Test Method for Resistive Current of Arrester for Cable Line Based on Phase Search

2013 ◽  
Vol 860-863 ◽  
pp. 1977-1981
Author(s):  
Dan Pang ◽  
Zhen Hao Wang ◽  
Xiao Juan Han ◽  
Xi Lin Zhang ◽  
Chao Bin Wang
Keyword(s):  
Reference Signal ◽  
Phase Correction ◽  
Test Method ◽  
Total Current ◽  
Cable Line ◽  
Monitoring Method ◽  
Voltage Signal ◽  
Capacitive Component ◽  
Total Leakage ◽  
Resistive Component

Resistive monitoring method for conventional arrester is not applicable to cable line and it is also not easy to get access to voltage signal. In this thesis, a new method for testing resistive current is adopted, in which the only job is to collect the total leakage current of arrester, simulate a reference signal based on total current information, conduct phase shift to realize phase correction and find out the phase of capacitive component and resistive component, and thus the test on resistive current of arrester for cable line is completed.

Model-Based Testing of Embedded Systems Exemplified for the Automotive Domain

2010 ◽  
pp. 377-413 ◽  
Author(s):  
Justyna Zander ◽  
Ina Schieferdecker
Keyword(s):  
Embedded Systems ◽  
Embedded System ◽  
Reference Signal ◽  
Test Methods ◽  
Domain Model ◽  
Test Method ◽  
Model Based ◽  
Test Models ◽  
Black Box Testing ◽  
Weak Points

The purpose of this chapter is to introduce the test methods applied for embedded systems addressing selected problems in the automotive domain. Model-based test approaches are reviewed and categorized. Weak points are identified and a novel test method is proposed. It is called model-in-the-loop for embedded system test (MiLEST) and is realized in MATLAB®/Simulink®/Stateflow® environment. Its main contribution refers to functional black-box testing based on the system and test models. It is contrasted with the test methods currently applied in the industry that form dedicated solutions, usually specialized in a concrete testing context. The developed signal-feature-oriented paradigm developed herewith allows the abstract description of signals and their properties. It addresses the problem of missing reference signal flows and allows for a systematic and automatic test data selection. Processing of both discrete and continuous signals is possible, so that the hybrid behavior of embedded systems can be handled.

Design and Implementation of Digital Piezoelectric Constant Testing System

2014 ◽  
Vol 668-669 ◽  
pp. 911-915
Author(s):  
Bi Zheng Dong ◽  
Deng Hua Li
Keyword(s):  
Test Method ◽  
Piezoelectric Constant ◽  
Testing System ◽  
Charge Amplifier ◽  
Design And Implementation ◽  
Digital Pressure ◽  
Voltage Signal ◽  
Pressure Transmitter ◽  
The Difference ◽  
Mean Filtering

Digital piezoelectric constant testing system was designed in this paper, which was based on hydrostatic test method. The system is composed of hydrostatic device, charge amplifier circuit, peak holding circuit, A/D calibration circuit, data processing by DSP. Pressure-release value is obtained by digital pressure transmitter on the hydrostatic device. Combining with mean filtering and A/D calibration, DSP can sample accurate voltage signal. Considering the difference between the equivalent circuit of charge amplifier and its practical circuit, the calculated hydrostatic piezoelectric constant is in better agreement with the theoretical value. The experiment results show that the accuracy of testing system is less than 4%.

Research on Durability Test Method for Wheel Bearings

2012 ◽  
Vol 562-564 ◽  
pp. 803-807
Author(s):  
Hong Wu You ◽  
Ze Yu Weng ◽  
Di Jiang Yin ◽  
Bo Lu
Keyword(s):  
Test Methods ◽  
Test Method ◽  
Center Line ◽  
Determination Method ◽  
Durability Test ◽  
Monitoring Method ◽  
Simple Method ◽  
Outer Circle ◽  
Inner Circle ◽  
Wheel Bearing

The paper discusses durability test methods for wheel bearings. Through studying on the offset between the center line of a wheel and the center line on which the tire is forced, we get the determination method for the simulating load position on the wheel bearing . Depending on the influence study of inner circle or outer circle rotating method to the life performance of the wheel bearings, we give the test method on the bench. Based on the discussing of the bench monitoring method of wheel bearings, we give the effective and simple method to determine the failure of wheel bearings with Kur tosis.

scholarly journals Analisis Performansi Jaringan 4G Operator Telkomsel di Kota Tanjungpinang menggunakan Metode Drive Test

2020 ◽  
Vol 9 (1) ◽  
pp. 1-7
Author(s):  
Fitri Farida ◽  
Anton Hekso Yunianto
Keyword(s):  
Network Performance ◽  
Reference Signal ◽  
Test Method ◽  
Service Users ◽  
4G Networks ◽  
Optimal Observation ◽  
Test Technology ◽  
Test Route ◽  
Network Quality

The existence of a 4G network in Tanjungpinang City has begun to be felt by the community. The number of 4G service users continues to increase, so optimal observation is needed on the quality of the 4G network. Analysis of 4G network performance can be obtained using the drive test method. This method is used to obtain network quality information in real terms in the field. In line with advances in drive test technology, it can be applied more easily, namely using G-NetTrack Pro software. The parameters measured to determine the quality of 4G networks in this study are SINR (Signal to Interference Noice Ratio), RSRP (Reference Signal Receives Power), RSRQ (Reference Signal Receives Quality). Location of the measurement in Tanjungpinang City with the drive test route is started from Ali Haji street– Basuki Rahmat street – Wiratno street  - Sekarno Hatta street - Yos Sudarso street - Usman Harun street - POS street - Bakar Batu street - Brigjen Katamso street - MT Haryono street. The result shows 4G Telkomsel has a good quality with value RSRP -83.48 dBm, RSRQ -11.18 dB, SINR 6.71 dB.

