) methodology that can be employed to optimize HFCT performance. The FEA model consists of accurate 3D representations of the sensor components. Two different FEA software modules were used in order to cover the wide operating frequency range of the sensor. The simulation computes the frequency response of the sensor in the range 0.3 MHz -50 MHz for various HFCT geometric and material parameters, specifically the number of winding turns, spacer thickness, aperture size and core material. A prototype HFCT was constructed and the measured response compared with that of the simulation. The shapes of the responses were similar, with the simulated sensitivity being higher than the measured sensitivity by 1 dB on average. The measured low frequency cutoff of the sensor was found to be only 0.05 MHz lower than that of the simulation.

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Parameters Identification and Modeling of High-Frequency Current Transducer for Partial Discharge Measurements

Cited by 86 publications

References 14 publications

Design, Implementation and Simulation of Non-Intrusive Sensor for On-Line Condition Monitoring of MV Electrical Components

Design, Implementation and Simulation of Non-Intrusive Sensor for On-Line Condition Monitoring of MV Electrical Components

Air-Core Sensors Operation Modes for Partial Discharge Detection and On-line Diagnostics in Medium Voltage Networks

Optimization of a High-Frequency Current Transformer Sensor for Partial Discharge Detection Using Finite-Element Analysis

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