Wireless Rogowski coil sensor based on partial discharge detection signal for on-line condition monitoring in the medium voltage power cables
Partial discharge (PD) measurement provide a valuable information for assessing the insulation health in high voltage (HV) power system. In this research, a novel wireless Rogowski coil (RC) sensor based on PD detection in the medium voltage (MV) power cables is presented. This research is divided...
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| Format: | Thesis |
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| Language: | English |
| Subjects: | |
| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78043/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78043/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78043/3/Moh%20Nur%20Khairul.pdf |
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| Summary: | Partial discharge (PD) measurement provide a valuable information for assessing the insulation health in high voltage (HV) power system. In this research, a novel wireless Rogowski coil (RC) sensor based on PD detection in the medium voltage (MV) power
cables is presented. This research is divided into three sections which are RC sensor development, pre-filtering technique and wireless integration. A series of investigations on sensitivity and bandwidth for four types of RC sensors was demonstrated. The
prototype development first was carried out with the assistance of SolidWorks 3 dimension (3D) computer aided design (CAD) software and MakerBot 2X 3D printer. Subsequently, the sensors were modeled and simulated using Electromagnetic Transient
Program-Alternative Transient Program (EMTP-ATP) software environment based on
the lumped parameter identification. A single-end measuring technique was used as an
on-line PD monitoring system on the three-phase medium voltage underground cross-link
polyethylene (XLPE) insulated power cable with a 240 mm2 nominal area copper
conductor. In order to verify the simulation results, an experimental measurement was
carried out. This experiment was repeated concurrently for each design of the RC sensors
and the precise selection for the best sensor is paramount. In this case, the results indicated
that rectangular geometrical shape performed better with regard to the detection of the
PD signal. The rectangular shapes of RC sensor has been selected in order to compare
with the conventional RC sensor. Double-end technique measurement has been used
where two of RC sensor is placed on the certain distance to analyse the propagation
velocity and arrival time of PD signal captured by the sensor based on the different size
of XPLE power cables. The analysis on accuracy of double-end and multi-end PD
location technique have been conducted. The results between double-end and multi-end
technique have 0.138 % and 0.026 % percentage error of PD location respectively. An
experiment has been conducted in order to evaluate the effect of unshielded, shielded RC
sensor and terminating resistance, . The is a part of parameter which can improve
the performance of RC sensor. An operational amplifier (op-amp) and active Butterworth
high-pass filter which has been designed using Sallen-key topology that is used to amplify
and suppress the noise of output signal from RC sensor in the second section. The
integration of RC sensor into wireless communication system has been discussed in the
final section. High speed analog to digital converter (ADC) device is required to sample
the PD signal due. However, the conventional ADC in the market is expensive in high
speed rate. Thus, Sigma-Delta (ΣΔ) ADC topology is developed in Altera DE0-Nano
board. Peak detection with threshold technique is introduced in this section. Then, the
data transmitted wirelessly to the server unit using radio frequency (RF) module as a
transceiver and Altera DE2-115 board is used as a server unit. In order to achieve the
accurate digital sampling of high frequency PD signal, the N-bit resolution is paramount.
The finding of this analysis, 4-bit resolution is selected in this research as the best
resolution for the ΣΔ ADC to sampling the PD signal. |
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