scholarly journals Development of an online monitoring method for electrostatic precipitators on commercial biomass combustion plants

2019 ◽  
Author(s):  
Bastian Alt ◽  
Daniel Klüh ◽  
Matthias Gaderer
Keyword(s):  
Particulate Matter ◽  
Separation Efficiency ◽  
Reference Signal ◽  
Biomass Combustion ◽  
Monitoring Method ◽  
Secondary Precipitation ◽  
Measured Efficiency ◽  
Electrostatic Precipitators ◽  
Emission Limits ◽  
Suitable Reference

AbstractCombustion plants based on wooden biomass as fuel can contribute to a decarbonization of the energy sector by reducing the need for fossil energy usage, which decreases the net carbon dioxide output in the atmosphere. However, the flue gas of biomass-based combustion plants contains increased amounts of particulate matter, which need to be separated before release into the environment because of legal emission limits. In medium-sized plants, electrostatic precipitators (ESP) are commonly used separators to minimize the particulate matter concentration. Due to new regulations based on the medium combustion plants directive introduced by the EU, continuous surveillance of secondary precipitation technologies like ESP has to be implemented. The method proposed in this paper focuses on the readily available current (I) and voltage (U) data of the high-voltage unit supply of an ESP to calculate the efficiency of the particle separation. Consequently, a continuous proof of function can be delivered without high cost for additional measurement equipment. This article proves the effectiveness of the method in calculating the precipitation effectiveness of the ESP. It is shown that the deviation from the separation efficiency calculated by the method and the measured efficiency is smaller than 7%. Additionally, it is necessary to define a suitable reference signal that indicates whether the combustion plant is running or not. Hence, the availability of the system can be evaluated. This method will help operators to meet legal requirements.

Study of Characteristics of Partial Discharge for Assessment of Condition of Electrical Insulating Materials of Power Supply System

2013 ◽  
Vol 459 ◽  
pp. 70-75 ◽  
Author(s):  
Nikolay K. Poluyanovich ◽  
Marina N. Dubyago
Keyword(s):  
Continuous Monitoring ◽  
Power Supply System ◽  
Test Method ◽  
Electrical Insulation ◽  
Cable Line ◽  
Preventive Methods ◽  
Non Destructive ◽  
Insulation Condition ◽  
Electrical Insulation Condition

Maintenance of electrical leads to a deterioration of the dielectric properties of high-voltage isolation and failure, so the role of preventive methods of monitoring of electrical insulation condition increases.To determine the remaining life of the cable and effectively determine the location of damage to the cable line (CL) on the need to use non-destructive test method. Relevance of the work is to develop a method for the continuous monitoring of electrical insulation with sufficient technical and economic efficiency. The purpose of the investigation is to improve the reliability of the electrical insulation of power equipment.

scholarly journals Circuit-based method for extracting the resistive leakage current of metal oxide surge arrester

2020 ◽  
Vol 9 (6) ◽  
pp. 2213-2221 ◽  
Author(s):  
Amir Hesam Khavari ◽  
Abdullah Munir ◽  
Zulkurnain Abdul- Malek
Keyword(s):  
Metal Oxide ◽  
Leakage Current ◽  
Extraction Method ◽  
Maximum Error ◽  
Condition Assessment ◽  
Experimental Results ◽  
Equivalent Model ◽  
Surge Arresters ◽  
Total Leakage ◽  
Resistive Component

Resistive leakage current based condition assessment of metal oxide surge arrester (MOSA) is one of the most extensively employed technique to monitor its degradation. An extraction method is customarily required to extract the resistive component from the total leakage current. The existing methods to extract the resistive current are complex and less accurate. Therefore, this paper describes a simple and accurate circuit-based method to extract the resistive current using equivalent model and measured leakage current of the arrester. The accuracy of the proposed method is validated through experimental results on ABB’s 120 kV surge arrester, EMTP and QuickField software simulations. The performance of the method is also analyzed and verified experimentally on 72, 180 and 240 kV rated ABB’s surge arresters. The obtained results of resistive leakage current have shown the maximum error of 0.001%. Simple and easier computational steps with higher accuracy are the key benefits of the proposed technique.

Detection and Evaluation of Localized Damage under Creep-Fatigue Loading at 1000°F Using Acoustic Emission Technique

2006 ◽  
Vol 110 ◽  
pp. 45-54
Author(s):  
Kwang Hwan Oh ◽  
Jun Ho Jang ◽  
C.K. Jung ◽  
Kyung Seop Han
Keyword(s):  
Acoustic Emission ◽  
Fatigue Loading ◽  
Transient Behavior ◽  
Test Method ◽  
Full Time ◽  
Monitoring Method ◽  
Emission Parameter ◽  
Creep Fatigue ◽  
Cycle Dependent ◽  
Localized Damage

Acoustic emission (AE) technique was applied as a non-destructive test method to detect and evaluate the localized damage at high temperature environment. The creep-fatigue crack growth tests were carried out with the acquisition of AE signal at 1000°F. Under trapezoidal waveform loadings, AE results showed different features according to each damage mode. During the creep period, low and steady emissions were shown, while emissions were burst and high counts rate was recorded during the fatigue loading. Based on these characteristics, damage contribution was expressed in terms of acoustic emission parameter as a part-time monitoring method. Comparisons of damage contribution with respect to lifetime showed the transient behavior from cycle-dependent to time-dependent process. In case of full-time monitoring, bilinear behavior between AE counts and life was represented. From both monitoring results, it was confirmed that creep and fatigue damage can be characterized by means of emission features and AE is possible way to evaluate the localized damage at elevated temperature.

Sign in / Sign up

Export Citation Format

Share Document