Study on the Parameters Affecting the Impedance Extraction Accuracy by Inductive Coupling Method

Narayanan, Arun Shankar; Chua, Eng Kee; Weerasinghe, Arjuna; See, Kye Yak; Junitra, Kennard; Koh, Boon Kai

doi:10.1109/icirt.2018.8641624

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…Taking into consideration the significance of the online impedance of electrical assets, the extraction of online impedance is now a notable process, thus, a few methods to extract the online impedance will be comprehensively examined with its integrity and limitations highlighted. The extraction methods can be categorized into three types, that is the voltage-current measurement method [8][9][10][11][12][13], capacitive coupling method [14][15][16] and lastly, the inductive coupling method [17][18][19][20][21][22].…”

Section: Section II Literature Review Of Online Impedance Measurementmentioning

confidence: 99%

Two-Probe Setup with Improved Calibration for Online Impedance Measurement of Electrical Assets

Chou¹

2021

Preprint

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The online impedance serves as one of the most crucial specification to evaluate the health status and efficiency of an electrical device or system. The inductive coupling technique is a preferred approach to measure the online impedance due to the ease of implementation of the circuit which has zero physical contact to the live electrical system. The existing inductive coupling method deployed to measure the online impedance of an electrical device under test (DUT) adopts two probes in total: an injecting inductive probe (IIP) and a receiving inductive probe (RIP). An open/short/load (OSL) calibration procedure is implemented to eradicate the ramifications of the probe-to-probe coupling, however, based on the assumption that the calibration criterions (shorted, open and 50Ω) are approximated to their theoretical values in a specified frequency range. Hence, any measurement with frequency outside the specified range (i.e. larger than 1 MHz) will not be accurate due to the frequency-dependent residual inductances and capacitances of the calibration model. To overcome the aforesaid limitation, this paper introduces an improved calibration procedure which is applicable for a wider frequency range which takes the frequency-dependent characteristics into consideration. With the two-probe measurement setup (TPMS), the adopted improved calibration procedure is introduced to eradicate the ramifications of the probe-to-probe coupling with the intention to refine the accuracy of the extracted online impedance.<a></a>

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Section: Section II Literature Review Of Online Impedance Measurementmentioning

confidence: 99%

Two-Probe Setup with Improved Calibration for Online Impedance Measurement of Electrical Assets

Chou¹

2021

Preprint

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“…For this paper, a non-intrusive impedance extraction online method that is based on the inductive coupling approach [4][5][6][7], is used for detecting insulation fault within the stator winding of the induction motor. A known signal generated is input into the induction motor and monitored simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Motor Stator Winding Condition Monitoring

Joey¹

2021

Preprint

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The induction motor is considered the workhorse of the industry as it is used in most of the engineering applications. It is essential to ensure a safe and reliable operation of the induction motor in every system. Among the various types of induction motor faults, stator winding insulation fault accounts for a high percentage of it. As such, being able to detect early stages of insulation faults within the equipment using the method proposed in this paper would prove to be useful in providing timely maintenance. The proposed method in this paper is the non-intrusive impedance extraction method for online stator winding fault detection of induction motor. By observing the health condition of the motor in relation with its impedance, early stages of faults can be detected and rectified. Hence, eliminating potential safety hazards, reducing motor downtime as well as lowering the cost of maintenance. Experimental results shown will prove the reliability and accuracy in which the method proposed would provide. At the same time, its installation and removal are less complicated as compared to other methods hence is cost and time efficient.

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“…Due to the clamp-on type design of the inductive probe, a splitmagnetic core is adopted, and it is prone to magnetic flux leakage, especially when the split gaps of both probes are aligned. If the probe-to-probe coupling is not well-taken care of in the measurement setup, significant errors in the impedance measurement can occur [39]. The comparison shows that the measured in-circuit impedance with 𝑑 = cm deviates significantly due to the strong probe-to-probe coupling.…”

Section: Probe-to-probe Coupling In Tpsmentioning

confidence: 99%

“…Despite the above-mentioned refinements and improvements of the TPS, its major issue is the undesirable probe-to-probe coupling when the two probes are physically placed very close to each other due to space constraints in some practical situations, which can compromise the measurement accuracy [39]. Although a calibration and compensation method has been developed to correct the errors due to the probe-to-probe coupling, it can be a tedious process and havemustrepeated every time if the types of probes and spacing between probes change [40].…”

Section: List Of Tablesmentioning

confidence: 99%

“…Therefore, the probeto-probe coupling becomes negligible and can be ignored. A comprehensive analysis of the impact of the probe-to-probe coupling has been reported and will not be repeated here [39]. Although an error correction method has been developed to compensate for the error the process can be tedious and cumbersome [40].…”

Section: Probe-to-probe Coupling In Tpsmentioning

confidence: 99%

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Single probe in-circuit impedance extraction based on inductive coupling approach

Weerasinghe¹

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The in-circuit impedance of a critical electrical system provides valuable information on its operating status and health. There are three common in-circuit impedance measurement approaches, namely the voltage-current (V-I) measurement approach, the capacitive coupling approach, and the inductive coupling approach. Among them, the inductive coupling approach does not require a direct electrical contact to the energized system-under-test (SUT) and therefore greatly simplifies the implementation without the need to shut down the system and eliminates the concern of electrical safety hazards.The conventional measurement setup of the inductive coupling approach requires two inductive probes and a two-port vector network analyzer (VNA) or a signal generation and data acquisition system (SGAS). This well-established two-probe setup (TPS) has been refined and improved over the years. Despite all these recent improvements, it still cannot eliminate the inherent probe-to-probe coupling which compromises the measurement accuracy when the two probes are placed very close to each other. This thesis develops an in-circuit impedance measurement setup with the use of only one inductive probe and it is experimentally verified. By introducing a single-probe setup (SPS), not only reduces the hardware overhead of the measurement setup but also fundamentally addresses the concern of probe-to-probe coupling. In addition, the proposed SPS incorporates power amplification and protection devices to maintain the measurement system's accuracy and improve the ruggedness for in-circuit impedance measurement of electrical systems in harsh electromagnetic environments with the presence of strong background noise and transient events. An error correction scheme has also been developed to recover measurement

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Study on the Parameters Affecting the Impedance Extraction Accuracy by Inductive Coupling Method

Cited by 7 publications

References 4 publications

Two-Probe Setup with Improved Calibration for Online Impedance Measurement of Electrical Assets

Two-Probe Setup with Improved Calibration for Online Impedance Measurement of Electrical Assets

Motor Stator Winding Condition Monitoring

Single probe in-circuit impedance extraction based on inductive coupling approach

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